Architectural and space-planning solutions

The project documentation projected the construction of a boiler house, which is part of the construction and reconstruction of the district heating system. The gas boiler house and chimney are designed on the construction site of the dismantled boiler house and chimney. Gas boiler house - a one-story building of different heights without a basement and an attic, partially adjacent to buildings for other purposes, consisting of two parts, forming an "L"-shaped outline in plan, with dimensions in the extreme axes "B-G" and "1-4" - (7,95x17,99) m; "A-B" and "3-4" - (5,52x5,65) m. The internal space of the boiler room consists of a boiler room, a diesel generator room and a utility room. For a relative mark of 0,000, the mark of the clean floor of the boiler room was taken. The height of the room of the lower part of the boiler room to the bottom of the protruding roof structures is designed as a variable from 2,40 m to 3,00 m. The height of the room of the elevated part of the boiler room to the bottom of the protruding roof structures is variable from 5,63 m to 5,90 m. building from the planning level of the ground (variable from minus 0,15 to minus 0,34 m) to the top of the parapet is 7,04 m. The production process is designed without the constant presence of people. The building is with an incomplete metal frame. The walls are brick, with mineral wool insulation, lined with fiber cement boards according to the “ventilated facade” system. The wall that rises from the roof surface of the lowered part of the building is made of hinged sandwich panels. Doors - metal, insulated, fireproof. Roof (covering) - low-slope, combined, insulated on steel profiled flooring along girders and beams with a roof made of rolled materials. A window is an easy-to-reset structure. The drain is external. Floors - ceramic tiles, corrugated perforated metal sheet, cement-concrete with a polymer coating and with a slope towards the drain. To remove combustion products, a chimney with gas outlet shafts is designed, which is installed on its own foundation. Combustion products are discharged into the chimneys from the boiler building through the side wall. The height of the chimneys from the planning mark of the earth (minus 0,15 m) is 26,75 m. The flue pipes are made of stainless steel.

Structural and space-planning solutions

Structural solutions of the boiler house building are developed taking into account the location of the building in the existing building. The building is adjacent to the house. The risk zone of new construction includes existing residential and public buildings, the survey of which has been completed. Buildings of different years of construction - brick with foundations on a natural basis; assigned to the 2nd category of the technical condition of structures according to TSN 50-302-2004. There is no negative impact on the surrounding development, which is confirmed by calculations when assessing the geotechnical situation at the construction site. The building of the boiler house is designed with brick exterior walls and a steel structure interior frame. Columns, beams covering from rolled steel profiles. Covering - steel profiled flooring. The foundations for the brick walls of the building are the existing foundations of the dismantled boiler house: strip rubble, made of limestone slabs on lime-sand mortar. The depth of foundations is 1,8 m; in cross section, the foundations have a rectangular profile, the width of the sole is 0,72-1,14 m. At the base of the foundations there are bulk soils. The foundations are in limited working condition. Verification calculations and, taking into account their technical condition, established the possibility of further operation of existing foundations without reinforcement. Monolithic reinforced concrete strips with cantilever adjoining to the foundations of an existing residential building were designed under the frame columns and racks of the technological platform. The existing foundations of the boiler house and the new foundation strips are connected by a monolithic reinforced concrete slab 250 mm thick on a compacted sand pad. Measures are provided to ensure the stability of the adjacent building, the safety of existing underground utilities: the absence of a basement in the designed building; the mark of the bottom of the foundations is not lower than the depth of the existing foundations; ensuring the maximum allowable additional settlement of the foundations of the existing building is not more than 1,0 cm; cantilever adjoining of new foundations to existing houses. An exhaust tower in the form of a triangular prism 23,2 m high with a facet dimension of 1,2 m was designed for fastening the gas exhaust shafts. Racks and braces are steel electric-welded pipes, belts and beams of the platforms are steel channels. The exhaust tower is installed on the existing foundation. The survey established the working condition of the foundation. The basement brick part of the foundation is reinforced with a steel clip; along the edge of the brick part, a reinforced concrete head is designed with anchor bolts for attaching the exhaust tower. The calculation of foundations and the main load-bearing structures of the building was carried out using the SCAD software package version 11.5. Design solutions provide for geotechnical control over the surrounding buildings during construction and installation works. A relative elevation of 0,000 corresponds to an absolute elevation of 6.05 m.

Engineering equipment, utility networks, engineering activities

For the heat supply of buildings, an automated, gas-fired, attached heating gas boiler house was designed. According to the degree of explosion and fire hazard, the boiler room belongs to category "G". The installed capacity of the boiler house is 4,5 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. The boiler house is equipped with three water-heating boilers of the Termotekhnik TT100 brand with a heat output: three boilers of 1500 kW each with GKP-140M combined burners. The estimated heat output of the boiler house, taking into account losses in the networks and auxiliary needs of the boiler house, will be 4,022 MW, including: for heating - 3,64 MW; for losses in heat networks - 0,315 MW; auxiliary needs of the boiler house - 0,067 MW. The main type of fuel is natural gas QpН = 33520 kJ/m3 (8000 kcal/m3). The scheme for connecting heat networks intended for transporting the coolant to heating systems is independent through heat exchangers. 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 thermal expansion of water in the boiler circuit, two expansion tanks are provided: two V=600 l and one V=200 l for make-up. Auxiliary equipment is installed in the boiler room: individual pumps of the boiler circuit IL80/210; network circuit pumps IL125/340; booster pumps - MVI 104; plate heat exchangers M15 BFG - 2 pcs., 2730 kW each; 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 the products of combustion, metal individual gas ducts and chimneys are designed with a height of 26,5 m from the floor of the boiler room, with a diameter of 350 mm. 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 108 mm, laid to a closing boiler house. For gas supply to the boiler house, it is planned to lay an above-ground steel gas pipeline of medium pressure with a diameter of 89 mm to the ShRP-NORD-DIVAL / 600/50-2 boiler house installed on the facade of the building, lay an above-ground low-pressure steel gas pipeline with a diameter of 219 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 longitudinal 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-650-R-2 type is installed. The maximum gas consumption is 556,2 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 FN8-1; solenoid valve series EVPS13 308. To improve the reliability of the power supply to the boiler plant, it is planned to install a SDMO J88 Nexys Silent diesel generator 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. st., Р2=31,0 m of water. st, T1=95°C, T2=70°C. The heat load of the heating systems of the connected buildings is 3,13 Gcal/h. The connection point is the collector of the boiler room. Laying of pipelines of the heating network - underground, two-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 100 mm or less, for underground laying, Isoproflex A pipelines in PPU insulation were selected. Compensation of thermal elongations is provided due to the angles of rotation of pipelines of the heating network. The transfer of pipelines of the heating network along the existing routes, with the exception of the laying along the new one, was designed. Water supply (cold water) and water disposal of the consumers of the facility is provided in accordance with: connection conditions; connection conditions. Water supply (cold water) is provided from the public water supply network D=160 mm through two inputs from pipes D=110 mm and stainless steel electric-welded water pipes D=100 mm (transit through the basement). The inputs provide for the installation of water metering units according to TsIRV 02A.00.00.00 (sheets 192,193). Guaranteed pressure at the connection point - 28 m of water. Art. Estimated consumption of cold water - 10,91 m3 / day (feeding heating networks, filter regeneration, cleaning). The estimated consumption of cold water for periodic needs is 64,15 m3 / day (filling the heating network system and the boiler circuit once a year). Water consumption for internal fire extinguishing - 5,0 l / s (2 jets of 2,5 l / s). The number of fire hydrants D = 50 mm - less than 12 pcs. A combined dead-end, single-zone water supply system was designed for the building. The required pressure for the combined water supply system is 24,59 m of water. Art. For the device of the integrated water supply system, steel water and gas pipes were selected. External fire extinguishing is provided from fire hydrants D = 125 mm, installed on public water supply networks. Water consumption for external fire extinguishing - 10 l / s. Drainage of domestic wastewater in the amount of 0,35 m3 / day, periodic discharge - 6,1 m3 / day 1 time per year (system emptying), rainwater with a flow rate of 5,0 l / s is provided for in the nearest manhole on the yard network communal all-alloy municipal sewer D=250 mm. Polypropylene sewer pipes D = 160 mm were selected for laying the combined sewerage network. Industrial sewage systems (to drain waste from boiler equipment) and external drains were designed for the building. Cast-iron sewer pipes were chosen for the installation of the industrial sewerage system. In accordance with the technical conditions for power supply, the permitted connected power is 52,88 kW. Supply voltage - 380 V, power supply category - 2. Power sources: main power source - PS-542, connection point - RU-0,4 kV RTP-640, backup power source - diesel power plant with a capacity of 80 kVA (64 kW) with automatic start . The power cable is laid from RU-0,4 kV RTP-640 in the ground at a depth of 0,7 m. The cable protection at the intersection with utilities is made with asbestos-cement pipes. Throughout the route, the mechanical protection of the cable is carried out with clay bricks. For the input and distribution of electric power, a main switchboard for two inputs with automatic switching on of backup power is installed in the boiler room. A UPS is provided for the uninterruptible power supply system of category 1 receivers. Electricity metering is provided by a transformer-connected electricity meter at the input to the main switchboard. The grounding of the boiler house and DGU is carried out with the resistance of the grounding device not exceeding 4 ohms. The ground loop is made with a horizontal grounding conductor (steel strip 40x5) and vertical grounding conductors - SHIP electrodes 12 m long. The boiler room is provided with a system for equalizing and equalizing potentials. The main ground bus is installed in the main switchboard. A grounding system is provided for a tanker truck with diesel fuel for refueling DGS. The boiler room and the facilities included in it are protected from direct lightning strikes and its secondary manifestations. Lightning protection is provided by lightning rods installed on the chimneys of the boiler room. In the boiler room, cables of the VVG-ng-LS and VVG-ng-FRLS brands are used. Cables are laid openly on cable structures. The boiler rooms are equipped with working, maintenance and emergency lighting. Emergency lighting is provided by luminaires with built-in rechargeable batteries. Repair lighting is made on voltage 12 V. Outdoor lighting is made by lamps installed on the facade of the building at el. 5,0 m In order to organize a communication channel for transmitting automation signals, in accordance with the contract and specifications, it is planned to lay a cable of the PRPPM 2x0,8 brand along the existing and projected cable ducts. Connection point: junction box No. 25 (RSh-764-28, house pair 253), located at the address: Kuznechny lane, 8, 2nd floor. For security and fire alarm systems, the installation of Orion integrated security system equipment is provided. 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 control unit, the S2000-ASPT control panel and control of automatic fire extinguishing equipment PPKU ASPT S2000-ASPT ”, PPKOP “S4-2000”, signal-starting block “S1-SP01 version XNUMX”. To transmit signals to the monitoring station panel, the installation of the ARKAN device is provided. To automate the operation of the boiler plant, it is planned to install control panels based on Kontar programmable logic controllers manufactured by MZTA and sensors manufactured by Thermokon. 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 is provided as a backup type of communication. 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 fire and security alarm signals, boiler room operation parameters.