Process for returning circulating ash to tower during semi-dry desulfurization of electrolytic flue gas

Abstract

The invention discloses a process for returning circulating ash to a tower during semi-dry desulfurization of electrolytic flue gas. The process comprises the steps that: S1, the circulating ash discharged from the lower part of a dust remover falls into a variable-frequency weighing feeder; S2, the circulating ash is weighed through a frequency conversion weighing feeder, and quantitative discharging is conducted on the circulating ash; S3, the circulating ash is conveyed to a circulating ash conveying chute through the variable-frequency weighing feeder; S4, circulating ash is conveyed to an ash inlet of the desulfurization tower through a circulating ash conveying chute; and S5, circulating ash enters the ash inlet of the desulfurization tower and then participates in desulfurization reaction. According to the invention, the overall position of the dust remover is lifted, and the circulating ash is directly conveyed to the ash inlet of the desulfurizing tower through the circulating ash conveying chute under the action of gravity, so that the problems of high energy consumption, powder leakage, material blockage, hardening and the like caused by long-distance conveying are avoided, the system is simpler and more integrated, and the investment and operation cost is saved.

Description

technical field [0001] The invention belongs to the technical field of electrolytic flue gas semi-dry desulfurization, and in particular relates to a circulating ash return tower process for electrolytic flue gas semi-dry desulfurization. Background technique [0002] The circulating fluidized bed flue gas desulfurization technology is to continuously circulate the desulfurizer in the reactor to remove the SO2 in the flue gas. 2 , HF and other gases are fully mixed and contacted and chemical reactions occur, which greatly improves the utilization efficiency of the desulfurizer. With the continuous advancement of technology and the accumulation of experience, the desulfurization efficiency of this method is close to that of the wet method. [0003] For example, the circulating fluidized bed dry flue gas desulfurization device disclosed in the authorized announcement number CN200610118960.3 is characterized by: a cylinder, a rotating stirring device, a desulfurizing agent inl...

AI Technical Summary

Problems solved by technology

The entire conveying process is relatively long, the energy consumption is high, and there will be more phenomena such as powder leakage, material blocking and hardening during the long-distance conveying process, which will result in higher investment and operating costs

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