Flue gas purification system and method

Abstract

The invention relates to the field of coal-fired flue gas pollutant purification, and discloses a flue gas purification system and method. The gas purification system comprises a desulphurization tower (10), an oxidation tower (20) and a denitration tower (30) which are communicated in sequence. Oxygen is contained in the oxidation tower. The desulphurization tower is provided with a flue gas inlet used for being communicated with a flue gas delivery pipeline (100), and a first supply device used for supplying a nitrosylsulfuric acid solution into a tower body of the desulphurization tower. The denitration tower is provided with an inlet used for being communicated with an outlet of the oxidation tower, and a second supply device used for supplying a nitric acid solution into a tower body of the denitration tower. According to the gas purification system, as the nitrosylsulfuric acid solution and the nitric acid solution are adopted to remove sulfur dioxide, nitric oxide and mercury, compared with the mode that an FGD process is adopted to carry out desulfurization and then an SCR process is adopted to carry out denitration in the prior art, operating cost is obviously lowered, and equipment investment is small; besides, the occupied area of equipment is small, and the application range is wide.

Description

Technical field [0001] The invention relates to the purification of coal-burning flue gas pollutants, and in particular to a flue gas purification system and method. Background technique [0002] With the development of economy and society, people pay more and more attention to environmental pollution. Among them, the greenhouse effect and acid rain are two important factors that pollute the environment. The atmospheric carbon dioxide (CO 2 ) Is the main cause of the greenhouse effect, while sulfur dioxide (SO 2 ), nitrogen oxides (NO X ) And mercury (Hg) are important factors that cause acid rain, while coal-fired power plants are CO 2 , SO 2 And one of the main emission sources of NOx. Therefore, in order to improve the environment, it is necessary to purify the flue gas emitted by coal-fired power stations. [0003] Currently, for sulfur dioxide (SO 2 ) And nitrogen oxides (NO X ) Removal mostly uses limestone (lime)-gypsum wet desulfurization device (FGD) and selective catalyti...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a flue gas purification system and method to overcome the problems of high cost, huge equipment and difficult resource utilization of a large amount of solid by-products in the prior art

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