Flue gas desulphurization system for boiler

Abstract

The invention discloses a flue gas desulphurization system for a boiler, and belongs to the technical field of environmental protection of flue gas desulphurization. The flue gas desulphurization system comprises a desulphurization tower, a draught fan and a chimney, wherein the desulphurization tower, the draught fan and the chimney are connected in sequence; the desulphurization tower consists of a desulphurization primary tower and a desulphurization secondary tower; the top of the desulphurization primary tower is communicated with the top of the desulphurization secondary tower; the bottom of the desulphurization primary tower is provided with a flue gas inlet pipe; the bottom of the desulphurization secondary tower is provided with a flue gas outlet pipe; the flue gas outlet pipe is communicated with the draught fan; the lower part of the desulphurization primary tower is provided with a water-film processor; the water-film processor is arranged above the flue gas inlet pipe; the bottom of the desulphurization primary tower is provided with a grey water ditch; the grey water ditch is communicated with a sedimentation tank; supernatant fluid in the sedimentation tank is pumped into the water-film processor through a clear water pump; the upper part of the desulphurization primary tower is provided with multiple stages of lime slurry spraying pipes; a dehydrator is arranged in the desulphurization secondary tower. By using the flue gas desulphurization system for the boiler, which is provided by the invention, harmful gases of SO3, chloride, fluoride and the like can be effectively removed; the removal rate reaches 95 percent or above.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization environmental protection, in particular to a boiler flue gas desulfurization system. Background technique [0002] At present and for a long period of time in the future, China's energy structure is dominated by coal, and the flue gas emitted by coal-fired boilers contains a large amount of SO 2 , has caused great harm to the pollution of the environment. [0003] SO 2 Soaring emissions make most cities SO 2 The concentration is at a high pollution level. SO 2 The increase in emissions has led to an abnormally rapid increase in acid rain in China. Severe acid rain and fragile ecosystems have caused serious economic losses in my country. The direct economic losses caused by acid rain pollution to forests and crops have reached tens of billions of yuan. If not strictly controlled, my country's SO 2 Emissions will continue to increase, SO 2 And acid rain pollution will serious...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a boiler flue gas desulfurization system, which solves the problem that the height of the absorption tower is continuously increased due to the continuous increase of the number of spray layers in the existing spray tower

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