SU1370373A1 - Boiler air heater - Google Patents

Abstract

Invention m. used in steam boilers burning solid non-sour fuels. The purpose of the invention is to increase operational efficiency. For this purpose, the water nozzles 8 are installed in the overflow duct 4 behind the heat exchanger 5 along the air path. The drainage pipe 7 is connected to these nozzles 8. The heated water through the pipe 7 goes to the nozzles 8, in which it is poured out into a stream of hot air. Such a boiler design allows reducing the flue gas temperature, increasing the degree of heat utilization of heating gases, and reducing the emission of ash and nitrogen oxides. 1 il. (L

Description

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The invention relates to a power system and can be used in steam boilers that burn mainly solid non-sour fuels.

The purpose of the invention is to increase operational efficiency by lowering the temperature of flue gases.

The drawing schematically shows a boiler equipped with an air heater according to the invention.

The steam boiler contains a furnace 1 and a flue 2 with successively installed heat exchange sections 3 air heaters, air flow boxes 4 communicated through the air, one of which is equipped with an air duct heat exchanger 5 - a water heater with a water inlet pipe 6 and a water heater - transfer pc m pipe 7, the latter being connected to the nozzles 8 installed in the overflow box 4 behind the heat exchanger 5. The air heater is equipped with a supply air duct 9 and a discharge air duct 10 that connects it to by t. It is possible to place heat exchangers 5 with nozzles 8 in all connecting ducts or to place heat exchanger 5 in one of

Claims (1)

boxes 4, and nozzles 8 - in other formulas of the invention boxes 4. Air heater of the boiler, containing heat exchange sections sequentially installed in the duct, communicated through the air overflow ducts, one of which has an air duct heat exchanger fitted with a water supply and discharge pipelines, which is designed so as to increase operating efficiency by reducing temperature g exhaust gases it additionally contains water 8, in which it is finely sprayed into a stream of hot air. Due to the heated water, its contact with the pipes of the air preheater is safe under low temperature corrosion conditions. The injected water is partially evaporated in the duct 4, and then in the tube bundle of the air preheater sections 3. Due to this, the air is cooled, and the temperature pressure in the air heater increases, which intensifies its operation and, accordingly, contributes to the deep cooling of the flue gases. This contributes to an increase in the degree of purification of flue gases, for example, in electrostatic precipitators, i.e. reduce ash emissions. The incoming air Q through the supply air duct 9 and the air humidified in the air heater 5 through air duct 10 is directed to the furnace 1, where water is reduced in the presence of water vapor 25 formation of nitrogen oxides. Humidification of flue gases further improves the collection of ash in electrostatic precipitators. In this way, the degree of heat utilization of the heating gases is increased while reducing emissions of ash and nitrogen oxides. thirty Steam boiler, equipped with the proposed air heater works as follows. The fuel is burned in the furnace 1, forming flue gases pass through the duct 2 and section 3 of a multi-port tubular air preheater in which the combustion air is heated. A relatively small amount of water is supplied to the air-water heat exchanger 5 placed in the overflow box 4 through the pipe 6, which is heated in the heat exchanger 5 to a temperature above the dew point of the flue gases. The heated water exits through outflow pipe 7 to form35. 40 50 nozzles installed in the said downflow box downstream of the heat exchanger along the air path, and the drainage pipe is connected to these nozzles. VNIISH Order 393/35 Random polygons pr-tie, Uzhgorod, st. Project, 4 8, in which it is finely sprayed into a stream of hot air. Due to the heated water, its contact with the pipes of the air preheater is safe under low temperature corrosion conditions. The injected water is partially evaporated in the duct 4, and then in the tube bundle of the air preheater sections 3. Due to this, the air is cooled, and the temperature pressure in the air heater increases, which intensifies its operation and, accordingly, contributes to the deep cooling of the flue gases. This contributes to an increase in the degree of purification of flue gases, for example, in electrostatic precipitators, i.e. reduce ash emissions. The air entering through the supply air duct 9 and humidified in the air heater 5 is directed through the air duct 10 to the furnace 1, where the presence of water vapor in the air decreases the formation of nitrogen oxides. Humidification of flue gases further improves the collection of ash in electrostatic precipitators. In this way, the degree of heat utilization of the heating gases is increased while reducing emissions of ash and nitrogen oxides. 50 nozzles installed in the said downflow box downstream of the heat exchanger along the air path, and the drainage pipe is connected to these nozzles. Circulation 510 Subscription