A waste heat recovery device for energy-saving tunnel kiln

Abstract

The present invention is applicable to the technical field of heat recovery of tunnel kilns, and in particular, relates to a waste heat recovery device for an energy-saving tunnel kiln, comprising a water storage tank, and a plurality of supporting columns are connected to the outside of the water storage tank, and the surfaces of the plurality of supporting columns are commonly connected to a supporting plate, and the surface of the supporting plate is connected to a plurality of waste heat recovery boxes, and a ventilation flat tube is arranged inside the waste heat recovery box. The present invention is provided with a waste heat recovery box, a water storage tank, a ventilation flat tube, a first electromagnetic water valve, a water supply hard pipe, a first electromagnetic water valve, a second electromagnetic water valve, a first temperature sensor and a water level sensor, and when hot gas is introduced into the interior of a plurality of waste heat recovery boxes so that the heat in the hot gas is absorbed by the cold water inside the waste heat recovery box, it can not only ensure that the heat energy of the hot gas is fully utilized, but also avoid that the water at the end of the hot gas heat energy recovery fails to meet the temperature requirement, thereby greatly improving the heat energy recovery efficiency of the waste heat recovery device of the energy-saving tunnel kiln.

Description

Technical Field

[0001] The invention relates to the technical field of heat recovery of tunnel kilns, in particular to waste heat recovery equipment of energy-saving tunnel kilns. Background Art

[0002] Tunnel kilns are long strips of heat treatment equipment that are widely used in the continuous firing process of materials such as ceramics, bricks, tiles, etc. Tunnel kilns evenly distribute heat within their long strip structure, so that the materials are evenly heated and fired as they pass through the kiln. Tunnel kilns consume a lot of energy during operation, especially when firing materials at high temperatures. Heat is generated inside the kiln, but a lot of heat is lost to the environment through the exhaust and the kiln body, resulting in energy waste.

[0003] Due to the high energy consumption of tunnel kilns, the development and utilization of waste heat recovery technology has become very important. Waste heat recovery can significantly reduce energy consumption by recovering the hot air discharged from the kiln to preheat air or materials, or convert it into other forms of energy, thereby improving overall energy efficiency.

[0004] At present, many energy-saving tunnel kilns are equipped with heat recovery equipment with cold water heat absorption. These heat recovery equipment can make cold water absorb the heat energy of the hot air discharged from the tunnel kiln to produce hot water that can be used in life or industry. However, the heat recovery equipment with cold water heat absorption in the prior art has the following technical defects when working: during the circulation of hot air, some cold water at the end of the hot air circulation cannot fully absorb the heat energy, resulting in this part of water being put into use before reaching the appropriate temperature, resulting in poor use effect of the hot water put into heat recovery. In this regard, the present invention provides a waste heat recovery device for an energy-saving tunnel kiln to solve the above technical problems. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide an energy-saving tunnel kiln waste heat recovery device, aiming to solve the technical problems mentioned in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A waste heat recovery device for an energy-saving tunnel kiln, comprising a water storage tank, and a plurality of support columns are connected to the outside of the water storage tank, the surfaces of the plurality of support columns are commonly connected to a support plate, the surface of the support plate is connected to a plurality of waste heat recovery boxes, and a ventilation flat tube is arranged inside the waste heat recovery box, two adjacent ventilation flat tubes are interconnected, and one end of the two ventilation flat tubes farthest apart is respectively connected to a hot gas inlet pipe and a hot gas outlet pipe;

[0008] The two sides of the outside of the waste heat recovery box are respectively connected to a water supply hard pipe and a drainage pipe, and the outsides of the water supply hard pipe and the drainage pipe are respectively installed with a second electromagnetic water valve and a first electromagnetic water valve, one end of a plurality of the drainage pipes is commonly connected to a hot water collection pipe, and a first temperature sensor and a water level sensor are installed inside the waste heat recovery box;

[0009] A plurality of spoiler blades are arranged at equal distances on the outside of the water delivery rigid pipe, and a water delivery hose is connected to one end of the water delivery rigid pipe. A linkage component is commonly arranged on the outside of the water storage tank and the plurality of water delivery rigid pipes, and the linkage component is used to drive the plurality of water delivery rigid pipes to perform clockwise and counterclockwise reciprocating rotational motion inside the plurality of waste heat recovery boxes.

[0010] Furthermore, one end of the water supply hose away from the water supply hard pipe is connected to the interior of the water storage tank.

[0011] Furthermore, the linkage component includes:

[0012] A rolling bearing is installed on the surface of the waste heat recovery box, and a water delivery pipe is rotatably connected to the inside of the rolling bearing, and a secondary transmission sprocket is sleeved on the outside of the water delivery pipe;

[0013] A driving motor is installed on the surface of the water tank, and the output end of the driving motor is connected to a rotating rod. The outer side of the rotating rod is sleeved with a main transmission sprocket, and the outer sides of the main transmission sprocket and several auxiliary transmission sprockets are meshed and connected with a transmission chain.

[0014] Furthermore, a plurality of the spoiler blades are evenly distributed from high to low on the outside of the water delivery hard pipe, and the spoiler blades are in a slurry shape.

[0015] Furthermore, the ventilation flat tube is a U-shaped structure, and the ventilation flat tube is made of a heat-conducting material.

[0016] Furthermore, the outer side of the hot gas exhaust pipe is connected to a hot gas delivery pipe, and a second solenoid valve and a first solenoid valve are respectively installed on the outer sides of the hot gas delivery pipe and the hot gas exhaust pipe, a second temperature sensor is installed inside the hot gas exhaust pipe, and a cylindrical ventilation flat tube is sleeved on the outer side of the hot water collection pipe.

[0017] Furthermore, both ends of the hot air delivery pipe are respectively connected to the hot air discharge pipe and the inside of the cylindrical ventilation flat tube, and the outer side of the hot water collection pipe is closely attached to the inner wall of the cylindrical ventilation flat tube.

[0018] Furthermore, a PLC controller is installed on the side of the supporting column.

[0019] The waste heat recovery equipment of an energy-saving tunnel kiln provided by the present invention is provided with a waste heat recovery box, a water storage tank, a ventilation flat pipe, a first electromagnetic water valve, a water supply hard pipe, a first electromagnetic water valve, a second electromagnetic water valve, a first temperature sensor and a water level sensor. When the hot gas is introduced into the interior of multiple waste heat recovery boxes so that the heat in the hot gas is absorbed by the cold water inside the waste heat recovery box, it can not only ensure that the thermal energy of the hot gas is fully utilized, but also avoid that the water at the end of the hot gas heat energy recovery cannot meet the temperature requirement, thereby greatly improving the heat energy recovery efficiency of the waste heat recovery equipment of the energy-saving tunnel kiln. In addition, by providing spoiler blades and linkage components, when the hot gas is recovering heat energy, the water inside the waste heat recovery box can be continuously disturbed, so that the cold water and the surface of the ventilation flat pipe generate stronger turbulence, which helps to break the thermal boundary layer and promote faster heat transfer from the hot gas to the cold water, thereby greatly improving the heating efficiency of the water inside the waste heat recovery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the structure of a waste heat recovery device for an energy-saving tunnel kiln.

[0021] Figure 2 It is a partial structural schematic diagram of a waste heat recovery device for an energy-saving tunnel kiln.

[0022] Figure 3 The present invention is a partial structural schematic diagram of a hot gas exhaust pipe, a hot gas delivery pipe, a first electromagnetic gas valve, a second electromagnetic gas valve and a second temperature sensor in a waste heat recovery device of an energy-saving tunnel kiln.

[0023] In the figure: 1. water storage tank; 2. hot air inlet pipe; 3. support column; 4. support plate; 5. ventilation flat pipe; 6. waste heat recovery box; 7. cylindrical ventilation flat pipe; 8. transmission chain; 9. drive motor; 10. rotating rod; 11. main transmission sprocket; 12. hot air discharge pipe; 13. PLC controller; 14. drain pipe; 15. first electromagnetic water valve; 16. hot water collection pipe; 17. water supply hose; 18. second electromagnetic water valve; 19. water level sensor; 20. auxiliary transmission sprocket; 21. first temperature sensor; 22. water supply hard pipe; 23. spoiler blade; 24. second temperature sensor; 25. first electromagnetic air valve; 26. second electromagnetic air valve; 27. hot air delivery pipe; 28. rolling bearing. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0026] like Figure 1 and Figure 2 As shown, an energy-saving tunnel kiln waste heat recovery device provided by an embodiment of the present invention comprises a water storage tank 1, a water injection pipe is arranged on the side of the water storage tank 1, and the water injection pipe can be connected to an external cold water pipe, and a plurality of support columns 3 are connected to the outside of the water storage tank 1, and a support plate 4 is commonly connected to the surfaces of the plurality of support columns 3, and a plurality of waste heat recovery boxes 6 are connected to the surface of the support plate 4, and a ventilation flat tube 5 is arranged inside the waste heat recovery box 6, and the ventilation flat tube 5 is a U-shaped structure, and the ventilation flat tube 5 is made of a heat-conducting material. , so that when the hot air enters the interior of the ventilation flat tube 5, the heat of the hot air can be quickly and efficiently transferred to the cold water inside the waste heat recovery box 6 through the ventilation flat tube 5, so as to improve the heat energy recovery efficiency. The two adjacent ventilation flat tubes 5 are connected to each other, and one end of the two ventilation flat tubes 5 farthest apart is respectively connected to the hot gas inlet pipe 2 and the hot gas outlet pipe 12. The hot air with a higher temperature discharged from the tunnel kiln enters the interior of the plurality of ventilation flat tubes 5 through the hot gas inlet pipe 2, and the low-temperature hot air with fully recovered heat energy will be discharged through the hot gas outlet pipe 12;

[0027] The two sides of the outer side of the waste heat recovery box 6 are respectively connected to the water supply hard pipe 22 and the drainage pipe 14, and the second electromagnetic water valve 18 and the first electromagnetic water valve 15 are respectively installed on the outer sides of the water supply hard pipe 22 and the drainage pipe 14. One end of several drainage pipes 14 is commonly connected to the hot water collection pipe 16. The first temperature sensor 21 and the water level sensor 19 are installed inside the waste heat recovery box 6. The hot water collection pipe 16 can be connected to the domestic hot water end or the industrial hot water end.

[0028] A PLC controller 13 is installed on the side of the supporting column 3 .

[0029] In one embodiment of the present invention, when using the waste heat recovery device to recover heat energy from the high-temperature hot air discharged from the tunnel kiln, the staff first presets the required hot water temperature on the PLC controller 13 according to actual needs, and then opens a plurality of second electromagnetic water valves 18, so that the cold water stored in the water storage tank 1 is injected into the interior of a plurality of waste heat recovery tanks 6 through the water supply hose 17 and the water supply hard pipe 22. When a sufficient amount of cold water is injected into the waste heat recovery tank 6, the water level sensor 19 arranged at the top of the waste heat recovery tank 6 will sense the water level and transmit the high water level signal to the PLC controller 13, and the PLC controller 13 controls the second electromagnetic water valve 18 to close. At this time, a sufficient amount of cold water is stored in the plurality of waste heat recovery tanks 6.

[0030] Subsequently, the high-temperature hot air is introduced into the hot air inlet pipe 2, and the hot air enters into a plurality of interconnected ventilation flat tubes 5 through the hot air inlet pipe 2, and the heat of the hot air is absorbed by the cold water in the waste heat recovery box 6 to achieve the purpose of heat recovery. As the hot air continuously flows in the plurality of ventilation flat tubes 5, the temperature of the cold water in the waste heat recovery box 6 gradually rises to a higher level. When the temperature of the hot water in a certain waste heat recovery box 6 rises to the preset required hot water temperature, the first temperature sensor 21 transmits the temperature signal to the PLC controller 13, and the PLC controller 13 controls the first electromagnetic water valve 15 to open, so that the hot water drain pipe 14 at an appropriate temperature in the waste heat recovery box 6 is input into the hot water collection pipe 16 and put into other uses. After a preset time (that is, the water in the waste heat recovery box 6 can be fully discharged within the preset time), the PLC controller 13 closes the first electromagnetic water valve 15, and simultaneously opens the second electromagnetic water valve 18, so that the waste heat recovery box 6 is filled with a sufficient amount of cold water again.

[0031] It can be understood that the hot air circulates in an orderly manner inside the multiple ventilation flat tubes 5 one by one, which means that more heat in the hot air will be absorbed by the cold water inside the waste heat recovery box 6 corresponding to the ventilation flat tube 5 that is earlier in the circulation order, while the hot air in the ventilation flat tube 5 that is later in the circulation order actually contains less heat, and thus the cold water in the waste heat recovery box 6 that is later in the circulation order actually heats up more slowly. In the technical solution of the present application, the temperature of the water inside the waste heat recovery box 6 is monitored by the first temperature sensor 21, so that the cold water in the waste heat recovery box 6 in any circulation order can be guaranteed to rise to the preset required hot water temperature. Therefore, as long as the number of waste heat recovery boxes 6 is reasonably set, the thermal energy in the hot air can be fully recovered, and in the entire recovery process, the temperature of the warm water put into the hot water collection pipe 16 can also meet the requirements, thereby achieving the purpose of ensuring that the thermal energy of the hot air is fully utilized and avoiding the water at the end of the hot air heat energy recovery failing to meet the temperature requirements, thereby greatly improving the thermal energy recovery efficiency of the waste heat recovery equipment of the energy-saving tunnel kiln.

[0032] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, a plurality of spoiler blades 23 are equidistantly arranged on the outside of the water delivery hard pipe 22, and the plurality of spoiler blades 23 are evenly distributed from high to low on the outside of the water delivery hard pipe 22, and the spoiler blades 23 are in a slurry shape, and one end of the water delivery hard pipe 22 is connected to a water delivery hose 17, and the end of the water delivery hose 17 away from the water delivery hard pipe 22 is connected to the interior of the water storage tank 1, and the water storage tank 1 and the outside of the plurality of water delivery hard pipes 22 are jointly provided with a linkage component, and the linkage component is used to drive the plurality of water delivery hard pipes 22 to perform clockwise and counterclockwise reciprocating rotational motion inside the plurality of waste heat recovery boxes 6.

[0033] The linkage components include:

[0034] A rolling bearing 28 is installed on the surface of the waste heat recovery box 6, and the water delivery hard pipe 22 is rotatably connected to the inside of the rolling bearing 28, and the outer side of the water delivery hard pipe 22 is sleeved with a secondary transmission sprocket 20;

[0035] A driving motor 9 is mounted on the surface of the water tank 1, and a rotating rod 10 is connected to the output end of the driving motor 9. A main transmission sprocket 11 is sleeved on the outer side of the rotating rod 10, and a transmission chain 8 is meshed and connected to the outer sides of the main transmission sprocket 11 and a plurality of auxiliary transmission sprockets 20.

[0036] When the heat energy of the hot gas is transferred to the cold water inside the multiple waste heat recovery boxes 6 by the above-mentioned technical solution of circulating the hot gas one by one, those skilled in the art have found that since the position of the ventilation flat tube 5 is fixed and the water inside the waste heat recovery box 6 is also stationary, there is a thermal boundary layer effect between the ventilation flat tube 5 and the water, resulting in that the heat of the hot gas in the ventilation flat tube 5 cannot be transferred to the cold water in different areas inside the waste heat recovery box 6 more quickly, and thus the heating rate of the cold water inside the waste heat recovery box 6 is slowed down;

[0037] In this embodiment, in view of the above technical problems, when the hot air enters the inside of the plurality of ventilation flat tubes 5, the driving motor 9 can be turned on by the PLC controller 13, and the driving motor 9 drives the rotating rod 10 and the main transmission sprocket 11 to rotate, so that the main transmission sprocket 11 drives the plurality of auxiliary transmission sprockets 20 to rotate synchronously through the transmission chain 8, and the auxiliary transmission sprocket 20 drives the water delivery hard pipe 22 to rotate through the rolling bearing 28, so that the plurality of slurry-like spoiler blades 23 arranged from high to low on the outside of the water delivery hard pipe 22 can continuously disturb the water inside the waste heat recovery tank 6, so that the cold water and the surface of the ventilation flat tube 5 generate stronger turbulence, which helps to break the thermal boundary layer and promote faster heat transfer from the hot air to the cold water, thereby greatly improving the heating efficiency of the water inside the waste heat recovery tank 6;

[0038] It is understandable that when the driving motor 9 drives the rotating rod 10 to rotate, it should be ensured that the driving motor 9 drives the rotating rod 10 to rotate back and forth alternately at a certain angle clockwise and counterclockwise to avoid the water supply hard pipe 22 continuously rotating in one direction and causing the water supply hose 17 to become entangled.

[0039] like Figure 1 and Figure 2As shown, in one embodiment of the present invention, the outer side of the hot gas exhaust pipe 12 is connected to a hot gas delivery pipe 27, and the outer sides of the hot gas delivery pipe 27 and the hot gas exhaust pipe 12 are respectively installed with a second electromagnetic valve 26 and a first electromagnetic valve 25, the inside of the hot gas exhaust pipe 12 is installed with a second temperature sensor 24, the outer side of the hot water collecting pipe 16 is sleeved with a cylindrical ventilation flat pipe 7, the two ends of the hot gas delivery pipe 27 are respectively connected to the inside of the hot gas exhaust pipe 12 and the cylindrical ventilation flat pipe 7, and the outer side of the hot water collecting pipe 16 is tightly attached to the inner wall of the cylindrical ventilation flat pipe 7.

[0040] In this embodiment, those skilled in the art also find that when the preset required hot water temperature is set to a lower level, the temperature of the hot gas discharged through the hot gas discharge pipe 12 will still be at a higher level;

[0041] To avoid wasting the heat energy of the hot air, when the second temperature sensor 24 senses that the temperature of the hot air discharged from the hot air discharge pipe 12 is still high, the first solenoid valve 25 is closed and the second solenoid valve 26 is opened, so that the hot air inside the hot air discharge pipe 12 enters the hot air delivery pipe 27 and is input into the cylindrical ventilation flat tube 7 through the hot air delivery pipe 27. Since the cylindrical ventilation flat tube 7 and the hot water collecting pipe 16 are in a close contact with each other, the cylindrical ventilation flat tube 7 can keep the hot water inside the hot water collecting pipe 16 warm, so that the hot water in the hot water collecting pipe 16 can still maintain a good temperature state when it is transferred to the water use location.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste heat recovery device for an energy-saving tunnel kiln, comprising a water storage tank (1), wherein the outer side of the water storage tank (1) is connected to a plurality of support columns (3), and the surfaces of the plurality of support columns (3) are commonly connected to a support plate (4), characterized in that: The surface of the support plate (4) is connected to a plurality of waste heat recovery boxes (6), and a ventilation flat tube (5) is arranged inside the waste heat recovery box (6), two adjacent ventilation flat tubes (5) are interconnected, and one end of the two ventilation flat tubes (5) that are farthest apart is respectively connected to a hot air inlet pipe (2) and a hot air outlet pipe (12); The two sides of the outside of the waste heat recovery box (6) are respectively connected to a water supply hard pipe (22) and a drainage pipe (14), and the outsides of the water supply hard pipe (22) and the drainage pipe (14) are respectively installed with a second electromagnetic water valve (18) and a first electromagnetic water valve (15), one end of a plurality of the drainage pipes (14) is commonly connected to a hot water collection pipe (16), and a first temperature sensor (21) and a water level sensor (19) are installed inside the waste heat recovery box (6); A plurality of flow-disturbing blades (23) are arranged at equal distances on the outside of the water delivery hard pipe (22), and one end of the water delivery hard pipe (22) is connected to a water delivery hose (17). A linkage component is arranged on the outside of the water storage tank (1) and the plurality of water delivery hard pipes (22), and the linkage component is used to drive the plurality of water delivery hard pipes (22) to perform clockwise and counterclockwise reciprocating rotational motion inside the plurality of waste heat recovery tanks (6); The outside of the hot gas discharge pipe (12) is connected to a hot gas delivery pipe (27), and the outsides of the hot gas delivery pipe (27) and the hot gas discharge pipe (12) are respectively installed with a second electromagnetic valve (26) and a first electromagnetic valve (25); a second temperature sensor (24) is installed inside the hot gas discharge pipe (12); and the outside of the hot water collection pipe (16) is sleeved with a cylindrical ventilation flat pipe (7); The two ends of the hot air delivery pipe (27) are respectively connected to the hot air discharge pipe (12) and the interior of the cylindrical ventilation flat pipe (7), and the outer side of the hot water collection pipe (16) is tightly attached to the inner wall of the cylindrical ventilation flat pipe (7).

2. The waste heat recovery device for an energy-saving tunnel kiln according to claim 1, characterized in that: One end of the water supply hose (17) away from the water supply hard pipe (22) is connected to the interior of the water storage tank (1).

3. The waste heat recovery device for an energy-saving tunnel kiln according to claim 2, characterized in that: The linkage components include: A rolling bearing (28) is installed on the surface of the waste heat recovery box (6), and the water supply hard pipe (22) is rotatably connected to the inside of the rolling bearing (28), and the outer side of the water supply hard pipe (22) is sleeved with a secondary transmission sprocket (20); A driving motor (9) is mounted on the surface of the water storage tank (1), and the output end of the driving motor (9) is connected to a rotating rod (10), a main transmission sprocket (11) is sleeved on the outer side of the rotating rod (10), and a transmission chain (8) is meshedly connected to the outer sides of the main transmission sprocket (11) and a plurality of auxiliary transmission sprockets (20).

4. The waste heat recovery device for an energy-saving tunnel kiln according to claim 1, characterized in that: A plurality of the flow-disturbing blades (23) are evenly distributed from high to low on the outside of the water supply hard pipe (22), and the flow-disturbing blades (23) are in a slurry shape.

5. The waste heat recovery device for an energy-saving tunnel kiln according to claim 1, characterized in that: The ventilation flat tube (5) is a U-shaped structure, and the ventilation flat tube (5) is made of a heat-conducting material.

6. The waste heat recovery device for an energy-saving tunnel kiln according to any one of claims 1 to 5, characterized in that: A PLC controller (13) is installed on the side of the supporting column (3).

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