Architectural and space-planning solutions

The design documentation developed the construction of an automated gas boiler house, with 100% dismantling of the existing boiler house. The operation of the boiler room is provided in automatic mode and does not require the constant presence of maintenance personnel. The degree of fire resistance of the building is III, the class of fire hazard is CO, the category for explosion and fire hazard is G. The boiler room is designed for heat supply of heating, ventilation and hot water supply systems for residential, office buildings and social facilities. As a heat source, an automated boiler plant AKM "Signal 10000" with a thermal power of 10000 kW, mass-produced by ENTROROS LLC, was adopted. The building of the boiler house under construction is installed on the site of the boiler house being dismantled. The automated modular boiler house AKM "Signal 10000" is a supporting structure consisting of a metal frame sheathed with three-layer sandwich panels with mineral wool insulation. The building is a one-story building modular structure without a basement and an attic, rectangular in plan with dimensions of 21,20x9,0 m, the height of the building from the mark of the adjacent territory to the top of the parapet is 4,53 m (the mark of the adjacent territory is -0,500). For relative elev. 0.000 is the mark of the clean floor of the boiler room, which corresponds to the absolute mark. 7.40, adopted in the Baltic system of heights. The exit from the boiler room is provided directly to the outside. Pipe top elevation +30,000. Easily dumped design - a roof area of ​​184,8 m². The 30 m high chimney is a spatial structure consisting of two non-bearing flue pipes with a diameter of 650 mm and one with a diameter of 600 mm, and a supporting spatial metal structure.

Structural and space-planning solutions

In accordance with technical surveys, the existing building was built in 1956 according to the wall structural 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 prefabricated reinforced concrete pads and foundation concrete blocks. The depth of foundations is 2,67 m, the width of the base is 600 mm. At the base of the foundations there are dense silty sands with E=300 kg/cm2, φ=34°, e=0,531. 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 modular boiler house is designed from easily assembled metal structures (6 interlocked block modules) with sandwich panel cladding. Metal structures are made of a closed bent profile 80x4, etc. (connections from a bent profile 60x4) according to GOST 30245-2003. External walls - hinged sandwich panels 100 mm thick. The coating is made of sandwich panels 100 mm thick on a metal frame. Spatial rigidity and stability of the building is provided by vertical and horizontal connections. The calculation of load-bearing structures was carried out on a computer using the SCAD 11.1 program. The foundations of the boiler house are existing strip foundations, on which a monolithic reinforced concrete slab 300 mm thick, concrete B15, W8, F75, is laid. A 100 mm thick concrete preparation is provided under the slab. A chimney 30 m high (2 flues with an outer diameter of 650 mm and one flue with a diameter of 600 mm; they are fixed on a spatial metal structure of an exhaust tower installed on a separate foundation). The foundation for the pipes is piled. Bored piles with a diameter of 350 mm and a length of ~17,5 m, concrete B25, W8, F75. Grillage - columnar made of concrete B25, W8, F75. The calculation of foundations was carried out on a computer using the program "Foundation" and "Slab". The relative elevation of 0,000 corresponds to the absolute elevation of +7.40 m. In accordance with the report on engineering and geological surveys, the design soil resistance of the boiler house foundation is not lower than R=2,65 kg/cm2. The pressure on the ground does not exceed p=1,1 kg/cm2. The piles are based on plastic sandy loam with IL=0.5, φ=22, c=24 kPa, E=11 MPa. The bearing capacity of piles (69,4 tf) was determined according to static sounding data. Efforts in piles are not more than 57,5 tf. In order to protect the concrete of underground structures from the aggressiveness of groundwater, the concrete grade is W8. The expected average settlement of the building is not expected, since the designed building is lighter than the demolished one. The draft of the exhaust tower is not more than 5 mm. The stability of the exhaust tower is ensured.

Engineering equipment, utility networks, engineering activities

In accordance with the approved and agreed list of consumers with heat loads subject to heat supply from the designed boiler house, the total maximum demand for heat energy is 4,999+1,6874=6,6864 Gcal/h. The same, taking into account losses in networks of 7% - 7,154 Gcal / h, including for heating with ventilation - 5,769 Gcal / h with losses in networks - 6,173 Gcal / h; for hot water supply - 0,874 Gcal, with losses in networks - 0,935 Gcal / h; technological loads - 0,043 x 1,07 \u0,046d 4 Gcal / h. The heat supply system from the boiler house is 1-pipe. Depending on the location of buildings with heat-consuming systems relative to the boiler house, four outlets of heat networks are accepted: 7st outlet - to 2,7524 houses with total heat loads - heating systems with ventilation - 1,07x2,945 = 478 Gcal / h and DHW - 1,07x0,511= 2 Gcal/h; 16nd release - to 2,373 houses - 1,07x2,539 = 3 Gcal / h; 1rd issue - for 0,102 house - 1,07x0,109 \u4d 1 Gcal / h; 0,542th issue - for 1,07 house - 0,580x1,39 \u1,07d 1,487 Gcal / h, for hot water supply - XNUMXxXNUMX \uXNUMXd XNUMX Gcal / h. Laying of the designed heating networks along all outlets from the boiler house - combined, mainly along existing routes - underground in impassable channels, channelless and in the basements of existing houses. Pipe diameters are taken in accordance with hydraulic calculations. Compensation for temperature elongations - due to the angles of rotation of the route with fixed supports and the installation of bellows compensators. Drainage of water from heating networks into sewerage - through drain wells. Pipes for underground laying: longitudinally welded steel (GOST 10704-91) st.20 in industrial PPU-PE insulation with ODK (GOST 30732-2006); flexible heat-insulated pipes Isoproflex A. thermally insulated from foamed polyurethane with a protective corrugated polyethylene sheath. For above-ground laying, electric-welded steel pipes st.20 (GOST 10704-91), thermally insulated with mineral wool products with a cover layer of fiberglass, were selected; stainless steel according to GOST 9941-81; made of polypropylene PP-R80 with thermal insulation made of mineral wool with a cover layer of glass fiber. The method of laying heating networks is open. The laying of pipes in the basements of houses is accepted mainly along existing routes, taking into account the provision of emergency exits. In accordance with the long-term target program for the construction and reconstruction of thermal power facilities until 2025, as well as in accordance with the Design Assignment, the thermal capacity of the designed boiler house is 10 MW. The boiler house is equipped with three water-heating boilers Termotekhnik TT 100 manufactured by Entroros LLC, of ​​which two boilers have a thermal power of 3500 kW each, one boiler - 3000 kW. The installed capacity of the boiler house is 10 MW. Fuel is natural gas. In accordance with the letter, the operation of boilers on other types of fuel is not provided. In accordance with the Design Assignment, the boilers are equipped with combined burners GKP-400M and GKP-280 M from Oilon. The boilers are equipped with control systems: Entromatic 50.1, which controls the operation of boilers in a cascade together with the burner control system; Entromatic 50.2, which controls the DHW circuit together with the burner control system; Entromatic 50.3, which controls the operation of pumps in the heating circuit before and after heat exchangers. Boiler operation mode: maximum water temperature at the outlet of the boilers - 1100C, control to ensure the water temperature at the inlet - not lower than 600C; operating pressure in the boiler - 0,5 MPa. The boiler room is three-circuit. The first circuit is a boiler room 110 -700С; the second - network heating and ventilation systems - 95 - 700С; the third - hot water systems - 650C. Connection to the boiler circuit: heating and ventilation systems - according to an independent scheme using two plate heat exchangers of the M15-MFM type (8056 kW) from Alfa Laval; hot water supply systems - according to a closed circulation scheme using two plate heat exchangers of the M10-BFM type (1832 kW) manufactured by Alfa Laval air - type GTS 32-1M with Entromatic 125. Maintaining the temperature of the heat carrier of hot water supply systems at a constant level - with a three-way control valve MHF50F with an electric drive before the heat exchanger, a temperature sensor TW50.02 after the heat exchanger and Entromatic 32. The connection of additional consumers of thermal energy to the boiler house due to the future load is taken on direct parameters, taking into account the preparation of heat carriers of heat-consuming systems in the ITP. Feeding of the boiler and network circuits in the boiler room is provided from a drinking water supply system with preliminary chemical water treatment using a TEKNA APG 2 dosing unit. To account for thermal energy, a metering unit with a heat calculator SPT50.02 NPF "Logic" is provided, consisting of two temperature sensors KTPTR-603, 961.2, two TPT 0,1-1 sensors, PREM water meters, ERSV-4F meters and MIDA-DI pressure sensors. The boiler room is automated, without the constant presence of service personnel. The Entromatic boiler control devices and the additional burner control system Wise Drive 520 provide automatic control of the operation of the boiler room equipment depending on the signals from process sensors about the need for thermal energy by heat-consuming systems. The boiler room is equipped with systems that provide: protection and safety of equipment operation; protection of the boiler room from gas pollution by methane and carbon monoxide and from fire with shutdown of gas supply to the boiler room in various emergency situations in the operation of the equipment: fire alarm; actuation of the room protection system from CH100 and CO gas contamination (at the second threshold); interruption of power supply. Gas consumption for installed capacity - 4 m1165,26/h. In accordance with the Technical Specifications, the source of gas supply is a distribution gas pipeline of medium pressure DN 300 mm. Gas supply to the boiler house is provided using the existing dead-end branch from the distribution gas pipeline - a steel gas pipeline of medium pressure DN100 mm with further laying by a polyethylene gas pipeline PE 100 SDR 17,6 (GOST R 50838-95) Dn125 to the exit from the ground near the wall of the designed boiler house, with laying by a steel gas pipeline D133x4,5 mm along the facade before entering the boiler room. The maximum gas consumption is 1165,26 m3/h, the minimum is 209,26 m3/h. The gas pressure at the inlet to the boiler room is 0,12 MPa. The gas pressure in front of the burners is 115 mbar. At the inlet of the gas pipeline, it is planned to install a KTZ-01 thermal shut-off valve, shut-off fittings, a FN 6-1 mesh filter, a VN6N-3 solenoid valve, a ZR6-6 PR control damper and a commercial metering unit based on a STG-150-650 gas meter. The installed boilers are equipped with combined burners GKP-400M and GKP-280M, equipped with ball valves, two solenoid valves with a tightness control system, gas flow throttles, igniters, minimum and maximum pressure switches. Additionally, the burners are equipped with Wise Drive 100 control systems. On the branches of the gas pipelines to the boilers, installation of shut-off fittings, a gas filter, a Divol 600 gas pressure regulator with a built-in shut-off valve, a VS / AM 65 BP safety and relief valve and an L30 compensator is provided. Purging of gas pipelines is provided at the inlet of the gas pipeline, on the branches to the boilers after fittings and before the burners. The power supply of the boiler house is provided in accordance with the technical specifications. The power allowed for connection to the power source of power receivers of category III in terms of power supply reliability is 138,2 kVA. Power source - PS-542. The point of connection to the network is RU-0,38kV of the new transformer substation (instead of transformer substation-768). Design, construction of a transformer substation and 10 kV networks is carried out by the customer. 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-J200K Nexys Silent (200 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 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 paragraphs 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 sets of rules approved by the order of the Government of the Russian Federation of 21.06.2011/121,7/0,38 , and is not mandatory), but is approved by the Energy and Engineering Committee. The design load of the boiler house is 1 kVA. For connection to the 4 kV switchgear of a new transformer substation (BKTP), it is planned to lay a cable of the APvBbShp-240kV brand with a cross section of XNUMXxXNUMX mm² from the ASU 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; Outdoor Lighting. For the distribution of electricity and the protection of electrical networks, a main switchboard (ASU) is provided, assembled on elements of the ABB company, with an automatic backup device for inputs (AVR). To account for the consumed electricity at the inputs of the ASU, electronic meters "Mercury 230" and "TsE2727" (D-G) are provided. Industrial explosion-proof lamps with fluorescent lamps are provided for lighting industrial premises. Existing lighting fixtures are provided to illuminate the territory. For the installation of distribution and group electrical networks, cables of the VVGng 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 fifth wire from the main switchboard, together with the supply wires. The project provides for a potential equalization system by combining on the main ground bus (GZSH) conductive parts: busbars MSB (PE), steel pipes of building communications, metal parts of building structures, lightning protection. The PE VRU-0,4kV bus was adopted as the GZSH. Natural grounding conductors (reinforced concrete foundations of the chimney, boiler room) and an artificial grounding conductor, combined into one device, are accepted as a grounding conductor. In accordance with the current contract for the provision of communication services, it is planned to connect the boiler house to the existing city telephone network. 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. Automatic transmission of emergency and technological signals to the control center via communication channels is provided. 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. Water supply (cold water) and water disposal of the consumers of the facility is provided in accordance with the conditions of connection.