Combustion device and method for a dual-fuel engine based on a dual-needle valve injector

Abstract

The invention relates to the field of dual-fuel engines, in particular to a dual-fuel engine combustion device and method based on a double-needle-valve oil atomizer. The dual-fuel engine combustion device based on the double-needle-valve oil atomizer comprises an air distribution system, a fuel supply system and a combustion chamber system. The air distribution system is located on an air cylinder cover. An air inlet part and an exhaust part are symmetrically distributed at the two ends of the air cylinder cover. The fuel supply system is located on the air cylinder cover and is right opposite to the lower combustion chamber system. The combustion chamber system is formed by connecting the air cylinder cover and an air cylinder through bolts. The dual-fuel engine combustion method based on the double-needle-valve oil atomizer comprises the steps that firstly, the dual-fuel engine is in a gas mode; and secondly, the diesel oil mode is switched when the dual-fuel engine is in starting and idling work conditions. Dual-fuel engine gas and fuel oil dual modes are rapidly and flexibly switched, mixed gas concentration layering in the dual-fuel engine gas mode is achieved, and accordingly power performance, economic efficiency and discharging performance of the fuel are improved.

Description

technical field [0001] The invention relates to the field of dual-fuel engines, in particular to a dual-fuel engine combustion device and method based on a double-needle valve injector. Background technique [0002] Due to the development of internal combustion engines, problems such as energy crisis and air pollution have been brought about. In urban environmental pollution, CO, HC compounds, and NO emitted from vehicle exhaust X , and PM have become the main pollution sources of urban atmospheric environment. This causes severe weather phenomena such as urban smog and acid rain. SO in ship engine exhaust X and NO X It has become the main source of pollution in ports, straits, sea areas with heavy ship traffic and inland river surrounding areas. The pollution caused by internal combustion engine emissions to the atmospheric environment has attracted widespread attention from the international community. Countries around the world have successively formulated strict emis...

AI Technical Summary

Problems solved by technology

There are three problems: one is that two installation holes need to be arranged on the cylinder head, and the area of ​​the cylinder head is certain, which increases the loss of the cylinder head; the other is that when the gas mode fails or starts and idles, it needs to switch to diesel mode, due to the different supply methods of diesel and natural gas, when the two modes are switched, it will cause engine fluctuations, and the two injectors will also be switched at the same time, which will cause a switching delay and affect the stability of the engine; in addition, diesel / Natural gas dual-fuel engine gas supply method generally adopts intake port injection, which makes the charging efficiency low and reduces the output power of the engine

However, the structure of the device is relatively complicated, and the working stability and fuel economy of the engine still need to be improved.

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