Flue gas denitrification device used for coal-fired boiler

Abstract

The invention relates to the field of environmental protection equipment, in particular to a flue gas denitrification device used for a coal-fired boiler. The flue gas denitrification device comprisesa spray tower, an oxidation system, a spraying system and a circulating system, wherein the spray tower comprises a tower body and an internal core, a flue gas inlet pipe is connected to the bottom of the tower body, and the top of the tower body is connected with a flue gas outlet pipe; the oxidation system comprises an ozone generator and an ozone ejector which is arranged in the flue gas inletpipe and connected with the ozone generator; the spraying system comprises a liquid tank, an absorption liquid, a spraying pipe and a plurality of nozzles, the liquid tank is distributed on the bottom of the tower body, the spraying pipe is communicated with the liquid tank through a circulating pump, and the nozzles are arranged on the spraying pipe; the circulating system comprises a separator,the inlet end of the separator is connected with the liquid tank through a first liquid conveying pump, the salt liquid outlet end is connected with a waste liquid treatment device through a second liquid conveying pump, the absorption liquid outlet end is connected with a liquid storage tank used for storing the absorption liquid through a third liquid conveying pump, and the liquid storage tankis further connected with the liquid tank through a fourth liquid conveying pump. The flue gas denitrification device is high in denitrification efficiency, low in cost and facilitating environment friendliness.

Description

technical field [0001] The invention relates to the field of environmental protection equipment, in particular to a flue gas denitrification device for coal-fired boilers. Background technique [0002] The flue gas produced by coal-fired power plants contains a large amount of nitrogen oxides, of which more than 95% are NO. Oxynitride is not only the main component of smog, which is a major hazard to the human body and other organisms, but also one of the main causes of acid rain. Therefore, the national environmental protection regulations have increasingly stringent requirements on the emission of nitrogen oxides, and the emission standards of nitrogen oxides in new projects have become more stringent. Nitrogen oxide removal technology has become one of the focuses. [0003] Existing flue gas denitrification technologies can be divided into dry denitrification and wet denitrification. Selective catalytic reduction (SCR) is the most widely used dry denitrification method...

AI Technical Summary

Problems solved by technology

NaClO 2 and NaClO have high requirements for corrosion resistance of equipment, and the price of oxidant is relatively expensive

h 2 o 2 Unstable properties, easy to decompose when heated and consume a lot

In addition, the spray tower generally has the problem that the inlet pressure of the nozzles of each layer varies greatly

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