Ultralow-concentration gas machine combustion system and control method thereof

Abstract

The invention provides an ultralow-concentration gas machine combustion system and a control method thereof. The ultralow-concentration gas machine combustion system comprises an air exhaust turbocharging device, an ultralow-concentration gas pressurizing inlet device, a diesel common-rail micro-jet ignition device, a diesel injector cooling circulation device, an EMS control unit and a pluralityof cylinders, wherein the air exhaust turbocharging device can improve the air inlet pressure and efficiency, the ultralow-concentration gas pressurizing inlet device can improve the gas inlet densityto meet the requirements of different loads for a high-pressure gas flow rate, and the diesel injector cooling circulation device decreases the combustion temperature of an injector under a high loadand greatly lowers the probability that the ejector burns down or gets stuck. Under the combined action of all the devices, normal ignition and normal combustion based on the ultralow-concentration gas machine combustion system are realized, and normal starting and operating of a gas machine are ensured.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to an ultra-low concentration gas engine combustion system and a control method thereof. Background technique [0002] With the depletion of non-renewable petrochemical energy worldwide and the gradual deterioration of the human living environment, people pay more attention to the comprehensive utilization of energy such as efficient utilization of energy, energy conservation and emission reduction. The gas generator set fueled by coal mine gas has made great contributions to the comprehensive utilization of energy, green energy saving and emission reduction, and has achieved unprecedented development in this field. The fuel supply, ignition and automatic control of the gas engine have always been the key core issues of research in this field. Most of the existing gas generators in coal mines adopt the mixed intake method of gas and air premixed before pressuriz...

AI Technical Summary

Problems solved by technology

Most of the existing gas generators in coal mines adopt the mixed intake method of gas and air premixed before pressurization and then pressurized. The ignition mainly depends on spark plugs or pre-combustion chamber spark plugs. The degree of automation control is not high, and it is only suitable for methane concentrations of 10 More than % of methane gas

When the methane concentration in the fuel is less than 10% (i.e. ultra-low concentration gas), there will be the following problems: 1. When the usual gas enters the gas machine, the gas pressure is generally 1kPa~5kPa, and when the methane concentration is lower than 10%, the gas pressure The lower, lower pressure and lower concentration gas supply volume cannot meet the gas engine's normal operating power output or the intake demand when the load changes suddenly, and it cannot guarantee the normal operation of the gas engine; 2. The existing premixed Due to the overlapping angle of the intake and exhaust valves of the gas engine, part of the gas escapes from the exhaust valve, and the thermal efficiency of the gas engine is reduced. At the same time, there may be a risk of explosion in the exhaust pipe or the escaped methane will be discharged into the atmosphere to produce a greenhouse effect; 3. Gas engines mostly use ordinary spark plugs or pre-combustion chamber spark plugs. When the methane concentration is lower than 10%, the concentration of gas that enters the cylinder after being mixed and pressurized is lower, and it is difficult for the spark plug to ignite normally, causing frequent misfires Occurs, which leads to abnormal combustion in the cylinder

Therefore, when the existing gas generators use ultra-low concentration gas as fuel, their rotation speed is unstable, their combustion is unstable, they cannot output power, and even cannot start and operate normally, and cannot guarantee the normal power generation and operation needs of the power station at all.

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