Process of extracting side salt from desulfurized liquid

A technology of desulfurization liquid and auxiliary salt, which is applied in the direction of liquid washing gas purification, etc., can solve the problems of waste of new water resources, non-conformity with circular economy and clean production, and white loss, so as to increase benefits, achieve significant effects of circular economy, and realize circular The effect of using

Inactive Publication Date: 2007-11-07
SHANDONG IRON & STEEL CO LTD
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Problems solved by technology

This way of discharging part of the waste liquid into the coal storage will cause the sulfide to re-enter the gas, resulting in a vicious circle, and a lot of new water resources are wasted, and the two secondary salts with high added value are lost in vain, which is extremely unsatisfactory. Meet the requirements of circular economy and clean production

Method used

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  • Process of extracting side salt from desulfurized liquid

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Embodiment Construction

[0017] As shown in the picture.

[0018] After the desulfurization system has been in operation for a period of time, the auxiliary salt in the system will gradually increase, and when it rises to a certain level, it will affect the absorption of hydrogen sulfide and the formation of sulfur foam. In order to reduce the auxiliary salt in the desulfurization liquid, the part of the desulfurization liquid in the two wet desulfurization operations is led to the desulfurization liquid storage tank, and the desulfurization liquid is sent to the salt extraction station through self-pressure or pumps.

[0019] The desulfurization liquid is left to stand in the desulfurization liquid storage tank for 24 hours, and the time can be controlled between 22-26 hours. The insoluble matter in the desulfurization liquid is separated by precipitation, and then sent to the decolorization kettle through the raw material pump.

[0020] In the decolorization kettle, add activated carbon for decolori...

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Abstract

The process of extracting side salt from the desulfurized liquid belongs to the field of coal gas purifying technology. The desulfurized liquid is treated through depositing, decolorizing and evaporating to cool so as to obtain the mixture containing (NH4)2S2O3 and NH4CNS as two side produced salts in the content over 90 %. The evaporated ammonia-containing condensated water is returned to the desulfurized liquid for lowering its side salt concentration. The process can obtain side salts with high value without increasing water consumption, raise desulfurizing efficiency and realize the circular use of desulfurized liquid.

Description

technical field [0001] The invention relates to the field of desulfurization in the gas purification process, and is especially suitable for (NH 4 ) 2 S 2 o 3 , NH 4 Treatment of secondary salts such as CNS. Background technique [0002] At present, the desulfurization in the domestic gas purification process is divided into wet desulfurization and dry desulfurization. In the wet desulfurization project, a large part of the desulfurization technology uses various alkalis or ammonia water as the alkali source. The desulfurization liquid absorbs the hydrogen sulfide in the gas, and then puts out the sulfide or elemental sulfur in the desulfurization liquid by introducing air replacement, and then carries out subsequent processing of the sulfide, and the desulfurization liquid after the desulfurization is recycled and used . [0003] In the above desulfurization process, many side reactions will occur in the desulfurization liquid during recycling, and a large amount of (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/08
Inventor 朱玉廷康春清祝仰勇李维忠孟凡刚赵文江张顺贤
Owner SHANDONG IRON & STEEL CO LTD
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