Demister washing technology for ethylene spent caustic flue gas desulfurization and demister washing device thereof

Abstract

The invention discloses a demister washing technology for ethylene spent caustic flue gas desulfurization. A demister washing spraying system is arranged below a chimney inside a desulfurizing tower so that dynamic washing spraying can be conducted on a demister. The demister washing spraying system and a main water charging system of a gas desulfurization system are in joint debugging and joint control. When the main water charging system of the desulfurizing tower is insufficient in capacity or breaks down, dynamic washing spraying is controlled to be conducted on the demister, meanwhile, water balance of the whole gas desulfurization system can be maintained in an auxiliary mode, and the liquid level at the bottom of the desulfurizing tower is controlled to be stabilized within a set height range. The invention further provides a demister washing device which is composed of a demister washing water spraying layer, a washing water main pipe and a control switch. By means of the demister washing technology for ethylene spent caustic flue gas desulfurization and the demister washing device thereof, the defects that the demister washing water spraying layers are numerous, and valves and nozzles are also numerous in a traditional desulfurization mode are overcome, the maintenance workload is small, water resources are saved, the demister washing system for ethylene spent caustic flue gas desulfurization is simpler and more practical, the long-period efficient operating requirement is met, and maintaining is more convenient.

Description

technical field [0001] The invention relates to a desulfurization process and its device, in particular to a wet flue gas desulfurization process and device, which are applied in the technical fields of flue gas desulfurization and resources and environment. Background technique [0002] Since the raw flue gas temperature in wet desulfurization is as high as 120°C, after contacting with the desulfurization absorption liquid and undergoing mass transfer and heat transfer, the net flue gas after desulfurization will leave the desulfurization tower with a large amount of saturated water vapor and discharge into the atmosphere. For the water balance of the whole system, process water needs to be replenished in time, otherwise the absorption liquid will be continuously concentrated due to water imbalance, which will eventually lead to crystallization and scaling in the tower, resulting in blockage of demisters and other related equipment and pipelines, and even desulfurization sys...

AI Technical Summary

Problems solved by technology

If ethylene waste caustic soda is used for flue gas desulfurization, the traditional FGD tower pipe fittings and demister flushing will continue to be used. Compared with other desulfurization processes, while achieving and fully meeting the purpose of flushing, water resources have not been saved. The advantages of reducing energy consumption and facilitating equipment maintenance are not obvious

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