Gas supply to the roof boiler house

Common part.

The working project provides gas supply to the autonomous roof boiler house No. 1 with a capacity of 3.75 kW (3x1250kW) of the shopping and entertainment center with parking on the others. General Vatutin in the Dnieper and Desnyansky districts of Kiev.

Working documentation is developed on the basis of:

- Technical Specifications of KIEVGAZ OJSC dated 13.10.08 No. 338221776 ;

- Technical requirements of the Territorial Administration of the State

energy conservation inspections in the Kiev region and

Kyiv, 12 May 2006, No. 06/181/366;

- Permission of the Ministry of Economy of Ukraine for the use of natural gas dated 14.08.2001, No. 4366/787;

- Design tasks;

- Drawings of architectural and construction part of the project;

- Agreed design solutions at stage "P."

2. Characteristics of the object.

Roof autonomous boiler house No. 1 of the shopping and entertainment center with parking on ave. General Vatutin in the Dnieper and Desnyansky districts of Kiev is located on the shopping and entertainment center at 19.000 in the axes 710/ZD/1 (above the technical room without a permanent stay of people).

According to the design heat loads in boiler house No. 1, three high-efficiency, automated water heating boilers "Vitiplex200" by VIESSMAN, Germany are provided. Rated thermal capacity of one boiler 1.250 MW (1.075 Gcal/h).

The design capacity of boiler house No. 1 is 3.36 MW (2.889 Gcal/h).

Operation of boiler house No. 1 is provided without permanent stay of maintenance personnel, with periodic visual monitoring of equipment operation, according to the approved operating manual of the boiler house after its commissioning.

Source of gas supply are external distribution gas networks of average pressure of Ru - 1.0 kg/cm2 (0.1 MPas), Du 250 in which insert by the Ø219x7.0 pipeline (taking into account capacity on boiler house No. 1 and No. 2) with its conclusion to a strut on otm is carried out. 19.000, which is located in axes P12P13/33 further along the roof (bottom of the pipe at a distance of 500 mm from the roof) and the walls of the roof buildings to SGR MN50.02 (cabinet control point) with a commercial gas flow metering unit at its inlet (UUG G400.01.00). Off-site networks are performed by another organization.

With SRP gas of low pressure on the separate Ø133x4.0 pipelines is supplied to boiler house No. 1 and No. 2.

Diameters of medium and low pressure gas pipelines are determined on the basis of hydraulic calculations made according to formulae E.1- E13

DBN B.2.5-20-2001:

main pipeline at tie-in - d = 219x7.0 (GOST 873278) -

average pressure 0.1 MPa, gas velocity - 15 m/s;

branches of the gas pipeline to boiler houses No. 1 and No. 2 - d = 133x4.0, speed

motions - 3 m/s.

3. Gas supply. Internal devices

The work documentation of gas supply of roof autonomous boiler house No. 1 with a power of 3.75 kW (3х1250 kW) with the general consumption of gas on the boiler house

384.18 nm3/hour shopping and entertainment center with parking on ave. General Vatutin in the Dnieper and Desnyansky districts of Kiev was developed in accordance with the current rules, norms and standards .

The Ru low-pressure gas pipeline of 2.703.00 kPa of Ø133x4.0 after SRP is entered into the boiler house (Ru of 2.56 kPa).

Diameter of gas pipeline is determined on the basis of hydraulic calculation.

Gas pipeline inlet through wall into boiler house is made in case, which is sealed after pipe laying.

At the inlet of the low pressure gas pipeline in the boiler room No. 1, a quick-acting shut-off valve MAG is provided. Near each boiler there is an aggregate gas flow metering (gas counter "GMSG10080" D = 80mm).

Automatic closing of the valve is provided when the boiler room gas alarm system, fire alarm system and power outage are activated.

On input to boiler house No. 1 the general gas pipeline (collector) Ø133x4.0 is mounted on an internal wall with separate branches on each copper of "Vitoplex200".

Horizontal sections of gas pipelines are laid with a slope of 0.003 in the direction of gas movement, and blowdown and safety gas pipelines are laid towards the main gas pipeline.

Before each copper of "Vitoplex200" the Ø76x3.0 gas pipeline of low pressure passes through a reducing node of the line of low pressure upon the Weishaupt WMG20 gas burner .

The reduction unit and burner are supplied with the Vitoplex200 boiler or supplied by Weishaupt, Germany.

The gas supplied to the boiler house is odorized according to GOST 554287. Heat of gas combustion - 8000 Kcal/nm3, density - 0.72 kg/nm3

The boiler house gas equipment is adopted taking into account the technical characteristics of the installed VITOPLEX 200 boilers of VIESSMANN, Germany, which operate on low pressure gas (inlet pressure 2.3 kPa ).

Ignition system - gas block burner WMG20.

Safety automation and regulation - "VITOTRONIC."

Design gas flow to boiler house:

- winter - 384.18 nm3/h;

- summer - 64.03 nm3/hour.

Blowdown (candlelight) lines are provided on the boiler house gas pipelines with their outlet to the height not less than 1.0 m above the boiler house roof:

- Ø32x2.0 from the general gas pipeline (collector) with installation of the union with the crane for sampling of Du15;

- Ø32x2.0 from each copper before a reducing node of the regulator of pressure with installation of the union with the crane for sampling of Du15;

- Ø57x3.0 from the gas pressure regulator.

Connections of all gas pipelines are installed on welding. Installation and testing of gas pipelines are carried out in accordance with the requirements of DBN B.2.5202001 "Gas Shutdown" and "Safety Rules for Gas Shutdown Systems Ukraїni," DNAOP 0.00.1.2098.

The gas pipelines are provided with the necessary shut-off, shut-off and control valves, which ensure safe gas combustion, and a system of purge gas pipelines.

After the strength and density test, the boiler house gas pipelines are covered on the ground with a yellow paint coating in two times in accordance with GOST 142026969 and GOST 466675. Conventions as per GOST 2785 and GOST 2.60983.

Combustion products removal, boiler room ventilation taking into account air inflow to combustion, gas alarm system as per CO and CH4, fire alarm are provided by sections TM, OM, AGPV.

4. Gas supply. External networks

The working documentation of the boiler room's external gas supply networks provides for the connection of the SHRP cabinet control points to the existing medium pressure networks.

Gas consumers are roof boiler rooms No. 1, No. 2 of the shopping and entertainment center.

The work documentation provided laying of the gas pipeline input of average pressure (R =0.1 MPas), underground and land on a building facade, on the walls on brackets and a roof on low support (N ≥ 500 mm) to the general metering station of gas and "SRP".

Laying of underground gas pipeline-medium pressure inlet is provided by PE polyethylene pipes with diameter 219x7.0 at a depth of at least 1.0m from the ground surface to the top of the pipe above the utility networks crossed by it (except for electrical ones). Polyethylene pipes and shaped parts comply with the requirements of DSTU B.B.2.77389. Connection of the designed gas pipeline to the existing one is carried out by steel pipes with installation of shut-off valves - steel flange ball valve Du200 at the point of tie-in with removal of control elements under the carpet (colodless version). Crane is controlled through casing pipe, which is brought under carpet with hatch.

The connection of the polyethylene gas pipeline with the steel gas pipeline is provided at the place where the gas pipeline leaves the ground (on the wall of the building in the protective case). Insulation of the case and part of the steel gas pipeline at the tie-in point is provided "very reinforced."

At the place where the gas pipeline leaves the ground on the wall of the building, a Dou200 shutoff gate valve is installed.

In order to prevent damage of polyethylene pipes during earthworks, a yellow polyethylene tape with a non-washable "GAZ" inscription is laid in the ground at a distance of 0.4-0.5 m from the top of the pipe. When the gas pipeline crosses electrical and communication cables, the distance between them is accepted as 0.5 m.

In order to prevent gas contamination of nearby utilities wells, holes are provided in the manholes of wells located at a distance of 50 m from the gas pipeline.

The bringing gas pipelines of average pressure to SRP Ø219h7.0 and low pressure from SRP to boiler houses Ø133x4.0 are defined on the basis of hydraulic calculation.

Gas pipeline entry into boiler house through wall is made in case. A shutoff ball valve is installed outside, at the inlet.

Design gas flow rate for two boiler houses:

- winter - 768.32 nm3/hour ;

- summer - 128.06 nm3/hour.

Commercial (general) accounting of gas consumed by two boiler houses (No. 1 and No. 2) is installed up to SGR. In the boiler rooms there is an aggregate gas metering.

Commercial gas metering includes: "Delta S3F G400" gas meter, filter, isolation valves and instruments.

The fiscal metering system of gas is mounted on an external wall of the building adjoining boiler house No. 2 on the gas pipeline of average pressure Ø219x7 before SRP with a further conclusion of a signal in dispatching office of shopping center .

A quick-acting shut-off valve is installed at the inlet of the low-pressure gas pipeline, which duplicates the shut-off flange ball valve. Automatic closing of the valve is provided when the boiler room gas alarm system, fire alarm system and power outage are activated.

Horizontal sections of gas pipelines are laid on brackets along walls and on low supports along the roof of the building with a slope of 0.003 in the direction of gas movement, and blowdown gas pipelines and safety gas pipelines - towards the main gas pipeline. Gas pipeline for self-compensation is divided into sections, which are fixed by fixed supports.

Connections of all gas pipelines are installed on welding. Installation and testing of gas pipelines are carried out in accordance with the requirements of DBN B.2.5202001 "Gas Shutdown" and "Safety Rules for Gas Shutdown Systems Ukraїni," DNAOP 0.00.1.2098. After the strength and density test, the boiler house gas pipelines are painted on the ground with a paint coating in two times yellow in accordance with GOST 1420269. The gas pipelines are provided with the necessary shut-off, shut-off and control valves, which ensure safe transportation of gas.

4. Energy conservation measures and their efficiency. Number of maintenance personnel.

The project proposes the construction of a shopping and entertainment center with hot water boilers, which allow to provide savings in both electric and thermal energy.

The number of boilers and boilers was selected on the basis of design data and technical specification of OJSC Kievgaz dated 11.05.06 No. 65913711.

For measurement and control of gas flow, the design provides for commercial and unit units for gas flow metering. Commercial (general) accounting of gas consumed by two boiler houses is installed up to SGR. Commercial gas metering includes: gas meter "Delta S3F G400," filter, isolation valves and instruments and A. Gas metering includes "GMSG100" D = 80mm.

The design provides for automatic regulation of gas combustion with the help of burners WMG20.

The project has developed water treatment for this type of boilers "Vitoplex200." According to the requirements of Section 10 of SNiP P3576 and the technical conditions of the boiler manufacturer, a scheme of single-stage sodium cation treatment using an automatic water treatment plant based on "SD14" was adopted for anti-tank treatment of make-up water for the boiler house.

To take into account cold water consumption for water treatment, for hot water supply and on the circulation pipeline of the MCG, the project provides for the installation of meters.

The operation of the boiler equipment is controlled from the automation center according to the temporary program. From the time program it is possible to change setpoints of adjustable values. Manual control mode is provided for maintenance and adjustment.

Viessmann Vitoplex hot water boilers are equipped with their own automation centers. They maintain the coolant temperature in the main heat supply circuit at 70 ° C. From the building control system, boiler automation centers can output an "external blocking" signal and observe an "accident" signal.

In addition, in order to ensure a more economical operation of the shopping and entertainment center, the following energy-saving measures are provided:

- automated process control system (APCS) using modern technical means based on reliable microprocessor equipment;

- installation of pumps with frequency converters;

- application of improved heat insulation materials.

To ensure efficient operation of the process equipment of the roof boiler rooms, the design provides for an automated process control system (APCS), using modern technical means based on reliable microprocessor equipment. Such a solution creates prerequisites for the operation of technological equipment in the mode of efficient energy saving. This is achieved by making optimal decisions by the automated control system at each moment of operation of the system to eliminate arising disturbances of both external and internal order.

The main subsystems of APCS involved in creating the energy saving effect are:

- automated start-up subsystem;

- subsystem of automatic control of technological processes;

- fuel flow metering subsystem;

- heat release metering subsystem.

During startup, due to the complexity and speed of the ongoing technological processes, their optimization significantly affects the efficiency of fuel use and service life.

Therefore, I&C implements an ignition algorithm, which allows to bring the equipment into operating mode with the lowest fuel costs and with observance of thermal start-up modes.

The energy efficiency of the main process equipment is ensured by the corresponding automatic controllers, which maintain within narrow limits the process parameters in numerous controlled points for possible operation modes - start-ups, shutdowns, load changes, changes in external and internal process conditions.

The high-efficiency element of the subsystem is the circuit pressure control circuits by changing the revolutions of the electric motors of the network pumps using highly reliable frequency regulators.

All this allows to obtain fuel economy up to 1%.

The above measures allow to obtain optimal results for the accepted technological equipment. At the same time, both fuel unit costs and absolute fuel costs associated with reducing the time of decay operations are reduced.

The system of commercial accounting of released heat and consumed fuel allows assessing the operational state of process equipment and, accordingly, planning timely repairs.

When the pump motors are equipped with a frequency-controlled drive, it becomes possible to ensure the optimal mode of operation of the equipment by adjusting the speed, which gives the maximum effect of energy saving and provides a sparing mode of operation under significantly reduced loads and dynamic effects, and this in turn helps to increase the service life and depreciation time of the equipment several times, reduce operating costs for repairs. Energy saving is the most important indicator in determining the feasibility of equipping electric motors with an adjustable electric drive.

An important element of energy saving is the technology of applied thermal insulation of external surfaces of pipelines with surface temperature above 45 ° С.

In the design, thermal insulation structures were selected taking into account the provision of industrial installation methods, the possibility of quick replacement during the repair of equipment in areas that are subject to inspection and control, using the range of thermal insulation materials manufactured in Ukraine.

To ensure the main requirement for the preservation of thermal and electrical energy, the selection of thermal insulation structures and materials is made in accordance with the requirements of SNiP 2.04.14-88 "Thermal insulation of equipment and pipelines" with tightening of the standards of permissible thermal losses by 25-35%.

For periodic (once a shift) maintenance of boilers, a staff (0.5 people) is provided from among the staff of the enterprise specially trained for this, and who have a certificate for servicing the boiler room.