Heat pipes and flue gas heat exchangers

Abstract

The present invention provides a heat pipe and a flue gas heat exchanger. The heat pipe is arranged in the flue gas heat exchanger. The end of the heat pipe is provided with a sealing part that seals the tube cavity of the heat pipe. The sealing part has a chamber. A diaphragm is arranged in the chamber. The diaphragm separates the chamber into a first chamber and a second chamber. The first chamber is connected to the tube cavity of the heat pipe. The second chamber can be filled with a flowing medium. The second chamber is also connected to a display tube. When the diaphragm deforms toward one side of the second chamber, the liquid level of the flowing medium in the display tube changes. The present invention can conduct online observation of the leakage of working fluid in the tube or the decrease of vacuum degree in the tube for multiple heat pipes, and can replace one or more leaking heat pipes or re-evacuate the heat pipe with decreased vacuum degree according to the observation results. It is not necessary to check all heat pipes. On the premise of improving the heat exchange effect of the flue gas heat exchanger and extending the service life of the flue gas heat exchanger, it can also improve the maintenance efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas recovery, energy saving and environmental protection, and in particular to a heat pipe and a flue gas heat exchanger. Background Art

[0002] The flue gas emission temperature of coal-fired power plants and non-electric high-energy consumption industries is relatively high. For the purpose of energy conservation and emission reduction, there are currently a variety of flue gas waste heat recovery devices. Among them, the low-temperature economizer is a typical tail flue gas waste heat recovery device in a coal-fired power plant. The low-temperature economizer is usually arranged at the outlet of the air preheater of a coal-fired power plant and before the electrostatic precipitator. It can cool the flue gas of about 120-150℃ to 90-100℃. The recovered flue gas waste heat can be used, for example, to heat the condensate of the low-pressure heating system, thereby displacing the turbine exhaust used to heat the feed water, reducing the steam consumption rate of the turbine and increasing energy utilization.

[0003] The existing low-temperature economizers mainly include shell and tube heat exchangers and phase change heat exchangers. Phase change heat exchangers generally use heat pipe heat exchangers, including multiple rows of heat pipes, which are evacuated and filled with phase change medium. In order to monitor the vacuum degree, multiple rows of heat exchange pipes are connected to each other and a vacuum pressure gauge is set for monitoring. Summary of the invention

[0004] The present invention provides a heat pipe, which is arranged in a flue gas heat exchanger, wherein a sealing portion for sealing a tube cavity of the heat pipe is arranged at an end of the heat pipe, the sealing portion has a chamber, a diaphragm is arranged in the chamber, the diaphragm separates the chamber into a first chamber and a second chamber, and the first chamber is communicated with the tube cavity of the heat pipe;

[0005] The second chamber can be filled with a flowing medium, and the second chamber is also connected to a display tube. When the diaphragm is deformed toward the second chamber, the liquid level of the flowing medium in the display tube changes.

[0006] Optionally, the sealing portion includes a first shell and a second shell that are interlocked to form the chamber, the diaphragm is fastened between the first shell and the second shell, and the display tube is connected to the outer side of the second shell and communicated to the inner side of the second shell to communicate with the second chamber.

[0007] Optionally, the sealing part includes a sealing joint, which seals and connects the end of the heat pipe, and a threaded hole is provided in the middle of the sealing joint; a threaded joint matching the threaded hole is provided on the outer side of the first shell, and a through flow hole is formed in the threaded joint, and one end of the flow hole is connected to the inner side of the first shell to connect to the first chamber. After the threaded joint is inserted into the sealing joint, the other end of the flow hole is connected to the tube cavity of the heat pipe.

[0008] Optionally, the display tube is a capillary tube.

[0009] Optionally, the heat pipe includes an evaporation tube section for exchanging heat with the flue gas, and a plurality of protruding pins are provided around the evaporation tube section.

[0010] Optionally, the heat pipe includes a condensing pipe section for exchanging heat with a cooling medium, and the end of the heat pipe where the sealing portion is arranged is close to the condensing pipe section.

[0011] The present invention also provides a flue gas heat exchanger, comprising a plurality of heat pipes as described in any one of the above items; the flue gas heat exchanger also comprises a plurality of sleeves corresponding one-to-one to the heat pipes and through which cooling medium can flow; the heat pipe comprises a condensing pipe section for exchanging heat with the cooling medium, and one of the sleeves is inserted into the condensing pipe section of each heat pipe.

[0012] Optionally, the flue gas heat exchanger comprises a plurality of first pipes arranged side by side and a plurality of second pipes arranged side by side, and a row of the sleeves is arranged between a corresponding one of the first pipes and one of the second pipes;

[0013] At least part of the first pipe, the second pipe and the sleeve cooperate to form a serpentine space flow channel, and the cooling medium in adjacent first pipes, adjacent second pipes and adjacent rows of sleeves in the serpentine space flow channel flows in opposite directions.

[0014] Optionally, the serpentine spatial flow channel includes multiple groups of adjacent first pipe groups and multiple groups of adjacent second pipe groups, the first pipe group includes two adjacent first pipes, and the second pipe group includes two adjacent second pipes; one end of the first pipe group is connected and the other end is not connected, one end of the second pipe group is not connected and the other end is connected; one first pipe group and one second pipe group are staggered and only connected to one row of the sleeves.

[0015] Optionally, one end of the first pipeline group facing the first direction is connected, and the other end facing the opposite second direction is not connected; one end of the second pipeline group facing the second direction is connected, and the other end facing the first direction is not connected.

[0016] Optionally, one first pipe is provided on both sides of multiple groups of the second pipe groups, or one second pipe is provided on both sides of multiple groups of the first pipe groups; the two first pipes or the two second pipes located on both sides are respectively provided with a cooling medium inlet and a cooling medium outlet.

[0017] Optionally, multiple first pipes are arranged in a serpentine shape, multiple second pipes are not directly connected, and the first pipe is divided into at least two sections that are not connected to each other by at least one partition; or, multiple second pipes are arranged in a serpentine shape, multiple first pipes are not directly connected, and the second pipe is divided into at least two sections that are not connected to each other by at least one partition.

[0018] Optionally, the condensing pipe section of the heat pipe is sequentially inserted into the first pipe and the sleeve, and passes through the second pipe, and the sealing portion is provided at the end portion passing through the second pipe.

[0019] Optionally, the condensing pipe section of the heat pipe is inserted into the first pipe and the sleeve in sequence; the flue gas heat exchanger also includes a plurality of sealing strips extending along the length direction of the first pipe, the sealing strips are arranged between adjacent first pipes, and the two sides of the sealing strips are respectively sealed with the side walls of two adjacent first pipes.

[0020] Optionally, it further includes a cooling section shell, wherein the first pipe, the second pipe, and the sleeve are all placed in the cooling section shell, and a top cover is provided on the top of the cooling section shell.

[0021] Optionally, the condensing pipe section of the heat pipe is inserted into the first pipe and the sleeve in sequence; the flue gas heat exchanger also includes two fixing plates, the sides of the fixing plates have multiple snap positions, and the ends of multiple first pipes are partially embedded in the snap positions one by one.

[0022] Optionally, the flue gas heat exchanger includes a plurality of the heat pipes arranged in a criss-cross pattern, and a vertical row of the heat pipes corresponds to one first pipe and one second pipe; and further includes a clamping portion, and a horizontal row of the heat pipes is clamped and fixed by the clamping portion.

[0023] Optionally, the heat pipe includes an evaporation tube section for exchanging heat with the flue gas; the flue gas heat exchanger also includes a support member, the support member includes a support bottom plate and a support side column, and the ends of the evaporation tube section are inserted into the support bottom plate; the ends of the clamping portion and the ends of the fixing plate are fixed to the support side columns.

[0024] In the present invention, each single heat pipe is equipped with a sealing part with a built-in leakage monitoring function. For multiple heat pipes of the flue gas heat exchanger, online observation of working fluid leakage or vacuum drop in the pipe can be performed separately, and one or more leaking heat pipes can be replaced or the heat pipe with reduced vacuum can be re-evacuated based on the observation results. There is no need to check all the heat pipes. While improving the heat exchange effect of the flue gas heat exchanger and effectively extending the service life of the flue gas heat exchanger, the maintenance efficiency can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a specific embodiment of the flue gas heat exchanger provided by the present invention;

[0026] Figure 2 for Figure 1 Left view of;

[0027] Figure 3 for Figure 1 Schematic diagram of the heat pipe;

[0028] Figure 4 for Figure 1 A schematic diagram of the structure of the connection between the middle sealing part and the end of the heat pipe;

[0029] Figure 5 for Figure 4 Schematic diagram of the middle diaphragm after deformation;

[0030] Figure 6 for Figure 1 A three-dimensional schematic diagram of the flow of the cooling medium in the first pipe, the second pipe and the sleeve;

[0031] Figure 7 It is a top view of the condensing section of the flue gas heat exchanger;

[0032] Figure 8 for Figure 1 A schematic diagram of the arrangement of the first pipeline, the second pipeline, the sleeve, and the heat pipe, showing the flow path of the cooling medium;

[0033] Fig. 9 is a schematic diagram of the arrangement of the first pipeline, the second pipeline, the sleeve, and the heat pipe in another embodiment, showing the flow path of the cooling medium;

[0034] Fig.10 for Figure 1 Schematic diagram of the middle sealing strip.

[0035] Figure 1-10 The reference numerals in the drawings are described as follows:

[0036] 101- condensing section shell; 102- flange cover; 103- flange; 104- bolt;

[0037] 201-first pipeline; 202-second pipeline; 202a-partition plate; 203-casing; 204-cooling medium inlet; 205-cooling medium outlet; 206-sealing strip; 206a-arc-shaped side wall; 207-connecting pipe;

[0038] 30-fixed plate;

[0039] 401-supporting side column; 402-supporting bottom plate;

[0040] 50-heat pipe; 501-pin; 50a-evaporation pipe section; 50b-insulation pipe section; 50c-condensation pipe section;

[0041] 60-sealing part; 601-first shell; 601a-connecting edge; 602-second shell; 602a-extending edge; 603a-bolt; 603b-nut; 604-capillary tube; 605-sealing joint; 606-threaded joint; 606a-flow hole; 60a-flowing medium;

[0042] 70-Pair of clamping plates. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Please refer to Figure 1-3 , Figure 1 A schematic structural diagram of a specific embodiment of the flue gas heat exchanger provided by the present invention; Figure 2 for Figure 1 Left view of; Figure 3 for Figure 1 Schematic diagram of the heat pipe.

[0045] The flue gas heat exchanger in this embodiment can be placed in the flue to exchange heat with the flue gas. The flue gas heat exchanger includes a plurality of heat pipes 50 and sleeves 203 corresponding to the plurality of heat pipes 50. The tube cavity of the heat pipe 50 is evacuated to a vacuum state, and a liquid heat exchange medium is filled therein, which can be water. A cooling medium, which can also be water, flows in the sleeve 203. Figure 1 As shown, the upper pipe section of the heat pipe 50 is inserted into the sleeve 203, and the flue gas enters the lower part of the multiple heat pipes 50 from left to right. The high-temperature flue gas exchanges heat with the heat exchange medium in the heat pipe 50. The heat exchange medium absorbs heat and evaporates to form steam, and flows upward to enter the upper pipe section that matches the sleeve 203. After exchanging heat with the cooling medium, the heat exchange medium in the heat pipe 50 condenses to form liquid and flows back to the lower pipe section, so that it can continue to exchange heat with the flue gas.

[0046] like Figure 3 As shown, based on the functions of different pipe sections of the heat pipe 50, the lower pipe section of the heat pipe 50 for heat exchange with the flue gas can be defined as an evaporation pipe section 50a, the upper pipe section of the heat pipe 50 cooperating with the sleeve 203 can be defined as a condensation pipe section 50c, and the critical area between the evaporation pipe section 50a and the condensation pipe section 50c is defined as an insulation pipe section 50b. Figure 3 The lengths of each section are L1, L2, and L3, and the lengths can be set according to actual working conditions. Figure 1-3As shown, a plurality of protruding pins 501 are provided around the evaporation pipe section 50a. The plurality of pins 501 can be evenly distributed around the evaporation pipe section 50a. The pins 501 can reduce or even avoid dust deposition while strengthening the flue gas disturbance and enhancing the heat exchange effect.

[0047] The heat pipe 50 is used as the heat exchange element of the flue gas heat exchanger. Compared with the heat exchange tube of the conventional flue gas heat exchanger, the wall temperature can be increased by 20-30 degrees, which effectively prevents the low-temperature corrosion of the flue gas heat exchanger caused by flue gas condensation. In addition, the heat pipe 50 is filled with a heat exchange medium that can change phase. The heat exchange medium has a limited stock and is not easy to leak with the external cooling medium, which is beneficial to the safety of upstream and downstream equipment.

[0048] After understanding how the flue gas heat exchanger works, please continue to combine Figure 1 , and refer to Figure 4 , 5 , Figure 4 for Figure 1 A schematic diagram of the structure of the connection between the middle sealing part 60 and the end of the heat pipe 50; Figure 5 for Figure 4 Schematic diagram of the middle diaphragm after deformation.

[0049] In this embodiment, both ends of the heat pipe 50 are sealed. Figure 1 The upper end of each heat pipe 50 is provided with a sealing portion 60 to seal the upper end of the tube cavity of the heat pipe 50. Figure 4 As shown, the sealing part 60 has a chamber, which is specifically formed by the first shell 601 and the second shell 602 being buckled together. A diaphragm 607 is provided in the chamber, and the diaphragm 607 can separate the chamber into a first chamber and a second chamber. The first chamber is connected to the tube cavity of the heat pipe 50, and the second chamber can be filled with a flowing medium 60a. The second chamber is also connected to a display tube, which can be specifically Figure 4 The capillary 604 shown in FIG. 6 is connected to the outside of the second shell 602, that is, Figure 4 As shown, the upper outer side of the second shell 602 is closer to the end of the heat pipe 50 than the second shell 602, and the display tube passes through the second shell 602, and its tube cavity is connected to the inner side of the second shell 602, that is, connected to the second chamber. The display tube can be fixed to the second shell 602 by bonding or welding, or can be integrally formed with the second shell 602.

[0050] Since the first chamber is connected to the tube cavity of the heat pipe 50, when the heat pipe 50 leaks or the vacuum degree decreases, the pressure in the heat pipe 50 increases, and the pressure in the first chamber also increases accordingly, and the diaphragm 607 will elastically deform toward the second chamber on the opposite side, such as Figure 5 As shown, the diaphragm 607 will be pushed upward, and the volume of the second chamber will become smaller, forcing the flowing medium 60a to flow toward the display tube, and the liquid level of the flowing medium 60a in the display tube will rise. Figure 5 Compared to Figure 4 , the liquid level of the display tube rises significantly. By observing the change in the liquid level of the flowing medium 60a in the display tube, it can be known whether the corresponding heat pipe 50 has leakage or reduced vacuum. The display tube uses a capillary tube 604, which can provide more accurate feedback on the deformation of the diaphragm 607 and more timely grasp of the leakage. Of course, the tube diameter of the display tube can be slightly larger, but the accuracy is inferior to that of the capillary tube 604.

[0051] It can be seen that in the solution provided in this embodiment, each single heat pipe 50 is installed with a sealing portion 60 with a built-in leakage monitoring function. For multiple heat pipes 50 of the flue gas heat exchanger, online observation of the leakage of the working medium in the pipe or the decrease in the vacuum degree in the pipe can be performed separately, and based on the observation results, one or more leaking heat pipes 50 can be replaced or the heat pipe 50 with a decreased vacuum degree can be re-evacuated in a targeted manner, without the need to check all the heat pipes. On the premise of improving the heat exchange effect of the flue gas heat exchanger and effectively extending the service life of the flue gas heat exchanger, the maintenance efficiency can also be improved.

[0052] The sealing part 60 mentioned above includes a first shell 601 and a second shell 602 that are interlocked to form a chamber. On the one hand, it is easy to form the chamber, and on the other hand, it is also convenient to fasten the diaphragm 607 between the first shell 601 and the second shell 602 to achieve the separation of the chamber. Figure 4 As shown, the edges of the first shell 601 and the second shell 602 can be extended to form connecting edges 601a and 602a respectively. When the two are buckled, the connecting edges 601a and 602a fit together and are fixed by bolts 603a and nuts 603b. The edges of the diaphragm 607 can be pressed between the fitting connecting edges 601a and 602a. It can be understood that the formation of the chamber and the fixing of the diaphragm 607 are not limited to this method. For example, the chamber is formed by an integrated shell, and the diaphragm 607 can be sealed and fixed in the shell by bonding, crimping, etc.

[0053] Please continue to refer to Figure 4In addition to the shell that forms the above-mentioned chamber, the sealing part 60 also includes a sealing joint 605, which seals the end of the heat pipe 50. The sealing joint 605 can be connected to the end of the heat pipe 50 by welding, crimping or other connection methods. In this embodiment, a threaded hole is provided in the middle of the sealing joint 605, and a threaded joint 606 matching the threaded hole is provided on the outside of the first shell 601. The threaded joint 606 forms a through-flow hole 606a, and one end of the flow hole 606a is connected to the inside of the first shell 601, that is, connected to the first chamber. During assembly, the threaded joint 606 can be screwed into the threaded hole of the sealing joint 605, and the other end of the flow hole 606a can be connected to the tube cavity of the heat pipe 50. In this way, the first chamber is connected to the tube cavity of the heat pipe 50 through the flow hole 606a, which is simple and easy.

[0054] The threaded joint 606 can be integrally formed on the outside of the first shell 601, which is conducive to ensuring the sealing performance of the sealing part 60. Of course, the threaded joint 606 can also be fixed on the outside of the first shell 601 by welding, sealing crimping, etc. In fact, the sealing joint 605 and the first shell 601 can also be an integral structure. The sealing joint 605 can directly set a flow hole 606a connecting the first chamber and the tube cavity of the heat pipe 50, without the need to set the threaded joint 606, threaded holes and other components. Of course, the sealing joint 605 and the threaded joint 606 are separated to facilitate the connection between the sealing joint 605 and the heat pipe 50.

[0055] In the above embodiment, the heat pipe 50 is provided with an end portion of the sealing portion, which is the end portion close to the condensing pipe section 50c. Figure 1 As shown, the condensing tube section 50c and the sleeve 203 are both located at the top, and the sealing portion 60 is arranged at one end of the condensing tube section 50c for easy observation, which is also beneficial to the arrangement of the display tube. Of course, on the premise of being able to display the change of liquid level, the heat pipe 50 can also be arranged at the other end, but at this time the bottom of the display tube should not be lower than the second chamber to ensure that the liquid level can change.

[0056] Please continue to refer to Figure 1 , 2 For the convenience of description, the condensing structural part in the flue gas heat exchanger is defined as the condensing section in this paper. The flue gas heat exchanger accordingly includes a condensing section shell 101. The sleeve 203 and the condensing pipe section 50c of the heat pipe 50 are both part of the condensing section and are both located in the condensing section shell 101. The condensing section shell 101 includes four side walls and a top cover on the top. Specifically, a flange 103 can be provided on the top surface of the side wall of the condensing section shell 101. The top cover is a flange cover 102. The flange cover 102 and the flange 103 are fastened to cover the top of the condensing section shell 101. The flange cover 102 and the flange 103 can be fixed by bolts 104 and nuts. Of course, the structure of the top cover is not limited to this.

[0057] Specifically, the condensing section of the flue gas heat exchanger also includes a plurality of first pipes 201 arranged side by side and a plurality of second pipes 202 arranged side by side. A row of sleeves 203 is provided between a first pipe 201 and a corresponding second pipe 202. The row of sleeves 203 is interconnected with the corresponding first pipe 201 and the second pipe 202. A row of sleeves 203 corresponds to a row of heat pipes 50. At this time, the end of the heat pipe 50 can pass through the second pipe 202, and the above-mentioned sealing portion 60 is provided on the protruding portion. It can be understood that when the sealing portion 60 is provided at the other end, the heat pipe 50 does not need to pass through the second pipe, but can be inserted into the sleeve 203.

[0058] Please continue to refer to Figure 6 , 7 , 8, Figure 6 for Figure 1 A three-dimensional schematic diagram of the flow of the cooling medium in the first pipe 201, the second pipe 202, and the sleeve 203; Figure 7 It is a top view of the condensing section of the flue gas heat exchanger, and shows the first pipeline 201 in half section, so as to more intuitively understand the flow path of the cooling medium; Figure 8 for Figure 1 Schematic diagram of the arrangement of the first pipeline, the second pipeline, the sleeve, and the heat pipe, showing the flow path of the cooling medium.

[0059] In this embodiment, Figure 6 As shown, the first pipe 201, the second pipe 202, and the sleeve 203 cooperate to form a serpentine space flow channel. Specifically, the pipes of the serpentine space flow channel can be grouped, including multiple groups of adjacent first pipe groups A and multiple groups of adjacent second pipe groups B. The first pipe group A includes two adjacent first pipes 201, and the second pipe group B includes two adjacent second pipes 202. Figure 7 As shown, four groups of first pipeline groups A and three groups of second pipeline groups B are shown. Due to the half-section, only approximately half of the pipeline group is shown.

[0060] In addition, one end of the first pipeline group A facing the first direction is connected, and the other end facing the second direction is not connected. The first direction and the second direction are opposite, which is shown in Figure 7 The upper end is connected and the lower end is not connected (combined with Figure 6 ); one end of the second pipe group B facing the first direction is not connected, and the other end facing the second direction is connected, which is shown in Figure 7 In the middle, that is, the upper end is not connected (combined Figure 6 ), the lower ends are connected, that is, the connected and non-connected settings of the ends of the first pipeline group A and the second pipeline group B are opposite. The connection between adjacent first pipelines 201 and adjacent second pipelines 202 can be achieved through a connecting pipe 207. Of course, the first pipeline group A and the second pipeline group B can also be formed in one piece, that is, a pipe body is bent into a U shape to form two first pipelines 201 or second pipelines 202 respectively.

[0061] In addition, the first pipeline group A and the second pipeline group B are also staggered along the arrangement direction of the pipelines, and only connect one row of sleeves 203 together. In this way, a first pipeline 201 of the first pipeline group A and a second pipeline 202 of the second pipeline group B are connected to a row of sleeves 203 together, and another first pipeline 201 and a second pipeline 202 of another second pipeline group B are connected to a row of sleeves 203 together, completing the serpentine arrangement in sequence.

[0062] Specific reference for staggered arrangement Figure 7 It is understood that the second pipeline 201 on the left side of the leftmost second pipeline group B corresponds to the first pipeline 201 on the right side of the leftmost first pipeline group A, and the second pipeline 201 on the right side of the leftmost second pipeline group B corresponds to the first pipeline 201 on the left side of the first pipeline group A second from the left.

[0063] Please continue to refer to Figure 6 , 7 A second pipe 202 is provided on both sides of the multiple second pipe groups B, that is, two second pipes 202 are provided on both sides of the condensing section of the flue gas heat exchanger, one second pipe 202 is provided with a cooling medium inlet 204, and the other second pipe 202 is provided with a cooling medium outlet 205.

[0064] like Figure 6 As shown, the cooling medium enters from the second pipe 202 as the input pipe on one side through the cooling medium inlet 204, flows downward to the corresponding row of sleeves 203, and then enters a first pipe 201 of the first group of first pipe groups A, flows through the first pipe 201 to another first pipe 201 in the first pipe group A, and then flows upward into the sleeve 203, flows into a second pipe 202 of the first group of second pipe groups B through the sleeve 203, and then flows into another second pipe 202 of the second pipe group B, and then repeats the above cycle until it flows to the second pipe 202 as the output pipe on the other side and flows out from the cooling medium outlet 205.

[0065] In this way, a serpentine space flow channel is formed, and the flow direction of the cooling medium in the two adjacent rows of sleeves 203 is opposite, the flow direction in the adjacent first pipes 201 is opposite, and the flow direction in the adjacent second pipes 202 is also opposite, so the heat exchange is sufficient and the heat exchange efficiency is improved.

[0066] In the above scheme, the connection and non-connection settings of the ends of the first pipe group A and the second pipe group B are opposite, which can be understood or the same. Of course, in comparison, the opposite connection settings of the ends are conducive to the cooling medium flowing more evenly and fully along the required path. Figure 7For example, the second pipeline group B on the far right can also be connected at the upper end. In this case, when the cooling medium of the first pipeline 201 located below it flows through the sleeve 203 to the corresponding second pipeline 202, the flow path of the adjacent sleeve 203 and the adjacent second pipeline 201 is also opposite, but Figure 7 The configuration can further facilitate the cooling medium to fill the corresponding second pipe 202 and sleeve 203.

[0067] Understandably, Figure 6 , 7 It is a specific way of setting the serpentine space flow channel, but it is not limited to this. It can be set as long as part of it is set as the above-mentioned serpentine space flow channel. For example, a second pipe 202 can be set in the middle of the condensation section as the input pipe of the cooling medium, and then the two sides of the second pipe 202 are arranged according to the above-mentioned serpentine space flow channel. Then the cooling medium flows to both sides through the input pipe, and flows according to the above-mentioned serpentine space flow method, and then flows out from both sides of the condensation section. In addition, in this embodiment, the cooling medium inlet 204 and the cooling medium outlet 205 are arranged in the second pipe 202 at the upper part of the condensation section. It can be seen that the cooling medium inlet and outlet can also be arranged in the first pipe 201 at the lower part of the condensation section, and the flow direction is just opposite.

[0068] It should be noted that in this embodiment, multiple first pipes 201 and second pipes 202 are provided to cooperate with the sleeve 203 to form a serpentine space flow channel, but it is not limited to this. Upper and lower connecting boxes can be provided, and multiple rows of sleeves 203 are connected to the upper connecting box and the lower connecting box, which is also a feasible solution. Of course, the arrangement of the serpentine space flow channel improves the thermal efficiency of the pipe, which is a preferred technical solution. In addition, since multiple first pipes 201 are provided separately, the first pipes 201 can be set as circular pipes, thereby meeting the use condition requirements of medium and high pressure resistance (generally greater than or equal to 1.6Mpa).

[0069] Please continue to refer to Fig. 9 , Fig. 9 It is a schematic diagram of the arrangement of the first pipe 201, the second pipe 202, the sleeve 203, and the heat pipe 50 in another embodiment, showing the flow path of the cooling medium.

[0070] Fig. 9 In the embodiment, the plurality of second pipes 202 are arranged in a serpentine shape, and a partition 202a is provided in the middle of the second pipe 202, and the partition 202a divides the second pipe 202 into two sections that are not connected to each other. In addition, the plurality of first pipes 201 are not directly connected, and the two sections of the first pipe 201 are closed. Fig. 9In the flow path shown, the second pipes 202 located on both sides are respectively connected to the cooling medium inlet 204 and the cooling medium outlet 205. The cooling medium enters from the cooling medium inlet 204, flows into the second pipe 202, flows in a section of the second pipe 202 separated by the partition 202a, and flows downward into the first pipe 201. When flowing into the rear section of the first pipe 201, it can only flow upward and enter another section of the second pipe 202 separated by the partition 202a, and then flows into the second pipe 202 adjacent thereto, and repeats a similar circulation flow path.

[0071] It can be seen that in this embodiment, the flow directions of the cooling medium in the adjacent first pipes 201 and the adjacent second pipes 202 are opposite, and the flow directions of the cooling medium in the two adjacent rows of sleeves 203 are also opposite. Figure 7 Taking the two rows of casing 203 on the left side as an example, a row of casing 203 is divided into a front half row and a back half row in the direction of the arrow. The front half row of the first row of casing 203 on the left side flows downward, and the back half row flows upward. The back half row of the second row of casing 203 on the left side flows downward, and the front half row flows upward. That is, not only the flow directions of the two adjacent rows of casing 203 are opposite, but the flow directions of different intervals in a row of casing 203 are also opposite, so the heat exchange effect is better.

[0072] It is understood that it is not limited to setting one partition 202a, but it can also be multiple, so that the cooling medium will flow in a serpentine manner multiple times in a row of sleeves 203. In addition, multiple first pipes 201 are arranged in a serpentine manner, the first pipes 201 are separated by partitions, and the second pipes 202 are not directly connected to each other. In addition, the cooling medium inlet 204 and the cooling medium outlet 205 can be set in the first pipe 201 on both sides or the second pipe 202 on both sides.

[0073] Please continue to refer to Fig.10 , and combined with Figure 1 understand, Fig.10 for Figure 1 Schematic diagram of the middle sealing strip 206.

[0074] like Figure 1 As shown, the flue gas heat exchanger further includes a plurality of sealing strips 206 extending along the length direction of the first pipe 201. The length of the sealing strips 206 is substantially equal to the length of the first pipe 201. The sealing strips 206 are arranged between adjacent first pipes 201. The two sides of the sealing strips 206 are respectively sealed with the side walls of the two adjacent first pipes 201, so that the flue gas can be blocked from entering the condensation section of the flue gas heat exchanger. Fig.10As shown, the two sides of the sealing strip 206 are in an inwardly concave arc shape, forming an inwardly concave arc-shaped side wall 206a. If the first pipe 201 is in a circular tube shape, the side wall of the first pipe 201 can be inserted into the corresponding inwardly concave arc-shaped side wall 206a of the sealing strip 206. On the one hand, the connection is more reliable, and on the other hand, the sealing effect is better. Of course, when the cross-section of the heat pipe 50 is non-circular, the clamping shape of the sealing strip 206 can also be adaptively adjusted. The sealing strip 206 is used to isolate the flue gas from entering the condensation section, which saves materials and is simple to install, thereby reducing manufacturing costs. In addition, the plurality of first pipes 201 are sealed with the flue gas at the bottom through the sealing strip 206, so the first pipe 206 is easy to disassemble, which improves the convenience of maintenance and replacement.

[0075] Please continue to refer to Figure 1 , 2 The flue gas heat exchanger further comprises two fixing plates 30, the sides of the fixing plates 30 have a plurality of snap-in positions, and the portions of the peripheral walls of the ends of the plurality of first pipes 201 are correspondingly embedded in the snap-in positions. Figure 1 As shown, the upper side of the fixing plate 30 can be provided with a plurality of arc-shaped clamping positions, and the lower part of the end of the cylindrical first pipe 201 can be embedded in the arc-shaped clamping position, and the clamping position can be semi-arc-shaped, and the lower half of the end of the first pipe 201 is clamped into the clamping position, so as to achieve the purpose of fixing a plurality of first pipes 201 and forming a module. This structure is simple, the processing cost is low, and it is also easy to install.

[0076] like Figure 1 , 2 As shown, the flue gas heat exchanger includes multiple rows of heat pipes 50 arranged in a crisscross pattern, and a vertical row of heat pipes 50 corresponds to a first pipe 201 and a second pipe 202; it also includes a clamping portion, and a horizontal row of heat pipes 50 is clamped and fixed by a clamping portion. The clamping portion may specifically include two clamped tube plates 70, and the two clamped tube plates 70 are respectively located on both sides of a horizontal row of heat pipes 50, clamping a horizontal row of heat pipes 50, and can be clamped in the middle of the horizontal row of heat pipes 50, and one or more clamping portions may be provided. After the two clamped tube plates 70 are clamped with a horizontal row of heat pipes 50, the two clamped tube plates 70 can be welded and fixed, and of course, they can also be fixed by fasteners. Similarly, the side of the clamped tube plates 70 facing the heat pipe 50 can be an arc-shaped clamping position to facilitate the clamping of the circular tubular heat pipe 50. The vertical row of heat pipes 50 has been inserted into the corresponding first pipes 201 and second pipes 202, and the horizontal row is fixed by the clamping part, so that the multiple rows of heat pipes 50 are positioned in two vertical directions, thereby forming a module with a more stable structure.

[0077] like Figure 1As shown, the flue gas heat exchanger further includes a support member, which includes a support bottom plate 402 and a plurality of support side columns 401. The top of the support member is an annular support frame. The evaporation pipe section 50a of the heat pipe 50 is located in a space surrounded by a plurality of support side columns 401, and the ends of the evaporation pipe section 50a are inserted into the support bottom plate 402. The support bottom plate 402 may be provided with a limiting hole, into which the heat pipe 50 is inserted. The aperture of the limiting hole is set to meet the requirement of limiting without affecting the thermal expansion and contraction of the heat pipe 50.

[0078] In addition, when the support member is provided with a support side column 401, the end of the clamping portion and the end of the fixing plate 30 can be fixed to the support side column 401, thereby completing the fixation of the entire device. The support member is provided with a support side column 401, which not only plays the role of supporting the entire device, but also reserves more space for the flue gas to enter between the evaporation pipe sections 50a of the heat pipe 50 below the flue gas heat exchanger, so as to facilitate heat exchange. It can be understood that the support member is not limited to this structure, for example, it can also be a shell provided with a flue gas inlet, or it can be set as a mesh frame, etc.

[0079] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Flue gas heat exchanger, characterized in that: Comprising a plurality of heat pipes (50); a sealing portion (60) for sealing a tube cavity of the heat pipe (50) is provided at an end of the heat pipe (50); the sealing portion (60) has a chamber; a diaphragm (607) is provided in the chamber; the diaphragm (607) separates the chamber into a first chamber and a second chamber; the first chamber is in communication with the tube cavity of the heat pipe (50); The second chamber can be filled with a flowing medium, the second chamber is also connected to a display tube, and when the diaphragm (607) is deformed toward one side of the second chamber, the liquid level of the flowing medium in the display tube changes; The heat pipe (50) comprises an evaporation pipe section (50a) for exchanging heat with flue gas, and the heat pipe (50) comprises a condensation pipe section (50c) for exchanging heat with a cooling medium, and the end of the heat pipe (50) where the sealing portion (60) is provided is close to the condensation pipe section (50c); The flue gas heat exchanger further comprises a plurality of sleeves (203) corresponding one-to-one to the heat pipes (50) and allowing cooling medium to flow; one sleeve (203) is correspondingly inserted into the condensing pipe section (50c) of each heat pipe (50).

2. The flue gas heat exchanger according to claim 1, characterized in that: The sealing portion (60) comprises a first shell (601) and a second shell (602) which are engaged with each other to form the chamber, the diaphragm (607) is fastened between the first shell (601) and the second shell (602), and the display tube is connected to the outside of the second shell (602) and communicated with the inside of the second shell (602) to communicate with the second chamber.

3. The flue gas heat exchanger according to claim 2, characterized in that: The sealing portion (60) comprises a sealing joint (605), the sealing joint (605) sealingly connecting the end of the heat pipe (50), and a threaded hole is provided in the middle of the sealing joint (605); a threaded joint (606) matching the threaded hole is provided on the outer side of the first shell (601), and a through flow hole (606a) is formed in the threaded joint (606), and one end of the flow hole (606a) is connected to the inner side of the first shell (601) to connect to the first chamber; after the threaded joint (606) is inserted into the sealing joint (605), the other end of the flow hole (606a) is connected to the tube cavity of the heat pipe (50).

4. The flue gas heat exchanger according to any one of claims 1 to 3, characterized in that: The display tube is a capillary tube (604).

5. The flue gas heat exchanger according to any one of claims 1 to 3, characterized in that: A plurality of protruding pins (501) are provided around the evaporation tube section (50a).

6. The flue gas heat exchanger according to claim 1, characterized in that: The flue gas heat exchanger comprises a plurality of first pipes (201) arranged side by side and a plurality of second pipes (202) arranged side by side, and a row of the sleeves (203) is arranged between a corresponding one of the first pipes (201) and one of the second pipes (202); At least part of the first pipe (201), the second pipe (202), and the sleeve (203) cooperate to form a serpentine space flow channel, and the cooling medium in adjacent first pipes (201), adjacent second pipes (202), and two adjacent rows of the sleeves (203) in the serpentine space flow channel flows in opposite directions.

7. The flue gas heat exchanger according to claim 6, characterized in that: The serpentine spatial flow channel comprises a plurality of adjacent first pipeline groups (A) and a plurality of adjacent second pipeline groups (B), wherein the first pipeline group (A) comprises two adjacent first pipelines (201), and the second pipeline group (B) comprises two adjacent second pipelines (202); one end of the first pipeline group (A) is connected and the other end is not connected, and one end of the second pipeline group (B) is not connected and the other end is connected; one first pipeline group (A) and one second pipeline group (B) are staggered and only connected to one row of the sleeves (203).

8. The flue gas heat exchanger according to claim 7, characterized in that: The first pipe group (A) is connected at one end facing the first direction, and is disconnected at the other end facing the opposite second direction; the second pipe group (B) is connected at one end facing the second direction, and is disconnected at the other end facing the first direction.

9. The flue gas heat exchanger according to claim 7, characterized in that: A first pipeline (201) is respectively provided on both sides of the plurality of second pipeline groups (B), or a second pipeline (202) is respectively provided on both sides of the plurality of first pipeline groups (A); the two first pipelines (201) or the two second pipelines (202) located on both sides are respectively provided with a cooling medium inlet (204) and a cooling medium outlet (205).

10. The flue gas heat exchanger according to claim 6, characterized in that: A plurality of the first pipes (201) are arranged in a serpentine shape, a plurality of the second pipes (202) are not directly connected, and the first pipe (201) is divided into at least two sections that are not connected to each other by at least one partition; or a plurality of the second pipes (202) are arranged in a serpentine shape, a plurality of the first pipes (201) are not directly connected, and the second pipe (202) is divided into at least two sections that are not connected to each other by at least one partition.

11. The flue gas heat exchanger according to any one of claims 6 to 10, characterized in that: The condensing pipe section (50c) of the heat pipe (50) is sequentially inserted into the first pipe (201) and the sleeve (203), and passes through the second pipe (202); the sealing portion (60) is provided at the end portion passing through the second pipe (202).

12. The flue gas heat exchanger according to any one of claims 6 to 10, characterized in that: The condensing pipe section (50c) of the heat pipe (50) is inserted into the first pipe (201) and the sleeve (203) in sequence; the flue gas heat exchanger further comprises a plurality of sealing strips (206) extending along the length direction of the first pipe (201), the sealing strips (206) being arranged between adjacent first pipes (201), and the two sides of the sealing strips (206) are respectively sealed to the side walls of two adjacent first pipes (201).

13. The flue gas heat exchanger according to any one of claims 6 to 10, characterized in that: The condensing pipe section (50c) of the heat pipe (50) is inserted into the first pipe (201) and the sleeve (203) in sequence; the flue gas heat exchanger further comprises two fixing plates (30), the sides of the fixing plates (30) having a plurality of snap-in positions, and the ends of the plurality of first pipes (201) are partially embedded in the snap-in positions in a one-to-one correspondence.

14. The flue gas heat exchanger according to claim 13, characterized in that: The flue gas heat exchanger comprises a plurality of heat pipes (50) arranged in a crisscross pattern, wherein a vertical row of the heat pipes (50) corresponds to one first pipe (201) and one second pipe (202); and further comprises a clamping portion, wherein a horizontal row of the heat pipes (50) is clamped and fixed by the clamping portion.

15. The flue gas heat exchanger according to claim 14, characterized in that: The heat pipe (50) comprises an evaporation pipe section (50a) for exchanging heat with flue gas; the flue gas heat exchanger further comprises a support member, the support member comprising a support bottom plate (402) and a support side column (401), the ends of the evaporation pipe section (50a) are both inserted into the support bottom plate (402); the ends of the clamping portion and the ends of the fixing plate (30) are both fixed to the support side columns (401).

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