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Method for extracting high purity hydrogen from coke oven gas reformed gas

A technology of coke oven gas and reformed gas, applied in the direction of hydrogen separation, etc., can solve the problems of low selectivity of hydrogen permeation, waste of resources, environment, fluctuation of product hydrogen purity, etc., and achieve the effect of large hydrogen permeation

Inactive Publication Date: 2014-12-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Coke oven gas is a by-product of the coking process, and it is an excellent raw material for hydrogen production. my country's coke oven gas resources are abundant, but the actual utilization level is very low, and most of them are directly burned as industrial or civil fuel, resulting in serious waste of resources and environmental pollution.
[0004] The separation and purification technologies of coke oven gas mainly include pressure swing adsorption method, cryogenic separation method and ordinary membrane separation method. Pressure swing adsorption method can produce high-purity hydrogen, but it has the disadvantages of large equipment investment, low recovery rate and fluctuation of product hydrogen purity. and other disadvantages; while the hydrogen purity obtained by the cryogenic separation method is not high, and the equipment is complicated and the investment is large; the hydrogen permeation selectivity of the ordinary membrane separation method is small, usually only tens or hundreds, so that the purity of the recovered hydrogen is not high, and generally can only be improved. 1 to 2 orders of magnitude, and there are also disadvantages such as small processing capacity per unit membrane area

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  • Method for extracting high purity hydrogen from coke oven gas reformed gas
  • Method for extracting high purity hydrogen from coke oven gas reformed gas
  • Method for extracting high purity hydrogen from coke oven gas reformed gas

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Effect test

Embodiment 1

[0024] Using coke oven gas reformed gas with a hydrogen content of 76.71% (see Table 1) as the raw material gas, a metal-palladium composite membrane hydrogen purifier is used for hydrogen purification. Such as figure 1 As shown, the coke oven gas reformed gas enters the buffer tank 1 at 0.1 MPa, the pressure is raised to 0.48 MPa by the hydrogen compressor 2, and enters the electric heater 4 through the filter 3 to be heated to 415°C and enters the metal palladium composite membrane for hydrogen purification Device 5, for hydrogen purification, the permeated hydrogen pressure is 0.11MPa, no impurities can be detected online by the gas chromatography TCD detector, and the CO content is less than 1.0ppm, CO 2 The content is 4.0ppm, indicating that the purity of permeated hydrogen is greater than 99.999%. The hydrogen recovery rate is 90.4%, and the permeated hydrogen flow rate is 98.8m 3 / h. The composition of feed gas and permeated hydrogen is shown in the table below:

[...

Embodiment 2

[0028] The coke oven gas reformed gas containing 76.15% hydrogen (see Table 2) is used as the raw material gas, and the hydrogen is purified by a metal-palladium composite membrane hydrogen purifier. Such as figure 1 As shown, the coke oven gas reformed gas enters the buffer tank 1 at 0.1MPa, the pressure is increased to 0.66MPa through the hydrogen compressor 2, and enters the electric heater 4 through the filter 3, and is heated to 410°C and enters the metal palladium composite membrane for hydrogen purification Device 5, for hydrogen purification, the permeated hydrogen pressure is 0.11MPa, no impurities can be detected online by the gas chromatography TCD detector, and the CO content is less than 1.0ppm, CO 2 The content is 4.2ppm, indicating that the purity of permeated hydrogen is greater than 99.999%. The hydrogen recovery rate is 93.1%, and the permeated hydrogen flow rate is 112.3m 3 / h. The composition of feed gas and permeated hydrogen is shown in the table below...

Embodiment 3

[0032] Coke oven gas reformed gas containing 78.2% hydrogen (see Table 3) is used as raw material gas, such as figure 1 As shown, the coke oven gas reformed gas enters the buffer tank 1 at 0.1 MPa, increases the pressure to 0.88 MPa through the hydrogen compressor 2, enters the electric heater 4 through the filter 3, and is heated to 405°C to enter the metal palladium composite membrane for hydrogen purification Device 5, for hydrogen purification, the permeated hydrogen pressure is 0.11MPa, no impurities can be detected online by the gas chromatograph TCD detector, and the CO content is less than 1.0ppm and the CO2 content is 4.5ppm detected offline by the gas chromatograph FID detector, indicating the purity of the permeated hydrogen Greater than 99.999%. The hydrogen recovery rate is 95.2%, and the permeated hydrogen flow rate is 125.1m 3 / h. The composition of feed gas and permeated hydrogen is shown in the table below:

[0033] Table 3 Hydrogen purification results of ...

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Abstract

The invention provides a method for extracting high purity hydrogen from coke oven gas reformed gas; an ultra-highly hydrogen-permeation-selective metal palladium composite membrane hydrogen purification device is used, the high purity hydrogen is obtained from the coke oven gas reformed gas under the conditions guaranteeing high hydrogen recovery rate. The coke oven gas reformed gas first enters a buffer tank, then enters a compressor for pressure rise, then successively passes through a filter and an electric heater to enter into the metal palladium composite membrane hydrogen purification device, and is cooled by a cooler to obtain the high purity hydrogen with the purity greater than 99.999%, the CO content is less than 1.0ppm, and at the same time, because of high hydrogen permeation rate of the metal palladium composite membrane, a higher raw gas treatment amount can be obtained under the conditions of the recovery rate being more than 90%, and full utilization of the coke oven gas can be achieved. The high purity hydrogen extracted by the method can be widely applied in chemical industry, electronics, metallurgy and food industry.

Description

Technical field: [0001] The invention relates to a separation method for purifying hydrogen from reformed gas of coke oven gas. Utilizing the ultra-high hydrogen permeable selectivity of metal palladium composite membrane hydrogen purifier, high hydrogen recovery rate is obtained by direct primary extraction. pure hydrogen. Background technique: [0002] As an important raw material for industrial production, hydrogen is widely used in various fields of the national economy. In recent years, with the progress and development of science and technology and the introduction of foreign advanced technology and equipment, the use of hydrogen has been continuously expanded, and the demand for hydrogen has continued to increase. At the same time, due to the high requirements on technology, equipment and environment for professional hydrogen production, the difficulty of hydrogen production is determined. Using industrial tail gas to develop and produce pure hydrogen and high-purity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50
Inventor 徐恒泳孟繁琼董恩宁李安琪
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI