Broad-spectrum fuel cell fuel feeding system and working method thereof

Abstract

The invention provides a broad-spectrum fuel cell fuel feeding system and a working method thereof, and relates to the technical field of fuel cell power generation systems, the broad-spectrum fuel cell fuel feeding system comprises a fuel feeder, a fuel conduit, a pump body assembly and a fuel tank; the other end of the fuel output pipe is connected with a pressure release valve, the pressure release valve is connected with the lower end of a pump-out plate penetrating pipe, the pump-out plate penetrating pipe penetrates through the pump body cover plate, the upper end of the pump-out plate penetrating pipe is connected with one end of a pump-out pipeline, the other end of the pump-out pipeline is connected with a fuel pump, and the fuel pump is connected with one end of a pump-in pipeline. The other end of the pumping-in pipeline is connected with the upper end of a fuel input pipe, the fuel input pipe penetrates through a pump body cover plate, the lower end of the fuel input pipe is connected with a filter, and the pump body assembly is connected with a fuel tank through a bolt. The problems of unstable system output power, short service life, poor economical efficiency, complex structure, difficulty in maintenance and the like caused by poor feeding adaptability and poor feeding precision of various fuels of the existing fuel cell power generation system can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell power generation systems, and more particularly, to a wide-spectrum fuel cell fuel feeding system and its working method. Background Art

[0002] With the rapid development and wide application of intelligent, digital, and information-based military equipment, it is of great significance to develop efficient, safe, and reliable power energy systems. The current military power energy mainly includes battery power and diesel / gasoline generator power. However, the specific energy of the battery is relatively low, the charging time is long, and the energy replenishment must rely on the power grid, which limits the working duration or combat radius of weaponry and is difficult to cope with complex battlefield environments. The traditional diesel / gasoline generator has strong special signals such as noise, vibration, and infrared during operation, greatly reducing the combat concealment. Moreover, when war breaks out, it is difficult to ensure the supply of imported diesel / gasoline fuel. The wide-spectrum fuel cell power generation system combines fuel reforming hydrogen production technologies such as hydrocarbons and alcohols with high-temperature proton exchange membrane fuel cell technologies. It has a wide range of fuel types, is easy to obtain, and can subvert the battlefield fuel supply mode, making this technology increasingly a research hotspot.

[0003] The fuel feeding system is a key component of the wide-spectrum fuel cell power generation system. The main function of the fuel feeding system is to achieve the fuel supply required by the wide-spectrum fuel cell power generation system, mainly involving the fuel spray start-up supply and the hydrogen production fuel supply for the reforming reactor. During the system spray start-up, high-pressure fuel needs to be matched with the nozzle to produce an atomization effect, which is convenient for ignition and combustion, generating high-temperature flue gas to heat up and start the reforming reactor. If the pressure is insufficient, the atomization effect is poor, and carbon deposition is likely to occur, resulting in the attenuation of the reforming catalyst activity. During the system operation stage, the fuel feeding system provides precise fuel quantity for hydrogen production in the reforming reactor and supplies it to the fuel cell stack for discharging. The fuel feeding quantity corresponds one-to-one with the discharging current of the fuel cell stack. If the fuel feeding quantity is too low, the fuel cell stack will be damaged due to lack of gas. If the fuel feeding quantity is too high, the system efficiency will be reduced. Therefore, the feeding accuracy of the fuel feeding system is extremely important.

[0004] Most of the existing fuel cell fuel feeding systems use single fuels such as methanol and ethanol. Due to the different physical and chemical properties of different liquid fuels, they cannot be applied to multiple fuels. Among the existing fuel cell fuel feeding systems, one uses an electronic fuel injection system, where the fuel pump is built into the fuel tank. On the one hand, this fuel pump cannot meet fuels with corrosiveness, solubility, etc. On the other hand, the fuel pump is sealed in the fuel tank and is not easy to repair. Another uses a common rail system, where the high-pressure fuel pump is mostly in the range of dozens to hundreds of megapascals, far exceeding the commonly used pressure in the fuel cell system at the level of hundreds of kilopascals, resulting in system power loss. Moreover, this system has high requirements for fuel quality and poor economy. Summary of the Invention

[0005] The present invention provides a broad-spectrum fuel cell fuel feeding system and its working method, which can solve the problems of poor adaptability to various fuel feedings, poor feeding accuracy, unstable system output power, short service life, poor economy, complex structure, and difficult maintenance in existing fuel cell power generation systems.

[0006] The technical means adopted by the present invention are as follows:

[0007] A broad-spectrum fuel cell fuel feeding system includes a fuel feeder, a fuel conduit, a pump body assembly, and a fuel tank;

[0008] The fuel feeder includes a fuel output pipe, an injector, and a fuel collector. The fuel output pipe is connected to the fuel collector through the injector. The fuel collector is connected to one end of the fuel conduit, and the other end of the fuel conduit is connected to one end of the fuel output pipe on the pump body assembly;

[0009] The pump body assembly includes a fuel output pipe, a pressure relief valve, a pump-out through-plate pipe, a pump body cover plate, a pump-out pipeline, a fuel pump, a pump-in pipeline, a fuel input pipe, and a filter. The other end of the fuel output pipe is connected to the pressure relief valve. The pressure relief valve is connected to the lower end of the pump-out through-plate pipe. The pump-out through-plate pipe passes through the pump body cover plate. The upper end of the pump-out through-plate pipe is connected to one end of the pump-out pipeline. The other end of the pump-out pipeline is connected to the fuel pump. The fuel pump is connected to one end of the pump-in pipeline. The other end of the pump-in pipeline is connected to the upper end of the fuel input pipe. The fuel input pipe passes through the pump body cover plate. The lower end of the fuel input pipe is connected to the filter. The pump body assembly is connected to the fuel tank by bolts;

[0010] The fuel tank is provided with broad-spectrum fuel.

[0011] Further, the fuel output pipe is connected to the pressure relief valve through a pressure relief valve outlet ferrule. The pressure relief valve is connected to the pump-out through-plate pipe through a pressure relief valve inlet ferrule. The upper end of the pump-out through-plate pipe is connected to the pump-out pipeline through a pump-out ferrule. The other end of the pump-in pipeline is connected to the upper end of the fuel input pipe through a pump-in ferrule. The lower end of the fuel input pipe is connected to the filter through a filter inlet ferrule.

[0012] Further, the materials of the fuel output pipe and the fuel collector are 304L stainless steel or 316L stainless steel.

[0013] Further, the fuel feeder is single-way or multi-way fuel feeding.

[0014] Further, the fuel conduit is a corrosion-resistant pipe, and the fuel conduit is a flexible pipe or a rigid pipe.

[0015] Furthermore, the fuel output pipe, pressure relief valve outlet ferrule, pressure relief valve inlet ferrule, pump out plate tube, pump out ferrule, pump out pipeline, pump in pipeline, pump in ferrule, pump body cover, fuel input pipe, filter inlet ferrule and filter are made of 304L stainless steel or 316L stainless steel.

[0016] Furthermore, the pressure range of the pressure relief valve is 300-500 kPa, and the filtration accuracy range of the filter is 200-600 meshes.

[0017] Furthermore, the fuel pump is a metal gear pump.

[0018] Furthermore, the broad-spectrum fuel includes methanol, ethanol, gasoline, diesel, kerosene, fuel oil, dimethyl ether and biomass.

[0019] The present invention also provides a working method of a broad-spectrum fuel cell fuel feeding system, which is implemented based on any of the above broad-spectrum fuel cell fuel feeding systems and comprises the following steps:

[0020] During the system filling and exhaust stage, fuel is injected into the fuel tank and the fuel pump is turned on. At this time, the gas in the pipeline is discharged from the overflow port of the pressure relief valve;

[0021] During the system spray start-up phase, control is performed based on the amount of fuel required for system start-up and the relationship between the injector opening frequency and flow rate that has been calibrated in advance, and the injector is closed when the start-up is completed;

[0022] During the system operation phase, another injector is turned on and controlled and adjusted based on the relationship between the system discharge current and the required amount of fuel and the relationship between the injector opening frequency and flow rate that has been calibrated in advance;

[0023] During the system shutdown phase, shut down the injectors first and then the fuel pump.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The present invention provides a broad-spectrum fuel cell fuel feeding system and an operating method thereof. The system uses a selectable pressure value of a pressure relief valve (much greater than the reformer pressure) to ensure that the fuel feeding system is not affected by the pressure fluctuation of the reformer and the feeding is accurate. The system ensures flow through pressure and is independent of the physical properties of the fuel, and all components are made of corrosion-resistant materials to improve multi-fuel adaptability. The pressure relief valve of the system can be selected and adjusted to meet the feeding pressure without excessive pressure, thereby reducing the power consumption of the fuel pump. The system can match the filter mesh size according to the filtration accuracy requirements of the injector and the fuel pump, thereby reducing the fuel quality requirements and improving the economy. The fuel pump of the system is external, and the pipelines and joints are all made of standard parts, which are easy to repair and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 Structural schematic diagram of the present invention;

[0028] Figure 2 Schematic diagram of the fuel tank of the present invention;

[0029] Figure 3 Exploded view of the fuel feeder of the present invention;

[0030] Figure 4 Cross-sectional view of the fuel feeder of the present invention;

[0031] Figure 5 Schematic diagram of the pump body assembly of the present invention.

[0032] In the figure: 1. Fuel feeder; 11. Fuel output pipe; 12. Injector; 13. Fuel collector; 2. Fuel conduit; 3. Pump body assembly; 31. Fuel output pipe; 32. Relief valve outlet ferrule; 33. Relief valve; 34. Relief valve inlet ferrule; 35. Pump-out through-plate pipe; 36. Pump-out ferrule; 37. Pump-out pipeline; 38. Fuel pump; 39. Pump-in pipeline; 310. Pump-in ferrule; 311. Pump body cover plate; 312. Fuel input pipe; 313. Filter inlet ferrule; 314. Filter; 4. Fuel tank; Detailed implementation manners

[0033] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine with the embodiments to detail the present invention.

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0038] As Figures 1-5As shown in the figure, the present invention provides a broad-spectrum fuel cell fuel feeding system, including a fuel feeder 1; the fuel feeder 1 has a fuel output pipe 11, an injector 12 and a fuel collector 13, and the fuel output pipe 11 is connected to the fuel collector 13 through the injector 12; the fuel collector 13 is connected to a fuel conduit 2; the other end of the fuel conduit 2 is connected to a fuel output pipe 31 on a pump body assembly 3; the pump body assembly 3 has a fuel output pipe 31, a pressure relief valve outlet ferrule 32, a pressure relief valve 33, a pressure relief valve inlet ferrule 34, a pump-out through-plate pipe 35, a pump-out ferrule 36, a pump-out pipeline 37, a fuel pump 38, a pump-in pipeline 39, a pump-in ferrule 310, a pump body cover plate 311, a fuel input pipe 312, a filter inlet ferrule 313, and a filter 314; the filter 314 is connected to the fuel input pipe 312 through the filter inlet ferrule 313; the fuel input pipe 312 passes through the pump body cover plate 311 and is connected to the pump-in ferrule 310; the pump-in ferrule 310 is connected to the fuel pump 38 through the pump-in pipeline 39; the fuel pump 38 is connected to the pump-out ferrule 36 through the pump-out pipeline 37; the pump-out ferrule 36 is connected to the pressure relief valve inlet ferrule 34 through the pump-out through-plate pipe 35; the pressure relief valve inlet ferrule 34 is connected to the pressure relief valve 33; the pressure relief valve 33 is connected to the fuel output pipe through the pressure relief valve outlet ferrule 32; the pump body cover plate 311 in the pump body assembly 3 is connected to a fuel tank 4 through bolts;

[0039] Optionally, the materials of the fuel output pipe 11 and the fuel collector 13 can be corrosion-resistant stainless steel, such as 304L and 316L.

[0040] Optionally, the pressure and flow rate of the injector 12 can be selected and matched.

[0041] Optionally, the fuel feeder 1 can be a multi-channel fuel feeder, not limited to the figure shown.

[0042] Optionally, the fuel conduit 2 is made of corrosion-resistant material, which can be a flexible pipe or a rigid pipe.

[0043] Optionally, the materials of the fuel output pipe 31, the pressure relief valve outlet ferrule 32, the pressure relief valve inlet ferrule 34, the pump-out through-plate pipe 35, the pump-out ferrule 36, the pump-out pipeline 37, the pump-in pipeline 39, the pump-in ferrule 310, the pump body cover plate 311, the fuel input pipe 312, the filter inlet ferrule 313, and the filter 314 in the pump body assembly 3 can be corrosion-resistant stainless steel, such as 304L and 316L.

[0044] Optionally, the pressure of the pressure relief valve 33 can be adjusted and selected, and it is commonly 300 - 500 kPa.

[0045] Optionally, the fuel pump 38 needs to be corrosion-resistant, and a metal gear pump is preferred.

[0046] Optionally, the filtration accuracy of the filter 314 is selected according to the requirements of the fuel pump 38 and the injector 12, and is commonly 200 to 600 mesh.

[0047] Optionally, the broad-spectrum fuel includes methanol, ethanol, gasoline, diesel, kerosene, fuel oil, dimethyl ether, biomass, etc.

[0048] The present invention also provides a working method for a broad-spectrum fuel cell fuel feeding system, which is realized based on a broad-spectrum fuel cell fuel feeding system, and includes the following steps: In the system filling and exhaust stage, fuel is injected into the fuel tank 4, and the fuel pump 38 is turned on. At this time, the gas in the pipeline is discharged from the overflow port of the pressure relief valve 33. In the system spray start-up stage, it is controlled according to the fuel quantity required for system start-up and the relationship between the opening frequency and flow rate of the injector 12 that has been calibrated in advance. After the start-up is completed, the injector 12 is turned off. In the system operation stage, another injector 12 is turned on, and it is controlled and adjusted according to the relationship between the system discharge current and the required fuel quantity and the relationship between the opening frequency and flow rate of the injector 12 that has been calibrated in advance. In the system shutdown stage, the injector 12 is first turned off, and then the fuel pump 38 is turned off.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A broad-spectrum fuel cell fuel feeding system, characterized in that: it includes a fuel feeder, a fuel conduit, a pump assembly and a fuel tank; the fuel feeder includes a fuel output pipe, an injector and a fuel collector, the fuel output pipe is connected to the fuel collector through the injector, the fuel collector is connected to one end of the fuel conduit, and the other end of the fuel conduit is connected to one end of the fuel output pipe on the pump assembly; the pump assembly includes a fuel output pipe, a pressure relief valve, a pump-out through-plate pipe, a pump body cover plate, a pump-out pipeline, a fuel pump, a pump-in pipeline, a fuel input pipe and a filter, the other end of the fuel output pipe is connected to the pressure relief valve, the pressure relief valve is connected to the lower end of the pump-out through-plate pipe, the pump-out through-plate pipe passes through the pump body cover plate, the upper end of the pump-out through-plate pipe is connected to one end of the pump-out pipeline, the other end of the pump-out pipeline is connected to the fuel pump, the fuel pump is connected to one end of the pump-in pipeline, the other end of the pump-in pipeline is connected to the upper end of the fuel input pipe, the fuel input pipe passes through the pump body cover plate, the lower end of the fuel input pipe is connected to the filter, and the pump assembly is connected to the fuel tank by bolts; a broad-spectrum fuel is provided in the fuel tank.

2. The broad-spectrum fuel cell fuel feeding system according to claim 1, characterized in that, the fuel output pipe is connected to the pressure relief valve through a pressure relief valve outlet ferrule, the pressure relief valve is connected to the pump-out through-plate pipe through a pressure relief valve inlet ferrule, the upper end of the pump-out through-plate pipe is connected to the pump-out pipeline through a pump-out ferrule, the other end of the pump-in pipeline is connected to the upper end of the fuel input pipe through a pump-in ferrule, and the lower end of the fuel input pipe is connected to the filter through a filter inlet ferrule.

3. The broad-spectrum fuel cell fuel feeding system according to claim 1, characterized in that, the materials of the fuel output pipe and the fuel collector are 304L stainless steel or 316L stainless steel.

4. The broad-spectrum fuel cell fuel feeding system according to claim 1, characterized in that, the fuel feeder is single-way or multi-way fuel feeding.

5. The broad-spectrum fuel cell fuel feeding system according to claim 1, characterized in that, the fuel conduit is a corrosion-resistant pipe, and the fuel conduit is a flexible pipe or a rigid pipe.

6. The broad-spectrum fuel cell fuel feeding system according to claim 1, characterized in that, the materials of the fuel output pipe, the pressure relief valve outlet ferrule, the pressure relief valve inlet ferrule, the pump-out through-plate pipe, the pump-out ferrule, the pump-out pipeline, the pump-in pipeline, the pump-in ferrule, the pump body cover plate, the fuel input pipe, the filter inlet ferrule and the filter are 304L stainless steel or 316L stainless steel.

7. The broad-spectrum fuel cell fuel feeding system according to claim 1, characterized in that, the pressure range of the pressure relief valve is 300 - 500 kPa, and the filtration precision range of the filter is 200 - 600 meshes.

8. The broad-spectrum fuel cell fuel feeding system according to claim 1, characterized in that, the fuel pump is a metal gear pump.

9. The broad-spectrum fuel cell fuel feeding system according to claim 1, characterized in that, the broad-spectrum fuel includes methanol, ethanol, gasoline, diesel, kerosene, fuel oil, dimethyl ether and biomass.

10. A working method of a fuel feeding system for a wide-spectrum fuel cell, which is implemented based on the wide-spectrum fuel cell fuel feeding system described in any one of claims 1-9, characterized in that, it includes the following steps: During the system filling and exhaust stage, fuel is injected into the fuel tank and the fuel pump is turned on. At this time, the gas in the pipeline is discharged from the overflow port of the pressure relief valve; During the system spray start-up stage, control is carried out according to the fuel quantity required for system start-up and the relationship between the opening frequency and flow rate of the injector that has been calibrated in advance. When the start-up is completed, the injector is closed; During the system operation stage, another injector is turned on, and control and adjustment are carried out according to the relationship between the system discharge current and the required fuel quantity and the relationship between the opening frequency and flow rate of the injector that has been calibrated in advance; During the system shutdown stage, first close the injector, and then close the fuel pump.

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