Flue gas desulfurization system

Abstract

The present invention relates to the technical field of flue gas desulfurization, and discloses a flue gas desulfurization system, which comprises a tower body, the bottom of the tower body is provided with a liquid storage cavity for storing a limestone solution, the side wall of the tower body is provided with a flue gas inlet, the tower body is internally provided with a first spraying layer and a second spraying layer, the top of the tower body is provided with an exhaust port, and the top of the tower body is provided with a gas outlet. The first spraying layer and the second spraying layer are located between the flue gas inlet and the exhaust port, the first spraying layer is used for spraying a calcium hydroxide solution, the second spraying layer is communicated with the liquid storage cavity, and the side wall of the liquid storage cavity is connected with an oxidation fan and a gypsum discharge assembly. According to the desulfurization tower, the first spraying layer and the second spraying layer are arranged in the tower body, the first spraying layer is used for spraying a calcium hydroxide solution, and the second spraying layer is communicated with the liquid storage cavity, so that no carbon dioxide is discharged in the whole desulfurization process, low carbon emission in the absorption process is realized, and the flue gas treatment result is improved.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a flue gas desulfurization system. Background technique [0002] Existing thermal power group flue gas desulfurization projects usually use limestone-gypsum wet flue gas desulfurization process, and the desulfurization efficiency guarantee value of the desulfurization device is greater than 93%. One furnace and one tower system is adopted. The FGD unit adopts wet forced oxidation and limestone-gypsum recovery process. However, for the removal of SO 2 The slurry is collected in the absorption tower slurry tank, which is divided into oxidation zone and crystallization zone. In the upper oxidation zone, oxidizing air is blown in through a distribution system to generate gypsum in a slurry with a pH value of 4.5 to 5.5; in the crystallization zone, the gypsum crystal seeds gradually increase and form larger crystals that are easy to dehydrate. New limestone slurr...

AI Technical Summary

Problems solved by technology

In the upper oxidation zone, oxidizing air is blown in through a distribution system to generate gypsum in a slurry with a pH value of 4.5 to 5.5; in the crystallization zone, the gypsum crystal seeds gradually increase and form larger crystals that are easy to dehydrate. New limestone slurry was also added to this area, the overall chemical reaction formula: CaCO 3 +SO 2 +1 / 2O 2 +2H 2 O→CaSO 4 2H 2 O+CO 2 , it can be seen from the chemical reaction process that in the removal of SO 2 process, will generate CO 2 , increased greenhouse gas emissions, and poor tail gas treatment results

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