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Method for preparing natural gas by using coke oven gas

A technology for coke oven gas and natural gas, applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of incomplete utilization, high investment and operation cost, and achieve the effect of reducing emissions and contributing to greenhouse gases

Inactive Publication Date: 2016-02-10
石耀威 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Related patents include CN191985A, CN101818087A, CN101591578A, CN101607859A, etc. However, these methods need to be carried out under the conditions of high temperature, high pressure and the presence of a catalyst. In addition, H in coke oven gas 2 and CO 2 The utilization is not complete enough, and the investment and operation costs are relatively high

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  • Method for preparing natural gas by using coke oven gas

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Embodiment 1

[0025] Taking the anaerobic CSTR reactor for treating excess sludge in sewage plant as an example, the reactor is 100m 3 , the biogas production is 1m 3 / L / d, CH in biogas 4 The content is 60%, CO 2 The content is 40%. The composition of coke oven gas is H 2 Content 65%, CO content 5%, CH 4 Content 25%, CO 2 Content 3%. The flow rate of coke oven gas into the anaerobic reactor is 421m 3 / d, the reactor adopts mechanical stirring, and the stirring speed is 400rpm. The volume of mixed gas produced is about 200m 3 / d, the methane concentration is above 90%, and the natural gas with methane content above 98% can be obtained through further purification.

Embodiment 2

[0027] A method for producing natural gas from coke oven gas, the process of which is as follows figure 1 As shown, the method includes the following steps:

[0028] (a) coke oven gas 1 is passed in the anaerobic reactor 3 of processing organic waste 2;

[0029] (b) In anaerobic reactor 3, organic waste 2 is degraded by microorganisms to produce CH 4 and CO 2 , producing CO 2 Further with the H in coke oven gas 1 2 combined to generate CH 4 , a small amount of CO and CO in coke oven gas 1 2 Also utilized by microorganisms with H 2 Generate CH 4 , get CH4-dominated biogas 4, where CH 4 The quality score is 91%;

[0030] (c) Separating impurities in biogas 4 mainly composed of CH4 by pressure swing adsorption to obtain natural gas 5 with high methane content (methane content above 98%).

[0031] Wherein, the flow rate of the coke oven gas 1 that passes into the anaerobic reactor 3 in the step (a) is determined as follows:

[0032] V 焦炉煤气1 =4×V CO2 / (P H2 -3×P CO -...

Embodiment 3

[0036] A method for producing natural gas from coke oven gas, the process of which is as follows figure 1 As shown, the method includes the following steps:

[0037] (a) coke oven gas 1 is passed in the anaerobic reactor 3 of processing organic waste 2;

[0038] (b) In anaerobic reactor 3, organic waste 2 is degraded by microorganisms to produce CH 4 and CO 2, producing CO 2 Further with the H in coke oven gas 1 2 combined to generate CH 4 , a small amount of CO and CO in coke oven gas 1 2 Also utilized by microorganisms with H 2 Generate CH 4 , get CH4-dominated biogas 4, where CH 4 The mass score is greater than 90%;

[0039] (c) Obtain natural gas 5 with high methane content (methane content above 98%) by cryogenically separating impurities in biogas 4 mainly composed of CH4.

[0040] Wherein, the flow rate of the coke oven gas 1 that passes into the anaerobic reactor 3 in the step (a) is determined as follows:

[0041] V 焦炉煤气1 =4×V CO2 / (P H2 -3×P CO -4×P C...

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Abstract

The present invention relates to a method for preparing natural gas by using coke oven gas. The method comprises that: (a) coke oven gas is introduced into an organic waste anaerobic treatment reactor; (b) under the effect of microorganisms in the anaerobic reactor, the organic waste is subjected to anaerobic decomposition to generate biogas adopting CH4 and CO2 as the main components, CO2 and the H2 in the coke oven gas are combined to generate CH4, and the CO and the CO2 in the coke oven gas and H2 generate CH4 so as to finally obtain the biogas adopting CH4 as the main component; and (c) separating and removing impurities in the biogas obtained in the step (b) so as to obtain the high methane content natural gas. Compared with the method in the prior art, the method of the present invention has the following advantages that the coke oven gas is introduced into the anaerobic reactor by using the microorganism to prepare the natural gas, the addition of the catalyst is not required, the high temperature and the high pressure are not required, most of the components in the coke oven gas can be converted into methane, and the new method is provided for solving of the problems of resource shortage, environmental pollution, irrational energy source structure and the like in the energy source field.

Description

technical field [0001] The invention relates to the comprehensive utilization of coking industrial by-products, in particular to a method for preparing natural gas from coke oven gas. Background technique [0002] Coke oven gas refers to a combustible gas produced by coking coal and tar products after high-temperature dry distillation in the coke oven, which is a by-product of the coking industry. Ton of dry coal can produce coke oven gas 300-350m 3 . Its main components are: H 2 55%~60%, CH 4 23%~27%, CO5-8%, C 2 2% to 4% of the above unsaturated hydrocarbons, CO 2 1.5%~3%, O 2 0.3%~0.8%,H 2 S0.01%, N 2 3% to 7%. The use of coke oven gas to synthesize natural gas has opened up a new way of efficient utilization of coke oven gas, which can not only drive the technological progress of coking and energy industries, but also solve the problems of environmental pollution and resource waste caused by coke oven gas emissions. The methods for producing methane from coke o...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 不公告发明人
Owner 石耀威
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