A coke oven gas desulfurization process

Abstract

The invention discloses a coke oven gas desulfurization process, which adopts a concentrated ammonia water desulfurization process, separates the gas desulfurization and the desulfurization process, utilizes the ammonia resources of the gas itself as an alkali source for desulfurization, and utilizes the high-temperature concentrated ammonia gas at the top of an ammonia distillation tower to pass through the desulfurization process. It is fed into the negative pressure deacidification tower as a heat source for deacidification, with low energy consumption and good desulfurization effect. After cooling, the waste gas of this process is sent to the gas negative pressure system, which will not cause secondary pollution. The purified acid gas is used to produce sulphur in Claus furnace, the product quality is high and the environment is clean. The overall system is free of difficult waste water.

Description

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

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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