Novel flue gas desulfurization and denitrification process

Abstract

The invention belongs to the field of flue gas purification and relates to a novel flue gas desulfurization and denitrification process. The novel flue gas desulfurization and denitrification processincludes that flue gas is subjected to pre-dedusting, pre-oxidation, desulfurization and denitrification, after-dedusting and the like. By pre-dedusting, the content of suspended particles in flue gascan be reduced to facilitate subsequent desulfurization and denitrification; by pre-oxidation, NO in the flue gas can be removed while corresponding acids are generated, and the generated acids havereaction with alkali substances to prepare materials required by construction; in the step of desulfurization and denitrification, a novel efficient low-cost desulfurization and denitrification agentis adopted and comprises a mixture of coal gangue, magnesium oxide and sodium carbonate; by after-dedusting of the treated flue gas, dust of the desulfurization and denitrification agent is preventedfrom entering the atmosphere, secondary pollution is avoided, and unreacted desulfurization and denitrification agent can be recovered, so that cost reduction is realized. The novel flue gas desulfurization and denitrification process has advantages of simplicity in operation process, simplicity and convenience in process, low investment and operating cost and recyclability of side products. Therefore, the technical scheme of desulfurization and denitrification has high economic benefits and promising industrial application prospect.

Description

technical field [0001] The invention relates to a flue gas desulfurization and denitrification process, in particular to a multi-stage graded flue gas desulfurization and denitrification method. Background technique [0002] Coal combustion produces a large amount of SO 2 , NO X Flue gas with other components poses a huge threat and damage to the atmospheric environment and human health. Especially in recent years, with the increase of smog weather, people have begun to pay more and more attention to the atmospheric environment, and the requirements for flue gas purification technology are also getting higher and higher. [0003] Desulfurization and denitrification technology refers to the removal of SO from flue gas through some methods 2 , NO X and other components to realize the coordinated control of multi-air pollutants. However, the commonly used methods often separate desulfurization and denitrification, resulting in huge investment in equipment, large site occupa...

AI Technical Summary

Problems solved by technology

However, the commonly used methods often separate desulfurization and denitrification, resulting in huge investment in equipment, large site occupation, and high investment and maintenance costs. Integrated methods include activated carbon method, SNOX process, electron beam method, etc., but at present, these methods all have problems such as high cost, immature process, and many problems in industrialization

[0004] Desulfurization and denitrification technology can be divided into wet method and dry method according to the state of use of desulfurization and denitrification agents. The wet method mainly includes limestone / gypsum method, ammonia method, magnesium method, and seawater desulfurization method, but there are often complex systems and large footprints. , the equipment is severely corroded, and a large amount of waste liquid is difficult to handle, etc.

The dry desulfurization process uses powdered desulfurization and denitrification agents mixed with flue gas for desulfurization and denitrification. Desulfurization and denitrification agents are often expensive, and the dust generated can easily enter the atmosphere and cause secondary pollution.