Wet oxidation multi-stage washing desulfurization process and device

Abstract

The invention relates to a wet oxidation multi-stage washing desulfurization process and a device. The process is characterized in that staged washing desulfurization is performed on coal gas through multi-channel desulfurization liquid of desulfurization circulating liquid, desulfurization regeneration semi-lean liquid, and desulfurization regeneration lean liquid; the desulfurization regeneration semi-lean liquid output from the bottom of a regeneration tank or a regeneration tower, or the desulfurization circulating liquid of a desulfurization tower is used for washing the initial coal gas containing high-concentration hydrogen sulfide in the lower segment of the desulfurization tower; then the high-quality desulfurization regeneration lean liquid output from the upper end of the regeneration tank or the regeneration tower is used for washing the coal gas subjected to lower-segment initial desulfurization in the upper segment of the desulfurization tower to complete fine desulfurization. Compared with the prior art, the process has the beneficial effects that the staged washing is performed to absorb the hydrogen sulfide in the coal gas to realize desulfurization by using the desulfurization circulating liquid, or the desulfurization regeneration semi-lean liquid, or the desulfurization regeneration lean liquid; the regeneration amount of the desulfurization liquid is reduced; the use amount of regeneration air is reduced; exhaust emission is reduced; the desulfurization efficiency is improved.

Description

technical field [0001] The invention relates to the field of coke oven gas wet oxidation desulfurization, in particular to a wet oxidation multi-stage washing desulfurization process and device. Background technique [0002] The wet oxidation desulfurization process is widely used in the coke oven gas purification process due to its advantages of high desulfurization and dehydrogenation efficiency, simple process, and simple operation. There are two methods of desulfurization liquid regeneration: injection tank regeneration and regeneration tower compressed air regeneration. , the current desulfurization process is that all the desulfurization liquid is sent to the injection tank or the regeneration tower for regeneration. After regeneration, the desulfurization lean liquid enters the desulfurization tower to wash the gas to absorb the hydrogen sulfide in the gas, and all the desulfurization liquid from the desulfurization tower goes to the regeneration cycle. The large amou...

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Problems solved by technology

[0002] The wet oxidation desulfurization process is widely used in the coke oven gas purification process due to its advantages of high desulfurization and dehydrogenation efficiency, simple process, and simple operation. There are two methods of desulfurization liquid regeneration: injection tank regeneration and regeneration tower compressed air regeneration. , the current desulfurization process is that all the desulfurization liquid is sent to the injection tank or the regeneration tower for regeneration. After regeneration, the desulfurization lean liquid enters the desulfurization tower to wash the gas to absorb the hydrogen sulfide in the gas, and all the desulfurization liquid from the desulfurization tower goes to the regeneration cycle. The large amount of desulfurization liquid, the large amount of regeneration gas (air) required to ensure the regeneration residence time and gas intensity, the large volume of the injection tank or the regeneration tower, etc., with the large-scale coke oven, the single-system processing capacity of gas desulfurization is also increasing. Upsizing, from the previous gas volume of 30,000 m 3 / h~60,000m 3 / h increased to 120,000 m 3 / h~200,000m 3 / h, the large-scale problem is becoming more and more prominent. With the increasing use of high-sulfur gas in coking plants to reduce costs, the hydrogen sulfide content in the gas is usually from 3g to 5g / m 3 Generally increased to 8g ~ 10g / m 3 , it is necessary to increase the circulating volume of desulfurization liquid to further increase the regeneration pressure

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