Combustion system and method for high-power lean-burn natural gas engine based on ozone combustion

Abstract

The invention discloses a high-power precombustion-chamber lean-combustion natural gas engine combustion system based on ozone combustion-supporting and a method. The system comprises a natural gas pipeline, a buffer tank, a Venturi mixer, a pressurizer, an intercooler, an ozone generator and a precombustion-chamber gas inlet one-way valve. Natural gas and air are mixed in the Venturi mixer and then transmitted to the pressurizer, the mixture is pressurized through a gas compressor of the pressurizer and then enters the intercooler, the mixed gas of the natural gas and the air is cooled through the intercooler and then transmitted to a main combustion chamber in one way and to the ozone generator in another way, the ozone generator generates natural gas, air and ozone mixed gas which is sprayed into a precombustion chamber through a mixed gas spraying module, an electronic control unit (ECU) controls a precombustion-chamber ignition system to ignite the indoor natural gas, air and ozone mixed gas for precombustion, and waste gas generated after combustion is transmitted to a turbine of the pressurizer through an exhaust manifold, subjected to working through the turbine of the pressurizer and then discharged out of an engine, so that the combustion and emission performance of the high-power lean-combustion natural gas engine is improved, and the lean-combustion limit is widened.

Description

technical field [0001] The invention relates to the field of engines, in particular to a combustion system and method of a high-power pre-combustion chamber lean-burn natural gas engine based on ozone combustion. Background technique [0002] Studies have shown that lean combustion technology can improve the thermal efficiency of natural gas engines, and is currently widely used in low-speed and high-power gas fuel engines. The physical and chemical characteristics of natural gas determine that there are problems such as high ignition energy and slow flame propagation speed in the combustion process, and the above problems will be more serious under lean combustion conditions. The fundamental reason for the high ignition energy and slow flame propagation speed of methane is that the molecular structure of methane fuel has only C-H bonds. Generally, the C-H bond energy in the molecular structure of organic compounds is 415.2kJ / mol, while the C-C bond energy is 347.3kJ / mol. S...

AI Technical Summary

Problems solved by technology

Generally, the C-H bond energy in the molecular structure of organic compounds is 415.2kJ / mol, while the C-C bond energy is 347.3kJ / mol. Since the C-H bond energy is relatively large, more energy is required for bond breaking, resulting in a higher ignition energy. slow flame spread

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