A coke oven gas fine desulfurization process

Abstract

The invention provides a fine desulfurization process for coke-oven gases. The fine desulfurization process comprises the following steps: treating the coke-oven gas in a deoiling tower and a pre-desulfurizing tower, performing heat exchange with main gas generated after main hydrogen desulfurization, feeding the gas into a pre-hydrogen desulfurization reactor, increasing the temperature through a heater, feeding the gas into a main hydrogen desulfurization reactor, performing heat exchange on a gas obtained after reaction so as to reduce the temperature to 280-360 DEG C, feeding the gas into a medium temperature desulphurization tower to remove H2S and most organic sulfur, further feeding the gas into a medium temperature hydrolysis tower to further convert the organic sulfur such as COS and CS2 into H2S, and finally feeding the gas into a medium temperature fine desulphurization tower in the presence of a medium temperature fine desulfurizing agent. After the coke-oven gases are treated by using the fine desulfurization process, the total sulfur can be reduced to be less than 0.05 mg / Nm<3>, a later synthesis catalyst can be effectively protected, and the service life of the synthesis catalyst can be prolonged.

Description

technical field [0001] The invention relates to a coke oven gas fine desulfurization process. Background technique [0002] Coke oven gas, also known as coke oven gas. Coking coal prepared from several kinds of bituminous coal undergoes high-temperature dry distillation in a coke oven, and produces a combustible gas while producing coke and tar products, which is a by-product of the coking industry. If the coke oven gas is directly discharged into the atmosphere without utilization, this not only wastes scarce energy, but also causes huge pollution to the environment. However, due to the complex composition of coke oven gas and its high sulfide content, the presence of sulfide can easily poison the subsequent conversion and synthesis catalysts, affecting the normal production and operation of production. Therefore, the fine desulfurization of coke oven gas is the premise of its utilization. [0003] At present, the commonly used process for desulfurization of coke oven ga...

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Problems solved by technology

[0004] From the perspective of industrial application, this process has the following disadvantages: (1) The sulfur capacity of the medium-temperature iron oxide (or iron-manganese) desulfurizer is low: the design sulfur capacity of the medium-temperature iron oxide is ≥ 20%, while the actual sulfur capacity is < 10%. 5-8%

The process adopts two-stage hydrodesulfurization, the process is relatively complicated, and the operating cost is high. In the actual operation process, sulfur release, methanation overheating and other phenomena will inevitably occur, and the desulfurization accuracy is not high.

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