A kiln waste heat utilization device

Abstract

The application relates to a kiln waste heat utilization technical field, in particular to a kiln waste heat utilization equipment, which comprises a heat exchange box, one side of the heat exchange box is fixed with an air inlet pipe, the other side of the heat exchange box is fixed with an air outlet pipe, a plurality of heat exchange pipes are fixed in the heat exchange box in sequence, two adjacent heat exchange pipes are communicated with each other, the leftmost heat exchange pipe is further connected with a water pump through a water outlet pipe, the rightmost heat exchange pipe is further communicated with an external water source through a water inlet pipe, flow guide plates are fixed in the heat exchange box between the adjacent heat exchange pipes, flow guide holes penetrating through the flow guide plates are arranged on the flow guide plates, the flow guide holes on the adjacent flow guide plates are arranged on the two sides in the heat exchange box, water spraying plates are fixed in the heat exchange box above the heat exchange pipes, a plurality of spraying holes are uniformly arranged on the bottom of each water spraying plate, a connecting pipe is fixed on each water spraying plate, and the connecting pipe is communicated with a water spraying pipe. The high-temperature flue gas flows in an S shape in the heat exchange box, and the heat exchange efficiency of the flue gas and the clean water can be effectively increased.

Description

Technical Field

[0001] This invention relates to the field of kiln waste heat utilization technology, and in particular to a kiln waste heat utilization device. Background Technology

[0002] The firing temperature inside the kiln is very high. After firing in a traditional kiln, the high-temperature waste heat flue gas is discharged through the flue pipe and then the heat is recovered through a waste heat recovery device.

[0003] Patent application number CN202411005799.3 discloses a direct-inlet kiln exhaust gas waste heat utilization device, including an exhaust gas collection frame, an inlet pipe, and an outlet pipe. It also includes a water pump I, pipes, heat-conducting plates, a scraper, a liquid storage tank, a cover plate, a water pump II, a three-way valve, a connecting pipe, a connecting frame, a lifting mechanism, and a sealing mechanism. Two water pumps I are installed on the exhaust gas collection frame, and the pipes are installed inside the exhaust gas collection frame, with both ends of the pipes connected to the two water pumps I respectively. In use, the kiln exhaust gas is introduced through the inlet pipe. The exhaust gas is discharged into the exhaust gas collection box, and then discharged from the outlet pipe, allowing the exhaust gas to pass through the collection box. Next, water pump I on the left draws clean water into the pipe, where it is heated within the collection box. Heat-conducting fins absorb heat and further heat the water, accelerating its temperature rise. Then, water pump I on the right extracts the hot water from the pipe. This process recovers and utilizes the waste heat from the kiln exhaust gas. However, in this type of waste heat recovery device, the exhaust gas enters through the inlet pipe and exits directly through the outlet pipe during the heat exchange process, which cannot guarantee the residence time of heat within the collection box, resulting in low heat exchange efficiency.

[0004] This invention was proposed in response to the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a kiln waste heat utilization device.

[0006] This invention can be achieved through the following technical solutions:

[0007] This invention discloses a kiln waste heat utilization device, comprising a heat exchange box. A flue gas inlet pipe is fixed to one side of the heat exchange box, and a flue gas outlet pipe is fixed to the other side. Multiple heat exchange tubes are sequentially fixed inside the heat exchange box, with adjacent heat exchange tubes interconnected. The leftmost heat exchange tube is connected to a water pump via a water outlet pipe, and the rightmost heat exchange tube is connected to an external water source via a water inlet pipe. Guide plates are fixed inside the heat exchange box between adjacent heat exchange tubes, and each guide plate has a through-hole. The through-holes on adjacent guide plates are respectively located on both sides inside the heat exchange box. A water spray plate is fixed inside the heat exchange box above each heat exchange tube, with spray holes evenly distributed at the bottom of the water spray plate. A connecting pipe is fixed to each water spray plate, and the connecting pipe is connected to a water spray pipe. The water spray pipe is connected to a cleaning water source via a high-pressure water pump. High-temperature flue gas enters the heat exchange box through the inlet pipe. After entering the heat exchange box, the flue gas passes through the guide holes of each guide plate in sequence, and then exits through the exhaust pipe. Clean water enters the heat exchange box through the inlet pipe via a water pump, then passes through each heat exchange tube and exits through the outlet pipe. As the clean water flows inside the heat exchange tubes, heat exchange occurs between the high-temperature flue gas and the clean water, raising the water temperature. This device has multiple guide plates fixed sequentially inside the heat exchange box, each guide plate having guide holes, and adjacent guide holes are respectively positioned... Inside the heat exchanger, the flue gas flows in an S-shape on both sides, which effectively increases the distance the flue gas travels within the heat exchanger and thus increases its residence time. This significantly improves the heat exchange efficiency between the flue gas and clean water. After a period of heat exchange, dust particles in the flue gas adhere to the surface of the heat exchange tubes. A high-pressure water pump draws water from the cleaning source and sprays it at high speed through nozzles on a spray plate. The water flows down the heat exchange tubes, carrying away the dust particles. The dust and water are then discharged through a slag discharge pipe.

[0008] Preferably, a conical slag-collecting tube is fixed on the heat exchange box below the heat exchange tube, and a slag discharge pipe with a valve is fixed at the bottom of the slag-collecting tube.

[0009] Preferably, the slag discharge pipe has two valves. During flue gas heat exchange, dust in the heat exchange box will naturally settle to the slag discharge pipe. First, open the valve above the slag discharge pipe, and the dust will fall into the slag discharge pipe between the two valves. Then, close the valve above the slag discharge pipe and open the valve below the slag discharge pipe to discharge the dust. This achieves dust discharge during the heat exchange process and prevents high-temperature flue gas from being discharged from the slag discharge pipe.

[0010] Compared with existing technologies, the present invention has the following advantages:

[0011] This device has multiple guide plates fixed sequentially inside the heat exchange box, each with guide holes. Adjacent guide holes are located on opposite sides of the heat exchange box, causing the flue gas to flow in an S-shape. This effectively increases the distance the flue gas travels within the heat exchange box, thereby increasing its residence time and heat exchange efficiency between the flue gas and clean water. After a period of heat exchange, dust particles in the flue gas adhere to the surface of the heat exchange tubes. A high-pressure water pump draws water from the cleaning source and sprays it at high speed through nozzles on a spray plate. The water flows down the heat exchange tubes, carrying away the dust particles. The dust and water are then discharged through a slag discharge pipe. Attached Figure Description

[0012] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure from another angle of the present invention;

[0015] Figure 3 for Figure 2 Sectional view at point AA;

[0016] In the diagram: 1. Heat exchanger; 2. Flue gas inlet pipe; 3. Flue gas outlet pipe; 4. Heat exchanger tube; 5. Water inlet pipe; 6. Water outlet pipe; 7. Water spray pipe; 8. Connecting pipe; 9. Water spray plate; 10. Spray hole; 11. Guide plate; 12. Guide hole; 13. Slag collection pipe; 14. Slag discharge pipe; 15. Valve; Detailed Implementation

[0017] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings: Example

[0018] like Figures 1 to 3As shown in the figure, this embodiment discloses a kiln waste heat utilization device, including a heat exchange box 1. A flue gas inlet pipe 2 is fixed on one side of the heat exchange box 1, and a flue gas outlet pipe 3 is fixed on the other side of the heat exchange box 1. Multiple heat exchange tubes 4 are fixed in sequence inside the heat exchange box 1. Two adjacent heat exchange tubes 4 are interconnected. The leftmost heat exchange tube 4 is also connected to a water pump through a water outlet pipe 6, and the rightmost heat exchange tube 4 is also connected to an external water source through a water inlet pipe 5. A guide plate 11 is fixed inside the heat exchange box 1 between adjacent heat exchange tubes 4. A guide hole 12 is provided on the guide plate 11, penetrating the guide plate 11. The guide holes 12 on adjacent guide plates 11 are respectively located on both sides inside the heat exchange box 1. A water spray plate 9 is fixed inside the heat exchange box 1 above the heat exchange tubes 4. Spray holes 10 are evenly provided at the bottom of the water spray plate 9. A connecting pipe 8 is fixed on the water spray plate 9. The connecting pipe 8 is connected to a water spray pipe 7. The water spray pipe 7 is connected to a cleaning water source through a high-pressure water pump. High-temperature flue gas enters the heat exchange box 1 through the inlet pipe 2. After entering the heat exchange box 1, the flue gas passes through the guide holes 12 of each guide plate 11 in sequence, and then exits through the exhaust pipe 3. Clean water enters the heat exchange box 1 through the inlet pipe 5 via a water pump. The clean water then passes through each heat exchange tube 4 and exits through the outlet pipe 6. As the clean water flows inside the heat exchange tubes 4, heat exchange occurs between the high-temperature flue gas and the clean water, raising the water temperature. This device has multiple guide plates 11 fixed sequentially inside the heat exchange box 1, and each guide plate 11 is provided with guide holes 12. Adjacent guide holes 12... The flue gas is arranged on both sides inside the heat exchange box 1. The flue gas flows in an S-shape inside the heat exchange box 1, which can effectively increase the distance the flue gas flows in the heat exchange box 1, thereby increasing the residence time of the flue gas in the heat exchange box 1. This can effectively increase the heat exchange efficiency between the flue gas and the clean water. After heat exchange for a period of time, the dust in the flue gas adheres to the surface of the heat exchange tube 4. Water is drawn from the cleaning water source by a high-pressure water pump and sprayed out at high speed through the spray holes 10 on the water spray plate 9. After the water is sprayed onto the heat exchange tube 4, it flows down along the heat exchange tube 4, carrying away the dust adhering to the heat exchange tube 4. The dust and water are discharged through the slag discharge pipe 14 for treatment.

[0019] Among them, a conical slag-collecting tube 13 is fixed on the heat exchange box 1 below the heat exchange tube 4, and a slag discharge tube 14 with a valve 15 is fixed at the bottom of the slag-collecting tube 13. Example

[0020] This embodiment discloses a kiln waste heat utilization device. Based on the structure and principle of Embodiment 1, this embodiment has two valves 15 on the slag discharge pipe 14. During flue gas heat exchange, dust in the heat exchange box 1 will naturally settle to the slag discharge pipe 14. First, the valve 15 above the slag discharge pipe 14 is opened, and the dust falls into the slag discharge pipe 14 between the two valves 15. Then, the valve 15 above the slag discharge pipe 14 is closed, and the valve 15 below the slag discharge pipe 14 is opened to discharge the dust. This achieves dust discharge during the heat exchange process and prevents high-temperature flue gas from being discharged from the slag discharge pipe 14.

[0021] The above are merely preferred embodiments of the present invention. It should be noted that, for those skilled in the art, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the technical principles of the present invention. These changes, modifications, substitutions and variations should also be considered within the scope of protection of the present invention.

Claims

1. A kiln waste heat utilization device, comprising a heat exchange box, one side of which is fixed with an inlet flue pipe, and the other side of which is fixed with an exhaust flue pipe, characterized in that, Multiple heat exchange tubes are fixed sequentially inside the heat exchange box. Adjacent heat exchange tubes are interconnected. The leftmost heat exchange tube is connected to a water pump via an outlet pipe, and the rightmost heat exchange tube is connected to an external water source via an inlet pipe. A guide plate is fixed inside the heat exchange box between adjacent heat exchange tubes. Each guide plate has a through-hole. The through-holes on adjacent guide plates are located on both sides inside the heat exchange box. A water spray plate is fixed inside the heat exchange box above each heat exchange tube. Spray holes are evenly distributed at the bottom of the water spray plate. A connecting pipe is fixed to each water spray plate and is connected to a water spray pipe. The water spray pipe is connected to a cleaning water source via a high-pressure water pump.

2. The kiln waste heat utilization equipment according to claim 1, characterized in that: A conical slag-collecting tube is fixed on the heat exchange box below the heat exchange tube, and a slag discharge pipe with a valve is fixed at the bottom of the slag-collecting tube.

3. The kiln waste heat utilization equipment according to claim 2, characterized in that: There are two valves on the slag discharge pipe.

Images