A waste heat recovery device for SOFC combined heat and power units

Abstract

This utility model discloses a waste heat recovery device for an SOFC (SOFC) combined heat and power plant, relating to the field of waste heat recovery technology. It includes a main body comprising a housing and a support frame. The housing is fixed to the top of the support frame. An inlet pipe and an outlet pipe are fixed to both sides of the housing and are connected. A frame is fixed to the inner wall of the housing, and heat exchange tubes are fixed to the inner wall of the frame. Both ends of the heat exchange tubes penetrate one side of the housing. This utility model, through the cooperation of a first three-way pipe and a partition, divides the heat exchange tubes into two independent channels, enabling simultaneous heat exchange of two media, adapting to multi-media waste heat recovery scenarios. Simultaneously, a detachable second three-way pipe and a matching positioning mechanism are added, allowing for simple connection or separation of the second three-way pipe from the first three-way pipe, switching to a single-media heat exchange mode without replacing the entire heat exchange equipment. This significantly improves the versatility and applicability of the device, while greatly reducing equipment costs and space occupation.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a waste heat recovery device for an SOFC combined heat and power unit. Background Technology

[0002] The waste heat recovery device of an SOFC combined heat and power unit recovers waste heat (such as 50-80℃ hot water or 100-200℃ high-temperature gas) generated during fuel cell power generation through equipment such as plate heat exchangers, heat pipes, finned tube heat exchangers or heat exchangers, and converts it into usable thermal energy for heating, hot water supply or driving absorption refrigeration systems, so as to achieve cascaded utilization of energy and overall efficiency improvement.

[0003] However, in practical applications, there are still some unresolved issues. The following are some common problems of waste heat recovery devices in SOFC cogeneration units: The heat exchange tube structure of existing finned tube heat exchangers is fixed and can only be adapted to heat exchange operations of a single medium. It cannot meet the needs of heat exchange of two media separately in multiple scenarios, resulting in extremely poor versatility and limited applicability. Furthermore, in scenarios where waste heat needs to be recovered from multiple media separately, multiple sets of heat exchange equipment need to be added, leading to increased equipment investment costs and expanded space occupation. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the problems existing in the waste heat recovery device of the above and / or existing SOFC cogeneration unit, this utility model is proposed.

[0006] Therefore, the problem to be solved by this utility model is how to solve the problem that the heat exchange tube structure of the existing finned tube heat exchanger is fixed, which can only be adapted to the heat exchange operation of a single medium and cannot meet the use needs of heat exchange of two media separately in multiple scenarios. It has extremely poor versatility and limited scope of application. Moreover, in scenarios where it is necessary to recover waste heat from multiple media separately, multiple sets of heat exchange equipment need to be added, which leads to increased equipment investment costs and increased space occupation.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a waste heat recovery device for an SOFC combined heat and power unit, comprising a main body, the main body including a box and a support, the box being fixed to the top of the support, an inlet pipe and an outlet pipe respectively fixed on both sides of the box and connected thereto, a frame fixed to the inner wall of the box, a heat exchange tube fixed to the inner wall of the frame, both ends of the heat exchange tube penetrating one side of the box, a first tee pipe fixed to one end of the heat exchange tube, the inner wall of the heat exchange tube and the inner wall of one end of the first tee pipe being welded to the same partition, the heat exchange tube and the first tee pipe being divided into two channels by the partition, and a second tee pipe being detachably installed on one side of the box.

[0008] A positioning mechanism is provided on the surface of the second tee pipe, including a concave cylinder and a support plate. The concave cylinder is fixed to the surface of the second tee pipe, and the support plate is located at one end of the concave cylinder.

[0009] As a preferred embodiment of the waste heat recovery device of the SOFC combined heat and power unit of this utility model, the positioning mechanism further includes an adjusting plate, the outer side of the adjusting plate is slidably connected to the inner wall of the concave cylinder, one end of the adjusting plate is fixedly connected to one end of the support plate, and a fixing member is provided on the surface of the first tee pipe.

[0010] As a preferred embodiment of the waste heat recovery device of the SOFC combined heat and power unit of this utility model, the fixing member includes a frame fixed to the surface of the first tee pipe, and one end of the support plate is inserted into the frame.

[0011] As a preferred embodiment of the waste heat recovery device of the SOFC combined heat and power unit of this utility model, the top of the frame is fixed with a frame body, and the surfaces of the frame body and the frame body are provided with round holes. The inner walls of the two round holes are slidably connected with the same insertion rod. One end surface of the support plate is provided with a first slot, and the bottom end of the insertion rod is inserted into the first slot.

[0012] As a preferred embodiment of the waste heat recovery device of the SOFC combined heat and power unit of this utility model, the surface of the insertion rod is fixedly fitted with a ring, and a spring is fitted on the insertion rod, with the two ends of the spring respectively abutting against the side of the frame and the ring that are close to each other.

[0013] As a preferred embodiment of the waste heat recovery device of the SOFC combined heat and power unit of this utility model, a support block is fixed on one side of the ring, a notch is opened on the surface of the frame, and one end of the support block is inserted into the notch.

[0014] As a preferred embodiment of the waste heat recovery device of the SOFC combined heat and power unit of this utility model, the top inner wall of the frame is fixed with a baffle for limiting the height of the ring.

[0015] As a preferred embodiment of the waste heat recovery device of the SOFC combined heat and power unit of this utility model, the concave cylinder has movable holes on both sides, a movable block is slidably connected in the movable hole, one side of the movable block is slidably connected to the surface of the adjusting plate, a wing screw is threaded on the concave cylinder, and a second slot and a third slot are respectively opened at both ends of the adjusting plate.

[0016] As a preferred embodiment of the waste heat recovery device of the SOFC combined heat and power unit described in this utility model, flanges are welded to both ends of the first tee pipe and the three ends of the second tee pipe, and the two flanges are fixedly connected by bolts and nuts.

[0017] As a preferred embodiment of the waste heat recovery device of the SOFC combined heat and power unit of this utility model, the heat exchange tube is fixed with fins on its surface, and the top and bottom of the fins are fixed to the top inner wall and bottom inner wall of the frame, respectively.

[0018] The beneficial effects of this utility model are as follows: by cooperating with the first three-way pipe and the partition, the heat exchange tube is divided into two independent channels, which can directly realize the synchronous heat exchange of two media and is suitable for multi-media waste heat recovery scenarios; at the same time, a detachable second three-way pipe and a matching positioning mechanism are added, which can complete the docking or separation of the second three-way pipe and the first three-way pipe through simple operation, and switch to a single-media heat exchange mode without replacing the entire heat exchange equipment, which greatly improves the versatility and applicability of the device, while significantly reducing equipment costs and space occupation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the main structure of the waste heat recovery device in an SOFC (Solar-Fired Combined Heat and Power) system.

[0021] Figure 2 This is a side view of the waste heat recovery unit of an SOFC (Solar-Fired Combined Heat and Power) system.

[0022] Figure 3 This is a cross-sectional structural diagram of the waste heat recovery unit of an SOFC (Solar-Fired Combined Heat and Power) system.

[0023] Figure 4 This is a partial structural diagram of the waste heat recovery device in an SOFC (Solar-Fired Combined Heat and Power) system.

[0024] Figure 5 This is a schematic diagram of the structure of the second tee pipe and the first tee pipe in the separated state of the waste heat recovery device of the SOFC cogeneration unit.

[0025] Figure 6 This is a schematic diagram of the fixture structure for the waste heat recovery device of an SOFC (Solar-Fuel Combined Heat and Power) unit.

[0026] Figure 7 This is a cross-sectional schematic diagram of the first tee pipe and heat exchanger pipe of the waste heat recovery device of an SOFC combined heat and power unit.

[0027] In the diagram: 1. Main body; 11. Box body; 12. Support; 13. Inlet pipe; 14. Outlet pipe; 15. First tee pipe; 16. Heat exchange pipe; 161. Baffle plate; 17. Fin; 18. Frame; 2. Second tee pipe; 3. Positioning mechanism; 31. Support plate; 32. Adjusting plate; 33. Concave cylinder; 34. Moving hole; 35. Wing screw; 4. Fixing component; 41. Frame body; 42. Frame body; 43. Notch; 44. Baffle plate; 45. Ring; 46. Support block; 47. Insert rod. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0031] Example 1, referring to Figures 1-2This is the first embodiment of the present invention. This embodiment provides a waste heat recovery device for an SOFC combined heat and power plant, including a main body 1. The main body 1 includes a box 11 and a support 12. The box 11 is fixed to the top of the support 12. An inlet pipe 13 and an outlet pipe 14 are fixed on both sides of the box 11 and are connected to each other. A frame 18 is fixed to the inner wall of the box 11. A heat exchange pipe 16 is fixed to the inner wall of the frame 18. Both ends of the heat exchange pipe 16 penetrate one side of the box 11. A first tee pipe 15 is fixed to one end of the heat exchange pipe 16. The same partition 161 is welded to the inner wall of the heat exchange pipe 16 and the inner wall of one end of the first tee pipe 15. The heat exchange pipe 16 and the first tee pipe 15 are divided into two channels by the partition 161. A second tee pipe 2 is detachably installed on one side of the box 11.

[0032] The positioning mechanism 3 is disposed on the surface of the second three-way pipe 2 and includes a concave cylinder 33 and a support plate 31. The concave cylinder 33 is fixed to the surface of the second three-way pipe 2, and the support plate 31 is located at one end of the concave cylinder 33.

[0033] The housing 11 is used to contain and guide the high-temperature exhaust gas discharged from the SOFC system. The exhaust gas flows in from the inlet pipe 13, flows through the outside of the heat exchange tube 16 for heat exchange, and then flows out from the outlet pipe 14. The design of the partition 161 makes the heat exchange tube 16 and the first tee pipe 15 form two independent channels, so that in the basic state, the two media can pass through in parallel and exchange heat with the exhaust gas. The second tee pipe 2 and the positioning mechanism 3 on it are spare parts prepared for the device to switch to a single medium, high flow rate working mode.

[0034] Specifically, the positioning mechanism 3 also includes an adjusting plate 32, the outer side of which is slidably connected to the inner wall of the concave cylinder 33, one end of which is fixedly connected to one end of the support plate 31, and a fixing member 4 is provided on the surface of the first three-way pipe 15.

[0035] The adjusting plate 32 is fixedly connected to the support plate 31 and can slide inside the concave cylinder 33, so that the extension length of the support plate 31 is adjustable, making it easy to store the second tee pipe 2 when not in use, or to adjust it to a suitable length for installation when in use. The fixing piece 4 set on the first tee pipe 15 is used to cooperate with the support plate 31 to realize the quick positioning and temporary fixing of the second tee pipe 2.

[0036] Specifically, the fastener 4 includes a frame 41 fixed to the surface of the first tee pipe 15, and one end of the support plate 31 is inserted into the frame 41.

[0037] When the second tee pipe 2 needs to be installed, simply align the support plate 31 on it and insert it into the frame 41. This insertion action physically guides the second tee pipe 2 to a preset position close to the first tee pipe 15, providing a basis for subsequent flange alignment, and also facilitating the installation of bolts and nuts.

[0038] Specifically, a frame 42 is fixed to the top of the frame 41. Both the frame 42 and the frame 41 have round holes on their surfaces. The inner walls of the two round holes are slidably connected to the same insert rod 47. A first slot is opened on one end of the support plate 31, and the bottom end of the insert rod 47 is inserted into the first slot.

[0039] After the support plate 31 is inserted into the frame 41, the first slot on the support plate 31 will be aligned with the insertion rod 47 that passes through the frame 41 and the frame 42. At this time, the insertion rod 47 is operated so that its bottom end is inserted into the first slot, thereby locking the support plate 31 in the frame 41, thus completing the temporary fixation of the second tee pipe 2 and keeping it in a stable position when installing the flange bolts.

[0040] Specifically, a ring 45 is fixedly sleeved on the surface of the insertion rod 47, and a spring is sleeved on the insertion rod 47. The two ends of the spring abut against the sides of the frame 42 and the ring 45 that are close to each other.

[0041] The spring is normally in a compressed or stored state, providing a downward elastic force to the insertion rod 47. When it is necessary to lock the support plate 31, this elastic force can automatically drive the insertion rod 47 downward to insert into the first slot. When it is necessary to unlock, the spring force must be overcome to pull the insertion rod 47 upward. The spring ensures that the locking action is completed automatically and the locked state is maintained.

[0042] The working principles and other aspects of this section are all existing technologies, which are clearly understood by those skilled in the art, and will not be elaborated upon here.

[0043] Example 2, refer to Figures 1-7 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0044] Specifically, a support block 46 is fixed to one side of the ring 45, and a notch 43 is opened on the surface of the frame 42, with one end of the support block 46 inserted into the notch 43.

[0045] When the insert rod 47 is pulled upward and rotated at a certain angle, so that the support block 46 is inserted into the notch 43, the insert rod 47 is restricted to the lifted position and cannot be moved downward, thus facilitating the removal or insertion of the support plate 31.

[0046] Specifically, a baffle 44 is fixed to the top inner wall of the frame 42 to limit the height of the ring 45.

[0047] The baffle 44 limits the highest position of the insertion rod 47 when it is pulled up. When the insertion rod 47 is pulled up so that the ring 45 contacts the baffle 44, the bottom end of the insertion rod 47 is completely disengaged from the first slot of the support plate 31, and at this time the support block 46 is rotated to the position aligned with the notch 43, so that it can be easily inserted.

[0048] Specifically, both sides of the concave cylinder 33 are provided with movable holes 34, and movable blocks are slidably connected in the movable holes 34. One side of the movable block is slidably connected to the surface of the adjusting plate 32. A wing screw 35 is threaded on the concave cylinder 33, and a second slot and a third slot are provided at both ends of the adjusting plate 32, respectively.

[0049] The movable block and movable hole 34 cooperate to guide and limit the sliding trajectory of the adjusting plate 32, so that it can extend and retract smoothly. The wing screw 35 is used as a length locking element. When the support plate 31 needs to extend to connect the fixing element 4, the adjusting plate 32 is pulled out until the wing screw 35 is aligned with the third slot, and the screw is tightened so that its end is inserted into the slot to fix it. When it needs to be stored, the adjusting plate 32 is pushed back so that the wing screw 35 is aligned with the second slot and tightened to fix it.

[0050] Specifically, flanges are welded to both ends of the first tee pipe 15 and the three ends of the second tee pipe 2, and the two flanges are fixedly connected by bolts and nuts.

[0051] When it is necessary to switch to the single medium high flow mode, the two flanges of the second tee pipe 2 and the two flanges of the first tee pipe 15 are fastened together with bolts and nuts. The single medium enters from the confluence end of the second tee pipe 2, and after merging through the first tee pipe 15, it flows through the entire cross section of the heat exchange tube 16 to achieve high flow heat exchange.

[0052] Specifically, fins 17 are fixed to the surface of the heat exchange tube 16, and the top and bottom of the fins 17 are fixed to the top inner wall and bottom inner wall of the frame 18, respectively.

[0053] The fins 17 significantly increase the heat exchange surface area between the heat exchange tube 16 and the high-temperature exhaust gas inside the housing 11, greatly improving the heat exchange efficiency.

[0054] When heat exchange between two media is required, the two external media are connected to the flanges at both ends of the first tee pipe 15 through pipes (by bolts and nuts). The high-temperature exhaust gas discharge pipe of SOFC is connected to the inlet pipe 13 (using flange installation). The external discharge pipe is then connected to the outlet pipe 14 (also using flange connection) and then used.

[0055] Two media (e.g., water) are diverted through the first three-way pipe 15 to the two channels of the heat exchange tube 16. The high-temperature exhaust gas discharged from the SOFC enters the interior of the housing 11 through the inlet pipe 13, flows through the heat exchange tube 16 and the area around the fins 17, and transfers heat to the media in the housing 11 through the pipe wall and the fins 17. The media is then discharged from the other end of the heat exchange tube 16, while the high-temperature exhaust gas flows out from the outlet pipe 14, thus realizing waste heat recovery.

[0056] When heat exchange is required for a single medium, first rotate the wing screw 35 so that the bottom end of the wing screw 35 is away from the current second slot. Then, pull the support plate 31 outward by hand. The support plate 31 drives the adjusting plate 32 to slide inside the concave cylinder 33. The adjusting plate 32 drives the moving block to slide in the moving hole 34. When the moving block can no longer be pulled, the wing screw 35 is aligned with the third slot. Rotate the wing screw 35 so that the bottom end of the wing screw 35 is inserted into the third slot for fixing.

[0057] Then, take the second three-way pipe 2, align the support plate 31 with the frame 41 and insert it. During the insertion process, both ends of the second three-way pipe 2 will gradually approach the first three-way pipe 15. When the support plate 31 is inserted into place, the insertion rod 47 will be aligned with the first slot of the support plate 31. At the same time, the flange of the second three-way pipe 2 will be aligned with the flange of the first three-way pipe 15. Then, rotate the insertion rod 47. The insertion rod 47 will drive the ring 45 and the support block 46 to rotate, so that the support block 46 leaves the notch 43. At this time, the compressed spring will be released, pushing the ring 45 and the insertion rod 47 to move down and insert into the first slot to fix the support plate 31. At this time, the bolts and nuts can be taken out to fix the flanges of the first three-way pipe 15 and the second three-way pipe 2. The flanges have sealing rings. The positioning mechanism 3 is made of metal and has a certain strength, which can support the second three-way pipe 2.

[0058] After the second tee pipe 2 is installed, heat can be transported to the heat exchange tube 16 through the second tee pipe 2 and the first tee pipe 15 for heat exchange. The setting of the second tee pipe 2 can increase the flow rate of the heat exchange tube 16, and heat exchange is no longer transported through a single channel.

[0059] When it is necessary to release the fixation of the support plate 31, pull the insertion rod 47 upward. The movement of the insertion rod 47 causes the ring 45 and the support block 46 to move upward. The bottom end of the insertion rod 47 leaves the first slot. When the insertion rod 47 can no longer be pulled upward, the baffle 44 abuts against the ring 45 (aligned with the notch 43 by the support block 46). Then rotate the insertion rod 47. The insertion rod 47 drives the support block 46 to rotate, so that the support block 46 is inserted into the notch 43 of the frame 42, thereby releasing the fixation of the support plate 31.

[0060] Because the support plate 31, the concave cylinder 33 and the adjusting plate 32 are adjustable, the length of the support plate 31 can be adjusted, and it can be stored when the support plate 31 is not in use.

[0061] The material and specifications of the springs can be selected according to actual needs.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A waste heat recovery device for an SOFC (Solar-Fired Combined Heat and Power) system, characterized in that: include, The main body (1) includes a box (11) and a support (12). The box (11) is fixed to the top of the support (12). An inlet pipe (13) and an outlet pipe (14) are fixed on both sides of the box (11) and are connected to each other. A frame (18) is fixed to the inner wall of the box (11). A heat exchange tube (16) is fixed to the inner wall of the frame (18). Both ends of the heat exchange tube (16) penetrate one side of the box (11). A first three-way pipe (15) is fixed to one end of the heat exchange tube (16). The inner wall of the heat exchange tube (16) and the inner wall of one end of the first three-way pipe (15) are welded with the same partition (161). The heat exchange tube (16) and the first three-way pipe (15) are divided into two channels by the partition (161). A second three-way pipe (2) is detachably installed on one side of the box (11). The positioning mechanism (3) is set on the surface of the second three-way pipe (2), including a concave cylinder (33) and a support plate (31). The concave cylinder (33) is fixed on the surface of the second three-way pipe (2), and the support plate (31) is located at one end of the concave cylinder (33). Flanges are welded to both ends of the first three-way pipe (15) and the three ends of the second three-way pipe (2). The two flanges are fixedly connected by bolts and nuts.

2. The waste heat recovery device of the SOFC combined heat and power unit as described in claim 1, characterized in that: The positioning mechanism (3) also includes an adjusting plate (32), the outer side of which is slidably connected to the inner wall of the concave cylinder (33), one end of which is fixedly connected to one end of the support plate (31), and a fixing member (4) is provided on the surface of the first three-way pipe (15).

3. The waste heat recovery device of the SOFC combined heat and power unit as described in claim 2, characterized in that: The fastener (4) includes a frame (41) fixed to the surface of the first tee pipe (15), and one end of the support plate (31) is inserted into the frame (41).

4. The waste heat recovery device of the SOFC combined heat and power unit as described in claim 3, characterized in that: The top of the frame (41) is fixed with a frame (42). Both the frame (42) and the frame (41) have round holes on their surfaces. The inner walls of the two round holes are slidably connected to the same insert rod (47). One end of the support plate (31) has a first slot. The bottom end of the insert rod (47) is inserted into the first slot.

5. The waste heat recovery device of the SOFC combined heat and power unit as described in claim 4, characterized in that: A ring (45) is fixedly sleeved on the surface of the insertion rod (47), and a spring is sleeved on the insertion rod (47). The two ends of the spring abut against the sides of the frame (42) and the ring (45) that are close to each other.

6. The waste heat recovery device of the SOFC combined heat and power unit as described in claim 5, characterized in that: A support block (46) is fixed on one side of the ring (45), and a notch (43) is opened on the surface of the frame (42). One end of the support block (46) is inserted into the notch (43).

7. The waste heat recovery device of the SOFC combined heat and power unit as described in claim 6, characterized in that: The top inner wall of the frame (42) is fixed with a baffle (44) for limiting the height of the ring (45).

8. The waste heat recovery device of the SOFC combined heat and power unit as described in claim 2, characterized in that: The concave cylinder (33) has movable holes (34) on both sides. A movable block is slidably connected in the movable hole (34). One side of the movable block is slidably connected to the surface of the adjusting plate (32). A wing screw (35) is threaded on the concave cylinder (33). A second slot and a third slot are respectively opened at both ends of the adjusting plate (32).

9. The waste heat recovery device of the SOFC combined heat and power unit as described in claim 1, characterized in that: The surface of the heat exchange tube (16) is fixed with fins (17), and the top and bottom of the fins (17) are fixed to the top inner wall and bottom inner wall of the frame (18), respectively.

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