Ammonia desulphurization ultra-low discharging system and ammonia desulphurization ultra-low discharging process

Abstract

The invention discloses an ammonia desulphurization ultra-low discharging system and an ammonia desulphurization ultra-low discharging process, belonging to the field of environmental protection. The ammonia desulphurization ultra-low discharging system comprises a desulfurizing tower, an ammonia adding system, a circular crystallizing system, a purifying and washing system and a rear ammonium sulfate system, wherein the lower part of an oxidizing section of the desulfurizing tower is connected with the rear ammonium sulfate system through the circular crystallizing system; the upper part of the oxidizing section of the desulfurizing tower is connected with the ammonia adding system through a pipeline; the circular crystallizing system is connected with a concentrated circulating section of the desulfurizing tower through a pipeline; a purifying and washing section of the desulfurizing tower is connected with the purifying and washing system through a pipeline. The ultra-low discharging process provided by the invention belongs to a gas-liquid reaction and has the advantages of high reaction speed, complete reaction and high desulfurizing efficiency. The system disclosed by the invention meets the requirement on ultra-low discharge, is simple in structure, easy in realization and low in cost, and facilitates wide popularization and application.

Description

technical field [0001] The invention relates to an ammonia desulfurization ultra-low emission system and process, belonging to the technical field of environmental protection. Background technique [0002] my country is a big coal producing and burning country in the world. The acid rain caused by sulfur dioxide emitted by coal burning has affected 40% of the country's area of ​​nearly 4 million square kilometers, and it is still expanding. [0003] There are many ways to control sulfur dioxide in flue gas: fuel desulfurization before combustion, desulfurization during combustion of desulfurizers, and flue gas desulfurization after combustion. Judging from the current usage in various countries in the world: for coal-fired boilers, the most economical and effective method is flue gas desulfurization. [0004] At present, flue gas desulfurization technology can be divided into many types according to different classification methods; among them, the most commonly used one is...

AI Technical Summary

Problems solved by technology

[0008] As the national environmental protection situation is becoming increasingly severe, the design emission indicators of the desulfurization system for ordinary empty tower spraying can no longer meet the national requirements.

Even if there is a segmented design in the desulfurization tower, it does not solve the two major disadvantages of ammonia desulfurization: flue gas tailing and no product after post-treatment

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