Technology for producing hydrogen from coke oven gas through deep deoxygenation and dehydration

A coke oven gas and process technology, which is applied in hydrogen separation, specific gas purification/separation, hydrogen separation through selective and reversible absorption, etc., can solve the problems of waste of energy, complicated equipment, and high energy consumption of thermal regeneration

Active Publication Date: 2017-05-24
杨皓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 3. Especially when the oxygen content in pure hydrogen is required to be as low as <1ppm, the recovery rate of purely using one-stage pressure swing adsorption to extract hydrogen is even lower
Dehydration heat regeneration requires high energy consumption, the regeneration gas need

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: A 300NM3 / H coke oven gas extraction 18MPa high-purity hydrogen 99.99% concentration device. After the coke oven gas removes hydrogen sulfide and heavy hydrocarbons, it enters the first-stage pressure swing adsorption device at a pressure of 0.05MPa to remove carbon dioxide, methane, and C2+ , organic sulfur, to obtain 93% concentration of hydrogen-rich gas, the yield of hydrogen is 98%, and the hydrogen-rich gas contains more non-hydrogen gases such as carbon monoxide, nitrogen, and oxygen. The hydrogen-rich gas is compressed to 1.8MPa, the gas temperature at the outlet of the compressor is 95°C, and it directly enters the catalytic deoxygenation reaction tower, and the oxygen content at the outlet of the reaction tower is less than 0.1ppm. Cool the deoxygenated gas to 35°C and enter the second-stage pressure swing adsorption device. The concentration of pure hydrogen at the outlet is 99.99%, the oxygen content in hydrogen is less than 0.12ppm, and the water c...

Embodiment 2

[0008] Example 2: A 22000NM3 / H coke oven gas extracts 0.8MPa high-purity hydrogen 99.99% concentration device. After the coke oven gas removes hydrogen sulfide and heavy hydrocarbons, it enters the first-stage pressure swing adsorption device at a pressure of 0.15MPa to remove carbon dioxide, methane, C2+, organic sulfur, 95% concentration of hydrogen-rich gas is obtained, and the yield of hydrogen is 97.6%. The hydrogen-rich gas contains more non-hydrogen gases such as carbon monoxide, nitrogen, and oxygen. The hydrogen-rich gas is compressed to 0.83MPa, the gas temperature at the outlet of the compressor is 105°C, and it directly enters the catalytic deoxygenation reaction tower, and the oxygen content at the outlet of the reaction tower is less than 0.1ppm. Cool the deoxygenated gas to 35°C and enter the second-stage pressure swing adsorption device. The concentration of pure hydrogen at the outlet is 99.99%, the oxygen content in the hydrogen is less than 0.12ppm, and the w...

Embodiment 3

[0009] Example 3: A certain 2000NM3 / H coke oven gas extracts 1.8MPa high-purity hydrogen 99.999% concentration device. After the coke oven gas removes hydrogen sulfide and heavy hydrocarbons, it enters the first-stage pressure swing adsorption device at a pressure of 0.3MPa to remove carbon dioxide, methane, C2+, organic sulfur, 96% concentration of hydrogen-rich gas is obtained, and the yield of hydrogen is 97.2%. The hydrogen-rich gas contains more non-hydrogen gases such as carbon monoxide, nitrogen, and oxygen. The hydrogen-rich gas is compressed to 1.83MPa, the gas temperature at the outlet of the compressor is 115°C, and it directly enters the catalytic deoxygenation reaction tower, and the oxygen content at the outlet of the reaction tower is less than 0.1ppm. Cool the deoxygenated gas to 35°C and enter the second-stage pressure swing adsorption device. The concentration of pure hydrogen at the outlet is 99.999%, the oxygen content in hydrogen is less than 0.12ppm, and t...

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PUM

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Abstract

The invention relates to a technology for producing hydrogen from coke oven gas. The feed gas contains 45-55% of hydrogen. The technology comprises the following steps: removing most of carbon dioxide, C<2+> and methane through first-stage pressure swing adsorption so that the concentration of hydrogen-rich gas is 93-96% and the hydrogen yield is greater than 97%; compressing the hydrogen-rich gas to 0.8-2.8MPa, wherein the compressed exit gas is not cooled (interstage cooling is needed); at 80-110 DEG C, catalyzing oxygen in a deoxygenation tower and generating carbon dioxide with carbon monoxide or catalyzing oxygen and generating water with hydrogen; removing oxygen to below 1ppm and cooling the deoxygenated gas to below 40 DEG C; removing non-hydrogen gas through second-stage pressure swing adsorption; and purifying the hydrogen to 99-99.99999% as required.

Description

technical field [0001] The invention relates to the fields of chemical industry and environmental protection, and is a method for effectively reducing production energy consumption and raw material consumption. Background technique [0002] 1. The hydrogen content of coke oven gas is 45%~55%. To purify hydrogen, the usual practice is to pre-purify heavy hydrocarbons and hydrogen sulfide in coke oven gas, and then compress it to the required hydrogen pressure. Combined adsorbent is used for pressure swing adsorption once. It can effectively increase the concentration of hydrogen to the required concentration of 99%~99.99999%. [0003] 2. Under 1.8MPa, it is difficult to obtain 99.99% hydrogen concentration and 80% hydrogen yield, and it is difficult to obtain 99.9% hydrogen concentration and 90% hydrogen yield. [0004] 3. Especially when the oxygen content in pure hydrogen is required to be as low as <1ppm, the recovery rate of purely using one-stage pressure swing adsor...

Claims

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Application Information

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IPC IPC(8): C01B3/50
CPCC01B3/508C01B2210/0045C01B2210/0046C01B2210/005C01B2210/0051C01B2210/0068C01B2210/007C01P2006/80
Inventor 杨皓宁平钟俊波
Owner 杨皓
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