Anti-blocking heat exchanging device for pulverized coal boiler air pre-heater

Abstract

The invention discloses an anti-blocking heat exchanging device for a pulverized coal boiler air pre-heater. The anti-blocking heat exchanging device for the pulverized coal boiler air pre-heater comprises a main body. Pipes are arranged at two ends of the main body. The pipes are connected with a dust collector and an induced draft fan. The interior of the main body is divided into a plurality ofheat exchanger unit modules. Each heat exchanger unit module comprises an outer frame which is a cube or cuboid structure. Two ends of each outer frame are flues. A hollow cylinder is arranged insideeach outer frame. The forming direction of flues at two ends of each outer frame are identical with the installing direction of the pipes. The installing direction of each hollow cylinder is perpendicular to the installing direction of the pipes. Two ends of each hollow cylinder are connected respectively with an air feeder and an air pre-heater. By means of the anti-blocking heat exchanging device for the pulverized coal boiler air pre-heater, the flue gas temperature at the outlet of the air pre-heater is improved; the blocking phenomenon of the air pre-heater caused by hydrogen ammonium sulfate can be effectively mitigated; heat exchange is conducted at the inlet of the induced draught fan; the flue gas temperature entering the boiler smoke window is lowered; and the boiler efficiencyis improved.

Description

Technical field [0001] The invention belongs to the technical field of boiler heat exchange, and relates to an anti-blocking heat exchange device for an air preheater of a pulverized coal boiler. Background technique [0002] With the enhancement of national environmental protection regulations, power plant boiler flue gas denitrification devices (SCR / SNCR) are widely used in various power plants. As a result, ammonia escape, ammonium bisulfate deposition, ash blocking and corrosion problems are more common. Because ammonium bisulfate exhibits strong adhesion at 147-200°C, the air preheater has serious ash blocking and corrosion problems. This causes problems such as increased resistance of the air preheater, increased power consumption of the induced draft fan, decreased heat exchange performance of the air preheater, increased air leakage rate of the air preheater, corrosion of heat storage elements, etc., which may even affect the load of the boiler in severe cases. Capabilit...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an anti-blocking heat exchange device for the air preheater of a pulverized coal boiler, which solves the problems of the air preheater in the prior art due to clogging and corrosion.

Images