A tile kiln waste heat recovery countercurrent heat exchange pipeline device

Abstract

The application discloses a tile kiln waste heat recovery countercurrent heat exchange pipeline device and belongs to the heat exchange pipeline field. The tile kiln waste heat recovery countercurrent heat exchange pipeline device comprises a heat exchange base frame, the heat exchange base frame comprises a hot air pipe, a waste heat pipe and heat exchange pipe fittings, baffles are arranged in the waste heat pipe, a plurality of heat exchange pipe fittings are staggered, heat exchange gaps are formed between the baffles and the heat exchange pipe fittings, first flow guide arms and second flow guide arms for guiding waste heat gas are arranged on the baffles, and gas in the heat exchange gaps flows. According to the application, the baffles with heat exchange gaps are arranged on the windward surfaces of the heat exchange pipe fittings, the Venturi suction effect generated by the eight-shaped first flow guide arms and the second flow guide arms is utilized, the first-stage self-circulation small vortexes close to the pipe wall are formed in the heat exchange gaps, the windward surface ash is continuously stripped by the vortex boundary layer shear force, the direct impact of large-particle dust is blocked, and sufficient convection heat exchange of the windward surface is ensured.

Description

Technical Field

[0001] This invention relates to the field of heat exchange pipeline technology, and in particular to a counter-current heat exchange pipeline device for waste heat recovery in tile kilns. Background Technology

[0002] During the firing process, tile kilns generate a large amount of high-temperature waste gas, and the heat it carries accounts for a large proportion of the total energy consumption of the kiln. Recovering this waste heat for use in processes such as drying of the tile blanks and heating of the workshop is a key measure to reduce the production cost of tiles and achieve energy conservation and emission reduction. Currently, waste heat recovery in kilns mainly uses equipment such as shell-and-tube heat exchangers, finned heat exchangers, and counter-flow heat exchangers. However, in high-dust application scenarios such as tile kilns, in existing counter-flow heat exchangers, a large number of dust particles in the waste heat gas will adhere to the surface of the heat exchange tubes, especially the impact deposition zone on the windward side of the heat exchange tubes and the low-speed stagnation zone on the leeward side. After running for a period of time, the heat exchange efficiency will be greatly reduced, and in severe cases, it may even lead to pipe blockage, forcing the kiln to shut down. To prevent dust from directly adhering to the windward side of the heat exchange tubes, some existing technologies install baffles on the windward side of the heat exchange tubes to divert the dust in front of the heat exchange tubes. However, this solution also completely blocks the windward side of the heat exchange tubes, preventing waste heat gas from directly convecting and exchanging heat with the windward side of the heat exchange tubes. Instead, heat can only be transferred through thermal radiation. Furthermore, the contact area of ​​the waste heat gas across the leeward side of the heat exchange tubes is limited, resulting in a significant decrease in overall heat exchange efficiency and an inability to fully recover the waste heat from the kiln. Summary of the Invention

[0003] The purpose of this invention is to solve the problems mentioned in the background art and to propose a counter-current heat exchange pipeline device for waste heat recovery in tile kilns.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A counter-current heat exchange pipeline device for waste heat recovery in a tile kiln includes a heat exchange base frame, which includes a hot air pipe, a waste heat pipe, and multiple heat exchange pipe fittings for penetrating the hot air pipe and the waste heat pipe. A baffle is installed inside the waste heat pipe, and the multiple heat exchange pipe fittings are arranged alternately. The baffle is located on the windward side of the heat exchange pipe fitting and forms a heat exchange gap with the heat exchange pipe fitting. A first guide arm and a second guide arm are arranged in a figure-eight shape on the baffle. The first and second guide arms are used to guide the waste heat gas, allowing the gas to flow within the heat exchange gap.

[0005] Preferably, the width of the heat exchange gap is one-eighth to one-sixth of the diameter of the heat exchange tube.

[0006] Preferably, the tails of the first guide arm and the second guide arm are arranged in an outward arc shape, and the adjacent first guide arms and second guide arms have the same arc and form a nozzle gap.

[0007] Preferably, the width of the nozzle gap is one-twelfth to one-tenth of the diameter of the heat exchange tube.

[0008] To facilitate airflow guidance, preferably, the baffle is provided with an air inlet and a guide plate is provided at the air inlet. Guide grooves are provided in both the first guide arm and the second guide arm, and the two ends of the guide plate are respectively oriented towards the two guide grooves.

[0009] Preferably, the portion of the guide groove located on the first guide arm and the second guide arm gradually decreases in size along the airflow direction and tilts downward, and a solid plate is provided on the upper part of the guide groove on both the first and second guide arms.

[0010] To facilitate the collection of small particulate impurities, preferably, the bottom of the heat exchange base is provided with a collection port and a collection trough. The collection port is located on the leeward side of the heat exchange tube, and multiple collection ports are connected to the collection trough.

[0011] To prevent small particulate impurities from being thrown up, the collecting trough is preferably a cone-shaped funnel, wider at the top and narrower at the bottom.

[0012] Preferably, the heat exchange tube is inclined along the airflow direction, and a capillary tube is provided inside the heat exchange tube.

[0013] Preferably, both ends of the hot air pipe and the waste heat pipe are fitted with flared ends by flange bolts. A hot air inlet is installed on the flared end of the hot air pipe, and a hot air fan is connected to the hot air inlet for supplying air into the hot air inlet. A waste heat inlet is connected to the flared end of the waste heat pipe, and the waste heat inlet is connected to the waste heat air outlet of the kiln. A lifting ring is installed on the heat exchange base.

[0014] Compared with the prior art, the present invention provides a counter-current heat exchange pipeline device for waste heat recovery in tile kilns, which has the following beneficial effects: The parts not mentioned in this device are the same as or can be implemented using existing technology. This invention sets a baffle with a heat exchange gap on the windward side of the heat exchange tube and uses the Venturi suction effect generated by the first and second guide arms in the figure-eight shape to form a first-stage self-circulating small vortex that is close to the tube wall in the heat exchange gap. The vortex boundary layer shear force continuously peels off the dust on the windward side, which not only blocks the direct impact of large dust particles, but also ensures sufficient convective heat exchange on the windward side. High-speed jets are generated through the nozzle gaps at the tails of the first and second guide arms, which converge on the leeward side of the heat exchange tubes to form a second-stage downward conveying vortex. This eliminates the inherent low-speed stagnation zone on the leeward side of traditional heat exchange tubes and removes ash from the leeward side through the dual action of high-speed airflow sweeping and centrifugal force stripping. Multiple sets of staggered heat exchange tubes and baffles form a continuous series of vortex chains in the two-stage vortex, which directionally transports dust from the waste heat inlet to the bottom collection system, avoiding secondary deposition of dust inside the heat exchanger. The heat exchange tubes are inclined along the airflow direction, which increases the effective heat exchange length in the waste heat flow; the capillary tubes inside the heat exchange tubes significantly increase the heat exchange surface area inside the tubes, while enhancing the turbulence of the fluid inside the tubes, further improving the heat transfer coefficient inside the tubes. The collection trough at the bottom of the heat exchange base adopts a cone-shaped design that is larger at the top and smaller at the bottom, which ensures that the dust flows by gravity and prevents the dust from being re-entrained. Attached Figure Description

[0015] Figure 1 This is a top view of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a schematic diagram of the heat exchange base frame of the present invention; Figure 4 This is a cross-sectional view of the present invention; Figure 5 This is a schematic diagram of the baffle structure in this invention; Figure 6 This is a schematic diagram of the solid plate structure in this invention; Figure 7 This is a schematic diagram of the staggered distribution of heat exchange tubes in this invention; Figure 8 This is a schematic diagram of the flow guide channel in this invention; Figure 9 This is a cross-sectional view of the baffle in this invention.

[0016] In the diagram: 1. Heat exchange base frame; 101. Trumpet mouth; 102. Hot air duct; 1021. Hot air inlet; 1022. Hot air blower; 103. Waste heat pipe; 1031. Waste heat inlet; 104. Lifting ring; 105. Collection port; 106. Collection trough; 2. Heat exchange fittings; 201. Capillary tube; 3. Baffle; 3001. Heat exchange gap; 3002. Nozzle gap; 301. First guide arm; 3011. Second guide arm; 302. Air inlet; 303. Guide plate; 304. Guide groove; 305. Solid plate. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Example 1: Refer to Figures 1-9 A counter-current heat exchange pipeline device for waste heat recovery in a tile kiln includes a heat exchange base 1, which is made entirely of carbon steel. The heat exchange base 1 consists of a hot air pipe 102 and a waste heat pipe 103 with upper and lower structures. Both ends of the hot air pipe 102 and the waste heat pipe 103 are fitted with flared ends 101 via flange bolts. A hot air inlet 1021 is installed on the flared end 101 of the hot air pipe 102, and a hot air fan 1022 is connected to the hot air inlet 1021 to supply air into it. The flared end 101 of the waste heat pipe 103 is connected to a waste heat inlet 1031, and the waste heat inlet 1031 is connected to the waste heat air outlet of the kiln. (Refer to...) Figure 2 The arrows indicate the direction of gas flow, and the gas flow direction in hot air pipe 102 is opposite to that in waste heat pipe 103. Furthermore, a filter screen is installed inside the waste heat inlet 1031 to filter out most of the particulate impurities in the hot air; To facilitate the transportation of the present invention, the hot air pipe 102 and the waste heat pipe 103 are set as separate parts, and a lifting ring 104 is installed on the heat exchange base frame 1 so that they can be lifted and welded on the site of use. Among them, reference Figure 1 Both the hot air duct 102 and the waste heat duct 103 are laser-drilled, and heat exchanger tubes 2 are installed in the holes by welding. In order to increase the heat exchange area of ​​the heat exchanger tubes 2, the heat exchanger tubes 2 are inclined along the airflow direction, and capillary tubes 201 are installed in the heat exchanger tubes 2 to ensure effective heat flow of the gas and liquid phases.

[0019] Reference Figure 7 Because the filter can only filter some large particles of impurities, during the flow of waste heat gas, residual small particles of impurities will gradually adhere to the windward surface of the heat exchanger 2 located on the waste heat pipe 103. These adhering small particles of impurities will affect the heat exchange efficiency of the windward surface of the heat exchanger 2. In current technology, a baffle is installed on the windward surface of the heat exchanger 2 to divert the small particles of impurities in front of the heat exchanger 2. However, correspondingly, the waste heat gas will not directly contact the windward surface of the heat exchanger 2 and will instead flow across the leeward surface. Its contact area with the heat exchanger 2 is small, and heat can only be transferred to the heat exchanger 2 through thermal radiation, affecting the heat exchange effect. Therefore, referring to… Figure 9In this invention, a baffle 3 is provided in the part of the heat exchange tube 2 located inside the waste heat tube 103. Multiple heat exchange tubes 2 are arranged in an alternating manner. The baffle 3 is located on the windward side of the heat exchange tube 2 and forms a heat exchange gap 3001 with the heat exchange tube 2. The width of the heat exchange gap 3001 is one-eighth to one-sixth of the diameter of the heat exchange tube 2. The baffle 3 is provided with a first guide arm 301 and a second guide arm 3011 arranged in a figure-eight shape. The first guide arm 301 and the second guide arm 3011 are used to guide the waste heat gas and use the Venturi effect to draw the airflow in the heat exchange gap 3001, so that the gas in the heat exchange gap 3001 flows, which solves the problem of small particulate impurities in the waste heat gas adhering to the windward side of the heat exchange tube 2. Reference Figure 7 , Figure 9 Because the gas tends to form turbulence on the leeward side of the heat exchange tube 2 after passing through the guide, small particulate impurities in the waste heat gas are easily attached to the leeward side of the heat exchange tube 2 due to the wind force, affecting the heat exchange efficiency. Therefore, the tails of the first guide arm 301 and the second guide arm 3011 of the present invention are arranged in an outward arc shape and face the leeward side of the heat exchange tube 2. The adjacent first guide arm 301 and the second guide arm 3011 have the same arc and form a nozzle gap 3002. The width of the nozzle gap 3002 is one-twelfth to one-tenth of the diameter of the heat exchange tube 2. After being guided by the figure-eight guide surface, the waste heat gas is accelerated at the nozzle gap 3002. When the high-speed airflow passes over the heat exchange gap opening on the leeward side of the heat exchange tube 2, a significant low-pressure area will be formed at the opening according to the Venturi effect, which will continuously draw out the gas in the heat exchange gap 3001. Because the windward side of heat exchange tube 2 is completely closed, gas can only be drawn in from the lower part and extracted from the upper part of heat exchange gap 3001. This creates a clockwise first-stage self-circulating small vortex with the same diameter as heat exchange tube 2, completely filling the entire gap. This small vortex rotates close to the windward side of heat exchange tube 2, breaking the adhesion between dust and the wall through the boundary layer shear force of the vortex. The dust is then carried to the center of the vortex by the airflow drag force and finally discharged from the leeward side opening with the suction airflow, achieving continuous scouring of the windward side without dead angles. At the same time, the high-speed jets ejected from the gaps between the upper and lower nozzles 3002 converge on the leeward side of heat exchange tube 2, and after mutual entrainment and merging, they form a second-stage downward conveying large vortex, covering the leeward side and both sides of the heat exchange tube. This large vortex rotates close to the leeward side, removing dust from the leeward side through the dual action of high-speed airflow sweeping around the vortex and centrifugal force peeling, completely eliminating the stagnant area on the leeward side. Reference Figure 7 , Figure 9The arrows in the figure indicate the direction of waste heat gas flow. In order to facilitate the diversion of vortex-shaped waste heat gas at the next baffle 3 and improve the uniformity of waste gas flow, an air inlet 302 is provided in the baffle 3 and a guide plate 303 is provided at the air inlet 302. Guide grooves 304 are provided in the first guide arm 301 and the second guide arm 3011. The two ends of the guide plate 303 are respectively facing the two guide grooves 304. At the same time, the gas flow channel in the nozzle gap 3002 and the guide groove 304 will be significantly smaller than the channel at its front end. The flow velocity of the waste heat gas will increase when it passes through this point, ensuring the formation of vortex-shaped airflow. Furthermore, refer to Figure 7 , Figure 8 , Figure 9 The portion of the guide channel 304 located on the first guide arm 301 and the second guide arm 3011 gradually decreases in size along the airflow direction and slopes downward. Solid plates 305 are provided above the guide channels 304 on both the first and second guide arms 301 and 3011, giving the two jets a downward velocity component. Combined with the constraint of the solid plates 305 on the upward diffusion of the vortex, this forces the second-stage large vortex to move downward along the inclined direction. The downward-moving large vortex completely encapsulates the dust-laden gas discharged from the heat exchange gap 3001 and the dust detached from the leeward side. The dust particles... Under the centrifugal force of the vortex, the dust is thrown towards the periphery of the vortex and gradually moves downward along the spiral trajectory of the vortex. When it passes the next solid plate 305, it flows to the next set of baffles 3. Multiple heat exchange tubes 2 are arranged in an alternating manner, so that the two-stage vortex forms a continuous series vortex chain in the waste heat tube 103. The dust-laden large vortex generated by the previous set of baffles 3 naturally flows into the guide plate 303 of the next set of baffles 3, is re-divided and accelerated, and then regenerates a new two-stage vortex, realizing the continuous directional transport of dust from the direction of waste heat flow. At the same time, the inclined heat exchange tubes 2 make the baffles 3 in front of them also inclined. Specifically, refer to Figure 4 The upper end of the heat exchange tube 2 is tilted to the left and the lower end is tilted to the right. At this time, the waste heat gas is generated from top to bottom in the vortex gas of the baffle 3 along the tilt direction, which promotes the movement of impurities. Simultaneously refer to Figure 4 A collection port 105 and a collection trough 106 are provided at the bottom of the heat exchange base frame 1. The collection port 105 is located on the leeward side of the heat exchange tube 2. Multiple collection ports 105 are connected to the collection trough 106 to collect impurities moving downward. Among them, reference Figure 4 The collection tank 106 is a cone-shaped bucket with a larger upper part and a smaller lower part. The bucket arm has an inclination angle of ≥60° and extends into the collection tank 106 to prevent small particulate impurities from flying up. Example 2: Refer to Figures 1-9 A counter-current heat exchange pipeline device for waste heat recovery in tile kilns, referring to Figure 2The hot air blower 1022 sends room temperature air into the hot air pipe 102 of the heat exchange base 1 through the hot air inlet 1021. The hot air flows from left to right along the axial direction of the hot air pipe 102. The dust-laden waste heat air discharged from the tile kiln enters the waste heat pipe 103 of the heat exchange base 1 through the waste heat inlet 1031. The waste heat gas flows from right to left along the axial direction of the waste heat pipe 103, forming a completely counter-current arrangement with the hot air in the hot air pipe 102. The filter screen in the waste heat inlet 1031 first intercepts large particulate impurities in the waste heat gas, reducing the risk of coarse particle wear and blockage on the surface of the subsequent heat exchange pipe fittings 2. The heat from the waste heat gas is transferred to the heat exchange medium inside the heat exchange tube 2 through the tube wall, and then transferred to the hot air to be heated in the hot air duct 102 through the heat exchange medium. The heat exchange tube 2 is inclined along the airflow direction, which increases the effective heat exchange length in the waste heat airflow. The capillary tube 201 installed inside the heat exchange tube 2 significantly increases the heat exchange surface area inside the tube, and at the same time enhances the turbulence of the fluid inside the tube, which greatly improves the overall heat transfer coefficient. The heated hot air is discharged from the bell mouth 101 at the other end of the hot air duct 102 and sent to the blank drying system of the tile kiln for direct use. The cooled clean waste heat gas is discharged into the atmosphere through the bell mouth 101 at the other end of the waste heat pipe 103 by the induced draft fan. After the waste heat gas enters the waste heat pipe 103, it first comes into contact with the first set of staggered heat exchange pipes 2 and the baffle 3 on its windward side. The first guide arm 301 and the second guide arm 3011 of the baffle 3 divide the incoming waste heat gas into three streams: two streams flow along the outside of the guide arm, and one stream enters the interior through the air inlet 302 in the center of the baffle 3. When the gas passes through the nozzle gap 3002 at the tail of the first guide arm 301 and the second guide arm 3011, it is accelerated due to the sudden reduction of the channel cross-sectional area. When the high-speed airflow sweeps over the opening of the heat exchange gap 3001 on the leeward side of the heat exchange tube 2, a significant low-pressure zone is formed at the opening. The low-pressure zone continuously draws the gas in the heat exchange gap 3001 upward. Since the windward side of the heat exchange gap 3001 is completely closed, the gas can only be drawn in from the lower part of the gap and drawn out from the upper part. Thus, a clockwise first-stage self-circulating small vortex with the same diameter as the heat exchange tube 2 and completely filling the entire gap is formed in the closed gap. The small vortex rotates at high speed close to the windward side of the heat exchange tube 2. The shear force of the vortex boundary layer destroys the adhesion between the dust and the tube wall. Then, the airflow drags the detached dust to the center of the vortex and finally discharges it from the leeward side opening with the suction airflow, achieving continuous scouring of the windward side without dead angles. The high-speed jets ejected from the gaps 3002 between the upper and lower nozzles converge on the leeward side of the heat exchange tube 2. After the two high-speed jets are mutually entrained and merged, they form a second-stage downward conveying vortex covering the leeward side and the areas on both sides of the heat exchange tube 2. This eliminates the inherent low-speed stagnation zone on the leeward side of the traditional heat exchange tube 2. The vortex rotates closely against the leeward side of the heat exchange tube 2. Through the dual action of sweeping by the surrounding high-speed airflow and centrifugal force stripping, it removes the accumulated dust on the leeward side and the sides. At the same time, the vortex completely encapsulates the dust-laden gas discharged from the heat exchange gap 3001, preventing the dust from diffusing and depositing again inside the heat exchanger. Because the heat exchange tubes 2 are inclined to the left at the top and to the right at the bottom along the airflow direction, and multiple sets of heat exchange tubes 2 are arranged in an alternating manner, the two-stage vortex will form a continuous series of vortex chains, realizing the directional transport of dust along the airflow direction. Specifically, the guide grooves 304 in the first guide arm 301 and the second guide arm 3011 gradually decrease in size and tilt downward along the airflow direction, so that the upper and lower jets themselves have a downward velocity component; at the same time, the solid plate 305 at the corresponding position of the guide groove 304 constrains the vortex to diffuse upward, forcing the second The large vortex moves downward along the inclined direction. The dust-laden vortex naturally flows into the air inlet 302 in the center of the next set of baffles 3. It is then divided into two streams by the guide plate 303 at the air inlet 302. The streams enter the guide channels 304 on both sides and are accelerated again, generating new double-stage vortices. The multiple sets of staggered heat exchange tubes 2 and baffles 3 make the above process repeat, forming a continuous series of vortex chains in the waste heat pipe 103, which directionally transports the dust from the waste heat inlet 1031 end to the bottom of the waste heat pipe 103. When the dust-laden vortex passes through the collection port 105 at the bottom of the heat exchange base 1, the large dust particles on the periphery of the vortex are separated from the vortex and enter the collection port 105 under the combined action of gravity and centrifugal force. All collection ports 105 are connected to the collection trough 106 at the bottom of the heat exchange base 1. The collection trough 106 adopts a cone-shaped design with a larger top and a smaller bottom, and the angle of the bucket arm is ≥60°, which can ensure that the dust flows by gravity and prevent the dust from being rolled up again by the airflow after accumulation. A manual or automatic ash discharge valve can be installed at the bottom of the collection tank 106 for periodic ash removal.

[0020] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A counter-current heat exchange pipeline device for waste heat recovery in a tile kiln, comprising a heat exchange base (1), wherein the heat exchange base (1) includes a hot air pipe (102), a waste heat pipe (103), and a plurality of heat exchange pipe fittings (2) for penetrating the hot air pipe (102) and the waste heat pipe (103), characterized in that: The waste heat pipe (103) is provided with a baffle (3), and multiple heat exchange pipes (2) are arranged in an alternating manner. The baffle (3) is located on the windward side of the heat exchange pipe (2) and forms a heat exchange gap (3001) with the heat exchange pipe (2). The baffle (3) is provided with a first guide arm (301) and a second guide arm (3011) in a figure-eight shape. The first guide arm (301) and the second guide arm (3011) are used to guide the waste heat gas so that the gas in the heat exchange gap (3001) can flow. The tails of the first guide arm (301) and the second guide arm (3011) are arranged in an outward arc shape. The adjacent first guide arm (301) and the second guide arm (3011) have the same arc and form a nozzle gap (3002). The baffle (3) is provided with an air inlet (302) and a guide plate (303) is provided at the air inlet (302). A guide groove (304) is provided in both the first guide arm (301) and the second guide arm (3011). The two ends of the guide plate (303) are respectively facing the two guide grooves (304).

2. The counter-current heat exchange pipeline device for waste heat recovery in tile kilns according to claim 1, characterized in that, The width of the heat exchange gap (3001) is one-eighth to one-sixth of the diameter of the heat exchange tube (2).

3. The counter-current heat exchange pipeline device for waste heat recovery in tile kilns according to claim 1, characterized in that, The width of the nozzle gap (3002) is one-twelfth to one-tenth of the diameter of the heat exchange tube (2).

4. The counter-current heat exchange pipeline device for waste heat recovery in tile kilns according to claim 1, characterized in that, The portion of the flow channel (304) located on the first flow arm (301) and the second flow arm (3011) gradually decreases in size along the airflow direction and tilts downward. Furthermore, a solid plate (305) is provided on the upper part of the flow channel (304) on both the first flow arm (301) and the second flow arm (3011).

5. The counter-current heat exchange pipeline device for waste heat recovery in tile kilns according to claim 4, characterized in that, The bottom of the heat exchange base (1) is provided with a collection port (105) and a collection trough (106). The collection port (105) is located on the leeward side of the heat exchange pipe fitting (2), and multiple collection ports (105) are connected to the collection trough (106).

6. The counter-current heat exchange pipeline device for waste heat recovery in tile kilns according to claim 5, characterized in that, The collection trough (106) is a cone-shaped bucket that is wider at the top and narrower at the bottom.

7. The counter-current heat exchange pipeline device for waste heat recovery in tile kilns according to claim 1 or 4, characterized in that, The heat exchange tube (2) is inclined along the airflow direction, and a capillary tube (201) is provided inside the heat exchange tube (2).

8. The counter-current heat exchange pipeline device for waste heat recovery in tile kilns according to claim 7, characterized in that, Both ends of the hot air pipe (102) and the waste heat pipe (103) are fitted with bell mouths (101) by flange bolts. A hot air inlet (1021) is installed on the bell mouth (101) of the hot air pipe (102). The hot air inlet (1021) is connected to a hot air blower (1022) for blowing air into the hot air inlet (1021). The bell mouth (101) of the waste heat pipe (103) is connected to a waste heat inlet (1031). The waste heat inlet (1031) is connected to the waste heat air outlet of the kiln. Among them, a lifting ring (104) is installed on the heat exchange base (1).

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