Pressure reduction gas desulfurization method

Abstract

The invention relates to a pressure reduction gas desulfurization method which belongs to the technical field of chemical technology. The pressure reduction gas desulfurization method comprises the following steps of: firstly, performing injection desulfurization with an absorbent; secondly, performing absorption desulfurization with an absorbent in a recycling tank; and then performing absorption again with absorbing structured packing after absorption desulfurization. In the specific operations of the vacuum gas desulfurization method, the absorbent is recycled through a circulation line; a circulating pump and the recycling tank are connected to the circulation line; an injector is connected to an upstream circulation line of the recycling tank; sulfur-contained gas is connected to the injector; and the top of the recycling tank is provided with a clean gas outlet. The pressure reduction gas desulfurization method has the advantages of simple process, convenience of operation, low construction investment and low failure rate. Moreover, the content of hydrogen sulfide after gas desulfurization can be reduced to be less than 500ppm, thus the desulfurization and purification effects are good and the desulfurization efficiency is high.

Description

technical field [0001] The invention relates to a desulfurization method for vacuum gas, which belongs to the technical field of chemical industry. Background technique [0002] The decompression gas in the decompression device of the refinery contains a high amount of hydrogen sulfide, some as high as 20%. At present, it is directly burned into the heating furnace without desulfurization. Due to the hydrogen sulfide content, it not only severely corrodes the heating furnace and pipelines, but also is not conducive to the long-term life of the device. operation, but also not conducive to environmental protection. If a compressor is used to directly increase the pressure of the decompressed gas, the corrosion of the compressor will be serious. There is also a process in which vacuum gas is directly desulfurized by amine liquid and then boosted by a compressor, but because the pressure is too low, the desulfurization effect is poor, and the hydrogen sulfide content is about 2...

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Problems solved by technology

[0002] The decompression gas in the decompression device of the refinery contains a high amount of hydrogen sulfide, some as high as 20%. At present, it is directly burned into the heating furnace without desulfurization. Due to the hydrogen sulfide content, it not only severely corrodes the heating furnace and pipelines, but also is not conducive to the long-term life of the device. operation, but also not conducive to environmental protection

If a compressor is used to directly increase the pressure of the decompressed gas, the corrosion of the compressor is also very serious

There is also a process of desulfurizing the decompressed gas directly with amine liquid and then boosting the pressure through the compressor, but because the pressure is too low, the desulfurization effect is very poor, and the hydrogen sulfide content is about 2000ppm

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