Separation and recovery system and method of hydrogen from coke oven gas(COG) in steel industry
AssigneeKorea Research Institute of Chemical Technology
InventorsJeong Hoon Kim, Bo Ryoung Park, Ho Cheol Kang
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Abstract
The present invention relates to a system and method for separating and recovering hydrogen from coke oven gas (COG) in steel industry, particularly a system and method for separating and recovering hydrogen at a concentration of 99.9% by volume or more from coke oven gas (COG) in steel industry with a recovery rate of 95% or more.
Claims10
A system for separating and recovering hydrogen from coke oven gas (COG) in steel industry at a concentration of 99.9 volume % or more with a recovery rate of 95% or more, comprising the following units:
- a preprocessing unit for removing impurities including tar, moisture, oil, hydrogen sulfide and dust from coke oven gas (COG) containing hydrogen, methane, carbon monoxide, carbon dioxide, nitrogen, light hydrocarbons and impurities comprising tar, moisture, oil, hydrogen sulfide and dust;
- a membrane separation unit comprising a plurality of separation membrane packages in which at least two separation membrane packages that selectively permeate hydrogen are connected in series, and a single compressor connected to any one of the plurality of separation membrane packages that produces a hydrogen-enriched gas stream at a concentration of at least 95 volume % by recovering hydrogen from the coke oven gas (COG) with a recovery rate of 90% or more through membrane separation of the coke oven gas (COG) treated in the preprocessing unit;
- and
- a first adsorption unit for separating and recovering hydrogen from the coke oven gas (COG) by contacting the hydrogen-enriched gas stream with a first adsorbent,
- wherein the gas stream discharged from the first adsorption unit has a circulation structure supplied to a front end of the compressor.
A method for separating and recovering hydrogen from coke oven gas (COG) in steel industry at a concentration of 99.9 volume % or more with a recovery rate of 95% or more, comprising the following steps:
- a step of preprocessing to remove impurities including tar, moisture, oil, hydrogen sulfide and dust from coke oven gas (COG) containing hydrogen, methane, carbon monoxide, carbon dioxide, nitrogen, light hydrocarbons and impurities comprising tar, moisture, oil, hydrogen sulfide and dust;
- a step of membrane separation to produce a hydrogen-enriched gas stream at a concentration of at least 95 volume % by recovering hydrogen from the coke oven gas (COG) with a recovery rate of 90% or more through membrane separation of the coke oven gas (COG) treated in the preprocessing unit in the membrane separation unit comprising a plurality of separation membrane packages in which at least two separation membrane packages that selectively permeate hydrogen are connected in series, and a single compressor connected to the plurality of separation membrane packages;
- and
- a step of first adsorption to separate and recover hydrogen from the coke oven gas (COG) by contacting the hydrogen-enriched gas stream with a first adsorbent,
- wherein the gas stream discharged from the step of first adsorption has a circulation structure supplied to a front end of the compressor.
A method for concentrating hydrogen from coke oven gas (COG) in steel industry that separates and recovers hydrogen at a concentration of 99.9 volume % or more with a recovery rate of 95% or more, comprising the following steps:
- a step of preprocessing to remove impurities including tar, moisture, oil, hydrogen sulfide and dust from coke oven gas (COG) containing hydrogen, methane, carbon monoxide, carbon dioxide, nitrogen, light hydrocarbons and impurities comprising tar, moisture, oil, hydrogen sulfide and dust;
- a step of membrane separation to produce a hydrogen-enriched gas stream at a concentration of at least 95 volume % by recovering hydrogen from the coke oven gas (COG) with a recovery rate of 90% or more through membrane separation of the coke oven gas (COG) treated in the preprocessing unit in the membrane separation unit comprising a plurality of separation membrane packages in which at least two separation membrane packages that selectively permeate hydrogen are connected in series, and a single compressor connected to the plurality of separation membrane packages;
- and
- a step of first adsorption to separate and recover hydrogen from the coke oven gas (COG) by contacting the hydrogen-enriched gas stream with a first adsorbent,
- wherein the gas stream discharged from the step of first adsorption has a circulation structure supplied to a front end of the compressor.
Dependencies are inferred from the claim text.