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Method for desulphurizing sulfur-containing flue gas with coking crude gas water-washing deaminized ammonia water

A crude gas and water elution technology, applied in chemical instruments and methods, separation methods, applications, etc., can solve the problems of high operating costs, large investment, and low added value of products

Inactive Publication Date: 2010-12-01
山西新唐工程设计股份有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

Calcium and magnesium desulfurization equipment requires large investment, high operating costs, complex by-products, difficult treatment, and low product added value

Method used

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  • Method for desulphurizing sulfur-containing flue gas with coking crude gas water-washing deaminized ammonia water

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Embodiment Construction

[0017] like figure 1 After the coke oven crude gas is desulfurized, the temperature is about 25°C, and it enters the tower from the bottom of the deammonization scrubber. At the same time, soft water and circulating lean ammonia water are sprayed down from the top of the deammonization scrubber to wash the crude gas. Ammonia, until the ammonia content in the gas is less than 30mg / Nm 3 Finally, it is sent out of the deammonization washing tower, and the rich ammonia water with an ammonia concentration of more than 1% after ammonia washing is also discharged out of the tower.

[0018] The sulfur-containing flue gas from the boiler or other places is sent to the desulfurization tower from the bottom of the desulfurization tower through the fan after being dedusted by the dust collector, and at the same time, the above-mentioned ammonia-rich water after ammonia washing is sprayed into the tower from the top , in the process of falling, it is in reverse contact with the bottom-up ...

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Abstract

The invention relates to a method for desulphurizing sulfur-containing flue gas with coking crude gas water-washing deaminized ammonia water, which comprises the following steps: introducing coke furnace crude gas into a deamination washing tower to obtain ammonia-enriched water after water washing of ammonia, and discharging the ammonia-enriched water out of the tower; introducing sulfur-containing flue gas into a desulfurizing tower from the bottom of the desulfurizing tower, spraying the ammonia-enriched water into the tower from the tower top to absorb SO2 in the flue gas so as to generate an ammonium sulfite solution, discharging the ammonium sulfite solution from the tower bottom, and discharging the desulphurized flue gas from the tower top; and using the ammonium sulfite solution to produce chemical fertilizer ammonium sulfate by the conventional technology. The method for desulphurizing sulfur-containing flue gas combines coking plant crude gas water-washing deamination and sulfur-containing flue gas ammonia desulfurization, and omits the ammonia evaporation procedure in the water-washing deamination. Besides, the ammonia water is wholly and effectively utilized, and can be used by being combined with flue gas desulfurization for producing chemical fertilizer ammonium sulfate without producing new three wastes, thereby achieving the purposes of energy saving, consumption reduction and environmental friendliness.

Description

technical field [0001] The invention relates to a method for desulfurizing sulfur-containing flue gas, in particular to a method for comprehensively utilizing ammonia water obtained by washing and removing ammonia from crude gas purification in a coking plant to desulfurize sulfur-containing flue gas. Background technique [0002] In the purification process of crude gas produced by coal coking, it is very harmful if the ammonia in the coke oven gas is not recycled. If it is dissolved in water and not recycled, it will seriously pollute the water body. If it is burned with the gas, it will produce a large amount of NOx that pollutes the air. Therefore, The ammonia in the gas must be removed and recovered. [0003] At present, the processes for recovering ammonia from coke oven gas mainly include: [0004] 1), washing ammonia with water to obtain rich ammonia water with a mass concentration of more than 1%, and then obtaining concentrated ammonia water with a concentration o...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50C01C1/245C05C3/00
CPCY02P20/10
Inventor 李红兵段殿勇林纲陈学伟
Owner 山西新唐工程设计股份有限公司
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