Architectural and space-planning solutions

An automated gas boiler house with a fuel storage was designed, designed for heat supply of preschool educational institutions. The boiler house and fuel storage building is designed from two block modules. The block module of the boiler house is one-story, rectangular in plan, without a basement, with dimensions in the extreme axes of 7,8x3,3 m. The fuel storage unit is one-story, rectangular in plan, without a basement, with dimensions in the extreme axes of 3,8x3,3 m. The boiler room and fuel storage are designed with one exit to the outside. The maximum height of the building from the planning mark of the ground to the mark of the ridge is 3,49 m. For the relative mark of 0,000, the level of the clean floor of the boiler room is taken, corresponding to the absolute mark of 14.13. The frame is metal. External walls and covering - from three-layer sandwich panels 100 mm thick with mineral wool filling. The roof is made of a polymer membrane, the drain is external unorganized. Floor covering - corrugated aluminum sheet. Easily dumped structures are provided - wall sandwich panels with an area of ​​3,63 m². To remove combustion products, a chimney with two gas outlets is designed, which is installed on a separate columnar foundation. The height of the chimney is 10,0 m from the level of the clean floor of the boiler room.

Structural and space-planning solutions

The modular boiler house is designed from easily assembled metal structures with "sandwich" paneling. Metal structures are made of a closed bent profile 150x100x6, 100x4, etc. (connections from a bent profile 50x4) in accordance with GOST 30245-2003. Steel structures C245. The outer walls are hinged "sandwich" panels 100 mm thick. Roofing roll on a heater and a pro-thinned-out sheet. The spatial rigidity and stability of buildings is ensured by the joint work of columns, vertical ties and a hard disk of the coating (profiled sheet). The foundations are taken in the form of a monolithic reinforced concrete slab 200 mm thick, concrete B15, W4, F100. Under the foundation, concrete preparation is provided with a thickness of 100 mm on a sand cushion of 850 mm and preparation of crushed stone 200 mm. The chimney (2 flues) 10 m high and 400 mm in outer diameter are fixed on a spatial metal structure installed on its own foundation. The metal structures of the chimneys are made of racks (a pipe with a diameter of 133x4) united by a lattice of a 60x40x4 bent-welded pipe. The foundations for the pipe are columnar from monolithic reinforced concrete on a sand cushion of 500 mm. Concrete B15, W4, F100. The relative elevation of 0.00 corresponds to the absolute elevation of +14,13 m. In accordance with the report on engineering and geological surveys of Skyline LLC (registration No. 2985/1) of 2012, the foundations of the boiler house and chimney are based on heavy silty loams with interlayers of sand, fluid-plastic with E=70 kg/cm2, φ=12, c=0,12 kg/cm2. The design resistance of the foundation soils is not lower than ~R=0,66 kg/cm2. The pressure on the ground does not exceed p=0,64 kg/cm2. The maximum level of groundwater near the day surface. Groundwater is not aggressive to concrete of normal permeability. In order to protect the concrete of underground structures, the concrete surface is protected by the Hydrotex-K waterproofing device. The expected average settlement of the building is not more than 3 mm. Pipe stability is guaranteed.

Engineering equipment, utility networks, engineering activities

It is planned to install a block-modular automated gas boiler house. The boiler room is intended for heat supply of heating systems, ventilation and preparation of hot water supply in the ITP of consumers of preschool educational institutions. The boiler house belongs to the second category in terms of heat supply reliability. The boiler room, by location, is separate. Category for explosive, explosive and fire hazard - G, fire resistance of the building - II The installed capacity of the boiler house is 0,550 MW. Heat consumers belong to the second category in terms of heat supply reliability. The boiler room is equipped with two water-heating boilers of the Buderus type of the SK645 series, with a capacity of 300 kW and 250 kW. Boiler SK645 with a power of 300 kW is completed with a combined burner VGL04.440 Duo with a power of 120 - 440 kW by ELCO. Boiler SK645 with a power of 250 kW is equipped with a combined burner VGL04.350 Duo with a power of 95-350 kW by ELCO. The estimated heat output of the boiler house, taking into account losses in the networks and auxiliary needs of the boiler house, will be 0,550 MW, including: for heating - 0,189 MW; ventilation - 0,146 MW; for the preparation of hot water supply in the IHS of consumers - 0,149 MW; for losses in heat networks - 0,0302 MW; for own needs of the boiler house - 0,0163 MW. From the building of the boiler plant for heat supply to consumers, heat networks are designed. Heat load of heat consumption systems of connected subscribers – 0,463 Gcal/h. Connection point - valves in the boiler room. The laying of pipelines of the heating network is two-pipe. Laying of pipelines of the heating network - underground, channelless, in the channel when laying on the territory of the preschool educational institution, at the corners of the pipelines, in a case under the driveways and aboveground along the technical underground of buildings. For laying pipelines, steel pipelines were selected according to GOST 10704-91 in PPU-345 insulation for underground laying and in insulation with mineral wool cylinders laminated with aluminum foil when laying along the technical underground. The main type of fuel is natural gas of medium pressure, lower calorific value QpН= 33,5 MJ/m³ (8000 kcal/m³), density - 0,681 kg/m³. The gas pressure at the inlet to the boiler room is 0,192 MPa (g). Emergency fuel - diesel, net calorific value 42,62 MJ/kg (10180 kcal/kg). The operating mode of the boiler house is around the clock, all year round. Thermal mechanical equipment is installed in the boiler room: pump, circulation network circuit K3.1...K3.4 from Wilo (Germany) IPL 32/175-4/2 with a capacity of 18,9 m³ / h and a head of 31 m. Pump operation mode - 1 working + 1 standby, with frequency regulation; boiler mixing pump "Buderus Logano SK645 300 kW" - TOP-S 25/5 3 ~ K5.1, K5.2 from Wilo (Germany) with a capacity of 3,1 m³ / h and a head of 4 m; boiler mixing pump "Buderus Logano SK645 250 kW" - TOP-S 25/5 3 ~ K5.1, K5.2 from Wilo (Germany) with a capacity of 2,6 m³ / h and a head of 3 m; booster pump K4.1, K4.2 from Wilo (Germany) MVI 103 3 ~ with a capacity of 0,3 m³ / h and a head of 250 kPa. Operating mode of pumps - 1 working + 1 standby, with frequency regulation; automatic continuous softener HYDROTECH STF 0835-9000 SEM; proportional dosing complex HYDROTECH DS 6E151; proportional dosing complex HYDROTECH DS 6E1. At the lowest points of the pipelines of the boiler house, installation of devices for draining water is provided, and at the upper points - the installation of air vents. To account for the consumption of thermal energy, it is planned to install a metering unit based on electromagnetic flowmeters PREM-40. Two metal chimneys with an internal diameter of 300 mm are designed to remove combustion flue products. The temperature of the outgoing flue gases is 180°С. The design documentation provides for thermal insulation of pipelines, gas ducts and equipment. The heat supply scheme is two-pipe, closed, independent. The temperature curve of the heat supply system is 105°/80°C. It is envisaged to regulate the temperature of the coolant depending on the winter / summer operation mode, 105/80 and 75/40, respectively. Regulation of the boilers and maintaining the necessary parameters of the coolant is provided by the automation of the boiler room. The operation of the boiler room is in automatic mode, without the constant presence of service personnel. To compensate for the thermal expansion of water, the installation of two membrane expansion tanks CM.ERE / 300 with a volume of 300 liters is provided. Gas supply to the boiler house is provided in accordance with the specifications. The gas pressure at the inlet to the boiler room is 0,192 MPa (g). The maximum gas consumption is 64,3 m3/h. The source of gas supply to the boiler house is provided by hydraulic fracturing. In accordance with the technical specifications, the connection of the projected facility is provided for to the existing polyethylene gas pipeline of the village. The tie-in point of the designed gas pipeline into the existing underground medium-pressure polyethylene gas pipeline Æ110x10,0 mm, passing through the yards with the installation of a steel ball valve 50/63 with an elongated stem, a valve with polyethylene couplings of the Vexve327 series. From the tie-in point (PK0), the route of the underground polyethylene gas pipeline Æ63x5,8 mm is provided by open method up to PK0 + 11,90. The route turns by 90° and is laid by directional drilling under the carriageway up to PK0+81,90. Two pits are provided for the directional drilling method. Further, the route turns by 90° and the open laying method goes to the designed boiler house with the gas pipeline exit to the boiler house facade. One-piece connection PE-steel is installed on a horizontal section of an underground gas pipeline at a distance of 2 m from the foundation of the boiler house. Further, a steel gas pipeline Æ57x3,0 mm should pass along the facade of the boiler house and be introduced into the building near axis No. 1. A security zone is established along the route of the external gas pipeline in the form of a territory bounded by conditional lines passing at a distance of 2 meters from each side of the gas pipeline. A quick-closing solenoid valve is installed at the gas inlet to the boiler room, which ensures shutdown of the gas supply. When the gas valve is actuated (closed), an alarm signal is transmitted to the control panel. Commercial accounting of the amount of gas entering the boiler room is carried out by the RVG G16 gas meter. Gas pressure and temperature control is provided by the LNG 761.2 corrector. The specified set of devices performs simultaneously showing, registering and summing functions. Steel electric-welded straight-seam pipes according to GOST 10704-91, V-10 GOST 10705-80* were selected for laying the gas pipeline. At the gas pipeline inlet to the boiler room, the following are installed in sequence: thermal shut-off valve KTZ 001-40; gas filter FG-Nord P Du40; solenoid valve VN11/2N-3i VN1N-4; gas meter RVG G16. The project provides for backup fuel supply. Diesel fuel is used as a reserve fuel in the boiler house. The required stock, calculated for 5 days, will be 8 tons. For storage of reserve fuel in the fuel storage adjacent to the boiler house, 4 fuel tanks T2000K3 with a volume of V = 2000 liters are installed. At the fuel inlet to the boiler room, a ball valve and a quick-acting shut-off valve with an electric drive are installed, which ensures that the fuel supply is turned off in the following cases: failure of protection circuits, including power failure; achievement of the second threshold (1% of methane from the volume of air in the boiler room) of the gas contamination of the boiler room - instantly; triggering of the fuel sensor at the lower limit; the fire alarm is triggered immediately. When the solenoid valve is actuated (closing), an alarm signal is transmitted to the control panel. Purification of fuel from mechanical particles is carried out in a filter installed at the inlet of the fuel line to the boiler room. The degree of contamination of the filter is determined by the pressure drop on it, which is determined by the readings of pressure gauges before and after the filter ... After the filter, pumps are installed, due to which the fuel is circulated. Quantity accounting