Vaporization device for liquefied natural gas supply system for automobile

Abstract

The invention provides a vaporization device for a liquefied natural gas supply system for an automobile. The vaporization device for the liquefied natural gas supply system for the automobile comprises a box, a cooling assembly, a gasification assembly, a supercharging assembly and a blow-off assembly. The cooling assembly, the gasification assembly, the supercharging assembly and the blow-off assembly are all connected with the box. The gasification assembly and the supercharging assembly are arranged in the box. The cooling assembly is arranged on the box. The blow-off assembly is arranged under the box. According to the vaporization device for the liquefied natural gas supply system for the automobile, threaded coil pipes are used for vaporization and supercharging correspondingly, the tube pass is increased to the maximum extent through the coil pipes, and the heat exchange area is enlarged through a threaded pipe; and meanwhile, through a spraying pipe at a water inlet, circulating water is made to flow more comprehensively and smoothly, and the heat utilization rate of circulating water is increased; and by the adoption of the scheme, under the condition that the size of a vaporizer is limited, the heat exchange effect is greatly improved, and normal operation of the automobile is guaranteed.

Description

technical field [0001] The invention belongs to the field of liquefied natural gas gas system for vehicles, in particular to a vaporization device for a liquefied natural gas gas supply system for vehicles. Background technique [0002] Liquefied Natural Gas (LNG for short) is a clean energy recognized in the world today. It has high calorific value, sufficient combustion, low price, good transportation economy and safety, and is very popular among users. The temperature of LNG is about -162°C, the pressure is about 0.1MPa, and the density is about 423kg / m3. The volume after gasification is about 600-624 times the liquid volume, and the capacity of LNG vehicle-mounted gas cylinders with the same volume is 2.5 times that of CNG. Vehicles that use LNG as fuel have such problems during use. The liquid pressure in the gas cylinder is generally about 0.5MPa, while the intake pressure of the engine is generally required to be 0.7-0.8MPa. The pressure of the low-temperature liqui...

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Problems solved by technology

Vehicles that use LNG as fuel have such problems during use. The liquid pressure in the gas cylinder is generally about 0.5MPa, and the intake pressure of the engine is generally 0.7-0.8MPa. The pressure of the low-temperature liquid in the gas cylinder is increased to ensure that the liquid in the cylinder can be continuously and stably output under the drive of this pressure, and then the output low-temperature liquid is converted into natural gas, and the gas pressure is stabilized at 0.7-0.8MPa before the engine , the temperature is maintained at about 30°C to 50°C to meet the requirements of the engine; at present, in the gas supply system of domestic LNG vehicles, the principle of the device used to realize the vaporization function mainly adopts stainless steel coils and spiral fins However, due to the limitation of the installation space and the limited heat exchange area, the vaporization device often cannot achieve the expected vaporization capacity, resulting in insufficient air supply or insufficient temperature for the car; some schemes use electric heating to increase Large vaporization effect, but due to the characteristics of LNG, this solution also has a large potential safety hazard

In the device involved in a certain patent, the scheme uses stainless steel coil tubes and spiral finned tubes for vaporization heat exchange inside the carburetor. The spiral finned tubes are mainly used for gas cylinder pressurization. Due to the short tube length, the pressurization speed Not strong; while stainless steel coils are used for LNG vaporization and need to reach a certain pressure and temperature, the existing structure often fails to achieve the expected effect, especially in winter, vehicles often have insufficient gas supply

In the device involved in another patent, the solution is to increase the vaporization effect to achieve the expected pressure and temperature, and an electric heating device is installed inside the device. Although this solution can achieve the expected effect, due to the characteristics of LNG, once Failure will lead to serious consequences, so the utilization rate in the market is extremely low

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