Sulfur methanation resistant process for preparing substitute natural gas from coke-oven gas

Abstract

The invention relates to a sulfur methanation resistant process for preparing substitute natural gas from coke-oven gas. The process comprises the steps: enabling raw material gas, which is formed through carrying out carbon supplementing on the coke-oven gas, to enter a slurry bed from the bottom of the slurry bed, carrying out methanation reaction, discharging crude product gas from the top of a slurry-bed reactor, enabling the crude product gas to enter a gas-liquid-solid separator, enabling a separated liquid-solid phase and a catalyst containing an inert medium, which is circulated at the bottom of the slurry reactor, to enter a liquid-solid separator together, discharging a solid phase separated by the liquid-solid separator from the bottom of the liquid-solid separator, and carrying out catalyst regeneration; discharging a liquid phase separated by the liquid-solid separator from the middle-upper part of the liquid-solid separator, and enabling the liquid phase to enter an inert medium storage tank; enabling a regenerated sulfur methanation resistant catalyst to enter the inert medium storage tank, mixing and then pumping a mixture into the slurry-bed reactor by a circulating pump; and purifying the crude product gas separated by the gas-liquid-solid separator, thereby preparing the natural gas. The process has the advantages of high energy source utilization ratio, low equipment investment and operating costs and easiness in operation.

Description

technical field

[0001] The invention belongs to a synthetic natural gas process, in particular to a process for producing synthetic natural gas through sulfur-resistant methanation of coke oven gas. It belongs to the field of new energy utilization technology. Background technique

[0002] my country is the world's largest coke producer, coke production and a large amount of coke oven gas by-product. Part of these coke oven gas is used to make methanol, synthetic ammonia and factory gas, while remote areas are discharged in vain. The current energy utilization rate of coke oven gas is about 55%. According to the characteristics of coke oven gas composition "more hydrogen and less carbon", the use of coke oven gas methanation to synthesize artificial natural gas and by-product hydrogen will have very strong economic competition It can achieve the purpose of improving the energy utilization rate of coke oven gas. At present, in addition to producing synthetic ammonia and me...

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