An integrated desulfurization, denitrification and demercuration flue gas purification system and purification process

Abstract

The invention relates to a smoke gas purification system with an integrated function of desulfuration, denitration and demercuration and a purification process, which are used for treating SOX, NOX and Hg in smoke gas and recycling sulphur and Hg in smoke gas. A uniform gas distribution plate and a flow guide plate are arranged at a smoke gas inlet in the middle of an adsorption tower, a contracting nozzle structure of a central flow collection pipe outlet in the lower section of the adsorption tower is connected with an NH3 inlet, and by the structure improvement, the adsorption tower has the advantages of uniform distribution and mixing of gas, and the smoke gas purification efficiency and the utilization rate of active coke are also improved. Due to a ring-shaped partition plate gas extracting structure of an active coke regeneration tower, no residue is formed in the tower when the regeneration tower desorbs gas; meanwhile, a mercury capturing device is arranged outside the active coke regeneration tower. The characteristic of low content of mercury in smoke gas is taken into account in the smoke gas purification process, active coke is designed for gathering Hg till Hg is saturated and then is regenerated by an acid washing method, and Hg is recycled or subjected to refilling. The smoke gas purification system has the advantages of simultaneous removal of various pollutants, good effect of uniformly distributing smoke gas and high utilization rates of heat energy and by-products, and complete gas exhaust of the regeneration tower is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of flue gas comprehensive treatment, and in particular relates to an integrated desulfurization, denitrification, and mercury removal flue gas purification system and a purification process. Background technique [0002] Although the rapid development of industrialization has brought rapid economic development and improvement of living standards for human beings, it has also led to various environmental pollution problems. Among them, air pollution is one of the most serious environmental problems facing the survival and development of human society. [0003] The flue gas emitted by coal combustion is the main source of air pollution, and specific pollutants include SO X , NO X , mercury, etc. In prior art, for SO X , NO X The research and application of individual control technologies have been implemented, especially for SO X and NO X Some of the control technologies have reached a relatively mature...

AI Technical Summary

Problems solved by technology

[0004] When studying how to solve the problem of mercury pollution, if SO X , NO X , Mercury and other pollutants are treated in stages, there will be problems of high investment, floor space and operation and maintenance costs. Relatively speaking, the comprehensive treatment of multiple pollutants is more feasible

However, there is no relatively mature technology for comprehensive treatment of multi-pollutants (especially multi-pollutants including mercury) in the prior art.

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