The practice of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation of the invention, only for example. At the same time, the advantages of the present invention will become more clear and easy to understand.
Referring to the accompanying drawings: Full immersion self-circulating evaporation cooling in-vehicle fuel cell system, including a metal sealing box 1 that is filled with evaporating cooling medium, a fuel cell stack 2 in a metal sealing box 1, with a metal sealing box 1 The level replenishment device 3 connected on the top of the left side is connected to the hydrogen storage tank 4 connected to the right side of the metal sealing box 1;
The lower portion of the metal sealing box 1 has a windshield 11, an upper and top of the heat dissipation structure 12;
The liquid level replenisher 31 includes a dielectric expansion compensation tank 31 and a first exhaust valve 32 located at the top of the medium expansion compensation tank 31; the lower side of the medium expansion compensation tank 31 is connected to the metal sealing box 1, the medium expansion compensation case 31 At the bottom of the metal sealing box 1 side;
Also includes a medium recovery device 6; the top of the medium recovery device 6 is connected to the upper left side of the metal sealing box 1 by the pressure relief valve 61, and the medium release valve 62 is connected to the metal sealing box 1 side, and the medium The bottom of the recovery device 6 is connected to the second exhaust valve 63.
The left side of the upper end of the metal sealing box 1 has a dielectric liquid level meter 13; the medium expansion compensation case 31 is connected to a dielectric level meter 13.
Also included in the leakage collection storage between the top right of the metal sealing box 1; the leakage collecting storage room 7 has a hydrogen oxygen in-line monitoring device 71, and the top of the leakage collecting storage room 7 is connected to the third exhaust valve 72.
The leakage collection room 7 side has a viewing window 73.
The hydrogerative sealing electro-hydrogen interface 41 of the hydrogen storage tank 4 is connected to the fuel cell stack 2 by the first valve 51; the fuel cell stack 2 is communicated with the outside.
The heat dissipation structure 12 is a structure with a cooling wing or a heat sink.
The dielectric level gauge 13 is a liquid level flap type or other type liquid level meter with a float valve.
In actual use, fuel cell stack 2 is used for hydrogen and oxygen reactions, generating electricity and water;
The metal sealing box 1 box material is a metal material having a high heat conductive system, the upper portion and the top of the metal sealing box 1 are heat dissipation structures 12; the fuel cell stack 2 is fully immersed in a metal sealing box 1 filled with evaporative cooling medium, various lines Leave the flange interface.
The medium expansion compensation case 31 can supplement the liquid level in the metal sealing box 1 to ensure the expansion of the cooling medium when the metal sealing box is 1 box, and the expansion of the cooling medium is evaporated when absorbing the fuel cell stack 2.
The first valve 51 and the second valve 52 are used to release a medium pressure that exceeds the safety or set of media, and the release medium is recovered by the medium recovery device 6.
The observation window 73 is used to observe the two-phase flow state of the medium medium in the metal sealing box.
Leakage collection 7 is used for short-term storage of leaks;
The hydrogen oxygen is used to measure the alarm when it is used to measure hydrogen, oxygen or mixed gas leakage.
The medium release valve 62 is provided at the bottom of the casing for releasing the medium in the metal sealing box 1 case, and the release medium is recovered by the medium recovery device 6.
The medium recovery device 6 reclaims the medium released by the first valve 51, the second valve 52, and the medium release valve 62.
Medium level gauge 13 is used to discuss a liquid level of the medium in the medium expansion compensating case 31.
A leak detection alarm is provided at each valve for detecting media leakage and hydrogen leakage of detecting box interfaces, seals, etc..
The present invention uses a full-circumjured, self-circulating fuel cell cooling, isolation protection system: all immersed the fuel cell stack 2 and its linked hydrogen, oxygen, water pipeline, etc., in a closed metal sealing box 1, metal sealing box 1 is filled with insulation, non-combustible, low boiling point, such as HFC-4310), the upper portion and the top of the metal sealing box 1 have a heat dissipation structure 12, and the heat through the heat of the fuel cell stack 2 is made when the fuel cell stack 2 operates. Exceeding the boiling point (e.g., 55 ° C), absorb heat, and form two-phase flow pressure head, internally cyclic cooling; in the present invention, the fuel cell stack 2 is fully immersed and closed within the metal sealing box 1, effectively prevents unit cells The gas is mixed, and the external air is completely isolated and the harmful static electricity, open flame, thereby greatly improving the safety of the fuel cell vehicle; at the same time, the cooling of the hydrogen fuel cell can not require an external device or input cooling medium, more efficient Energy saving is safe and reliable.
The operation method of the present invention includes the following steps:
Step 1: Secure the fuel cell stack 2 in the metal sealing box 1, the metal sealing box 1 adopts the upper flange closure; the vacuum pump extracts the air within the metal sealing box 1, and then injects evaporative cooling medium by the medium filling port until the liquid The position of the medium expansion compensation tank 31 in which the metal sealing box 1 is connected, that is, the filling of the evaporation cooling medium is completed; when the evaporation cooling medium is filled, the in-vehicle fuel cell system can be operated in various conditions of vehicle operation. Work;
Step 2: The in-vehicle fuel cell system is usually in self-cycling, maintenance-free state, and the evaporation cooling medium is formed to form two-phase flow and internal circulation, the expansion compensation tank 31 absorbs the thermal expansion and the vehicle operation. Variation, impact , Inertial force.
When there is a leakage of trace hydrogen, the characteristics of hydrogen can not solve in the evaporation cooling medium, which will be concentrated in the leakage collection storage room 7, and when the hydrogen oxygen is measured, the hydrogen oxygen is measured, and the alarm is issued. ;
When there is hydrogen, oxygen continuous leaks, or due to the internal temperature rise, the pressure release valve 61 opens, releases the dangerous pressure, and automatically controls the housing hydrogen storage tank 4 hydrogen Pipe, stop the fuel cell stack 2 reaction.
The evaporative cooling medium can be recovered by the medium recovery device 6 and then injected into the metal sealing box 1 by the filling pump and the valve.
Since the in-vehicle fuel cell stack is fully immersed in an externally insertion of the heat exchanger, a low boiling point is low, and hydrogen, oxygen is difficult, and therefore, it can be completely isolated and the dangerous fire source, so that the vehicle is operated The static protection problem of fuel cell stack is completely solved. The present invention only takes only a fuel cell vehicle as an example, and when a fuel cell stack is used for rail traffic, the same principles and methods may be employed.
Other unmeated parts are all in the prior art.