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The hydrogen refueling machine is the core equipment for hydrogen refueling of fuel cell vehicles. Due to the characteristics of the equipment, the operating conditions of these equipment are quite harsh, and they are in a high temperature, high pressure, flammable, explosive hydrogen environment. Therefore, it is possible that the equipment of other types of devices will not or will not be easily corroded or damaged.

Chongqing Houhai, founded in 2014, is a supplier of overall solutions for natural gas filling station equipment. The company's core technical team has many years of experience in the design and manufacturing of hydrogen dispensers and CNG/LNG filling station equipment, and is also one of the drafting units of the national standards GB/T31138-2014 Compressed Hydrogen Dispensers for Vehicles and GB/T36126-2018 LNG Dispensers for Vehicles, He also participated in and completed the National 863 Project Research on Key Equipment of Hydrogenation Station (Hydrogenation Machine).

Ren Xingping revealed that Chongqing Houhai was deeply engaged in the field of natural gas at the beginning of its establishment. Up to now, relevant gas filling equipment has been applied in many gas stations in China. Based on the company's years of experience in natural gas injection equipment, and the technical principles of hydrogen injection equipment and natural gas injection equipment are similar, the company is convenient to start the research, development and manufacturing of hydrogenation machine in recent years. However, unlike the natural gas refueling equipment, the hydrogen injection pressure reaches 35Mpa or 70Mpa, which is much higher than the natural gas pressure of 25Mpa. Therefore, the pressure bearing capacity and safety requirements for the hydrogenation machine are higher.

Ren Xingping said that from the current market development, the volume of hydrogen fuel cell vehicles is not enough to support large-scale production of hydrogen refueling machine manufacturers. At the same time, in terms of domestic hydrogenation machine R&D technology, core components such as flow meters, hydrogenation guns, pipeline valves, etc. are excessively dependent on imports. At present, in order to ensure the reliability of equipment, manufacturers are more willing to choose imported parts, so it is difficult to reduce the cost. At present, many domestic manufacturers are also carrying out component localization, but there needs to be a process of test and verification. Localization is the development direction.

The hydrogenation machine is a metering terminal and trade settlement equipment in the hydrogenation station. Its working principle is: the compressed hydrogen enters the hydrogenation machine through the transmission pipeline, flows through the control valve, one-way valve, mass flowmeter, pull off valve, high-pressure hose, ball valve hydrogenation gun, and finally flows into the cylinder of the inflated vehicle. In this process, the mass flowmeter measures the mass of the gas flowing through the dispenser and transmits it to the computer control part of the dispenser. The computer calculates the corresponding volume (mass) and amount and displays them to the user on the display screen of the dispenser, thus completing the primary hydrogenation process.

Ren Xingping revealed that the valves, flowmeters and hydrogenation guns involved in the process were basically imported from abroad, accounting for most of the cost of the whole hydrogenation machine. Therefore, the company will try to deepen the research and development of core parts in the future, so as to reduce the cost of the hydrogenation machine and improve the core competitiveness of the product.

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