A high-power low-concentration gas engine and its gas supply method

Abstract

The invention provides a high-power low-concentration gas engine and its gas supply method, which includes a main combustion chamber and a pre-combustion chamber, and also includes a preheating zone, a first valve, a second valve, a third valve and a first booster compressor; the preheating zone is used to preheat the low-concentration gas, and transfer the preheated low-concentration gas to the main combustion chamber for combustion; the flue gas outlet of the main combustion chamber is connected in parallel with the preheating zone and the first valve through a pipeline, To provide high-temperature flue gas to the preheating area, open the first valve, and discharge the flue gas from the preheating area and the main combustion chamber; there is an air intake channel at the combustion chamber of the pre-combustion chamber, and the air intake channel is connected to the second valve through a pipe, and opened The second valve is used to transmit pure natural gas to the combustion chamber of the pre-combustion chamber; with this scheme, dry gas gas can be introduced and low-concentration gas can be fully preheated to burn lower-concentration gas and low-concentration gas The minimum concentration limit of gas can reach about 5.5%.

Description

technical field [0001] The invention relates to the technical field of engine combustion, in particular to a high-power low-concentration gas engine and a gas supply method thereof. Background technique [0002] Gas is an important source of serious natural disasters in coal mines. The existence of gas makes people suffocate, and it will explode when encountering a fire source. Gas explosion can also easily cause coal dust explosion. More than 70% of major coal mine disaster accidents in our country are gas accidents. Gas is not only harmful gas, but also clean energy. Through gas drainage and comprehensive utilization, gas can be turned from harm to benefit and waste into wealth. At present, foreign generator sets have strict restrictions on the use of gas, usually only suitable for high-concentration gas of more than 25%, and some manufacturers are suitable for gas of more than 15%. The utilization of gas in gas engines has laid a foundation, and the concentration of ga...

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Problems solved by technology

[0003] In the prior art, many engines that can utilize low-concentration gas have been developed, but the minimum concentration limit of the developed engines such as spark plug points or gas engines for low-concentration gas is about 8.5%, and for low-concentration gas below the concentration limit 8.5% Concentrated gas will be burned to generate electricity or evacuated when it cannot be used, the utilization efficiency is low, and it will cause environmental pollution

[0004] The main problem of lower concentration gas utilization is the difficulty of ignition. It is difficult to ignite the mixed gas with a concentration below 8.5% with a common spark plug, and the low concentration gas also contains a large amount of water during the transportation process, which makes ignition even more difficult.

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