Gas supply of boiler house with Universal-6 boilers (medium pressure)

Contents

1. General part

2. Boiler house

3. Internal gas supply

4. Automation, Alarm

5. Automation of gas supply (internals)

6. Security and fire alarm

1.3 Project compliance with applicable codes and regulations

The technical solutions adopted in the working drawings comply with sanitary, hygienic, fire and other standards applicable in the territory of the Russian Federation and ensure safe operation of the facility for life and health of people, subject to the measures provided for in the working drawings.

This project package has been developed in accordance with applicable codes and regulations:

The project has been completed in accordance with the following regulatory documents:

- Federal Law of the Russian Federation of July 22, 2008 No. 123FZ "Technical Regulations on Fire Safety Requirements";

- Rules for arrangement and safe operation of steam boilers with steam pressure not more than 0.07 MPa (0.7 kGs/cm2), hot water boilers and water heaters with water heating temperature not more than 388 K (115 ° С);

- PB 125292003 "Safety Rules for Gas Distribution and Gas Distribution Systems";

- PUE "Electrical Installation Rules";

- NPB 10503 "Determination of categories of rooms, buildings and outdoor installations by explosion and fire hazard";

- SNiP 42012002 "Gas distribution systems" (updated version of SP 62.13330.2011);

- SNiP II3576 * "Boiler Plants" as amended. No. 1;

- SP 421012003 "General Provisions for Design and Construction

gas distribution systems made of metal and polyethylene pipes ";

- SNiP 3.05.0785 "Automation Systems";

- SNiP 230595 Natural and artificial lighting;

- SNiP 2.02.0183 "Foundations of buildings and structures";

- SNiP 2.01.0785 "Loads and Impacts";

- SP521012003 "Concrete and reinforced concrete structures without preliminary reinforcement stress";

- SNiP 41012003 "Heating, ventilation and air conditioning";

- SNiP 210197 * "Fire safety of buildings and structures";

- SP 4110195 "Design of Thermal Points";

- SNiP 41022003 "Heat Networks";

- SNiP 41012003 "Heating, ventilation, air conditioning";

- SNiP 3.05.0185 "Internal sanitary and technical systems";

- SNiP 2.04.0185 * "Internal water supply and sewerage of buildings";

- SNiP 2.04.0284 * "Water supply. External networks and structures ";

- SNiP 2.04.0385 "Sewerage. External networks and structures ";

- GOST 21.60884 Internal electric lighting;

- GOST 12.1.00491 "SSBT. Fire safety. General requirements. "

The used equipment and materials have certificates of compliance with the requirements of regulatory documents and permission to use the Federal Service for Environmental, Technological and Nuclear Supervision (Rostekhnadzor) of Russia

1.4 Technical and economic indicators

The project includes progressive technical solutions that save material and technical resources, thermal energy, energy resources, labor costs, namely:

use of modern high-quality equipment with optimized performance, as well as an efficient thermal circuit provides high heat transfer from heating surfaces and, therefore, operation with higher efficiency, which in turn reduces annual fuel consumption;

complex supply of equipment in the form of large units; water treatment plant - operates in automatic mode, without constant presence of maintenance personnel;

application of complex process automation systems ensures minimum costs for boiler house operation, energy and fuel and energy resources saving.

3. Internal gas supply

The project provides for the placement of internal gas equipment in the boiler house building. Boilers are located on elev. 0.000 by boiler front in one line. The level of boiler room floor is taken as elevation 0.000. The boiler room is fully automated, works without the constant presence of maintenance personnel. Control over the operation of the boiler house is carried out from the control room located in the boiler house building.

Cast iron section boilers "Universal - 6 M" are installed in the boiler room.

The project provides for the configuration of Universal-6 M boilers with IGK 135 injection gas burners with control automation. Burners are equipped with solenoid valve and regulator. Control of gas supply is performed by throttle gate valve with electric drive.

Gas connection pressure to the burner is 50.0 kPa. The maximum gas flow calculated from the operating conditions of the three boilers at rated capacity is 96.9 m3/h (at Qp n = 8000 kcal/m3). The minimum gas flow rate determined from the boiler operating conditions at minimum power is 12.92 m/h.

Heat intake valve KTZ 00150 Du50, ball valve KSH50f, then valve switch KZGEM-UI-50SD (set of automatic gas content control system SAKZMK32) are installed at the gas inlet to the boiler room. The control of the KZGEMUI50SD valve is exercised by means of the system of automatic control of gas contamination SAKZMK3 with signaling devices of CO and CH4.

The designed metering unit is installed on the medium pressure gas pipeline. Gas pressure at the inlet to the metering unit P = 0.1 MPa. Gas flow metering unit is equipped with:

- gas filter with FS50VO differential pressure indicator with DPA 16;

- measuring SGEKVzR0.5160/1.6 complex with the counter of a consumption of RVG G160 gas, the electronic proofreader of EC 270, the chipboard differential manometer - 80B PACKO with a limit of measurement of 1 kPa .

When assembling a gas metering unit, use a mounting insert (coil) instead of a counter. Install the counter, refer to PR 50.2.0192006.

To reduce the gas pressure in the boiler room there is a gas control station based on the gas regulator RDBK 150N.

Gas pipelines ∅ 57х3.5 are brought by diameter to torches from the general collector ∅108х4, L=6.25 m. On coppers blowing-off gas pipelines ∅20х2.5 are provided. The prefabricated common blowdown gas pipeline ∅25kh2,5 be brought 1 m above the roof.

The technical solutions adopted in the working drawings comply with sanitary, fire and other standards applicable in the territory of the Russian Federation and ensure safe operation of the facility for life and health of people, subject to the measures provided for in the working drawings.

The used gas equipment and materials have certificates of compliance with the requirements of regulatory documents and permission to use the Gosgortekhnadzor of Russia.

All gas pipeline connections shall be welded in accordance with GOST 1603780. Welding technology used for construction of this facility shall be certified.

The pipeline shall not be supported by welds on supports. Seams shall be accessible for inspection.

A portable ladder is provided to service the purge gas pipeline.

Butt joints of metal gas pipelines are subject to physical control in the amount of 5% (but not less than one joint) of the total number of joints welded by each welder at the facility.

Control of radiographic images of welded steel joints welded by each welder should be carried out at the hardware and software complex of automated decoding of radiographic images in the amount of 20%.

When assembling a gas pipeline, use a mounting insert (coil) instead of a counter. Install the counter, refer to LGTI.407221.007 RE, PR 50.2.0192006.

Ground the meter housing with copper wire with cross section not less than 1.5 mm2.

Install the gas content control system in accordance with the manufacturer's certificate.

The purge gas pipelines shall be 1 m above the roof of the building.

Gas pipelines shall be subjected to leak test in accordance with SNiP 42012002 "Gas distribution systems."

This design is made taking into account the use of electric welded pipes according to GOST 1070491 made of StZsp steel according to GOST 38094 and water and gas pipes according to GOST 326275 * made of StZsp steel according to GOST 38094.

After installation and testing, paint gas pipelines 2 times with oil paint in yellow color on two layers of primer GF021 GOST 2512982.

Operation of gas equipment is provided without permanent presence of maintenance personnel.

Maintenance of the boiler room shall be carried out by personnel with a permit for the operation of gas consuming plants. Control over the operation of gas-consuming plants should be carried out at least twice a shift.

3. automation, alarm

The boiler room is automated, operates under the control of maintenance personnel.

Three "Universal - 6 M" boilers with IGK 135 gas burners are subject to automation. This project has developed schemes for automation of boilers and auxiliary equipment, schemes for external wiring. The design takes into account materials for installation showing pressure and temperature instruments.

Power supply of the automation kit is taken into account in the electrical part of the project.

Each boiler operates under the control of burner control automation.

The boiler automation kit provides:

1. Automatic start-up and shutdown of the boiler.

2. The protection ensures that the gas supply to the burner is cut off in the following emergency situations:

- flame extinguishing of burners, reduction of gas pressure upstream the burner;

- control of water pressure in the boiler;

- in the gas duct of each boiler;

- power outage;

- faults of protection circuits;

In the boiler room, a 2-threshold digital automatic gas monitoring system SAKZMK3 is installed. SKS consists of CO, SN/4 sensors, signalling and control unit of LCS, GSM detector, PD control panel and shut-off gas valve. Cables for connection of sensors and shut-off valve are included in SAKZ delivery.

SAKZMK3 system is intended for control:

- states of boiler room emergency parameters sensors;

- states of process equipment accident sensors;

- The content of natural gas and carbon monoxide;

- fire and security alarm;

- system valve compartment states.

SAKZMK3 system provides:

- closing of gas supply pipeline by valve in emergency situation;

- output of sound and light signalling with storage of the accident cause and display of this information on LCS;

Maintenance accident includes:

- pump accident;

- boiler accident;

- AVO accident.

The gas valve is closed in case of reaching gas content of MV room/4 20% of LPG or at CO - 100mg/m3/, at opening of contacts of emergency parameter sensors (emergency water pressure sensor min/maxavarium 1, gas pressure in the supply gas line of the boiler room min accident 2) and at opening of contacts of fire alarm sensors.

Installation works shall be carried out by a specialized organization licensed to perform electrical installation works. When performing electrical installation works, compliance with the requirements of existing regulatory documents is mandatory.

4. automation of gas supply (internals)

The metering unit installed in the boiler room is subject to automation. The designed metering unit is installed on the low-pressure gas pipeline.

The project was carried out in accordance with PR 50.2.019 2006 "Procedure for measurement using turbine, rotary and vortex meters"

Maximum gas flow rate of gas-using equipment is 96.9 m/h. The minimum gas flow rate is 12.92 m/h.

To determine the pressure drop on the meter, a differential pressure gauge with a measurement limit of up to 5 bar is included with the corrector, equipped with a three-way valve. To determine the pressure drop on the filter, the IP5DL pressure drop indicator with a measurement limit of 5 kPa is used. in the filter delivery package.

The gas meter, pressure sensors and temperature sensor are installed on the medium pressure gas pipeline P = 0.1 MPa ∅57x3,5.

The EC270 corrector is installed on the wall in the boiler room in the area of ​ ​ the metering unit. It also houses the Functional Expansion Module for the EC270 (with BPEC03) MP 20, which serves to supply power to the corrector and switch (connection) of two devices with the RS232 interface to the DC interface (wired interface) of the corrector .

Communication lines from gas flow meter pulse sensors and absolute pressure sensor to LNG are made with KMM2x0.35 cable, and from temperature sensor with KMM4x0.35 cable. Communication lines are routed along walls in the cable channel. Wire screens must be grounded.

To ensure intrinsically safe power supply of sensors, two energy barriers of CorundM4 spark protection are provided.

Extreme value of a relative error of measurement of volume of gas the RVG G160 counter with the proofreader EK270 and sensors of pressure and temperature no more than ±3%

To connect the EC270 gas volume corrector to the personal computer via the RS232 wired serial interface with subsequent printing, a KA/K adapter cable manufactured by ELSTER Gazelectronika LLC is provided.

The design of the measuring complex allows using the MP260 functional expansion module to constantly connect various devices of the type (printer, modem, PC, etc.) for transmitting or printing the interval archive (printer), remote control of the corrector (modem, PC).

The technical solutions adopted in the working drawings comply with sanitary, fire and other standards applicable in the territory of the Russian Federation and ensure safe operation of the facility for life and health of people, subject to the measures provided for in the working drawings. Installation and commissioning works are carried out by specialized organizations in accordance with the norms and rules in force on the territory of the Russian Federation.

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