Dry-wet purifying recovery treatment process of smoke gas

Abstract

The invention provides a dry-wet purifying recovery treatment process of smoke gas. The dry-wet purifying recovery treatment process is characterized in that blowing smoke gas and a dry powder absorbant enter a grinding machine with a high-pressure induced draft fan for crushing treatment, and the crushed absorbant is delivered into a grader with an air flow; a screened gas-powder mixture enters a main flue to be reacted with the smoke gas inside the main flue so that the primary purification of the smoke gas is realized; the smoke gas subjected to the primary purification enters an absorption tower from the main flue and is subjected to wet purification and then directly discharged; and waste liquor inside the absorption tower is flocculated, then clear liquor enters a reactor to be reacted with ammonium hydrogen carbonate, after the reaction is finished, an obtained solid as an absorbant is recycled to a smoke gas purifying section, the clear liquor, which is obtained after liquor is cooled and crystallized, as a raw material solution enters an evaporation system, and an ammonium salt crystal obtained through evaporation and crystallization is recycled.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a dry-wet purification recovery treatment process for flue gas. Background technique [0002] In recent years, as air pollution has become more and more serious, people have put forward higher requirements for the treatment of flue gas, especially coal-fired flue gas; Emission Standards for Waste Gases (GB 13223-2011), which puts forward new emission limits for soot, sulfur dioxide, and nitrogen oxides in flue gas. At present, the effective methods of flue gas desulfurization are wet flue gas desulfurization such as ammonia method and sodium method. The above desulfurization methods all produce a certain concentration of waste liquid containing sulfate and nitrate. It has the characteristics of high salt content and partial acidity, and the effluent quality is difficult to meet the discharge standard when treated by ordinary methods. The development of new treatme...

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Problems solved by technology

[0003] From the existing patent documents CN102489129A (industrial flue gas purification, desulfurization and denitrification integrated device and its working method, 2012.06.13), CN203108424U (a flue gas treatment device for simultaneous desulfurization and denitrification, 2013.08.07), we know that combined desulfurization Denitrification technology has gradually become the development direction of flue gas treatment, but this kind of integrated flue gas desulfurization and denitrification technology is often not mature enough. SO in Dao gas 2 or NO X For rough purification, the methods used include ozone injection, cooling, absorbents, etc., such as patent documents CN102363095A (flue gas dry desulfurization process and flue gas dry desulfurization system, 2012.02.29), CN103990375A (a semi Dry sintering flue gas integrated purification method, 2014.08.20), etc., in the actual use process, its treatment efficiency is not obvious from the whole desulfurization (denitrification) process, so their industrial application is not obvious. not obvious

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