Boiler flue gas treatment system with efficient air preheater

Abstract

The invention discloses a boiler flue gas treatment system with an efficient air preheater, and belongs to the technical field of boiler flue gas treatment and preparation. The problems that in the prior art, a treatment system is prone to generating ammonium bisulfate blockage, dust accumulation and air leakage are solved. The boiler flue gas treatment system comprises an SCR denitration reactor, the air preheater, a flue gas air heater, an electrostatic dust collector and a desulfurizing absorption tower, all of which are sequentially connected, air outlets of the air preheater are connected in parallel to form two branch ends, one end flows back to a boiler, the other end communicates with an inlet of the flue gas air heater, and an outlet of the flue gas air heater further flows back to air inlets of the air preheater. The flue gas air heater is additionally arranged in the flue gas treatment system, the inlet air temperature of the air preheater is increased, ammonium bisulfate blockage is avoided, a sound wave ash remover is arranged in the air preheater, ammonium bisulfate blockage in a shell is effectively removed, the rotating speed of the shell is changed in real time, and dust and dirt cannot be accumulated in the shell; and by means of a flexible sealing assembly, the problem of air leakage caused by deformation of the shell is avoided.

Description

technical field [0001] The invention belongs to the technical field of boiler flue gas treatment, and in particular relates to a boiler flue gas treatment system with a high-efficiency air preheater. Background technique [0002] The boiler flue gas treatment system of a thermal power plant usually needs to use a rotary air preheater to cool down the raw flue gas. Due to the mandatory requirements of the national environmental protection policy, the existing thermal power units need to be equipped with a flue gas denitrification device, and an appropriate amount of ammonia needs to be injected. The resulting ammonium bisulfate will form scales that are difficult to remove in the air preheater. At the same time, there is an air leakage in the rotary air preheater that causes cold air to leak into the flue gas, causing low-temperature corrosion, scaling and blockage. Contents of the invention [0003] The purpose of the present invention is to provide a boiler flue gas treat...

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Problems solved by technology

[0002] The boiler flue gas treatment system of a thermal power plant usually needs to use a rotary air preheater to cool down the raw flue gas. Due to the mandatory requirements of the national environmental protection policy, the existing thermal power units need to be equipped with a flue gas denitrification device, and an appropriate amount of ammonia needs to be injected. The resulting ammonium bisulfate will form scales that are difficult to remove in the air preheater, and at the same time, there is an air leakage in the rotary air preheater that causes cold air to leak into the flue gas, causing low-temperature corrosion, scaling and blockage

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