The automated gas boiler house is intended for heat supply and hot water supply of administrative and residential buildings. According to the reliability of heat supply, the boiler room belongs to the second category. By location, the boiler room belongs to the category of stand-alone. The degree of fire resistance of the structures of the boiler house building is II.

Architectural and building solutions.

 The building of the boiler house is made in a block-modular design from easily assembled metal structures with a cladding made of galvanized profiled painted sheet. The fire safety of metal structures is ensured by their own fire resistance limit. The minimum fire resistance limit of the building's load-bearing structures (metal crossbars) is R45. The degree of fire resistance of the boiler house building is II. The category of the premises in terms of explosion and fire hazard is G. The building of the boiler house is rectangular in plan, has overall dimensions of 12,0x4,0x3,1m (length x width x height), the roof is shed. Functional fire hazard class of the boiler room F 5.1. (SNiP 21-01-97*). A boiler room without attendants, therefore, according to SNiP 21-01-97 *, it is allowed to have one exit directly to the outside. The boiler room in the plan has dimensions of 11,8x10,2 m. The height to the bottom of the protruding structures is 3,1 m. The required area of ​​​​easily dumped enclosing structures in accordance with SNiP II-35-76 with rev. 1 is 0,03 m2 per 1 m3 of the volume of the room in which the boilers are located: F = 0,03 x (127,8-9,55) = 3,54. Taking into account the open area of ​​louvres, the required glazing area Fres.= 3,54-0,7=2,84 m2. The calculation showed that the explosive protection of the boiler room is provided by two window openings with a total area Fok. \u2d 1,6x (0,9x2,88) \u2d 0,35 m2 (excluding the area of ​​\u0.00b\u42,84bwindow frames) and two louvered grilles with a living section of 500 m18 (each). The building of the boiler house and the foundations for the equipment rest on a monolithic reinforced concrete slab. To ensure optimal conditions for the operation of the burners, the floors in the boiler room are made of moisture-resistant laminated plywood, the top flooring is corrugated aluminum sheet. The relative mark of ±60,84 of the clean floor of the boiler room corresponds to the absolute mark of + XNUMX m according to BSC. Flue gases from each boiler are removed from the boiler room through their metal insulated chimney with an internal diameter of XNUMX mm. The height of the top of the chimneys relative to the level of the clean floor of the boiler room is +XNUMX m, which corresponds to the absolute mark of +XNUMX m. In the lower part of the chimneys, manholes are provided for their inspection, as well as devices for removing condensate. Gas ducts behind the boilers - without descents and places of accumulation of gases, in addition, they have a small length. In this regard, the installation of explosive valves on them is not provided.

Thermal mechanical solutions.

Basic equipment. As the main equipment for the installation, two Logano SK745 hot water boilers with a capacity of 820 kW each, Buderus (Germany) were accepted. One boiler is equipped with a combined burner for natural gas and diesel fuel VGL05.1000 Duo Plus with a capacity of 240-1000 kW, manufactured by “ELCO”. The second boiler is equipped with a gas burner VG05.1000 Duo Plus with a power of 270-1040 kW, manufactured by “ELCO”. The Logano SK745 hot water boiler is designed to produce hot water for heating needs, pressure up to 0,6 MPa and temperature up to 115ºС. It is intended for work on diesel fuel, natural and liquefied gas. Combustion chamber with a two-way principle of the passage of hot gases.

 Thermal scheme. The thermal scheme of the boiler house is shown in the drawing OK 24.10 / ST-TM (sheet 2). The boiler room provides for the installation of two water-heating boilers of the Logano SK745 brand with a thermal power of 820 kW each, Buderus (Germany). The heat supply system is closed, two-circuit, four-pipe, independent. The temperature curve of the boiler circuit is 105°/80°C. Water circulation in the boiler circuit is provided by double boiler pumps, operating mode - 1 main, 1 standby. To ensure a reduction in the flow rate of the heat carrier circulating in the boiler circuit, when one of the boilers is turned off, frequency regulation is provided. The heat carrier for the heating system is network water with design temperature parameters of 95 - 70 ºС, control of the heat carrier temperature depending on the outdoor temperature according to the heating schedule . The heating water temperature is controlled by redistributing the heat carrier from the direct pipeline to the return pipeline using a three-way valve installed on the boiler circuit. The circulation of the heat carrier of the heating circuit is provided by dual network pumps, the operating mode is 1 main, 1 backup. The heat carrier for the DHW system is network water with design temperature parameters of 60 ºС, control of the heat carrier temperature at a constant temperature. Ensuring a constant DHW temperature is carried out by redistributing the coolant from the direct pipeline to the return pipeline using a three-way valve installed on the boiler circuit. Achieving the required pressure at the consumer, as well as the circulation of hot water in the network, is provided by DHW booster-circulation pumps, the operating mode is 1 working, 1 standby. Pumps are provided with frequency regulation. In order to compensate for the thermal expansion of water in the boilers and pipelines of the boiler circuit, expansion tanks of the membrane type are provided. Prevention of a possible increase in pressure in the boiler and network circuit is achieved by installing safety valves. The discharge from the safety valves is carried out into the boiler house's wastewater system. To maintain the required volume of water in the boiler and network circuits of the boiler room, make-up is provided. Filling and make-up of the boiler and network circuits are provided in the boiler room. The primary filling of the boiler room pipelines is provided from the cold water pipeline through the emergency make-up pipeline. Feeding of the boiler and network circuits is provided by make-up pumps, operating mode - 1 main, 1 standby. The required quality of make-up water is achieved using a chemical water treatment system (see. section B). The required water quality for the hot water supply system is achieved by adding to the source water, the water that has been prepared in the chemical water treatment system. To control the quality of water in the boiler room, the installation of samplers is provided.  equipping the boiler room with a control, regulation and safety system; availability of a backup network pump. The regulation of the operation of boilers and the maintenance of the necessary parameters of the coolant is provided with the help of boiler automation. At the lowest points of the pipelines of the boiler house, installation of devices for draining water is provided, and at the top - installation of air vents. All drains and drains of the boiler room are discharged by the drainage free-flow pipeline T96 in the external sewerage network. The project does not provide for the use of exhaust gas heat. The flue gas temperature is 210°C, for the heat recovery of the flue gases, special expensive equipment with a long payback period is required, which is not economically feasible. In addition, when the flue gas temperature decreases, condensation may form on the surface of the chimneys, which leads to corrosion of the chimney surface.