Fume desulfurizing process employing multiple circulation and stable double alkali method and apparatus

Abstract

The invention relates to field of atmosphere pollution control and treatment, especially relates to a process of multiple circulate and stable flue gas desulfurization by means of double aluminium subsulfate. It is characterized in that it comprises: desulfurizing absorption liquid internal cycle, external cycle, internal cycle of desulfurizing slag, internal cycle of desulfurizing agent, and external cycle of desulfurizing salg. The invention also relates to the device for said process. THe invention is characateized by stable process, low investment, high desulfurizing rate and low operating cost.

Description

technical field [0001] The invention relates to the field of air pollution control and treatment, in particular to a multi-cycle stable double-alkali flue gas desulfurization process. The invention also relates to a device for realizing the multi-cycle stable double-alkali flue gas desulfurization process. Background technique [0002] In 1850, the United Kingdom began to engage in the research of flue gas desulfurization technology, and in 1931, the first desulfurization project began. At present, there are more than 30 desulfurization technologies in the world. Desulfurization technology is divided into two categories: non-regenerative desulfurization technology and regenerative desulfurization technology according to whether sulfur dioxide is recycled or not. Non-regenerative desulfurization technology is divided into wet desulfurization technology, semi-dry desulfurization technology and dry desulfurization technology. Wet desulfurization technology is the only large-sc...

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Problems solved by technology

Ordinary double-alkali method has a higher efficiency, up to about 70%. The absorption tower adopts plate tower or packed tower. The flue gas desulfurization process of concentrated alkali double-alkali method has high oxidation side reactions due to the high concentration of sodium sulfite in the tower and high concentration of desulfurization slag entrainment. Therefore, a large amount of sodium alkali needs to be supplemented in the system, and 0.2mol of sodium alkali needs to be supplemented for every 1mol of sulfur dioxide removed, so the operating cost is very high; the ordinary double alkali method also has the system balance that is easy to destroy, the system operation is unstable, and the desulfurization slag Difficult to handle, low utilization rate of lime, difficult maintenance of tower internals, easy fouling and clogging of reaction tank, etc.

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