Wet flue gas ammonia desulfurization-based synchronous denitration system

Abstract

The invention discloses a wet flue gas ammonia desulfurization-based synchronous denitration system, and aims at solving the problems that an existing system is high in operation cost, high in equipment investment cost, complicated in process and high in energy consumption. According to the technical scheme, the synchronous denitration system comprises a concentration tower and an absorption tower, which are connected with each other through a flue gas pipeline; a circulating hole is formed in the bottom of the absorption tower, and is communicated with the upper part of the absorption tower through an absorption liquid circulating spray line; a drainage hole in the bottom of the absorption tower is connected with the concentration tower via a pipe; a liquid outlet in the bottom of the concentration tower is connected with a first settling pond through a first de-ironing reaction tank; a clear liquid outlet in the upper section of the first settling pond is connected with an ammonium sulfate crystallization system. The wet flue gas ammonia desulfurization-based synchronous denitration system has the advantages of low operation cost, low equipment investment and low energy consumption, and can be used for carrying out desulfurization and denitration efficiently and synchronously.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to a synchronous denitrification system based on flue gas wet ammonia desulfurization. Background technique [0002] my country's iron and steel industry has developed rapidly since the 1990s, resulting in a large amount of air pollutants, among which SO 2 And NOx emissions are second only to power plant flue gas. my country's key statistical steel industry SO in 2011 2 The emission is 2.51 million tons, of which SO 2 The emissions reached 2.18 million tons, accounting for more than 87% of the total emissions of iron and steel enterprises, while SO 2 The treatment rate is only 32%. The characteristics of sintering flue gas are large flue gas volume, large amount of dust carried by flue gas, large changes in emission and concentration of sulfur dioxide, large fluctuations in flue gas temperature, complex flue gas components, and high moisture content in flue gas. Compared wi...

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Problems solved by technology

[0008] However, on the one hand, although Fe(II)EDTA has high denitrification efficiency, it is expensive, and the formation of 2Fe 2+ It is very uneconomical not to recover the complexing agent after EDTA (NO), and the high cost will make it impossible to be industrially practical;

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