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Method and device for synthesizing natural gas by using coke oven gas

A technology for synthesizing natural gas and coke oven gas, which is applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of underutilization of hydrogen, underutilization of hydrogen, underutilization of precious resource hydrogen, etc. Industrial application value, the effect of enhancing the service life

Inactive Publication Date: 2008-01-09
张文慧 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Efforts have been made in some patents for the more efficient application of coke oven gas. CN1919985A discloses a method for producing synthetic natural gas from coke oven gas, using methanation reaction to convert CO, CO 2 and H 2 The reaction produces CH 4 , and then purify CH with PSA 4 Synthetic natural gas is obtained, but this method makes the hydrogen in the coke oven gas underutilized, and the carbon monoxide and carbon dioxide in the coke oven gas can only consume about half of the hydrogen
CN1952082A, CN1935956A, CN1952083A and CN1952084A adopt mixed cold separation and PSA purification to produce methane, and the precious resource hydrogen in the coke oven gas is not utilized at all
US4318997 discloses a method for synthesizing natural gas from coke oven gas by using multi-stage fluidized bed catalytic methanation, and the hydrogen in the coke oven gas has not been fully utilized

Method used

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  • Method and device for synthesizing natural gas by using coke oven gas

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Embodiment 1

[0036] As shown in Figure 1, the coke oven gas is compressed to 3.0 MPa after conventional purification, de-tarring, desulfurization, de-ammonia, de-benzene and de-naphthalene, and the composition is (vol%) H 2 60%, CH 4 25%, CO6%, CmHn3%, CO 2 2%, N 2 4%, O 2 0.5%, and then enter the low-temperature methanol elution device for fine desulfurization, and the purified gas is supplemented with the waste CO discharged from the urea device 2 Then enter the first stage of methanation reactor, CO 2 The supplemental amount is 5% of the coke oven gas, the reaction temperature is 250~500℃, the catalyst is nickel / alumina, and the reacted gas is supplemented with 10% CO 2 Then it enters the boiler to produce steam. After cooling, it enters the second stage methanation reactor. The reaction temperature is 250~500℃. The catalyst is nickel / alumina. The hydrogen content in the outlet mixture of the second stage reactor is 10%~20%. The product flows into the boiler to produce steam. After cooling ...

Embodiment 2

[0038] As shown in Figure 2, the coke oven gas is conventionally purified to remove tar, desulfurization, ammonia, benzene, and naphthalene, and then compressed to 1.0MPa, and the composition is (vol%) H 2 60%, CH 4 25%, CO6%, CmHn 3%, CO 2 2%, N 2 4%, O 2 0.5%, and then heat up to 150℃, after entering the conversion absorption fine desulfurization reactor, it is equipped with absorption conversion desulfurizer, the carrier is manganese ore, the active tissue is Co, Mo and Zn, and the gas after fine desulfurization enters the isothermal bed for methanation The first stage reactor, the reaction temperature is 300°C, the methanation catalyst is nickel / diatomaceous earth, after the reaction, the gas boiler is cooled and the blast furnace gas is added and then enters, and then enters the second stage reactor of methanation. The composition CO of the blast furnace gas is 30%. CO 2 18%, H 2 1.5%, N 2 29.2%, O 2The supplemental amount is 5% of the volume of coke oven gas. The high-temper...

Embodiment 3

[0040] As shown in Figure 3, the coke oven gas is conventionally purified to remove tar, desulfurization, deammonia, debenzene and denaphthalene, and then compressed to 4.0MPa, then heat exchanged and heated to 400°C, after entering the conversion and absorption fine desulfurization reactor, Built-in absorption conversion desulfurizer, the carrier is diatomaceous earth, the active components are Ni, Cu, and Zn, the gas after fine desulfurization enters the first stage of methanation reactor, the reaction temperature is 250-500℃, the catalyst is nickel / ceramic, and the reaction produces After the high temperature gas enters the boiler to produce steam, the temperature is reduced and the converter gas is added, and then it enters the second-stage methanation reactor. The composition of the converter gas is CO 60%, CO 2 16%, the supplemental amount is 20% of the coke oven gas. The high-temperature gas exiting the second-stage methanation reactor enters the boiler to produce steam and...

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Abstract

A method for synthesizing and producing natural gas by hydrogen of coal gas and its synthesizer are disclosed. The process is carried out by purifying tar, crude removing sulfur, ammonia, benzene and naphthalene, compressing to 0.5-5.0 MPa, removing sulfur impurities, supplementing carbon 5-20 wt%, and methanation reacting to obtain final product. It saves energy resources and has no environmental pollution.

Description

Technical field [0001] The invention relates to a method for preparing synthetic natural gas by fully utilizing hydrogen resources in coke oven gas, in particular to a device for realizing the method, and belongs to the technical field of synthetic natural gas. Background technique [0002] my country currently produces 200 million tons of coke per year, and the effluent coke oven gas is 40 billion Nm 3 / Year, the composition of coke oven gas is: H 2 58~66%, CH 4 21~25%, CO 5~8%, CmHn 1.6~2.0%, CO 2 1.9~2.3%, N 2 2~6%, O 2 0.3% to 0.7%, and contains impurities such as sulfide, benzene, naphthalene, and sulfide contains hydrogen sulfide, carbonyl sulfide, carbon disulfide, and thiophene, etc. When coke oven gas is used for chemical production, the above impurities must be removed, otherwise it will easily cause catalyst loss Live and equipment are blocked. At present, coke oven gas is mainly used for power generation, and part of it is used to produce methanol, dimethyl ether, hyd...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 张文慧周红军
Owner 张文慧
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