Raw gas recycling system and method

Abstract

The invention discloses a raw gas recycling system. The raw gas recycling system comprises a coking device, a chemical production device, an adsorption hydrogen production device, a purification hydrogen production device, a polyvinyl chloride production device, a methanol production device and a methanol to olefin device; raw gas produced by the coking device is purified by the chemical production device to obtain coke oven gas; the coke oven gas is prepared into hydrogen with purity of 99.5% through the adsorption hydrogen production device; a part of the hydrogen with the purity of 99.5% isprovided to the polyvinyl chloride production device and the methanol production device to be used as a raw material; the other part of the hydrogen with the purity of 99.5% passes is prepared into high-purity hydrogen with purity of 99.9% or above through the purification hydrogen production device, and the high-purity hydrogen is provided to the methanol to olefin device be used as a raw material. According to the raw gas recycling system provided by the invention, hydrogen with a relatively high content in the raw gas is separated out, and the hydrogen with different purity is provided todifferent material production devices, so that comprehensive resource utilization and high-efficiency recycling are realized.

Description

technical field [0001] The invention relates to the technical field of resource comprehensive utilization of chemical products, in particular to a waste gas recovery and utilization system and method. Background technique [0002] Raw coal gas is a by-product produced in the coking process of the coking plant. Taking the 2.4 million tons / year coking plant as an example, four reheating type coke ovens can produce 140,000 Nm of raw coal gas by-product 3 / h, the composition of raw coal gas is relatively complex, and the yield and composition vary with the quality of coking coal and the coking process, mainly including H 2 、CH 4 , CO, N 2 , CO 2 、C m h n , O 2 , and naphthalene, tar, crude benzene, hydrogen sulfide, hydrogen cyanide and other substances. Because raw coal gas contains a large amount of hydrogen, if it is directly discharged or burned as industrial or civil fuel, it will not only waste hydrogen resources, but also pollute the atmosphere. [0003] When recy...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a raw coal gas recovery and utilization system and its method, which are used to solve the problem that the hydrogen content in raw coal gas is high and it is difficult to fully utilize it

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