RU2002998C1 - Boiler plant - Google Patents

Abstract

Use, gas purification and heat recovery The essence of the invention, the device comprises a boiler, a tubular multi-pass air heater, an ash collector, a device for purifying flue gases from sulfur oxides and for suppressing nitrogen oxides, a gas-gas heat exchanger, a gas-air recuperative heat exchanger connected through gases inverted and air duct connected to sections the first stroke of the air heater The flue gases pass through the sections of the tubular air heater are cleaned of ash and sulfur oxides and fed in by heating gas-gas heat exchanger path The heater in the gas-steam heat exchanger gases enter the device for suppressing nitrogen oxides from which pass through the heating path of the gas-gas heat exchanger, heating the flue gases after the device for cleaning sulfur oxides, and the heating path of the gas-air heat exchanger, from which the smoke exhauster is emitted into the chimney 2 silt

Description

The invention relates to a power system and is intended for use in boiler plants with integrated treatment of flue gases leaving the boiler,

A boiler plant is known, comprising a boiler, after which an hot ash collector, a nitrogen oxide suppressor, an air heater, a cold ash collector and a desulfurization system with heating exhaust gases before being discharged into the chimney are successively connected upstream of the gas.

Also known is a boiler installation comprising a boiler, an air heater, an ash collector, a device for purifying flue gases from sulfur oxides and for suppressing nitrogen oxides, a gas-gas heat exchanger for heating flue gases after they have been cleaned from sulfur oxides, an air-gas heat exchanger connected through a heating medium to a gas duct between the gas-gas heat exchanger and the chimney, and along the line of the heated medium into the air duct supplying blast air to the air heater.

The disadvantage of this device is the increased likelihood of low temperature corrosion and a decrease in the durability and reliability of the tubular air heater.

The purpose of the invention is to increase the efficiency and reliability of operation.

Figure 1 shows a diagram of a boiler plant using a multi-way tubular air heater to heat blast air without changing the layout of the recuperative heat exchanger; figure 2 is a diagram of a boiler plant using a multi-way tubular air heater and changing the layout (in accordance with this invention} -recorative heat exchanger.

The proposed boiler installation (see FIG. 2) contains a boiler 1, in the gas duct of which, behind the economizer, sections 2 of heat exchange surfaces of a multi-pass tubular air heater (TBP), an electrostatic precipitator 3, and a wet-lime flue gas purification device 4 are installed sequentially along the gases from sulfur oxides, an intermediate exhaust fan 5, a heated path of a gas-gas heat exchanger 6 (GGTO), a high-temperature flue gas heater, for example, a gas-vapor heat exchanger 7,

ammonia-catalytic device 8 for suppressing nitrogen oxides, the heating path of the gas-gas heat exchanger 6 and additional gas-air recuperative

a heat exchanger 9, a smoke exhauster 10 and a chimney 11. A supply of blast air in section 2 of T8P is provided from a blow fan 12 through a heated path of a gas-air heat exchanger 9 and

connecting air duct 13. A feature of the proposed boiler plant is the invert (oncoming) gas connection of the recuperative heat exchanger 9 itself and direct connection

its duct 13 to the input of sections 2 of the first turn of the TVP. This feature of the proposed boiler installation also determines the feature of its operation, which consists in the following.

The flue gases of the boiler pass through sections 2 of the TVP, in which heat is transferred to the heated air, and they are cleaned of ash in an electrostatic precipitator 3 and of sulfur oxides in a wet-lime desulfurization device 4 and a smoke exhauster 5

fed into a heated beat of the GGT. The flue gases heated here are heated to the required temperature by external heat in a gas-steam heat exchanger 7 and enter the Vamma-catalytic nitrogen purification unit, from which they pass through the heating unit GGTO b, heating the flue gases after the desulfurization device 4 and the heating path of the gas-air recuperative heat exchanger 9 inverted via from which the exhaust fan 10 is discharged into the chimney 11. Air is supplied by the blower fan 12 to the heated path of the gas-air recuperative heat exchanger 9, from which without

mixing (but with a backward skew of the flow temperature in height) enters the first stroke of sections 2 of the TVP. At the same time, air enters the cold lower sections of the heat exchange surfaces of the sections 2 of the TVP

with a higher temperature than the average air preheating temperature in the recuperative heat exchanger 9. This eliminates their low-temperature corrosion, increases the reliability and durability of the TVP in operation even with a slight decrease in the average air preheating temperature and flue gas temperature, and increases the efficiency of the boiler plant.

(56) Patent EPO 0189917.C. F 23 J 15/00. 1986, Fig. Z.

Claims (1)

The claims A BOILER PLANT, comprising a boiler, an air heater, an ash collector, a device for cleaning flue gases from sulfur oxides and for suppressing nitrogen oxides, a gas-gas heat exchanger for heating flue gases after they have been removed from sulfur oxides, a gas-air heat exchanger connected through a heating coolant to gas duct between gas and gas heat exchanger and smoke by a pipe, and along the line of the heated medium into the air duct for supplying blast air to the air heater, characterized in that, in order to increase its efficiency and reliability in operation, the air heater is made tubular multi-pass, the gas-air heat exchanger is made recuperative, it is switched on invertively by gas and connected to the section the first stroke of the air heater. J u Figure 1 eleven 10 //////// ////// At FIG. 2