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Method for decarburizing coke oven gas

A coke oven gas and decarbonization technology, which is applied in the direction of gas fuel, selection of absorbent solid gas purification, petroleum industry, etc., can solve problems such as high operating temperature, reduce total concentration, increase product cost, etc., and achieve simple process flow , the effect of low energy consumption

Active Publication Date: 2013-01-30
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2011, the by-product coke oven gas in China was about 170 billion Nm 3 , about 80 billion Nm except partly used for heating the coke oven itself 3 failed to use effectively
But this method CO+CO in the coke oven gas 2 There is a requirement for the total concentration of the coke oven gas, which must be below 4%. Otherwise, part of the mixed gas after the reaction needs to be refluxed to reduce the CO+CO in the coke oven gas. 2 The total concentration; secondly, the operating temperature of this method is 250 ℃ ~ 550 ℃, and the operating temperature is relatively high; thirdly, this method needs to consume Ni catalyst, which increases the product cost

Method used

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  • Method for decarburizing coke oven gas

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Embodiment 1

[0026] The method of present embodiment coke oven gas decarburization is as follows:

[0027] After the coke oven gas is purified to remove impurities such as benzene, naphthalene, heavy hydrocarbons, and sulfides, the composition of the purified gas obtained is (V%): H 2 : 56.5%, CH 4 : 25.1%, N 2 : 7.9%, CO: 4.5%, CO 2 : 4.0%, C 2 h 4 : 1%, C 2 h 6 :1%. The purified gas is passed through a pressure swing adsorption decarburization device filled with a solid mixed adsorbent. The solid mixed adsorbent is composed of a silica gel with a content of 50% and a copper adsorbent with a content of 50%. CO, CO 2 and C 2 + Adsorbed as a strong adsorption component and retained in the adsorption tower, N 2 、CH 4 and H 2 As a weakly adsorbed component, it flows out of the adsorption tower, which is decarbonized gas. The pressure swing adsorption decarburization device completes an adsorption regeneration cycle through adsorption, pressure equalization drop, reverse discharg...

Embodiment 2

[0031] The method of present embodiment coke oven gas decarburization is as follows:

[0032] After the coke oven gas is purified to remove impurities such as benzene, naphthalene, heavy hydrocarbons, and sulfides, the composition of the purified gas obtained is (V%): H 2 : 56.4%, CH 4 : 25.0%, N 2 : 7.9%, CO: 4.5%, CO 2 : 4.0%, C 2 h 4 : 1%, C 2 h 6 : 1%, H 2 O: 0.2%. The purified gas is passed through a pressure swing adsorption decarburization device filled with a solid mixed adsorbent. The solid mixed adsorbent in the device is, in terms of mass percentage, composed of silica gel with a content of 60%, copper adsorbent with a content of 30% and Composed of 10% alumina, CO, CO 2 and C 2 + Adsorbed as a strong adsorption component and retained in the adsorption tower, N 2 、CH 4 and H 2 As a weakly adsorbed component, it flows out of the adsorption tower, which is decarbonized gas. The pressure swing adsorption decarburization device completes an adsorption reg...

Embodiment 3

[0036] After the coke oven gas is purified to remove impurities such as benzene, naphthalene, heavy hydrocarbons, and sulfides, the composition of the purified gas obtained is (V%): H 2 : 56.5%, CH 4 : 25.1%, N 2 : 7.9%, CO: 4.5%, CO 2 : 4.0%, C 2 h 4 : 1%, C 2 h 6 :1%. The purified gas is passed through a pressure swing adsorption decarburization device filled with a solid mixed adsorbent. The solid mixed adsorbent in the pressure swing adsorption decarburization device, in terms of mass percentage, includes 45% silica gel with a content of 45% % copper adsorbent and 10% activated carbon, CO, CO 2 and C 2 + Adsorbed as a strong adsorption component and retained in the adsorption tower, N 2 、CH 4 and H 2 As a weakly adsorbed component, it flows out of the adsorption tower, which is decarbonized gas. The pressure swing adsorption decarburization device completes an adsorption regeneration cycle through adsorption, pressure equalization drop, reverse discharge, evac...

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Abstract

The invention relates to a method for decarburizing coke oven gas, which is implemented in a way that: purified coke oven gas passes through a pressure swing adsorption decarburizing device filled with a solid adsorbent mixture, wherein CO, CO2 and C<2+> are adsorbed as strong adsorption components and stay in the adsorption tower, and N2, CH4 and H2 flow out of the adsorption tower as weak adsorption components which are decarburized gas. The solid adsorbent mixture comprises 20-80% of silica gel, 20-80% of copper adsorbent, 0-30% of aluminum oxide, 0-30% of activated carbon, 0-30% of 5A molecular sieve and 0-30% of 13X molecular sieve, totaling 100%. The method provided by the invention only uses pressure swing adsorption technology, does not need to limit the total concentration of CO+CO2 in the coke oven gas, can be operated at normal temperature, and has the advantages of simple technical process, low energy consumption and the like.

Description

technical field [0001] The invention relates to the field of decarbonization of coke oven gas, in particular to adopting a decarburization device to remove CO and CO in coke oven gas 2 and C 2 + Methods. [0002] Background technique [0003] Coke oven gas is a by-product gas in the coking process, and its main components include: in terms of volume percentage, CH 4 : 22~27%; N 2 : 5~8%; CO: 4~6%; CO 2 : 3~5%; C 2 + : 1~3%; the balance is H 2 . In 2011, the by-product coke oven gas in China was about 170 billion Nm 3 , about 80 billion Nm except partly used for heating the coke oven itself 3 not used effectively. If the methane in the coke oven gas is separated and purified, it can be used to produce natural gas, compressed natural gas, liquefied natural gas, etc., which can not only solve environmental problems, but also have good economic benefits. [0004] When separating and purifying methane in coke oven gas, the difficulty lies in how to remove CO and CO i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/32C10L3/08
Inventor 李旭张剑锋王键杨云管英富宁勇建姚中华刘照利
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND