Architectural and space-planning solutions

The design documentation provides for the construction of an automated gas boiler house with a diesel generator room. The building of the boiler house is one-story, rectangular in plan, with dimensions in the axes of 12,80 x 6,80 m. The height of the building from the planning mark of the ground to the top of the coating is 3,43-3,33 m. The mark of the clean floor of the boiler room is taken as a relative mark of 0,000 . A boiler room with one external entrance and a diesel generator room with a separate external entrance and an entrance to the boiler room were designed in the building. Two outer walls of the building (along axis A and along axis 3) are designed from hinged "sandwich" panels with a thickness of 100 mm, and two outer walls of the building (along axis B and along axis 1) are designed (to ensure sound insulation) with a thickness of 120 mm from two hinged "sandwich" panels 60 mm thick. The walls between the boiler room and the diesel generator room are designed from hinged "sandwich" panels 100 mm thick. There are no window blocks in the boiler room and diesel generator room; hinged “sandwich” panels are designed as easily dumped structures in the area where the boilers are located. The work of the boiler room and diesel generator is automated, without a permanent stay of service personnel. The roof is rolled flat with an unorganized external drain. Gas ducts (two chimneys) from the boiler house are designed on a separate foundation. The height from the planning mark of the earth to the top of the pipe is 26.15 m.

Structural and space-planning solutions

In accordance with technical surveys, the existing building was built in the second half of the 1.68th century according to a wall structural scheme. The project provides for the dismantling of the above-ground structures of the boiler house in accordance with the targeted program. The foundations of the existing boiler house are made of rubble masonry. Foundation laying depth 2.08÷760 m, base width 1140÷130 mm. At the base of the foundations, silty sands of medium density lie with E=2 kg/cm28, φ=0,70, epeski=0,03, c=2 kg/cm100. The technical condition of the foundations is operational. The project provides for the dismantling of the above-ground part of the boiler house and the construction of a modular boiler house. The building was designed according to the frame structural scheme. The boiler room is designed from metal structures with sandwich paneling. Columns - a closed bent profile 4x80 (connections from a bent profile 4x30245) in accordance with GOST 2003-100. Beams - bent-welded pipes 4x80 and 4x30245 in accordance with GOST 2003-60. The cover is designed from profiled sheet H845-0,8-100 along the beams. External walls are hinged "sandwich" panels 120 mm and 60 mm thick (paired "sandwich" panels 150 mm thick). The lower (support) frame is made of bent-welded pipes 100x6x30245 according to GOST 2003-300. Spatial rigidity and stability of buildings is ensured by the joint work of vertical and horizontal connections. The foundations of the boiler house are existing strip foundations, on which a monolithic reinforced concrete slab 15 mm thick, concrete B6, W100, F100, is laid. A 2 mm thick concrete preparation is provided under the slab. Chimneys (700 flues with an outer diameter of 26) with a height of ~159 m 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 6x80) united by a lattice of a bent-welded pipe 40x5x15. The foundations for the pipe are columnar from monolithic reinforced concrete. Concrete B6, W100, F0.00. The relative elevation of 5,38 corresponds to the absolute elevation of +130 m. In accordance with the report on engineering and geological surveys, silty sands of medium density with E = 2 kg / cm28, φ = 0,7, epeski = 0,03, c = 2, serve as the basis 1,63 kg/cm2. The design resistance of the foundation soils is not lower than R=0,75 kg/cm2. The pressure on the ground does not exceed p=0,5 kg/cm4,6. The maximum level of groundwater at a depth of 5,40 m (absolute elevation 6÷2m). Groundwater is slightly aggressive to concrete of normal permeability in terms of the content of aggressive carbon dioxide and the content of sulfates. In order to protect the concrete of underground structures, the concrete grade for water resistance is WXNUMX, the concrete surface is protected by coating with a waterproofing compound. The expected average settlement of the building is not expected, since the designed building is lighter than the demolished one. Pipe stability is guaranteed. The technical inspection of the surrounding buildings has been completed. According to the results of the survey, the category of the technical condition of buildings in the surrounding area is XNUMXnd category.

Engineering equipment, utility networks, engineering activities

For heat supply of residential and public buildings, an automated, gas, attached boiler house has been designed. According to the degree of explosion and fire hazard and fire resistance, the boiler room belongs to the category "G" and "I". The installed capacity of the boiler house is 4,0 MW. Sandwich panels on a special mount are provided as easy-to-reset structures at the rate of 0,03 m2 per 1 m3 of volume. Heat consumers belong to the second category in terms of heat supply reliability. Two water-heating boilers of the GKS-Dinatherm 2000 brand with a capacity of 2000 kW from the WOLF company with combined GKP burners from the Oilon company are installed in the boiler room. The estimated heat output of the boiler house, taking into account losses in the networks and auxiliary needs of the boiler house, will be 3,493 MW, including: for heating - 3,219 MW; for losses in heat networks and auxiliary needs of the boiler house - 0,274 MW. The main type of fuel is natural gas QpН = 33520 kJ/m3 (8000 kcal/m3). The operating mode of the boiler house is only during the heating period. The scheme for connecting heat networks intended for transporting heat carriers to heat supply systems is independent through heat exchangers. It is planned to control the temperature of the coolant depending on the outside air temperature. 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. The water temperature at the outlet of the boilers is 105°C. The heat carrier at the outlet of the boiler room is water with a temperature of - 95°C. To compensate for the thermal expansion of water, the installation of a membrane expansion tank ERE300 is provided. Auxiliary equipment is installed in the boiler room: individual pumps of the boiler circuit - IPL 65/120; network circuit pumps - IPL 50/165; booster pump - MVI 203; heat exchangers lamellar heating systems M15-BFM; installation of water softening STF. To account for the consumption of thermal energy, it is planned to install a metering unit based on electromagnetic flowmeters PREM-32. Metal individual gas ducts and two chimneys were designed to remove combustion flue products. The temperature of the outgoing flue gases is 180°C. The design documentation provides for thermal insulation of heat pipelines, gas ducts and equipment. Reserve fuel supply is not provided according to the letter of the Energy and Engineering Committee. The designed tank for diesel fuel with a volume of 750 liters, fuel lines and shut-off and control valves provide for the possibility of operating the boiler house on liquid fuel. To improve the reliability of power supply, it is planned to install an 88kVA SDMO J80K diesel generator with a fuel supply system, fittings and pipelines in a separate room. Gas supply to the boiler house is provided in accordance with the specifications. The connection point is an underground polyethylene gas pipeline of medium pressure with a diameter of 225 mm, laid along the street. Lomonosov. For gas supply to the boiler house, it is planned to lay an underground medium-pressure polyethylene gas pipeline PE80 GAZ SDR11 from the connection point to the exit from the ground at the facade of house No. 13, lit. the designed boiler house. On the facade of the boiler house, design solutions provide for the installation of ShRP-NORD-Dival600/40-1. Further along the facade of the boiler house, a low-pressure steel gas pipeline is laid before entering the building. Gas pressure at the tie-in point is 0,11 MPa. The gas pressure at the inlet to the boiler room is 5,00 kPa. Steel electric-welded straight-seam pipes according to GOST 10704-91, V-10 GOST 10705-80* were selected for laying. For commercial accounting of the amount of gas, a gas meter SG16-2500 is installed. The maximum gas consumption is 1343,8 m3/h. At the entrance of the gas pipeline to the boiler room, the following are installed in series: thermal shut-off valve KTZ-001; gas filter FN; solenoid valve VN6N; gas meters STG. 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 – 2,768 Gcal/h. The connection point is the collector of 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 approaching buildings, at the corners of the pipelines, in a case under driveways and aboveground along the technical underground of buildings. For laying pipelines, steel pipelines were selected according to GOST in PPU-345 insulation for underground laying and in insulation with mineral wool cylinders laminated with aluminum foil when laying along the technical underground. With pipeline diameters less than 150 mm, for underground laying, Isoproflex pipelines in PPU insulation were selected. Water supply (cold water) and water disposal of the consumers of the facility is provided in accordance with the conditions of connection. Water supply (cold water) is provided from the public water supply networks D = 500 mm from Zagorodny pr. on two inputs from pipes PE100SDR17 D=80 mm. The inputs provide for the installation of water metering units according to TsIRV 02A.00.00.00 (sheets 30,31). Guaranteed pressure at the connection point - 28,0 m w.c. Estimated consumption of cold water - 9,59 m3/day, including: for household and drinking needs - 0,05 m3/day; for technological needs - 9,54 m3/day; periodic needs - 60,99 m3 / day (filling the networks and the boiler circuit once a year). Water consumption for internal fire extinguishing - 5,0 l / s (2 jets of 2,5 l / s). The building has an integrated plumbing system. The number of fire hydrants D=50 mm - less than 12 pcs. The required pressure for the integrated water supply system is 25,41 m of water. The integrated water supply system is a dead-end, single-zone. Stainless steel pipes were chosen for the device of the integrated water supply system. External fire extinguishing is provided from a fire hydrant D = 125 mm, installed on public water supply networks. Water consumption for external fire extinguishing - 10,0 l / s. Drainage of domestic wastewater in the amount of 0,23 m3 / day, periodic discharge - 9,39 m3 / day 1 time per year (emptying the boiler circuit), rainwater with a flow rate of 2,81 l / s is provided for in the nearest manhole on the network yard communal combined sewer D=230 mm at house number 13, lit. In along Zagorodny pr. Polypropylene sewer pipes D = 160-225 mm were selected for laying the combined sewerage network. Industrial sewage systems (for the removal of conditionally clean effluents from boiler equipment) and external drains were designed for the building. Cast-iron sewer pipes were chosen for the installation of industrial sewage systems. In the boiler room, heating is provided at the expense of heat surpluses and additionally air heating is provided by heating units. Ventilation is natural. Extract - through deflectors in the volume of 3-fold air exchange, inflow - through louvered grilles in the outer walls, taking into account the compensation of air for combustion. The diesel one provides for radiator heating with the connection of devices to the piping system of the boiler room. Ventilation in diesel is natural: exhaust - through a deflector, inflow - through a louvered grille in the wall. In the operating mode, it is provided for the removal of gases from the diesel engine through the air outlet tube. The power supply of a detached gas boiler house in the courtyard area, designed to replace the existing one, is normally provided from the public electric networks of the centralized power supply system, in accordance with the Technical Specifications, Appendix No. 1 to the contract. Estimated power 75.56 kVA, voltage class 0,4 kV, connection points - RUNN 0,4 kV in a new transformer substation being built to replace transformer substation 456. In emergency mode, when the ASU is suddenly disconnected from the centralized power supply system, the power is switched to an autonomous source - a diesel generator set (DGU) with a capacity of 80 kVA, which is switched on automatically. The category of power receivers in terms of power supply reliability is the second, therefore it is provided from two independent mutually redundant sources, power receivers of security systems, in addition (of the first category), are backed up from the UPS. The grounding device of the boiler house consists of a common artificial external ground and a natural ground electrode - the foundations and floor of the boiler house building and the foundation of the chimneys. Electricity metering devices are installed on the ASU panels of the boiler room. The device of distribution and group networks - according to the standards, protective devices are installed on the panels of the ASU and local shields, lighting control devices and sockets for portable electrical receivers - on the walls. Grounding of open conductive parts of electrical equipment - through PE conductors in cables of the group and distribution network, the type of grounding system for open conductive parts is TN-S (separate), the equalization system and potential equalization comply with the standards. The adopted circuit design solutions of the electrical installation being designed ensure the electrical safety of uncategorized and operational personnel (solid insulation, shutdown of non-stationary processes, absence of contact voltage, etc.). Lightning protection of the building is provided by lightning rods on the chimneys, the metal frame of the boiler room with down conductors connected to the ground electrode. Automation of production processes, security systems and scheduling was carried out in accordance with the standards.