Coke oven gas desulfurization process

Abstract

The invention discloses a coke oven gas desulfurization process, which adopts a stronger ammonia water desulfurization process, separates a coal gas desulfurization process from a deamination process, utilizes an ammonia resource of coal gas as an alkali source for desulfurization, utilizes high-temperature concentrated ammonia gas at the top of an ammonia still to be introduced into a negative-pressure deacidification tower as a heat source for deacidification, and has the advantages of low energy consumption and good desulfurization effect. After being cooled, the waste gas of the process is sent to the coal gas negative pressure system, so that secondary pollution is avoided. The purified acid gas is used for producing sulfur by using a Claus furnace, the product quality is high, and the environment is clean. The whole system has no wastewater difficult to treat.

Description

technical field [0001] The invention relates to a coke oven gas desulfurization process, which belongs to the technical field of coal cleaning. Background technique [0002] More than half of my country's proven coal reserves are low-rank coals, and the volatile matter contained in them is equivalent to 100 billion tons of oil and gas resources. Low-rank coal mainly has the material characteristics of high moisture and high volatility. When burning, the flame is long and smokey, and the degree of coalification is low. Typical coal types are lignite and long-flame coal. The main way to use coal is direct combustion or gasification. During the combustion process, a large amount of sulfur dioxide is usually produced. If the sulfur dioxide in the flue gas is not treated, it will be directly discharged into the atmosphere, which will easily form acid rain and affect the atmospheric environment. [0003] my country's environmental protection requirements chimney SO 2 Emission le...

AI Technical Summary

Problems solved by technology

The existing coke oven gas desulfurization process includes AS ammonia washing and desulfurization integrated process, HPF desulfurization process, vacuum potassium carbonate desulfurization process, AS ammonia washing and desulfurization integrated process, due to the mutual influence of ammonia washing and desulfurization processes, desulfurization and deammonization cannot be guaranteed Both have achieved good results. When the ammonia-rich liquid contains high ammonia, it will affect the deammonization effect of the gas, but it is beneficial to desulfurization; if the ammonia-rich water contains low ammonia, it is beneficial to deamination, but not desulfurization.

The HPF desulfurization process also uses ammonia water to desulfurize, but it uses a wet catalytic oxidation method, which produces a large amount of waste gas and secondary salts, and the quality of the sulfur paste is also poor, and the environmental quality is poor

Vacuum potassium carbonate desulfurization process consumes a lot of lye and produces some waste liquid

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