A spray tower with high efficiency of recovering waste heat

Abstract

The utility model discloses a kind of spray towers of high-efficiency waste heat recovery, including spray tower body, primary waste heat recovery tank and secondary waste heat recovery tank, support frame is equipped in the spray tower body, condensate pipe is movably connected on the support frame, spraying head is connected on the condensate pipe, filter plate is further equipped in the spray tower body, drainage funnel is equipped below the filter plate, hot water tank is equipped on the bottom wall of the spray tower body, the top of the hot water tank is connected with the water outlet end of the drainage funnel, the condensate pipe is connected with the hot water tank. The utility model is by being provided with primary waste heat recovery tank and secondary waste heat recovery tank and hot water tank, waste gas is recovered three times, compared with the traditional single waste heat recovery mode, greatly improve waste heat recovery efficiency, can make full use of waste heat in waste gas.

Description

Technical Field

[0001] This utility model relates to the field of spray towers, and in particular to a spray tower for efficient waste heat recovery. Background Technology

[0002] Industrial production, especially in industries such as chemical, metallurgical, and power generation, produces large quantities of high-temperature waste gases containing residual heat. If these high-temperature gases are directly released into the atmosphere, not only will a significant amount of heat energy be wasted, increasing energy costs for businesses, but the high-temperature waste gases may also alter the local temperature balance, negatively impacting the surrounding ecosystem. Furthermore, these waste gases often contain dust, harmful gases, and other impurities, and direct emission of such gases will exacerbate air pollution.

[0003] Traditional spray towers primarily function as dust removal and cooling towers, but their waste heat recovery capabilities are limited and their efficiency is low. They often only perform single waste heat recovery operations, and the heat in the exhaust gas cannot be effectively recovered. Furthermore, the recovered heat lacks a temperature gradient and cannot meet various temperature requirements. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to propose a spray tower for efficient waste heat recovery.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A high-efficiency waste heat recovery spray tower includes a spray tower body, a primary waste heat recovery tank, and a secondary waste heat recovery tank. A support frame is installed inside the spray tower body, and a condensate pipe is movably connected to the support frame. Spray heads are connected to the condensate pipe. A filter plate is also installed inside the spray tower body, and a drainage funnel is located below the filter plate. A hot water tank is installed on the bottom wall of the spray tower body, and the top of the hot water tank is connected to the outlet end of the drainage funnel. The condensate pipe is connected to the hot water tank. The primary waste heat recovery tank is located inside the spray tower body. The primary waste heat recovery box is located above the filter plate. One side of the primary waste heat recovery box has an air inlet pipe, one end of which penetrates the side wall of the spray tower. The other side of the primary waste heat recovery box has an air outlet pipe. The primary waste heat recovery box contains a primary heat exchange pipe, with its two ends connected to the air inlet pipe and the air outlet pipe, respectively. The secondary waste heat recovery box is connected to the air outlet of the spray tower via a connecting air pipe. The secondary waste heat recovery box contains an air chamber and a liquid chamber, with the air chamber communicating with the connecting air pipe.

[0007] Preferably, the hot water tank is provided with a water outlet pipe, which is connected to the water inlet of the pump. The pump has multiple water outlets, one of which is connected to the condensate pipe.

[0008] Preferably, an electromagnetic valve is provided at the outlet end of the diversion funnel, and a sensor is provided inside the hot water tank. The electromagnetic valve, the sensor, and the pump are all electrically connected to a controller located outside the spray tower.

[0009] Preferably, the spray tower body is provided with an inspection door, which is located at the lower part of the spray tower body.

[0010] Preferably, there are multiple primary waste heat recovery boxes, which are evenly arranged inside the spray tower. Each primary waste heat recovery box is equipped with a primary water inlet pipe and a primary water outlet pipe.

[0011] Preferably, the secondary waste heat recovery box is provided with a secondary water inlet pipe at the bottom and a secondary water outlet pipe at the top.

[0012] Preferably, the liquid chamber is provided with a plurality of secondary heat exchange tubes, one end of which is connected to the gas chamber and the other end of which is connected to the exhaust port of the secondary waste heat recovery box.

[0013] Preferably, the filter plate has a first activated carbon adsorption layer inside, a filter cotton is provided at the bottom of the first activated carbon adsorption layer, and a second activated carbon adsorption layer is provided at the bottom of the filter cotton.

[0014] By adopting the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows:

[0015] The advantages of the above technical solution, which differs from existing technologies, are as follows: This utility model performs three-stage waste heat recovery on waste gas by setting up a primary waste heat recovery box, a secondary waste heat recovery box, and a hot water box. Compared with the traditional single waste heat recovery method, this significantly improves the waste heat recovery efficiency and can make full use of the waste heat in the waste gas. The sprayed water is filtered by a filter plate and collected by a diversion funnel before entering the hot water box for reuse in spraying, reducing the amount of fresh water used and lowering water consumption. The primary waste heat recovery box is integrated inside the spray tower, and the secondary waste heat recovery box is connected to the spray tower via a connecting gas pipe, resulting in a compact overall structure and reduced equipment footprint. At the same time, through the waste heat recovery of the waste gas, hot water at three different temperatures can be obtained sequentially from the primary waste heat recovery box, the hot water box, and the secondary waste heat recovery box for use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a spray tower for efficient waste heat recovery in this embodiment;

[0018] Figure 2 This is a schematic diagram of the primary waste heat recovery box described in this embodiment.

[0019] The reference numerals used in the above figures are explained as follows:

[0020] 1. Spray tower body; 11. Condensate pipe; 12. Spray head; 13. Drainage funnel; 131. Solenoid valve; 14. Hot water tank; 15. Pump; 16. Filter plate; 2. Primary waste heat recovery tank; 21. Air inlet pipe; 22. Air outlet pipe; 23. Primary heat exchange pipe; 24. Primary water inlet pipe; 25. Primary water outlet pipe; 3. Secondary waste heat recovery tank; 31. Gas chamber; 32. Liquid chamber; 33. Connecting air pipe; 34. Secondary water inlet pipe; 35. Secondary water outlet pipe; 36. Exhaust port; 37. Secondary heat exchange pipe. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are only for illustrating the present invention and do not limit the scope of the present invention. Similarly, the following embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0022] Please see Figure 1 and Figure 2This embodiment provides a high-efficiency waste heat recovery spray tower, including a spray tower body 1, a primary waste heat recovery box 2, and a secondary waste heat recovery box 3. The spray tower body 1 has a support frame inside, and a condensate pipe 11 is movably connected to the support frame. A spray head 12 is connected to the condensate pipe 11. The spray tower body 1 also has a filter plate 16 inside, and a drainage funnel 13 is located below the filter plate 16. A hot water tank 14 is located on the bottom wall of the spray tower body 1, and the top of the hot water tank 14 is connected to the outlet end of the drainage funnel 13. The condensate pipe 11 is connected to the hot water tank 14. The primary waste heat recovery box 2 is located within the spray tower body 1. Inside the primary waste heat recovery box 2, and above the filter plate 16, an air inlet pipe 21 is provided on one side, and one end of the air inlet pipe 21 penetrates the side wall of the spray tower body 1. An air outlet pipe 22 is provided on the other side of the primary waste heat recovery box 2. A primary heat exchange pipe 23 is provided inside the primary waste heat recovery box 2, and the two ends of the primary heat exchange pipe 23 are respectively connected to the air inlet pipe 21 and the air outlet pipe 22. The secondary waste heat recovery box 3 is connected to the air outlet of the spray tower body 1 through a connecting air pipe 33. The secondary waste heat recovery box 3 is provided with an air chamber 31 and a liquid chamber 32. The air chamber 31 is connected to the connecting air pipe 33.

[0023] The air outlet of the spray tower body 1 is located at the top, forming a relatively closed environment for waste gas treatment and waste heat recovery within the spray tower body 1. The support frame, made of high-temperature resistant metal, is installed on the inner wall of the spray tower body 1 to support the condensate pipe 11. The condensate pipe 11 is made of stainless steel, with one end connected to an external water supply source and the other end connected to a hot water tank 14 via a pump 15. This allows the condensate from the external water supply or water from the hot water tank 14 to be transported to the spray heads 12. Multiple spray heads 12 are connected to the condensate pipe 11 and are evenly distributed on the condensate pipe 11, spraying the condensate in the condensate pipe 11 in a mist form. This increases the contact area with the waste gas, improves the cooling effect, and effectively recovers waste heat from the waste gas. The filter plate 16 is a plate-shaped structure made of high-strength material, with multiple layers of filter material inside to filter out contaminants in the sprayed water, ensuring that the water flowing into the hot water tank 14 is free of solid particles. The guide funnel 13 is fixedly installed on the inner wall of the spray tower body 1, roughly funnel-shaped, and made of smooth metal material. It quickly collects the filtered liquid and guides it to the hot water tank 14, reducing liquid residue. The hot water tank 14 is located at the bottom of the spray tower body, used to collect the liquid filtered by the filter plate 16, and simultaneously provides condensate to the condensate pipe 11, realizing water resource circulation. When the water temperature in the hot water tank 14 reaches the expected temperature, the water in the hot water tank 14 can be pumped out of the spray tower body 1 for use by the pump 15.

[0024] The inner wall of the spray tower body 1 is equipped with a mounting bracket, and the primary waste heat recovery box 2 is mounted on the mounting bracket. The primary waste heat recovery box 2 is made of a material with good thermal conductivity. The air inlet pipe 21 on the primary waste heat recovery box 2 is made of a high-temperature resistant and corrosion-resistant material and is used to connect the waste gas to be treated. The air outlet pipe 22 is made of the same material as the air inlet pipe 21 and connects the primary waste heat recovery box 2 and the internal space of the spray tower body 1, transporting the waste gas passing through the primary waste heat recovery box to the spraying area of ​​the spray tower body 1. The primary heat exchange pipe 23 is located inside the primary waste heat recovery box 2 and is made of a high thermal conductivity material. The waste gas flows inside the pipe, and the outside of the pipe is the heat exchange medium. Heat exchange between the waste gas and the heat exchange medium is achieved through the pipe wall. In this embodiment, the heat exchange medium is low-temperature water.

[0025] The secondary waste heat recovery box 3 is connected to the outlet of the spray tower 1 via a connecting gas pipe 33, and is used to recover waste heat from the waste gas treated by the spray tower 1. The connecting gas pipe 33 is used to transport the waste gas treated by the spray tower 1 to the secondary waste heat recovery box 3. The gas chamber 31 is connected to the connecting gas pipe 33, receives the waste gas from the spray tower 1, and exchanges heat with the liquid chamber 32 through heat conduction to further recover the waste heat in the waste gas. At the same time, the waste gas is introduced into the secondary heat exchange pipe 37. The liquid chamber 32 is filled with a heat exchange medium to provide a heat exchange environment for the secondary heat exchange pipe 37.

[0026] Specifically, the waste gas to be treated enters the primary heat exchange tube 23 inside the primary waste heat recovery box 2 through the inlet pipe 21. Inside the primary waste heat recovery box 2, the heat exchange medium outside the primary heat exchange tube 23 exchanges heat with the waste gas inside the tube, completing the first waste heat recovery. After the waste gas temperature decreases, it enters the spray tower body 1 through the outlet pipe 22. In the spray tower body 1, the condensate pipe 11 delivers water from an external water source to the spray head 12. The mist water sprayed from the spray head 12 comes into contact with the waste gas, undergoes heat exchange, and simultaneously adsorbs some impurities. The impurities in the waste gas and the sprayed water fall onto the filter plate 16. After being filtered and purified by the filter plate 16, the water flows into the hot water tank 14 under the guidance of the diversion funnel 13. The water in the hot water tank 14 can be transported back to the spray head 12 through the condensate pipe 11, realizing water circulation while also absorbing heat from the waste gas again, increasing the water temperature inside the hot water tank 14. The waste gas treated by spraying enters the gas chamber 31 of the secondary waste heat recovery box 3 through the gas outlet of the spray tower 1 and the connecting gas pipe 33. It undergoes a third heat exchange with the heat exchange medium in the liquid chamber 32, and finally the waste gas is discharged from the exhaust port 36.

[0027] Compared with existing technologies, this embodiment performs three-stage waste heat recovery of exhaust gas by setting up a primary waste heat recovery box 2, a secondary waste heat recovery box 3, and a hot water tank 14. Compared with the traditional single recovery method, it greatly improves the waste heat recovery efficiency and can make full use of the heat energy in the exhaust gas. The sprayed water is filtered by the filter plate 16 and collected by the diversion funnel 13 before entering the hot water tank 14 and reused for spraying, reducing the amount of fresh water used and reducing water consumption. The primary waste heat recovery box 2 is integrated inside the spray tower body 1, and the secondary waste heat recovery box 3 is connected to the spray tower body 1 through the connecting gas pipe 33. The overall structure is compact and reduces the equipment footprint.

[0028] Please see Figure 1 In this embodiment, the hot water tank 14 is equipped with a water outlet pipe, which is connected to the water inlet of the pump 15. The pump 15 has multiple water outlets, one of which is connected to the condensate pipe 11. The water outlet pipe of the hot water tank 14 is located at the bottom of one side of the hot water tank 14 and is connected to the water inlet of the pump 15 via a pipe. One of the water outlets on the pump 15 is connected to the condensate pipe 11 to pump water from the hot water tank 14 into the condensate pipe 11 for spraying waste gas. After heat exchange with the waste gas, the water flowing back into the hot water tank 14 has a higher temperature than the original water temperature. This achieves water circulation and also increases the water temperature in the hot water tank 14 to meet the demand. The other water outlet on the pump 15 is connected to a pipe outside the spray tower 1 to extract water from the hot water tank 14 that has reached the preset water temperature for use.

[0029] Please see Figure 1In this embodiment, an electromagnetic valve 131 is installed at the outlet of the diversion funnel 13, and a sensor is installed inside the hot water tank 14. The electromagnetic valve 131, the sensor, and the pump 15 are all electrically connected to a controller located outside the spray tower body 1. The electromagnetic valve 131 is a valve installed at the outlet of the diversion funnel 13. The opening and closing of the valve is controlled electromagnetically, thereby controlling the water supply from the diversion funnel 13 to the hot water tank 14. The sensors include a water level sensor and a temperature sensor, both installed inside the hot water tank 14. They can detect changes in water level and temperature in the hot water tank 14 in real time and transmit the detection data to the controller. The controller is installed outside the spray tower body 1, receives signals from the sensors, and controls the operation of the electromagnetic valve 131 and the pump 15 according to a preset program. The preset program within the controller can be modified according to actual needs. Specifically, the sensor detects parameters such as water level and temperature in the hot water tank 14 in real time and sends the signals to the controller. When the water level and temperature in the hot water tank 14 are both lower than the preset values, the controller controls the solenoid valve 131 to open, and the water in the funnel 13 flows into the hot water tank 14. When the water level reaches the preset value but the water temperature is lower than the preset value, the water supply source outside the spray tower 1 stops supplying water to the condensate pipe 11, and the pump 15 operates to transport the water in the hot water tank 14 to the condensate pipe 11 for spraying the exhaust gas. At this time, the solenoid valve 131 is in the open state, and the sprayed water flows back into the hot water tank 14 after being processed by the filter plate 16. When the water level and temperature both reach the preset values, the controller controls the solenoid valve 131 to close. At this time, the water supply source outside the spray tower 1 supplies water to the condensate pipe 11, and the pump 15 draws the hot water in the hot water tank 14 to the outside of the spray tower 1 for use. When all the hot water in the hot water tank 14 has been drawn out, the controller controls the solenoid valve 131 to open, and the sprayed water flows into the hot water tank 14. Through the linkage of sensors, controllers, solenoid valves 131, and pumps 15, water level control and water temperature regulation can be achieved without manual operation, reducing the intensity of manual labor, accurately controlling water volume according to actual needs, avoiding water waste, and also achieving the best state of waste heat recovery and exhaust gas treatment.

[0030] In this embodiment, the spray tower body 1 is provided with an inspection door, which is located at the lower part of the spray tower body 1. The inspection door is a door structure located at the lower part of the spray tower body 1, with a sealing device on the edge. When closed, it can ensure the airtightness of the spray tower body 1, and when opened, it allows maintenance personnel to enter.

[0031] Please see Figure 1In this embodiment, there are multiple primary waste heat recovery boxes 2, which are evenly arranged inside the spray tower body 1. Each primary waste heat recovery box 2 is equipped with a primary water inlet pipe 24 and a primary water outlet pipe 25. The number of primary waste heat recovery boxes can be determined according to the size of the spray tower body 1 and the amount of waste gas to be treated. The multiple primary waste heat recovery boxes 2 evenly distributed inside the spray tower body 1 can simultaneously recover waste heat from the waste gas, thereby improving the waste heat recovery efficiency. The primary water inlet pipe 24 is connected to an external water supply source for the spray tower body 1, and the primary water outlet pipe 25 discharges the water that has undergone heat exchange in the primary waste heat recovery box 2 for use. Specifically, low-temperature water from the external water supply source enters the primary waste heat recovery box 2 through the water inlet pipe, exchanges heat with the primary heat exchange pipe 23 to raise the water temperature, and then discharges it to the outside of the spray tower body 1 through the water outlet pipe for use. At the same time, placing the primary waste heat recovery boxes 2 inside the spray tower body 1 not only reduces the floor space occupied but also allows for better recovery of waste heat from the waste gas. Multiple primary waste heat recovery boxes 2 are evenly distributed within the spray tower body 1. The waste gas to be treated enters the primary heat exchange pipe 23 of each primary waste heat recovery box 2 through the corresponding air inlet pipe 21. The external heat exchange medium enters each primary waste heat recovery box 2 through the primary water inlet pipe 24, and exchanges heat with the waste gas in the primary heat exchange pipe 23. The medium that has absorbed heat is discharged through the primary water outlet pipe 25 for subsequent use. Multiple primary waste heat recovery boxes 2 operate simultaneously, which can treat more waste gas and improve waste heat recovery efficiency.

[0032] Please see Figure 1 In this embodiment, the secondary waste heat recovery box 3 is provided with a secondary water inlet pipe 34 at the bottom and a secondary water outlet pipe 35 at the top. Low-temperature water enters through the secondary water inlet pipe 34, exchanges heat with the waste gas to raise the water temperature, and then exits through the secondary water outlet pipe 35. The liquid chamber 32 is provided with multiple secondary heat exchange pipes 37, one end of which is connected to the gas chamber 31, and the other end is connected to the exhaust port 36 of the secondary waste heat recovery box 3. Specifically, the external heat exchange medium enters the liquid chamber 32 from the bottom of the secondary waste heat recovery box 3 through the secondary water inlet pipe 34. The waste gas entering from the gas chamber 31 flows into the multiple secondary heat exchange pipes 37 respectively. In the liquid chamber 32, the waste gas in the secondary heat exchange pipes 37 exchanges heat with the heat exchange medium outside the pipes, further reducing the temperature of the waste gas, and then exits through the exhaust port 36. After absorbing heat, the heat exchange medium exits through the secondary water outlet pipe 35 at the top, realizing the recovery and utilization of heat. Multiple secondary heat exchange tubes 37 increase the contact area between the exhaust gas and the heat exchange medium, making the heat exchange more complete.

[0033] In this embodiment, the filter plate 16 has a first activated carbon adsorption layer inside, a filter cotton at the bottom of the first activated carbon adsorption layer, and a second activated carbon adsorption layer at the bottom of the filter cotton. Both the first and second activated carbon adsorption layers are composed of activated carbon particles, which can adsorb organic impurities and odors in the water. The filter cotton is located between the first and second activated carbon adsorption layers and has a fine porous structure, which can filter out fine particulate impurities in the water. Specifically, when the sprayed water falls onto the filter plate 16, the first activated carbon adsorption layer uses its porous structure to adsorb organic impurities and odors in the water; water containing fine particulate impurities permeates into the filter cotton, and the fine pores of the filter cotton intercept and filter the fine particles; the water and impurities that have not been completely adsorbed by the filter cotton reach the second activated carbon adsorption layer, where the second activated carbon adsorption layer adsorbs the remaining impurities and odors again, making the filtered water cleaner.

[0034] Compared with existing technologies, this utility model performs three-stage waste heat recovery on waste gas by setting up a primary waste heat recovery box 2, a secondary waste heat recovery box 3, and a hot water box 14. Compared with the traditional single waste heat recovery method, it significantly improves the waste heat recovery efficiency and can make full use of the heat energy in the waste gas. The sprayed water is filtered by the filter plate 16 and collected by the diversion funnel 13 before entering the hot water box 14 for reuse in spraying, reducing the amount of fresh water used and reducing water consumption. The primary waste heat recovery box 2 is integrated inside the spray tower body 1, and the secondary waste heat recovery box 3 is connected to the spray tower body 1 through the connecting gas pipe 33. The overall structure is compact and reduces the equipment footprint. At the same time, after the waste heat of the waste gas is recovered, hot water at three different temperatures can be obtained sequentially from the primary waste heat recovery box 2, the hot water box 14, and the secondary waste heat recovery box 3 for use.

[0035] The above description is only a part of the embodiments of this utility model, and does not limit the scope of protection of this utility model. Any equivalent device or equivalent process transformation made based on the content of this utility model specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this utility model.

Claims

1. A high-efficiency waste heat recovery spray tower, characterized in that, include: The spray tower body includes a support frame with a condensate pipe movably connected to it. A spray head is connected to the condensate pipe. The spray tower body also includes a filter plate with a drainage funnel below it. A hot water tank is located on the bottom wall of the spray tower body, with the top of the hot water tank connected to the outlet of the drainage funnel. The condensate pipe is connected to the hot water tank. A primary waste heat recovery box is installed inside the spray tower body and above the filter plate. An air inlet pipe is provided on one side of the primary waste heat recovery box, and one end of the air inlet pipe penetrates the side wall of the spray tower body. An air outlet pipe is provided on the other side of the primary waste heat recovery box. A primary heat exchange pipe is provided inside the primary waste heat recovery box, and the two ends of the primary heat exchange pipe are respectively connected to the air inlet pipe and the air outlet pipe. A secondary waste heat recovery box is provided, which is connected to the air outlet of the spray tower body via a connecting air pipe. The secondary waste heat recovery box is provided with an air chamber and a liquid chamber, and the air chamber is connected to the connecting air pipe.

2. The high-efficiency waste heat recovery spray tower according to claim 1, characterized in that, The hot water tank is equipped with a water outlet pipe, which is connected to the water inlet of the pump. The pump has multiple water outlets, one of which is connected to the condensate pipe.

3. The high-efficiency waste heat recovery spray tower according to claim 2, characterized in that, An electromagnetic valve is installed at the outlet of the diversion funnel, and a sensor is installed inside the hot water tank. The electromagnetic valve, the sensor, and the pump are all electrically connected to a controller located outside the spray tower.

4. The high-efficiency waste heat recovery spray tower according to claim 1, characterized in that, The spray tower body is equipped with an inspection door, which is located at the lower part of the spray tower body.

5. A high-efficiency waste heat recovery spray tower according to claim 1, characterized in that, There are multiple primary waste heat recovery boxes, which are evenly arranged inside the spray tower. Each primary waste heat recovery box is equipped with a primary water inlet pipe and a primary water outlet pipe.

6. The high-efficiency waste heat recovery spray tower according to claim 1, characterized in that, The secondary waste heat recovery box is equipped with a secondary water inlet pipe at the bottom and a secondary water outlet pipe at the top.

7. The high-efficiency waste heat recovery spray tower according to claim 1, characterized in that, The liquid chamber is equipped with multiple secondary heat exchange tubes, one end of which is connected to the gas chamber and the other end is connected to the exhaust port of the secondary waste heat recovery box.

8. The high-efficiency waste heat recovery spray tower according to claim 1, characterized in that, The filter plate has a first activated carbon adsorption layer inside, a filter cotton is provided at the bottom of the first activated carbon adsorption layer, and a second activated carbon adsorption layer is provided at the bottom of the filter cotton.

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