Architectural and space-planning solutions

The design documentation provides for the construction of a new automated boiler house within the area of ​​the old boiler house being dismantled. The existing free-standing chimney is also to be dismantled and a new chimney is to be built. The designed building of the boiler house is one-storey complex in terms of U-shaped irregular shape. Along axis 1 and axis 5, residential buildings adjoin the boiler house building. In the building of the boiler house, the following are designed: a boiler room and a diesel generator room. The maximum dimensions of the building in the coordination axes are 21,01x17,54 m. The maximum height of the boiler house building from ground level to the roof ridge is 6,87 m, to the top of the mouth of the gas ducts - 28,65 m. External walls are finished with Kraspan Color Minerit decorative panels. Interior decoration of the building in accordance with the functional purpose. Roof - pitched, multi-level, partially - gable, with a roll coating. Drainage from the roof - external unorganized. Metal insulated doors are provided to enter the building. Windows - fiberglass with single glazing. The technological process eliminates the need for the presence of service personnel.

 Structural and space-planning solutions

In accordance with technical surveys, the existing building was built in the 60s of the XX century according to a mixed design 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. The depth of foundations is 1,8 ÷ 2,10 m, the width of the base is 690 ÷ 1140 mm. At the base of the foundations lie silty sands of medium density. The technical condition of the foundations is limited workable. The building was designed according to a mixed constructive scheme. The outer walls are load-bearing brick, 380 mm thick, brick grade KORPO 1NF/100/2.0/50/GOST 530-2007 from the side of existing buildings made of aerated concrete grade D600, V3.5. The project provides for the insulation of external walls with the Kraspan ventilated facade system (TS 3024-10). Partitions made of sandwich panels 100 mm thick. Columns - metal from I-beams 25K1. The pitch of the columns is variable. Covering - soft roofing on profiled sheet SKN-157 on metal beams from I-beams 20Sh1÷40Sh1. The rigidity and stability of the building is ensured by the joint work of the longitudinal and transverse walls, vertical and horizontal connections. The foundations of the boiler house are strip, existing and new reinforced concrete, on which a monolithic reinforced concrete slab 250 mm thick, concrete B25, W4, F150, is laid. The project provides for strengthening the existing brick base of the chimney by installing a metal clip from the corners. In the upper part of the basement, a monolithic reinforced concrete head 600 mm thick is arranged, on which a new chimney will be installed. Concrete head B25, W4, F150. The exhaust tower with three gas ducts is rigidly attached to the foundation. The stability of the tower is provided by guys. The metal structures of the exhaust tower are designed from racks (pipe with a diameter of 219x6), united by a lattice of 89x4 pipes. Steel 255. The relative elevation of 0.00 corresponds to the absolute elevation of +7,33 m. In accordance with the report on engineering and geological surveys, the foundations are based on silty sands of medium density saturated with water with E = 110 kg / cm2, φ = 26, c = 2 kPa . The maximum groundwater level is at a depth of 1,0 m. Groundwater is non-aggressive to concrete of normal permeability. In order to protect the concrete of underground structures, the surface of the concrete is protected by coating with bitumen for 2 times. The expected average settlement of the building is not more than 3,1 mm. In accordance with the technical conclusions, the following fall into the risk zone: One-story building (transformer substation), 6-storey residential building, 4-storey residential building, 4-storey residential building, 5-6-storey residential building, 5- 6-storey residential building, 4-storey residential building, one-story public building, 3-4-storey residential building, 5-7-storey residential building, garage ~ 21,6 meters from the projected boiler house. The expected additional settlement of the surrounding buildings is less than the maximum allowable values. All buildings belong to the second category of technical condition, with the exception of the garage (category 1 technical condition).

 Engineering equipment, utility networks, engineering activities

For the heat supply of buildings, an automated, gas-fired, attached heating gas boiler house was designed, located on the site of the existing boiler house with eleven Tula-3 boilers. According to the degree of explosion and fire hazard, the boiler room belongs to category "G". The installed capacity of the boiler house is 9,524 MW. Facade glazing is provided as easy-to-reset structures at the rate of 0,03 m2 per 1 m3 of the volume of the boiler room. Heat consumers belong to the second category in terms of heat supply reliability. Four hot water boilers are installed in the boiler room: two brands Termotekhnik TT100-3000 with a heat output of 3000 kW each with Oilon GKP-280M burners; one brand Termotekhnik TT100-3500 with a heat output of 3500 kW with Oilon GKP-400M-1 burners and one brand Logamax U032 with a heat output of 24 kW for hot water preparation in the summer. The estimated heat output of the boiler house, taking into account losses in the networks and auxiliary needs of the boiler house, will be 8,667 MW, including: for heating - 7,5909 MW; for hot water supply - average - 0,05 MW; for prospective connection - 0,32564 MW; for losses in heat networks - 0,558 MW; auxiliary needs of the boiler house - 0,143 MW. The main type of fuel is natural gas QpН = 33520kJ/m3 (8000 kcal/m3). The scheme for connecting heat networks intended for transporting the coolant to heating systems is independent through heat exchangers, to the DHW system of GDOU Kindergarten No. 23 is independent, through capacitive heaters. 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 maximum water temperature at the outlet of the boilers is 115°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 in the boiler circuit, expansion tanks with a volume of V = 1500 l are provided; V=1000 l; V=200 l, and V=12 l - on make-up. Auxiliary equipment is installed in the boiler room: individual pumps of the boiler circuit IL100/250; network circuit pumps IL150/335; booster pumps - MVI 404; plate heat exchangers M15 BFG - 2 pcs., 5780 kW each; capacitive heaters of the DHW system Reflex 400 l SB 400 - 2 pcs.; chemical water treatment unit with Advantage K350 reagent dosing system and Veocrosol-carbon. To account for the consumption of thermal energy, it is planned to install a metering unit for the consumption of thermal energy based on electromagnetic flow meters. To remove combustion products, metal individual gas ducts and chimneys were designed with a height of 28,5 m from the floor of the boiler room, with a diameter of 500 mm for Termotekhnik TT100 boilers and a diameter of 60 mm for a Logamax boiler. The temperature of the outgoing flue gases is 190°C. The design documentation provides for thermal insulation of heat pipelines, gas ducts and equipment. Reserve fuel supply is not provided. 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 133 mm, laid to a closing boiler house. For gas supply to the boiler house, it is planned to lay an underground steel gas pipeline of medium pressure with a diameter of 133 mm and 159 mm and a polyethylene PE80 GAS SDR11 with a diameter of 160 mm to the exit from the ground at the facade of the boiler house, laying of an above-ground medium pressure gas pipeline with a diameter of 159 mm to the boiler house installed on the facade of the building, low-pressure steel gas pipeline with a diameter of 273 mm from the ShRP to the entrance to the boiler room. Gas pressure at the connection point - 0,11 MPa. The gas pressure at the inlet to the boiler room is 4,85 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 of the SG16MT-1600-R-3 type is installed. The maximum gas consumption is 1168,5 m3/h. At the entrance of the gas pipeline to the boiler room, the following are installed in series: thermal shut-off valve KTZ200-1,6; gas filter series FN10-1; solenoid valve series EVPS13 108. To improve the reliability of power supply to the boiler plant, it is planned to install a diesel generator "SDMO J165 Nexys Silent" in a separate room. From the building of the boiler plant for heat supply to consumers, heat networks are designed. Parameters at the connection point: Р1=45,0 m of water. Art., Р2=30,0 m aq. st, P3=35,0 m aq. st, P4=29,0 m aq. st Т1=95°С, Т2=70°С, Т3=65°С. The connection point is the collector of the boiler room. Laying of pipelines of the heating network - underground, 4-pipe, in channels and cases when approaching buildings and at the corners of the pipelines 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. With pipeline diameters of 110 mm or less, for underground laying, Isoproflex A pipelines in PPU insulation were selected. Corrosion-resistant steel pipelines and Ekoplastik polypropylene pipes were selected for laying DHW pipelines along the technical underground. Compensation of thermal elongations is provided due to the angles of rotation of pipelines of the heating network and bellows compensators. The device of thermal chambers is provided in the places of branching of pipelines during underground laying. Water supply and sanitation - in accordance with the conditions of connection. Water supply (cold water) for consumers of the facility is provided through two water inlets with a diameter of 110 mm from the public water supply network with a diameter of 169 mm. For laying water inlets, polyethylene pipes were selected according to GOST 18599-2001 and stainless steel (networks transit through the basement of a residential building). The designed inputs provide for the installation of water metering units according to the drawings TsIRV 02A.00.00.00 album sheets 192, 193 without a fire-reserve line. Guaranteed pressure at the connection point - 28 meters of water column. Cold water consumption - 25,42 m³/day, including: for feeding heating networks - 22,08 m³/day; for filter regeneration - 1,65 m³ / day (1 time in 2 days); provision of hot water supply - 1,60 m³ / day; wet cleaning - 0,09 m³ / day. Periodic needs: for filling heating networks - 122,86 m³ / day (1 time per year); for filling the boiler room system - 14,00 m³ / day (1 time per year). A separate water supply system has been designed for the facility. The required pressure for technological needs (for booster pumps) is 24,64 meters of water column. The scheme of the water supply system is a dead-end, with a banding of two inputs. Stainless steel pipes according to Aisi 304 were selected for the construction of the technological water supply system (before the booster pumps). For the installation of a fire-fighting water supply system, galvanized steel water and gas pipes were selected according to GOST 3262-75. Water consumption for internal fire extinguishing 2 x 2,6 l / s. The number of fire hydrants with a diameter of 50 mm - 2 pcs. The required pressure for the internal fire extinguishing system is 21,14 meters of water column. External fire extinguishing is provided from the existing fire hydrants No. 81a, No. 172a on the public water supply network with a diameter of 169 mm. Water consumption for external fire extinguishing - 10 l / s. Removal of domestic wastewater in the amount of 0,09 m³/day, process effluents from filter regeneration in the amount of 1,65 m³/day (1 time in 2 days), from the boiler circuit drain in the amount of 14 m³/day (1 time per year) one outlet is provided for the designed technological network with connection to well No. 114 a on the network of the yard combined communal sewerage network with a diameter of 250 mm. At the outlet from the boiler house, the installation of a cooler well and a well with a shutter is provided. The drainage of rainwater from the roof and the adjacent territory with a flow rate of 5,3 l / s is provided for in the existing storm water well No. 115 and on the network of the yard combined communal sewerage system with a diameter of 250 mm. Polyethylene pipes according to GOST 18599-2001 with a diameter of 160 mm were selected for laying the sewer network. An industrial sewerage system has been designed for the facility.  Cast iron sewer pipes according to GOST 6942-98 were selected for the installation of the industrial sewerage system. The power supply of the boiler house is provided in accordance with the technical specifications. The power allowed for connection is 128,7 kW according to the III category of reliability. Power source - PS-542. The point of connection to the network is 0,38 kV switchgear of a new transformer substation (BKTP), which is being built instead of transformer substation-66 and transformer substation-67. The required category of power supply for the electrical receivers of the boiler room is II. As a second source of power supply, in accordance with the terms of reference, a stationary diesel generator set SDMO-J165K Nexys Silent (150 kVA) is provided. Redundant power supply of the automatic control and dispatching system is provided from an independent source - UPS (battery - 1,5 kVA). The estimated recovery time of heat supply to consumers of the boiler house after a power outage from PS-542 is no more than 5 minutes. The estimated load of the boiler room is 95,35 kW. To connect a new transformer substation (BKTP) to switchgear-0,38 kV, laying of a cable of the APvBbShp-1 kV brand is provided; with a section of 4x150 mm2 from the ASU (main main switchboard) of the boiler house. The cable cross section was checked for long-term permissible load, voltage loss, the condition for disconnecting the damaged section at a single-phase short-circuit current. Consumers of electric power of the boiler house are: electrical receivers of technological equipment, network and circulation pumps, hot water boilers, instrumentation, electric motors of ventilation systems, working, emergency lighting; fire alarm devices; means of communication and dispatching. For the distribution of electricity and protection of electrical networks, the device of the main switchboard of the ASU-0,4 kV (MLS) is provided, completed on the elements of f. "ABV", with automatic input reservation device (AVR). To account for the consumed electricity at the inputs of the ASU and D-G, electronic meters "Mercury 230" are provided. Industrial luminaires with fluorescent lamps were chosen to illuminate the industrial premises. To illuminate the area, NBU50 type luminaires with metal halide lamps are provided, which are installed on the facade of the boiler house building. For the installation of distribution and group electrical networks, cables of the VVGng (A) - LS brand are provided. The security system is adopted of the TN-CS type with a device at the input to the boiler room for re-grounding the neutral conductor and the main potential equalization system. Protective grounding of electrical equipment is provided by an independent wire from the main switchboard, together with the supply wires. A potential equalization system is provided by combining on the main grounding bus (GZSH) conductive parts: busbars MSB (PE), steel pipes of building communications, metal parts of building structures, lightning protection. The PE VRU-0,4 kV bus was adopted as the GZSH. Natural grounding conductors (reinforced concrete foundations of chimneys, boiler house) and artificial grounding conductor, combined into one device, are accepted as a grounding conductor. In order to organize a communication channel for transmitting automation signals, in accordance with the contract, it is planned to lay a cable of the PRPPM 2x0,8 brand. Connection point: box No. 2b (РШ-764-29, dp 25). For security and fire alarm systems, the installation of Orion integrated security system equipment is envisaged. As the control equipment, it is planned to install: the S2000M control and management panel, the S2000-Adem radio detectors connection controller, the S2000-KPB start-up BKP unit, the S2000-ASPT PPKUASPT control and control device for automatic fire extinguishing equipment , PPKOP "S2000-4", signal-starting block "S2000-SP1 version 01". To transmit signals to the monitoring station panel, the installation of the ARKAN device is provided. To automate the operation of the boiler house, it is planned to install control panels based on Kontar programmable logic controllers manufactured by MZTA and sensors manufactured by Termokon. For dispatching the operation of the boiler house, it is planned to install a Beckhoff CX1010 controller and transfer information to the central control room via an ADSL communication channel. A GSM modem was selected as a backup communication channel. The transmission of the following information to the control room is provided: emergency signals in the technological part of the boiler room, a signal about the position of the shut-off valve at the inlet to the boiler room, boiler room gas contamination signals, boiler room security and fire alarm signals, boiler room operating parameters Heat carrier in the heating system of the boiler room and diesel generator room - 45% propylene glycol solution with a temperature of 95-70°C. The heating of the boiler room is designed to maintain a temperature not lower than +5 ° C and is solved due to heat gains from process equipment and pipelines and the use of heaters. For heating the diesel generator room, it is planned to install a panel radiator with a thermostat.