Tail gas recovery device and recovery system

Abstract

The embodiment of the utility model provides a tail gas recovery device and system, and relates to the technical field of hydrogen fuel cells, the tail gas recovery device comprises a condensation assembly, a water storage piece and a control assembly, and the control assembly is used for being connected with an exhaust part of hydrogen fuel cell equipment, the condensation assembly and the water storage piece; the control assembly at least has a water recovery mode and a heat recovery mode. In the water recovery mode, the control assembly controls tail gas in the exhaust part to flow into the condensation assembly so that the tail gas can be cooled into water and then flow into the water storage piece. And in the heat recovery mode, the control assembly controls tail gas in the exhaust part to flow into the condensation assembly so as to heat air on the peripheral side of the condensation assembly for heating. According to the tail gas recovery device provided by the embodiment of the invention, water and heat in the tail gas of the hydrogen fuel cell can be recycled as required, so that the waste of resources is reduced.

Description

Technical Field

[0001] This application relates to the field of hydrogen fuel cell technology, and in particular to a tail gas recovery device and recovery system. Background Technology

[0002] Hydrogen fuel cell vehicles are cars that use hydrogen as their primary energy source, replacing the traditional engine with a fuel cell and an electric motor. They are currently in their early stages.

[0003] The principle of hydrogen fuel cell vehicles is to input hydrogen into a fuel cell. The electrons of the hydrogen atoms are blocked by the proton exchange membrane and conducted from the negative electrode to the positive electrode through the external circuit, which is converted into electrical energy to drive the electric motor. The protons can pass through the proton exchange membrane and combine with oxygen to form pure water mist, which is discharged, thus achieving environmental protection.

[0004] However, water and heat from the exhaust of existing hydrogen fuel cell vehicles are directly emitted into the atmosphere, resulting in a waste of water and heat resources. Utility Model Content

[0005] Based on this, this application provides an exhaust gas recovery device and system to solve the problem of water and heat being directly emitted into the atmosphere from the exhaust gas of existing hydrogen fuel cell vehicles, resulting in the waste of water resources and heat.

[0006] In a first aspect, this application provides a device for recovering exhaust gas, comprising:

[0007] Condensation components;

[0008] Water storage components;

[0009] A control component is provided for connection to the exhaust section, condensation component and water storage component of the hydrogen fuel cell device, respectively. The control component has at least a water recovery mode and a heat recovery mode.

[0010] In water recovery mode, the control unit controls the exhaust gas in the exhaust section to flow into the condensation unit, so that it is cooled into water and then flows into the water storage unit;

[0011] In heat recovery mode, the control unit controls the exhaust gas in the exhaust section to flow into the condenser assembly, so as to heat the air around the condenser assembly for heating.

[0012] In one possible implementation, the control component includes a controller, a first control valve, and a second control valve, wherein the controller is electrically connected to the first control valve and the second control valve respectively, and the controller has at least a water recovery mode and a heat recovery mode.

[0013] The first control valve is used to connect between the exhaust section and the condenser assembly, and the second control valve is connected between the condenser assembly and the water storage unit;

[0014] In water recovery mode, the controller controls the opening of the first and second control valves so that the exhaust gas in the exhaust section is cooled into water by the condensation assembly and then flows into the water storage container.

[0015] In heat recovery mode, the controller controls the first control valve to open and the second control valve to close, so that the exhaust gas in the exhaust section is heated by the condenser assembly to provide heating to the surrounding air.

[0016] In one possible implementation, a detection element is provided inside the water storage device. The detection element is used to detect the water level in the water storage device and is electrically connected to the controller.

[0017] In water recovery mode, when the water level in the water storage device is equal to or greater than the preset water level, the controller will at least close the first control valve.

[0018] In one possible implementation, the controller also has a hybrid recovery mode, in which the controller controls both the first control valve and the second control valve to open, and the exhaust gas in the exhaust section flows into the condenser assembly to cool into water and heat the air around the condenser assembly. The water flows into the water storage container, and the heated air is used for heating.

[0019] In one possible implementation, a detection element is provided inside the water storage device. The detection element is used to detect the water level in the water storage device and is electrically connected to the controller.

[0020] In the mixed recycling mode, when the water level in the water storage device is equal to or greater than the preset water level, the controller controls the second control valve to stop the water from flowing into the water storage device and drains away the water generated thereafter.

[0021] In one possible implementation, the second control valve is also used to connect to the venting section. In the mixed recovery mode, when the water level in the water storage device is equal to or greater than the preset water level, the controller controls the second control valve to discharge the subsequently generated water to the venting section.

[0022] In one possible implementation, the second control valve is a three-way valve, with three valve ports on the three-way valve for connecting to the condenser assembly, the water storage unit, and the vent, respectively.

[0023] And / or, at least one of the first control valve and the second control valve is a solenoid valve.

[0024] In one possible implementation, the condenser assembly is also used to connect to the exhaust section to remove the exhaust gas after passing through the condenser assembly.

[0025] In one possible implementation, the condensation assembly includes a condenser and a fan, with the condenser having an air inlet, a water outlet, and an exhaust outlet.

[0026] The air inlet is connected to the first control valve, and the water outlet is connected to the second control valve.

[0027] The exhaust port is used to connect to the exhaust section, and the fan blows air towards the condenser.

[0028] Secondly, this application also provides an exhaust gas recovery system, including a hydrogen fuel cell device and any of the exhaust gas recovery devices provided in the first aspect, wherein the hydrogen fuel cell device has an exhaust section, and the exhaust section is connected to at least a control component in the exhaust gas recovery device.

[0029] The exhaust gas recovery device and system provided in this application include a condensation component, a water storage component, and a control component. The control component is connected to the exhaust section, condensation component, and water storage component of the hydrogen fuel cell device. The control component has at least two modes: a water recovery mode and a heat recovery mode. In the water recovery mode, the control component controls the exhaust gas from the exhaust section to flow into the condensation component, where it is cooled into water and then flows into the water storage component. In the heat recovery mode, the control component controls the exhaust gas from the exhaust section to flow into the condensation component, where it heats the air surrounding the condensation component for heating. Therefore, the exhaust gas recovery device provided in this application can recover and reuse water and heat from the hydrogen fuel cell exhaust gas on demand, thereby reducing resource waste. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the connection relationship of the exhaust gas recovery system provided in the embodiments of this application;

[0032] Figure 2 for Figure 1 A partial structural diagram.

[0033] Figure label:

[0034] 10: Exhaust section;

[0035] 100: Condensation assembly;

[0036] 110: Condenser;

[0037] 111: Air intake;

[0038] 112: Water outlet;

[0039] 113: Exhaust port;

[0040] 120: Fan;

[0041] 200: Water storage component;

[0042] 210: Inspection item;

[0043] 300: Control component;

[0044] 310: Controller;

[0045] 320: First control valve;

[0046] 330: Second control valve. Detailed Implementation

[0047] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of methods and apparatus consistent with some aspects of this application as detailed in the appended claims.

[0048] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0049] As mentioned in the background section, hydrogen fuel cell vehicles are still in their early stages, and exhaust gas recovery devices are rarely seen in actual vehicles. Currently, most hydrogen fuel cell vehicles and pure electric vehicles on the market use PTC electric heaters for passenger cabin heating, which consumes a large amount of electricity. Moreover, the PTC power in heavy trucks or buses can reach around 8000W, significantly impacting the vehicle's range. In addition, heavy trucks typically carry water tanks to spray and cool the wheel hubs to prevent overheating from frequent braking. Furthermore, heavy trucks, serving as mobile homes for drivers, also require regular replenishment of drinking water for washing and cleaning. Therefore, for fuel cell vehicles, the water vapor and heat generated in the exhaust gas during operation are directly released into the atmosphere, resulting in a significant waste of water and heat resources.

[0050] To address the aforementioned problems in the prior art, this application provides a tail gas recovery device and system. The tail gas recovery device provided by this application includes a condensation component, a water storage component, and a control component. The control component is connected to the exhaust section, condensation component, and water storage component of a hydrogen fuel cell device. The control component has at least a water recovery mode and a heat recovery mode. In the water recovery mode, the control component controls the tail gas in the exhaust section to flow into the condensation component, where it is cooled into water and then flows into the water storage component. In the heat recovery mode, the control component controls the tail gas in the exhaust section to flow into the condensation component, where it heats the air surrounding the condensation component for heating. In other words, by recovering and utilizing the water and heat from the hydrogen fuel cell tail gas on demand, resource waste is reduced.

[0051] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0052] Firstly, please refer to Figures 1-2 As shown in the figure, this application provides an exhaust gas recovery device, including a condensation component 100, a water storage component 200, and a control component 300.

[0053] The control component 300 is used to connect to the exhaust section 10, the condensation component 100, and the water storage component 200 of the hydrogen fuel cell device, respectively. The control component 300 has at least a water recovery mode and a heat recovery mode.

[0054] In water recovery mode, the control component 300 controls the exhaust gas in the exhaust section 10 to flow into the condensation component 100, so that it is cooled into water and then flows into the water storage component 200.

[0055] In heat recovery mode, the control component 300 controls the exhaust gas in the exhaust section 10 to flow into the condenser component 100 to heat the air around the condenser component 100 for heating.

[0056] In this embodiment, the hydrogen fuel cell device can be a hydrogen fuel cell vehicle, a hydrogen fuel cell stack, etc., while the exhaust section 10 is used to discharge the exhaust gas generated by the operation of the hydrogen fuel cell, and it can be an exhaust pipe, an exhaust port, etc.

[0057] In this embodiment, the condenser assembly 100 is used to cool water vapor in the exhaust gas into water, or to exchange heat with ambient air. It can consist of a condenser and a fan. The condenser, also called a heat exchanger, can be composed of a heat dissipation coil and heat dissipation fins. The periphery of the condenser assembly 100 can be connected to the vehicle's passenger compartment through ducts.

[0058] The water storage component 200 in this embodiment is used to store water resources, and it can be a water storage tank, water storage vessel, or water storage bucket, etc.

[0059] In this embodiment, the control component 300 is used to control whether the exhaust gas in the exhaust section 10 flows into the condensation component 100. It can consist of a valve and a controller. The control component 300 has at least two control modes: a water recovery mode and a heat recovery mode, so that recovery can be selected as needed. The control component 300 can be implemented electronically or manually.

[0060] Specifically, the exhaust section 10 of the hydrogen fuel cell device can be connected to the condenser assembly 100 via a pipeline through the control component 300, and the water storage unit 200 can also be connected to the condenser assembly 100 via a pipeline through the control component 300. Thus, when the control component 300 is switched to water recovery mode, it controls the exhaust gas from the exhaust section 10 to flow into the condenser assembly 100, where it is cooled into water and then flows into the water storage unit 200 for use in washing, wiping the vehicle, and wheel hub spraying. When the control component 300 is switched to heat recovery mode, it controls the exhaust gas from the exhaust section 10 to flow into the condenser assembly 100, heating the air surrounding the condenser assembly 100 for heating the passenger cabin and performing thermal management of the battery.

[0061] It is understandable that, compared to the existing technology that directly discharges water vapor and heat from exhaust gas into the atmosphere, the exhaust gas recovery device provided in this application recovers and reuses water and heat from hydrogen fuel cell exhaust gas on demand. The recovered water and heat can be utilized, reducing energy consumption, increasing vehicle range, and thus reducing resource waste.

[0062] Therefore, the exhaust gas recovery device provided in this embodiment includes a condensation component 100, a water storage component 200, and a control component 300. The control component 300 is connected to the exhaust section 10, the condensation component 100, and the water storage component 200 of the hydrogen fuel cell device, respectively. The control component 300 has at least a water recovery mode and a heat recovery mode. In the water recovery mode, the control component 300 controls the exhaust gas in the exhaust section 10 to flow into the condensation component 100 to cool it into water, which then flows into the water storage component 200. In the heat recovery mode, the control component 300 controls the exhaust gas in the exhaust section 10 to flow into the condensation component 100 to heat the air around the condensation component 100 for heating. That is, by recovering and utilizing the water and heat in the exhaust gas of the hydrogen fuel cell on demand, the waste of resources is reduced.

[0063] In one possible design, the control component 300 includes a controller 310, a first control valve 320, and a second control valve 330. The controller 310 is electrically connected to the first control valve 320 and the second control valve 330, respectively. The controller 310 has at least a water recovery mode and a heat recovery mode.

[0064] The first control valve 320 is connected between the exhaust section 10 and the condenser assembly 100, and the second control valve 330 is connected between the condenser assembly 100 and the water storage unit 200.

[0065] In water recovery mode, the controller 310 controls the first control valve 320 and the second control valve 330 to open, so that the exhaust gas in the exhaust section 10 is cooled into water by the condenser assembly 100 and flows into the water storage unit 200.

[0066] In heat recovery mode, controller 310 controls the first control valve 320 to open and the second control valve 330 to close, so that the exhaust gas in exhaust section 10 is heated by the condenser assembly 100 to provide heating to the surrounding air.

[0067] Specifically, such as Figure 1 As shown, the controller 310 is used to control the opening or closing of the first control valve 320 and the second control valve 330 respectively. For example, it is the main controller (HCU) of a hybrid power system, which is electrically connected to the first control valve 320 and the second control valve 330 respectively. The controller 310 has at least a water recovery mode and a heat recovery mode.

[0068] The first control valve 320 and the second control valve 330 can be electrically controlled valves such as solenoid valves. The first control valve 320 is connected between the exhaust section 10 and the condenser assembly 100, and is used to control the on / off state of the pipeline between the exhaust section 10 and the condenser assembly 100. The second control valve 330 is connected between the condenser assembly 100 and the water storage unit 200, and is used to control the on / off state of the pipeline between the condenser assembly 100 and the water storage unit 200.

[0069] With this configuration, when the controller 310 is switched to water recovery mode, the controller 310 controls both the first control valve 320 and the second control valve 330 to open, so that the exhaust gas in the exhaust section 10 is cooled into water by the condenser assembly 100 and flows into the water storage unit 200. When the controller 310 is switched to heat recovery mode, the controller 310 controls the first control valve 320 to open and the second control valve 330 to close, so that the exhaust gas in the exhaust section 10 is heated by the condenser assembly 100 to provide heating to the surrounding air.

[0070] It should be noted that the low-temperature exhaust gas after the condenser component 100 exchanges heat with the high-temperature exhaust gas can be directly discharged into the atmosphere or discharged through the exhaust section 10.

[0071] The specific models of the controller 310, the first control valve 320, and the second control valve 330 can be determined according to actual needs, and are not specifically limited in this embodiment.

[0072] Furthermore, in this embodiment, a detection element 210 is provided inside the water storage component 200. The detection element 210 is used to detect the water level in the water storage component 200 and is electrically connected to the controller 310.

[0073] In water recovery mode, when the water level in the water storage unit 200 is equal to or greater than the preset water level, the controller 310 controls at least the first control valve 320 to close.

[0074] Specifically, such as Figure 1 , Figure 2 As shown, the detection element 210 is used to detect the water level. It can be a float switch, a liquid level sensor, etc. The detection element 210 is installed inside the water storage element 200.

[0075] In this way, when the controller 310 is switched to water recovery mode, if the water level in the water storage container 200 is equal to or greater than the preset water level, the controller 310 will at least control the first control valve 320 to close, preventing excessive water from entering the water storage container 200 and causing water overflow. The preset water level can be determined according to the actual water storage needs, and is not specifically limited in this embodiment.

[0076] In some embodiments, the controller 310 also has a mixed recovery mode. In the mixed recovery mode, the controller 310 controls both the first control valve 320 and the second control valve 330 to open, and the exhaust gas in the exhaust section 10 flows into the condensation assembly 100 to cool into water and heat the air around the condensation assembly 100. The water flows into the water storage unit 200, and the heated air is used for heating.

[0077] In other words, the controller 310 also has a water and heat recovery mode. When the controller 310 is switched to the mixed recovery mode, the controller 310 controls the first control valve 320 and the second control valve 330 to open. The exhaust gas in the exhaust section 10 flows into the condenser assembly 100 to cool into water and heat the air around the condenser assembly 100. The water flows into the water storage unit 200, and the heated air is used for heating.

[0078] This allows for the simultaneous recycling of water resources and the use of that water for vehicle heating, meeting diverse needs. Furthermore, the ability to switch between three modes makes the recycling process more user-friendly.

[0079] Of course, the controller 310, the first control valve 320 and the second control valve 330 can also be replaced by manual control components, and this embodiment does not impose too many restrictions.

[0080] Furthermore, in this embodiment, a detection element 210 is provided inside the water storage component 200. The detection element 210 is used to detect the water level in the water storage component 200 and is electrically connected to the controller 310.

[0081] In the mixed recycling mode, when the water level in the water storage unit 200 is equal to or greater than the preset water level, the controller 310 controls the second control valve 330 to stop the water from flowing into the water storage unit 200 and drains away the water generated thereafter.

[0082] Specifically, such as Figure 1 , Figure 2 As shown, the detection element 210 is used to detect the water level, and it can be a float switch, a level sensor, etc. The detection element 210 is installed inside the water storage unit 200. The controller 310 is electrically connected to the detection element 210, and the controller 310 also has a mixed recovery mode.

[0083] In this way, when the controller 310 is switched to the mixed recycling mode, when the water level in the water storage container 200 is equal to or greater than the preset water level, the controller 310 controls the second control valve 330 to stop the flow of water into the water storage container 200, preventing excessive water from entering the water storage container 200 and causing water overflow, and draining away any subsequent water. The preset water level can be determined according to actual water storage needs, and is not specifically limited in this embodiment.

[0084] Furthermore, in this embodiment, the second control valve 330 is also used to connect to the exhaust section 10. In the mixed recovery mode, when the water level in the water storage unit 200 is equal to or greater than the preset water level, the controller 310 controls the second control valve 330 to discharge the subsequently generated water into the exhaust section 10.

[0085] With this configuration, the second control valve 330 can be connected to the exhaust section 10 via a pipeline, so that when the controller 310 is switched to the mixed recovery mode, the water generated afterward can be discharged into the exhaust section 10 and then discharged from the exhaust section 10, thus preventing the water from being discharged everywhere.

[0086] Furthermore, in this embodiment, the second control valve 330 is a three-way valve, and the three valve ports on the three-way valve are used to connect to the condensation assembly 100, the water storage component 200 and the exhaust section 10, respectively.

[0087] And / or, at least one of the first control valve 320 and the second control valve 330 is a solenoid valve.

[0088] Specifically, such as Figure 1 , Figure 2 As shown, the second control valve 330 is a three-way valve. The three ports of the three-way valve can be connected to the condenser assembly 100, the water storage unit 200, and the vent 10 respectively via pipelines. By selecting the on / off state of two of the three ports, the water flow direction can be switched, making the structure more compact. The specific model and specifications of the three-way valve can be determined according to actual design requirements; this embodiment does not impose specific limitations.

[0089] Furthermore, both the first control valve 320 and the second control valve 330 can be solenoid valves, which offer advantages such as fast response, accurate control, and high reliability, facilitating automated control. The specific models and specifications of the first control valve 320 and the second control valve 330 can be determined according to actual design requirements, and are not specifically limited in this embodiment.

[0090] In some embodiments, the condenser assembly 100 is also used to connect to the exhaust section 10 to exhaust the exhaust gas after passing through the condenser assembly 100.

[0091] This setting, such as Figure 1 As shown, the condenser assembly 100 can be connected to the exhaust section 10 through a pipeline, so that when the condenser assembly 100 is condensing or exchanging heat, the low-temperature exhaust gas or excess water generated can be discharged into the exhaust section 10 and then discharged from the exhaust section 10, so as not to cause random discharge everywhere.

[0092] Furthermore, in this embodiment, the condensation assembly 100 includes a condenser 110 and a fan 120, and the condenser 110 has an air inlet 111, a water outlet 112 and an exhaust outlet 113.

[0093] The air inlet 111 is connected to the first control valve 320, and the water outlet 112 is connected to the second control valve 330.

[0094] The exhaust port 113 is used to connect to the exhaust section 10, and the fan 120 blows air toward the condenser 110.

[0095] Specifically, such as Figure 1 As shown, the condenser 110 can be composed of multiple condenser tubes and fins, and has an air inlet 111, a water outlet 112 and an exhaust outlet 113. The air inlet 111 is connected to the front section of the exhaust section 10 via a first control valve 320, the water outlet 112 is connected to the water storage unit 200 via a second control valve 330, and the exhaust outlet 113 is connected to the rear section of the exhaust section 10.

[0096] It should be noted that the height of the exhaust port 113 must be greater than the height of the water outlet 112 to ensure that the low-temperature exhaust gas can be easily separated from the water.

[0097] Furthermore, the fan 120 can be installed on one side of the condenser 110, blowing air towards the condenser 110 to accelerate the airflow around the condenser 110 and promote efficient heat exchange. The specific models and specifications of the condenser 110 and fan 120 can be determined according to actual needs, and are not specifically limited in this embodiment.

[0098] Secondly, embodiments of this application also provide an exhaust gas recovery system, including a hydrogen fuel cell device and an exhaust gas recovery apparatus provided in any of the above embodiments. The hydrogen fuel cell device has an exhaust section 10, which is at least connected to a control component 300 in the exhaust gas recovery apparatus. This exhaust gas recovery system can be used in a hydrogen fuel cell device, which can be a hydrogen fuel cell vehicle, a hydrogen fuel cell stack, etc., and the exhaust section 10 can be an exhaust pipe.

[0099] The structure of the exhaust gas recovery device has been described in detail in the above embodiments and will not be repeated here.

[0100] The exhaust gas recovery system provided in this application embodiment includes an exhaust gas recovery device comprising a condensation assembly 100, a water storage unit 200, and a control assembly 300. The control assembly 300 is connected to the exhaust section 10, the condensation assembly 100, and the water storage unit 200 of the hydrogen fuel cell device. The control assembly 300 has at least a water recovery mode and a heat recovery mode. In the water recovery mode, the control assembly 300 controls the exhaust gas in the exhaust section 10 to flow into the condensation assembly 100 to cool it into water, which then flows into the water storage unit 200. In the heat recovery mode, the control assembly 300 controls the exhaust gas in the exhaust section 10 to flow into the condensation assembly 100 to heat the air around the condensation assembly 100 for heating. In other words, by recovering and utilizing the water and heat in the hydrogen fuel cell exhaust gas as needed, resource waste is reduced.

[0101] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0102] It should be understood that this application is not limited to the precise structures described above and shown in the appendix, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A device for recovering exhaust gas, characterized by comprising: The application relates to a hydrogen fuel cell system, which comprises: a condensing assembly; a water storage device; a control assembly, which is connected with an exhaust part of a hydrogen fuel cell device, the condensing assembly and the water storage device respectively, and has at least a water recovery mode and a heat recovery mode; in the water recovery mode, the control assembly controls the exhaust gas in the exhaust part to flow into the condensing assembly to be cooled into water and then flow into the water storage device; in the heat recovery mode, the control assembly controls the exhaust gas in the exhaust part to flow into the condensing assembly to heat the air around the condensing assembly and then be used for heating.

2. The apparatus according to claim 1, wherein The control assembly comprises a controller, a first control valve and a second control valve, the controller is electrically connected with the first control valve and the second control valve respectively, and the controller has at least the water recovery mode and the heat recovery mode; the first control valve is used for being connected between the exhaust part and the condensing assembly, and the second control valve is connected between the condensing assembly and the water storage device; in the water recovery mode, the controller controls the first control valve and the second control valve to be opened, so that the exhaust gas in the exhaust part is cooled into water through the condensing assembly and then flows into the water storage device; in the heat recovery mode, the controller controls the first control valve to be opened and the second control valve to be closed, so that the exhaust gas in the exhaust part is heated to heat the air around the condensing assembly and then be used for heating.

3. The apparatus according to claim 2, wherein The water storage device is provided with a detection device for detecting the water level in the water storage device and being electrically connected with the controller; in the water recovery mode, when the water level in the water storage device is equal to or greater than a preset water level, the controller controls the first control valve to be closed.

4. The apparatus according to claim 2, wherein The controller also has a mixed recovery mode, in which the controller controls the first control valve and the second control valve to be opened, so that the exhaust gas in the exhaust part flows into the condensing assembly to be cooled into water and heated to heat the air around the condensing assembly, the water flows into the water storage device, and the heated air is used for heating.

5. The apparatus according to claim 4, wherein The water storage device is provided with a detection device for detecting the water level in the water storage device and being electrically connected with the controller; in the mixed recovery mode, when the water level in the water storage device is equal to or greater than a preset water level, the controller controls the second control valve to stop the water from flowing into the water storage device and to discharge the subsequently generated water.

6. The apparatus for recovering tail gas according to claim 5, wherein The second control valve is also used for being connected with the exhaust part, in the mixed recovery mode, when the water level in the water storage device is equal to or greater than the preset water level, the controller controls the second control valve to discharge the subsequently generated water into the exhaust part.

7. The apparatus of claim 6, wherein, The second control valve is a three-way valve, and three valve ports on the three-way valve are used for being connected with the condensing assembly, the water storage device and the exhaust part respectively; and / or, at least one of the first control valve and the second control valve is an electromagnetic valve.

8. The apparatus of any one of claims 2 to 7, wherein, The condensing assembly is also used for being connected with the exhaust part to discharge the exhaust gas after the condensing assembly.

9. The apparatus of claim 8, wherein, The condensing assembly comprises a condenser and a fan, the condenser is provided with an air inlet, a water outlet and an exhaust outlet; The air inlet is connected with the first control valve, and the water outlet is connected with the second control valve; The exhaust outlet is used for being connected with the exhaust part, and the fan blows air towards the condenser.

10. A system for recovering exhaust gas, characterized by, The hydrogen fuel cell equipment is provided with an exhaust part, and the exhaust part is connected with at least the control assembly in the tail gas recovery device.

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