Gas supply system and method for improving frequency response of natural gas engine based on pre-combustion chamber enrichment

Abstract

The invention discloses a gas supply system and method for improving frequency response of a natural gas engine on the basis of gas concentrating in a pre-combustion chamber. The system comprises thepre-combustion chamber, a main combustion chamber, a pre-combustion chamber independent gas inlet jetting device and a system controller; and the pre-combustion chamber communicates with the main combustion chamber through a lower connecting channel, a spark plug and an installation channel of the independent gas inlet jetting device are arranged above the pre-combustion chamber, the independent gas inlet jetting device is used for arranging a nozzle in the pre-combustion chamber through the installation channel, and the system controller controls opening and closing of the pre-combustion chamber independent gas inlet jetting device to enable the pre-combustion chamber independent gas inlet jetting device to jet the pre-combustion chamber independent inlet gas into the pre-combustion chamber so as to increase the concentration of mixed gas in the pre-combustion chamber, and change the concentration of mixed gas in the main combustion chamber.

Description

technical field [0001] The invention relates to the field of improving the frequency response of natural gas engines, in particular to an air supply system and method for improving the frequency response of a pre-chamber type large-bore natural gas engine based on a pre-chamber independent air intake device. Background technique [0002] The shortage of petroleum resources and the pollution of the ecological environment have become two major obstacles restricting the development of the internal combustion engine industry at this stage. Finding efficient and clean alternative energy sources and successfully using them in construction machinery and vehicle engineering has become an urgent research and solution for all countries in the world. technical problems. Among many alternative energy sources, natural gas has attracted widespread attention due to its high calorific value, clean combustion emissions, and abundant reserves in the world. Among them, large-bore natural gas ...

AI Technical Summary

Problems solved by technology

However, when the load is suddenly increased in actual use, the intake air volume is difficult to keep up with after increasing the throttle opening, and for the engine that adopts the intake premixing method of the mechanical mixer, it is difficult to accurately control the change of the mixture concentration. To sum up the above reasons, when the natural gas engine is suddenly loaded, the intake air volume and concentration of the mixture cannot respond to the load demand in time, resulting in fluctuations in the engine speed under transitional conditions and a decrease in the stability of the engine operation

For a natural gas engine equipped with an exhaust gas turbocharger, the energy source for the supercharger to supercharge the intake air is the exhaust gas of the previous working cycle. When the load is suddenly increased, the exhaust energy of the engine is insufficient, making the supercharger At this time, the supercharger not only cannot effectively boost the intake air of the engine, but also brings resistance to the intake air, so that the intake air volume cannot meet the demand, and the engine running stability becomes poor.

[0004] To sum up, in order to meet the thermal efficiency and emission requirements of the existing pre-chamber natural gas engine, lean combustion is organized in the main combustion chamber. Responding to the load demand in time, the engine speed fluctuates significantly, resulting in low engine operation stability

Images