Synthetic raw material gas deep fine desulfurization process and fine desulfurization device

Abstract

The invention discloses a deep desulfurization method for preparing a synthetic raw material gas by taking a coal-based natural gas, a petroleum refining gas, a coke oven gas, a steel mill converter gas and the like as raw materials. The method comprises the step of enabling the raw material gas which is treated by rough desulfurization and contains hundreds of parts per million (ppm) of H2S and hundreds of ppm of organic sulfur (including COS, CS2, sulfur alcohol, sulfur ether, thiophene and the like) to pass through a plurality of stages of titanium-based molybdenum-cobalt catalysts, a plurality of stages of zinc oxide desulfurizing agents and a stage of multifunctional fine desulfurizing agent to enable the total sulfur to be less than or equal to 0.01ppm. Compared with the existing desulfurization accuracy (0.1ppm), the desulfurization accuracy of the deep desulfurization method enables the degree of purification to be increased by one order of magnitude and enables the service life of a methyl alcohol catalyst to be doubled. The invention also discloses a medium-temperature fine desulfurization device used by the synthetic raw material gas deep fine desulfurization method. For the industrial community, after the method and the device are used, the starting and stopping times of the device can be reduced, the raw material and the power consumption are reduced, the yield of the device is increased, and an effective measure capable of saving energy, reducing emission and increasing yield can be provided.

Description

technical field [0001] The invention relates to gas purification in chemical engineering, belongs to the field of "energy saving and emission reduction", and specifically relates to a deep fine desulfurization process of synthetic raw material gas and a device thereof. Background technique [0002] In the existing technology, coal gas, coke oven gas, petroleum refinery gas, steel plant converter gas and natural gas are used as raw materials to produce synthetic raw material gas. Large and medium-sized methanol plants, synthetic ammonia plants, and synthetic oil plants have refined desulfurization process. Large-scale plants use low-temperature methanol washing and NHD method, and medium-sized plants use dry fine desulfurization (including normal and medium temperature fine desulfurization). These methods make the total sulfur in the synthetic feed gas less than or equal to 0.1ppm, which can ensure that the life of the catalyst for synthesizing methanol is 2-3 years, the lif...

AI Technical Summary

Problems solved by technology

[0003] In the document CN101224871B, a deep purification method of synthesis gas is proposed, which is characterized in that the operating temperature of the first process is normal temperature, and secondly, the catalyst selected is a hydrolysis catalyst, which can only convert COS, CS 2 Hydrolyzed to H 2 S is removed, and the complex organic sulfur such as mercaptan, sulfide, thiophene, etc. in the synthetic raw material gas cannot be removed

In addition, the scope of this patent can only be used after the existing fine desulfurization, that is, under the condition that the total sulfur in the synthesis gas is ≤0.1ppm

The use of this method has great limitations

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