CN100511792C - Integrated fuel cell for optimization design for hydrogen gas access channels and circulating uses - Google Patents

Abstract

The present invention provides an integrated fuel cell with optimized design for hydrogen inlet and outlet passages and recycling, which is characterized in that the total hydrogen inlet passage is a smooth pipe, which is horizontally arranged on the outside of a collector end panel or in the middle of the collector In the panel, a plurality of branch hydrogen channels branched from the side of the main hydrogen inlet channel are respectively connected to the branch hydrogen inlets of each fuel cell stack module; the outgoing hydrogen channels of each fuel cell stack module are directly connected to the other collector end panel. Or lead out from the middle panel of the current collection; the hydrogen recycling device is provided with a combined solenoid valve, and the inlets of each single valve in the combined solenoid valve are respectively connected to the outgoing hydrogen channels of each fuel cell stack module. By adopting the technology of the present invention, it is possible to prevent condensed water from accumulating in the general inlet hydrogen channel, and all the excess hydrogen can be taken out of the fuel cell in time, and it also has the beneficial effects of energy saving, noise reduction and less space occupation.

Description

An integrated fuel cell with optimized design for hydrogen inlet and outlet channels and recycling

technical field

The invention relates to a fuel cell, in particular to an integrated fuel cell with an optimized design for hydrogen inlet and outlet passages and recycling.

Background technique

A fuel cell is a device that converts the chemical energy generated during the electrochemical reaction of fuel and oxidant into electrical energy. The core component of the device is the membrane electrode (Membrane Electrode Assembly, referred to as MEA). The membrane electrode consists of a proton exchange membrane and two conductive porous diffusion materials (such as carbon paper) sandwiched on both sides of the membrane. A finely dispersed catalyst (such as metal platinum) that can initiate an electrochemical reaction is evenly distributed on the two boundary surfaces that are in contact with the conductive material. On both sides of the membrane electrode, the electrons generated during the electrochemical reaction are drawn out through the external circuit with conductive objects, forming a current loop.

At the anode end of the membrane electrode, the fuel can permeate through the porous diffusion material (such as carbon paper), and an electrochemical reaction occurs on the surface of the catalyst, losing electrons to form positive ions, which can migrate through the proton exchange membrane to reach The other end of the membrane electrode - the cathode end. At the cathode end of the membrane electrode, a gas (such as air) containing an oxidant (such as oxygen) penetrates through a porous diffusion material (such as carbon paper) and undergoes an electrochemical reaction on the surface of the catalyst to obtain electrons to form negative ions. It further combines with positive ions migrated from the anode end to form a reaction product.

In a proton exchange membrane fuel cell using hydrogen as fuel and oxygen-containing air as oxidant (or pure oxygen as oxidant), fuel hydrogen undergoes a catalytic electrochemical reaction in which electrons are lost in the anode region to form hydride ions (protons), Its electrochemical reaction equation is:

Anode reaction: H ₂ → 2H ⁺ +2e

Oxygen undergoes a catalytic electrochemical reaction in the cathode region to obtain electrons to form negative ions, which are further combined with hydrogen positive ions migrated from the anode terminal to form the reaction product water. Its electrochemical reaction equation is:

Cathode reaction: 1/2O ₂ +2H ⁺ +2e→H ₂ O

The proton exchange membrane in the fuel cell is not only used for the electrochemical reaction and the protons generated in the transfer exchange reaction, but also to separate the gas flow containing fuel hydrogen from the gas flow containing oxidant (oxygen) so that they do not Will mix with each other to produce an explosive reaction.

In a typical proton exchange membrane fuel cell, the membrane electrode is generally placed between two conductive plates, and diversion grooves are opened on both plates, so it is also called a diversion plate. The diversion groove is opened on the surface in contact with the membrane electrode, formed by die-casting, stamping or mechanical milling, and its number is more than one. The guide plate can be made of metal material or graphite material. The function of the diversion groove on the diversion plate is to introduce fuel or oxidant into the anode area or cathode area on both sides of the membrane electrode respectively. In the structure of a single proton exchange membrane fuel cell, there is only one membrane electrode and two guide plates, and the two guide plates are arranged on both sides of the membrane electrode, one is used as the guide plate for the anode fuel, and the other As a guide plate for cathode oxidant. These two guide plates are not only used as current collector plates, but also as mechanical support on both sides of the membrane electrode. The diversion groove on the diversion plate is not only a channel for fuel or oxidant to enter the surface of the anode or cathode, but also a water outlet channel to take away the water generated during the operation of the battery.

In order to increase the power of a proton exchange membrane fuel cell, two or more single cells are usually connected together in a straight stacked or tiled manner to form a cell group, or called a cell stack. Such a battery pack is usually fastened together by a front end plate, a rear end plate and a pull rod to form a whole. In the battery pack, the two sides of the pole plate between the two proton exchange membranes are provided with diversion grooves, which are called bipolar plates. One side of the bipolar plate is used as the anode flow guide surface of one membrane electrode, and the other side is used as the cathode flow guide surface of another adjacent membrane electrode. A typical battery pack usually also includes: 1), inlets and diversion channels for fuel and oxidant gases. Its function is to evenly distribute fuel (such as hydrogen, methanol, or hydrogen-rich gas obtained by reforming methanol, natural gas, and gasoline) and oxidant (mainly oxygen or air) into the diversion grooves on each anode and cathode surface ; 2), the inlet, outlet and diversion channel of cooling fluid (such as water). Its function is to evenly distribute the cooling fluid to the cooling channels in each battery pack, absorb the reaction heat generated in the fuel cell and take it out of the battery pack for heat dissipation; 3), the outlet and guide channel of fuel and oxidant gas . Its function is to discharge the excess fuel gas and oxidant that did not participate in the reaction, and at the same time take out the liquid or gaseous water generated by the reaction. The above-mentioned fuel inlet and outlet, oxidant inlet and outlet and cooling fluid inlet and outlet are usually set on one end plate of the fuel cell stack or respectively set on two end plates.

The proton exchange membrane fuel cell can be used as the power system of vehicles, ships and other vehicles, and can also be made into mobile or fixed power generation devices.

When the proton exchange membrane fuel cell is used as a power system of a vehicle or a ship and a mobile or fixed power generation device, it must include a battery stack, a fuel hydrogen supply subsystem, an air supply subsystem, a cooling and heat dissipation subsystem, an automatic control mechanism and Various parts of the power output mechanism.

Figure 1 is a schematic diagram of the basic components of a fuel cell power generation system. In the figure, 1 is a fuel cell stack, 2 is a hydrogen storage bottle or other hydrogen storage device, 3 is a pressure reducing valve, 4 is an air filter device, 5 is an air compression supply device, 6, 6' are water-steam separators , 7 is a water tank, 8 is a cooling fluid circulation pump, 9 is a radiator, 10 is a hydrogen circulation pump, 11 and 12 are humidifying devices, and 13 is a hydrogen pressure stabilizing valve.

In order to improve the energy conversion efficiency of the entire fuel cell power generation system, in addition to improving the electrode performance of the fuel cell, it is very important to improve the hydrogen utilization rate of the fuel cell power generation system. Hydrogen supply and recycling play a key role in improving the hydrogen utilization rate of the fuel cell power generation system and ensuring the operation stability of the fuel cell power generation system. After the fuel hydrogen has been decompressed and stabilized, it is transported into the fuel cell stack through the humidification device to react electrochemically with the oxidant on the other side of the electrode. Water is slowly produced on the hydrogen supply side of the electrode as the reaction proceeds. The water mainly comes from two aspects. One is that the humidified hydrogen carries part of the water into the fuel cell stack. After the hydrogen reacts, the water remains; the other part is the water generated by the electrochemical reaction on the cathode side of the electrode through the membrane electrode. Reverse osmosis into the anode side of the electrode. In order to take these two parts of water out of the fuel cell stack from the anode side of the electrode, it is necessary to supply the fuel cell stack with a hydrogen flow rate greater than 1.0 stoichiometric ratio, so that the hydrogen is in excess, and the two parts of the water will be carried by the excess hydrogen when leaving the fuel cell stack. out.

In order to simultaneously recycle excess hydrogen and take out the water on the hydrogen supply side of the electrode in the fuel cell stack, the current technology is to use a hydrogen circulation pump or a hydrogen circulation device. As shown in FIG. 1 , a water vapor separator 6 is arranged on the hydrogen outlet pipeline, and a hydrogen circulation pump 10 is arranged between the water vapor separator 6 and the hydrogen inlet pipeline. The excess hydrogen is recovered by the hydrogen circulation pump, and re-enters the fuel cell stack to participate in the reaction, and at the same time, the above-mentioned two parts of water can be taken out of the fuel cell stack. For example, the patented technology "a fuel cell hydrogen recycling device suitable for low-voltage operation", the Chinese patent number is 03255444.3.

The hydrogen recycling technology mentioned above is more suitable for a single fuel cell stack. However, when applied to large fuel cell stacks composed of multiple single fuel cell stack modules integrated in an integrated manner, problems arise.

In fact, the current fuel cell power generation system is used as a power system of a vehicle or as a power station, which requires a high power output. This high power output requires that the fuel cell stack must achieve high voltage and high current output. In order to realize a high-power fuel cell stack, it is necessary to integrate multiple single fuel cell stack modules to form a relatively compact large fuel cell stack. For example, the method of "US Patent5486430" arranges multiple single fuel cell stacks in parallel, and integrates all air, hydrogen, and cooling water inlets and outlets of each single fuel cell stack into a common front panel or rear panel. . The front panel and the rear panel are provided with six fluid passages shared by the inlets and outlets of all air, hydrogen, and cooling fluids on all single fuel cell stacks. Another example is the method described in the patent "An Integrated Fuel Cell (Patent No.: 02265512.3)" of Shanghai Shenli Technology Co., Ltd., a plurality of fuel cell stacks share a collector panel, and the front and rear panels on the collector panel Multiple fuel cell stacks are integrated. The collector panel is arranged in the middle of multiple fuel cell stacks, and the inlets and outlets of air, hydrogen, and cooling fluid of all fuel cell stacks are uniformly integrated on this common collector panel. The collecting panel is provided with six common fluid passages for the inlets and outlets of all air, hydrogen, and cooling fluids on all fuel cell stacks.

For the above-mentioned integrated fuel cells realized by various methods, although each fuel cell stack module shares each fluid channel, each module has its own positive and negative current collector motherboards. , Negative motherboards are connected in series and in parallel, and the entire integrated fuel cell can output high voltage and high current requirements that meet actual needs.

For a fuel cell power generation system with a higher power output, in principle, it is possible to integrate more fuel cell stack modules, and let all the air, hydrogen, and cooling fluid inlets and outlets on all fuel cell stack modules share six fluid channels , that is, the integrated large fuel cell stack is also an integrated structure with six fluid channels for total air, total hydrogen, and total cooling fluid inlets and outlets.

In order to make the integrated fuel cell have higher volume, weight, and power density, the most compact engineering design must be carried out on the integrated fuel cell front-end collector panel, rear-end collector panel or intermediate total collector panel, for example: US Patent 6159629, for an integrated fuel cell front-end collector panel and rear-end collector panel, a diversion layer structure manifold design is adopted, as shown in Figure 2, Figure 3, and Figure 4.

The diversion level manifold design technology on the above-mentioned integrated fuel cell manifold panel allows all the inlets and outlets of air, hydrogen, and cooling fluid on each fuel cell stack module in the integrated fuel cell to share six fluid channels. A total fluid channel constitutes a layer inside the collector panel, and each layer has a separate guide pipe outlet to form six fluid ports for the total air, total hydrogen, and total cooling fluid inlet and outlet of the integrated fuel cell.

Although the above-mentioned technology enables the integrated fuel cell to achieve a compact size and greatly improve the volume power density in terms of design, it will have the following technical defects when hydrogen fuel is recycled:

1. Each fluid first enters from the main fluid inlet of the integrated fuel cell manifold panel, fills one layer first, and then distributes to each fuel cell module. In order to increase the volumetric power density of the integrated fuel cell, the overall level formed by the main inlet fluid channel is often relatively narrow, and the branch inlet fluid ports of each fuel cell module do not completely occupy the area of the entire level, but only occupy the entire level. A small part of the layer (as shown in Figure 3, Figure 4, and Figure 5). When the inlet fluid is a single-phase fluid, such as cooling fluid—water, the inlet fluid channel of the entire narrow layer is completely filled by the fluid, and then enters evenly from each inlet fluid port of each fuel cell module, and no what is the problem. However, when the fluid is in a two-phase flow state composed of most of the gas and a small amount of liquid, the gas-phase fluid can easily fill the general inlet fluid channel at the entire narrow layer level, and can evenly enter the inlet fluid at each inlet fluid port of each fuel cell module. , and a small amount of liquid fluid (often condensed water) will accumulate in the general inlet fluid channel at the narrow layer level, and when accumulated in a large amount, it will often lead to random allocation to a certain fuel cell module, resulting in the conduction of gas phase flow. Launder filled with liquid water and clogged.

The above situation often occurs in the total inlet hydrogen channel in the integrated fuel cell. Due to the change of flow rate and temperature, the humidified hydrogen condenses a small part of liquid water. After accumulating a lot of water for a long time, it is easy to flow with the hydrogen and Cause water blockage in the hydrogen guide groove in one or several single cells in each fuel cell module. Blockage of water in the hydrogen diversion tank of a single cell will cause the fuel hydrogen of the single cell to be starved, the voltage will drop sharply, and the electrode will be burned out in severe cases.

2. When hydrogen recycling devices such as hydrogen circulation pumps are used, in order to bring out the water on the hydrogen side of each fuel cell stack module in the entire integrated fuel cell stack, a hydrogen circulation pump or hydrogen circulation with a large circulation flow rate must be used Using the device, such a device with a large total circulating hydrogen flow rate consumes a lot of power, which reduces the power generation efficiency of the entire fuel cell power generation system, that is, the conversion efficiency of fuel hydrogen. Moreover, such a device with a large total circulating hydrogen flow rate often occupies a large volume space in the entire fuel cell power generation system, increases weight, and often has relatively high noise.

Contents of the invention

The object of the present invention is to provide an integrated fuel cell with an optimized design for hydrogen inlet and outlet passages and recycling in order to solve the above problems, which can prevent condensed water from accumulating in the total hydrogen inlet passage.

The object of the present invention is achieved in this way: an integrated fuel cell optimized for hydrogen inlet and outlet channels and recycling, including an integrated fuel cell stack and a hydrogen recycling device composed of at least two fuel cell stack modules, integrated Both ends of the integrated fuel cell stack are provided with collector end panels, or a collector middle panel is provided in the middle of the integrated fuel cell stack, and a total inlet hydrogen gas is provided on a collector end panel or in the collector middle panel. Channels, each fuel cell stack module is respectively provided with a branch hydrogen channel and an outgoing hydrogen channel. The hydrogen recycling device includes a hydrogen circulation pump and a water vapor separator. Its characteristics are:

The general inlet hydrogen channel is a smooth pipe, which is horizontally arranged on the outside of a collector end panel or in the collector middle panel, and a plurality of branch hydrogen inlet channels are branched from the side of the total inlet hydrogen channel to connect with each fuel cell stack respectively. The hydrogen inlet of the module is connected;

The outlet hydrogen channels of each of the fuel cell stack modules are respectively directly drawn from another collector end panel or collector middle panel;

The hydrogen recycling device also includes a combination solenoid valve, the inlets of each single valve in the combination solenoid valve are respectively connected to the outgoing hydrogen passages of each fuel cell stack module, and the outlets of each single valve in the combination solenoid valve are respectively connected through a main pipe and The water vapor separator is connected.

The effective diameter of each branch hydrogen inlet channel is smaller than the effective diameter of the main hydrogen inlet channel.

Each of the single valves in the combined solenoid valve can be conducted sequentially to realize intermittent and pulsed hydrogen fuel circulation of each fuel cell stack module.

The integrated fuel cell stack is composed of six fuel cell stack modules, and the combined solenoid valve in the corresponding hydrogen recycling device is composed of six single solenoid valves.

The integrated fuel cell stack is composed of three fuel cell stack modules, and the combined solenoid valve in the corresponding hydrogen recycling device is composed of three single solenoid valves.

The integrated fuel cell stack is composed of eight fuel cell stack modules, and the combined solenoid valve in the corresponding hydrogen recycling device is composed of eight single solenoid valves.

The integrated fuel cell stack is composed of ten fuel cell stack modules, and the combined solenoid valve in the corresponding hydrogen recycling device is composed of ten single solenoid valves.

Compared with the prior art, the integrated fuel cell of the present invention has the following advantages and positive effects due to the adoption of the above-mentioned technical scheme for the hydrogen inlet and outlet channels and the optimized design of recycling:

1. Fuel hydrogen first flows into a smooth and regular general hydrogen inlet channel in the collector end panel or the collector middle panel, and this smooth and regular total hydrogen inlet channel is then divided into several outlets to feed the branch hydrogen in each fuel cell module. The connected branch hydrogen channels, because the effective diameter of each branch hydrogen channel is smaller than the main hydrogen channel, so that when the humidified hydrogen enters the main hydrogen channel, it is then shunted to each fuel cell through the branch hydrogen channels When the module is installed, even the condensed water produced at the beginning cannot accumulate in the total inlet hydrogen channel, and all the excess hydrogen can be taken out of the fuel cell in time.

2. Due to the optimized design of the hydrogen recycling device, a combined solenoid valve is added, and each single valve in the combined solenoid valve is directly connected to each outgoing hydrogen channel, and the intermittent, To circulate the hydrogen fuel of each fuel cell stack module in a pulsed manner, only a hydrogen circulation pump with a small hydrogen circulation flow rate is needed, and the water on the hydrogen side of each fuel cell stack module can be brought out more easily. In addition, due to the use of a hydrogen circulation pump with a relatively small hydrogen circulation flow rate, it also has the beneficial effects of energy saving, noise reduction and less space occupation.

Description of drawings

The purpose, specific structural features and advantages of the present invention can be further understood through the following description of an embodiment of the integrated fuel cell with optimized design of the hydrogen inlet and outlet channels and recycling of the present invention in conjunction with the accompanying drawings. Among them, the attached figure is:

FIG. 1 is a schematic diagram of the basic composition of a fuel cell power generation system in the prior art;

Fig. 2, Fig. 3 and Fig. 4 are the schematic diagrams of adopting the manifold design for the diversion layer structure of the collector end panel in the prior art;

Fig. 5 is an integrated fuel cell stack in which the hydrogen inlet and outlet passages are optimally designed in the present invention;

Fig. 6 is another integrated fuel cell stack in which the hydrogen inlet and outlet passages have been optimally designed in the present invention;

7 is a schematic diagram of the main components of a hydrogen recycling device optimized for hydrogen recycling in the present invention;

Fig. 8 is a schematic diagram of the basic composition of an embodiment of the present invention.

Detailed ways

See Figure 5, Figure 6, Figure 7. The present invention optimizes the design of the integrated fuel cell for hydrogen inlet and outlet passages and recycling, including an integrated fuel cell stack 1 (as shown in Figures 5 and 6) composed of at least two fuel cell stack modules and a hydrogen recycling device ( As shown in Figure 7), collector end panels 101, 102 (as shown in Figure 5) are respectively provided at both ends of the integrated fuel cell stack 1, or a collector middle panel is provided in the middle of the integrated fuel cell stack 103 (as shown in Figure 6), on the outside of a collector end panel (as shown in Figure 5) or in the collector middle panel 103 (as shown in Figure 6) is provided with a total inlet hydrogen passage 104 , from the side of the main hydrogen inlet channel, a plurality of branch hydrogen gas channels 104a, 104b... are respectively communicated with the hydrogen gas inlets of each fuel cell stack module, and the outgoing hydrogen gas channels 105a, 105b of each fuel cell stack module. .....respectively lead directly from another collector end panel (such as 102) or the collector middle panel 103, and the effective diameter of each branch hydrogen inlet channel is smaller than the effective diameter of the main hydrogen inlet channel.

The hydrogen recycling device (referring to Fig. 7) comprises a hydrogen circulation pump 10, a water vapor separator 6 and a combination solenoid valve 14, the inlets of each single valve in the combination solenoid valve are respectively connected to the outlet hydrogen passages of each fuel cell stack module, and the combined solenoid valve The outlet of each single valve communicates with the steam separator through a main pipe respectively. The single valves in the combined solenoid valve can be conducted sequentially respectively to realize the intermittent and pulsed hydrogen fuel circulation of each fuel cell stack module.

The main structural composition and working principle of an integrated fuel cell with optimized design for hydrogen inlet and outlet passages and recycling utilization of the present invention can be further illustrated by the following examples:

Please refer to Fig. 8, an integrated fuel cell stack 1 in an embodiment of an integrated fuel cell optimized for the design of hydrogen inlet and outlet passages and recycling of the present invention includes six fuel cell stack modules, and the corresponding hydrogen recycling device A combination solenoid valve 14 consisting of six single solenoid valves is provided. The six fuel cell stack modules share a collector middle panel 103 . The humidified fuel hydrogen flows in from a circular main hydrogen inlet channel 104 on the upper part of the collector middle panel, and then splits out six branch hydrogen gas inlet channels 104a, 104b, 104c......, distribute the humidified fuel hydrogen evenly to the branch hydrogen channels of the six fuel cell stack modules; the outgoing hydrogen channels 105a, 105b, 105c of each fuel cell stack module... ., are respectively directly drawn out from the collecting middle plate 104, and connected with the inlets of each single valve in the combined solenoid valve 14 in one-to-one correspondence. Among other symbols in the figure, 2 is a hydrogen storage bottle or other hydrogen storage devices, 3 is a pressure reducing valve, 6 is a water-steam separator, 10 is a hydrogen circulation pump, 11 is a humidifying device, and 13 is a hydrogen pressure stabilizing valve.

The rated output power of the integrated fuel cell is 70 kW, and the hydrogen supply is about 900 standard liters per minute. When operating at a hydrogen metering ratio of 1.2, about 180 standard liters per minute of excess hydrogen needs to be circulated back through the hydrogen circulation pump. If the technical scheme of the invention is not adopted, a hydrogen diaphragm pump with a large circulation flow rate of 180 liters/minute is required to meet the requirement of its circulation volume. The pump consumes 600 watts, is as loud as 80 decibels and weighs 15 kilograms. Since each fuel cell stack module adopts a unified general inlet hydrogen channel and a total hydrogen outlet channel, when the hydrogen circulation flow rate reaches 180 liters/minute, the average hydrogen circulation flow rate of each fuel cell stack module is only 30 liters/minute. It is often not possible to guarantee the carryover of hydrogen-side water in each fuel cell stack module.

After adopting the above-mentioned technical scheme of the present invention, only one hydrogen diaphragm pump with a medium circulation flow rate of 90 liters/minute is needed to meet the requirement of its circulation volume. The pump consumes only 250 watts, is only 60 decibels quiet, and weighs only 3 kilograms.

When the rated output power of the integrated fuel cell is 70 kWh, the hydrogen supply is about 900 liters per minute, and it operates at a hydrogen metering ratio of 1.1, of which only 90 liters per minute of excess hydrogen is circulated back through the hydrogen circulation pump. Due to the adoption of the technical solution of the present invention, the integrated fuel cell stack is composed of six fuel cell stack modules, and the outlet hydrogen channels of each module are respectively drawn from the middle panel of the current collector, and combined with six single solenoid valves in the combined solenoid valve. The valves are connected separately. The combined solenoid valve only opens one solenoid valve at any time, so that only the hydrogen gas from the hydrogen outlet of one fuel cell stack module enters the circulation, so the hydrogen circulation flow rate of each fuel cell stack module is as high as 90 liters per minute. Under the action of the hydrogen circulation flow, the hydrogen-side water in the module is easily taken out of the fuel cell stack.

The individual valves in the combined solenoid valve are opened sequentially in a fixed sequence, causing the hydrogen circulation of each fuel cell stack module to be intermittent and pulsed. The actual operation proves that this optimally designed hydrogen recycling device enables each The fuel cell stack drains are cleaner. And it has the advantages of energy saving and noise reduction.

The integrated fuel cell stack in the integrated fuel cell of the present invention that optimizes the design of the hydrogen inlet and outlet channels and recycling can be composed of more than two fuel cell stack modules, such as 3, 8, 10, etc., correspondingly The combined solenoid valve in the hydrogen recycling device is also composed of more than two single solenoid valves, such as 3, 8, 10 and so on.

Claims (7)

1. integral type fuel battery to hydrogen access way and recycling optimal design, comprise integrated fuel cell pile and the hydrogen recycle use device formed by at least two fuel battery stack modules, two ends at integrated fuel cell pile respectively are provided with the afflux end plates, or be provided with the afflux centre panel in the centre of integrated fuel cell pile, on afflux end plates or in the afflux centre panel, be provided with and always advance the hydrogen passage, each fuel battery stack module is respectively equipped with and props up hydrogen passage and expenditure hydrogen passage, the hydrogen recycle use device comprises hydrogen circulating pump and steam trap, it is characterized in that:

Described always to advance the hydrogen passage be a level and smooth pipeline, and it is horizontally set in the outside or afflux centre panel of afflux end plates, distributes a plurality of and advance the hydrogen passage and link to each other with a hydrogen inlet of each fuel battery stack module respectively by always entering hydrogen passage side;

The expenditure hydrogen passage of described each fuel battery stack module is directly drawn from another afflux end plates or afflux centre panel respectively;

Described hydrogen recycle use device also comprises a multifunctional electromagnetic valves, the import of each single valve is communicated with the expenditure hydrogen passage of each fuel battery stack module respectively in the multifunctional electromagnetic valves, and the outlet of each single valve is communicated with steam trap by a house steward respectively in the multifunctional electromagnetic valves.

2. the integral type fuel battery to hydrogen access way and recycling optimal design as claimed in claim 1 is characterized in that: described each advance the effective drift diameter of hydrogen passage less than the effective drift diameter that always advances the hydrogen passage.

3. the integral type fuel battery to hydrogen access way and recycling optimal design as claimed in claim 1, it is characterized in that: each single valve in the described multifunctional electromagnetic valves can be distinguished conducting successively, realizes that the hydrogen fuel to each fuel battery stack module of batch (-type), pulsed circulates.

4. the integral type fuel battery to hydrogen access way and recycling optimal design as claimed in claim 1, it is characterized in that: described integrated fuel cell pile is made up of six fuel battery stack modules, and the multifunctional electromagnetic valves in the corresponding hydrogen recycle use device is combined by six single electromagnetically operated valves.

5. the integral type fuel battery to hydrogen access way and recycling optimal design as claimed in claim 1, it is characterized in that: described integrated fuel cell pile is made up of three fuel battery stack modules, and the multifunctional electromagnetic valves in the corresponding hydrogen recycle use device is combined by three single electromagnetically operated valves.

6. the integral type fuel battery to hydrogen access way and recycling optimal design as claimed in claim 1, it is characterized in that: described integrated fuel cell pile is made up of eight fuel battery stack modules, and the multifunctional electromagnetic valves in the corresponding hydrogen recycle use device is combined by eight single electromagnetically operated valves.

7. the integral type fuel battery to hydrogen access way and recycling optimal design as claimed in claim 1, it is characterized in that: described integrated fuel cell pile is made up of ten fuel battery stack modules, and the multifunctional electromagnetic valves in the corresponding hydrogen recycle use device is combined by ten single electromagnetically operated valves.

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