Architectural and space-planning solutions

The designed boiler house building is two-story, rectangular in plan, without a basement, with dimensions in the extreme axes of 16,0x10,5 m. The maximum height of the building from the planning ground level to the top of the parapet is 7,34 m. The level of the finished floor is taken as a relative mark of 0,000 boiler room, corresponding to the absolute mark 6.46. The outer walls are made of three-layer sandwich panels. The covering is made of sandwich panels. The roof is rolled, the drain is external unorganized. Floor covering - aluminum sheet "lentil". The partitions of the diesel generator room are made of sandwich panels. Easy-to-reset structures are provided - roofing slabs. The chimney is designed with a height of 30,0 m from the level of the clean floor of the boiler room.

Structural and space-planning solutions

The building of the boiler house is of a normal level of responsibility, designed on the site of the boiler house being dismantled. The structural scheme of the building is a frame system of steel structures. The spatial rigidity and stability of the building is ensured by the vertical connections of the columns and the horizontal connections of the roof. The building calculation was performed using the SCAD software package, version 11.3. External walls - hinged steel three-layer sandwich panels 100 mm thick. The panels are fastened to the columns of the building frame. Columns - steel from bent closed welded square profiles. The main pitch of the columns is 2,04 x 3,5 m, 2,56 x 3,5 m, the section of the columns is 80x80x4 mm. Floor beams at elev. 0,000, +3,480 and coatings - steel from rolled profiles, section I 20 B1, channel No. 20 P, No. 12 P. Overlap at elevation. +3,480 - steel grating on steel beams. Coating - steel three-layer sandwich - panels 100 mm thick on the steel beams of the coating. Stairs - steel from rolled profiles. Territory fencing - steel lattice of square pipes. The foundation of the fence is reinforced concrete tape on a crushed stone cushion 1,35 m high. Gas exhaust shafts with a diameter of 600, 650 mm are fixed to a steel lattice exhaust tower 29,6 m high. The tower is designed from steel pipes with a section of 219x8 mm, 159x6 mm. The material of steel structures is steel C 245 GOST 27772-88. The foundations were designed based on the results of engineering and geological surveys carried out at the construction site. The foundations of the boiler house are a monolithic reinforced concrete ribbed slab 200 mm thick, ribs 400 mm thick, on a sand cushion 1600 mm thick from medium-grained sand. At the base of the sand cushion there are silty sands with characteristics e= 0,710, E= 130 kg/cm2. The design resistance of the soil is 2,1 kg / cm 2, the average pressure on the base is 0,5 kg / cm 2. Concrete preparation 100 mm thick is provided under the foundation slab for crushed stone preparation 200 mm thick. Horizontal thermal insulation is provided along the perimeter of the foundation slab. Foundation plate material - class B 15, W 8, F 75 concrete, class A III reinforcement. The foundation of the exhaust tower is a monolithic reinforced concrete free-standing column grillage 2,2 m high on piles. Piles - bored monolithic reinforced concrete with a diameter of 450 mm, a length of 26,9 m. At the base of the piles - refractory loam with characteristics e = 0,587, E = 120 kg / cm 2. The calculated load on the pile of 87 tf was taken from the results of static sounding. Pairing of piles and grillage is rigid. A concrete preparation 100 mm thick is provided under the grillage. The pile material is concrete of class B 25, W 6, F 75, the material of the grillage is concrete of class B 15, W 6, F 75, reinforcement of class A I, A III. The expected settlement of the building and the exhaust pipe is 0,6 cm. The maximum level of groundwater is at a depth of 1,2 m from the surface of the earth. Groundwater is slightly aggressive with respect to concrete of normal permeability. The project documentation provides for measures to protect underground structures from groundwater: the use of concrete of reduced and especially low permeability, paint waterproofing. The relative elevation of 0,000 corresponds to the absolute elevation of +6.46 m. ​​Technical inspection of buildings located in a 30-meter risk zone from the construction site. The existing buildings are 2-5 storey, built according to the wall structural scheme with load-bearing brick walls. According to the results of the survey and in accordance with TSN 50-302-2004, Appendix "B", the category of the technical condition of buildings is the second (2).

Engineering equipment, utility networks, engineering activities

For heat supply of systems of consumers of objects, the device of an autonomous boiler house AKM "Signal 9500" is provided. The installed capacity of the boiler house is 9,5 MW. Heat consumers belong to the second category in terms of heat supply reliability. The boiler house is equipped with three hot water boilers of the brand ENTROROS Thermotechnician TT100 with a heating capacity of 2x3000 kW each, with combined burners GKP-280H from Oilon and one boiler of the brand Entroros with a capacity of 3500 kW with a burner GKP-400H from Oilon. The estimated heat output of the boiler house, taking into account losses in the networks, will be 8,08 Gcal/h (9,37 MW), including: for heating - 6,516 Gcal/h; for hot water supply - 0,3488 Gcal/h; for the future - 1,21160 Gcal / h. The main type of fuel is natural gas with QpН = 33 kJ/m950 (3 kcal/m8000). The scheme for connecting heat networks is two-pipe. The laying of the heating network is underground. For laying the heating network, the use of steel pipes in PPU-345 insulation with a remote control system is provided. Compensation for thermal elongations is solved due to the angles of rotation and the use of bellows expansion joints. For laying pipelines of the DHW system, it is planned to use Isoproflex-A pipes in a corrugated sheath. The scheme for connecting heating systems and hot water supply systems is independent, through heat exchangers installed in the boiler room. The operation of the boiler room is in automatic mode, without the constant presence of service personnel. The heat carrier at the outlet of the boiler room is water with a temperature of 95°C. Preparation of hot water in the boiler room for the DHW system - 65°C. The boiler room provides for the installation of auxiliary equipment: network pumps of the boiler circuit: Grundfos IL 100/145-11/2 - 3 pcs. network pumps of the heat supply circuit: Grundfos IL 100/150-15/2 - 3 pcs.; plate heat exchangers of heat supply systems M15-MFM M6-FG in 2 sections, with a capacity of 8519 and 879 kW, respectively; expansion tanks - 4 pcs. (Flexson CE1000, volume 1000 l); installations for water softening based on a dosing pump TEKNA APG-603, a counter and a supply tank of reagents. To account for heat consumption, it is planned to install a heat consumption metering unit for direct and return network water. The design documentation provides for thermal insulation of heat pipelines, gas ducts and chimneys Dn = 2x600mm and 650mm, 30,0 m high, as well as thermal mechanical equipment. Gas supply of gas-using equipment of the boiler house is provided in accordance with the technical specifications. Gas consumption - 1110,05 m³/hour. The design documentation provides for the laying of an underground polyethylene gas pipeline of medium pressure Dn 125 mm from pipes PE100 SDR 17,6 in accordance with GOST R 50838-95 from the existing steel underground gas pipeline of medium pressure Du=100 mm. An AVK type gate valve is installed at the tie-in point. Laying of an above-ground gas pipeline - from steel pipes DN = 125 mm in accordance with GOST 10705-80 *. The gas pressure at the inlet to the boiler room is 0,19 MPa. To reduce the gas pressure, pressure regulators are installed in front of the burners. For commercial accounting of the amount of gas, a gas meter of the SG type is installed. At the entrance of the gas pipeline to the boiler room, the following are installed in series: thermal shut-off valve KTZ - 1 pc.; solenoid valve - 1 pc.; gas filter - 1 pc. Water supply (cold water) and water disposal of the facility's consumers is provided in accordance with the connection conditions and adjustment of the connection conditions. Water supply (HVS) is provided from the public water supply networks D = 400 mm from the side of the street. on two inputs from pipes PE100SDR17 D=110 mm. The inputs provide for the installation of water metering units according to TsIRV 02A.00.00.00 (sheets 268, 269). Guaranteed pressure at the connection point - 28,0 m w.c. Estimated consumption of cold water: for household and drinking needs - 0,02 m3 / day; for technological needs - 150,13 m3 / day; periodic needs - 143 m3 / day (filling networks and heating networks 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. Number of fire hydrants D=50 mm - 2 pcs. The required pressure for the integrated water supply system is 16,0 m of water column. The integrated water supply system is a dead-end, single-zone. Steel water and gas pipes were chosen for the construction of the drinking water supply system. External fire extinguishing is provided from fire hydrants D = 125 mm installed on public water supply networks. Water consumption for external fire extinguishing - 10,0 l / s. Drainage of household wastewater in the amount of 0,02 m3/day, periodic discharge - 20,48 m3/day once a year, rainwater with a flow rate of -1 l/s is provided for in the manhole No. 1,5 on the communal sewerage network D =126 (230) mm. Polypropylene sewer pipes D = 250 mm were selected for laying the combined sewerage network. Household sewerage systems and external drains are designed for the building. Cast-iron sewer pipes were chosen for the construction of domestic sewage systems. The heat carrier in the heating system of the boiler room is water with a temperature of 160-110°C. The heating of the boiler room is designed to maintain a temperature not lower than +90°C and is solved due to heat gains from process equipment and pipelines and the use of air-heating units. Pipelines are laid open. For the installation of the heating system, steel water and gas pipes GOST 3262-75 were selected. Supply and exhaust ventilation is provided in the boiler room, designed for a single air exchange of general ventilation in the cold season and for the assimilation of excess heat in the warm season, as well as providing the air flow necessary for fuel combustion. Air inflow for general and process ventilation is designed through louvered grilles in the outer enclosures. Air removal - through furnace devices and deflectors installed on the roof of the building. In the warm period of the year, supply ventilation is provided with natural motivation, and exhaust ventilation with mechanical and natural. When the maximum allowable air temperature in the boiler room is reached, the exhaust fan is designed to turn on automatically. In the diesel-generator room, supply and exhaust general ventilation with three-time air exchange is provided. Inflow - through the louvered grille, removal of air and combustion products - through the louvered grille and deflector, respectively. In accordance with the contract for the technological connection of the electrical installations of the boiler house to the electrical networks, the only source of power for the boiler room is the 1st section of 10 kV PS110/10 kV. The connection point is installed in switchgear-0,4 kV RTP10/0,4 kV No. 555 with two 1000 kVA transformers. The power supply of the boiler house is provided from one section of RU-0,4 kV RTP 555 along one CL-0,4 kV APvBbShp-1-4x240 with a length of 310 m. To back up the power supply to the boiler house in the event of a power failure from Substation No. 542, it is planned to install a diesel-electric power station (hereinafter referred to as DPP) SDMO J200K with a capacity of 200 kVA with an automatic start system, as well as uninterruptible power supplies (hereinafter referred to as UPS) in the control system circuits. Estimated recovery time of heat supply to consumers of the boiler house after a power outage from PS542 is no more than 5 minutes. The main consumers of electric energy of the boiler house are: network pumps, recirculation pumps of the boiler circuit, burner fans and fuel pumps of boiler units, cold water booster pumps, control system. With regard to the reliability of power supply, the complex of electrical receivers of the boiler house belongs to the second category; fire, security alarm, gas analyzer, control and dispatching system of the boiler room - to the first category. Restoration of power in case of power failure of the boiler house from PS542: for power receivers of the 2nd category - automatic, after starting and reaching the operating mode of the diesel power plant of the boiler house; for electrical receivers of the 1st category - automatic from built-in UPS. The estimated electrical load of the boiler room is 126,3 kVA. The power supply scheme adopted in the design documentation does not meet the requirements for the reliability of power supply to consumers of the designed facility in accordance with clauses 1.2.19, 1.2.20 of the rules for the installation of electrical installations (PUE are not included in the list of national standards and codes of practice, approved by order of the Government of the Russian Federation of 21.06.2011. XNUMX and are not mandatory), but approved by the Energy and Engineering Committee. For distribution networks, the cable type VVG, NYM is selected. All cables and wiring (starting from the ASU) in three-phase networks are five-core, in single-phase networks they are three-core. The equipment of switchgears and electric networks was checked for long-term permissible load, for the time of disconnection of the damaged section of the circuit by protection devices, for voltage losses, for heating, for short circuit mode. The security system was adopted by TN-CS with a device at the input to the boiler room for re-grounding the neutral conductor and the main potential equalization system. The PE VRU-0,4 kV bus is used as the GZSH. An artificial ground electrode (10 electrodes connected by a 50x5 steel strip) with a DC spreading resistance of 3,814 Ohm is used as a ground electrode. The generator neutral, lightning protection, GZSH are connected to the ground electrode. A steel lightning rod is installed on the chimney and connected to the ground electrode with a 50x5 steel strip. For commercial metering of electrical energy, single-tariff electricity meters Mercury 230 ART-03 are installed. In accordance with the contract for the provision of communication services with the boiler room, it is connected to the existing city telephone network with a cable KSPP 1x4x0,9. The connection point is installed in the junction box No. 76A-1 of house 75. Communication networks are used to connect the boiler house to a single dispatching system. The main communication channel is wired, the backup is a radio channel (GSM / GPRS modem); the system automatically selects a communication channel with priority on the wired Internet. Emergency and technological (including accounting and information) signals are automatically transmitted to the control center via communication channels. Upon receipt of an emergency signal, the dispatcher sends the duty group closest to the boiler house that gave the signal.