CN117039046A

CN117039046A - Fuel cell system and thermal efficiency improving method

Info

Publication number: CN117039046A
Application number: CN202311301526.9A
Authority: CN
Inventors: 李雄杰; 雷宪章; 张安安; 张永清
Original assignee: Chengdu Minshan Green Hydrogen Energy Co ltd
Current assignee: Chengdu Minshan Green Hydrogen Energy Co ltd
Priority date: 2023-10-10
Filing date: 2023-10-10
Publication date: 2023-11-10

Abstract

The application discloses a fuel cell system and a method for improving thermal efficiency, comprising the following steps: the device comprises a fuel cell device, a tail gas combustion device, an oxidation catalytic device, a heat exchange device, a control device, a cathode air supply device and an anode air supply device, wherein the cathode air supply device and the anode air supply device are communicated with the fuel cell device; a mixing component is arranged in the oxidation catalytic device; the control device is respectively and electrically connected with the cathode air supply device and the tail gas combustion device; the combustion waste gas enters the oxidation catalytic device, catalytic oxidation treatment is carried out on the combustion waste gas through the oxidation catalytic device, and the catalytic efficiency and the service life of the oxidation catalytic device are improved through the mixing component; the heat exchange device absorbs and transmits the heat of the combustion exhaust gas to the required part of the system, so that the problem of low heat efficiency of the existing fuel cell system is solved.

Description

Fuel cell system and thermal efficiency improving method

Technical Field

The present application relates to the field of fuel cell technologies, and in particular, to a fuel cell system and a method for improving thermal efficiency.

Background

The fuel cell is a power generation device capable of directly converting chemical energy of fuel into electric energy, and has the advantages of high efficiency, cleanness and the like. When the fuel cell system works, a large amount of hydrogen-containing gas is introduced into the anode and a large amount of oxygen-containing gas is introduced into the cathode, the anode gas and the cathode gas in the fuel cell cannot fully participate in the reaction, hydrogen-containing anode tail gas and oxygen-containing cathode tail gas are generated at the downstream of the fuel cell, the tail gas can be introduced into a downstream tail gas burner to be burnt to generate combustion waste gas, and the combustion waste gas contains a certain amount of hydrocarbon gas and must be properly treated, otherwise, the environment is polluted, and the thermal efficiency of the fuel cell system is reduced.

The existing fuel cell system cannot reasonably treat hydrocarbon gas in combustion exhaust gas in operation, so that the thermal efficiency of the fuel cell system is low and the environment is easy to pollute.

Disclosure of Invention

The application mainly aims to provide a fuel cell system and a method for improving the thermal efficiency, and aims to solve the problem of lower thermal efficiency of the existing fuel cell system.

In order to achieve the above object, the present application provides a fuel cell system comprising: the device comprises a fuel cell device, a tail gas combustion device, an oxidation catalytic device, a heat exchange device, a control device, a cathode air supply device and an anode air supply device, wherein the cathode air supply device and the anode air supply device are communicated with the fuel cell device, and the fuel cell device, the tail gas combustion device, the oxidation catalytic device and the heat exchange device are sequentially communicated; a mixing component is arranged in the oxidation catalytic device; the control device is respectively and electrically connected with the cathode air supply device and the tail gas combustion device;

The tail gas combustion device is used for burning and treating tail gas generated by the fuel cell device; the oxidation catalytic device is used for catalyzing hydrocarbon in combustion exhaust gas in the tail gas combustion device to be converted into non-pollutant; the mixing component is used for mixing the airflow flowing through the oxidation catalytic device so as to homogenize the temperature of the airflow flowing through the section; the heat exchange device is used for absorbing heat of the combustion exhaust gas and transmitting the heat to a required part of the system.

Optionally, the fuel cell device includes: the fuel cell comprises an anode, a cathode, an electrolyte and an end plate, wherein the anode and the cathode are respectively communicated with the anode air supply device and the cathode air supply device, the electrolyte is arranged between the anode and the cathode, the end plate is arranged at the communication position of the fuel cell device and the tail gas combustion device, and an electric interface is arranged on the fuel cell device; wherein the electrical interface is used for supplying the electric energy generated by the fuel cell device to an external electric appliance.

Optionally, the tail gas combustion device comprises: the fuel cell device comprises a first cavity, a second cavity, a third cavity and an ignition assembly, wherein two ends of the first cavity and the second cavity are respectively communicated with the fuel cell device and the third cavity, the ignition assembly is arranged in the third cavity, and the ignition assembly is electrically connected with the control device; the third cavity is used as a cavity for mixing and burning tail gas generated by the fuel cell device.

Optionally, the tail gas combustion device further comprises a flame sensor, wherein the flame sensor is installed in the third cavity, and the flame sensor is electrically connected with the control device.

Optionally, the mixing assembly is a mesh structure.

Optionally, the mixing assembly is a porous structure.

Optionally, the mixing assembly is a batting structure.

Optionally, the hybrid component is a multilayer metal structure.

Optionally, the device further comprises a cooling device, a first conveying mechanism and a second conveying mechanism, wherein the cooling device is communicated with the tail gas combustion device through the first conveying mechanism, and the first conveying mechanism is electrically connected with the control device;

the cathode air supply device is communicated with the fuel cell device through the second conveying mechanism, and the second conveying mechanism is electrically connected with the control device;

the first conveying mechanism is used for conveying cooling media required by the tail gas combustion device to the tail gas combustion device through the cooling device; the second conveying mechanism is used for conveying cathode gas required by the fuel cell device into the fuel cell device through the cathode gas supply device.

Optionally, the device further comprises a feeding device, an extraction device and a third conveying mechanism, wherein the feeding device and the extraction device are respectively arranged at an inlet and an outlet of cathode gas of the fuel cell device, and the third conveying mechanism is respectively communicated with the feeding device and the extraction device.

Optionally, the fuel cell device, the tail gas combustion device, the oxidation catalytic device and the heat exchange device are connected with each other in an integrated manner.

Optionally, a catalytic coating is disposed on the interface between the mixing assembly and the combustion exhaust.

In addition, to achieve the above object, the present application also provides a thermal efficiency improving method based on the fuel cell system, including:

controlling the cathode gas supply device and the anode gas supply device to supply required gases to the cathode and the anode of the fuel cell device respectively through the control device;

introducing the tail gas generated by the fuel cell device into the tail gas combustion device, and controlling the tail gas combustion device to burn the tail gas and generate combustion waste gas by a control device;

the combustion waste gas enters the oxidation catalytic device, catalytic oxidation treatment is carried out on the combustion waste gas through the oxidation catalytic device, and the catalytic efficiency of the oxidation catalytic device is improved through the mixing component;

The combustion exhaust gas after catalytic oxidation treatment is led into the heat exchange device, and the heat of the combustion exhaust gas is absorbed and transferred to the needed part of the system through the heat exchange device.

The fuel cell system and the method for improving the thermal efficiency provided by the embodiment of the application comprise the following steps: the device comprises a fuel cell device, a tail gas combustion device, an oxidation catalytic device, a heat exchange device, a control device, a cathode air supply device and an anode air supply device, wherein the cathode air supply device and the anode air supply device are communicated with the fuel cell device; a mixing component is arranged in the oxidation catalytic device; the control device is respectively and electrically connected with the cathode air supply device and the tail gas combustion device; the tail gas combustion device is used for burning and treating tail gas generated by the fuel cell device; the oxidation catalytic device is used for catalyzing hydrocarbon in combustion exhaust gas in the tail gas combustion device to be converted into non-pollutant; the mixing assembly is used for homogenizing the temperature of the airflow flowing through the cross section; the heat exchange device is used for absorbing heat of the combustion exhaust gas and transmitting the heat to a part required by the system; controlling the cathode gas supply device and the anode gas supply device to supply required gases to the cathode and the anode of the fuel cell device respectively through the control device; introducing the tail gas generated by the fuel cell device into the tail gas combustion device, and controlling the tail gas combustion device to burn the tail gas and generate combustion waste gas by a control device; the combustion waste gas enters the oxidation catalytic device, catalytic oxidation treatment is carried out on the combustion waste gas through the oxidation catalytic device, and the catalytic efficiency and the service life of the oxidation catalytic device are improved through the mixing component; the combustion waste gas after catalytic oxidation treatment is led into the heat exchange device, and the heat of the combustion waste gas is absorbed and transferred to the needed part of the system through the heat exchange device, so that the heat efficiency of the system is improved, and the problem of lower heat efficiency of the existing fuel cell system is solved.

Drawings

Fig. 1 is a schematic diagram of a fuel cell system according to a first embodiment of the present application;

fig. 2 is a schematic diagram of a fuel cell system according to a second embodiment of the present application;

fig. 3 is a schematic diagram of a fuel cell system according to a third embodiment of the present application;

fig. 4 is a schematic diagram of a fuel cell system according to a fourth embodiment of the present application;

fig. 5 is a schematic diagram of a fuel cell system according to a fifth embodiment of the present application;

fig. 6 is a schematic diagram of a fuel cell system according to a sixth embodiment of the present application;

FIG. 7 is a schematic structural diagram of a mixing assembly according to a seventh embodiment of the application;

FIG. 8 is a schematic diagram of a mixing assembly according to an eighth embodiment of the application;

FIG. 9 is a schematic diagram of a mixing assembly according to a ninth embodiment of the application;

FIG. 10 is a schematic view of a mixing assembly according to a tenth embodiment of the application;

FIG. 11 is a schematic structural view of a hybrid module according to an eleventh embodiment of the present application;

FIG. 12 is a flow chart of a thermal efficiency enhancement method according to an embodiment of the present application;

legend: 1-fuel cell device, 101-anode, 102-cathode, 103-electrolyte, 104-end plate, 105-electrical interface, 2-exhaust gas combustion device, 201-first cavity, 202-second cavity, 203-third cavity, 204-ignition assembly, 205-flame sensor, 206-first temperature sensor, 207-second temperature sensor, 208-third temperature sensor, 3-oxidation catalyst device, 31-mixing assembly, 3101-sheet, 3102-baffle, 3103-turnout, 3104-gas flow channel, 3105-first stage, 3106-second stage, 3107-third stage, 32-fourth temperature sensor, 4-heat exchange device, 41-heat transfer medium, 5-control device, 6-cooling device, 601-first delivery mechanism, 7-cathode gas supply, 701-second delivery mechanism, 8-anode gas supply, 9-feed device, 10-extraction device, 11-third delivery mechanism.

The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present application, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Example 1

Referring to fig. 1, a fuel cell system includes: the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3, the heat exchange device 4, the control device 5, the cathode air supply device 7 and the anode air supply device 8 are communicated with the fuel cell device 1, and the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3 and the heat exchange device 4 are communicated in sequence; a mixing component 31 is arranged in the oxidation catalytic device 3; the control device 5 is respectively and electrically connected with the cathode air supply device 7 and the tail gas combustion device 2; wherein the tail gas combustion device 2 is used for combustion treatment of tail gas generated by the fuel cell device 1; the oxidation catalytic device 3 is used for catalyzing hydrocarbon in the combustion exhaust gas in the tail gas combustion device 2 to be converted into non-pollutant; the mixing assembly 31 is used for mixing the gas flow flowing through the oxidation catalytic device 3 so as to homogenize the temperature of the gas flow flowing through the section; the heat exchange device 4 is used for absorbing heat of the combustion exhaust gas and transmitting the heat to a part required by the system; in this embodiment, the control device 5 may be a control terminal, such as a computer; the oxidation catalyst device 3 is integrated with the tail gas combustion device 2, as shown in fig. 1, the combustion waste gas flows through the oxidation catalyst device 3 and flows out of the tail gas combustion device 2 from the air outlet of the downstream tail gas combustion device 2, and then enters the heat exchange device 4, and the oxidation catalyst device 3 is communicated with the third cavity 203 in the tail gas combustion device 2; the heat exchanger device 4 is in communication with the tail gas burner device 2 on the one hand and on the other hand, a suitable heat transfer medium is passed through the heat exchanger device 4, the introduction medium transferring heat to the desired part of the system, such as to the cathode gas of the fuel cell, thereby improving the thermal efficiency.

The fuel cell device 1 includes: an anode 101, a cathode 102, an electrolyte 103 and an end plate 104, wherein the anode 101 and the cathode 102 are respectively communicated with the anode air supply device 8 and the cathode air supply device 7, the electrolyte 103 is arranged between the anode 101 and the cathode 102, the end plate 104 is arranged at the communication position of the fuel cell device 1 and the tail gas combustion device 2, and an electric interface 105 is arranged on the fuel cell device 1; wherein the electrical interface 105 is used for supplying the electrical energy generated by the fuel cell device 1 to an external electrical appliance;

in this embodiment, air may be used as the gas required for the cathode 102, and pure hydrogen or hydrogen-containing synthesis gas (hydrocarbon fuel reformed gas) may be used as the gas required for the anode 101; at least one of the electrical interfaces 105.

The exhaust gas combustion device 2 includes: the fuel cell device comprises a first cavity 201, a second cavity 202, a third cavity 203 and an ignition assembly 204, wherein two ends of the first cavity 201 and the second cavity 202 are respectively communicated with the fuel cell device 1 and the third cavity 203, the ignition assembly 204 is arranged in the third cavity 203, and the ignition assembly 204 is electrically connected with the control device 5; wherein the third cavity 203 is used as a cavity for mixing and burning the exhaust gas generated by the fuel cell device 1.

In this embodiment, the tail gas combustion apparatus 2 further includes a flame sensor 205, the flame sensor 205 is installed in the third cavity 203, the flame sensor 205 is electrically connected to the control apparatus 5, and the flame sensor 205 monitors whether a flame exists in the third cavity 203, and feeds back flame data to the control apparatus 5 in real time, and the control apparatus 5 controls the ignition component 204 to perform ignition according to an actual flame condition;

in this embodiment, the temperature sensor further includes a first temperature sensor 206, a second temperature sensor 207, a third temperature sensor 208, and a fourth temperature sensor 32, where the first temperature sensor 206, the second temperature sensor 207, the third temperature sensor 208, and the fourth temperature sensor 32 are electrically connected to the control device 5; the first temperature sensor 206 is arranged at the air flow inlet of the oxidation catalytic device 3, the second temperature sensor 207 is arranged at the air flow outlet of the oxidation catalytic device 3, the third temperature sensor 208 is arranged at the downstream of the oxidation catalytic device 3, the fourth temperature sensor 32 is arranged inside the oxidation catalytic device 3, the air flow temperature before entering the oxidation catalytic device 3 is monitored through the first temperature sensor 206, the air flow temperature just after exiting the oxidation catalytic device 3 is monitored through the second temperature sensor 207, the air flow temperature at the downstream of the oxidation catalytic device 3 is monitored through the third temperature sensor 208, the air flow temperature inside the oxidation catalytic device 3 is monitored through the fourth temperature sensor 32, flame data and temperature data are fed back to the control device 5 in real time, the ignition component 204 is controlled by the control device 5 according to actual flame and temperature conditions, and the tail gas combustion device 2 is controlled by the cooling device 6 to perform cooling treatment; a fourth temperature sensor 32 may be further disposed on the oxidation catalyst device 3, where the fourth temperature sensor 32 is configured to monitor the real-time temperature of the oxidation catalyst device 3, so as to dynamically monitor the temperature of the oxidation catalyst device 3 in real time, and perform corresponding processing.

The device also comprises a cooling device 6, a first conveying mechanism 601 and a second conveying mechanism 701, wherein the cooling device 6 is communicated with the tail gas combustion device 2 through the first conveying mechanism 601, and the first conveying mechanism 601 is electrically connected with the control device 5; in this embodiment, the first conveying mechanism 601 may be a cooling gas pump or a cooling gas blower, the cooling gas adopts an oxygen-containing gas, and the oxygen-containing gas may be air; the cooling gas is introduced into the cathode tail gas inlet end of the tail gas combustion device 2, is mixed with the cathode tail gas entering the tail gas combustion device 2, is mixed with the anode tail gas in the third cavity 203 of the tail gas combustion device 2, and is combusted in the third cavity 203;

the cathode air supply device 7 is communicated with the fuel cell device 1 through the second conveying mechanism 701, and the second conveying mechanism 701 is electrically connected with the control device 5;

wherein the first conveying mechanism 601 is used for conveying a cooling medium required by the tail gas combustion device 2 from the cooling device 6 to the tail gas combustion device 2; the second delivery mechanism 701 is for delivering cathode gas required for the fuel cell apparatus 1 from the cathode gas supply apparatus 7 into the fuel cell apparatus 1.

The device also comprises a feeding device 9, an extraction device 10 and a third conveying mechanism 11, wherein the feeding device 9 and the extraction device 10 are respectively arranged at the inlet and the outlet of cathode gas of the fuel cell device 1, and the third conveying mechanism 11 is respectively communicated with the feeding device 9 and the extraction device 10.

The fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3 and the heat exchange device 4 are connected with each other in an integrated manner.

The interface between the mixing assembly 31 and the combustion exhaust is provided with a catalytic coating.

Example two

Referring to fig. 2, a fuel cell system includes: the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3, the heat exchange device 4, the control device 5, the cathode air supply device 7 and the anode air supply device 8 are communicated with the fuel cell device 1, and the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3 and the heat exchange device 4 are communicated in sequence; a mixing component 31 is arranged in the oxidation catalytic device 3; the control device 5 is respectively and electrically connected with the cathode air supply device 7 and the tail gas combustion device 2; wherein the tail gas combustion device 2 is used for combustion treatment of tail gas generated by the fuel cell device 1; the oxidation catalytic device 3 is used for catalyzing hydrocarbon in the combustion exhaust gas in the tail gas combustion device 2 to be converted into non-pollutant; the mixing assembly 31 is used for mixing the gas flow flowing through the oxidation catalytic device 3 so as to homogenize the temperature of the gas flow flowing through the section; the heat exchange device 4 is used for absorbing heat of the combustion exhaust gas and transmitting the heat to a part required by the system; in this embodiment, the control device 5 may be a control terminal, such as a computer; the oxidation catalytic device 3 and the heat exchange device 4 are integrated with the tail gas combustion device 2, as shown in fig. 2, combustion exhaust gas flows through the oxidation catalytic device 3 and enters the heat exchange device 4, the oxidation catalytic device 3 is communicated with the third cavity 203 in the tail gas combustion device 2, and the heat exchange device 4 is directly communicated with the tail part of the tail gas combustion device 2; the heat exchanger device 4 is in communication with the tail gas burner device 2 on the one hand and on the other hand, a suitable heat transfer medium is passed through the heat exchanger device 4, the introduction medium transferring heat to the desired part of the system, such as to the cathode gas of the fuel cell, thereby improving the thermal efficiency.

Example III

Referring to fig. 3, referring to fig. 1, a fuel cell system includes: the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3, the heat exchange device 4, the control device 5, the cathode air supply device 7 and the anode air supply device 8 are communicated with the fuel cell device 1, and the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3 and the heat exchange device 4 are communicated in sequence; a mixing component 31 is arranged in the oxidation catalytic device 3; the control device 5 is respectively and electrically connected with the cathode air supply device 7 and the tail gas combustion device 2; wherein the tail gas combustion device 2 is used for combustion treatment of tail gas generated by the fuel cell device 1; the oxidation catalytic device 3 is used for catalyzing hydrocarbon in the combustion exhaust gas in the tail gas combustion device 2 to be converted into non-pollutant; the mixing assembly 31 is used for mixing the gas flow flowing through the oxidation catalytic device 3 so as to homogenize the temperature of the gas flow flowing through the section; the heat exchange device 4 is used for absorbing heat of the combustion exhaust gas and transmitting the heat to a part required by the system; in this embodiment, the control device 5 may be a control terminal, such as a computer; the heat exchange means 4 is integrated with the oxidation catalyst means 3 and the integrated oxidation catalyst means 3 is integrated with the exhaust gas combustion means 2, as shown in fig. 3, so that the heat released by the oxidation catalyst means 3 during the treatment of the combustion exhaust gas can also be used for the heat exchange means 4 and is easily transferred to the heat transfer medium 41, thereby improving the heat efficiency.

Example IV

Referring to fig. 4, a fuel cell system includes: the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3, the heat exchange device 4, the control device 5, the cathode air supply device 7 and the anode air supply device 8 are communicated with the fuel cell device 1, and the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3 and the heat exchange device 4 are communicated in sequence; a mixing component 31 is arranged in the oxidation catalytic device 3; the control device 5 is respectively and electrically connected with the cathode air supply device 7 and the tail gas combustion device 2; wherein the tail gas combustion device 2 is used for combustion treatment of tail gas generated by the fuel cell device 1; the oxidation catalytic device 3 is used for catalyzing hydrocarbon in the combustion exhaust gas in the tail gas combustion device 2 to be converted into non-pollutant; the mixing assembly 31 is used for mixing the gas flow flowing through the oxidation catalytic device 3 so as to homogenize the temperature of the gas flow flowing through the section; the heat exchange device 4 is used for absorbing heat of the combustion exhaust gas and transmitting the heat to a part required by the system; in this embodiment, the control device 5 may be a control terminal, such as a computer; the fuel cell device 1 is integrated with the tail gas combustion device 2 as shown in fig. 4, reducing the intermediate heat loss, thereby improving the thermal efficiency.

Example five

Referring to fig. 5, a fuel cell system includes: the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3, the heat exchange device 4, the control device 5, the cathode air supply device 7 and the anode air supply device 8 are communicated with the fuel cell device 1, and the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3 and the heat exchange device 4 are communicated in sequence; a mixing component 31 is arranged in the oxidation catalytic device 3; the control device 5 is respectively and electrically connected with the cathode air supply device 7 and the tail gas combustion device 2; wherein the tail gas combustion device 2 is used for combustion treatment of tail gas generated by the fuel cell device 1; the oxidation catalytic device 3 is used for catalyzing hydrocarbon in the combustion exhaust gas in the tail gas combustion device 2 to be converted into non-pollutant; the mixing assembly 31 is used for mixing the gas flow flowing through the oxidation catalytic device 3 so as to homogenize the temperature of the gas flow flowing through the section; the heat exchange device 4 is used for absorbing heat of the combustion exhaust gas and transmitting the heat to a part required by the system; in this embodiment, the control device 5 may be a control terminal, such as a computer; the oxidation catalyst device 3 can be separated from the tail gas combustion device 2 according to the actual situation, as shown in fig. 5, which is beneficial to the actual use.

Example six

Referring to fig. 6, a fuel cell system includes: the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3, the heat exchange device 4, the control device 5, the cathode air supply device 7 and the anode air supply device 8 are communicated with the fuel cell device 1, and the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3 and the heat exchange device 4 are communicated in sequence; a mixing component 31 is arranged in the oxidation catalytic device 3; the control device 5 is respectively and electrically connected with the cathode air supply device 7 and the tail gas combustion device 2; wherein the tail gas combustion device 2 is used for combustion treatment of tail gas generated by the fuel cell device 1; the oxidation catalytic device 3 is used for catalyzing hydrocarbon in the combustion exhaust gas in the tail gas combustion device 2 to be converted into non-pollutant; the mixing assembly 31 is used for mixing the gas flow flowing through the oxidation catalytic device 3 so as to homogenize the temperature of the gas flow flowing through the section; the heat exchange device 4 is used for absorbing heat of the combustion exhaust gas and transmitting the heat to a part required by the system; in this embodiment, the control device 5 may be a control terminal, such as a computer; the oxidation catalyst 3 is integrated with the heat exchange device 4, as shown in fig. 6, to facilitate practical use.

Example seven

A fuel cell system comprising: the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3, the heat exchange device 4, the control device 5, the cathode air supply device 7 and the anode air supply device 8 are communicated with the fuel cell device 1, and the fuel cell device 1, the tail gas combustion device 2, the oxidation catalytic device 3 and the heat exchange device 4 are communicated in sequence; a mixing component 31 is arranged in the oxidation catalytic device 3; the control device 5 is respectively and electrically connected with the cathode air supply device 7 and the tail gas combustion device 2; wherein the tail gas combustion device 2 is used for combustion treatment of tail gas generated by the fuel cell device 1; the oxidation catalytic device 3 is used for catalyzing hydrocarbon in the combustion exhaust gas in the tail gas combustion device 2 to be converted into non-pollutant; the mixing assembly 31 is used for mixing the gas flow flowing through the oxidation catalytic device 3 so as to homogenize the temperature of the gas flow flowing through the section; the heat exchange device 4 is used for absorbing heat of the combustion exhaust gas and transmitting the heat to a part required by the system; in this embodiment, the control device 5 may be a control terminal, such as a computer.

As shown in fig. 7, in this embodiment, the mixing assembly 31 includes a plurality of thin plates 3101 and a flow guiding member 3102, the thin plates 3101 are installed in the oxidation catalytic device 3 to form a multi-layer structure, an airflow channel 3104 is formed between every two layers of thin plates 3101, the thin plates 3101 are provided with a plurality of turnouts 3103, the turnouts 3103 are staggered, and the flow guiding member 3102 is obliquely arranged at the junction of the turnouts 3103 and the airflow channel 3104.

Example eight

As shown in fig. 8, in the present embodiment, the mixing assembly 31 is divided into a first stage 3105, a second stage 3106 and a third stage 3107 in order from the direction of the air flow, the first stage 3105 is a catalytically inactive stage, that is, the first stage 3105 is not provided with a catalytically active coating, the second stage 3106 and the third stage 3107 are provided with a catalytically active coating, and the catalytic activity of the third stage 3107 is stronger than that of the second stage 3106; the first stage 3105, the second stage 3106, and the third stage 3107 may be integrated into one mixing assembly 31, or at least one of the stages may be assembled separately into one mixing assembly 31; for example: the separation of the first stage 3105 from the second stage 3106 and the third stage 3107 into two structural elements and the assembly of one mixing assembly 31 facilitates the manufacture of mixing assemblies 31 with staged catalytic coating.

Example nine

As shown in fig. 9, in this embodiment, the mixing component 31 has a porous structure, and the porous structure may be made of ceramic or metal, such as metal foam, and the surface of the porous structure is coated with a catalyst material, which may be platinum, rhodium or palladium.

Examples ten

As shown in fig. 10, in this embodiment, the hybrid module 31 may be processed into a braid or mesh structure by fibers or wires, to achieve a structured arrangement of the fibers or wires, to provide the hybrid module 31 with high load-bearing capacity, and to have high flexibility, and to apply a catalytically active coating on the surface of the hybrid module 31 of the fiber or wire structure.

Example eleven

In this embodiment, as shown in fig. 11, the mixing element 31 is in a batting form, in an unstructured, amorphous state, and a catalytically active coating is applied to the surface of the batting mixing element 31.

Example twelve

Referring to fig. 12, an embodiment of the present application provides a thermal efficiency improvement method based on the fuel cell system; the heat efficiency improving method comprises the following steps:

controlling the cathode gas supply device 7 and the anode gas supply device 8 by the control device 5 to supply the required gases to the cathode and the anode of the fuel cell device 1, respectively;

introducing the tail gas generated by the fuel cell device 1 into the tail gas combustion device 2, and controlling the tail gas combustion device 2 to burn the tail gas and generate combustion waste gas through a control device 5;

the combustion exhaust gas enters the oxidation catalytic device 3, the combustion exhaust gas is subjected to catalytic oxidation treatment through the oxidation catalytic device 3, and the catalytic efficiency of the oxidation catalytic device 3 is improved through the mixing component 31;

The combustion exhaust gas after the catalytic oxidation treatment is led to the heat exchange device 4, and the heat of the combustion exhaust gas is absorbed and transferred to a required part of the system through the heat exchange device 4.

The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims

1. A fuel cell system, characterized by comprising: the device comprises a fuel cell device (1), a tail gas combustion device (2), an oxidation catalytic device (3), a heat exchange device (4), a control device (5), a cathode air supply device (7) and an anode air supply device (8), wherein the cathode air supply device (7) and the anode air supply device (8) are communicated with the fuel cell device (1), and the fuel cell device (1), the tail gas combustion device (2), the oxidation catalytic device (3) and the heat exchange device (4) are sequentially communicated; a mixing component (31) is arranged in the oxidation catalytic device (3); the control device (5) is respectively and electrically connected with the cathode air supply device (7) and the tail gas combustion device (2);

Wherein the tail gas combustion device (2) is used for burning and treating the tail gas generated by the fuel cell device (1); the oxidation catalytic device (3) is used for catalyzing hydrocarbon in combustion exhaust gas in the tail gas combustion device (2) to be converted into non-pollutant; the mixing component (31) is used for mixing the airflow flowing through the oxidation catalytic device (3) so as to homogenize the temperature of the airflow flowing through the section; the heat exchange device (4) is used for absorbing heat of the combustion exhaust gas and transmitting the heat to a required part of the system.

2. The fuel cell system according to claim 1, wherein the fuel cell device (1) includes: an anode (101), a cathode (102), an electrolyte (103) and an end plate (104), wherein the anode (101) and the cathode (102) are respectively communicated with the anode gas supply device (8) and the cathode gas supply device (7), the electrolyte (103) is arranged between the anode (101) and the cathode (102), the end plate (104) is arranged at the communication position of the fuel cell device (1) and the tail gas combustion device (2), and an electric interface (105) is arranged on the fuel cell device (1); wherein the electrical interface (105) is used for supplying the electrical energy generated by the fuel cell device (1) to an external electrical appliance.

3. The fuel cell system according to claim 1, wherein the exhaust gas combustion device (2) includes: the fuel cell device comprises a first cavity (201), a second cavity (202), a third cavity (203) and an ignition assembly (204), wherein two ends of the first cavity (201) and the second cavity (202) are respectively communicated with the fuel cell device (1) and the third cavity (203), the ignition assembly (204) is arranged in the third cavity (203), and the ignition assembly (204) is electrically connected with the control device (5); wherein the third cavity (203) is used as a cavity for mixing and burning the tail gas generated by the fuel cell device (1).

4. The fuel cell system according to claim 1, wherein the tail gas combustion device (2) further comprises a flame sensor (205), the flame sensor (205) being mounted in the third cavity (203), the flame sensor (205) being electrically connected to the control device (5).

5. The fuel cell system according to claim 1, wherein the mixing member (31) is a mesh structure.

6. The fuel cell system according to claim 1, further comprising a cooling device (6), a first conveying mechanism (601) and a second conveying mechanism (701), the cooling device (6) being in communication with the tail gas combustion device (2) through the first conveying mechanism (601), the first conveying mechanism (601) being electrically connected to the control device (5);

The cathode air supply device (7) is communicated with the fuel cell device (1) through the second conveying mechanism (701), and the second conveying mechanism (701) is electrically connected with the control device (5);

wherein the first conveying mechanism (601) is used for conveying a cooling medium required by the tail gas combustion device (2) from the cooling device (6) to the tail gas combustion device (2); the second conveying mechanism (701) is used for conveying cathode gas required by the fuel cell device (1) into the fuel cell device (1) through the cathode gas supply device (7).

7. The fuel cell system according to claim 1, further comprising a feeding device (9), an extraction device (10) and a third conveying mechanism (11), wherein the feeding device (9) and the extraction device (10) are respectively arranged at an inlet and an outlet of cathode gas of the fuel cell device (1), and the third conveying mechanism (11) is respectively communicated with the feeding device (9) and the extraction device (10).

8. The fuel cell system according to claim 1, characterized in that the fuel cell device (1), the exhaust gas combustion device (2), the oxidation catalyst device (3) and the heat exchange device (4) are integrally connected to each other.

9. A fuel cell system according to any one of claims 1-8, characterized in that a catalytic coating is provided on the interface between the mixing assembly (31) and the combustion exhaust gases.

10. A thermal efficiency improvement method based on the fuel cell system according to any one of claims 1 to 9, characterized by comprising:

-controlling the cathode gas supply means (7) and the anode gas supply means (8) by means of the control means (5) to supply the required gas to the cathode of the fuel cell device (1) and the anode of the fuel cell device (1), respectively;

introducing the tail gas generated by the fuel cell device (1) into the tail gas combustion device (2), and controlling the tail gas combustion device (2) to burn the tail gas and generate combustion waste gas through a control device (5);

the combustion exhaust gas enters the oxidation catalytic device (3), catalytic oxidation treatment is carried out on the combustion exhaust gas through the oxidation catalytic device (3), and the catalytic efficiency of the oxidation catalytic device (3) is improved through the mixing component (31);

the combustion exhaust gas after catalytic oxidation treatment is led to the heat exchange device (4), and the heat of the combustion exhaust gas is absorbed and transferred to a required part of the system through the heat exchange device (4).