Process for realizing natural gas preparation with coke oven gas by using anaerobic microbes

An anaerobic microorganism, coke oven gas technology, applied in sustainable manufacturing/processing, gas fuel, chemical industry, etc., can solve the problems of high investment and operation cost, low conversion efficiency of alkane gas, etc.

Inactive Publication Date: 2013-05-08
SHANGHAI BAIWOSI WATER TREATMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to overcome the problems that the existing methods need to operate under high temperature, high pressure and catalyst conditions, the efficiency of converting alkanes is low, and the investment and operation costs are high, a process for preparing natural gas from coke oven gas is provided

Method used

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  • Process for realizing natural gas preparation with coke oven gas by using anaerobic microbes

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Embodiment 1

[0023] With 1 volume of coke oven gas (H 2 Content 60%, CO content 8%, CH4 content 25%, CO 2 Content 3%), with 0.06 volume of CO 2 Mixed, passed into the high temperature (55 ℃) CSTR anaerobic reactor, the microorganisms were inoculated with the sludge of the high temperature anaerobic reactor for cow dung, and the highly active anaerobic microorganisms had passed through the H 2 , CO, CO 2 The substrate was pre-acclimated and cultured in a nutrient salt liquid medium containing peptone and dipotassium hydrogen phosphate. The reactor was mechanically stirred at a stirring speed of 400rpm. The residence time of the mixed gas in the reactor is controlled at 1 hour, and every 1.07 volume of the mixed gas can produce about 0.5 volume of the mixed gas, wherein the methane content is about 90%. The resulting mixed gas is further purified through pressure swing adsorption separation to obtain natural gas with a methane content of more than 98%.

Embodiment 2

[0025] With 1 volume of coke oven gas (H 2 Content 60%, CO content 8%, CH4 content 25%, CO 2 Content 3%), with 0.06 volume of CO 2 Mixed, passed into the medium temperature (35 ℃) upflow anaerobic sludge expanded bed reactor (UASB), the microorganisms were inoculated with the medium temperature anaerobic granular sludge, and the highly active anaerobic microorganisms had been passed through the H 2 , CO, CO 2 It was pre-acclimated to the substrate and cultured in nutrient liquid medium containing peptone and dipotassium phosphate. The residence time of the mixed gas in the reactor is controlled at 3 hours, and every 1.07 volume of the mixed gas can produce about 0.45 volume of the mixed gas, wherein the methane content is about 90%. The resulting mixed gas is further purified through cryogenic separation to obtain natural gas with a methane content of more than 98%.

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Abstract

The invention discloses a process for realizing natural gas preparation with coke oven gas by using anaerobic microbes. The process comprises the steps that: a, coke oven gas in a coking furnace and CO2 gas in a CO2 storage tank are mixed, such that mixed gas is obtained; b, the mixed gas is delivered into an anaerobic reactor with high-activity anaerobic microbes; in the anaerobic reactor, CO2, H2 and CO in the original coke oven gas are utilized, and CH4 is produced; H2S in the original coke oven gas is produced into elemental S through sulfur bacteria in the high-activity anaerobic microbes; and c, N2 and other impurities are separated with a pressure-swing adsorption separation device or a cryogenic separation device, such that natural gas with high methane content is obtained. According to the invention, with a microbial process, CO2 is supplemented, and natural gas is prepared. The process is highly economical. With the process, catalyst is not needed, and high-temperature and high-pressure are not needed. Most components except methane in the coke oven gas can be converted into methane, such that CO2 emission is reduced, and effects of energy saving and environment protection are achieved.

Description

technical field [0001] The invention relates to the technical field of coking industrial by-product treatment, in particular to a process for preparing natural gas from coke oven gas by using anaerobic microorganisms. Background technique [0002] Coke oven gas refers to a kind of flammable gas produced while coke and tar products are produced after high-temperature dry distillation in the coke oven by using several kinds of bituminous coal to make coking coal. It 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%, CO 5-8%, C 2 2%-4% above unsaturated hydrocarbons, CO 2 1.5%-3%, O 2 0.3%-0.8%, H 2 S 0.01%, N 2 3%-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 polluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C10L3/10C12P5/02
CPCY02E50/343Y02E50/30Y02P20/10
Inventor 邹中海罗刚谢丽周琪
Owner SHANGHAI BAIWOSI WATER TREATMENT TECH
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