Technique and method for achieving power generation by means of explosion of extremely-low-concentration gas

Abstract

The invention relates to a technique and method for achieving power generation by means of the explosion of extremely-low-concentration gas. According to the method, in order to fully utilize gas with the concentration being lower than the 5% lower explosive limit and particularly mine return air gas with the concentration being lower than 0.75%, combustible and explosive gas or liquid with the optimal volume concentration is sprayed into the gas, and the combustible and explosive gas or liquid with the optimal volume concentration is relatively cheap and easy to store and transport; in addition, the combustible and explosive gas or liquid has a low lower explosive limit and can be ignited to explode after being mixed with the extremely-low-concentration gas, then acting is achieved for generating mechanical energy, a piston drives a crankshaft connecting rod to be connected with a power generator so that the mechanical energy can be converted into electric energy, and waste heat is recycled. The technique comprises a gas delivering and drying system, a liquid atomization system, a gas distribution system, a cooling system, a waste heat utilization system, a heat engine system and a power generation system. According to the technique and method for achieving power generation by means of the explosion of the extremely-low-concentration gas, the gas with the concentration being lower than 5% can be fully utilized, the energy conversion efficiency is improved, and greenhouse gas emission is reduced; and a novel energy-saving and emission-reducing power generation method is provided.

Description

technical field [0001] The invention relates to the fields of energy technology and energy saving and emission reduction, in particular to a technology and method for generating electricity by explosion of a mixture of gas with a concentration of less than 5% combined with combustible liquid or gas. Background technique [0002] Gas is the main harmful gas and dangerous source in coal mines, and its main component is methane. In 2010, about 28 million tons of methane was emitted into the atmosphere due to coal mining worldwide, of which about 80% came from mine return air with a concentration of less than 1%. On the one hand, methane is a clean and efficient energy source; on the other hand, the impact of a unit mass of methane on the atmospheric greenhouse effect is 21 times that of carbon dioxide, which is a serious greenhouse gas. Therefore, reasonable recovery and utilization of low-concentration gas, especially the gas in the mine return air, has dual meanings of savin...

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Problems solved by technology

[0004] The utilization of low-concentration gas is mainly in the following aspects: purification and separation, that is, pressure-swing temperature-swing adsorption. Although it reduces the greenhouse effect to a certain extent, it is not suitable for the gas whose concentration is too low to be ignited, and wastes energy; the oxidation technology mixes the low-concentration gas pumped out with the coal mine exhaust gas gas, and an oxidation reaction occurs Then use the generated heat energy for power generation, refrigeration and heating, and carry out the step utilization of heat

This technology is feasible, but it is still unable to make full use of a large amount of wind exhaust gas; low-concentration gas power generation technology, there are three main methods: gas turbine power generation, steam turbine power generation and reciprocating piston internal combustion unit power generation

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