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A high-efficiency low-concentration gas power generation system and its control method

A low-concentration gas and power generation system technology, applied in the field of high-efficiency and low-concentration gas power generation systems and their control, and power generation systems, can solve problems such as explosions, and achieve the effects of no noise, elimination of hidden dangers of explosion, and high energy conversion rate.

Active Publication Date: 2022-02-08
CHINA UNIV OF MINING & TECH
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  • Claims
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Problems solved by technology

Therefore, how to better adjust the composition of fuel gas in low-concentration gas, reduce its oxygen content, and avoid the phenomenon of explosion when low-concentration gas is applied to SOFC power generation systems has become a technical problem that needs to be solved urgently.

Method used

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  • A high-efficiency low-concentration gas power generation system and its control method

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Embodiment 1

[0030] Embodiment 1: In this embodiment, the concentration of methane in low-concentration gas is about 5%;

[0031] After the low-concentration gas passes through the air electrode of the proton exchange membrane fuel cell, set the output current of the proton exchange membrane fuel cell, control the specific amount of oxygen consumption, and make the utilization rate of oxygen reach about 75%, and the main component of the gas coming out is 4.35 %CH 4 , 65.3% N 2 , 4.35% 0 2 , 26% water vapor, and a small amount of H 2 S, and then condense and remove part of the water vapor in the gas through the condenser, so that the content ratio of water vapor and methane in the mixed gas is about 2.5, so as to realize the reforming of methane, set the condensation temperature of the condenser to 51°C, and condense The composition of the final gas is as follows: 5.13% CH 4 , 76.94% N 2 , 5.13% 0 2 , 12.8% water vapor, and a small amount of H 2 S, the volume content ratio of oxygen...

Embodiment 2

[0038] Embodiment 2: In this embodiment, the methane concentration in the low-concentration gas is about 10%.

[0039] After the low-concentration gas passes through the air electrode of the proton exchange membrane fuel cell, set the output current of the proton exchange membrane fuel cell, control the specific amount of oxygen consumption, and make the utilization rate of oxygen reach about 53%, and the main component of the gas coming out is 9.1 %CH 4 , 64.6%N 2 , 8.1% 0 2 , 18.2% water vapor, and a small amount of H 2 S. At this time, the content ratio of water vapor and methane in the mixed gas is 2, and there is no need to remove water. The temperature of the condenser is set at 58°C, so that the content of water vapor in the mixed gas remains unchanged. At the same time, because the mixed gas also contains part of oxygen, Therefore, there is no need to add water vapor, and it can be directly used as reformed gas. The volume content ratio of oxygen and methane in thi...

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Abstract

The invention discloses a high-efficiency low-concentration gas power generation system and its control method, including a proton exchange membrane fuel cell, a condenser, a desulfurizer, a solid oxide fuel cell, a heat exchanger A, a heat exchanger B and a burner; Concentrated gas passes through the air electrode of the proton exchange membrane fuel cell. At a relatively low operating temperature, the proton exchange membrane fuel cell technology can not only generate electricity, but also supplement hydrogen ions to the air electrode. By adjusting the gas utilization rate of the air electrode, It can consume the oxygen in low-concentration methane gas, thereby eliminating the hidden danger of explosion, and then adjust the temperature of the condenser to condense the water vapor in the gas to provide the proper proportion of water vapor required for fuel reforming, and finally remove it through the desulfurizer After sulfur is used as fuel gas for solid oxide fuel cells to generate electricity, the power generation efficiency is high, the comprehensive efficiency of combined heat and power is high, and low-concentration gas can be effectively used to avoid its discharge into the atmosphere, which is conducive to environmental protection.

Description

technical field [0001] The invention relates to a power generation system, in particular to a high-efficiency low-concentration gas power generation system and a control method thereof, belonging to the technical field of power generation equipment. Background technique [0002] The main component of gas is methane. When the volume ratio of oxygen to methane in the mixed gas is 1.1025-3.99, it will explode when it encounters an open flame. This is the root cause of coal mine gas explosion accidents. If the gas is not utilized and is directly discharged into the atmosphere, its greenhouse effect is about 21 times that of carbon dioxide. Item 5 of Article 148 of the new version of the "Coal Mine Safety Regulations" stipulates that when the concentration of the extracted gas is lower than 30% (lower than the concentration gas), it must not be directly burned as gas; it can be used for internal combustion engine power generation or for other purposes. However, my country's onsh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04007H01M8/04014H01M8/04089H01M8/04298H01M8/10
CPCH01M8/04298H01M8/04067H01M8/04089H01M8/04014H01M8/10Y02E60/50
Inventor 王绍荣曾凡蓉周福宝凌意翰
Owner CHINA UNIV OF MINING & TECH
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