Assembly type segmented heat pipe heat exchanger for dust-containing flue gas waste heat recovery

Abstract

The invention relates to the technical field of tubular heat exchange, in particular to an assembly type segmented heat pipe heat exchanger for dust-containing flue gas waste heat recovery. Comprising a heater and a condenser; the heater is arranged in a dust-containing high-temperature process flue gas channel and absorbs flue gas waste heat, so that a working medium in a heating pipe of the heater is evaporated; the condenser is arranged in the cooling medium channel and transfers heat to a cooling medium, so that a working medium in a condensation pipe of the condenser is condensed; the pipe diameter of the heating pipe is larger than that of the condensation pipe; the number of the heating pipes is smaller than that of the condensation pipes; the heater is connected with the condenser through a circulating pipeline; according to the heat pipe heat exchanger, the condensation pipe of the condenser is designed to be small in pipe diameter, the heating pipe of the heater is designed to be large in pipe diameter, and therefore the heat pipe heat exchanger can meet the efficient heat exchange effect, and meanwhile the dust accumulation and blocking risks are reduced.

Description

Technical Field

[0001] This invention relates to the field of tubular heat exchange technology, specifically to an assembled segmented heat pipe heat exchanger for waste heat recovery from dusty flue gas. Background Technology

[0002] Heat pipe heat exchangers, as a highly efficient heat transfer element, have been widely used in industrial waste heat recovery. They have advantages such as high heat transfer efficiency, compact structure, separation of hot and cold fluids, and the ability to control wall temperature by adjusting the area to avoid corrosion. However, traditional heat pipe heat exchangers face a dilemma when dealing with process flue gas containing a large amount of dust particles (such as in metallurgy, building materials, and chemical industries): a. To prevent blockage and wear on the flue gas side (evaporation section), a larger pipe diameter and fewer fins are usually required, but this results in a large overall size of the heat exchanger and a limited heat transfer area per unit volume; b. If a small-diameter, densely finned design is used to pursue high heat transfer density, dust accumulation and blockage are very likely to occur on the flue gas side, seriously affecting the long-term stable operation of the equipment; In existing technologies, although there are integral and separate structures, most of them are designed with a uniform pipe diameter, making it difficult to simultaneously meet the requirements of "anti-blockage" and "high compactness," especially in flue gas waste heat recovery scenarios at medium temperatures (e.g., 200℃-500℃), this contradiction is even more prominent; c. After long-term use, the heat pipes of integrally designed heat pipe heat exchangers, especially the inner heat exchange tubes, are prone to damage and need to be replaced. The replacement process requires shutdown, affecting the work progress. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention proposes a prefabricated segmented heat pipe heat exchanger for waste heat recovery from dusty flue gas. This invention overcomes the contradiction between the difficulty of existing heat pipe heat exchangers in balancing anti-clogging and large heat exchange area when treating dusty flue gas, and provides a dedicated heat pipe heat exchanger with compact structure, strong anti-clogging ability, high heat exchange efficiency and easy maintenance.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: An assembled segmented heat pipe heat exchanger for waste heat recovery from dusty flue gas, comprising a heater and a condenser; the heater is placed in a dusty high-temperature process flue gas channel to absorb waste heat from the flue gas, causing the working medium inside the heater's heating tube to evaporate; the condenser is placed in a cooling medium channel to transfer heat to the cooling medium, causing the working medium inside the condenser's condensing tube to condense; the diameter of the heating tube is larger than the diameter of the condensing tube; the number of heating tubes is less than the number of condensing tubes; the heater and the condenser are connected by a circulation pipe.

[0005] Preferably, the heater includes conical shrouds at both ends and a central housing; the housing is fixedly connected to the conical shrouds at both ends; a drain connector is provided at the lower inner side of each conical shroud; a replacement slot is provided on the front side of the housing; an upper outlet hole corresponding to the upper end of the heating tube is provided on the top wall of the replacement slot; an upper connector communicating with the upper outlet hole is provided on the upper surface of the housing; a lower outlet hole corresponding to the lower end of the heating tube is provided on the bottom wall of the replacement slot; a lower connector communicating with the lower outlet hole is provided on the lower surface of the housing; multiple flue gas slots communicating with the replacement slot are provided through the left and right sides of the housing; the multiple flue gas... The slots are evenly distributed in the front-to-back direction and aligned with the heating tubes; the flue gas slots are connected to the cone hood; the bottom of the replacement slot is provided with a clearance slot; the inner side of the replacement slot is slidably sealed to a shielding box with a front opening; the bottom of the clearance slot and the shielding box are connected by a first spring; the top and bottom of the shielding box are respectively provided with an upper shielding hole and a lower shielding hole; the shielding box is provided with a side shielding slot running through it on the left and right sides; the shielding box is slidably connected to a vertical bar in the front and back; the rear side of the vertical bar is fixedly connected to a horizontal bar; the heating tube is connected to the horizontal bar; the left and right sides of the shielding box are provided with spare slots near the edge of the first spring.

[0006] Preferably, the front opening of the shielding box has a notch at the upper position; the upper end of the vertical bar extends into the notch; the upper end of the vertical bar has an upper movable groove facing downward; an upper locking bar is slidably connected in the upper movable groove; a toggle groove is provided at the lower end of the upper movable groove facing forward; a toggle block fixedly connected to the upper locking bar is slidably connected in the toggle groove; a second spring connects the lower end of the upper locking bar and the lower end of the upper movable groove; and an upper locking groove for inserting the upper locking bar is provided on the upper inner wall of the replacement slot.

[0007] Preferably, the horizontal bar has a through hole running vertically; multiple through holes are evenly distributed front and back; the through holes are movably connected to heating tubes; the through holes have a threaded stepped hole facing right; the stepped hole is internally threaded to a first bolt; and flue gas passes through the housing from left to right.

[0008] Preferably, the lower end of the vertical bar is provided with a lower movable groove facing upward; the lower movable groove is connected to the upper movable groove through a rotating groove; a lower locking bar with lower teeth is slidably connected in the lower movable groove; a gear is rotatably connected in the rotating groove; the gear simultaneously meshes the lower teeth on the lower locking bar and the upper teeth on the upper locking bar; the lower surface of the shielding box is provided with a lower slot for the lower locking bar to be inserted.

[0009] Preferably, the inner wall of the lower slot is provided with an auxiliary groove; an auxiliary block is slidably connected in the auxiliary groove; the lower surface of the auxiliary block is connected to the bottom of the auxiliary groove by an auxiliary spring; a lower insertion block fixedly connected to the auxiliary block is slidably connected in the lower slot; and a lower locking groove for inserting the lower insertion block is provided on the lower inner wall of the replacement slot.

[0010] Preferably, a drive groove is provided on the rear surface of the shielding box; a drive block is slidably and sealed within the drive groove; the drive block is connected to the bottom of the drive groove via a third spring; driven grooves corresponding to the heating tube are provided on the upper and lower inner sides of the shielding box; the driven groove is annular; a driven ring is slidably and sealed within the driven groove; the driven groove and the bottom of the drive groove are connected via a liquid hole.

[0011] Preferably, the heating tube has annular sealing grooves at its upper and lower ends; the driven ring can be inserted into the sealing grooves.

[0012] Preferably, the condenser structure is the same as the heater structure, and heat sinks are installed on the outer wall of the condenser tube in the condenser.

[0013] The beneficial effects of this invention are as follows: 1. This invention uses a small-diameter condenser tube and a large-diameter heater tube, thereby enabling the heat pipe heat exchanger to achieve high-efficiency heat exchange while reducing the risk of dust accumulation and blockage.

[0014] 2. In the process of replacing the heating tube in the corresponding shielding box, the bottom part of the replacement slot of the shielding box is connected to the activated spare slot, so as to ensure the smooth flow of flue gas in the entire heat pipe heat exchanger and ensure that the operation of the heat pipe heat exchanger is not interrupted.

[0015] 3. The present invention locks the vertical strip into the replacement slot by locking the upper strip, thereby making the heating tube more stable in the shielding box and the replacement slot, thus ensuring that the flue gas can pass through the shielding box smoothly and contact the heating tube for heat transfer, thereby improving the stability of the heat pipe heat exchanger. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the first connection method for the heat pipe heat exchanger of the present invention; Figure 2 This is a second connection diagram of the heat pipe heat exchanger of the present invention; Figure 3 This is a schematic diagram of the third connection method for the heat pipe heat exchanger of the present invention; Figure 4 This is a perspective view of the heater in this invention; Figure 5 This is a structural diagram of the single-piece box in this invention; Figure 6 This is a diagram showing the positions of the clearance groove and the lower outlet hole in this invention; Figure 7 This is a perspective view of the shielding box in this invention; Figure 8 yes Figure 7Another perspective 3D view; Figure 9 This is a structural diagram of the inner side of the shielding box in this invention; Figure 10 This is a perspective view of the heating element and the horizontal bar in this invention; Figure 11 This is a perspective view of the upper and lower locking bars in this invention; Figure 12 This is a cross-sectional view of the upper and lower locking bars of the present invention; Figure 13 yes Figure 12 Enlarged view of point A in the middle; Figure 14 This is a cross-sectional view of the box body in this invention; Figure 15 yes Figure 14 Enlarged view of point B in the middle; Figure 16 This is a cross-sectional view of the horizontal bar in this invention.

[0018] In the diagram: 1. Cone shroud; 11. Drain connector; 2. Housing; 21. Replacement slot; 22. Upper outlet; 23. Upper connector; 24. Lower outlet; 25. Lower connector; 26. Flue gas trough; 27. Clearance slot; 28. Upper retaining slot; 29. ​​Lower retaining slot; 3. Heating tube; 31. Sealing slot; 4. Shielding box; 40. Driven slot; 41. First spring; 42. Upper shielding hole; 43. Lower shielding hole; 44. Side shielding slot; 45. Spare slot; 46. Missing slot; 47. Lower slot. 7. Auxiliary groove 471, auxiliary block 472, auxiliary spring 473, lower insert block 48, drive groove 49, liquid hole 491, vertical bar 5, upper movable groove 51, upper locking bar 52, shift groove 53, shift block 54, second spring 55, lower movable groove 56, rotating groove 57, lower locking bar 58, gear 59, horizontal bar 6, pipe hole 61, stepped hole 62, first bolt 63, drive block 7, third spring 71, driven ring 8. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] like Figures 1 to 16 As shown, the present invention includes the following embodiments: Example 1: A prefabricated segmented heat pipe heat exchanger for waste heat recovery from dusty flue gas includes a heater and a condenser. The heater is placed in a dusty high-temperature process flue gas channel to absorb waste heat from the flue gas, causing the working medium in the heating tube 3 of the heater to evaporate. The condenser is placed in a cooling medium channel to transfer heat to the cooling medium, causing the working medium in the condenser tube to condense. The diameter of the heating tube 3 is larger than the diameter of the condenser tube. The number of heating tubes 3 is less than the number of condenser tubes. The heater and the condenser are connected by a circulation pipe.

[0021] The heater and condenser are connected via a detachable structure, such as a flange, thread, or quick coupling. The heater uses a larger diameter heating tube 3 (relative to the condenser tube). The outer wall of the heating tube 3 can be equipped with sparse, wear-resistant straight fins or nail-head fins, or it can be smooth without fins. The main purpose is to ensure sufficient flow cross-section, prevent flue gas particles from adhering and clogging, and resist particle erosion and wear. The cooling medium can be air or water. Compared to the heating tube 3, the condenser tube uses a smaller diameter. The outer wall of the condenser tube is equipped with high-density fins with a low fin spacing, such as spiral fins or serrated fins. The main purpose is to... The heat dissipation area is greatly expanded within a limited space, enhancing heat exchange and thus improving the compactness and heat exchange efficiency of the whole unit. The heating tube 3 and the condenser tube are interconnected in a vacuum environment and filled with a working medium suitable for the medium temperature range (such as thermal conductivity A, water, etc.) to achieve efficient heat transfer. The working medium can be selectively replaced with NH3, water, and ethanol according to the flue gas temperature. In addition, flexible expansion joints or sealing sleeves are set at the connection between the heating tube 3 and the condenser tube to compensate for the thermal stress caused by the temperature difference and ensure sealing. The entire heat exchanger can be designed as a combination structure of multiple "evaporation section-condensation section" units connected in parallel or in series.

[0022] Taking the recovery of waste heat from the process flue gas (temperature approximately 400℃, high dust content) of a chemical plant to produce hot water as an example, the evaporator uses Φ38mm stainless steel tubes (without fins) as heating tubes 3, with a length of 1.5 meters, connected to the flue through flanges, and the tube bundles are arranged sparsely; the condenser tubes use Φ25mm carbon steel tubes with externally rolled high-density aluminum fins (fin ratio >10), with a length of 2 meters. When installed inside the hot water tank, Φ4mm steel tubes are used. The steel tube materials include: 304, 32168, 316L, TA2, etc., which can be selected. The external expansion is integral with fins, and the fin materials include: aluminum, 304, etc., thereby maximizing the overall heat transfer coefficient.

[0023] High-temperature, dusty flue gas washes over the heating tubes 3 of the heater. The working medium inside the heating tubes 3 evaporates or is heated and flows to the condenser. The condenser tubes transfer heat to the water in the heating water tank through dense fins. At the same time, the temperature of the working medium inside the condenser tubes decreases or liquefies. The condensed working medium flows back to the heating tubes 3 of the heater by gravity, and the cycle continues. A condensate drain is provided on the inner wall of the heater. Most of the flue gas emission carries water vapor, which condenses into water droplets after passing over the surface of the heating tubes 3. The water droplets contain dust and impurities and are finally discharged along the condensate drain. The heater is a tube box composed of multiple large-diameter heating tubes 3, placed in the flue. The outer wall of the heating tubes 3 can be optionally equipped with sparse nail-head tubes to prevent abrasion and dust removal. The condenser tubes are multiple independent small-diameter dense finned tube bundle modules, placed in the air supply duct. The heater and each condenser are connected by quick connectors with flexible metal corrugated pipes to form multiple independent heat pipe loops. This design facilitates isolation and maintenance when a single loop is damaged.

[0024] Compared with existing technologies, this invention has the following significant advantages: a. High efficiency and compactness: The condenser tubes use small diameter pipes with densely packed fins on the surface, achieving a larger heat exchange area per unit volume, making the overall structure more compact and reducing the equipment's footprint and space requirements; b. Anti-clogging and wear-resistant: The evaporation section uses large diameter pipes with smooth surfaces, effectively reducing flue gas flow resistance, significantly reducing dust deposition and clogging risks, and extending the equipment's operating cycle and maintenance intervals under harsh conditions; c. Flexible and reliable: The modular segmented structure allows the evaporation section (easily worn part) and the condensation section (high-efficiency heat exchange part) to be designed, manufactured, replaced, and maintained independently, thus reducing maintenance costs; d. Wide applicability: It is particularly suitable for waste heat recovery scenarios of medium-temperature (e.g., 200-500℃) dusty process flue gas, such as sintering machine flue gas, cement kiln tail gas, and chemical process gas, maximizing heat energy recovery while ensuring operational reliability.

[0025] Example 2: The heater includes cone-shaped covers 1 at both ends and a housing 2 in the middle; the housing 2 is fixedly connected to the cone-shaped covers 1 at both ends; a drain connector 11 is provided at the lower position of the inner side of the cone-shaped covers 1; a replacement groove 21 is provided on the front side of the housing 2; an upper outlet hole 22 corresponding to the upper end of the heating tube 3 is provided on the top wall of the replacement groove 21; an upper connector 23 communicating with the upper outlet hole 22 is provided on the upper surface of the housing 2; a lower outlet hole 24 corresponding to the lower end of the heating tube 3 is provided on the bottom wall of the replacement groove 21; a lower connector 25 communicating with the lower outlet hole 24 is provided on the lower surface of the housing 2; multiple flue gas grooves 26 communicating with the replacement groove 21 are provided through the left and right sides of the housing 2; the multiple flue gas grooves 26 The slots 26 are evenly distributed in the front-to-back direction and aligned with the heating tubes 3; the flue gas slots 26 are connected to the cone shroud 1; the bottom of the replacement slot 21 is provided with a clearance slot 27; the inner side of the replacement slot 21 is slidably sealed to the front-opening shield box 4; the bottom of the clearance slot 27 is connected to the shield box 4 by a first spring 41; the top and bottom of the shield box 4 are respectively provided with an upper shielding hole 42 and a lower shielding hole 43; the shield box 4 is provided with a side shielding slot 44 running through it on the left and right sides; the shield box 4 is slidably connected to a vertical bar 5 in the front and back; the rear side of the vertical bar 5 is fixedly connected to a horizontal bar 6; the heating tube 3 is connected to the horizontal bar 6; the left and right sides of the shield box 4 are provided with spare slots 45 near the edge of the first spring 41.

[0026] In this embodiment, a notch 46 is provided at the upper position of the front opening of the shielding box 4; the upper end of the vertical bar 5 extends into the notch 46; an upper movable groove 51 is provided at the upper end of the vertical bar 5 facing downward; an upper locking bar 52 is slidably connected in the upper movable groove 51; a toggle groove 53 is provided at the lower end of the upper movable groove 51 facing forward; a toggle block 54 fixedly connected to the upper locking bar 52 is slidably connected in the toggle groove 53; a second spring 55 connects the lower end of the upper locking bar 52 and the lower end of the upper movable groove 51; an upper locking groove 28 for inserting the upper locking bar 52 is provided on the upper inner wall of the replacement groove 21.

[0027] The two adjacent upper outlet holes 22 are interconnected, and the two adjacent lower outlet holes 24 are interconnected. The number of upper connectors 23 and lower connectors 25 is set according to requirements. The flue gas enters the left-hand cone shroud 1 from left to right, and then enters the flue gas trough 26 along the left-hand cone shroud 1. In the working state, the shielding box 4 is in the rear position in the replacement slot 21. The side shielding groove 44 on the shielding box 4 is aligned with the flue gas trough 26. The upper shielding hole 42 on the top of the shielding box 4 is aligned with the upper outlet hole 22, and the lower shielding hole 43 at the bottom of the shielding box 4 is aligned with the lower outlet hole 24. The front opening of the replacement slot 21 is shielded by the front port of the shielding box 4 and the vertical bar 5. The flue gas enters the inside of the shielding box 4 along the flue gas trough 26 and the side shielding groove 44. The flue gas impacts the heating tube 3, and the working medium flows from bottom to top. The working medium passes through the lower connector 25 and flows along the lower outlet 24, lower shielding hole 43, heating tube 3, upper shielding hole 42, upper outlet 22, and upper connector 23. The working medium inside the heating tube 3 absorbs the heat from the flue gas on the outer wall of the heating tube 3. The working medium vaporizes or decreases in density due to heat and moves upward. The working medium containing heat flows along the upper connector 23 to the top of the condenser and finally passes through the condenser tube from top to bottom. The gas or water to be heated comes into contact with the condenser tube, and the working medium inside the condenser tube transfers heat to the medium to be heated on the outside through the condenser tube, realizing heat transfer. The temperature of the working medium inside the condenser tube decreases or it directly liquefies. The working medium in the condenser tube flows back to the lower connector 25. This cycle is repeated to realize the waste heat recovery process of the flue gas.

[0028] When the heating element 3 needs to be replaced, the toggle block 54 is moved down along the toggle groove 53. During the downward movement of the toggle block 54, the upper locking bar 52 moves along the upper movable groove 51. The upper locking bar 52 moves down, and the upper end of the upper locking bar 52 is pulled out from the upper slot 28, thus unlocking the vertical bar 5 from the replacement slot 21. The first spring 41 transmits the elastic force to the shielding box 4. Under the action of the elastic force, the shielding box 4 moves forward along the replacement slot 21. During the forward movement of the shielding box 4, it pushes the inner horizontal bar 6 and vertical bar 5 forward. During the forward movement of the shielding box 4, it also moves the spare slot 45, the side shielding slot 44, the upper shielding hole 42, and the lower shielding hole 43 forward. After the upper shielding hole 42 moves forward with the shielding box 4, it connects with the corresponding upper outlet hole 22. The upper outlet 22 is blocked by the obstruction box 4. The lower obstruction hole 43 is also blocked by the obstruction box 4 after it moves forward. The side obstruction groove 44 is also blocked by the obstruction box 4 after it moves forward. The spare groove 45 is also blocked by the obstruction box 4 after it moves forward. This way, except for the flue gas groove 26 connected to the spare groove 45, the flue gas grooves 26 in other positions are blocked by the obstruction box 4 after it moves forward, which prevents the flue gas from leaking out. The flue gas passing through the adjacent obstruction box 4 will enter the bottom of the replacement groove 21 along the unblocked flue gas groove 26. The flue gas will flow into another spare groove 45 along the bottom of the replacement groove 21 and then transition from the other spare groove 45 to the next obstruction box 4.

[0029] During the replacement of the heating tube 3 in the corresponding shield box 4, the bottom of the replacement slot 21 of the shield box 4 is connected to the activated spare slot 45, ensuring smooth flue gas flow throughout the heat pipe heat exchanger and preventing interruption of its operation. Then, without moving forward, the shield box 4 is engaged, and the vertical bar 5 moves forward. During this movement, the horizontal bar 6 moves forward, causing the heating tubes 3 connected to it to move forward as well. This allows the heating tubes 3 to emerge sequentially from the inside of the shield box 4. After the lower end of the heating tube 3 detaches from the lower inner wall of the replacement slot 21, the working medium inside the heating tube 3 flows out directly. After the replacement of multiple heating tubes 3, the horizontal bar 6, and the vertical bar 5 is completed, the heating tubes 3 on the horizontal bar 6 are moved back and inserted into the shield box 4. During the process of the heating tube 3 entering the shield box 4, the working medium inside the heating tube 3 can be replenished through the notch 46 until the horizontal bar 6 abuts against the bottom wall of the shield box 4. After the vertical bar 5 enters the notch 46, the upper end of the heating tube 3 connects to the upper shielding hole 42, and the lower end of the heating tube 3 connects to the lower shielding hole 43. Pressing the vertical bar 5 will cause the horizontal bar 6 to move backward. During the backward movement of the horizontal bar 6, the shielding box 4 will move backward. During the backward movement of the shielding box 4, the first spring 41 will be compressed. During the backward movement of the shielding box 4, the spare slot 45, the side shielding slot 44, the upper shielding hole 42, and the lower shielding hole 43 will move backward. The upper shielding hole 42 will then move backward. The heating tube 3 is moved back and aligned with the corresponding upper outlet hole 22, so that the upper end of the heating tube 3 is connected with the upper shielding hole 42 and the upper outlet hole 22. The lower shielding hole 43 is moved back and aligned with the corresponding lower outlet hole 24, so that the lower end of the heating tube 3 is connected with the lower shielding hole 43 and the lower outlet hole 24. The spare slot 45 is moved back and offset from the flue gas slot 26 in the rear position. The side shielding slot 44 is moved back and realigned with the corresponding flue gas slot 26. The vertical bar 5 is also fully inserted into the replacement slot 21.

[0030] Subsequently, the second spring 55 pushes the upper locking bar 52 upward. As the upper locking bar 52 moves upward along the upper movable groove 51, the upper end of the upper locking bar 52 will insert into the upper locking groove 28, thereby locking the vertical bar 5 with the replacement groove 21. This allows the flue gas to directly pass through the flue gas groove 26 and the side shielding groove 44 into the inside of the shielding box 4 and contact the heating tube 3. Finally, it flows out from the heating tube 3 to the inside of the next shielding box 4. The working medium of the lower connector 25 then flows along the lower outlet hole 24, the lower shielding hole 43, the heating tube 3, the upper shielding hole 42, the upper outlet hole 22, and the upper connector 23. The upper locking bar 5 is locked into the replacement groove 21 by the upper locking bar 52, thereby making the heating tube 3 more stable in the shielding box 4 and the replacement groove 21, thus ensuring that the flue gas can smoothly pass through the shielding box 4 and contact the heating tube 3 for heat transfer, improving the stability of the heat pipe heat exchanger.

[0031] Example 3: The horizontal bar 6 is provided with pipe holes 61 running through it vertically; multiple pipe holes 61 are evenly distributed front and back; the pipe holes 61 are movably connected to the heating tube 3; the pipe holes 61 are provided with a threaded stepped hole 62 facing to the right; the stepped hole 62 is internally threaded and connected to the first bolt 63; the flue gas passes through the box 2 from left to right.

[0032] After the horizontal bar 6 moves multiple heating tubes 3 out of the inner side of the shield box 4 in sequence, the first bolt 63 is turned to disengage the end of the first bolt 63 from the outer wall of the corresponding heating tube 3, thereby unlocking the outer wall of the heating tube 3 from the first bolt 63. Then, the heating tube 3 is pulled out from the inner side of the corresponding tube hole 61 to remove and replace the corresponding heating tube 3. After the heating tube 3 is inserted into the tube hole 61, the first bolt 63 is tightened so that the first bolt 63 abuts against the outer wall of the corresponding heating tube 3, thereby locking the horizontal bar 6 to the heating tube 3.

[0033] Example 4: The lower end of the vertical bar 5 is provided with a lower movable groove 56 facing upward; the lower movable groove 56 is connected to the upper movable groove 51 through a rotating groove 57; a lower locking bar 58 with lower teeth is slidably connected in the lower movable groove 56; a gear 59 is rotatably connected in the rotating groove 57; the gear 59 simultaneously meshes the lower teeth on the lower locking bar 58 and the upper teeth on the upper locking bar 52; the lower surface of the shielding box 4 is provided with a lower slot 47 for the lower locking bar 58 to be inserted.

[0034] In this embodiment, the inner wall of the lower slot 47 is provided with an auxiliary groove 471; an auxiliary block 472 is slidably connected in the auxiliary groove 471; the lower surface of the auxiliary block 472 is connected to the bottom of the auxiliary groove 471 by an auxiliary spring 473; a lower insertion block 48 is slidably connected in the lower slot 47 and fixedly connected to the auxiliary block 472; and a lower card slot 29 for inserting the lower insertion block 48 is provided on the lower inner wall of the replacement slot 21.

[0035] As the vertical bar 5 moves the shielding box 4 backward, the vertical bar 5 enters the replacement slot 21. Then, the lever 54 is released, and the second spring 55 pushes the upper locking bar 52 upward. The upper end of the upper locking bar 52 inserts into the upper slot 28. During the upward movement of the upper locking bar 52, the upper teeth move upward synchronously. The gear 59 simultaneously meshes with the upper and lower teeth, so the upper locking bar 52 drives the gear 59 to rotate. The rotating gear 59 drives the lower locking bar 58 downward. During the downward movement of the lower locking bar 58, it moves along the lower movable slot 56. The lower end of the lower locking bar 58 inserts into the lower slot 47, locking the lower locking bar 58 with the shielding box 4. During the process of the lower end of the lower locking bar 58 entering the lower slot 47, the lower insert block 48 is compressed along... The lower slot 47 is moved out and inserted into the lower slot 29, thus locking the shield box 4 and the replacement slot 21, further improving the stability of the shield box 4 and the heating tube 3 in the replacement slot 21. When it is necessary to remove and replace the heating tube 3, the toggle block 54 moves the upper locking bar 52 down, and the lower locking bar 58 moves up. The lower locking bar 58 is pulled out of the lower slot 47 at the lower end, and the auxiliary spring 473 pushes the auxiliary block 472 up. The auxiliary block 472 will drive the lower insertion block 48 to move out of the lower slot 29. The lower insertion block 48 returns to the lower slot 47, thus unlocking the shield box 4 and the replacement slot 21, unlocking the shield box 4 and the vertical bar 5, and unlocking the vertical bar 5 and the replacement slot 21. This makes it easier for the vertical bar 5 to be removed from the shield box 4 and the shield box 4 to extend out of the replacement slot 21.

[0036] Example 5: A drive groove 49 is provided on the rear surface of the shielding box 4; a drive block 7 is slidably and sealed within the drive groove 49; the drive block 7 is connected to the bottom of the drive groove 49 by a third spring 71; driven grooves 40 corresponding to the heating tube 3 are provided on the upper and lower sides of the inner side of the shielding box 4; the driven groove 40 is annular; a driven ring 8 is slidably and sealed within the driven groove 40; the driven groove 40 and the bottom of the drive groove 49 are connected by a liquid hole 491.

[0037] In this embodiment, the heating tube 3 is provided with annular sealing grooves 31 at its upper and lower ends; the driven ring 8 can be inserted into the sealing grooves 31.

[0038] After the horizontal bar 6 and vertical bar 5 drive the heating tube 3 to the limit position of the shielding box 4, the sealing grooves 31 at the upper and lower ends of the heating tube 3 align with the driven groove 40. Then, the vertical bar 5 and the shielding box 4 are controlled to move backward as a whole against the first spring 41. The shielding box 4 will drive the driving block 7 to approach the bottom of the replacement groove 21. The driving block 7 is pressed and squeezes the transmission medium in the driving groove 49. The transmission medium is liquid. The transmission medium in the driving groove 49 will flow into the driven groove 40 along the liquid hole 491, thereby pushing the driven ring 8 in the driven groove 40 away from the bottom of the driven groove 40. The driven ring 8 will press against the end of the heating tube 3 to achieve a seal on the end of the heating tube 3. Furthermore, the end of the heating tube 3 is provided with an annular sealing groove 31. The driven ring 8 can be inserted into the sealing groove 31 to achieve a further seal on the heating tube 3. This prevents the medium in the heating tube 3 from leaking from the end of the heating tube 3, making it easier for the heating tube 3 to be moved out of the shielding box 4 for easy replacement.

[0039] Example 6: The condenser structure is the same as the heater structure, and heat sinks are installed on the outer wall of the condenser tube in the condenser.

[0040] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 4 The orientations or positional relationships shown are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance. In the description of the present invention, fixed connection refers to fixed connection.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A prefabricated segmented heat pipe heat exchanger for waste heat recovery from dust-laden flue gas, characterized in that: It includes a heater and a condenser; the heater is placed in a dusty, high-temperature process flue gas passage to absorb waste heat from the flue gas, causing the working medium inside the heater's heating tube to evaporate; the condenser is placed in a cooling medium passage to transfer heat to the cooling medium, causing the working medium inside the condenser's condensing tube to condense; the diameter of the heating tube is larger than the diameter of the condensing tube; the number of heating tubes is less than the number of condensing tubes; the heater and the condenser are connected by a circulation pipe.

2. The assembled segmented heat pipe heat exchanger for waste heat recovery of dust-laden flue gas according to claim 1, characterized in that: The heater includes conical shrouds at both ends and a central housing; the housing is fixedly connected to the conical shrouds at both ends; a drain connector is provided on the lower inner side of each conical shroud; a replacement slot is provided on the front side of the housing; an upper outlet hole corresponding to the upper end of the heating tube is provided on the top wall of the replacement slot; an upper connector communicating with the upper outlet hole is provided on the upper surface of the housing; a lower outlet hole corresponding to the lower end of the heating tube is provided on the bottom wall of the replacement slot; a lower connector communicating with the lower outlet hole is provided on the lower surface of the housing; multiple flue gas slots communicating with the replacement slot are provided through the left and right sides of the housing; the multiple flue gas slots are... The components are evenly distributed in the front-to-back direction and aligned with the heating tubes; the flue gas trough is connected to the cone hood; the bottom of the replacement trough is provided with an avoidance groove; the inner side of the replacement trough is slidably sealed to a shielding box with a front opening; the bottom of the avoidance groove and the shielding box are connected by a first spring; the top and bottom of the shielding box are respectively provided with an upper shielding hole and a lower shielding hole; the shielding box is provided with a side shielding groove running through it on the left and right sides; the shielding box is slidably connected to a vertical bar in the front and back; the rear side of the vertical bar is fixedly connected to a horizontal bar; the heating tube is connected to the horizontal bar; spare slots are provided on the left and right sides of the shielding box near the edge of the first spring.

3. A prefabricated segmented heat pipe heat exchanger for waste heat recovery of dust-laden flue gas according to claim 2, characterized in that: A notch is provided at the upper position of the front opening of the shielding box; the upper end of the vertical bar extends into the notch; an upper movable groove is provided at the upper end of the vertical bar facing downward; an upper locking bar is slidably connected in the upper movable groove; a toggle groove is provided at the lower end of the upper movable groove facing forward; a toggle block that is fixedly connected to the upper locking bar is slidably connected in the toggle groove; a second spring connects the lower end of the upper locking bar and the lower end of the upper movable groove; an upper locking groove for inserting the upper locking bar is provided on the upper inner wall of the replacement slot.

4. A prefabricated segmented heat pipe heat exchanger for waste heat recovery of dust-laden flue gas according to claim 2, characterized in that: The horizontal bar has pipe holes running vertically through it; multiple pipe holes are evenly distributed front and back; heating pipes are movably connected to the pipe holes vertically; a threaded stepped hole is provided on the right side of the pipe hole; a first bolt is connected to the internal thread of the stepped hole; flue gas passes through the box from left to right.

5. A prefabricated segmented heat pipe heat exchanger for waste heat recovery of dust-laden flue gas according to claim 3, characterized in that: The vertical bar has a lower movable groove facing upwards at its lower end; the lower movable groove is connected to the upper movable groove through a rotating groove; a lower locking bar with lower teeth is slidably connected in the lower movable groove; a gear is rotatably connected in the rotating groove; the gear simultaneously meshes the lower teeth on the lower locking bar and the upper teeth on the upper locking bar; the lower surface of the shielding box has a lower slot for the lower locking bar to be inserted.

6. A prefabricated segmented heat pipe heat exchanger for waste heat recovery of dust-laden flue gas according to claim 5, characterized in that: An auxiliary groove is provided on the inner wall of the lower slot; an auxiliary block is slidably connected in the auxiliary groove; the lower surface of the auxiliary block is connected to the bottom of the auxiliary groove by an auxiliary spring; a lower insertion block is slidably connected in the lower slot and fixedly connected to the auxiliary block; a lower card slot for inserting the lower insertion block is provided on the lower inner wall of the replacement slot.

7. A prefabricated segmented heat pipe heat exchanger for waste heat recovery of dust-laden flue gas according to claim 3, characterized in that: The rear surface of the shielding box is provided with a drive groove; a drive block is slidably and sealed within the drive groove; the drive block is connected to the bottom of the drive groove via a third spring; driven grooves corresponding to the heating tube are provided on the upper and lower sides of the inner side of the shielding box; the driven groove is annular; a driven ring is slidably and sealed within the driven groove; the driven groove and the bottom of the drive groove are connected via a liquid hole.

8. A prefabricated segmented heat pipe heat exchanger for waste heat recovery of dust-laden flue gas according to claim 7, characterized in that: The heating tube has annular sealing grooves at its upper and lower ends; the driven ring can be inserted into the sealing grooves.

9. A prefabricated segmented heat pipe heat exchanger for waste heat recovery of dust-laden flue gas according to claim 1, characterized in that: The condenser has the same structure as the heater, and heat sinks are installed on the outer wall of the condenser tubes in the condenser.

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