Method for synchronous implementation of methanation of coke oven gas and in-situ purification of marsh gas

A technology of gas methane and coke oven gas, which is applied in the field of synchronous coke oven gas methanation and biogas in-situ purification, can solve the problems of incomplete utilization and high investment and operation costs, and achieve the effect of reducing emissions

Inactive Publication Date: 2013-05-22
TONGJI UNIV
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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 high temperature, high pressure and the presence of catalysts. In addition, H in the 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 synchronous implementation of methanation of coke oven gas and in-situ purification of marsh gas

Examples

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Effect test

Embodiment 1

[0030] 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

[0032] A method for synchronously realizing methanation of coke oven gas and in-situ purification of biogas, the process of which is as follows figure 1As shown, the method includes the following steps:

[0033] (a) coke oven gas 1 is passed in the anaerobic reactor 3 of processing organic waste 2;

[0034] (b) In anaerobic reactor 3, organic waste 2 is degraded by microorganisms to produce CH 4 and CO 2 , producing CO 2 Further with 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%;

[0035] (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%).

[0036] Wherein, the flow rate of the coke oven gas 1 that passes into the anaerobic reactor 3 in the step (a) is determined by the following ...

Embodiment 3

[0041] A method for synchronously realizing methanation of coke oven gas and in-situ purification of biogas, the process of which is as follows figure 1 As shown, the method includes the following steps:

[0042] (a) coke oven gas 1 is passed in the anaerobic reactor 3 of processing organic waste 2;

[0043] (b) In anaerobic reactor 3, organic waste 2 is degraded by microorganisms to produce CH 4 and CO 2 , producing CO 2 Further with 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%;

[0044] (c) Obtain natural gas 5 with high methane content (methane content above 98%) by cryogenically separating impurities in biogas 4 mainly composed of CH4.

[0045] Wherein, the flow rate of the coke oven gas 1 that passes into the anaerobic reactor 3 in the step (a) is determined by the following meth...

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Abstract

The invention relates to a method for synchronous implementation of methanation of coke oven gas and in-situ purification of marsh gas. The method comprises the following steps: (a) introducing the coke oven gas and organic wastes into an anaerobic reactor; (b) in the anaerobic reactor, degrading the organic wastes with microbes to generate CH4 and CO2, enabling produced CO2 to combine with H2 in the coke oven gas to generate CH4 under the action of the microbes, and reacting CO and CO2 in the coke oven gas with H2 to generate CH4 to get the marsh gas which mainly contains CH4; and (c) separating and removing impurities in the marsh gas obtained in the step (b) to get natural gas with high content of methane. Compared with the prior art, according to the method disclosed by the invention, a microbial process is adopted for introducing the coke oven gas into the anaerobic reactor, the in-situ purification of the marsh gas is simultaneously implemented during the preparation of the natural gas, a catalyst is not required, high temperature and high pressure are not required, and most of components except methane in the coke oven gas and the marsh gas can be converted to methane, so that the new method is provided for solving the problems of shortage of resources, environmental pollution, unreasonable energy structure and the like in the energy field in China.

Description

technical field [0001] The invention relates to comprehensive utilization of coking industrial by-products and biogas purification, in particular to a method for synchronously realizing methanation of coke oven gas and in-situ purification of biogas. Background technique [0002] Due to the advantages of high load, low energy consumption, low operating cost, and energy generation, the anaerobic digestion process is widely used in high-concentration organic wastewater (distiller's grains, landfill leachate, etc.), organic waste (sludge, cow dung, straw, etc.) processing. The main component of the biogas produced by the anaerobic digestion process is 50-70% methane (CH 4 ), 30-50% carbon dioxide (CO 2 ) and a small amount of hydrogen sulfide (H 2 S), water (H 2 O), ammonia nitrogen (NH 3 ), hydrogen (H 2 ) and carbon monoxide (CO), etc., are a sustainable and valuable source of energy. Untreated ordinary biogas has low energy density and generally has a calorific value ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C07C9/04C07C1/04C07C1/12C10L3/10
CPCY02E50/343Y02E50/30
Inventor 谢丽王雯罗刚周琪
Owner TONGJI UNIV
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