CN212646933U - Air cooling galvanic pile activation test platform - Google Patents
Air cooling galvanic pile activation test platform Download PDFInfo
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- CN212646933U CN212646933U CN202021422188.6U CN202021422188U CN212646933U CN 212646933 U CN212646933 U CN 212646933U CN 202021422188 U CN202021422188 U CN 202021422188U CN 212646933 U CN212646933 U CN 212646933U
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Abstract
The utility model relates to a galvanic pile test technical field particularly, relates to an air cooling galvanic pile activation test platform. An air-cooling galvanic pile activation test platform comprises a conventional air-cooling galvanic pile test platform and an air humidifying unit. The air humidifying unit is used for conveying water mist to the air-cooled electric pile to be tested. This air cooling pile activation test platform can improve the content of moisture in the normal atmospheric temperature air among the entering air cooling pile, can avoid the air cooling pile overtemperature with the help of the liquid corpuscle gasification in the water smoke in the heat in the pile again to reduce the degree of difficulty of the activation of air cooling pile, shorten the activation time of air cooling pile, and make the air cooling pile reach better performance.
Description
Technical Field
The utility model relates to a galvanic pile test technical field particularly, relates to an air cooling galvanic pile activation test platform.
Background
A fuel cell is a power generation device that directly converts chemical energy in a fuel and an oxidant into electrical energy. The fuel cell has the advantages of high efficiency, environmental protection, safety, reliability, low noise and the like, and has very wide market prospect in the fields of transportation, distributed power generation, portable power generation and the like.
The water-cooled galvanic pile test bench is generally provided with a humidifying device for hydrogen and air, the hydrogen and the air can be humidified to reach the relative humidity of about 100% at the running temperature of the galvanic pile, and under the action of the high relative humidity reaction gas, the galvanic pile can generate water in the power generation running process, so that the membrane electrode is ensured not to lack water in the activation process, and the effect of wetting as soon as possible is achieved. Meanwhile, because the electric pile is cooled by the cooling liquid, the temperature of the electric pile can be effectively controlled, and the over-temperature condition can not occur.
Because the air flow field of the open cathode type air-cooled galvanic pile is open, air in the environment is directly sucked into the galvanic pile through the fan arranged on the galvanic pile, and the air cannot be sent into the galvanic pile through a pipeline after being humidified by a humidifier like a water-cooled galvanic pile test bench, so that the relative humidity of the air entering the air-cooled galvanic pile cannot be controlled.
In this case, even if the air in the test environment reaches 100% relative humidity, since the temperature at which the stack operates is several tens of degrees higher than the ambient temperature, the relative humidity of the air in the stack is still low at the operating temperature of the stack, which is not favorable for humidification of the proton exchange membrane and the proton exchange resin in the catalyst layer.
Meanwhile, because the open cathode type air-cooled galvanic pile has no cooling liquid flow field, the heat generated by the galvanic pile can be taken away only through excessive air, and the temperature of the galvanic pile is controlled. The air has the functions of both reaction and cooling, but because the heat capacity of the air is small, in order to control the temperature of the electric pile, a large amount of air needs to be introduced into the electric pile, the excess ratio of the air is large, the air entering the air-cooled electric pile cannot be humidified like the air entering the water-cooled electric pile, and water generated by the fuel cell is basically taken away by the excess air, so that the air-cooled electric pile is difficult to activate and has poor effect.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an air cooling pile activation test platform, it can improve the content that gets into moisture in the air cooling pile normal atmospheric temperature air, can absorb the heat in the pile with the help of the liquid corpuscle gasification process in the water smoke again, and then can avoid the pile overtemperature to solve the not good problem of conventional air cooling pile testboard activation air cooling pile effect, and improve the activation effect of air cooling pile, shorten the activation time of air cooling pile.
The embodiment of the utility model is realized like this:
in a first aspect, an embodiment of the present invention provides
An air-cooled galvanic pile activation test platform comprises a conventional air-cooled galvanic pile test platform and an air humidifying unit;
the air humidifying unit is used for conveying water mist to the air-cooled electric pile to be tested.
In an alternative embodiment, the air-cooled electric pile activation testing platform further comprises an air supply unit;
the air supply unit is used for sending the water mist generated by the air humidifying unit and the outside air into the air-cooled electric pile.
In an alternative embodiment, the air humidification unit includes a low temperature water mist generator.
In an alternative embodiment, the air humidification unit further comprises a water replenishment circuit for replenishing the low temperature mist generator with water.
In an alternative embodiment, the low temperature water mist generator comprises a water storage tank and a liquid level meter arranged in the water storage tank; the water replenishing loop is communicated with the water storage tank;
the air humidifying unit further comprises an electromagnetic valve arranged in the water replenishing loop, and the electromagnetic valve is used for communicating the water replenishing loop with the water storage tank when the liquid level in the water storage tank is lower than a preset liquid level.
In an optional embodiment, the air-cooled galvanic pile activation test platform further comprises an electric control unit, and the electric control unit is electrically connected with the air humidifying unit;
the electric control unit is used for receiving the liquid level signal output by the air humidifying unit and controlling the electromagnetic valve to conduct the water replenishing loop and the water storage tank when the liquid level represented by the liquid level signal is lower than a preset liquid level.
In an optional embodiment, the electronic control unit is used for controlling the start-stop and the working power of the low-temperature water mist generator.
The utility model discloses beneficial effect includes:
the air-cooling galvanic pile activation test platform comprises a conventional air-cooling galvanic pile test platform and an air humidifying unit; the air humidifying unit is used for conveying water mist to the air cooling electric pile. The water mist is conveyed to the air-cooled electric pile through the air humidifying unit, so that the content of moisture in normal-temperature air entering the air-cooled electric pile can be improved. And through the gasification process of water smoke liquid corpuscle, can absorb the heat in the pile, and then avoid the pile overtemperature to solve the not good problem of conventional air cooling pile testboard activation air cooling pile effect, and improve the activation effect of air cooling pile, shorten the activation time of air cooling pile.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an air-cooled electric pile activation test platform in an embodiment of the present invention.
The icon is 200-air cooling galvanic pile activation testing platform; 210-a conventional air-cooling galvanic pile test bench; 211-a hydrogen supply unit; 212-an electronic load unit; 213-an electronic control unit; 214-air cooling the electric pile; 215-an air supply unit; 220-an air humidification unit; 221-low temperature water mist generator; 230-a water replenishing loop; 231-solenoid valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A fuel cell is a power generation device that directly converts chemical energy in a fuel and an oxidant into electrical energy. The fuel cell has the advantages of high efficiency, environmental protection, safety, reliability, low noise and the like, and has very wide market prospect in the fields of transportation, distributed power generation, portable power generation and the like.
The water-cooled galvanic pile test bench is generally provided with a humidifying device for hydrogen and air, the hydrogen and the air can be humidified to reach the relative humidity of about 100% at the running temperature of the galvanic pile, and under the action of the high relative humidity reaction gas, the galvanic pile can generate water in the power generation running process, so that the membrane electrode is ensured not to lack water in the activation process, and the effect of wetting as soon as possible is achieved. Meanwhile, because the electric pile is cooled by the cooling liquid, the temperature of the electric pile can be effectively controlled, and the over-temperature condition can not occur.
Because the air flow field of the open cathode type air-cooled galvanic pile is open, air in the environment is directly sucked into the galvanic pile through the fan arranged on the galvanic pile, and the air cannot be sent into the galvanic pile through a pipeline after being humidified by a humidifier like a water-cooled galvanic pile test bench, so that the relative humidity of the air entering the air-cooled galvanic pile cannot be controlled. Even if the air in the test environment reaches 100% relative humidity, the relative humidity of the air in the galvanic pile is still very low at the operating temperature of the galvanic pile because the temperature of the galvanic pile during operation is dozens of degrees higher than the ambient temperature, which is not favorable for the humidification of proton exchange resin in a proton exchange membrane and a catalyst layer.
In this case, assuming that an air-cooled stack has a total of 50 cells, the active area of each cell is 100cm2Current density j is 0.6A cm-2Average voltage V of each unit cell is 0.60V, and ambient temperature TEnvironment(s)At 27 deg.C 300K, electric pileTemperature T ofElectric pile57 ℃ and 330K; meanwhile, it is known that the low enthalpy of reaction of hydrogen and air is 241kJ mol-1Corresponding voltage theory 1.25V, specific heat C of airp＝1kJ kg-1 K-1Then, the heat generated by the stack during the power generating operation is:
qelectric pile＝(VTheory of the invention-V)*j*S*n
＝(1.25V-0.60V)*0.6Acm-2*100cm2*50
＝1950W
＝117kJ min-1
The air flow requirements to carry away this much heat are:
mair (a)＝qElectric pile/[(TElectric pile-TEnvironment(s))*Cp]
＝117kJ min-1/[(330K-300K)*1kJ kg-1 K-1]
＝3.9kg min-1
＝3451.3L min-1
Air metering ratio lambda corresponding to the air flowAir (a)The method comprises the following steps:
λair (a)＝{[0.21*3451.3L min-1/(60s min-1*22.4L mol-1)]/[(50*100cm2*0.6A cm-2)}*(4*96485C mol-1)
＝69.4
It can be seen that if the temperature of the air-cooled stack is controlled not to exceed 57 ℃, the air metering ratio is as high as 69, i.e. the air quantity delivered to the stack is 69 times of the air quantity required by the power generation reaction of the stack.
Assuming that the relative humidity of the air reaches 100% at an ambient temperature of 27 ℃, namely the saturated vapor pressure in the air reaches 3.54 kPa; however, since the temperature of the stack is 57 ℃ and the saturated vapor pressure of water vapor is 17.20kPa at 57 ℃, the relative humidity of air with the relative humidity of 100% at 27 ℃ is only 20.6% (3.54/17.20) after entering the stack at 57 ℃, and thus, the relative humidity of air in the stack is very low, which is not beneficial to the activation of the stack.
If like a water-cooled galvanic pile, firstly, air is humidified to 100% relative humidity in a humidifier at 57 ℃, and then the air is input into the galvanic pile, so that the relative humidity of the air is very proper, and actually, because the heat generated by the galvanic pile can not be effectively discharged, the temperature of the galvanic pile can quickly exceed 57 ℃ and reaches about 87 ℃; thus, the relative humidity of the air in the stack is still low, and due to the stack temperature being so high, the membrane electrodes in the stack are damaged due to over-temperature and over-drying. Therefore, this method is not feasible.
Meanwhile, because the open cathode type air-cooled galvanic pile has no cooling liquid flow field, the heat generated by the galvanic pile can be taken away only through excessive air, and the temperature of the galvanic pile is controlled. The air has the functions of both reaction and cooling, but because the heat capacity of the air is small, in order to control the temperature of the electric pile, a large amount of air needs to be introduced into the electric pile, the excess ratio of the air is large, the air entering the air-cooled electric pile cannot be humidified like the air entering the water-cooled electric pile, and water generated by the fuel cell is basically taken away by the excess air, so that the air-cooled electric pile is difficult to activate and has poor effect.
To solve the above problem, please refer to fig. 1, in which fig. 1 shows a structure of an air-cooled stack activation testing platform according to an embodiment of the present invention; the embodiment provides an air cooling pile activation test platform 200, and it can improve the content of moisture in the normal atmospheric temperature air that gets into in the air cooling pile 214, can absorb the heat in the pile again with the help of the liquid corpuscle gasification process in the water smoke, and then can avoid air cooling pile 214 overtemperature to improve activation effect, shorten activation time.
Specifically, the air-cooled galvanic pile activation test platform 200 comprises a conventional air-cooled galvanic pile test platform 210 and an air humidifying unit 220; the conventional air-cooling stack test stand 210 mainly includes a hydrogen supply unit 211 and an electronic load unit 212; the air humidifying unit 220 is used for delivering water mist to the air-cooled cell stack 214 to be tested.
The working principle of the air-cooling galvanic pile activation testing platform 200 is as follows:
the air-cooled galvanic pile activation test platform 200 comprises a hydrogen supply unit 211, an electronic load unit 212, an electronic control unit 213 and an air humidifying unit 220; the air humidification unit 220 is configured to deliver water mist to the air-cooled stack 214, so as to greatly increase the moisture content in the normal-temperature air entering the air-cooled stack 214. And through the gasification process of the liquid corpuscle in the water smoke, can absorb the heat in the air cooling galvanic pile 214, and then can avoid the air cooling galvanic pile 214 overtemperature to improve activation effect, shorten activation time.
Based on the above structure, the following table shows the effect and the main parameter values after introducing different amounts of water mist into the air stream.
Table 1: effect and main parameter values after introduction of different amounts of water mist into the air stream
Wherein "amount of water mist from low temperature water mist generator" in table 1 means amount of water mist into air stream of air-cooled electric pile, the first column unit is g/h (g/hr), the second column unit is mol/min (mol/min); the "heat taken away by water mist evaporation" in table 1 refers to the heat required when water mist fine particles entering the air-cooled galvanic pile along with air flow are gasified in the galvanic pile, and the heat of vaporization of water is 44 kJ/mol; the expression "heat quantity to be taken away by air in the galvanic pile" in table 1 means heat quantity to be discharged from the galvanic pile in order to ensure the temperature of the galvanic pile to be 57 ℃ besides the heat of vaporization; the "required air flow rate" in table 1 indicates how large the air flow rate at a temperature of 27 ℃ is to discharge the heat to be discharged; the "air metering ratio" in table 1 refers to the ratio of the amount of air required to be input to the stack to control the temperature of the stack at 57 ℃ to the amount of air required to participate in the reaction for power generation of the stack; the "water vapor volume ratio" in table 1 refers to the ratio of the volume of water mist fine particles from the low-temperature water mist generator after all the water mist fine particles are changed into steam in the electric pile to the volume of all the gas (air + water vapor) entering the electric pile.
As can be seen from Table 1, the effect of introducing the water mist generated by the low-temperature water mist generator into the air flow of the air-cooled electric pile is very obvious. Under the conventional condition, namely under the condition of not introducing water mist, the heat quantity to be taken away by air in the galvanic pile is 116.9kJ/min, and the air metering ratio is up to 69.4; after the water mist is introduced, the heat quantity which needs to be taken away by air in the electric pile is greatly reduced along with the increase of the introduced water mist quantity; for example, in the case of introducing 2650g/h of water mist, the heat quantity to be taken away by air in the galvanic pile is reduced to 9.0kJ/min, and the air metering ratio is reduced to 5.4.
The drop in air metering ratio brings additional benefits. Firstly, the possibility that the membrane electrode in the galvanic pile is blown dry is greatly reduced, secondly, the power consumption of the fan for supplying air is greatly reduced, thirdly, the wind resistance when the air passes through the galvanic pile is reduced, and the volume and the weight of the fan are favorably reduced.
The air-cooled stack activation test platform 200 with the low temperature water mist generator 221 enables flexible control of the relative humidity of the air entering the air-cooled stack 214. As mentioned previously, the saturated vapor pressure of water at 57 ℃ is 17.20kPa, i.e., the volume fraction of water vapor in the whole air is 17.0% (17.2/101). As can be seen from the last column of Table 1, when the amount of water mist from the low temperature water mist generator was controlled to 2650g/h, the volume ratio of water vapor to the whole gas entering the cell stack was 17.1. That is, around this water inflow, the relative humidity of the air in the 57 ℃ stack is well around 100%.
It should be noted that, in the present embodiment, the air-cooled stack activation testing platform 200 further includes an air supply unit 215; the air supply unit 215 is configured to send the mist generated by the air humidification unit 220 into the air-cooled electric stack 214 together with the outside air. By controlling the operating power of the air humidifying unit 220, the moisture content in the air entering the air-cooled stack can be adjusted.
The utility model discloses an in the embodiment, air humidifying unit 220 includes low temperature water fog generator 221, and low temperature water fog generator 221 is used for atomizing water, and at this in-process, for ensuring that air humidifying unit 220 can continuous operation, need carry out the moisturizing to air humidifying unit 220. Thus, the air humidification unit 220 further includes a water replenishing circuit 230, and the water replenishing circuit 230 is used to replenish water to the low temperature water mist generator 221.
In the present embodiment, the low temperature water mist generator 221 includes a water storage tank and a level gauge disposed in the water storage tank; the refill circuit 230 communicates with the storage tank. The air humidification unit 220 further comprises an electromagnetic valve 231 disposed in the water supplement circuit 230, and the electromagnetic valve 231 is used for communicating the water supplement circuit 230 with the water storage tank when the liquid level in the water storage tank is lower than a preset liquid level.
In order to make the water replenishing circuit 230 replenish water into the water storage tank when the water level in the water storage tank is lower than the preset water level, the air humidifying unit 220 is electrically connected to the electric control unit 213.
The electronic control unit 213 is configured to receive a liquid level signal output by the liquid level meter, and is configured to control the electromagnetic valve 231 to connect the water replenishing loop 230 with the water storage tank when the liquid level represented by the liquid level signal is lower than a preset liquid level.
Further, the electronic control unit 213 may be further connected to the low temperature water mist generator 221 to control the start/stop and the working power of the low temperature water mist generator 221, so as to adjust the working power of the low temperature water mist generator 221 according to the actual working state and the working condition of the fuel cell stack.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides an air cooling galvanic pile activation test platform which characterized in that:
the air-cooling galvanic pile activation test platform (200) comprises a conventional air-cooling galvanic pile test platform (210) and an air humidifying unit (220);
the air humidifying unit (220) is used for conveying water mist to the air-cooled electric pile (214) to be tested.
2. The air-cooled electric pile activation test platform of claim 1, characterized in that:
the air-cooled electric pile activation testing platform (200) further comprises an air supply unit (215);
the air supply unit (215) is used for sending the water mist generated by the air humidifying unit (220) and the outside air into the air-cooled electric pile (214).
3. The air-cooled electric pile activation test platform of claim 1, characterized in that:
the air humidification unit (220) includes a low-temperature water mist generator (221).
4. The air-cooled electric pile activation test platform of claim 3, characterized in that:
the air humidification unit (220) further comprises a water replenishing circuit (230), and the water replenishing circuit (230) is used for replenishing water to the low-temperature water mist generator (221).
5. The air-cooled electric pile activation test platform of claim 4, characterized in that:
the low-temperature water mist generator (221) comprises a water storage tank and a liquid level meter arranged in the water storage tank; the water replenishing loop (230) is communicated with the water storage tank;
the air humidification unit (220) further comprises an electromagnetic valve (231) arranged in the water supplementing loop (230), and the electromagnetic valve (231) is used for communicating the water supplementing loop (230) with the water storage tank when the liquid level in the water storage tank is lower than a preset liquid level.
6. The air-cooled electric pile activation test platform of claim 5, characterized in that:
the air-cooling electric pile activation test platform (200) further comprises an electric control unit (213), and the electric control unit (213) is electrically connected with the air humidifying unit (220);
the electric control unit (213) is used for receiving the liquid level signal output by the air humidifying unit (220) and controlling the electromagnetic valve (231) to conduct the water supplementing loop (230) with the water storage tank when the liquid level represented by the liquid level signal is lower than a preset liquid level.
7. The air-cooled electric pile activation test platform of claim 6, characterized in that:
the electric control unit (213) is used for controlling the starting, the stopping and the working power of the low-temperature water mist generator (221).
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