Architectural and space-planning solutions

The design documentation designed the construction of an autonomous automatic gas boiler house AKM "Signal 4000" of mass production, which, together with heating networks, is designed to supply heating, ventilation and hot water supply systems for residential quarters. Gas boiler AKM "Signal 4000" is a product of full factory readiness. The building of the boiler house is a frame, detached, one-story, without a basement and an attic, rectangular in plan, with dimensions in the extreme axes of 14,00 x 6,00 m. The mark of the clean floor of the boiler room is taken as a relative mark of 0,000. The height of the boiler room to the bottom of the protruding roof structures is 3,23 m. The maximum height of the building from the planned ground level (minus 0,500 m) to the top of the roof is 3,85 m. The production process is designed without permanent human presence. The frame is metal. The walls are made of 100 mm thick sandwich panels with mineral wool filling. The door is metal, insulated, custom-made, fireproof. The roof is flat, combined, insulated, with a roof made of rolled materials on sandwich panels 100 mm thick. The cover over the boiler room is accepted as easy-to-reset structures. The drain is external, unorganized. Floors - raised floor - corrugated perforated aluminum sheet on metal beams, the main floor - cement-concrete with a polymer coating with a slope to the ladder. To remove combustion products, a chimney with two gas outlets is designed, which is installed on its own foundation. The height of the chimney from the planning ground level (minus 0,500 m) is 22,50 m. The elevation of the top of the foundation is minus 0,20 m. The flue pipes are made of stainless steel. The surface of the wall sandwich panels is light gray with a factory-made polymer coating.

Structural and space-planning solutions

The modular boiler house is designed from metal structures with sandwich panel cladding. Metal structures are designed from a closed bent profile 80x4 according to GOST 30245-2003, the base of the module is made from I-beams 20B1 according to STO ASChM 20-93. Steel structures C245. External walls - hinged sandwich panels 100 mm thick. Covering - from a sandwich panels 100 mm thick on a metal frame. Spatial rigidity and stability of buildings is provided by vertical and horizontal connections. The foundations are taken in the form of a monolithic reinforced concrete slab 200 mm thick, concrete B15, W6, F75 on sulfate-resistant cement. Under the foundation, concrete preparation is provided with a thickness of 100 mm along a sand cushion of 900 mm and crushed stone preparation of 200 mm. Chimneys in the constructive section were not considered. Foundations for the pipe - columnar concrete B25, W6, F75 on sulfate-resistant cement. A relative elevation of 0,000 corresponds to an absolute elevation +18.35 m. In accordance with the report on engineering and geological surveys, silty gray hard sandy loams with E=190 kg/cm2, φ=30°, c=0,21 kg/cm2 serve as foundation foundations. The design resistance of the foundation soils is not lower than R=2,54 kg/cm2. The pressure on the ground does not exceed p=0,41 kg/cm2. In order to protect the concrete of underground structures from aggressiveness, the concrete grade for water resistance is W6 on sulfate-resistant cement, the concrete surface is protected by coating with bitumen twice. The expected average settlement of the building is not more than 2,1 cm. The stability of the pipe foundation is provided for the loads specified by the customer.

Engineering equipment, utility networks, engineering activities

In accordance with the technical specifications for the technological connection of electrical installations of the boiler house to electric networks, two independent mutually redundant power sources of the boiler house are the 1st and 4th sections of the RU-10kV SS220/10 kV. The connection point is in the ASU-0,4 kV boiler room. The power supply of the boiler house is provided by two mutually redundant CL-0,4 kV. The design documentation provides for the installation of a certified, mass-produced block boiler house of complete factory readiness of the “Signal 4000” type (certificate of compliance with Russian standards No. ROSS RU.ME05.N08705). 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 the event of a power failure of the boiler room from one of the sources: for power receivers of the 1st and 2nd category - automatic, by the action of the AVR device ASU-0,4 kV of the boiler room. The power supply scheme adopted in the design documentation satisfies the requirements for the reliability of power supply to consumers of the designed facility. The estimated electrical load of the boiler room is 48,4 kVA. 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. As a grounding conductor, natural grounding conductors (reinforced concrete foundations of a chimney, boiler room) and an artificial grounding conductor combined into one device are used. A steel lightning rod is installed on the chimney and connected to the earth electrode through the steel frame of the chimney. In accordance with the contract for the provision of communication services, the boiler room is connected to the existing city telephone network. The connection point is at the introductory cross-section of the boiler room. Through communication networks, the boiler room is connected 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 room. Upon receipt of an emergency signal, the dispatcher by phone sends the duty group closest to the boiler house that gave the signal. The control room and duty groups operate around the clock. The list of signals transmitted to the dispatching system: emergency: 1st and 2nd methane gas levels, 1st and 2nd carbon monoxide levels, malfunction of the gas analyzer, fire in the boiler room, unauthorized entry into the boiler room, minimum cold water pressure, minimum gas pressure at the inlet to the boiler room, shut-off gas valve closed, failure of boiler circuit pumps, lack of power from the external network, failure of all pumps; technological: temperature and pressure in the direct and return pipelines of the heating network, temperature and pressure in the boiler circuit, temperature and pressure of hot water in the direct and return pipelines; accounting: gas consumption, cold water consumption, heat generation in the heating circuit; information signals: a signal of non-normative replenishment of the heating circuit, authorized and unauthorized entry into the boiler room. Water supply and sewerage of consumers of the facility - in accordance with the specifications. Water supply to the boiler house is provided through two inputs made of PE pipes Ø 110 mm, from a previously designed intra-quarter network. According to the specifications, the inputs are laid directly into the boiler house building. At each inlet, water-measuring units are installed according to the drawings of the TsIRV 02A.00.00.00 album (sheets 268, 269) without bypass lines. Guaranteed pressure at the connection point 25 m w.c. Estimated consumption of cold water for permanent needs - 113,32 m3 / day, including: for the preparation of hot water - 108,0 m3 / day; for feeding the heating network - 5,28 m3 / day; for household needs - 0,04 m3 / day. Estimated consumption of cold water for periodic needs: for filling the boiler room - 7,0 m³ / day (1 time per year); for filling heating networks - 26,5 m³ / day (1 time per year). Networks of cold and hot domestic and drinking water supply are not provided due to the lack of personnel. An industrial water supply system has been designed for the boiler house. The required pressure for the industrial water supply system is 35,0 m of water. The plumbing system is dead end. Stainless steel pipes according to GOST 9941-81 were selected for the installation of the water supply system. Internal water fire extinguishing, due to the small volume of the building, is not provided. External fire extinguishing, with a flow rate of 10 l / s, is provided from a fire hydrant D = 125 mm, installed on a previously designed intra-quarter water supply network. Drainage from the boiler house is provided for by one outlet D = 110 mm into the previously designed well No. 159' on the intra-quarter network of a common sewage system, cooldown of the drain is provided inside the boiler room through a cooling tank. Periodic process flow - 7,0 m3 / day when emptying the boilers (1 time per year) and household flow - 0,04 m3 / day (1 time per month). PVC pipes were chosen for the sewerage device. Discharge of surface runoff from the roof and adjacent territory of the boiler house is unorganized, to the relief. Estimated rainwater runoff is 0,53 l/s. The heat supply of the projected residential quarter No. 1 is divided into 4 zones, each of which is provided with thermal energy from an individual source of heat supply - a boiler house (4 boiler houses). The project documentation under consideration was developed for the source of heat supply - boiler room No. 2 and heat networks up to the ITP of the buildings of the 2nd heat supply zone. Heat supply system from the boiler room - 4-pipe: 2D219x6,0; D108x4,0 and D89x4,0. Laying of heating networks from the boiler house to residential buildings and preschool educational institutions - underground, channelless, in impassable channels and through technical undergrounds. Branches from distribution heating networks - in thermal chambers and with the help of a tubeless tie-in. The laying of heat networks along the technical undergrounds of houses is provided taking into account the provision of evacuation passages in accordance with the requirements of regulatory documents. The diameters of heat networks are taken in accordance with the hydraulic calculation. Compensation for temperature elongations was adopted due to the angles of the route and the installation of bellows compensators. For underground laying accepted: steel pipes st.20 gr. B (GOST 10704-91) in industrial PPU-PE insulation with UEC (GOST 30732-2006), pre-insulated polymer pipes in thermal insulation made of polyethylene foam in a corrugated plastic casing "Isoproflex-A" with a diameter of DN 140 mm or less, pipes made of stainless steel (GOST 9941-81) in PPU-PE insulation. For above-ground laying, the same pipes are used in insulation from mineral wool products with a cover layer of aluminum foil. Drainage of water from heating networks is taken through bypass wells into the sewerage system. In accordance with engineering and geological surveys, the groundwater level is at a depth of 3,3 - 4,6 m, which allowed the laying of all heating networks to be accepted without associated drainage. The source of heat supply is the projected free-standing heating gas boiler house AKM "Signal 4000". The boiler room provides for the installation of two water-heating boilers: "Thermotechnician" TT100 with a capacity of 1500 kW and "Thermotechnician" TT100 with a capacity of 2500 kW manufactured by Entroros. The installed capacity of the boiler house is 4000 kW. Boiler room - 3-circuit. The first circuit is a boiler room 110–900С with a pressure in the boiler of 0,55 MPa; the second - network 95–700С; the third - hot water supply 650C. Boiler operation mode - constant temperature at the outlet of the boiler 1100C and temperature control at the inlet to the boiler 600C, provided by individual three-way control valves and circulation pumps. Connection of the heating system to the boiler circuit - according to an independent scheme through two collapsible plate heat exchangers M10-BFM of 2667 kW from Alfa Laval with two circulation pumps. To ensure weather regulation of the heat carrier temperature, the system is provided with an MHF32F control valve installed on the heating circuit, temperature sensors TP1 installed on the supply network and outdoor air GTS with an Entromatic control unit. Connection of the DHW system to the boiler circuit - according to an independent scheme through two collapsible plate heat exchangers M6-MG 1200 kW each of the same company with two circulation pumps. To maintain a constant temperature of the heat carrier, the following are provided: a three-way valve MHF32F, a temperature sensor TW2 after the heat exchanger and an Entromatic control unit. Make-up of the boiler and network circuits - from the drinking water supply after chemical water treatment.