A kind of preparation method of synthesis gas

Abstract

A synthesis gas preparation method is to pass coke oven gas and part of the coal-based gas into the gas cabinet for mixing, and the other part of the coal-based gas to undergo methane reforming for reforming, and then combine the reformed gas with the mixed gas passed through the gas cabinet and compress it. Purify, remove impurities such as H2S and remaining CO2, remove hydrogen sulfide, desulfurize and recover, and remove CO2 gas to vent. The purified raw material gas is subjected to methane separation, and the methane gas is separated to produce liquefied natural gas products or compressed natural gas products, and the methane gas is separated to obtain pure synthesis gas that meets the requirements of the hydrogen-carbon ratio of the downstream products of the synthesis. The invention has the advantage of realizing comprehensive utilization of coal gas and coke oven gas.

Description

technical field [0001] The invention belongs to a method for preparing synthesis gas. technical background [0002] Synthesis gas is a kind of raw material gas with carbon monoxide and hydrogen as the main components, which is used as a chemical raw material. Syngas is widely used and is the most basic raw material for synthetic ammonia, natural gas, methanol, ethylene glycol, light olefins, synthetic oil and other products. Syngas has a wide range of raw materials. It is produced by the gasification of carbonaceous minerals such as solid fuels such as coal and charcoal. It can also be produced from light hydrocarbons such as natural gas and naphtha. It can also be produced from heavy oil through partial oxidation. [0003] The composition (volume %) of synthesis gas produced by various methods is very different: H2: 32-67, CO: 10-57, CO2: 2-28, CH4: 0.1-14, N2: 0.6-23. In addition, there are trace amounts of harmful components such as H2S, COS, and HCN. The synthesis gas...

AI Technical Summary

Problems solved by technology

At present, in addition to the production of synthetic ammonia and methanol, coke oven gas has a surplus of nearly 30 billion cubic meters of coke oven gas per year. Due to the characteristics of "more hydrogen and less carbon" in the composition of coke oven gas, the energy utilization rate of coke oven gas at this stage is about 55%. , resulting in huge waste of energy and environmental pollution

[0005] From the characteristics of coke oven gas and coal-to-gas, it can be seen that the production of synthetic ammonia, natural gas, methanol, ethylene glycol, low-carbon olefins, synthetic oil and other products from coke oven gas or coal-to-gas alone has unbalanced component ratios and utilization Insufficient problem: Coke oven gas has more hydrogen and less carbon, and if it is used alone for synthetic products, there will inevitably be a large amount of hydrogen surplus, or additional carbon sources need to be added; while coal-based gas has more carbon and less hydrogen, and if it is used alone, there will be a large amount of carbon surplus, or Requires an additional large amount of supplemental hydrogen source

[0006] At present, in actual production, for the characteristics of coal-based gas with more carbon and less hydrogen, a reasonable hydrogen-carbon ratio is generally obtained through water vapor shift; coke oven gas has more hydrogen and less carbon, and high methane content, and methane carbon dioxide reforming is usually used However, whether it is water-steam shift or methane reforming, there are problems such as high investment, high energy consumption, and complicated operation.

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