Method for producing methanol with coke oven gas

Abstract

The invention relates to a production method for preparing methanol from coke oven gas. The device used by the method comprises a coke oven gas refiner, a pressure swing adsorption hydrogen extractor, a pressure swing adsorption methane extractor, a wet-process decarbonizer, a hydrogen / carbon dioxide gas mixture compressor and a methanol synthesis and rectifying unit. The method comprises the following steps: extracting hydrogen, extracting methane, using exhaust after extracting methane as fuel of a coke furnace and chemical production, extracting CO2 from combustion gas obtained by combusting the exhaust in the coke furnace by using the wet-process decarbonizer, mixing the CO2 and H2, pressurizing by the compressor, and producing the methanol through the methanol synthesis and rectifying unit. The method fully utilizes the characteristics of different components in the coke oven gas, and establishes the new production process for producing methanol from coke oven gas; and the process is scientific, simple and reasonable and can satisfy the heat requirements of coke furnace and chemical production, and the unit heat value of the exhaust is 30% higher than the original coke oven gas used as the fuel, so that the operating conditions of the coke furnace are better than those in the prior art.

Description

technical field [0001] The invention relates to the production field of coal chemical products, in particular to a method of using coke oven gas as a raw material, separating different components in the coke oven gas, and rationally configuring coke oven gas to produce methanol. Background technique [0002] The traditional coke oven gas to methanol process (see figure 2 ), there is a huge waste of resources. Taking 2 million tons of coking to produce 200,000 tons of methanol as an example, the coke oven and chemical industry itself burned nearly half of the coke oven gas, of which only 28,000 Nm of hydrogen was burned 3 / h (excluding methane and carbon monoxide burned off), another 17800 Nm of hydrogen was burned off in the reformer 3 / h, 16600 Nm of hydrogen is burned when the purge gas is used as fuel 3 / h, a total of 60000 Nm of hydrogen was burned 3 / h, but actually only 50,000 Nm of hydrogen is used to synthesize methanol 3 / h. If hydrogen is synthesized into met...

AI Technical Summary

Problems solved by technology

However, as a fuel, the calorific value is very low, and the value of the heat used for burning is less than 0.3 yuan / Nm 3 , the waste caused by burning is huge

Second, methane conversion needs to consume a large amount of water vapor and pure oxygen, and an air separation unit needs to be installed, which requires huge investment and huge energy consumption

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