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System and process for removing PM2.5 through wet flue gas demercuration and cooperative desulfurization

A technology of PM2.5 and wet desulfurization, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., to achieve the effect of improving the comprehensive treatment of flue gas and avoiding secondary pollution

Active Publication Date: 2014-09-03
SHANGHAI LONGKING ENVIRONMENTAL PROTECTION
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Problems solved by technology

However, my country currently targets mercury and SO in coal-fired flue gas 2 There are few reports on technical systems or equipment that work together with PM2.5 fine particles

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  • System and process for removing PM2.5 through wet flue gas demercuration and cooperative desulfurization

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[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

[0047] In one embodiment of the present invention, the system for wet flue gas demercuration and coordinated desulfurization and PM2.5 includes (1) bag filter 2, which is used to pretreat the flue gas and remove the Large particles; (2) Wet desulfurization absorption tower 3, used for flue gas desulfurization and first-stage mercury removal, mainly through spray slurry spray removal; (3) Oxidation tower 4, used for oxidation of oxidant The flue gas is subjected to the second-stage oxidative mercur...

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Abstract

The invention discloses a system and process for removing PM2.5 through wet flue gas demercuration and cooperative desulfurization. The system comprises a bag type dust collector, a wet desulfurization absorption tower, an oxidation tower, a wet electric precipitator, an oxidizing agent preparation device and an integrated oxidation and demercuration byproduct preparation structure comprising a waste reservoir, a settling pond and a solid-liquid separator. The process comprises the following steps: dissolving and absorbing particulate mercury and Hg<2+> in flue gas on a slurry spraying layer during wet desulfurization, thus realizing first-stage demercuration; further oxidizing elemental Hg0 in the flue gas into Hg<2+> by adopting an oxidizing agent, and dissolving and removing the Hg<2+>; removing residual Hg<2+>, particulate mercury, PM2.5 and acid mist in the flue gas by adopting the wet electric precipitator; and preparing byproducts from oxidation and demercuration liquid wastes by adopting a precipitation separation method. According to the system and process, effective demercuration and cooperative desulfurization and fine particle removal are realized, the byproducts are effectively recycled, secondary pollution is avoided, and a comprehensive flue gas treatment effect is improved.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment technology, in particular to a system and technology for wet flue gas demercuration and coordinated desulfurization and PM2.5 removal. 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 in the 21st century. [0003] my country's coal combustion and mercury emissions both rank first in the world, and coal combustion mercury emissions have become the first man-made mercury pollution source. Due to the volatility, persistence, serious hazards and global pollution of mercury, mercury in coal combustion flue The control of heavy metal pollution has attracted much attention. At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D50/00B01D53/78B01D53/75B01D53/64B01D53/50B01D53/96
Inventor 高继贤张小娟阎冬
Owner SHANGHAI LONGKING ENVIRONMENTAL PROTECTION
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