Method used for increasing desulfuration denitration and demercuration efficiency

Abstract

The invention discloses a method used for increasing desulfuration denitration and demercuration efficiency. According to the method, a desulfuration denitration demercuration liquid and foam generation system is arranged aside an original flue gas processing system; a slurry pump is connected with a slurry tank (pond) and a liquid foam generator; a foaming agent pump is connected with a foaming agent tank and the liquid foam generator; a bypass flue duct is connected with a main gas flue and the liquid foam generator; desulfuration denitration demercuration slurry in the slurry tank (pond) is pumped into the liquid foam generator via the slurry pump; a foaming agent liquid in the foaming agent tank is pumped into the liquid foam generator via the foaming agent pump; dynamic air is delivered into the liquid foam generator via a dynamic fan, so as to realize hard impact on an aqueous solution rich in fresh foaming agent and fresh desulfuration denitration demercuration agent, and a large amount of liquid foam is generated; the liquid foam is delivered into the main gas flue via the bypass flue duct, and is fully contacted with flue gas, wherein the surface of the liquid foam is rich in the desulfuration denitration demercuration agent, so that desulfuration denitration demercuration reaction is realized; and flue gas is continuously delivered into the original flue gas processing system for secondary desulfuration denitration demercuration. Desulfuration denitration demercuration efficiency is increased, replacing or modifying of the original flue gas processing system is avoided, and investment cost is reduced.

Description

technical field [0001] The invention relates to a method for improving the efficiency of desulfurization, denitrification and mercury removal, in particular to a method capable of greatly improving the efficiency of wet desulfurization, denitrification and mercury removal, and belongs to the technical field of environmental protection. Background technique [0002] Existing flue gas treatment technologies mainly include dust removal technology, desulfurization technology, and denitrification technology. Desulfurization technologies mainly include dry method, semi-dry method and wet method. Due to the high investment cost of dry method and semi-dry method, complex operation, many failures, and especially low desulfurization rate, the current flue gas desulfurization technology is mainly based on wet method. Common desulfurization technologies such as granite water film tower, swirl tower, sieve plate tower, bubble tower, and spray tower have the common characteristics of less...

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Problems solved by technology

[0003] In order to overcome the disadvantages of the existing desulfurization, denitrification and demercury devices that have low desulfurization, denitrification and mercury removal efficiency that cannot meet environmental protection requirements, and that new or modified original desulfurization, denitrification and mercury removal devices have high investment costs, the present invention provides an improved wet desulfurization, denitrification and demercuration device. Efficiency method, this method is to add a bypass flue to the main flue before the original flue gas treatment system, the bypass flue is connected with the desulfurization, denitrification and demercuration vacuole generation system, the desulfurization, denitrification and demercuration vacuole generation system can generate a large amount of rich The strongly oxidized alkaline vacuole of the desulfurization, denitrification and mercury removal agent maximizes the specific surface area of ​​the absorption slurry. The strong oxidative alkaline vacuole flows into the main flue through the bypass flue, and the absorption slurry contained in the strong oxidative alkaline vacuole and the sulfur dioxide in the flue gas , nitrogen oxides, and mercury ions are fully contacted and chemically reacted to remove sulfur dioxide, nitrogen oxides, and mercury ions in the flue gas. Mercury removal, thereby greatly improving the efficiency of desulfurization, denitrification and mercury removal, and ensuring that the flue gas discharge meets the standard

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