Industrial kiln waste heat recovery device

Abstract

This invention discloses an industrial kiln waste heat recovery device, belonging to the field of waste heat recovery technology. It includes an industrial kiln and a waste heat recovery box, with a first heat-conducting pipe connecting the kiln and the box. A controller is installed at the top of the waste heat recovery box. Heat exchange can be performed between an aqueous solution and waste gas, and the heated aqueous solution can be exported to the equipment to be heated, maximizing the recovery and utilization of heat from the waste gas and reducing the temperature of the waste gas emitted into the environment, effectively reducing environmental pollution. Simultaneously, the auxiliary heat-absorbing element accelerates the heating of the aqueous solution and continues to absorb heat from the waste gas during the replacement of the aqueous solution. By introducing a second heat-conducting pipe into the industrial kiln, the thermal efficiency of the kiln is improved, saving fuel energy. The purification chamber removes harmful gases contained in the waste gas.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, and more specifically, to a waste heat recovery device for industrial kilns. Background Technology

[0002] A kiln is a piece of equipment made of refractory materials used to fire ceramic products; it is an essential facility in the shaping of pottery. Human beings have accumulated a wealth of kiln styles and experience over tens of thousands of years of ceramic firing history. From open-air firing and pit firing in primitive societies to dome-shaped rising-flame round kilns, semi-downdraft horseshoe-shaped kilns, semi-slope dragon kilns, and duck-egg-shaped kilns, and then to modern indoor gas kilns and electric kilns, kiln technology has been continuously improved and developed.

[0003] Waste heat refers to the sensible and latent heat that has not been rationally utilized in the original design of industrial energy-consuming equipment that has been put into operation due to limitations in history, technology, and concepts. It includes waste heat from high-temperature exhaust gas, waste heat from cooling media, waste steam and wastewater, waste heat from high-temperature products and slag, waste heat from chemical reactions, and waste heat from combustible exhaust gas, waste liquid, and waste materials.

[0004] The internal heating temperature of kilns is generally over 1,000 degrees Celsius, and the exhaust gas contains a high amount of residual heat. This waste gas is typically released directly into the air, resulting in a significant waste of resources and increased production costs. Furthermore, kiln exhaust often contains large amounts of soot and dust; directly releasing this waste gas into the air can easily pollute the environment. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention aims to provide an industrial kiln waste heat recovery device. This device can exchange heat between an aqueous solution and waste gas, and then export the heated aqueous solution to the equipment to be heated, maximizing the recovery and utilization of heat from the waste gas and reducing the temperature of the waste gas emitted into the environment, effectively reducing environmental pollution. Simultaneously, the auxiliary heat-absorbing element accelerates the heating of the aqueous solution and continues to absorb heat from the waste gas during the replacement of the aqueous solution. By introducing a second heat-conducting pipe into the industrial kiln, the thermal efficiency of the kiln is improved, saving fuel energy. Furthermore, the inclusion of a purification chamber removes harmful gases contained in the waste gas.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] An industrial kiln waste heat recovery device includes an industrial kiln and a waste heat recovery box. A first heat-conducting pipe connects the industrial kiln and the waste heat recovery box. A controller is installed at the upper end of the waste heat recovery box. An inlet pipe with a first electric valve is connected to the upper surface of the waste heat recovery box. The bottom end of the inlet pipe penetrates the upper surface of the waste heat recovery box and extends into the waste heat recovery box. The inlet pipe is located on the side of the controller. An outlet pipe with a second electric valve is connected to the lower part of the side surface of the waste heat recovery box. The outlet pipe penetrates the right surface of the waste heat recovery box. A baffle plate is fixedly connected between the inner walls of the upper surface and the right surface of the waste heat recovery box. A purification chamber is formed between the baffle plate, the upper surface, and the right surface. A flow hole is drilled at the side end of the baffle plate. A second heat-conducting pipe is connected to the upper part of the side surface of the waste heat recovery box. The second heat-conducting pipe is located above the outlet pipe and is connected to the purification chamber. An aqueous solution is injected into the waste heat recovery box. Multiple evenly distributed auxiliary heat-absorbing elements are fixedly connected to the inner wall of the waste heat recovery box. Heat exchange can be achieved between the aqueous solution and the waste gas. The heated aqueous solution can then be exported to the equipment to be heated, maximizing the recovery and utilization of heat from the waste gas and reducing the temperature of the waste gas emitted into the environment, thus effectively reducing environmental pollution. At the same time, the auxiliary heat absorption component can accelerate the heating of the aqueous solution and continue to absorb heat from the waste gas during the replacement of the aqueous solution. By introducing a second heat pipe into the industrial kiln, the thermal efficiency of the kiln is improved, saving fuel energy. The purification chamber removes harmful gases contained in the waste gas.

[0008] Furthermore, the auxiliary heat absorber is a heat absorber block connected to the inner wall of the waste heat recovery tank. The inside of the heat absorber block is a receiving cavity filled with heat-conducting oil. When the temperature of the aqueous solution in the waste heat recovery tank reaches a certain value, the aqueous solution is discharged through the outlet pipe to the place where it needs to be heated. During the process of replenishing the water after the aqueous solution is discharged, the auxiliary heat absorber absorbs some of the heat in the waste gas. The temperature of the heat-conducting oil rises after being heated. When the new water is injected into the waste heat recovery tank, the temperature rise of the new water is accelerated under the action of the heat of the subsequent waste gas and the heat-conducting oil, thereby making the heat recovery efficiency higher. The outer end of the heat absorber block is drilled with multiple evenly distributed water guide holes. When the aqueous solution is discharged through the outlet pipe, the water guide holes make it difficult for the aqueous solution to be blocked by the heat absorber block and not be able to flow out completely. The heat absorber block has a hollow frustum structure and is made of heat-conducting material, so that when the waste gas comes into contact with the heat absorber block, its heat can be transferred to the heat-conducting oil in a better way. At the same time, the heat of the heat-conducting oil when its temperature rises can be transferred to the aqueous solution.

[0009] Furthermore, the waste heat recovery box is equipped with a heat transfer structure, which includes a connecting pipe, an annular heat transfer pipe connected to the first heat conduction pipe through the connecting pipe, a main heat transfer pipe fixed and distributed on the annular heat transfer pipe, and at least one auxiliary heat transfer pipe fixed on the main heat transfer pipe. The annular heat transfer pipe is connected to the connecting pipe, the main heat transfer pipe is connected to the annular heat transfer pipe, and the auxiliary heat transfer pipe is connected to the main heat transfer pipe. The main heat transfer pipe faces the heat absorption block, and the auxiliary heat transfer pipe is U-shaped or V-shaped. The opening end of the main heat transfer pipe, away from the annular heat transfer pipe, faces the heat absorber block. The lower opening end of the auxiliary heat transfer pipe is inclined upward relative to the main heat transfer pipe, and the lower opening end of the auxiliary heat transfer pipe is inclined downward relative to the main heat transfer pipe. The special shape of the auxiliary heat transfer pipe can accelerate the transport speed of the hot waste gas entering the main heat transfer pipe. The heat transfer structure can guide the hot waste gas coming out of the first heat conduction pipe into the waste heat recovery box more quickly, so that the hot waste gas reacts with the auxiliary heat absorber first, causing the auxiliary heat absorber to heat up. Specifically, the hot waste gas is sent into the main heat transfer pipe through the connecting pipe and the annular heat transfer pipe. The hot waste gas entering the main heat transfer pipe is accelerated in output speed under the action of the auxiliary heat transfer pipe, and then reacts with the aqueous solution. Under the guidance of the auxiliary heat absorber, the hot waste gas gradually moves towards the center of the aqueous solution.

[0010] Furthermore, at least one heat-conducting part is fixed between each pair of adjacent heat-absorbing blocks, so that when the heat transfer structure quickly transfers heat to the auxiliary heat-absorbing element located on the lower side, the other auxiliary heat-absorbing elements located on the upper side can absorb the heat from the auxiliary heat-absorbing element on the lower side and heat up rapidly due to the setting of the heat-conducting part.

[0011] Furthermore, a motor is fixedly connected to the bottom of the waste heat recovery box. The motor is electrically connected to the controller. The output end of the motor passes through and extends into the waste heat recovery box. The output end of the motor is connected to a spiral blade, which is located inside the heat absorption block. During use, the motor is started, and the motor drives the spiral blade to rotate, thereby accelerating the flow of the aqueous solution in the waste heat recovery box and making the heat exchange efficiency between the aqueous solution and the waste gas higher.

[0012] Furthermore, the purification chamber includes multiple activated carbon adsorption layers. The upper and lower ends of the activated carbon adsorption layers are respectively connected to the waste heat recovery box and the baffle plate. The activated carbon adsorption layers adsorb harmful gases contained in the exhaust gas entering the purification chamber, so that the exhaust gas is relatively clean.

[0013] Furthermore, a temperature sensor is fixedly connected to the left inner wall of the waste heat recovery box. The temperature sensor is located between two heat absorption blocks and is electrically connected to the controller. The critical temperature of the temperature sensor is preset and stored in the controller. When the temperature of the aqueous solution reaches the critical temperature, the temperature sensor transmits the sensed temperature signal to the controller, and the controller controls the second electric valve to open, so that the aqueous solution is discharged through the outlet pipe.

[0014] Furthermore, a liquid level sensor is fixedly connected to the outer end of the waste heat recovery tank. The liquid level sensor is electrically connected to the controller. The liquid level sensor and the bottom of the waste heat recovery tank are on the same horizontal plane. When the aqueous solution that has reached the critical temperature is discharged through the outlet pipe, when the aqueous solution is completely discharged and the liquid level sensor does not detect the water level, it transmits a signal to the controller. The controller controls the first electric valve to open and inject new water into the waste heat recovery tank through the inlet pipe.

[0015] Furthermore, the horizontal liquid level of the aqueous solution is always lower than the horizontal level at the bottom of the flow hole, so that the liquid level of the aqueous solution is not too high and flows into the purification chamber from the flow hole and out of the purification chamber. A filter screen is fixedly connected between the upper and lower inner walls of the flow hole to intercept particulate impurities contained in the exhaust gas.

[0016] Furthermore, an insulation layer is fixedly connected to the outer end of the first heat pipe, so that when the heat in the hot waste gas in the industrial kiln is introduced into the waste heat recovery box through the first heat pipe, the heat is not easily dissipated to the external environment due to the insulation layer.

[0017] Compared with the prior art, the advantages of this invention are:

[0018] (1) This solution can exchange heat between the aqueous solution and the waste gas, and export the heated aqueous solution to the equipment to be heated for use, thereby maximizing the recovery and utilization of heat in the waste gas and reducing the temperature of the waste gas discharged into the environment, effectively reducing environmental pollution. At the same time, the setting of the auxiliary heat absorption component can accelerate the heating of the aqueous solution and continue to adsorb the heat of the waste gas during the replacement of the aqueous solution. By introducing the second heat conduction pipe into the industrial kiln, the thermal efficiency of the kiln is improved and fuel energy consumption is saved. The setting of the purification chamber removes the harmful gases contained in the waste gas.

[0019] (2) The auxiliary heat absorber includes a heat absorber block connected to the inner wall of the waste heat recovery box. The heat absorber block has a cavity inside, which is filled with heat transfer oil. When the temperature of the aqueous solution in the waste heat recovery box reaches a certain value, the aqueous solution is discharged through the outlet pipe to the place where it needs to be heated. During the process of replenishing the water after the aqueous solution is discharged, the auxiliary heat absorber absorbs part of the heat in the waste gas. The temperature of the heat transfer oil rises after being heated. When the new water is injected into the waste heat recovery box, the temperature rise of the new water is accelerated under the action of the heat of the subsequent waste gas and the heat transfer oil, thereby making the heat recovery efficiency higher. The outer end of the heat absorber block has multiple evenly distributed water guide holes. When the aqueous solution is discharged through the outlet pipe, the water guide holes make it difficult for the aqueous solution to be blocked by the heat absorber block and not be able to flow out completely. The heat absorber block is a hollow frustum structure and is made of heat-conducting material, so that when the waste gas comes into contact with the heat absorber block, its heat can be transferred to the heat transfer oil in a better way. At the same time, the heat of the heat transfer oil when its temperature rises can be transferred to the aqueous solution.

[0020] (3) The waste heat recovery box is equipped with a heat transfer structure, which includes a connecting pipe threaded into the first heat-conducting pipe, an annular heat transfer pipe fixed at one end of the connecting pipe away from the first heat-conducting pipe, multiple uniformly distributed main heat transfer pipes fixed at the upper part of the annular heat transfer pipe, and at least one auxiliary heat transfer pipe fixed on the outer wall of the main heat transfer pipe. The annular heat transfer pipe is connected to the connecting pipe, the main heat transfer pipe is connected to the annular heat transfer pipe, and the auxiliary heat transfer pipe is connected to the main heat transfer pipe. The open end of the main heat transfer pipe away from the annular heat transfer pipe faces the heat absorption block, and the lower open end of the auxiliary heat transfer pipe is inclined upward relative to the main heat transfer pipe. The auxiliary heat transfer tube is inclined downward relative to the main heat transfer tube. The special shape of the auxiliary heat transfer tube can accelerate the delivery speed of the hot waste gas entering the main heat transfer tube. The heat transfer structure can guide the hot waste gas coming out of the first heat transfer tube into the waste heat recovery box more quickly, so that the hot waste gas reacts with the auxiliary heat absorber first, causing the auxiliary heat absorber to heat up. Specifically, the hot waste gas is sent into the main heat transfer tube through the connecting pipe and the annular heat transfer tube. The hot waste gas entering the main heat transfer tube is accelerated in output speed under the action of the auxiliary heat transfer tube, and then reacts with the aqueous solution. Under the guidance of the auxiliary heat absorber, the hot waste gas gradually moves towards the center of the aqueous solution.

[0021] (4) At least one heat-conducting part is fixed between each pair of adjacent heat-absorbing blocks, so that when the heat transfer structure quickly transfers heat to the auxiliary heat-absorbing element located on the lower side, the other auxiliary heat-absorbing elements located on the upper side can absorb the heat of the auxiliary heat-absorbing element on the lower side and heat up rapidly through the setting of the heat-conducting part.

[0022] (5) A motor is fixedly connected to the bottom of the waste heat recovery box. The motor is electrically connected to the controller. The output end of the motor passes through and extends into the waste heat recovery box. The output end of the motor is connected to a spiral blade. The spiral blade is located inside the heat absorption block. During use, the motor is started and the motor drives the spiral blade to rotate, thereby accelerating the flow of the aqueous solution in the waste heat recovery box and making the heat exchange efficiency between the aqueous solution and the waste gas higher.

[0023] (6) The purification chamber includes multiple activated carbon adsorption layers. The upper and lower ends of the activated carbon adsorption layers are respectively connected to the waste heat recovery box and the baffle plate. The activated carbon adsorption layers adsorb the harmful gases contained in the waste gas entering the purification chamber, so that the discharged waste gas is relatively clean.

[0024] (7) A temperature sensor is fixedly connected to the left inner wall of the waste heat recovery box. The temperature sensor is electrically connected to the controller between the temperature sensor and two heat absorption blocks. The critical temperature of the temperature sensor is preset and stored in the controller. When the temperature of the aqueous solution reaches the critical temperature, the temperature sensor transmits the sensed temperature signal to the controller. The controller controls the second electric valve to open, so that the aqueous solution is discharged through the outlet pipe.

[0025] (8) A liquid level sensor is fixedly connected to the outer end of the waste heat recovery box. The liquid level sensor is electrically connected to the controller. The liquid level sensor and the bottom of the waste heat recovery box are on the same horizontal plane. When the aqueous solution that has reached the critical temperature is discharged through the outlet pipe, when the aqueous solution is completely discharged, if the liquid level sensor does not detect the water level, it will transmit the signal to the controller. The controller will control the first electric valve to open and inject new water into the waste heat recovery box through the inlet pipe.

[0026] (9) The horizontal liquid level of the aqueous solution is always lower than the horizontal level at the bottom of the flow hole, so that the liquid level of the aqueous solution is not too high and flows into the purification chamber through the flow hole and out of the purification chamber. A filter screen is fixedly connected between the upper and lower inner walls of the flow hole to intercept particulate impurities contained in the exhaust gas.

[0027] (10) The outer end of the first heat pipe is fixedly connected with a heat insulation layer so that when the heat in the hot waste gas in the industrial kiln is introduced into the waste heat recovery box through the first heat pipe, the heat is not easily dissipated to the external environment due to the setting of the heat insulation layer. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the front structure of the present invention;

[0029] Figure 2 This is a cross-sectional structural diagram of the waste heat recovery box section of the present invention;

[0030] Figure 3 for Figure 2 Schematic diagram of the structure at point A;

[0031] Figure 4 This is a three-dimensional structural diagram of the heat transfer structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the cleanroom portion of the present invention;

[0033] Figure 6 This is a three-dimensional structural diagram of the heat-absorbing block portion of the present invention;

[0034] Figure 7 This is a partial block diagram of the present invention.

[0035] Explanation of the labels in the diagram:

[0036] 11 First heat conduction pipe, 12 Insulation layer, 21 Waste heat recovery box, 22 Liquid inlet pipe, 23 Second heat conduction pipe, 241 Baffle plate, 242 Flow hole, 243 Filter screen, 25 Liquid outlet pipe, 26 Motor, 27 Spiral blade, 31 Heat absorption block, 32 Heat transfer oil, 33 Receiving cavity, 34 Water guide hole, 4 Temperature sensor, 5 Liquid level sensor, 6 Heat conduction part, 7 Heat transfer structure, 71 Connecting pipe, 72 Annular heat transfer pipe, 73 Auxiliary heat transfer pipe, 74 Main heat transfer pipe, 8 Industrial kiln, 9 Controller, 10 Purification room, 13 Aqueous solution, 14 Activated carbon adsorption layer. Detailed Implementation

[0037] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not 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 limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Example 1:

[0041] Please see Figure 1-7 An industrial kiln waste heat recovery device includes an industrial kiln 8 and a waste heat recovery box 21. A first heat conduction pipe 11 connects the industrial kiln 8 and the waste heat recovery box 21. A heat insulation layer 12 is fixedly connected to the outer end of the first heat conduction pipe 11. When the heat in the hot waste gas in the industrial kiln 8 is introduced into the waste heat recovery box 21 through the first heat conduction pipe 11, the heat is not easily dissipated to the external environment due to the setting of the heat insulation layer 12. In specific implementation, a primary filter structure can be installed at a suitable position in the first heat conduction pipe 11 so that the waste gas is pre-filtered before entering the waste heat recovery box 21. Combined with the purification chamber filtration, the harmful gases in the waste gas can be removed more effectively.

[0042] A controller 9 is installed at the top of the waste heat recovery box 21. An inlet pipe 22 with a first electric valve is connected to the top of the waste heat recovery box 21. The inlet pipe 22 is connected to an external water tank. The first electric valve is electrically connected to the controller 9. The bottom end of the inlet pipe 22 passes through the top of the waste heat recovery box 21 and extends into the box. The specific positions of the inlet pipe 22 and the controller 9 on the upper surface of the waste heat recovery box 21 depend on the installation configuration. Figure 1The liquid inlet pipe 22 is located on the left side of the controller 9. The right end of the waste heat recovery box 21 is connected to the liquid outlet pipe 25 with a second electric valve. The liquid outlet pipe 25 is connected to the external equipment to be heated. The second electric valve is electrically connected to the controller 9. The liquid outlet pipe 25 passes through the right inner wall of the waste heat recovery box 21. A baffle plate 241 is fixedly connected between the top of the waste heat recovery box 21 and the right inner wall. A purification chamber 10 is formed between the baffle plate 241 and the right inner wall of the waste heat recovery box 21. A flow hole 242 is drilled at the left end of the baffle plate 241. The right end of the waste heat recovery box 21 is connected to the second heat conduction pipe 23. The second heat pipe 23 is located above the liquid outlet pipe 25 and is connected to the purification chamber 10. The second heat pipe 23 can be connected to the industrial kiln 8 to improve the heating efficiency of the industrial kiln 8 and reduce energy consumption. The waste heat recovery box 21 is filled with an aqueous solution 13. The horizontal liquid level of the aqueous solution 13 is always lower than the horizontal level of the bottom of the flow hole 242, so that the liquid level of the aqueous solution 13 is not too high and flows into the purification chamber 10 from the flow hole 242 and flows out of the purification chamber 10. Multiple evenly distributed auxiliary heat absorption components are fixedly connected to the inner wall of the waste heat recovery box 21.

[0043] Please see Figure 3 The auxiliary heat absorber includes a heat absorber block 31, which is connected to the inner wall of the waste heat recovery box 21. The heat absorber block 31 has a cavity 33 inside, which is filled with heat transfer oil 32. When the temperature of the aqueous solution 13 in the waste heat recovery box 21 reaches a certain value, the aqueous solution 13 is discharged through the outlet pipe 25 to the place where it needs to be heated. During the process of replenishing the water after the aqueous solution 13 is discharged, the auxiliary heat absorber absorbs part of the heat in the waste gas. The temperature of the heat transfer oil 32 rises after being heated. When the new water is injected into the waste heat recovery box 21, the temperature of the new water rises faster under the heat of the subsequent waste gas and the action of the heat transfer oil 32, thereby making the heat recovery efficiency higher.

[0044] The waste heat recovery box 21 is equipped with a heat transfer structure 7, which includes a connecting pipe 71 threaded into the first heat-conducting pipe 11, an annular heat transfer pipe 72 fixed at one end of the connecting pipe 71 away from the first heat-conducting pipe 11, multiple evenly distributed main heat transfer pipes 74 fixed at the upper part of the annular heat transfer pipe 72, and at least one auxiliary heat transfer pipe 73 fixed to the outer wall of the main heat transfer pipe 74. The annular heat transfer pipe 72 is connected to the connecting pipe 71, the main heat transfer pipe 74 is connected to the annular heat transfer pipe 72, and the auxiliary heat transfer pipe 73 is connected to the main heat transfer pipe 74. The open end of the main heat transfer pipe 74 away from the annular heat transfer pipe 72 faces the heat absorption block 31, and the lower open end of the auxiliary heat transfer pipe 73 is inclined upward relative to the main heat transfer pipe 74. The lower opening end of the heat transfer tube 73 is inclined downward relative to the main heat transfer tube 74. The special shape of the auxiliary heat transfer tube 73 can accelerate the delivery speed of the hot waste gas entering the main heat transfer tube 74. The heat transfer structure 7 can guide the hot waste gas coming out of the first heat conduction tube 11 into the waste heat recovery box 21 more quickly, so that the hot waste gas reacts with the auxiliary heat absorber first to raise the temperature of the auxiliary heat absorber. Specifically, the hot waste gas is sent into the main heat transfer tube 74 through the connecting pipe 71 and the annular heat transfer tube 72. The hot waste gas entering the main heat transfer tube 74 is accelerated in output speed under the action of the auxiliary heat transfer tube 73, and then reacts with the aqueous solution 13. Under the guidance of the auxiliary heat absorber, the hot waste gas gradually moves towards the center of the aqueous solution 13.

[0045] At least one heat-conducting part 6 is fixed between each pair of adjacent heat-absorbing blocks 31, so that when the heat transfer structure 7 quickly transfers heat to the auxiliary heat-absorbing component located on the lower side, the other auxiliary heat-absorbing components located on the upper side can absorb the heat of the auxiliary heat-absorbing component on the lower side and heat up rapidly through the setting of the heat-conducting part 6.

[0046] Please see Figure 2 A motor 26 is fixedly connected to the bottom of the waste heat recovery box 21. The motor 26 is electrically connected to the controller 9. The output end of the motor 26 extends through and into the waste heat recovery box 21. The output end of the motor 26 is connected to a spiral blade 27, which is located inside the heat absorption block 31. During use, the motor 26 is started, and the motor 26 drives the spiral blade 27 to rotate, thereby accelerating the flow of the aqueous solution 13 in the waste heat recovery box 21 and making the heat exchange efficiency between the aqueous solution 13 and the waste gas higher.

[0047] Please see Figure 4 A filter screen 243 is fixedly connected between the upper and lower inner walls of the flow hole 242 to intercept particulate impurities contained in the exhaust gas. The purification chamber 10 includes multiple activated carbon adsorption layers 14. The upper and lower ends of the activated carbon adsorption layer 14 are respectively connected to the waste heat recovery box 21 and the baffle plate 241. The activated carbon adsorption layer 14 adsorbs the harmful gases contained in the exhaust gas entering the purification chamber 10, so that the exhaust gas is relatively clean.

[0048] Please see Figure 5 The heat absorber block 31 has a hollow frustum structure and is made of thermally conductive material. When the exhaust gas comes into contact with the heat absorber block 31, its heat can be transferred to the heat transfer oil 32 in a better way. At the same time, the heat from the heat transfer oil 32 when its temperature rises can be transferred to the aqueous solution 13. The outer end of the heat absorber block 31 has multiple evenly distributed water guide holes 34. When the aqueous solution 13 is discharged through the liquid outlet pipe 25, the water guide holes 34 make it less likely that the aqueous solution 13 will be blocked by the heat absorber block 31 and cannot flow out completely.

[0049] Please see Figure 2 and Figure 6 A temperature sensor 4 is fixedly connected to the left inner wall of the waste heat recovery box 21. The temperature sensor 4 is located between two heat absorption blocks 31. The temperature sensor 4 is electrically connected to the controller 9. The critical temperature of the temperature sensor 4 is preset and stored in the controller 9. When the temperature of the aqueous solution 13 reaches the critical temperature, the temperature sensor 4 transmits the sensed temperature signal to the controller 9. The controller 9 controls the second electric valve to open, so that the aqueous solution 13 is discharged through the outlet pipe 25.

[0050] Please see Figure 1 and Figure 6 A liquid level sensor 5 is fixedly connected to the outer end of the waste heat recovery tank 21. The liquid level sensor 5 is electrically connected to the controller 9. The liquid level sensor 5 and the bottom of the waste heat recovery tank 21 are on the same horizontal plane. When the aqueous solution 13 that has reached the critical temperature is discharged through the outlet pipe 25, when the aqueous solution 13 is completely discharged, if the liquid level sensor 5 does not detect the water level, it will transmit a signal to the controller 9. The controller 9 controls the first electric valve to open and inject new water into the waste heat recovery tank 21 through the inlet pipe 22.

[0051] During operation, the hot exhaust gas generated in the industrial kiln 8 enters the waste heat recovery box 21 through the first heat pipe 11 and the heat transfer structure 7. The hot exhaust gas first contacts the heat absorber block 31, transferring heat waves to the heat transfer oil 32. The temperature of the heat transfer oil 32 gradually increases, which helps to raise the temperature of the aqueous solution 13. The heat absorber block 31 also guides the hot exhaust gas, causing it to move closer to the center of the aqueous solution 13 before contacting it and transferring heat to the aqueous solution 13. During this process, the motor 26 can be started, causing the motor 26 to drive the spiral blades 27 to rotate, accelerating the flow of the aqueous solution 13 in the waste heat recovery box 21 and making the heat exchange efficiency between the aqueous solution 13 and the exhaust gas higher. The critical temperature of the temperature sensor 4 is preset and stored in the controller 9. When the temperature of the aqueous solution 13 reaches the critical temperature, the temperature sensor 4 transmits the sensed temperature signal to the controller 9, and the controller 9 controls the second electric valve to open. This allows the aqueous solution 13 to be discharged through the outlet pipe 25. When the aqueous solution 13 is completely discharged and the level sensor 5 does not detect the water level, the level sensor 5 transmits a signal to the controller 9. The controller 9 controls the first electric valve to open, injecting new water into the waste heat recovery tank 21 through the inlet pipe 22 to carry out a new round of waste gas waste heat recovery operation. Heat exchange can be carried out between the aqueous solution 13 and the waste gas, and the heated aqueous solution 13 can be exported to the equipment to be heated for use, maximizing the recovery and utilization of heat in the waste gas and reducing the temperature of the waste gas emitted into the environment, effectively reducing environmental pollution. At the same time, the setting of the auxiliary heat absorption element can accelerate the heating of the aqueous solution 13 and continue to absorb heat from the waste gas during the replacement of the aqueous solution 13. By introducing the second heat conduction pipe 23 into the industrial kiln 8, the thermal efficiency of the kiln is improved and fuel energy consumption is saved. The setting of the purification chamber 10 removes harmful gases contained in the waste gas.

[0052] The above description is merely a preferred embodiment of the present invention; however, 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 technical scope disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. An industrial kiln waste heat recovery device comprising an industrial kiln (8) and a waste heat recovery tank (21), characterized by: A first heat pipe (11) connects the industrial kiln (8) and the waste heat recovery box (21). A controller (9) is installed on the upper surface of the waste heat recovery box (21). An inlet pipe (22) with a first electric valve is connected to the upper surface of the waste heat recovery box (21). The bottom end of the inlet pipe (22) penetrates the upper surface of the waste heat recovery box (21) and extends into the waste heat recovery box (21). An outlet pipe (25) with a second electric valve is connected to the lower part of the side surface of the waste heat recovery box (21). The outlet pipe (25) penetrates the right side surface of the waste heat recovery box (21). Inside the waste heat recovery box (21), on the upper surface... A baffle plate (241) is fixedly connected to the inner wall of the right box surface. The baffle plate (241), the upper box surface and the right box surface form a purification chamber (10). A flow hole (242) is opened on the side end of the baffle plate (241). A second heat pipe (23) is connected to the upper part of the side box surface of the waste heat recovery box (21). The second heat pipe (23) is located above the liquid outlet pipe (25) and is connected to the purification chamber (10). An aqueous solution (13) is injected into the waste heat recovery box (21). A plurality of uniformly distributed auxiliary heat absorption components are fixedly connected to the inner wall of the waste heat recovery box (21). The auxiliary heat-absorbing component is a heat-absorbing block (31) connected to the inner wall of the waste heat recovery box (21). The heat-absorbing block (31) has a cavity (33) inside, which is filled with heat-conducting oil (32). The heat-absorbing block (31) has multiple evenly distributed water-guiding holes (34) at its outer end. The heat-absorbing block (31) has a hollow frustum structure and is made of heat-conducting material. The waste heat recovery box (21) is provided with a heat transfer structure (7). The heat transfer structure (7) includes a connecting pipe (71), an annular heat transfer pipe (72) connected to the first heat conduction pipe (11) through the connecting pipe (71), a main heat transfer pipe (74) fixed and evenly distributed on the annular heat transfer pipe (72), and at least one auxiliary heat transfer pipe (73) fixed on the main heat transfer pipe (74). The annular heat transfer pipe (72) is connected to the connecting pipe (71), the main heat transfer pipe (74) is connected to the annular heat transfer pipe (72), and the auxiliary heat transfer pipe (73) is connected to the main heat transfer pipe (74). The main heat transfer pipe (74) faces the heat absorption block (31), and the auxiliary heat transfer pipe (73) is U-shaped or V-shaped. The purification chamber (10) includes multiple activated carbon adsorption layers (14), which are located in the gas passage area inside the second heat pipe (23); A temperature sensor (4) is fixedly connected to the left inner wall of the waste heat recovery box (21). The temperature sensor (4) is located between two heat absorption blocks (31) and is electrically connected to the controller (9).

2. The industrial kiln waste heat recovery device according to claim 1, characterized in that: At least one heat-conducting part (6) is fixed between each pair of adjacent heat-absorbing blocks (31).

3. The industrial kiln waste heat recovery device according to claim 1, characterized in that: The bottom of the waste heat recovery box (21) is fixedly connected to an electric motor (26), which is electrically connected to the controller (9). The output end of the electric motor (26) is connected to a spiral blade (27), which penetrates and extends into the waste heat recovery box (21). The spiral blade (27) is located inside the heat absorption block (31).

4. The industrial kiln waste heat recovery device according to claim 1, characterized in that: A liquid level sensor (5) is fixedly connected to the outer end of the waste heat recovery box (21). The liquid level sensor (5) is electrically connected to the controller (9). The liquid level sensor (5) and the bottom of the waste heat recovery box (21) are located on the same horizontal plane.

5. The industrial kiln waste heat recovery device according to claim 1, characterized in that: The horizontal liquid level of the aqueous solution (13) is always lower than the horizontal level of the bottom of the flow hole (242), and a filter screen (243) is provided in the flow hole (242).

6. The industrial kiln waste heat recovery device according to claim 1, characterized in that: A heat insulation layer (12) is fixedly connected to the outer end of the first heat pipe (11).

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