Single-tower five-section gradient purification, sulfur removal and dust removal ultra-low emission integrated device

Abstract

The invention discloses a single-tower five-section gradient purification, sulfur removal and dust removal ultra-low emission integrated device and belongs to the field of environmental protection. The device is composed of an oxidation section, a concentration section, an absorption section, a purification washing section and a defogging section. The upper portion of the oxidation section of the device and the concentration section achieve gas communication through a pipeline, and liquid isolation is achieved through a partition plate. The upper portion of the concentration section of the device and the absorption section achieve gas communication and liquid isolation through a liquid collecting tank. The upper portion of the absorption section of the device and the purification section achieve gas communication and liquid isolation through a liquid collecting tank. A reaction gas-liquid reaction is conducted in the single-tower five-section gradient purification, sulfur removal and dust removal ultra-low emission integrated device, the reaction speed is high, the reaction is complete, and the sulfur removal efficiency is high. The system meets the ultra-low emission requirements, and is simple in structure, easy to achieve, low in cost and beneficial for wide utilization and popularization.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a single-tower five-stage cascade purification, desulfurization and dust removal integrated device with ultra-low emissions. 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 classificati...

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Problems solved by technology

[0005] 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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