Water-gas separation device for solid oxide fuel stack
By designing a solid oxide fuel pile water-gas separation device, including gas collection pipe, air outlet branch pipe, air outlet pipe, filter net, water collection device and drainage device, the problem of condensate return to the core group is solved, and the fuel exhaust is effective Water-gas separation and safe discharge of condensate reduce the risk of failure.
Patent Information
- Application Number
- CN202420876125.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-25
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-04-25
AI Technical Summary
The existing water-gas separation device has the risk that condensate water can easily return to the core group during the fuel exhaust treatment process, resulting in problems such as short-circuiting the core group and device corrosion.
A solid oxide fuel pile water-gas separation device is designed, including a gas collecting pipe, an outlet branch pipe, an outlet pipe, a filter, a water collecting device and a drainage device. The condensate water is collected and stored through the water collecting device to prevent it from flowing back to the core. The condensate is finally discharged through the drainage device.
The water-gas separation of fuel exhaust gas is effectively realized, preventing condensate water from flowing back to the core group, and reducing the risk of failure of the fuel stack system.
Smart Images
Figure CN222440626U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fuel cells, in particular to a water-gas separation device for a solid oxide fuel cell stack. Background Art
[0002] Solid oxide fuel cell (SOFC) is a high-temperature electrochemical power generation device that uses solid oxide as an electrolyte to directly convert the chemical energy of fuel into electrical energy; a solid oxide fuel cell stack refers to a stack of multiple SOFC units to form an integral structure to increase output power and current density. With the development of SOFC technology, SOFC products have gradually evolved towards high power, high density, and multi-core group combinations; in the actual operation of solid oxide fuel cell stacks, it is usually necessary to recover the fuel tail gas and separate the water and gas; however, the existing water-gas separation device has the risk of condensed water easily flowing back into the core group during the treatment of fuel tail gas, which can easily lead to the problem of core group short circuit and device corrosion; for this reason, we propose a water-gas separation device for solid oxide fuel cell stacks. Utility Model Content
[0003] The utility model aims to provide a water-gas separation device for a solid oxide fuel cell stack, which is used to realize the recovery and water-gas separation of the fuel tail gas of the solid oxide fuel cell stack and prevent condensed water from flowing back into the core group.
[0004] To achieve the above-mentioned purpose, the utility model provides a water-gas separation device for a solid oxide fuel cell stack, comprising an air collecting pipe, an air outlet branch pipe, an air outlet pipe, a filter, a water collecting device and a drainage device, wherein the air outlet branch pipe is arranged on the side wall of the air collecting pipe and is connected to the interior of the air collecting pipe, the air outlet pipe is connected to the first output end of the air collecting pipe, the filter is arranged at one end of the air collecting pipe close to the air outlet pipe, the water collecting device is connected to the second output end of the air collecting pipe, and the drainage device is connected to the output end of the water collecting device.
[0005] Furthermore, the water collecting device includes a guide pipe and a water collecting tank, the input end of the guide pipe is connected to the second output end of the gas collecting pipe, and the output end of the guide pipe is connected to the water collecting tank.
[0006] Furthermore, a balancing pipe is provided on the water collecting tank, one end of the balancing pipe is connected to the air outlet pipe, and the other end of the balancing pipe is connected to the air outlet pipe.
[0007] Furthermore, the water collecting device also includes a liquid level switch, which is arranged on the water collecting tank. The liquid level switch is electrically connected to the drainage device, and the liquid level switch is used to detect the water level in the water collecting tank.
[0008] Furthermore, the drainage device includes a water pump and a drainage pipe, and the drainage pipe is connected to the output end of the water collecting tank through the water pump.
[0009] Furthermore, an extension pipe is provided at one end of the outlet branch pipe away from the air collecting pipe, and the extension pipe extends toward the outside of the outlet branch pipe.
[0010] Furthermore, two outlet branch pipes are spaced apart on both sides of the gas collecting pipe, and the outlet branch pipes on both sides of the gas collecting pipe are symmetrically arranged. The outlet branch pipes are fixedly connected to the gas collecting pipe through the through holes on the gas collecting pipe.
[0011] Furthermore, the outlet branch pipe is spaced apart from the end of the outlet pipe.
[0012] Furthermore, a sealing assembly is provided on the air outlet pipe, and the sealing assembly includes a sealing ring and a pressure cover. The sealing ring is sleeved on the air outlet pipe, and the pressure cover is provided on a side of the sealing ring away from the air collecting pipe and is threadedly connected to the air outlet pipe.
[0013] Furthermore, the outer surface of the end of the air outlet pipe away from the air collecting pipe is provided with threads.
[0014] The beneficial effects of the utility model include:
[0015] 1. The solid oxide fuel cell stack water-gas separation device provided by the utility model is provided with a gas collecting pipe, a gas outlet branch pipe, a gas outlet pipe, a filter screen and a water collecting device. In actual use, the fuel tail gas after reaction in the core group is discharged into the gas collecting pipe through the gas outlet branch pipe, the water vapor is condensed in the gas collecting pipe to form liquid water and then discharged into the water collecting device, and the hydrogen is discharged through the gas outlet pipe, thereby realizing the water-gas separation of the fuel tail gas; at the same time, the water collecting device can collect and store the condensed water to prevent the condensed water from being retained in the gas collecting pipe and flowing back to the core group, and finally the condensed water is discharged to the outside of the solid oxide fuel cell stack through the drainage device, and the gas is discharged to the outside of the solid oxide fuel cell stack through the gas outlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 A schematic diagram of the overall structure of a water-gas separation device for a solid oxide fuel cell stack provided in an embodiment of the utility model;
[0018] Figure 2 A schematic diagram of a portion of the structure of a water-gas separation device for a solid oxide fuel cell stack provided in an embodiment of the utility model;
[0019] Icons: 100-gas collecting pipe, 110-filter screen, 120-first output end, 130-second output end, 200-air outlet branch pipe, 210-extension pipe, 300-air outlet pipe, 310-sealing ring, 320-pressure cover, 400-water collecting tank, 410-flow guide pipe, 420-balance pipe, 430-liquid level switch, 500-water pump, 510-drain pipe. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present invention will be described below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0021] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0022] See also Figure 1 to Figure 2As shown, the present disclosure provides a water-gas separation device for a solid oxide fuel cell stack, comprising a gas collecting pipe 100, a gas outlet branch pipe 200, a gas outlet pipe 300, a filter screen 110, a water collecting device and a drainage device, wherein the gas outlet branch pipe 200 is arranged on the side wall of the gas collecting pipe 100 and is communicated with the interior of the gas collecting pipe 100, the gas outlet pipe 300 is connected to the first output end 120 of the gas collecting pipe 100, the filter screen 110 is arranged at one end of the gas collecting pipe 100 close to the gas outlet pipe 300, the water collecting device is connected to the second output end 130 of the gas collecting pipe 100, and the drainage device is connected to the output end of the water collecting device; specifically, the gas outlet branch pipe 200 is welded to the side wall of the gas collecting pipe 100, and the number of the gas outlet branch pipes 200 can be configured according to the number of core groups of the solid oxide fuel cell stack; the filter screen 110 is used to separate the gas from the gas collecting pipe 100, and the gas outlet branch pipe 200 can be ... 00 is filtered and separated, and the filter screen 110 is arranged on the cross section inside the gas collecting pipe 100 and is fixedly connected to the gas collecting pipe 100; in actual use, the fuel tail gas after the reaction in the core group is water vapor and a small amount of hydrogen. The fuel tail gas of each core group of the solid oxide fuel cell stack is discharged into the gas collecting pipe 100 through the outlet branch pipe 200, and the water vapor is condensed in the gas collecting pipe 100 to form liquid water and then discharged into the water collecting device, and the hydrogen is discharged to the outside of the solid oxide fuel cell stack through the outlet pipe 300; finally, the liquid water in the water collecting device is discharged to the outside of the solid oxide fuel cell stack through the drainage device, so as to complete the water-gas separation of the fuel tail gas of the solid oxide fuel cell stack. The design of the water collecting device and the drainage device effectively collects and discharges the condensed water, avoids the condensed water from flowing back to the core group, and reduces the failure risk of the fuel cell stack system;
[0023] Preferably, the water collecting device includes a guide pipe 410 and a water collecting tank 400, the input end of the guide pipe 410 is connected to the second output end 130 of the gas collecting pipe 100, and the output end of the guide pipe 410 is connected to the water collecting tank 400; the water collecting tank 400 is also provided with a balance pipe 420, one end of the balance pipe 420 is connected to the air outlet pipe 300, and the other end of the balance pipe 420 is connected to the water collecting tank 400; the water collecting device also includes a liquid level switch 430, the liquid level switch 430 is provided on the water collecting tank 400, the liquid level switch 430 is electrically connected to the drainage device, and the liquid level switch 430 is used to detect the water level in the water collecting tank 400; the guide pipe 410 is used to guide the condensed water into the water collecting tank 400, and the water collecting tank 400 is used to receive and store the condensed water in the gas collecting pipe 100; the balance pipe 420 connects the air outlet pipe 300 and the water collecting tank 400. The balance pipe 420 is provided to prevent the water collecting tank 400 from generating back pressure. A water seal is formed in the guide pipe 410 to ensure smooth drainage and avoid the problem of poor drainage of the air collecting pipe 100, thereby further preventing the liquid water from flowing back into the core group; the liquid level switch 430 is provided on the water collecting tank 400 and is electrically connected to the drainage device to detect the water level in the water collecting tank 400. When the water level reaches a certain height, the liquid level switch 430 will send a signal to start the drainage device to discharge the condensed water and keep the water level in the water collecting tank 400 within an appropriate range; in this embodiment, the connection design of the guide pipe 410, the balance pipe 420 and the water collecting tank 400 enables the condensed water to be effectively collected and stored, thereby reducing the risk of backflow.
[0024] Preferably, the drainage device includes a water pump 500 and a drainage pipe 510, and the drainage pipe 510 is connected to the output end of the water collecting tank 400 through the water pump 500; the water pump 500 is electrically connected to the liquid level switch 430, and a PLC controller can be used to control the start and stop of the water pump 500, and the drainage process is automatically controlled according to the signal of the liquid level switch 430. When the liquid level switch 430 detects that the water level in the water collecting tank 400 is too high, the liquid level switch 430 will send a signal to the PLC controller to start the water pump 500 to discharge the condensed water out of the system, so as to realize the automatic control of the drainage process, ensure that the condensed water is discharged in time, and maintain the normal operation of the system;
[0025] Preferably, an extension pipe 210 is provided at one end of the gas outlet branch pipe 200 away from the gas collecting pipe 100, and the extension pipe 210 extends to the outside of the gas outlet branch pipe 200. Two gas outlet branch pipes 200 are provided at intervals on both sides of the gas collecting pipe 100, respectively. The gas outlet branch pipes 200 on both sides of the gas collecting pipe 100 are symmetrically arranged, and the gas outlet branch pipes 200 are fixedly connected to the gas collecting pipe 100 through the through holes on the gas collecting pipe 100. The gas outlet branch pipes 200 are arranged at intervals from the end of the gas outlet pipe 300. By arranging the extension pipe 210 on the gas outlet branch pipe 200, it is convenient to dock with the gas outlet pipe on the core group of the solid oxide fuel cell stack. The purpose of arranging the gas outlet branch pipe 200 at intervals from the end of the gas outlet pipe 300 is to further prevent the liquid water in the gas collecting pipe 100 from flowing back into the core group.
[0026] Preferably, a sealing assembly is also provided on the gas outlet pipe 300, and the sealing assembly includes a sealing ring 310 and a pressure cap 320. The sealing ring 310 is sleeved on the gas outlet pipe 300, and the pressure cap 320 is arranged on the side of the sealing ring 310 away from the gas collecting pipe 100 and is threadedly connected to the gas outlet pipe 300. The outer surface of the end of the gas outlet pipe 300 away from the gas collecting pipe 100 is provided with threads; specifically, the sealing ring 310 is filled with sealing material. The purpose of setting the sealing assembly is that the gas outlet pipe 300 needs to discharge hydrogen to the outside of the solid oxide fuel cell stack. After the gas outlet pipe 300 passes through the sealed cavity of the solid oxide fuel cell stack, the sealing ring 310 is sleeved on the gas outlet pipe 300, and the pressure cap 320 is arranged on the side of the sealing ring 310 away from the gas collecting pipe 100 and is threadedly connected to the gas outlet pipe 300, so as to simplify the sealing structure of the gas outlet pipe 300 passing through the through hole of the sealed cavity, provide reliable sealing, and prevent gas leakage.
[0027] In addition to the above description, there are a few points to note:
[0028] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design;
[0029] (2) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.
[0030] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A water-gas separation device for a solid oxide fuel cell stack, characterized in that: The invention comprises an air collecting pipe (100), an air outlet branch pipe (200), an air outlet pipe (300), a filter (110), a water collecting device and a drainage device, wherein the air outlet branch pipe (200) is arranged on the side wall of the air collecting pipe (100) and is in communication with the interior of the air collecting pipe (100), the air outlet pipe (300) is connected to the first output end (120) of the air collecting pipe (100), the filter (110) is arranged at one end of the air collecting pipe (100) close to the air outlet pipe (300), the water collecting device is connected to the second output end (130) of the air collecting pipe (100), and the drainage device is connected to the output end of the water collecting device.
2. The solid oxide fuel cell stack water-gas separation device according to claim 1, characterized in that: The water collecting device comprises a flow guiding pipe (410) and a water collecting box (400), wherein the input end of the flow guiding pipe (410) is connected to the second output end (130) of the gas collecting pipe (100), and the output end of the flow guiding pipe (410) is connected to the water collecting box (400).
3. The solid oxide fuel cell stack water-gas separation device according to claim 2, characterized in that: The water collecting box (400) is also provided with a balancing pipe (420), one end of the balancing pipe (420) is connected to the water collecting box (400), and the other end of the balancing pipe (420) is connected to the air outlet pipe (300).
4. The solid oxide fuel cell stack water-gas separation device according to claim 3, characterized in that: The water collecting device further comprises a liquid level switch (430), which is arranged on the water collecting tank (400). The liquid level switch (430) is electrically connected to the drainage device, and the liquid level switch (430) is used to detect the water level in the water collecting tank (400).
5. The solid oxide fuel cell stack water-gas separation device according to claim 4, characterized in that: The drainage device comprises a water pump (500) and a drainage pipe (510), and the drainage pipe (510) is connected to the output end of the water collecting tank (400) through the water pump (500).
6. The solid oxide fuel cell stack water-gas separation device according to any one of claims 1 to 5, characterized in that: An extension pipe (210) is provided at one end of the outlet branch pipe (200) away from the gas collecting pipe (100), and the extension pipe (210) extends toward the outside of the outlet branch pipe (200).
7. The solid oxide fuel cell stack water-gas separation device according to claim 6, characterized in that: Two air outlet branch pipes (200) are respectively arranged at intervals on both sides of the air collecting pipe (100); the air outlet branch pipes (200) on both sides of the air collecting pipe (100) are arranged symmetrically; and the air outlet branch pipes (200) are fixedly connected to the air collecting pipe (100) via through holes on the air collecting pipe (100).
8. The solid oxide fuel cell stack water-gas separation device according to claim 7, characterized in that: The outlet branch pipe (200) and the end of the outlet pipe (300) are arranged at intervals.
9. The solid oxide fuel cell stack water-gas separation device according to claim 7, characterized in that: The outlet pipe (300) is also provided with a sealing assembly, which comprises a sealing ring (310) and a pressure cover (320). The sealing ring (310) is sleeved on the outlet pipe (300), and the pressure cover (320) is provided on a side of the sealing ring (310) away from the gas collecting pipe (100) and is threadedly connected to the outlet pipe (300).
10. The solid oxide fuel cell stack water-gas separation device according to claim 9, characterized in that: The outer surface of the end of the air outlet pipe (300) away from the air collecting pipe (100) is provided with threads.