Scheme of the planning organization of the land plot

 The site allotted for the construction of the boiler house is located in the zone of development and economic activity regulation. The site is limited: from the north, south and east - by the territory of residential buildings; from the west - a section of the motor depot. On the site there are two metal buildings of the existing boiler house, metal warehouses, tanks to be dismantled. Existing utilities - medium-pressure gas pipeline, sewerage, heating mains, electrical cables - are subject to dismantling or transfer. The relief of the site is relatively flat, the absolute elevations vary within 3.82-3.94 m. The entrance to the boiler house building is organized from the side of the avenue along the existing intra-block passage, the possibility of passage of fire equipment in accordance with regulatory requirements is provided. The design solutions provide for the improvement of the territory: the installation of an asphalt concrete pavement for the passage and a platform near the boiler house, the restoration of the asphalt concrete pavement for public driveways that was disturbed during the laying of utilities. The organization of the relief is made taking into account the architectural and planning solution for the development of the site, the existing position of the adjacent territory, the design features of the designed building and the conditions of surface drainage into the existing and planned storm water wells.

 Structural and space-planning solutions

The modular boiler house is designed from easily assembled metal structures with "sandwich" paneling. Metal structures (columns) are made of a closed bent profile 120x80x4, etc. (connections from a bent profile 80x4) according to GOST 30245-2003. Roof beams from an I-beam 35B1 STO ASCHM 20-93. Steel C245. The outer walls are hinged "sandwich" panels 100 mm thick. The coating is made of a profiled sheet (with insulation) along the runs. Spatial rigidity and stability of buildings is ensured by vertical connections and a hard disk of the coating. The foundations are taken in the form of a monolithic reinforced concrete slab 250 mm thick, concrete B15, W6, F75. Under the foundation, concrete preparation is provided with a thickness of 100 mm on a sand cushion with a thickness of 1450 mm. The chimney (2 exhaust stacks with an outer diameter of 700 and 750 mm and one stack Ø350 mm) ~30m high is fixed on a spatial metal structure, installed on its own foundation. The metal structures of the chimney are made of racks (pipe with a diameter of 168x4, 114x4) united by a lattice of 89x4 pipes. The foundations for the pipe are columnar from monolithic reinforced concrete. Concrete B15, W6, F150. The relative elevation of 0.00 corresponds to the absolute elevation of +4,15 m. According to the report on engineering-geological surveys, sands of medium density with E=110 kg/cm2, φ=26, epeski=0,75 serve as the base of the sand cushion. The design resistance of the foundation soils is not lower than R=1,9 kg/cm2. The pressure on the ground does not exceed p=0,7 kg/cm2. The maximum level of groundwater is at a depth of 0,5 m. Groundwater is slightly aggressive towards 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 W6, the concrete surface is protected by coating with bitumen twice. The expected average settlement of the building is no more than 3,8 cm. The stability of the pipe is ensured. A survey of the surrounding buildings has been completed. The expected settlement of the surrounding buildings is less than the maximum allowable values. The project provides for the organization of observations (monitoring) of the surrounding buildings.

Engineering equipment, utility networks, engineering activities

The maximum calculated heat load on the designed boiler house with hot water supply max / sr is 6,406 / 5,563 Gcal / h. The source of heat supply is a projected heating stand-alone boiler house, the construction of which is provided for on the site of the existing boiler house with a chimney that is being dismantled. The design documentation provides for the construction of a boiler house building on the site of the existing boiler house building to be dismantled. The building is one-story, rectangular in plan, with dimensions in the extreme axes of 16x8 m. The height of the building from the planning mark of the ground to the top of the parapet is 4,51 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 4.15. The building has a boiler room and a diesel generator room. The outer walls are made of three-layer sandwich panels. The covering is single-pitched, made of profiled flooring with insulation. The roof is rolled, the drain is external organized. Floor covering - ceramic tiles. The partitions of the diesel generator room are made of sandwich panels. Window blocks - metal-plastic with single glazing. Window glazing at the rate of 0,03 m² per 1 m³ of the building volume is accepted as easily dropped structures. The boiler house has three water-heating boilers, of which - two three-way steel low-temperature water-heating boilers of gas-pipe type "Thermotechnik" TT100 with a capacity of 4200 kW and 3500 kW from Entroros, equipped with combined modulating burners GKP-400 M-1 from Oilon; and the third one is a two-way steel low-temperature water-heating gas-tube type boiler - "Thermotechnik" TT50 with a capacity of 450 kW of the same company, equipped with a combined modulating burner GKP-50N from Oilon. The installed capacity of the boiler house is 8150 kW, 7,0 Gcal/h. The main fuel is natural gas. In accordance with the Customer's Task, reserve and emergency fuel is not provided. The category of reliability of heat supply to all consumers of thermal energy is the second. The boiler house belongs to the second category in terms of reliability of heat energy supply to consumers. The ENTROMATIC control system unit included in the boiler delivery set ensures automatic cascade control of boiler operation. Individual boiler control cabinets, equipped with automation and control systems based on Kontar controllers, together with the burner, control the operation of the boilers. Operating parameters of boilers: water temperature Т1/Т2=105/750С; coolant pressure in the boiler - 3,1 bar. Three-circuit boiler room. The first circuit is with a boiler temperature of 105–750С. The second circuit - heating and ventilation systems (95-700C), is connected to the boiler circuit according to an independent scheme through two plate heat exchangers of 50% power (3094 kW) from Alfa Laval. Regulation of the heat carrier temperature according to the temperature chart - by the Contar controller, a three-way control valve and temperature sensors of the heat carrier and outside air. The hot water supply system (third circuit) is connected to the boiler circuit according to an independent scheme through two heat exchangers of 100% power (981 kW each). Maintaining the temperature of the coolant (650C) constant - by the controller "Contar", the three-way valve V321 of the company "TAS" and the temperature sensor on the coolant. Make-up of the boiler circuit and the circuit of heating and ventilation systems is provided from the household. drinking water supply from preliminary water treatment using the SLS 0844 TW softening system and adjusting the pH level to eliminate corrosion by dosing the reagent (ADVANTAGE K 350) in a SEKO installation. Protection of hot water boilers is provided by automatic shutdown of fuel supply in case of: increase or decrease in gas pressure in front of the burners; lowering the air pressure in front of the burners; reduction of vacuum in the furnace; extinction of the torch burners; increase in water temperature at the outlet of the boiler; protection circuit failures, including power failure. Removal of combustion products - through heat-insulated individual gas ducts and chimneys made of stainless steel Du650; 600 and 250 mm, height 30 m. The heating and ventilation system envisaged by the project provides the indoor temperature not lower than +50С and supply ventilation at the rate of 3-fold air exchange and the air necessary for fuel combustion. Three air heaters KSK 2200-1800-1350KhLZM are provided for heating the supply air coming through two louvered grilles (950x3 mm and 11x02 mm). GSV. The gas pressure at the inlet is 0,11 MPa. At the inlet of the gas pipeline, the following are installed in series: thermal shut-off valve KTZ-001; gas filter FN6-1; gas electromagnetic shut-off valve "EVPS / NC" company "MADAS"; ball valve gas for soft start - KShTVG-125f; commercial gas consumption metering unit based on RVG G400 gas meter with electronic gas volume corrector Logic 761.2, complete with temperature and pressure sensors. On the branches to the boilers are provided: fittings, gas filters; LNG flow stabilizers 100-30; gas meters SG16MT-400 for two boilers and SG16MT10 for a boiler 0,45 MW; regulators type RMG 330 (seat 33, spring 90-200 mbar) with built-in slam-shut for two boilers (to reduce gas pressure from 0.11 MPa to 12 kPa) and type RMG 300 (seat 11, spring -30-100 mbar) with built-in slam-shut for the boiler 0,45 MW; - safety relief valves - PSK - type FRS BV 10 10 25 R1; bellows expansion joints. The burner is supplied with: a double gas magnetic valve DMVD with a maximum and minimum gas pressure switch and a tightness control device; a servo drive for regulating the air supply to the burner ventilation system, an automatic burner operation control system, an operation safety system that provides the necessary algorithms for ignition, boiler shutdown (purge, blocking) and boiler performance control. The boiler room is provided with a two-threshold system for protecting the premises from gas pollution by methane and carbon monoxide. GOS. Gas consumption for installed capacity - 957,3 m3/h. In accordance with the Specifications for gas supply, the connection point is on a medium-pressure steel gas pipeline (0,11 MPa) D325 mm, laid along the prospectus. In accordance with the gas supply scheme, the project provides for a tie-in into the gas pipeline along the avenue by a designed steel gas pipeline DN100 mm with the installation of a valve DN125 mm from AVK, followed by a transition to PE / ST and laying a polyethylene gas pipeline DN125 mm using the HDB method. Further - underground laying in an open way to the exit from the ground near the boiler building with a transition to a steel gas pipeline DN100 mm and laying it along the facade before entering the boiler room with the installation of KSHI before entering. Pipes for underground laying - PE 80 GAZ SDR 11-125x11,40 GOST R 50838-09 with a safety factor of 2,8; for above-ground laying - straight-seam electric-welded steel pipes St10-15 GOST 10704-91 and GOST 1050-88 in "very reinforced type" insulation. Heating network. In connection with the change in the source of heat supply, the project provides for the reconstruction of existing heating networks and thermal chambers. Heat supply system from the boiler room - four-pipe - 2Du250; DN140 and DN50. Coolant - T1 / T2 - 95-700C; T3/T4-60/40-500C. The laying of heat networks from the boiler house is underground, channelless, in impassable channels under the carriageway and in the basements of buildings. Descent of water from heating networks - through thermal chambers and from the lower points of the route of heating networks. The method of laying heating networks is open. Compensation for temperature elongations - calculation of the angles of the route. Pipes for underground laying: for heating networks of heating systems with a diameter of 200 mm and more - steel electric-welded according to GOST 10704-91 in PPU-PE insulation according to GOST 30732-06; pipes with a diameter of DN160 and less, including for hot water supply systems (T3 / T4) - made of cross-linked polyethylene in PPU-PE insulation - Isoproflex A). Pipes for above-ground laying in thermal chambers and in the cellars of buildings: electric-welded steel according to GOST 10704-91 in insulation from mineral wool products with a cover layer of aluminum foil according to GOST 30732-06 with a diameter of 200 mm and more; with a diameter of less than 160 mm - made of cross-linked polyethylene in polyurethane foam insulation - ISOPROFLEX A; pipes of hot water supply systems - steel from stainless steel in accordance with GOST 9941-81 in insulation from mineral wool products with a cover layer of aluminum foil. Water supply and sewerage of consumers of the facility in accordance with the specifications for water supply, and UE for networks. Water supply is provided from two water inlets D = 150 mm per house. The project does not provide for the replacement of house inputs, connection on a tee before entering the building of house 73, then in transit through the basement of the house and the courtyard to the boiler room. Water supply to the boiler room through two inlets made of PE pipes D = 110 mm. The inputs provide for the installation of water metering units according to TsIRV 02A.00.00.00 l.38,39, without a bypass line with a meter Du = 50 mm. Guaranteed pressure at the connection point - 28,0 m of water. Art. Estimated consumption of cold water for permanent needs - 118,34 m3 / day, including: for household and drinking needs - 0,04 m3 / day; for technological needs - 117,94 m once every 3 days). Water for irrigation of the territory is not provided. Estimated consumption of cold water for periodic needs: for filling heating networks - 105,14 m3 / day (1 time per year) and for filling the boiler room 17,0 m3 / day (1 time per year). The building provides for a system of integrated dead-end production and fire water supply B0. The required pressure for production needs (up to the booster pumps specified in the ТМ section) is 27,7 m of water. Art. The required pressure for fire fighting needs is 18,75 m of water. Art. The pressure is provided by the pressure in the utility network. Galvanized steel pipes according to GOST 0-3262 * and GOST 75-10704 were selected for the installation of the B91 water supply network. External watering taps are not provided. Hot water supply is not provided. Water consumption for internal fire extinguishing - 5,0 l / s (2 jets of 2,5 l / s). Number of fire hydrants D = 50 mm, 2 pcs. External fire extinguishing, with a flow rate of 10 l / s, is provided from a fire hydrant D = 125 mm, installed on the public water supply network along pr. The sewerage of the boiler house is provided for one outlet, through a cooler well with a settling depth of at least 0,5 m. Sewer networks are not provided inside the boiler house building; The external network is provided from two-layer corrugated PP pipes D = 160/139 mm. Drainage is provided for in the well on the network of the yard combined sewer D = 250 mm, located in the courtyard of the house. The nature of the effluents is periodic and is: during the regeneration of filters - 0,4 m3 / day (1 time in 2 days); when emptying the boiler system - 17,0 m3 / day (1 time per year). Constant consumption when washing floors - 0,04 m3 / day. The discharge of surface runoff from the roof and the territory of the boiler room is carried out to the existing storm water well on the network of the yard combined sewer, located in the courtyard of the house and to the designed DK1 connected to the designed network of the combined sewer from the boiler room. The estimated rainfall flow is 0,76 l/s. The power supply of a separate-standing gas boiler house in the courtyard area, designed to replace the existing one, is provided in the normal mode in accordance with the specifications, from the public electric networks of the centralized power supply system from - TP 4033. An autonomous diesel generator is provided as a second independent mutually reserving source. 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 110 kV∙A, which is switched on automatically. The estimated power of the electrical receivers of the boiler house is 87,2 kV∙A, the category of electrical receivers in terms of power supply reliability is the second, it is provided from two independent mutually reserving sources according to the mode of the first category. The DGU is installed in a separate room in a common building with a boiler room. The grounding device of the boiler house and DGU consists of a common artificial external ground electrode and a natural ground electrode - the foundations and the floor of the boiler house building, the calculated value of the transient resistance is significantly lower than the value of the generator neutral normalized for grounding.