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

A technology of ethylene waste lye and flushing device, which is applied in the direction of liquid cleaning methods, chemical instruments and methods, cleaning methods and utensils, and can solve the unrealized advantages of saving water resources, reducing energy consumption and facilitating equipment maintenance. and other issues to achieve the effect of meeting long-term efficient operation, reducing leakage points and failure points, and facilitating maintenance

Inactive Publication Date: 2014-03-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this example, see figure 1 , a demister flushing device implementing a demister flushing process for desulfurization of ethylene waste caustic soda, consisting of a demister flushing water spray layer 4, a flushing water main pipe 1 and a flushing control switch, the demister The flushing water spraying pipeline of the flushing water spraying layer 4 is arranged above the uppermost demister 5, and the demister flushing water spraying layer 4 consists of a series of demister rinsing nozzles arranged in a single plane at the same height. On the layer spraying surface, the flushing control switch is independently controlled by the parallel connection of the remote control switch valve 2 and the bypass manual valve 3, wherein the remote control switch valve 2 is a pneumatic or electric switch valve, and the flushing water of the demister is sprayed by controlling the flushing control switch Layer 4 performs dynamic flushing and spraying on the demister 5, and the demiste...

Embodiment 2

[0031] This embodiment is basically the same as Embodiment 1, and the special feature is: the spray angle of each fan-shaped nozzle of the demister flushing water spray layer 4 is 60°, and the water pressure and While ensuring the spraying coverage and uniformity of spraying with a suitable number of nozzles, the structure is simplified, and the number of nozzles is less than that used in Liyiyi. At the same time, it can ensure the dynamic flushing and spraying of the demister and assist in maintaining the entire desulfurization system. The water balance and the need to control the liquid level at the bottom of the desulfurization tower to be stable within the set height range.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B3/02B01D53/78B01D53/48
CPCB08B3/02B01D53/48B01D53/78
Inventor 何仁初程宇光李季魏永涛孙在柏
Owner SHANGHAI UNIV
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