The difference between the Natural Gas Engine and Diesel Engine

The fundamental difference between gas vehicles and diesel vehicles is that the engine is different, and its working principle is greatly different. The diesel engine is a compression ignition type, with an ignition point of 220
℃; The gasoline engine is spark ignition with an ignition point of 427 ℃; And natural gas is ignited, with an ignition point of 650 ℃. Fuel engines (such as cars) are driven by pistons and cylinders. A gas engine (thermal power generation) is a type of engine where gas is sprayed onto a turbine and drives it to rotate.
1. Fuel difference: Natural gas vehicles refer to vehicles that use natural gas as fuel (including compressed natural gas CNG and liquefied natural gas LNG), so their engines are dedicated to natural gas, and the fuel is stored in gas cylinders; A diesel vehicle refers to a vehicle that uses diesel as its fuel. Its engine is a conventional diesel engine, and the fuel is stored in the fuel tank. The fuel supply system of vehicles may vary depending on the fuel used.
2. The combustion products of engines are different: the main combustion products of natural gas vehicles are water and carbon dioxide, and the exhaust gas does not contain sulfides and lead. Carbon monoxide is reduced by 80%, hydrocarbons are reduced by 60%, and nitrogen oxides are reduced by 70%, which is beneficial for environmental protection; In addition to water and carbon dioxide, the combustion products of diesel vehicles also contain a large amount of CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), PM (particulate matter, soot), etc.
3. The engine cooling water path is different: liquefied natural gas needs to absorb the heat of the engine to convert liquid natural gas into gasified natural gas for supply to the engine, so the hot water of the engine needs to be connected to the cylinder vaporizer through a rubber pipe.
4. Different exhaust systems: Generally, the exhaust system of LNG vehicles includes a three-way catalytic converter. The three-way catalytic converter is the most important external purification device installed in the automotive exhaust system. It can convert harmful gases such as CO, HC, and NOx discharged from the automotive exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction. Assembly sequence of exhaust system: exhaust pipe, exhaust brake butterfly valve, exhaust pipe, flexible hose, exhaust pipe, three-way catalytic converter, muffler