Heavy natural gas engine combustion system

Abstract

The invention discloses a heavy natural gas engine combustion system. The system comprises an air cylinder and a cylinder cover covering the air cylinder, the cylinder cover is provided with a composite air inlet channel composed of a vortex air inlet channel and a straight tumble air inlet channel and communicates with the interior of the air cylinder through an air inlet gate provided with an air inlet valve, the air inlet valve is arranged on a valve seat, The air inlet gate is located in the whole valve seat, two exhaust passage inlets communicate with the interior of the air cylinder through exhaust valves arranged on the cylinder cover, a spark plug device is installed in the center of the bottom face of the cylinder cover, a steel piston is arranged in the cylinder cover, and the bottom face of the cylinder cover, the inner wall face of the air cylinder and the top face of the piston define a space which serves as a necking-down type combustion chamber, and gas supply and injection systems are respectively arranged on the two gas inlet channels or the bottom surface of the cylinder cover. The system is simple and compact in structure and convenient in manufacturing and assembly, low heat dissipation is achieved through the steel piston, meanwhile, inlet air flow can form oblique axis vortex around the central axis of the cylinder through the composite air inlet channel, turbulent kinetic energy in the cylinder is improved, and then heat efficiency is improved.

Description

technical field [0001] The invention relates to an engine combustion system, more precisely, relates to a heavy-duty natural gas engine combustion system. Background technique [0002] Heavy-duty natural gas engines have advantages in achieving low-carbon and clean combustion. However, due to the relatively large space scale of the combustion chamber of heavy-duty engines and the low flame propagation rate of natural gas, the knocking tendency is increased, which limits the increase in compression ratio. These factors have a great impact on thermal efficiency. bring adverse effects. At the same time, because the stoichiometric air-fuel ratio or slightly lean mixture is usually used, the combustion temperature in the cylinder is high. On the one hand, the heat transfer loss is large, which affects the thermal efficiency. On the other hand, the engine heat load is high, which affects the reliability. In addition, heavy-duty natural gas engines mostly use aluminum alloy piston...

AI Technical Summary

Problems solved by technology

[0002] Heavy-duty natural gas engines have advantages in realizing low-carbon and clean combustion. However, due to the relatively large space scale of the combustion chamber of heavy-duty engines and the low flame propagation rate of natural gas, the knocking tendency is increased, which limits the increase in compression ratio. These factors have a great impact on thermal efficiency. bring adverse effects

At the same time, because the stoichiometric air-fuel ratio or slightly lean mixture is usually used, the combustion temperature in the cylinder is high. On the one hand, the heat transfer loss is large, which affects the thermal efficiency. On the other hand, the engine heat load is high, which affects the reliability.

In addition, heavy-duty natural gas engines mostly use aluminum alloy pistons, which have large heat transfer losses, poor mechanical load and thermal load bearing capacity, and are difficult to meet reliability requirements

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