Solid oxide fuel stack exhaust device

Abstract

The utility model relates to the technical field of fuel cells, in particular to an exhaust device of a solid oxide fuel stack, which comprises a gas collecting pipe, a gas outlet pipe, a connecting component and a gas outlet branch pipe, one end of the gas collecting pipe is sealed, and the other end of the gas collecting pipe is communicated with the gas outlet pipe through the connecting component; a plurality of first air outlet holes are formed in the two sides of the air collecting pipe, the air outlet branch pipes are arranged on the first air outlet holes and communicated with the interior of the air collecting pipe, a plurality of second air outlet holes are distributed in the length direction of the air outlet branch pipes, and the ends, away from the first air outlet holes, of the air outlet branch pipes are sealed. The utility model aims to solve the problem of non-uniform diffusion of air flow in a solid oxide fuel cell stack core group.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, and in particular to an exhaust 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; solid oxide fuel cell stack refers to stacking multiple SOFC units to form an integral structure to increase output power and current density. With the development of SOFC technology, SOFC products are gradually evolving towards high power, high density, and multi-core group combinations; when the core group of the solid oxide fuel cell stack is actually in operation, the air in the core group is quickly discharged from the stack after the reaction. Due to the unreasonable design of the gas channel inside the core group, the gas is obstructed during transmission or the air flow speed between different channels is inconsistent, which leads to the problem of uneven air flow diffusion. In order to reduce the mutual interference of airflows in each core group and improve the uniformity of airflow in the core group, we propose a solid oxide fuel cell stack exhaust device. Utility Model Content

[0003] The utility model aims to provide a solid oxide fuel cell stack exhaust device to solve the problem of uneven airflow diffusion inside a solid oxide fuel cell stack core group.

[0004] To achieve the above-mentioned purpose, the utility model provides a solid oxide fuel cell stack exhaust device, including an air collecting pipe, an air outlet pipe, a connecting assembly and an air outlet branch pipe, one end of the air collecting pipe is sealed, and the other end of the air collecting pipe is connected to the air outlet pipe through the connecting assembly, a plurality of first air outlet holes are provided on both sides of the air collecting pipe, the air outlet branch pipe is provided on the first air outlet holes and is connected to the interior of the air collecting pipe, a plurality of second air outlet holes are distributed in the length direction of the air outlet branch pipe, and the end of the air outlet branch pipe away from the first air outlet hole is sealed.

[0005] Furthermore, a plurality of the second air outlet holes are arranged at equal intervals along the length direction of the air outlet branch pipe.

[0006] Furthermore, the diameter of the first air outlet is greater than the diameter of the second air outlet.

[0007] Furthermore, the second air outlet holes at both ends of the air outlet branch pipe are arranged at intervals from the end of the air outlet branch pipe.

[0008] Furthermore, four first air outlet holes are respectively provided on both sides of the air collecting pipe and are symmetrically arranged, and six second air outlet holes are provided.

[0009] Furthermore, a partition is provided in the gas collecting pipe, and the partition is provided in the middle of the gas collecting pipe. The partition divides the upper and lower sides of the gas collecting pipe into gas storage chambers of the same size.

[0010] Furthermore, the partition is fixedly connected to the gas collecting pipe through a positioning plate, the positioning plate is arranged at the end of the gas collecting pipe, and two positioning plates are respectively arranged at both ends of the gas collecting pipe. The two positioning plates are arranged on the upper and lower sides of the partition and fixedly connected between the partition and the gas collecting pipe.

[0011] Furthermore, the gas collecting pipe is a rectangular straight-through pipe.

[0012] Furthermore, a first connecting plate is provided at one end of the gas collecting pipe away from the gas outlet pipe, the first connecting plate is fixedly connected to the gas collecting pipe, an extension portion is provided on one side of the first connecting plate, and a limiting hole is provided on the extension portion.

[0013] Furthermore, the connecting assembly includes a second connecting plate, a flange cover and a limiting ring, the second connecting plate is arranged at one end of the air collecting pipe close to the air outlet pipe and the second connecting plate is provided with a through hole matching the air outlet pipe, the flange cover is sleeved on the air outlet pipe, the limiting ring is sleeved on the air outlet pipe and the limiting ring is arranged on one side of the flange cover close to the second connecting plate.

[0014] The beneficial effects of the utility model include:

[0015] 1. The solid oxide fuel cell stack exhaust device provided by the utility model is provided with an outlet branch pipe on the gas collecting pipe, and a plurality of second outlet holes are provided on the outlet branch pipe. In actual use, the plurality of second outlet holes are aligned with the positions of the outlet holes on the core group. The second outlet holes form a certain back pressure when the core group exhausts, thereby making the air inside the core group diffuse more evenly. The air exhausted from the core group is collected into the gas collecting pipe through the outlet branch pipe, and then discharged to the outside of the stack through the outlet pipe. The uniformity of the airflow inside the core group is improved, the possibility of mutual interference of the airflows of each core group is reduced, and the overall efficiency and stability of the solid oxide fuel cell stack are improved. 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 structure of one side of a solid oxide fuel cell stack exhaust device provided in an embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the structure of the other side of the exhaust device for a solid oxide fuel cell stack provided in an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of a portion of the structure of a solid oxide fuel cell stack exhaust device provided in an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the internal structure of the gas collecting pipe provided in an embodiment of the utility model;

[0021] Figure 5 A schematic diagram of the structure of a second connecting plate provided in an embodiment of the utility model;

[0022] Icon: 100 - air collecting pipe, 110 - first air outlet, 120 - partition, 130 - positioning plate, 140 - first connecting plate, 141 - extension part, 142 - limiting hole, 200 - air outlet pipe, 210 - second connecting plate, 211 - through hole, 220 - flange cover, 230 - limiting ring, 300 - air outlet branch pipe, 310 - second air outlet. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] See also Figures 1 to 5As shown, the present disclosure provides a solid oxide fuel cell stack exhaust device, including a gas collecting pipe 100, an outlet pipe 200, a connecting assembly and an outlet branch pipe 300, one end of the gas collecting pipe 100 is sealed, and the other end of the gas collecting pipe 100 is connected to the outlet pipe 200 through the connecting assembly, and a plurality of first outlet holes 110 are arranged on both sides of the gas collecting pipe 100, and the outlet branch pipe 300 is arranged on the first outlet hole 110 and is connected to the inside of the gas collecting pipe 100, and a plurality of second outlet holes 310 are distributed in the length direction of the outlet branch pipe 300, and one end of the outlet branch pipe 300 away from the first outlet hole 110 is sealed; specifically, the outlet branch pipe 300 The outlet branch pipe 300 is welded to the gas collecting pipe 100. The diameter of the outlet branch pipe 300 should be smaller than that of the gas collecting pipe 100. The number of the outlet branch pipes 300 can be adjusted according to actual needs. A plurality of second outlet holes 310 are arranged in the length direction of the outlet branch pipe 300. In actual use, the positions of the second outlet holes 310 are aligned with the positions of the outlet holes on the core group. Each core group corresponds to two outlet branch pipes 300. The second outlet holes 310 form a certain back pressure when the core group exhausts, thereby making the air inside the core group diffuse more evenly. The air discharged from the core group is collected into the gas collecting pipe 100 through the outlet branch pipe 300, and then discharged to the outside of the fuel cell stack through the outlet pipe 200.

[0026] Preferably, a plurality of the second air outlet holes 310 are arranged at equal intervals along the length direction of the air outlet branch pipe 300, and the diameter of the first air outlet hole 110 is larger than the diameter of the second air outlet hole 310. A plurality of the second air outlet holes 310 are arranged at equal intervals along the length direction of the air outlet branch pipe 300 to ensure that the airflow can be uniformly discharged from the second air outlet holes 310, thereby reducing the unevenness of the airflow.

[0027] Preferably, the second air outlet holes 310 at both ends of the air outlet branch pipe 300 are spaced apart from the ends of the air outlet branch pipe 300, four first air outlet holes 110 are respectively disposed on both sides of the air collecting pipe 100 and are symmetrically disposed, and six second air outlet holes 310 are disposed; in this embodiment, the spaced apart arrangement between the second air outlet holes 310 and the ends of the air outlet branch pipe 300 can effectively prevent the liquid water in the air collecting pipe 100 from flowing back into the core group; the number of the first air outlet holes 110 and the second air outlet holes 310 can be adjusted according to the actual core group requirements;

[0028] Preferably, the gas collecting pipe 100 is further provided with a partition 120, the partition 120 is provided in the middle of the gas collecting pipe 100, the partition 120 divides the upper and lower sides of the gas collecting pipe 100 into gas storage chambers of the same size, the partition 120 is fixedly connected to the gas collecting pipe 100 through a positioning plate 130, the positioning plate 130 is provided at the end of the gas collecting pipe 100, and two positioning plates 130 are respectively provided at both ends of the gas collecting pipe 100, and the two positioning plates 130 are provided on the partition 12 0 and fixedly connected with the partition 120 and the gas collecting pipe 100, the gas collecting pipe 100 being a rectangular straight-through pipe; in this embodiment, the partition 120 is used to divide the space in the gas collecting pipe 100 into two gas storage chambers of the same size, and the positioning plate 130 is used to ensure that the partition 120 is firmly fixed in the gas collecting pipe 100, so as to isolate the first vent holes on the upper and lower sides of the gas collecting pipe 100, thereby avoiding the collision of the airflow on the upper and lower sides of the gas collecting pipe 100 and affecting the gas distribution of the core group;

[0029] Preferably, a first connecting plate 140 is provided at one end of the gas collecting pipe 100 away from the gas outlet pipe 200, and the first connecting plate 140 is fixedly connected to the gas collecting pipe 100, and an extension portion 141 is provided on one side of the first connecting plate 140, and a limiting hole 142 is provided on the extension portion 141; specifically, by providing the first connecting plate 140, the exhaust device is fixedly connected to the stack structure through the limiting hole 142 on the extension portion 141; the end of the gas collecting pipe 100 close to the first connecting plate 140 is in a closed state, and then the end of the gas collecting pipe 100 close to the first connecting plate 140 forms a closed cavity, and a small amount of condensed water generated by the gas collecting pipe 100 can be temporarily stored therein, so as to prevent the condensed water from flowing back to the core group along the gas outlet branch pipe 300 to damage the core group components; as the temperature of the solid oxide fuel cell stack increases, the water in the gas collecting pipe 100 becomes water vapor and can be discharged from the gas outlet pipe 200 together with the air, and there is no need to separately provide a condensing device for air outlet, which effectively simplifies the structure of the exhaust device;

[0030] Preferably, the connecting assembly includes a second connecting plate 210, a flange cover 220 and a limiting ring 230, the second connecting plate 210 is arranged at one end of the collecting pipe 100 close to the outlet pipe 200 and the second connecting plate 210 is provided with a through hole 211 matching the outlet pipe 200, the flange cover 220 is sleeved on the outlet pipe 200, the limiting ring 230 is sleeved on the outlet pipe 200 and the limiting ring 230 is arranged on one side of the flange cover 220 close to the second connecting plate 210; in this embodiment, the first connecting plate 140 can also be used as a connecting piece between the exhaust device and the stack structure, the limiting ring 230 is used in conjunction with the flange cover 220, and when the outlet pipe 200 passes through the stack sealing partition 120 to the outside of the stack, the limiting ring 230 and the flange cover 220 play a sealing role.

[0031] In addition to the above description, there are a few points to note:

[0032] (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;

[0033] (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.

[0034] 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 solid oxide fuel cell stack exhaust device, characterized in that: The invention comprises an air collecting pipe (100), an air outlet pipe (200), a connecting assembly and an air outlet branch pipe (300); one end of the air collecting pipe (100) is sealed, and the other end of the air collecting pipe (100) is connected to the air outlet pipe (200) through the connecting assembly; a plurality of first air outlet holes (110) are provided on both sides of the air collecting pipe (100); the air outlet branch pipe (300) is provided on the first air outlet holes (110) and is connected to the inside of the air collecting pipe (100); a plurality of second air outlet holes (310) are distributed in the length direction of the air outlet branch pipe (300); and one end of the air outlet branch pipe (300) away from the first air outlet hole (110) is sealed.

2. The exhaust device for a solid oxide fuel cell stack according to claim 1, characterized in that: A plurality of the second air outlet holes (310) are arranged at equal intervals along the length direction of the air outlet branch pipe (300).

3. The exhaust device for a solid oxide fuel cell stack according to claim 2, characterized in that: The diameter of the first air outlet hole (110) is greater than the diameter of the second air outlet hole (310).

4. The exhaust device for a solid oxide fuel cell stack according to claim 3, characterized in that: The second air outlet holes (310) at both ends of the air outlet branch pipe (300) are arranged at intervals between the ends of the air outlet branch pipe (300).

5. The exhaust device for a solid oxide fuel cell stack according to claim 4, characterized in that: Four first air outlet holes (110) are respectively provided on both sides of the air collecting pipe (100) and are symmetrically arranged, and six second air outlet holes (310) are provided.

6. The exhaust device for a solid oxide fuel cell stack according to any one of claims 1 to 5, characterized in that: A partition plate (120) is also provided in the gas collecting pipe (100), and the partition plate (120) is provided in the middle of the gas collecting pipe (100). The partition plate (120) divides the upper and lower sides of the gas collecting pipe (100) into gas storage chambers of the same size.

7. The exhaust device for a solid oxide fuel cell stack according to claim 6, characterized in that: The partition (120) is fixedly connected to the gas collecting pipe (100) via a positioning plate (130); the positioning plate (130) is arranged at the end of the gas collecting pipe (100); two positioning plates (130) are respectively arranged at both ends of the gas collecting pipe (100); the two positioning plates (130) are arranged at the upper and lower sides of the partition (120) and are fixedly connected to the partition (120) and the gas collecting pipe (100).

8. The exhaust device for a solid oxide fuel cell stack according to claim 7, characterized in that: The gas collecting pipe (100) is a rectangular straight-through pipe.

9. The exhaust device for a solid oxide fuel cell stack according to claim 8, characterized in that: A first connecting plate (140) is provided at one end of the gas collecting pipe (100) away from the gas outlet pipe (200); the first connecting plate (140) is fixedly connected to the gas collecting pipe (100); an extension portion (141) is provided on one side of the first connecting plate (140); and a limiting hole (142) is provided on the extension portion (141).

10. The exhaust device for a solid oxide fuel cell stack according to claim 9, characterized in that: The connection assembly comprises a second connection plate (210), a flange cover (220) and a limiting ring (230); the second connection plate (210) is arranged at one end of the gas collecting pipe (100) close to the gas outlet pipe (200), and the second connection plate (210) is provided with a through hole (211) matching the gas outlet pipe (200); the flange cover (220) is sleeved on the gas outlet pipe (200); the limiting ring (230) is sleeved on the gas outlet pipe (200), and the limiting ring (230) is arranged on one side of the flange cover (220) close to the second connection plate (210).

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