A flue gas dedusting device with backwashing function

Abstract

The invention discloses a fume dedusting device with a backwashing function. The device comprises a tank body, wherein end covers are welded to the front end and the rear end of the tank body separately; one end, far away from the tank body, of each end cover, serves as a fume inlet or a fume outlet; cover plates are mounted at the front end and the rear end of the tank body separately; a filtering tube is mounted in the tank body; filtering particles are stored in the filtering tube; a plurality of separating plates are mounted in the tank body, and alternatively staggered to form a maze type flowing channel; a water feeding pipe and a water draining pipe are arranged on a sidewall of the tank body; a storing chamber communicated with a steam outlet pipe is formed in the sidewall of the upper end of the tank body; a dust outlet and a first valve are arranged on a sidewall of each end cover; a second valve is mounted at the fume inlet. The device can perform fume dedusting, heat exchange, and backwashing operations. According to the abovementioned technical scheme, the device has the advantages that a convenient cleaning function is realized by backwashing; in addition, the high-temperature fume dedusting operation and the waste heat recovering and heat exchanging operations are performed in an integrating manner; the device is stable and reliable in structure, and high in efficiency; the production and manufacturing cost is greatly decreased; and moreover, the workload of operators is decreased.

Description

technical field [0001] The invention relates to the technical field of high-temperature flue gas purification and waste heat recovery equipment, in particular to a flue gas dedusting device with backwashing function. Background technique [0002] The waste heat recovery and purification of high-temperature flue gas in high-energy-consuming and high-emission industries such as metallurgy, chemical industry, and building materials play an important role in my country's energy conservation and emission reduction. Industrial high-temperature flue gas has the characteristics of complex composition, high dust content, corrosiveness, and large changes in working conditions, which make the flue gas waste heat recovery and purification devices have bottleneck problems such as filter blockage and regeneration difficulties, waste heat recovery and purification efficiency, etc. waiting to be solved. [0003] Common methods for high-temperature flue gas purification and waste heat recov...

AI Technical Summary

Problems solved by technology

Industrial high-temperature flue gas has the characteristics of complex composition, high dust content, corrosiveness, and large changes in working conditions, which make the flue gas waste heat recovery and purification devices have bottleneck problems such as filter blockage and regeneration difficulties, waste heat recovery and purification efficiency, etc. waiting to be solved

[0003] Common methods for high-temperature flue gas purification and waste heat recovery are as follows: 1) First, reduce the temperature of the flue gas by spraying, and remove most of the dust at the same time, and then use a cloth bag or ceramic tube filter to remove dust. This method waste heat recovery The rate is extremely low, and there is secondary pollution

2) The high-temperature dust-laden flue gas is directly introduced into the waste heat boiler for waste heat recovery, and then the dust-laden flue gas with a lower temperature is discharged through a cloth bag or a ceramic tube filter for precise dust removal, but the high-concentration dust contained in the flue gas is in the A thick layer of slag will form on the wall of the boiler, which will increase the heat transfer resistance and reduce the efficiency of waste heat recovery. Periodic manual slag removal is required, and the high-temperature flue gas cannot directly enter the waste heat boiler due to its high temperature. It needs to pass through the water-cooled wall first. cooling, reducing waste heat recovery efficiency

3) High-temperature dust removal devices such as granular bed and ceramic tube filter are used to purify high-temperature flue gas first, and then recover waste heat through heat exchanger. This method has high waste heat recovery efficiency, but due to the dust removal process and heat exchange process Separately, it is impossible to control the temperature of the dust removal process to improve the dust removal performance, which leads to a larger volume and higher cost of the dust removal equipment; and when the high-temperature flue gas contains condensed dust particles, the ceramic tube filter is easily blocked and cannot be cleaned. Therefore, it cannot be recycled, and the filter material particles are composed of discrete spheres, which are easy to clean and recycle, and have irreplaceable advantages in high-temperature flue gas dedusting containing condensed dust particles.

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