Residential complex Clear sky Kazan, st. Orenburg tract - internal gas supply

5.6.1 General part

a) Information on the execution of the decision (permit) on the establishment of types and limits of fuel for installations that consume fuel:

The working gas supply project of a heating boiler house with a capacity of 11.5MW for the Clear Sky residential complex, located at Kazan, ul. Orenburg tract, was carried out on the basis of:

- Design Assignment dated February 27, 2009;

- specifications No. 961TO of 30.07.2008 given to LLC Gazpromtransgaz Kazan of EPU "Kazangorgaz".

- Resolution No. 0337/3355 dated 14.07.2008 "On the use of natural gas as fuel," issued by the Ministry of Industry and Trade of the Republic of Tatarstan.

Permit No. 0337/3355 of the 14.07.2008 "On the use of natural gas as fuel," establishes as the main type of fuel:

- natural gas as the main type of fuel;

- liquid fuel as a reserve fuel.

b) Characteristics of gas supply source in accordance with specifications:

In accordance with specifications No. 961TO from 30.07.2008 issued by Gazpromtransgaz Kazan LLC of EPU Kazangorgaz, gas supply to the boiler house is provided from the steel gas pipeline dy150 under construction to the boiler house of the Bakhetle store.

The pressure at the connection point is 0.2 MPa.

The volume of gas used is 3.43 thousand tons/year.

c) Information on the type and number of units consuming fuel:

This project provides for the installation of 4 heating boilers from Riello (Italy) in the boiler house, namely:

- 2 steel heat-tube boilers Riello RTQ 3500 I (usable capacity 4.070 MW, efficiency 92.192.2%) equipped with supercharged monoblock modulated dual-fuel gas/diesel burner Riello RLS 500/M BLU. Gas flow rate 210.0 - 420.0 nm ³/h for each boiler .

- steel heat tube boiler Riello RTQ 1750 I (usable capacity 2.100 MW, efficiency 92.092.2%) equipped with supercharged monoblock modulated dual-fuel gas/diesel burner Riello RLS 250/M. Gas flow 110.0 - 250.0 nm ³/h per boiler.

- steel heat tube boiler Riello RTQ 1000 (useful capacity 1.188 MW, efficiency 93.094.2%) equipped with supercharged monoblock modulated dual-fuel gas/diesel burner Riello RLS 160/M. Gas flow rate 60.0-140.0 nm ³/h per boiler.

d) Estimated (design) data on the gas demand of the capital construction facility:

The estimated gas demand of the designed heating boiler house is:

-1350nm3/h - during the period of maximum gas consumption (provides for operation of all 4 boilers in the maximum power mode);

- 54.92 nm3/h - during minimum gas consumption period (provides for operation of Riello RTQ 1000 heating boiler in minimum power mode).

e) Justification of fuel mode:

The designed heating boiler house with a capacity of 11.5MW for the Clean Sky residential complex provides for the use of gas as fuel for:

- 2 steel heat-tube boilers Riello RTQ 3500 I (usable capacity 4.070 MW, efficiency 92.192.2%);

- steel heat-tube boiler Riello RTQ 1750 I (usable capacity 2.100 MW, efficiency 92.092.2%);

- steel heat-tube boiler Riello RTQ 1000 (useful capacity 1.188 MW, efficiency 93.094.2%).

For backup fuel supply, the design provides for the supply of liquid fuel (diesel fuel) to all 4 boilers.

The fuel mode is accepted on the basis of specifications No. 961TO of 30.07.2008, permission No. 0337/3355 of 14.07.2008 and according to the specification on design.

f) Description of technical solutions to ensure accounting and control of gas consumption and products generated using gas, including thermal and electrical energy;

The terms of reference for the development of a measuring and computing complex for commercial accounting of the consumption and volume of natural gas of IVKUG in a boiler house with a capacity of 11.5MW for the Clean Sky residential complex, in accordance with the specifications, were agreed in Tatgazinvest CJSC.

The project of the measuring and computing complex of commercial accounting of the consumption and volume of natural gas has a positive conclusion of a metrological examination.

For commercial accounting of gas flow and volume, the boiler room provides for the installation of a gas flow metering complex "Logic 7741" based on the rotary counter RVG G400 dy100 1:50, with a measurement of flow rates from 13m3/h to 650m3/h, and an LNG 741 corrector. The project provides for the output of information about the used gas:

- on PC in control room;

-to the printer.

Heat release accounting in the boiler room is provided using the TCRM computing system (TCR032) complete with electromagnetic flowmeters ERSV - 520F "TAKE-OFF," which are installed on the direct and reverse heating system pipelines (see section "Thermal and mechanical solutions").

g) Description and substantiation of the applied systems of automatic control and control of thermal processes:

The AK project section deals with issues of boiler room automation. Control of the combustion process and operating processes in the boilers is fully automated, carried out by the control system supplied with the equipment and sensors.

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

The boiler house design provides for equipment protection - safety automation, automatic regulation, control, alarm, process control.

At actuation of safety automation systems, at which the boiler is stopped, re-start is performed manually, after elimination of the cause of safety automation system actuation. Re-start is carried out in accordance with the requirements of the production instructions for starting the boiler, with the permission of the facility owner.

The automation design complies with the requirements of SNiP II3576 with modifications, operating manuals for equipment manufacturers.

The equipment is installed on boilers, steam pipelines, gas pipelines, liquid diesel fuel pipelines, gas ducts.

Information on equipment operation is also transmitted to local boiler boards and common to the boiler board.

Control and process protection:

- 2 steel heat tube boilers Riello RTQ 3500 I equipped with supercharged monoblock modulated dual-fuel gas/diesel burner Riello RLS 500/M BLU.

- steel heat tube boiler Riello RTQ 1750 I equipped with supercharged monoblock modulated dual-fuel gas/diesel burner Riello RLS 250.

- steel heat tube boiler Riello RTQ 1000 equipped with supercharged monoblock modulated dual-fuel gas/diesel burner Riello RLS 160/M.

Devices are provided that automatically cut off the supply of natural gas or diesel fuel to the burner at:

• Power outage of 380 V per burner

• Reduced pressure of natural gas upstream the burner

• Increased pressure of natural gas upstream the burner

• Reduced pressure of liquid diesel fuel upstream the burner

• Reduction of air pressure upstream of the burner

• Torch flare failure

• Increase (high) boiler water level

• Lower (low) boiler water level.

Also provided (without disconnection of fuel supply)

• From the increase and decrease of pressure in the gas pipeline to the boilers, a safety shut-off valve (PSV) built into the gas pressure regulator to the boilers.

Light and sound signalling is provided with mandatory recording and storage of the reasons for equipment shutdown on information screens of controllers (service console), which cause the alarm to be turned on:

- gas content of the room with natural gas CH4 when reaching 20 percent of the lower accessory of flammability of natural gas.

- gas content of the room with carbon oxide (CO) when the I concentration threshold is reached, and when the II concentration threshold is reached, the supply of natural gas or diesel fuel to the boiler room is additionally stopped

- at actuation of the main fast-acting shut-off valve at the gas pipeline inlet to the boiler room

- power outage of 380 V per burner

- reduced pressure of natural gas upstream the burner

- increased pressure of natural gas upstream the burner

- reduced pressure of liquid diesel fuel upstream the burner

- increased air pressure upstream the burner

- torch flare failure

- increase or decrease of boiler water level

The boiler burner maintains the specified "gas air" ratio, automatically checks the tightness of the gas path and adjusts the heat power of the boiler in automatic mode, using the controller. "

In automatic mode, the boiler burner controller provides the following functions:

- automatic start-up and shutdown of the boiler;

- monitoring and protection by main process parameters;

- provision of regulatory interlocks in the process of control;

- alarm of process failure and storage of causes of boiler shutdown;

- control of the boiler in automatic and remote mode (from the upper control level).

The boiler room is provided and exists in accordance with the requirements of SNiP II3576. Revision 1, item 14.6 and "Instructions for control of carbon monoxide content in boiler rooms" item 4.5 for boiler rooms, automatic disconnection of fuel supply to the boiler room when the boiler room is gas-free with methane (20 ± 5%) NKPR and carbon oxide (100 ± 5) mG/m3, as well as when power is cut off in the boiler room. For this purpose in boiler house on common gas pipeline there installed is valve - cutoff, which is controlled by its existing complex of boiler house.

In case of gas pollution in the boiler house (20 ± 5) mG/mZ, there is a warning alarm in the boiler house.

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