Architectural and space-planning solutions

The design documentation provides for the construction of an automated boiler house with a diesel generator room. The building of the boiler house is one-story, U-shaped in plan, with dimensions in the axes 14,73 x 22,39 m. The height of the building from the planning mark of the ground to the top of the coating is 5,35-4,51 m. buildings. For a relative mark of 0,000, the mark of the finished floor of the boiler room was taken. The building has a boiler room with two external entrances and a diesel generator room with a separate external entrance. The outer walls of the building are made of hinged "sandwich" panels 100 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 boiler area. The operation of the boiler room and diesel generator room is automated, without the constant stay of service personnel. The roof is rolled flat with an organized external drain. Gas ducts (four chimneys) from the boiler house are designed to be fixed to the existing wall of the adjoining building. The height from the planning mark of the earth to the top of the pipe is 21.15 m.

 Structural and space-planning solutions

 In accordance with technical surveys, the existing building was built in the second half of the 1.53th century according to a mixed construction 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 1.70÷650 m, base width 790÷270 mm. At the base of the foundations there are silty sands of medium density with E=2 kg/cm30, φ=0,65, epeski=0,04, 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 5x30245 according to GOST 2003-63, connections from a corner 5x80 and 4x30. Beams - steel from I-beams 1B35 ÷ 1B20 according to STO ASCHM 93-57. The cover is designed from profiled sheet H750-0,8-100 along the cover beams. The outer walls are hinged "sandwich" panels 300 mm thick. The spatial rigidity and stability of buildings is ensured by the joint work of columns, roof beams, vertical and horizontal ties. The foundations of the boiler house are existing strip foundations, on which a monolithic reinforced concrete slab 15 mm thick, concrete B8, W100, F100, is laid. A 21,0 mm thick concrete preparation is provided under the slab. Chimneys (flue stacks) with a height of 730 m and an outer diameter of 245 mm are fixed to a flat metal truss and attached to the brick walls of the existing building. Bearing metal structures are designed from channels and bent-welded pipes. Steel C0.00. The relative elevation of 5,51 corresponds to the absolute elevation of +270 m. In accordance with the report on engineering-geological surveys, the base of the sand cushion is dusty dense sands with E=2 kg/cm30, φ=0,65, epeski=0,04, c=2 .1,84 kg/cm2. The design resistance of the foundation soils is not lower than R=0,53 kg/cm2. The pressure on the ground does not exceed p=0,5 kg/cm4,7. The maximum groundwater level at a depth of 5,40 m (absolute elevation 8÷30 m). Groundwater is moderately aggressive to concrete of normal permeability in terms of the content of aggressive carbon dioxide. 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 bitumen twice. The settlement of the building is not expected, since the designed building is lighter than the demolished one. The stability of the pipes is ensured. In the case of approaching the surrounding buildings closer than XNUMX meters, indicate the need to organize observations of existing buildings. The expected additional settlement of the surrounding buildings is less than the maximum allowable values.

 Engineering equipment, utility networks, engineering activities

 For heat supply of residential and public buildings, an automated, gas-fired, attached boiler house was designed (coordination of the placement of a heat supply source of the Committee on Energy and Engineering Support dated March 28.03.2011, 98 No. XNUMX). 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 11,2 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. The boiler house is equipped with four water-heating boilers of the GKS-Dinatherm 2500 brand with a capacity of 2800 kW from the WOLF company with combined GKP burners from the Oilon company. The estimated heat output of the boiler house, taking into account losses in the networks and auxiliary needs of the boiler house, will be 9,8815 MW, including: for heating - 9,108 MW; for losses in heat networks and own needs of the boiler house - 0,7735 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 thermal expansion of water, the installation of a membrane expansion tank ERE/600 is provided. Auxiliary equipment is installed in the boiler room: individual pumps of the boiler circuit - IPL 80/140; network circuit pumps - IL 80/190; booster pump - MVI 403; 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 four 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. 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 a 220 kVA SDMO J200K 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 a medium-pressure steel gas pipeline with a diameter of 219 mm. For gas supply to the boiler house, it is planned to lay an underground polyethylene gas pipeline of medium pressure PE80 GAZ SDR17,6 from the connection points to the exit from the ground near the facade of the boiler house being designed. On the facade of the boiler house, design solutions provide for the installation of ShRP-NORD-Norval65-1. Further along the facade of the boiler house, a low-pressure steel gas pipeline is laid before entering the building. The gas pressure at the tie-in point is 0,109 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 8; solenoid valve VN; 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 – 7,832 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 object's consumers is provided in accordance with the connection conditions. Water supply (HWS) is provided from the public water supply networks D = 400 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 - 26,19 m3/day, including: for household and drinking needs - 0,1 m3/day; for technological needs - 26,09 m3/day; periodic needs - 164,93 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 20,82 m of water. The integrated water supply system is a dead-end, single-zone. Steel water 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 0,27 m3 / day, periodic discharge - 20,55 m3 / day 1 time per year (emptying the boiler circuit), rainwater with a flow rate of 4,47 l / s is provided for in the nearest manhole on the network yard communal combined sewer D=230 mm. Polypropylene sewer pipes D = 160-225 mm were selected for laying the combined sewerage network. Household 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 construction of domestic 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 louvre 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 the attached gas boiler house in the courtyard area, designed to replace the existing one, in normal mode is provided from the public electric networks of the centralized power supply system, according to the technical specifications. Rated power 167,2 kVA, voltage class 0,4 kV, connection points - RUNN 0,4 kV in the new transformer substation being built to replace the transformer substation 81., In emergency mode, when the ASU suddenly disconnects from the centralized power supply system, the power switches to an autonomous source - diesel - a generator set (DGU) with a capacity of 200 kVA, switched on automatically. The category of power receivers in terms of power supply reliability is the second, it is provided from two independent mutually redundant sources, power receivers of security systems (first category) with a capacity of 0,9 kVA are provided 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 a 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 non-categorized and operational personnel (solid insulation, shutdown of non-stationary processes, absence of contact voltage, etc.).