A vehicle-mounted hydrogen production device based on microwave reforming methane steam

Abstract

The invention belongs to the technical fields of hydrogen production and hydrogen-mixed-fuel automobiles, and discloses a vehicle-mounted hydrogen production device based on reforming methane steam bymicrowave. The device comprises a microwave source which is connected to a cooling water tank of an internal combustion engine, an exhaust preheating tube, a quartz reaction tube, a reaction tube metal sleeve, a circulator, an electric tuner and a short-circuit piston; the exhaust preheating pipe is connected with one end of the microwave source and one end of the quartz reaction tube; the circulator is connected with the microwave source and the electric tuner; the electric tuner is connected with the short-circuit piston through a standard waveguide; the other end of the quartz reaction tube penetrates through a resonant cavity in the standard waveguide; and the reaction tube sleeve sleeves the part protruding out of the standard waveguide of the quartz reaction tube. In the device provided by the invention, an engine cooling water system and exhaust waste heat are effectively utilized for meeting the requirements of a large amount of water and heat of hydrogen production by reforming methane steam by using microwave plasma, the structure is optimized, the methane conversion rate is improved, and the practicability is high.

Description

technical field [0001] The invention belongs to the related technical fields of hydrogen production and hydrogen-doped fuel vehicles, and more specifically relates to a vehicle-mounted hydrogen production device based on microwave reforming of methane steam. Background technique [0002] As people pay more and more attention to the protection of the atmospheric environment, exhaust emissions from internal combustion engine locomotives, one of the main sources of air pollution, once pushed internal combustion engine locomotives to the cusp of public opinion, and further made energy saving and substantial emission reduction become a major issue for internal combustion engines. The top priority for the development of the locomotive industry. [0003] Hydrogen, as the cleanest renewable energy, produces only non-polluting water after its oxidation reaction releases energy. Hydrogen has attracted the attention of automotive power engineers because of this unique characteristic. ...

AI Technical Summary

Problems solved by technology

[0006] The technology of microwave plasma reforming methane vapor to produce hydrogen has been mature in theory, but because this technology needs to use a large amount of water and heat, and the hydrogen produced contains a certain proportion of carbon monoxide, this technology is more popular than other methods in industrial mass production. not dominant

In addition, those skilled in the art have also done some research. For example, Chinese patent 01118721.2 discloses a microwave-excited methane conversion process for hydrogen production, which allows methane to pass through a reaction zone that is irradiated by microwaves and placed with substances that are prone to discharge under the action of an electromagnetic field. And stay for 1 minute to 10 minutes, let the plasma generated by the discharge material crack methane to produce hydrogen; the methane conversion rate of this process is high, the reaction is easy to control, and has certain application prospects. However, this hydrogen production method is more dependent on the discharge material. The hydrogen production device is relatively complex and bulky, and the hydrogen production method will generate a large amount of carbon particles attached to the discharge material at the same time, hindering the continuation of the reaction, and is not suitable for direct application to automobiles; another example is Chinese patent 201310007863 A microwave low-temperature plasma reforming gas system for vehicle-mounted on-line hydrogen production is disclosed. This patent involves cylindrical and rectangular resonant cavities. The multi-directional tangential input method generates vortex airflow in the reaction chamber to generate stable plasma. The plasma reacts with gasoline, diesel, alcohol, water and other mixtures to prepare hydrogen-rich gas; this invention is based on microwaves, adding spark plugs in the reaction chamber, using high-voltage arc discharge to form plasma, and then using microwaves to maintain Plasma has certain practicability; however, the metal head of the spark plug will hinder the development of the plasma, and will also hinder the interaction between the mixed gas and the plasma, reducing the conversion efficiency, and the spark plug needs to be replaced after the service life is reached, and the operation is cumbersome; The electric field distribution formed in the resonant cavity is difficult to be uniform, and it is difficult to maintain a stable space plasma, and the design and installation of multiple nozzles make the structure of the reaction cavity complex, and the stability of the system is affected; if the heat generated by the magnetron is not enough To heat the mixed gas to a sufficient temperature, a more efficient preheating system needs to be designed; in addition to producing hydrogen, the reforming hydrogen production process will also generate a part of carbon monoxide, acetylene and carbon particles, without further treatment, if it is directly applied to hydrogen fuel cells In cars, the carbon monoxide must be separated from the hydrogen, which creates new problems

Images