Working projects with DE-6-09 boilers

1. Design Input

1. The working project for the reconstruction of the boiler room of the Zhuravskaya boiler house of the Svetlograd UDTG, Stavropol Territory was carried out on the basis of:

- JSC GAZPROM TU No. 13596 dated May 19, 2005 ;

- assignment of heat engineering and construction sectors.

Installation of gas pipelines of a message from pipes steel electrowelded straight-line-seam GOST1070580 * (group B) "Specifications" and GOST 1070491 "Ranges" and seamless hot-rolled GOST 873174 (group B) "Technical requirements" and GOST 873278 "Range" from steel B10 of GOST 105074 according to PB 1252903 "Safety rules of systems of gas distribution and gas consumption" and Construction Norms and Regulations 42012002 "Gas-distributing systems".

Internal gas supply

The boiler room gas supply system includes:

commercial gas metering unit;

unit accounting;

purge and discharge gas pipelines;

automation of the boiler room;

disconnecting devices;

protection of gas pipeline against corrosion.

Boiler room operation is provided with constant presence of maintenance personnel.

The boiler room is designed for heat supply and hot water supply to the Zhuravskaya boiler house of the Svetlograd UDTG. The gas pressure at the inlet to the boiler room is 783 mm hp. Art. (7.83 kPa);

3 boilers of type "E 1.6 0.9" with a nominal steam capacity of 1.6 tp/h are installed in the boiler room. The boiler is equipped with a burner of the type - "G1.3." Gas pressure upstream the burner: Pnom = 1.6 kPa. Gas flow rate per boiler is 135.0 m3/h (passport data). Gas flow rate per boiler room is 405.0 m3/h.

Prefabricated boilers with gas burner, ignition burner and safety automation.

The gas pressure (passport data) in the gas supply line shall be:

nominal - 470 mm HP Art. (4.7 kPa);

Gas meter SG16M 650 with measurement range 1:20 and VKG2 computer are installed in the boiler room for commercial accounting of gas flow rate.

The meter records gas flow rates:

32.5 m3/h to 650.0 m3/h (at P = 5.0 kPa) - table data;

from 34.55 m3/h to 691.0 m3/h (at P = 6.3 kPa) - operating conditions.

In front of the counter at a distance of at least 5 Dy, a filter of the "FN" type is installed, with a filtration degree of 50 μm for cleaning gas from mechanical impurities, according to the operating manual, to the SG meter LGFI.407221.001 RE.

After gas flow metering unit install safety relief valve "PSK50N/20." The valve setting for gas pressure actuation shall be 9.0 kPa.

Gas meter SG16M -250 with measuring range of 1:20 on the branch to each boiler is installed for unit-by-unit metering of gas flow to the boiler.

The ignition shall be carried out by specially trained personnel, according to the production instruction developed by the commissioning organization after the end of the mode commissioning operations.

Disconnecting device on gas pipeline is installed:

at the inlet to the boiler room;

at gas metering units;

on the branch to the boiler;

at blowdown and discharge gas pipelines;

in front of the burners.

Welded connection of pipes in gas pipelines in terms of their physical and mechanical properties and tightness shall correspond to the main metal of welded pipes.

Ventilation of the boiler room is natural, supply-and-supply, providing 3-fold air exchange per hour taking into account the air required for combustion (see Part II).

Pipes shall be tested by hydraulic pressure at the manufacturer or have a record in the certificate of assurance that the pipes will withstand hydraulic pressure, the value of which meets the requirements of the standards or specification for pipes.

The gas equipment and materials used in the project are certified for compliance with safety requirements and have permission from Gosgortekhnadzor for use. Item 2.1.4 PB 1252903.

Combustion products are discharged through chimneys (refer to section TM).

Gas pipeline protection

In-boiler gas pipelines and valves are protected against corrosion by coating consisting of primer layer FL03K as per GOST 910981 * and enamel layers KHV124 as per OST 1014489 *.

Protect the external gas pipeline from atmospheric corrosion with a yellow coating consisting of two layers of paint, lacquer or enamel intended for external work at the design ambient temperature in the construction area.

Seismic measures

Seismicity of the construction site is 8 points .

The thickness of the walls of the gas pipelines is selected taking into account the pressure in the gas pipeline, and seismic requirements. Temperature and seismic changes in the length of the gas pipeline are compensated by natural lowering, lifting and turning of the gas pipeline route.

Gas pipelines are introduced into the building through cases filled with elastic seal.

Lightning protection and grounding

Discharge and blowdown gas pipelines are located within the range of the fire protection of the boiler stack, in accordance with the "Instruction on lightning protection of buildings and structures" RD34.21.12284/Appendix 3/.

Gas pipelines: discharge and blowdown lines to be connected to the outer grounding circuit of boiler steel strip 25 × 4 mm .

All electrical installation works shall be performed in accordance with VSN33274, PUE, PTE and PTB.

Environmental protection measures

from pollution by emissions into the atmosphere

When burning natural gas, there is no sulfur anhydride and solid particles (soot, dust) in the combustion products.

Short-term gas discharge through the safety discharge valve into the atmosphere is possible only in case of incorrect operation of the boiler room gas supply system. There is no harmful effect on the environment.

Localization and emergency management

7.1. To localize and eliminate emergency situations in gas farms of urban and rural settlements, unified emergency dispatch services (ADS) with the city telephone "04" and their branches with round-the-clock work, including weekends and holidays, should be created at gas distribution organizations.

It is allowed to create specialized ADS in the subdivisions serving GRP (GRU), as well as industrial facilities and boiler houses.

7.2. The number and material and technical equipment of ADF (branches) are determined by standard standards.

Their locations are determined by the service area and the scope of work, taking into account ensuring the arrival of the ADF brigade to the accident site in 40 minutes.

In case of notification of explosion, fire, gas contamination of the premises, the emergency team must leave within 5 minutes.

7.3. According to emergency requests of organizations with their own gas service, ADF of gas distribution organizations should provide practical and methodological assistance in localizing and eliminating emergency situations under the contract and the agreed interaction plan.

7.4. The activities of emergency teams for localization and elimination of accidents are determined by the plan of interaction of services of various departments, which should be developed taking into account local conditions.

Plans for the interaction of services of various departments should be agreed with the territorial bodies of the State Gortekhnadzor of Russia and approved in the established manner.

The technical head of the organization - the owner of the hazardous production facility - is responsible for drawing up plans, approving, timely making of additions and changes to them, revision (at least once every 3 years).

7.5. Training sessions with assessment of personnel actions should be conducted in ADF:

according to plans of localization and accident elimination (for each crew) at least 1 time in 6 months;

according to the plans of interaction of services of various purposes - at least 1 times a year.

Training sessions should be carried out at landfills (workplaces) in conditions that are as close as possible to real ones.

Training sessions must be recorded in a special journal.

7.6. All applications to the ADF shall be recorded with the time of its arrival, the time of departure and arrival to the emergency brigade site, the nature of the damage and the list of work performed.

Applications to ADF shall be recorded on magnetic tape. Records shall be stored for at least 10 days.

It is allowed to register and process incoming emergency requests on a personal computer, provided that the received information is daily archived from the hard disk to other media (diskettes, etc.).

Timely execution of emergency requests and scope of work shall be controlled by the heads of the gas distribution organization.

Requests received should be reviewed on a monthly basis.

7.7. When receiving an application for the presence of a gas smell, the dispatcher must instruct the applicant about safety measures.

7.8. The emergency crew must travel in a special vehicle equipped with a radio station, a siren, a flashing beacon and equipped with tools, materials, monitoring devices, equipment and devices for the timely elimination of accidents.

When leaving the application to eliminate accidents on external gas pipelines, the ADF team must have as-built documentation or tablets (roadmaps).

7.9. The responsibility for timely arrival of the emergency team at the accident site and performance of works in accordance with the accident localization and elimination plan lies with its manager.

7.10. If a volume fraction of gas is detected in basements, tunnels, headers, entrances, premises of the first floors of buildings, more than 1% of gas pipelines must be disconnected from the gas supply system and measures taken to evacuate people from the hazardous area.

7.11. Elimination of gas leakage (temporary) is allowed with the help of bandage, clamp or bandage from a bag with chamotte clay superimposed on the gas pipeline. This site should be monitored every day.

The duration of operation of the internal gas pipeline with a band, clamp or bandage from a bag with chamotte clay should not exceed one shift.

7.12. Damaged welded joints (breaks, cracks), as well as mechanical damage to the body of a steel pipe (holes, dents) must be repaired by tapping coils or installing petal couplings.

Welded joints with other defects (slag inclusions, non-rotors and pores above permissible standards), as well as cavities on the pipe body with a depth of more than 30% of the wall thickness can be strengthened by installing couplings with corrugations or petals with their subsequent pressing.

Automation

The project was carried out in accordance with SNI3576, RD12-341-00 and PB1252903.

Automation of the boiler house with 3 coppers of E1,60,9G of the using gaseous fuel, service equipment of the boiler house, a measuring complex of accounting of a consumption of gas of m of control of gas contamination is provided in the project

Package boiler

The E1,60.9G boiler is equipped with an automation system based on the SIEMENS controller, which performs the functions of regulating and protecting the boiler and stopping the supply of fuel to the boiler at:

- extinguishing the burner flare;

- reduction of gas pressure;

- increase of gas pressure;

- lowering the water level in the boiler drum;

- increase of water level in boiler drum;

- lowering of air pressure upstream the burner;

- increase of steam pressure at boiler outlet;

- reduction of rarefaction in the chimney;

- increase of concentration of carbon monoxide 100mg/m3 or natural gas 10% NCCP CH4;

- operation of protection circuits, including voltage disappearance.

The automation system provides for the regulation of the ratio of "gas air" with modulation of the boiler power from 40 to 100%.

Before the boiler ignition, the controller program provides for leak check of valve compartments

Gas content control

To monitor the content of carbon monoxide and natural gas in the boiler unit room, a CTG1 annunciator and one additional sensor for combustible gases are installed in the unit room of the measuring complex of natural gas flow metering.

The device is designed for continuous monitoring of carbon monoxide and natural gas content with trigger thresholds in accordance with RD1234100, PB12-529-03.

CTG1 detector has 2 carbon oxide alarm thresholds of 20mg/m3 for "Threshold 1" level and 100mg/m3 for "Threshold 2" level.

The annunciator has the following alarm types:

- continuous green light indicating normal operation;

- continuous red light indicating achievement of "Porog1" concentration;

- continuous red light indicating achievement of "Porog2" concentration;

- continuous red light and sound, indicating the achievement of the volumetric fraction of combustible gases of 10% NKPR.

Installation of the CTG1 device shall be carried out at a height of 150... 180 cm from the floor level and not closer than 2 m from open windows and places of supply air supply in the area of the boiler room operator's workplace. The alarm is a stationary device and consists of an electrochemical sensor for carbon monoxide, thermochemical sensors for natural gas and a signal processing device

STG1 sensor units for combustible gases are installed in the area of probable leakage of natural gas in the premises of boilers and measuring complex of natural gas, at a height of 10... 20 cm from the ceiling.

If the concentration of carbon monoxide increases to 100 mg/m3 and the "Threshold 2" signal is triggered, or if 10% of LFID is reached by combustible gas, the control signal from the device is supplied to the controller, from the controller to the electromagnetic valve installed at the inlet to the boiler room, closes it and stops the gas supply to the boiler room.

Auxiliary equipment

The boiler auxiliary equipment automation project of the boiler house is in accordance with SNiP II3576.

Control, control and alarm circuits are based on SIEMENS controller with analog and discrete outputs connected to controller.

The scheme provides for automatic regulation and control of:

- water temperature at the outlet of jet heaters;

- condensate temperatures after the evaporator cooler;

-water level in the deaerator;

-water level in condensate tank;

- actuation of standby source water pump in case of working water failure;

- switching on the standby condensate pump in case of failure of the operating one and disconnecting the pumps at low water level in the condensate tank;

To record steam parameters in the project, the TKT5 heat quantity calculator for measuring:

- temperatures in steam line from boilers;

- temperatures in the steam line for production;

- steam flow rate in steam line from boilers;

- steam flow rate in the steam line for production;

- steam pressure in the steam line from boilers;

- steam pressure in the steam line for production;

From the computer, data can be transmitted to the printer to obtain measurement results on paper, or the information can be taken to the storage console.

Devices and electrical equipment for alarm and control are installed on the board, which is installed in the room of the boiler room.

Ground the panel, instruments and electrical equipment, refer to PUE.

Measuring complex

The project envisages automation of the measuring complex for gas supply of three boilers E1,60.9G.

The measuring complex is equipped with a meter and instruments for measuring the temperature and pressure of the gas, as well as the pressure drop on the meter.

The complex is intended for measurement of temperature, pressure, pressure difference on the counter and gas volume in operating conditions and the scoping of gas given to standard conditions at control and account, including commercial, consumption of natural gas.

To measure the gas temperature, a TCM resistance thermal transducer is used, for measuring the gas pressure, an AIR20DI gauge pressure transmitter is used, for monitoring the clogging of the bearings of the counter, and an AIR20DD differential pressure converter.

All information from the sensors is output to the VKG2 gas quantity calculator, which provides the following basic service capabilities:

- displaying on the LCD display the values of the current gas parameters in the gas pipeline;

- display of average hourly and average daily gas parameters;

- archiving of average values of parameters up to 62 days;

-transmission of measured information for registration on external media.

In the project, the archive information is transferred to the storage console for subsequent transfer to the computer and then to the printer to obtain measurement results on paper. In addition, information can be transmitted to the dispatch office via a telephone line through a modem.

Impulse pipe wiring shall be laid with a slope of at least 1:12 towards the measuring pipeline.

AIR20DD differential pressure converter is installed on the filter to monitor clogging of the filter element with subsequent transmission of information to VKG2 computer.

Devices for displaying and transmitting parameters of the measuring system are installed in the board, which is installed in the room of the boiler room.

E Boiler Automation 1-9

The boiler control cabinet is designed on the basis of the LFL 1.635 burner controller manufactured by Landis & Staefa, which has permission to use No. RRS 036705 from the 28.08.2002 of Gosgortekhnadzor of Russia, and the controller based on the S7200 manufactured by SIEMENS

The development of the device was carried out taking into account GOST 2120497 GAS INDUSTRIAL BURNERS and the Decree of the State Gortekhnadzor of the Russian Federation dated 18.03.2003 No. 9 "On Approval of Safety Rules for Gas Distribution and Gas Consumption Systems," SNI3576 "Boiler Plants."

The cabinet with IP54 protection contains: circuit breakers, burner controller, boiler control controller, power supplies, intermediate relays, magnetic starters. On the door there are controls, alarms and a text display.

The boiler start-up cycle is carried out according to the developed program. Load control is performed in PID mode. The boiler water level is maintained in position mode. The scheme provides for the transfer of regulation to manual mode for the production of adjustment actions.

The boiler automation system ensures safe operation of the boiler and stops the gas supply for combustion in the following cases:

- power supply failure;

- emergency water level in the boiler + 55mm, 55mm;

- Flame extinguishing of the burner;

- burner air pressure is less than 0.4kPa;

- burner gas pressure is less than 0.4kPa;

- burner gas pressure is more than 1.8kPa;

- gas duct pressure is more than 0.2kPa;

- steam pressure is more than 0.8 mPa;

- fan failure;

- failure of the feed pump;

- failure of flame monitoring sensor;

- according to the emergency condition of the general parameters.

Setpoint parameters are specified during commissioning.

The start-up program provides for a pre-start leak test of the PZK.

1 Description of operation.

1.1. Switch Q1 supplies power to the boiler control circuit. At that HL1 comes ON. Manual control of fan (SB4), feed pump (SB5), shutter on air duct (SA1), shutter on gas (SA2) is possible. The valve on the gas duct opens at fan starting.

1.2. Start-up conditions.

1.2.1. Gas pre-start parameters shall correspond to the mode map.

1.2.2. The water level in the boiler shall be working.

1.2.3. Common-purpose parameters capable of starting (SHA signal ).

1.3. Start-up

1.3.1. Pressing SB1 button starts the starting program.

1.3.2. The start-up process is reflected on the text display:

"STOP gas" bolt. close - pre-start message;

START-UP

Pressure test 1;

Pressure testing 2;

Pressure test 3;

VENTILATION;

STOP VENTILATION;

7. BURNER START-UP;

Lights up: HL2 - igniter;

HL3 - burner.

8. OPERATION gas.

1.4. Stop

Pressing of SB2 button causes immediate adjustable stop:

- gas supply stops;

- the furnace is ventilated;

- shutter on the gas duct closes.

1.5. Emergency stop

Emergency stop at any deviation of monitored parameters beyond emergency setpoints. A message appears on the text display. "EMERGENCY" lamp (HL4) comes ON. "BURNER" lamp (HL3) goes OFF. An audio signal is sent. The audio signal is removed by pressing SB3 - "AUDIO SIGNAL REMOVAL" button. "EMERGENCY" lamp goes OFF. The alarm signal is removed by pressing SB2 - "STOP/REMOVE ACCIDENT" button.

During an emergency stop, one of the following messages appears on the display:

ACCIDENT Unit. Torches

ACCIDENT OPR1 Pmin No

ACCIDENT OPP3 Pmax No

ACCIDENT Water level max

ACCIDENT Water level min

ACCIDENT Pressure downstream boiler

ACCIDENT P air min

ACCIDENT Steam pressure max

ACCIDENT Davl.gaz max

ACCIDENT Davl. Gas min

ACCIDENT Vent. stop

ACCIDENT Shutdown Pump

ACCIDENT Zgase not closed

ACCIDENT ZDOM not closed

ACCIDENT No continued

Remote control and alarm

1.6.1. Permission to start-up and stop in all-boiler parameters occurs through short circuit of H21, H2-2

1.6.2. Short circuit of X23, X2-5 - a signal of work of a copper.

1.6.3. Short circuit of X24, X2-5 - a signal of accident of a copper.

1.6.4. During remote shutdown, the boiler controller executes a controlled shutdown program.

1.7. Commissioning works.

For commissioning works, it is provided to switch the control of the boiler mechanisms to manual mode after the start-up is completed at the request of the operator through the function keys of the display:

SA1 - air pressure;

SA2 is the gas pressure.

Description of boiler start-up program time intervals

Interval t0.

Voltage supply, pre-start state. It is possible for the operator to turn on the feed pump, fan and gate valve control on the gas line, gas duct. Display - "STOP GAS"

Interval t1.

Display - 1 START

When the "START" button is pressed, the gate valve on the gas duct opens, the smoke pump turns on. The interval time is determined by the stroke time of the actuator. The feed pump starts, at that the level indicator command execution is monitored. Manual control is terminated.

Interval t2:

Display - 2 TRIM 1

Interval time - 30 sec. Fan is switched on, UA4 safety valve is closed. Tightness check YA5 is underway. If gas leaks through YA5 (there is no tightness), the gas pressure will begin to grow behind it.

Display alarm - ALARM OPP.1

Interval t3:

Display - 3 TRIM 2.

Interval time - 5 sec. Opens, bypass YA7, pressure appears on the section of the gas pipeline between YA5 YA6.

Interval t4:

Display - 4 TRIM 3.

Interval time - 30 sec. YA7 bypass closes. Leak check of YA6 and safety valve YA4. When the gas pressure drops, the protection operates.

Display alarm - ALARM OPR.2

Interval t5:

Display - 5 VENTILATION.

Interval time is 550sec. Boiler ventilation. Fan operation is monitored.

Interval t6:

Display - 6 STOP VENTILATION.

Time of interval by stroke time of valve actuator on gas M2. The control of the gas-air ratio is turned on.

Interval t7:

Display - 7 BURNER START

The interval time is controlled by the burner controller. The safety valve is closed and the burner controller is switched on.

Interval t8:

Display - 8 OPERATION gas.

Actuation of combustion mode protections. Enable load control.

Interval t9: Display - STOP ventilation.

The interval is executed when a command or alarm stops.

Interval time 180 sec. After boiler stop ventilation. Boiler fan gate opens. If the boiler crumbles occurred before the spark was supplied, no ventilation is carried out. The fan stops when the time elapses. When stopped at the lower emergency level, the feed pump is turned off. All actuators are set to initial position - "Closed."

Interval t10:

Display - STOP gas is closed.

Time of shutter closing on the gas duct.

Note:

The duration of the intervals is finally set during adjustment. Protection setpoints, except for steam pressure, are entered programmatically. It is possible to switch to manual load control in the interval t8 on call through the function button of the display.

Input - output of information

Text display TD200, the appearance of which is shown in Fig.1. is used for input and output of information to the controller.

On the front panel of the text display there are 40 character (two lines of twenty characters) alphanumeric display and nine service buttons, which have the following purpose:

F1 (F5), F2 (F6), F3 (F7), F4 (F8) - function buttons;

SHIFT - expansion of function buttons;

ESC (failure) - Failure to change data or (depending on operation mode) change of system data (real time clock, etc.);

ENTER - Change and enter the current displayed data in the controller memory;

↑ - Message scrolling button (previous message) or (depending on operation mode) increase of current editable parameter value;

↓ - Message scrolling button (next message) or (depending on the mode of operation) decrease of the value of the current parameter to be edited.

Attention! By pressing one of action buttons F1 (F5), F2 (F6), F3 (F7), F4 (F8) works the corresponding F1, F2, F3, F4 button, and by simultaneous or consecutive pressing of the SHIFT button and one of the buttons F1 (F5), F2 (F6), F3 (F7), F4 (F8) works the F5, F6, F7, F8 button respectively.

Enter a password.

The system is protected against incorrect interference by a 4-bit digital password.

If you try to change a parameter, the system requires a password. The following message appears on the text display:

PASSWORD REQUIRED

(PASSWORD REQUIRED)

PASSWORD ****

(Password****)

The flickering cursor will be located on the first left character of the password. Use the ↑ and ↓ buttons to set the first required password digit and press Enter. The cursor moves to the next character location. You must enter the second, third, and fourth digits of the password.

If the password is entered incorrectly, the following warning is displayed on the text display:

INCORRECT PASSWORD

INVALID PASSWORD

PRESS ESC

PRESS ESC

You must press the ESC button and then repeat the password entry procedure. The correct password will allow you to change the required settings .

If there is no manipulation of the text display by the operator (none of the buttons was pressed) for more than one minute, if you try to change the parameters, you must re-enter the password. The password is set by the manufacturer, you cannot change the password yourself during work.

Changing Parameter Values

If you want to change the value of a parameter, you must use the scroll buttons ↑ and ↓ select the message that displays the corresponding parameter. Then press Enter. In this case, the text display goes into the mode of editing the parameter value, as a result of which a flickering cursor appears in the extreme right place of the value input field. You can then increase or decrease this value with the ↑ and ↓ buttons.

If necessary, you can reset the value of the parameter you are editing by pressing Shift + Enter at the same time.

To speed up the change of the value of the quantity being edited, you can move the cursor to the desired digit of the numeric value by pressing the Shift button and one of the ↑ or ↓ buttons simultaneously.

When you have finished editing the parameter value, press Enter. The set value will be recorded in the memory of the controller and will take part in the new calculations. This will return the controller to message display mode or move to the next edit field if there are multiple editable fields in a single message.

To not write the changed value to memory, press the ESC button, and the controller returns to message display mode.

Real-time clock corrections

To correct the real-time clock, you must enter the system data change mode. Entering system data mode occurs when the ESC button is pressed. The system will prompt you for an access password. The password entry procedure is detailed in paragraph 1.1. After entering the correct password, a menu is displayed in which, after 3 times pressing the ↓ button, the SET TIME AND DATE option is displayed. Then, after pressing the ENTR button, a message is displayed in which you can adjust the time value in the next sequence (day, month, year, hours, minutes, seconds, day of the week). At the beginning, the cursor is placed in the day field. The procedure for replacing the number is described in detail in paragraph 1.2. Then the cursor in the above sequence falls into the "month" field, then into the "year," etc. Press the ESC button to enter the initial state.

Note: the text display TD200 itself cannot store the current time, it can only read and write to the memory of the controller a new time value in the above way. The controller does not check if the entered time is correct, so for the correct mode of the object it is necessary to fill in all fields correctly. It is strictly forbidden to change the remaining items of the system data menu to prevent controller failure.

Purpose of the main function buttons of the text display:

F1 button - display of RDP regulator parameters (steam pressure regulator (load));

F2 button - display of RDV regulator parameters (regulator of gas-to-air ratio);

F3 button - display of additional parameters;

F4 button - setting to main readings mode;

Shift + F1 button - setting of time intervals of boiler ignition process;

Shift + F2 button - sets the values of parameters that affect the characteristics of the controls;

Shift + F3 button - sets additional parameters of boiler unit;

Shift + F4 button is reserved.

Mode of main readings - F4

In the initial state or when pressing the F4 button on the text display screen, the top line displays information about the current state of the boiler, and the top line in the right corner displays the time remaining until the end of the current time interval, in addition, the bottom line displays the current date and time. The boiler ignition and operation process consists of the following time intervals:

< < STOP gas > > - status before pressing START button

1 Start - after pressing the START button

2 Pressure test 1 - 1st mode of Pressure test

3 Pressure test 2 - 2nd mode of Pressure test

4 Pressure test 3 - 3rd mode of Pressure test

5 Ventilation - pre-purge mode

6 Stop Fan - closing of vent and fuel gate

7 Burner start-up - start-up of burner controller

< < OPERATION OF GAS > > - end of start-up program setting to operating mode

After Fan - subsequent ventilation, after pressing STOP button or after any emergency situation.

Display of PDP regulator parameters (steam pressure regulator (load)) - F1.

When pressing F1 button - parameters related to steam pressure regulator are displayed:

RDP Pressure steam * * * * Kpa

PP * A Set * * * * KPa

where, in the top line the value of steam pressure in KPA is displayed

RR - is set value of an operating mode of the regulator a 0-manual operating mode, 1-automatic. You can change the job value directly from here by pressing the ENTER button, and then follow the procedure for changing parameter values, which is detailed in paragraph 1.2. The letter following this number additionally allows to check the current operation mode of Manual, A-Automatic;

Set - value of steam pressure setting in KPA. You can change the job value directly from here by pressing the ENTER button, and then follow the procedure for changing parameter values, which is detailed in paragraph 1.2.

Display of RDV regulator parameters (gas-to-air ratio regulator) - F2.

When pressing F2 button - parameters related to air pressure regulator are displayed:

RDV G * * * * Pa V * * * * Pa

PP * A Set * * * * Pa

where, D - gas pressure in Pa;

In - air pressure in Pa;

RR - is set value of an operating mode of the regulator a 0-manual operating mode, 1-automatic. You can change the job value directly from here by pressing the ENTER button, and then follow the procedure for changing parameter values, which is detailed in paragraph 1.2. The letter following this number additionally allows to check the current operation mode of Manual, A-Automatic;

Assigned value of air pressure setting in Pa. The task value is automatically calculated in accordance with the mode map of the gas-air ratio. The procedure for setting the gas-air ratio parameters is described in detail in paragraph 1.11 and is set by the heat engineer.

Displays additional parameters - F3.

Pressing F3 button - additional boiler parameters are displayed:

Rgh * * * * Pa Rope * * * * Pa

Thx * * * * ° С

where, Rgx - pressure in gas duct in Pa;

Rope - gas pressure between valves in Pa;

Tgkh - temperature in the gas flue in °C;

Setting time intervals of boiler ignition process - Shift + F1.

Pressing the Shift and F1 buttons sequentially displays the time intervals of the ignition process and boiler operation. All listed parameters can be changed, the procedure for changing parameter values is described in detail in paragraph 1.2.

< < Start > > * * s

Pressurising1 * * s

Pressur2 * * s

Presser 3 * * s

Ventilation * * s

Stop valve. * * s

Burner start-up * * s

Post Vent. * * s

The timing of the ignition process is described in a further description.

Specifies Shift + F2 parameter values that affect the characteristics of the controls.

Pressing the Shift and F2 buttons sequentially displays the current parameters related to the characteristics of the controls. These parameters can be changed, therefore, the characteristics of the controllers can be changed, the procedure for changing the parameter values is described in detail in paragraph 1.2.

RDP Per.Pulse * *, * with RDP pulse period, in sec

RDP Coef.amplified * * * RDP gain

RDP Coef.integr * * * RDP integration ratio

RDP Dead zone * * * RDP dead zone, 0.1%

RDV Per.Pulse * *, * from period of RDV pulse, in sec

RDV Coef.amplified * * * RDV gain

RDV Coef.integr * * * RDV integration factor

RDV Dead zone * * * RDV dead zone, 0.1%

To change the properties of each regulator there are four parameters:

Control pulse period

Gain

Integration factor

Insensitivity zone

The period of the control pulse this parameter sets the duration of the period of the control pulses, i.e. the total pulse and pause time, is set with a discreteness of 0.1s and remains constant for the entire operation time of the controller.

The gain of this parameter indicates how sensitive the regulator is to the amount of mismatch and its rate of change, affects the duration of the pulse: if the gain is increased, the pulse time will increase, and pauses will decrease, if reduced, the pulse time will decrease, and pauses will increase.

The integration factor of this parameter determines how sensitive the regulator is to abrupt changes in the adjustable parameter.

The insensitivity zone determines deviation of the variable value from the setting within which the regulator will not generate control pulses.

By combining the values ​ ​ of the above parameters, it is possible to optimally adjust the characteristic of the regulator. Recommendations for setting up regulators are presented in Chapter 2.

Specify additional parameters for the boiler - Shift + F3.

Pressing the Shift and F3 buttons sequentially displays the remaining boiler parameters. These parameters can be changed, the procedure for changing parameter values is described in detail in paragraph 1.2.

Rgaz min Oda * * * * Pa - Gas pressure protection 1, Pa

Rgaz max Oda * * * * Pa - Gas Pressure Protection 2, Pa

Rgaz min Gore * * * * Pa - Minimum gas pressure, Pa

Rgaz max Gor * * * * Pa - Maximum gas pressure, Pa

Prvoz min An * * * * Pa - Air pressure protection minimum, Pa

Rpar max An * * * * kPa - Steam pressure protection maximum, kPa

Rgaz min An * * * * Pa - Gas pressure protection minimum, Pa

Rgaz max An * * * * Pa - Gas pressure protection maximum, Pa

Multigas *, * * * * - Multiplier for gas-air ratio formula

Syllable gas-to-air *, * * * * - Used for gas-to-air formula

Rgazokh min An * * * * Pa - Gas duct pressure protection minimum, Pa

In general, you can change the following boiler performance characteristics:

Gas pressure protection 1 in Pa, this parameter is used to check the tightness of the valve YA4 and in case of exceeding the permissible gas pressure downstream of the valve, in the second interval of the ignition process, the protection is triggered.

Gas pressure protection 2 in Pa, this parameter is used to check the tightness of valves YA6 and YA4 and when the allowable gas pressure decreases during the fourth interval of the ignition process, the protection is triggered.

The minimum gas pressure sets the minimum gas pressure in Pa below which the heat load control valve will not close.

The maximum gas pressure specifies the maximum gas pressure in Pa above which the heat load control valve will not open.

The minimum air pressure protection sets the minimum air pressure in Pa below which the minimum air pressure protection will be triggered.

The maximum steam pressure protection specifies the maximum steam pressure in kPa, above which the protection will be triggered by the parameter Steam pressure maximum.

The gas pressure protection minimum specifies the minimum gas pressure in Pa below which the gas pressure protection minimum will be triggered.

The gas pressure protection maximum specifies the maximum gas pressure in Pa, above which the protection will be triggered by the Gas pressure maximum parameter.

The pressure protection in the gas duct at minimum sets the minimum pressure in the gas duct at Pa, below which the protection operation will occur according to the parameter Pressure in the gas duct at minimum.

For operation of the gas-to-air ratio controller it is necessary to enter parameters Gas-to-air multiplier and Generated gas-to-air. To obtain these parameters, it is necessary to construct a gas-air curve. From this curve, you must select two points and enter in the formula

ALL PARAMETERS SPECIFIED IN THIS ITEM ARE SPECIFIED BY SPECIALISTS OF HEAT ENGINEERS, AND IT IS NOT RECOMMENDED TO CHANGE THEM DURING OPERATION.

Recommendations for setting up regulators:

The controller built-in controller operates as follows. Value of measured parameter Ti is compared with preset setpoint Tust, after which controller outputs control pulse

When the plant is turned on, significant overregulation is observed, and then a long low-attenuation fluctuation of the parameter around the setpoint .

Possible reasons:

is too high a gain. A long pulse is generated for a minor mismatch. As a result, the gate valve "slips" all the time past some medium, optimal position;

- integration factor is too small. If the mismatch rate is too high, the controller must generate braking pulses near the setpoint, i.e. start closing the gate valve even though the current parameter is still less than the setpoint. If this does not happen, it is necessary to increase the integration coefficient, which will also give a fading character to the fluctuations of the parameter around the setpoint and make the controller better respond to a sharp change in the object parameter;

- Pulse duration is too long. Too large a control step can cause an oscillating process. Fluctuations occur due to the fact that the controller too rarely calculates the duration of control pulses and due to this "slips" the optimal position of the gate valve or responds with a large delay to a change in the parameter of the object.

The object goes to the setpoint for a very long time or returns to the setpoint for a very long time after a smooth change in the parameter as a result of disturbance.

The reason for this is that the gain is too small. As a result, despite a significant mismatch, the duration of the control pulse is too short to compensate.

A sufficiently large integral component factor makes the controller sensitive to abrupt changes in the object parameter and leads to rapid

attenuation of parameter oscillations, however, if the integration coefficient is too large, the controller very much changes the duration and sometimes the polarity of the control pulses with the slightest change in the mismatch value. Therefore, when reaching the setpoint, the parameter does not grow smoothly, but with jerks. This especially becomes noticeable near the setpoint .

Optimal adjustment of coefficients allows you to bring the object to the setpoint as quickly as possible and almost without re-adjustment.

Features of correct selection of coefficients are smooth, without jerks of parameter growth presence of braking pulses at approach to setpoint both from below and from above.

If the object reaches the setpoint with a small overregulation and fast-attenuating oscillations, you can slightly reduce the gain, leaving all other parameters unchanged.