Cement kiln with waste heat recovery function and waste heat recovery method thereof

Abstract

The present application relates to energy-saving kiln technical field, disclose a kind of cement kiln with waste heat recovery function and its waste heat recovery method, including cyclone dust collector and waste heat boiler, cyclone dust collector gas end and waste heat boiler intake end are connected by gas pipe, the discharge port of cyclone dust collector bottom end is fixed with heat insulation pipe, heat insulation pipe is used to store dust, heat insulation pipe bottom end is equipped with unloader, and water inlet pipe is installed on waste heat boiler water inlet end.The present application can absorb the heat in coarse grain dust by setting heat insulation pipe at the bottom end of cyclone dust collector and passing the water inlet pipe of waste heat boiler through heat insulation pipe, realize the preheating of water inlet, and further improve the evaporation efficiency of water flow, improve energy utilization, with higher energy-saving effect, and by setting dust removal assembly inside waste heat boiler, by controlling the activity of hollow rod, the accumulated dust can be automatically removed online, improve the heat conduction efficiency of heat collecting pipe, so that the water flow heating efficiency is higher, further improve the energy-saving effect.

Description

Technical Field

[0001] This invention relates to the field of energy-saving kiln technology, specifically to a cement kiln with waste heat recovery function and a waste heat recovery method. Background Technology

[0002] Cement kilns are the core equipment in the cement production process. They are used to calcine raw materials such as limestone, clay, and iron ore at high temperatures to produce cement clinker, which is then ground into cement. It is the most energy-intensive and carbon-emitting stage in the cement industry, accounting for over 70% of the plant's total energy consumption. During production, cement kilns generate large amounts of high-temperature waste gas (200-400 degrees Celsius) and waste heat from clinker cooling (approximately 1000 degrees Celsius). This waste heat can be efficiently recovered and utilized through various methods, reducing both energy consumption and carbon emissions. Waste heat recovery in cement kilns primarily utilizes kiln head waste heat recovery equipment (AQC boiler) and kiln tail waste heat recovery equipment (SP boiler). Both generate medium- and low-pressure steam and superheated steam, which are used together to drive steam turbines for power generation.

[0003] Existing waste heat boilers at the kiln tail have certain problems in use: due to the large amount of dust in the exhaust gas discharged from the kiln tail, cyclone dust collectors are needed to remove large dust particles in order to reduce the wear of dust on the kiln tail boiler. However, the dust that is screened out still contains heat, which cannot be recovered. Secondly, dust easily adheres to the heat collection tubes inside the waste heat boiler, and the lack of online automatic cleaning measures can easily lead to a reduction in the thermal conductivity of the heat collection tubes, thereby reducing the heat recovery efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a cement kiln with waste heat recovery function and a waste heat recovery method, which has the advantage of improving waste heat recovery efficiency and solves the problems of current kiln tail waste heat boilers lacking measures to recover heat from dust and lacking online automatic cleaning measures for heat collection tubes.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a cement kiln with waste heat recovery function, comprising a cyclone dust collector and a waste heat boiler, wherein the outlet end of the cyclone dust collector and the inlet end of the waste heat boiler are connected by an air pipe, a heat insulation pipe is fixed at the discharge port at the bottom of the cyclone dust collector, the heat insulation pipe is used to store dust, a discharge device is installed at the bottom end of the heat insulation pipe, a water inlet pipe is installed at the water inlet end of the waste heat boiler, the water inlet pipe passes through the heat insulation pipe, a heat collection pipe and a dust removal assembly are installed inside the waste heat boiler, the dust removal assembly includes a hollow rod sleeved on the heat collection pipe and capable of vertical movement, the dust removal assembly is used to remove the accumulated dust on the heat collection pipe;

[0006] When the cyclone dust collector is in operation, it collects coarse dust particles in the exhaust gas and collects them in the heat insulation tube. When the waste heat boiler is in operation, it continuously supplies water to the inside of the waste heat filter through the water inlet pipe. When the water inlet pipe passes through the heat insulation tube, the heat of the coarse dust particles preheats the water. The dust removal components operate intermittently, forcing the hollow rod to move vertically along the heat collection tube, thereby scraping off the accumulated dust attached to the outer wall of the heat collection tube.

[0007] Preferably, a water pump is connected to the inlet end of the water inlet pipe, and the inlet end of the water pump is connected to an external water source. A hollow box for improving heat collection efficiency is installed in a section of the water inlet pipe inside the heat insulation pipe.

[0008] Preferably, the hollow box is a flat aluminum box, and the hollow box is provided with multiple sets of staggered strip-shaped baffles inside. The multiple sets of strip-shaped baffles divide the inner cavity of the hollow box into a tortuous water channel, and both ends of the water channel are connected to the water inlet pipe.

[0009] Preferably, the heat insulation tube is a vertically arranged square tube, and the heat insulation tube is connected to the discharge port at the bottom of the cyclone dust collector through a flange. The inner wall of the square tube is provided with two sets of symmetrically distributed vertical sliding grooves, which are located on both sides of the hollow box. Both sides of the hollow box are provided with dust removal components, and the dust removal components include scrapers that can rotate and move vertically.

[0010] Preferably, the ash removal assembly includes a vertical cylinder fixed above the flange, the output end of the vertical cylinder extending into the interior of the vertical slide groove and having a slider fixed thereon, the slider being slidably connected to the vertical slide groove, one end of the slider extending into the exterior of the vertical slide groove and having a notch, one end of the scraper being fixed to a base shaft, the base shaft being rotatably connected to the inner wall of the notch, a torsion spring being connected between the end of the base shaft and the slider, the length of the scraper being greater than the distance between the hollow box and the slider, the scraper including a handle and a blade head fixed to the bottom of the handle, and the base shaft being fixed to the top of the handle.

[0011] Preferably, a support rod is fixed to the top of the handle, and a horizontal electromagnetic push rod is fixedly embedded on the slider, with the output end of the electromagnetic push rod facing the support rod.

[0012] Preferably, the dust removal assembly further includes an upper rotating shaft and a lower rotating shaft. The upper rotating shaft is connected to the inner top wall of the waste heat boiler via an upper bearing seat, and the lower rotating shaft is connected to the inner bottom wall of the waste heat boiler via a lower bearing seat. An upper sprocket is fixed on the upper rotating shaft, and a lower sprocket is fixed on the lower rotating shaft. A chain is connected between the upper and lower sprockets, and the chain is fixedly connected to a hollow rod. A motor is also fixed inside the waste heat boiler, and the output end of the motor is fixedly connected to the end of the lower rotating shaft.

[0013] Preferably, a plurality of shovel rings are fixed at the bottom of the hollow rod, and the shovel rings are sleeved on the heat collection tube.

[0014] Preferably, a main branch pipe is fixed on the water inlet pipe, and a secondary branch pipe is fixed on the main branch pipe. One end of the secondary branch pipe extends into the interior of the waste heat boiler and is fixedly connected to the hollow rod. Multiple nozzles are fixed on the hollow rod, and the nozzles face the heat collection tube at the bottom of the hollow rod. A reagent barrel is also fixed on the outer wall of the waste heat boiler, and a discharge pipe is provided at the bottom of the reagent barrel and connected to the main branch pipe.

[0015] The present invention also discloses a waste heat recovery method, which uses the above-mentioned cement kiln with waste heat recovery function.

[0016] Compared with the prior art, the present invention provides a cement kiln with waste heat recovery function and a waste heat recovery method, which has the following beneficial effects:

[0017] 1. This type of cement kiln with waste heat recovery function and waste heat recovery method, by setting a heat insulation pipe at the bottom of the cyclone dust collector and passing the water inlet pipe of the waste heat boiler through the heat insulation pipe, can absorb the heat in coarse dust particles to preheat the water, thereby improving the subsequent evaporation efficiency of the water flow, improving energy utilization, and having a higher energy-saving effect. Furthermore, by setting a dust removal component inside the waste heat boiler, the accumulated ash can be automatically removed online by controlling the movement of the hollow rod, improving the thermal conductivity of the heat collection tube, making the water flow heating efficiency even higher, and further improving the energy-saving effect.

[0018] 2. This type of cement kiln with waste heat recovery function and waste heat recovery method, by setting up a hollow box, can increase the residence time of water flow inside the heat-insulating box, improve the heat absorption efficiency of water flow, and save more energy. By setting up a dust removal component, it is easier to control the movement of the scraper after it is in contact with the outer wall of the hollow box, thereby removing the dust accumulated on the outer wall of the hollow box, thereby improving the heat conduction efficiency of the hollow box and improving the heat utilization rate.

[0019] 3. This type of cement kiln with waste heat recovery function and waste heat recovery method, by setting up main branch pipes, secondary branch pipes, nozzles and reagent tanks, when the dust removal components cannot clean stubborn scale, uses water flow mixed with chemical cleaning agent to enter the secondary branch pipes and hollow rods, and sprays it onto the stubborn scale on the heat collection tubes through the nozzles to soften and corrode the scale. Then the dust removal components are restarted and the hollow rods are moved to scrape off the scale, thereby significantly improving the cleaning effect of scale. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a cement kiln with waste heat recovery function according to the present invention. Figure 1 ;

[0021] Figure 2 This is a three-dimensional structural diagram of a cement kiln with waste heat recovery function according to the present invention. Figure 2 ;

[0022] Figure 3 This is a cross-sectional view of the waste heat boiler of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the heat insulation pipe of the present invention;

[0024] Figure 5 This is an exploded view of the hollow box structure of the present invention;

[0025] Figure 6 This is a partial cross-sectional view of the scraper in operation according to the present invention;

[0026] Figure 7 For the present invention Figure 6 Enlarged view of part A;

[0027] Figure 8 This is a schematic diagram of the dust removal component of the present invention;

[0028] Figure 9 This is a schematic diagram of the installation structure of the secondary branch pipe of the present invention;

[0029] Figure 10 For the present invention Figure 9 Enlarged view of part B.

[0030] In the diagram: 1. Cyclone dust collector; 2. Waste heat boiler; 3. Gas pipe; 4. Insulation pipe; 5. Unloader; 6. Water inlet pipe; 7. Heat collector pipe; 8. Dust removal assembly; 81. Hollow rod; 82. Upper shaft; 83. Lower shaft; 84. Upper bearing housing; 85. Lower bearing housing; 86. Upper sprocket; 87. Lower sprocket; 88. Chain; 89. Motor; 810. Shovel ring; 9. Water pump; 10. Hollow box; 11. Strip block; 12. Water channel; 13. Flange; 14. Vertical chute; 15. Ash removal assembly; 151. Scraper; 152. Vertical cylinder; 153. Slider; 154. Torsion spring; 155. Support rod; 156. Electromagnetic push rod; 157. Base shaft; 16. Main branch pipe; 17. Secondary branch pipe; 18. Nozzle; 19. Reagent container; 20. Feed pipe. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a cement kiln with waste heat recovery function and a waste heat recovery method.

[0033] Example 1: Please refer to Figures 1-4 A cement kiln with waste heat recovery function includes a cyclone dust collector 1 and a waste heat boiler 2. The outlet of the cyclone dust collector 1 and the inlet of the waste heat boiler 2 are connected by an air pipe 3. The cyclone dust collector 1 has a discharge port at the bottom with a heat insulation pipe 4 for storing dust. A discharger 5 is installed at the bottom of the heat insulation pipe 4. A water inlet pipe 6 is installed on the water inlet of the waste heat boiler 2 and passes through the heat insulation pipe 4. A heat collection pipe 7 and a dust removal assembly 8 are installed inside the waste heat boiler 2. The dust removal assembly 8 includes a hollow rod 81 that is sleeved on the heat collection pipe 7 and can move vertically. The dust removal assembly 8 is used to remove the accumulated dust on the heat collection pipe 7.

[0034] When the cyclone dust collector 1 is in operation, it collects coarse dust particles in the exhaust gas and collects them in the heat insulation tube 4. When the waste heat boiler 2 is in operation, it continuously supplies water to the inside of the waste heat filter through the water inlet pipe 6. When the water inlet pipe 6 passes through the heat insulation tube 4, the heat of the coarse dust particles preheats the water. The dust removal component 8 operates intermittently, forcing the hollow rod 81 to move vertically along the heat collection tube 7, thereby scraping off the accumulated dust attached to the outer wall of the heat collection tube 7.

[0035] Among them, the heat insulation pipe 4 is insulated by external heat insulation material, and the hollow rod 81 is hollow inside. In the initial state, the hollow rod 81 is set at the top of the heat collection pipe 7. In actual application, the waste heat boiler 2 is equipped with multiple sets of heat collection pipes 7, and the number of hollow rods 81 matches the number of sets of heat collection pipes 7.

[0036] When in use, the cyclone dust collector 1 and the waste heat boiler 2 are started. The cyclone dust collector 1 removes coarse dust particles from the exhaust gas and then transports the exhaust gas to the waste heat boiler 2 through the gas pipe 3. Water is continuously transported to the waste heat boiler 2 through the water inlet pipe 6. The exhaust gas recovers heat when passing through the heat collection tube 7 inside the waste heat boiler 2. The water is heated when passing through the heat collection tube 7 and eventually forms steam and is discharged. The coarse dust particles collected by the cyclone dust collector 1 fall into the heat insulation tube 4 through the discharge port at the bottom. The heat of the coarse dust particles is conducted to the water in the water inlet pipe 6 to preheat the water and realize the utilization of the heat in the dust. When the preheating boiler is running, the dust removal component 8 operates intermittently, forcing the hollow rod 81 to move along the heat collection tube 7. When the hollow rod 81 moves, it scrapes off the ash attached to the outer wall of the heat collection tube 7, causing the ash to fall off and preventing the ash from affecting the heat conduction performance.

[0037] By installing a heat insulation tube 4 at the bottom of the cyclone dust collector 1 and passing the water inlet pipe 6 of the waste heat boiler 2 through the heat insulation tube 4, heat from coarse dust particles can be absorbed to preheat the incoming water, thereby improving the subsequent evaporation efficiency of the water flow, increasing energy utilization, and achieving higher energy-saving effect. Furthermore, by installing a dust removal component 8 inside the waste heat boiler 2 and controlling the movement of the hollow rod 81, the accumulated ash can be automatically removed online, improving the thermal conductivity of the heat collection tube 7, making the water flow heating efficiency even higher, and further improving the energy-saving effect.

[0038] Example 2: See Figures 2-6 Unlike the above embodiments, the inlet end of the water inlet pipe 6 is connected to a water pump 9, and the inlet end of the water pump 9 is connected to an external water source. A hollow box 10 for improving heat collection efficiency is installed in a section of the inlet pipe 6 inside the heat insulation pipe 4. The hollow box 10 is a flat aluminum box. Multiple sets of staggered strip-shaped baffles 11 are arranged inside the hollow box 10. The multiple sets of strip-shaped baffles 11 divide the inner cavity of the hollow box 10 into a tortuous water channel 12. Both ends of the water channel 12 are connected to the inlet pipe 6.

[0039] When the waste heat boiler 2 is running, the water pump 9 runs synchronously, pumping water into the inlet pipe 6. During use, the water flows from the inlet pipe 6 into the hollow box 10, flows along the water channel 12 inside the hollow box 10, and then flows out back into the inlet pipe 6. Because the hollow box 10 has high thermal conductivity, it absorbs heat from the coarse dust particles. When the water flows through the inside of the hollow box 10, it is also heated, thus achieving heat recovery. When the unloader 5 is started, it can control the low-temperature coarse dust particles in the insulation tube 4 to fall downwards, while the high-temperature coarse dust particles in the cyclone dust collector 1 fall into the insulation tube 4, so that the insulation tube 4 continues to maintain a high temperature.

[0040] By setting up a hollow box 10, the residence time of water flow inside the insulation box can be increased, thereby improving the heat absorption efficiency of the water flow and making it more energy-efficient.

[0041] Example 3, see Figures 5-10Unlike the above embodiments, the heat insulation pipe 4 is a vertically arranged square pipe. The heat insulation pipe 4 is connected to the discharge port at the bottom of the cyclone dust collector 1 through a flange 13. The inner wall of the square pipe is provided with two sets of symmetrically distributed vertical grooves 14. The two sets of grooves are located on both sides of the hollow box 10. A dust removal assembly 15 is provided on both sides of the hollow box 10. The dust removal assembly 15 includes a scraper 151 that can rotate and move vertically. The dust removal assembly 15 includes a vertical cylinder 152 fixed above the flange 13. The output end of the vertical cylinder 152 extends into the interior of the vertical groove 14 and is fixed with a slider 153. The slider 153 and the vertical groove 14 are connected. The sliding connection is as follows: one end of the slider 153 extends to the outside of the vertical groove 14 and is provided with a notch; one end of the scraper 151 is fixed with a base shaft 157, which is rotatably connected to the inner wall of the notch; a torsion spring 154 is connected between the end of the base shaft 157 and the slider 153; the length of the scraper 151 is greater than the distance between the hollow box 10 and the slider 153; the scraper 151 includes a handle and a blade head fixed at the bottom of the handle; the base shaft 157 is fixed at the top of the handle; a support rod 155 is also fixed at the top of the handle; a horizontal electromagnetic push rod 156 is fixedly embedded on the slider 153, and the output end of the electromagnetic push rod 156 faces the support rod 155.

[0042] The bottom of the vertical chute 14 is set as a slope. When the slider 153 moves down along the vertical chute 14, it pushes the accumulated dust inside the vertical chute 14, which helps to discharge the accumulated dust along the slope. The hollow box 10 is set at the center of the square tube. In the initial state, the electromagnetic push rod 156 is extended and abuts against the support rod 155, the torsion spring 154 is in a deformed state, and the slider 153 is located at the highest point of the vertical chute 14. In practical applications, coarse dust contains oxides of calcium, silicon, and aluminum, which are easily attached to the outside of the hollow box 10 inside the heat insulation tube 4, and will also affect the heat conduction efficiency. Therefore, after each use, the dust removal component 15 is activated to clean the air. The dust accumulated on both sides of the hollow box 10 is cleaned. In use, first start the electromagnetic push rod 156. After the electromagnetic push rod 156 retracts, under the elastic force of the torsion spring 154, it forces the base shaft 157 to rotate, which drives the scraper 151 to swing. After the scraper 151 swings, the blade head contacts the outer wall of the hollow box 10. Then start the vertical cylinder 152. The vertical cylinder 152 extends and pushes the slider 153 to move down. When the slider 153 moves, it drives the scraper 151 to move down. When the scraper 151 moves down, it cleans the dust accumulated on the outer wall of the hollow box 10. Then, control the vertical cylinder 152 and the electromagnetic push rod 156 to reset in sequence, and control the scraper 151 to re-adhere to the inner wall of the heat insulation tube 4.

[0043] By setting up the dust removal component 15, it is easier to control the movement of the scraper 151 after it adheres to the outer wall of the hollow box 10, thereby removing the accumulated dust on the outer wall of the hollow box 10, which improves the heat conduction efficiency of the hollow box 10, increases the heat utilization rate, and makes it more energy-efficient.

[0044] Example 4, see Figures 5-10 Unlike the above embodiments, the dust removal assembly 8 also includes an upper rotating shaft 82 and a lower rotating shaft 83. The upper rotating shaft 82 is connected to the inner top wall of the waste heat boiler 2 through an upper bearing seat 84, and the lower rotating shaft 83 is connected to the inner bottom wall of the waste heat boiler 2 through a lower bearing seat 85. An upper sprocket 86 is fixed on the upper rotating shaft 82, and a lower sprocket 87 is fixed on the lower rotating shaft 83. A chain 88 is connected between the upper sprocket 86 and the lower sprocket 87. The chain 88 is fixedly connected to the hollow rod 81. A motor 89 is also fixed inside the waste heat boiler 2. The output end of the motor 89 is fixedly connected to the end of the lower rotating shaft 83. A plurality of shovel rings 810 are fixed at the bottom of the hollow rod 81, and the shovel rings 810 are sleeved on the heat collection tube 7.

[0045] The upper sprocket 86, lower sprocket 87, and chain 88 are configured in multiple sets and matched with multiple sets of hollow rods 81 respectively. The shovel ring 810 is made of wear-resistant steel. In use, the motor 89 runs and drives the lower rotating shaft 83 to rotate. When the lower rotating shaft 83 rotates, it drives the lower sprocket 87 to rotate. When the lower sprocket 87 rotates, it drives the chain 88 to move, which in turn drives the upper sprocket 86 to rotate. When the chain 88 moves, it pulls the hollow rod 81 to move down. When the hollow rod 81 moves down, the shovel ring 810 moves down with it to remove the ash accumulated on the heat collection tube 7.

[0046] By setting up a dust removal component 8, a motor 89 can drive multiple hollow rods 81 to move downwards, thereby removing the accumulated dust on the surface of the heat collection tube 7, improving the heat conduction efficiency of the heat collection tube 7, and thus improving the waste heat recovery efficiency.

[0047] Example 5, see Figures 5-10 Unlike the above embodiments, a main branch pipe 16 is fixed on the water inlet pipe 6, and a secondary branch pipe 17 is fixed on the main branch pipe 16. One end of the secondary branch pipe 17 extends into the interior of the waste heat boiler 2 and is fixedly connected to the hollow rod 81. Multiple nozzles 18 are fixed on the hollow rod 81, and the nozzles 18 face the heat collection pipe 7 at the bottom of the hollow rod 81. A reagent barrel 19 is also fixed on the outer wall of the waste heat boiler 2. A discharge pipe 20 is provided at the bottom of the reagent barrel 19 and is connected to the main branch pipe 16.

[0048] Valves are installed on the water inlet pipe 6, the main branch pipe 16, and the discharge pipe 20. The reagent tank 19 is filled with chemical cleaning agent. In actual application, when there is stubborn scale on the heat collection tube 7 that cannot be removed by moving the hollow rod 81, the valves are controlled to open and close, so that the water in the water inlet pipe 6 flows into the branch pipe. At the same time, the chemical cleaning agent in the reagent tank 19 flows into the branch pipe. The water and chemical cleaning agent mix and enter the secondary branch pipe 17 and the hollow rod 81. The mixture is then sprayed through the nozzle 18 onto the stubborn scale on the heat collection tube 7 to soften and corrode the scale. Then, the dust removal component 8 is activated again, and the hollow rod 81 is moved to scrape off the scale, thereby significantly improving the cleaning effect of the scale.

[0049] Example 6: A waste heat recovery method using a cement kiln with waste heat recovery function from the above examples.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cement kiln with waste heat recovery function, comprising a cyclone dust collector (1) and a waste heat boiler (2), wherein the outlet end of the cyclone dust collector (1) and the inlet end of the waste heat boiler (2) are connected by an air pipe (3), characterized in that: The discharge port at the bottom of the cyclone dust collector (1) is fixed with a heat insulation pipe (4), which is used to store dust. A discharger (5) is installed at the bottom of the heat insulation pipe (4). A water inlet pipe (6) is installed on the water inlet end of the waste heat boiler (2). The water inlet pipe (6) passes through the heat insulation pipe (4). A heat collection pipe (7) and a dust removal assembly (8) are installed inside the waste heat boiler (2). The dust removal assembly (8) includes a hollow rod (81) that is sleeved on the heat collection pipe (7) and can move vertically. The dust removal assembly (8) is used to remove the accumulated dust on the heat collection pipe (7). The dust removal assembly (8) also includes an upper rotating shaft (82) and a lower rotating shaft (83). The upper rotating shaft (82) is connected to the inner top wall of the waste heat boiler (2) through an upper bearing seat (84), and the lower rotating shaft (83) is connected to the inner bottom wall of the waste heat boiler (2) through a lower bearing seat (85). An upper sprocket (86) is fixed on the upper rotating shaft (82), and a lower sprocket (87) is fixed on the lower rotating shaft (83). A chain (88) is connected between the upper sprocket (86) and the lower sprocket (87). The chain (88) is fixedly connected to a hollow rod (81). A motor (89) is also fixed inside the waste heat boiler (2). The output end of the motor (89) is fixedly connected to the end of the lower rotating shaft (83). The hollow rod (81) has multiple shovel rings (810) fixed at its bottom, and the shovel rings (810) are sleeved on the heat collection tube (7); A main branch pipe (16) is fixed on the water inlet pipe (6), and a secondary branch pipe (17) is fixed on the main branch pipe (16). One end of the secondary branch pipe (17) extends into the interior of the waste heat boiler (2) and is fixedly connected to the hollow rod (81). Multiple nozzles (18) are fixed on the hollow rod (81). The nozzles (18) face the heat collection pipe (7) at the bottom of the hollow rod (81). A reagent barrel (19) is also fixed on the outer wall of the waste heat boiler (2). A discharge pipe (20) is provided at the bottom of the reagent barrel (19) and is connected to the main branch pipe (16). When the cyclone dust collector (1) is running, it collects coarse dust particles in the exhaust gas and collects them in the heat insulation tube (4). When the waste heat boiler (2) is running, it continuously supplies water to the interior of the waste heat boiler (2) through the water inlet pipe (6). When the water inlet pipe (6) passes through the heat insulation tube (4), the heat of the coarse dust particles preheats the water. The dust removal component (8) operates intermittently, forcing the hollow rod (81) to move vertically along the heat collection tube (7), thereby scraping off the accumulated dust attached to the outer wall of the heat collection tube (7).

2. A cement kiln with waste heat recovery function according to claim 1, characterized in that: The water inlet pipe (6) is connected to a water pump (9) at its inlet end. The water pump (9) is connected to an external water source at its inlet end. A hollow box (10) for improving heat collection efficiency is installed in a section of the water inlet pipe (6) inside the heat insulation pipe (4).

3. A cement kiln with waste heat recovery function according to claim 2, characterized in that: The hollow box (10) is a flat aluminum box. The hollow box (10) has multiple sets of staggered strip blocks (11) inside. The multiple sets of strip blocks (11) divide the inner cavity of the hollow box (10) into a tortuous waterway (12). Both ends of the waterway (12) are connected to the water inlet pipe (6).

4. A cement kiln with waste heat recovery function according to claim 1, characterized in that: The heat insulation pipe (4) is a vertically arranged square pipe. The heat insulation pipe (4) is connected to the discharge port at the bottom of the cyclone dust collector (1) through a flange (13). The inner wall of the square pipe is provided with two sets of symmetrically distributed vertical sliding grooves (14). The two sets of vertical sliding grooves (14) are located on both sides of the hollow box (10). The hollow box (10) is provided with dust removal components (15) on both sides. The dust removal components (15) include a scraper (151) that can rotate and move vertically.

5. A cement kiln with waste heat recovery function according to claim 4, characterized in that: The dust removal assembly (15) includes a vertical cylinder (152) fixed above the flange (13). The output end of the vertical cylinder (152) extends into the interior of the vertical slide groove (14) and is fixed with a slider (153). The slider (153) is slidably connected to the vertical slide groove (14). One end of the slider (153) extends to the outside of the vertical slide groove (14) and is provided with a notch. One end of the scraper (151) is fixed with a base shaft (157). The base shaft (157) is rotatably connected to the inner wall of the notch. A torsion spring (154) is connected between the end of the base shaft (157) and the slider (153). The length of the scraper (151) is greater than the distance between the hollow box (10) and the slider (153). The scraper (151) includes a handle and a blade head fixed at the bottom of the handle. The base shaft (157) is fixed at the top of the handle.

6. A cement kiln with waste heat recovery function according to claim 5, characterized in that: The top of the handle is also fixed with a support rod (155), and a horizontal electromagnetic push rod (156) is fixedly embedded on the slider (153), with the output end of the electromagnetic push rod (156) facing the support rod (155).

7. A waste heat recovery method, characterized in that: This waste heat recovery method uses a cement kiln with waste heat recovery function as described in any one of claims 1-6.

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