Method for preparing methyl alcohol synthesis gas and compressed natural gas from coke oven gas and coal

Abstract

The invention discloses a method for producing methanol synthesis gas and compressed natural gas by taking coke oven gas and coal as raw materials, and the main steps comprise that purification treatment, transformation treatment, desulfurizing decarburization, pressure swing absorption separation of methane and hydrogen and methane-rich gas compression are carried out to the coke oven gas to prepare the compressed natural gas; and coal gasification reaction, purification treatment, mixing with the hydrogen and fine desulfurization treatment are carried out to the coal to obtain the methanol synthesis gas. The method is based on the characteristics of more hydrogen and less carbon in the coke oven gas and more carbon and less hydrogen in the coal-made methanol feed gas, transforms CO to H2 and CO2 by the transformation treatment after the effective pretreatment to the coke oven gas, and then the H2 and CH4 are separated effectively by a PSA technology so as to be used as the raw materials with higher values, and therefore the method achieves the purpose of comprehensively utilizing the coke oven gas and the coal as the raw materials for producing the methanol synthesis gas and the compressed natural gas, adopts the effective energy in the coke oven gas and the coal to maximum, saves energy, reduces emission and improves the economic benefits.

Description

technical field

[0001] The invention belongs to the technical field of comprehensive application of coke oven gas and coal, in particular to a method for producing methanol synthesis gas and compressed natural gas by using coke oven gas and coal as raw materials. Background technique

[0002] Coke oven gas is a by-product of coke production. The annual production capacity of coke in my country is more than 300 million tons, and the by-product coke oven gas is not only used for coking, civil and commercial fuel, and power generation, but also releases more than 20 billion m of coke oven gas every year 3 . In recent years, coke oven gas has been used more and more widely, for example, after rough purification, it can be used as raw material gas for power generation in power plants, or into urban fuel pipeline network as city gas, or after deep purification, it can be used for methanol synthesis gas by pure oxygen conversion method.

[0003] The composition of coke oven gas i...

Examples

Embodiment 1

[0061] In this embodiment, the method for producing methanol synthesis gas and compressed natural gas by using coke oven gas and coal as raw materials includes the following main steps: coke oven gas undergoes purification treatment, conversion treatment, desulfurization and decarbonization, separation of methane and hydrogen by pressure swing adsorption, and methane-enriched gas Pressurized into compressed natural gas, coal gasification reaction and purification treatment, mixed with hydrogen, fine desulfurization treatment to obtain methanol synthesis gas. Its flowchart is as follows: figure 1 As shown, the specific processing methods of each step are as follows:

[0062] (1), pretreatment of coke oven gas (ie figure 1 coke oven gas pretreatment in

[0063] Using the dry purification temperature swing adsorption method, the raw coke oven gas is subjected to three-stage treatment of rough removal, fine removal, and oil removal to remove most of naphthalene, special sulfur, ...

Embodiment 2

[0097] In this embodiment, the method for producing methanol synthesis gas and compressed natural gas by using coke oven gas and coal as raw materials includes the following main steps: coke oven gas undergoes purification treatment, conversion treatment, desulfurization and decarbonization, separation of methane and hydrogen by pressure swing adsorption, and methane-enriched gas Pressurized into compressed natural gas, coal gasification reaction and purification treatment, mixed with hydrogen, fine desulfurization treatment to obtain methanol synthesis gas. Its flowchart is as follows: figure 1 As shown, the specific processing methods of each step are as follows:

[0098] (1) Pretreatment of coke oven gas

[0099] Using the dry purification temperature swing adsorption method, the raw coke oven gas is subjected to three-stage treatment of rough removal, fine removal, and oil removal to remove most of naphthalene, special sulfur, benzene, HCN, ammonia, and oil to obtain puri...

technical field

[0001] The invention belongs to the technical field of comprehensive application of coke oven gas and coal, in particular to a method for producing methanol synthesis gas and compressed natural gas by using coke oven gas and coal as raw materials. Background technique

[0002] Coke oven gas is a by-product of coke production. The annual production capacity of coke in my country is more than 300 million tons, and the by-product coke oven gas is not only used for coking, civil and commercial fuel, and power generation, but also releases more than 20 billion m of coke oven gas every year 3 . In recent years, coke oven gas has been used more and more widely, for example, after rough purification, it can be used as raw material gas for power generation in power plants, or into urban fuel pipeline network as city gas, or after deep purification, it can be used for methanol synthesis gas by pure oxygen conversion method.

[0003] The composition of coke oven gas i...

Examples

Embodiment 1

[0061] In this embodiment, the method for producing methanol synthesis gas and compressed natural gas by using coke oven gas and coal as raw materials includes the following main steps: coke oven gas undergoes purification treatment, conversion treatment, desulfurization and decarbonization, separation of methane and hydrogen by pressure swing adsorption, and methane-enriched gas Pressurized into compressed natural gas, coal gasification reaction and purification treatment, mixed with hydrogen, fine desulfurization treatment to obtain methanol synthesis gas. Its flowchart is as follows: figure 1 As shown, the specific processing methods of each step are as follows:

[0062] (1), pretreatment of coke oven gas (ie figure 1 coke oven gas pretreatment in

[0063] Using the dry purification temperature swing adsorption method, the raw coke oven gas is subjected to three-stage treatment of rough removal, fine removal, and oil removal to remove most of naphthalene, special sulfur, ...

Embodiment 2

[0097] In this embodiment, the method for producing methanol synthesis gas and compressed natural gas by using coke oven gas and coal as raw materials includes the following main steps: coke oven gas undergoes purification treatment, conversion treatment, desulfurization and decarbonization, separation of methane and hydrogen by pressure swing adsorption, and methane-enriched gas Pressurized into compressed natural gas, coal gasification reaction and purification treatment, mixed with hydrogen, fine desulfurization treatment to obtain methanol synthesis gas. Its flowchart is as follows: figure 1 As shown, the specific processing methods of each step are as follows:

[0098] (1) Pretreatment of coke oven gas

[0099] Using the dry purification temperature swing adsorption method, the raw coke oven gas is subjected to three-stage treatment of rough removal, fine removal, and oil removal to remove most of naphthalene, special sulfur, benzene, HCN, ammonia, and oil to obtain puri...

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