Recycling and recycling system for kiln cooling waste heat

Abstract

The utility model discloses a recycling system for kiln cooling waste heat, and belongs to the technical field of kiln cooling energy conservation and environmental protection. One end of the first cold air distribution pipe is connected with a tail cooling area, and the first cold air distribution pipe is provided with a tail cooling air supply fan used for leading in cold air; the heat inlet main pipe is connected with a plurality of tail cooling draught hoods, the multiple tail cooling draught hoods are connected to the tail cooling area, and the heat inlet main pipe is used for extracting tail cooling tail gas in the tail cooling area; one end of the first circulating pipe is connected with the tail cooling draught hood, and the other end is connected to the first cold air distribution pipe. Tail cooling tail gas generated in the tail cooling area is mixed with cold air supplied by the first cold air distribution pipe for temperature regulation and then returns to the tail cooling area to cool the green bricks instead of the cold air, and the temperature of inlet air entering the tail cooling area is increased, so that the difference value between the product and the inlet air temperature is reduced, and the green brick product is small in shrinkage amplitude and smooth in cooling; and the conditions of internal stress deformation and even direct cracking caused by rapid shrinkage of a green brick product are reduced.

Description

Technical Field

[0001] This utility model relates to the field of kiln cooling energy-saving and environmental protection technology, and in particular to a kiln cooling waste heat recycling system. Background Technology

[0002] After ceramic products are fired in the kiln, they undergo rapid cooling in a quenching zone (where the liquid phase within the blank counteracts the stress generated by shrinkage), slow cooling in a deceleration zone (to prevent excessively rapid volume changes and cracking during the silicon dioxide crystal transformation), and final cooling in a tail cooling zone until they are unloaded from the kiln. Currently, the cooling air in the tail cooling zone is directly supplied by natural air from the workshop. When cooling some temperature-sensitive products, the large temperature difference between the product and the incoming air can easily cause these products to shrink rapidly, leading to internal stress and deformation or even cracking. Utility Model Content

[0003] The purpose of this utility model is to provide a recycling system for waste heat from kiln cooling, in order to solve one or more technical problems existing in the prior art, or at least provide a beneficial option or create conditions.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows: a kiln cooling waste heat recycling system, comprising: a tail cooling zone; a first cooling air duct, one end of which is connected to the tail cooling zone, the first cooling air duct being equipped with a tail cooling air supply fan for introducing cold air; a heat inlet main pipe, connected to a plurality of tail cooling exhaust hoods, the plurality of tail cooling exhaust hoods being respectively connected to the tail cooling zone, the heat inlet main pipe being used to extract tail cooling exhaust gas in the tail cooling zone; and a first circulation pipe, one end of which is connected to the tail cooling exhaust hood, the other end of which is connected to the first cooling air duct.

[0005] The technical solution has at least the following beneficial effects: the tail cooling exhaust gas generated in the tail cooling zone is mixed and conditioned with the cold air supplied by the first cooling air duct, and then returns to the tail cooling zone to cool the brick blank. Since the inlet air temperature in the tail cooling zone is increased, the temperature difference between the product and the inlet air is reduced, the shrinkage of the brick blank is smaller, and the cooling is more gradual, so as to reduce the situation where the brick blank shrinks rapidly and causes internal stress deformation or even direct cracking.

[0006] As a further improvement to the above technical solution, a slow cooling zone connected to the tail cooling zone is also included. The tail cooling zone includes a low-temperature section away from the slow cooling zone. The first circulation pipe is connected to the tail cooling exhaust hood in the low-temperature section. The main heat inlet pipe is equipped with a first valve, which is used to control the amount of low-temperature tail cooling exhaust gas generated in the low-temperature section discharged into the main heat inlet pipe. As the product moves sequentially from the slow cooling zone to the tail cooling zone, the temperature continuously decreases, making the temperature of the low-temperature section lower. The tail cooling exhaust gas in the low-temperature section is then recirculated back into the tail cooling zone to ensure the cooling effect of the tail cooling zone, thereby balancing the difference between the product temperature and the inlet air temperature, as well as the cooling effect.

[0007] As a further improvement to the above technical solution, a slow cooling zone connected to the tail cooling zone is also included. This slow cooling zone is equipped with multiple heat exchange tubes. The main heat inlet pipe is connected to a first waste heat pipe. One end of each of the multiple heat exchange tubes is connected to the first waste heat pipe, and the other end of each heat exchange tube is connected to a waste heat branch pipe. These multiple waste heat branch pipes are collectively connected to a main heat extraction pipe, which is connected to the main waste heat pipe. A heat extraction fan is installed on the main waste heat pipe to extract the gas from the heat exchange tubes to the main waste heat pipe. The tail cooling exhaust gas from the tail cooling zone is introduced into the heat exchange tubes through the first waste heat pipe for use in slow cooling of the products in the slow cooling zone, thereby fully utilizing the tail cooling exhaust gas from the tail cooling zone.

[0008] As a further improvement to the above technical solution, the first waste heat pipe is connected to a second cold air pipe, and the second cold air pipe is equipped with a second valve to control the flow rate of cold air in the second cold air pipe. A third valve is installed on the first waste heat pipe between the second cold air pipe and the main heat inlet pipe, and the third valve is used to control the flow rate of tail-cooled exhaust gas in the first waste heat pipe. Adjusting the second and third valves according to the cooling status of the products in the slow cooling zone ensures the cooling effect of the products in the slow cooling zone.

[0009] As a further improvement to the above technical solution, the tail cooling zone includes a high-temperature section near the slow cooling zone. The inlet heat pipe of the high-temperature section is connected to the extraction heat pipe. A fourth valve is installed between the inlet heat pipe and the extraction heat pipe. The fourth valve is used to control the flow rate of the high-temperature tail cooling exhaust gas from the high-temperature section into the extraction heat pipe. A fifth valve is installed on the inlet heat pipe. The fifth valve is used to control the amount of high-temperature tail cooling exhaust gas from the high-temperature section discharged into the inlet heat pipe. By adjusting the opening of the fourth and fifth valves, the amount of high-temperature tail cooling exhaust gas from the high-temperature section introduced into the heat exchange tube and directly introduced into the extraction heat pipe can be adjusted, thereby further adjusting the temperature of the heat exchange tube.

[0010] As a further improvement to the above technical solution, the slow cooling zone includes a superheated section located away from the tail cooling zone. A sixth valve is installed on the main heat extraction pipe. This sixth valve controls the amount of high-temperature slow-cooling tail gas generated in the superheated section discharged into the main heat extraction pipe. By adjusting the sixth valve, the gas flow rate in the heat exchange tubes of the superheated section can be controlled, thereby regulating the slow cooling temperature of the superheated section.

[0011] As a further improvement to the above technical solution, a first temperature sensor is also included. This first temperature sensor detects a first temperature value near the tail cooling zone in the superheated section. When the first temperature value reaches a second preset value, the opening of the sixth valve increases. The sixth valve can be adjusted based on feedback from the first temperature sensor, thereby better controlling the slow cooling temperature of the superheated section.

[0012] As a further improvement to the above technical solution, the slow cooling zone is connected to a slow cooling exhaust hood, the other end of which is connected to the main heat extraction pipe. The slow cooling exhaust hood is equipped with a seventh valve, which controls the flow rate of the exhaust hood. By extracting the slow cooling exhaust gas from the slow cooling zone through the exhaust hood, the product is cooled while maintaining a relatively stable pressure inside the kiln.

[0013] As a further improvement to the above technical solution, a third cold air duct is connected between the waste heat main pipe and the exhaust fan. The third cold air duct is equipped with an eighth valve to control the flow rate of cold air within it. A second temperature sensor is installed in the waste heat main pipe to detect a second temperature value of the gas inside. When the second temperature value reaches a third preset value, the opening of the eighth valve increases. The third preset value can be set according to the temperature tolerance of the exhaust fan, and the amount of cold air introduced through the third cold air duct can be adjusted based on the temperature detected by the second temperature sensor to regulate the temperature of the gas passing through the exhaust fan, thus preventing damage to the exhaust fan due to excessively high gas temperature and protecting the exhaust fan.

[0014] As a further improvement to the above technical solution, a drying kiln is also included, wherein the waste heat main pipe is connected to the drying air inlet of the drying kiln, and the waste heat main pipe can supply gas to the drying kiln. This allows for the full recovery and utilization of the collected gas waste heat, achieving environmental protection and energy-saving effects. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the tail cooling zone in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the slow cooling zone in an embodiment of the present invention.

[0019] 100. Slow Cooling Zone; 110. First Section; 120. Second Section; 130. Third Section; 140. Slow Cooling Exhaust Hood; 150. Seventh Valve; 160. Superheated Section; 200. Tail Cooling Zone; 210. Low Temperature Section; 211. First Circulation Pipe; 220. High Temperature Section; 222. Fourth Valve; 223. Pressure Sensor; 310. First Cooling Air Duct; 311. Tail Cooling Air Supply Fan; 312. Ninth Valve; 313. Third Temperature Sensor; 320. Second Cooling Air Duct; 321. 330. Second valve; 331. Third cold air duct; 400. Eighth valve; 401. Main heat inlet pipe; 402. First valve; 403. Fifth valve; 410. Tail-end cold exhaust hood; 420. First waste heat pipe; 421. Third valve; 500. Heat exchange pipe; 600. Main heat extraction pipe; 601. Sixth valve; 602. First temperature sensor; 610. Waste heat distribution pipe; 620. Main waste heat pipe; 621. Second temperature sensor; 630. Heat extraction fan; 700. Third waste heat pipe. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0022] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] Reference Figure 1-3 After the process of producing porcelain products in the kiln, a firing kiln and a drying kiln are needed. The firing kiln includes a firing zone, a rapid cooling zone, a slow cooling zone 100 and a tail cooling zone 200 connected in sequence.

[0025] The product is conveyed by rollers and, after high-temperature sintering, passes through a rapid cooling zone and then enters a slow cooling zone 100 and a tail cooling zone 200 to complete the cooling process of the ceramic product. Understandably, as the product is continuously conveyed, its temperature gradually decreases after passing through the slow cooling zone 100 and the tail cooling zone 200 until the preset cooling effect is achieved.

[0026] The waste heat recovery system for kiln cooling includes a first cooling air duct 310, a main heat inlet duct 400, a tail cooling exhaust hood 410, a first waste heat duct 420, a longitudinally arranged heat exchange duct 500, a main heat extraction duct 600, a waste heat distribution duct 610, and a waste heat main duct 620.

[0027] One end of the first cooling air duct 310 forms multiple branch pipes, which are respectively connected to the tail cooling zone 200. Each branch pipe is equipped with a control valve to adjust its opening. The first cooling air duct 310 is equipped with a tail cooling fan 311. The tail cooling zone 200 is connected to multiple tail cooling exhaust hoods 410 for discharging tail cooling exhaust gas. The tail cooling exhaust hoods 410 are equipped with control valves to adjust their opening. The ends of the multiple tail cooling exhaust hoods 410 away from the tail cooling zone 200 are sequentially connected to the main heat inlet pipe 400, thereby collecting the tail cooling exhaust gas from the tail cooling zone 200 into the main heat inlet pipe 400.

[0028] The tail cooling zone 200 is divided into three areas: a low temperature zone 210, a medium temperature zone, and a high temperature zone 220. The low temperature zone is located furthest from the slow cooling zone 100, while the high temperature zone 220 is located closest to the slow cooling zone 100. It can be understood that the product passes through the high temperature zone 220, the medium temperature zone, and the low temperature zone 210 in sequence during the cooling process.

[0029] The tail-cooling exhaust hood 410 connected to the low-temperature section 210 is connected to a first circulation pipe 211. The end of the first circulation pipe 211 away from the low-temperature section 210 is connected to the first cooling air duct 310 near the air inlet. The main heat inlet pipe 400 is equipped with a first valve 401. The opening degree of the first valve 401 can regulate the amount of low-temperature tail-cooling exhaust gas generated by the low-temperature section 210 discharged into the main heat inlet pipe 400.

[0030] When the first valve 401 is closed, the low-temperature tail cooling exhaust gas generated in the low-temperature section 210 is introduced into the first cooling air distribution pipe 310 through the first circulation pipe 211. After mixing with a certain amount of cold air, it can be recycled back to each tail cooling zone 200. The inlet air temperature of the tail cooling zone 200 is increased to a certain extent, thereby reducing the difference between the inlet air temperature and the product temperature. This results in a smaller shrinkage of the brick blank and a smoother cooling process, reducing the possibility of rapid shrinkage of the brick blank leading to internal stress deformation or even direct cracking.

[0031] Furthermore, a heat exchange tube 500 is installed inside the slow cooling zone 100. One end of the first waste heat tube 420 is connected to the main heat inlet pipe 400, and the other end forms multiple branch pipes, each connected to one end of a heat exchange tube 500. The other ends of the multiple heat exchange tubes 500 are each connected to a waste heat branch pipe 610, which are sequentially connected to the main heat extraction pipe 600. One end of the waste heat main pipe 620 is connected to the main heat extraction pipe 600, and the other end is connected to the drying air inlet of the drying kiln. The main heat inlet pipe 400 and the first waste heat tube 420 are different sections of the same pipe.

[0032] The high-temperature section 220 has a main heat inlet pipe 400 connected to a main heat extraction pipe 600. A fourth valve 222 is installed between the main heat inlet pipe 400 and the main heat extraction pipe 600. A fifth valve 402 is installed on the main heat inlet pipe 400. In addition to extending to the slow cooling zone and then to the inlet of the heat extraction fan, a portion of the hot air from the main heat inlet pipe 400 enters the first waste heat pipe 420 and then the heat exchange pipe 500. This utilizes the tail-cooled exhaust gas to gently cool the brick blanks inside the slow cooling zone 100, while simultaneously significantly increasing the temperature of the recovered hot air.

[0033] The waste heat main pipe 620 is equipped with a heat extraction fan 630. The inlet of the heat extraction fan 630 is connected to the heat extraction main pipe 600, and its outlet is connected to the waste heat main pipe 620. The slow cooling zone 100 is connected to a slow cooling exhaust hood 140. The end of the slow cooling exhaust hood 140 away from the slow cooling zone 100 is connected to the heat extraction main pipe 600. The slow cooling exhaust hood 140 is equipped with a seventh valve 150, which is used to control the flow rate of the slow cooling exhaust hood. The tail-cooling exhaust hood 410 and the slow-cooling exhaust hood 140 respectively draw the hot air from the tail-cooling zone and the slow-cooling zone to the heat extraction main pipe 600. The heat exchange exhaust gas discharged from the heat exchange tube 500 reaches the heat extraction main pipe 600 through the waste heat distribution pipe 610. After mixing, the hot air temperature of the heat extraction main pipe 600 is further increased. The hot air is then sent to the outlet waste heat main pipe 620 by the heat extraction fan 630. Part of the hot air in the waste heat main pipe 620 is sent to the drying billet, and the other part is sent to the quenching zone for heat exchange. After the temperature is increased, it is sent to the kiln burner for combustion.

[0034] Furthermore, by controlling the opening degree of the fifth valve 402, the amount of high-temperature tail-cooled exhaust gas generated in the high-temperature section 220 discharged into the main heat inlet pipe 400 can be adjusted. Therefore, by adjusting the opening degrees of the fourth valve 222 and the fifth valve 402, the ratio of the high-temperature tail-cooled exhaust gas generated in the high-temperature section 220 entering the main heat inlet pipe 400 and directly entering the main heat extraction pipe 600 can be controlled, thereby ensuring that the temperature of the tail-cooled exhaust gas entering the first waste heat pipe 420 is not too high.

[0035] To ensure the smooth extraction of heat exchange exhaust gas, a standby fan is installed in the waste heat main pipe 620, connected in parallel with the heat extraction fan 630. The standby fan is associated with the heat extraction fan 630. When the heat extraction fan 630 malfunctions or is damaged and stops operating, the standby fan is activated to provide airflow power, thereby ensuring the smooth operation of the system.

[0036] A ninth valve 312 is installed on the first cooling air duct 310, and a third temperature sensor 313 is installed at the end of the first cooling air duct 310 near the main heat inlet duct 400. The opening of the ninth valve 312 is adjusted according to the temperature of the third temperature sensor 313 to regulate the temperature of the cold air entering the tail cooling zone 200, thereby ensuring the cooling effect of the tail cooling zone 200. The operation of adjusting the opening of the ninth valve 312 according to the temperature of the third temperature sensor 313 can be performed manually or by setting a certain communication connection between the third temperature sensor 313 and the ninth valve 312. When the cooling temperature of the low-temperature section 210 is too high, the first valve 401 is opened to introduce the high-temperature tail cooling exhaust gas into the main heat inlet duct 400, and then into the heat exchange tube 500 through the first waste heat pipe 420 for utilization.

[0037] Furthermore, the first waste heat pipe 420 is connected to a second cold air pipe 320. The second cold air pipe 320 is equipped with a second valve 321, and the first waste heat pipe 420 is equipped with a third valve 421. The third valve 421 is located between the second cold air pipe 320 and the main heat inlet pipe 400. By adjusting the opening of the second valve 321 and the third valve 421, natural or artificial cold air can be introduced from the second cold air pipe 320 into the first waste heat pipe 420, thereby regulating the mixing ratio of cold air and exhaust gas, and thus regulating the temperature of the mixed gas entering the heat exchange pipe 500, ensuring the cooling effect within the slow cooling zone 100.

[0038] Furthermore, a pressure sensor 223 is installed in the slow cooling zone 100 at the position furthest from the tail cooling zone 200. The pressure sensor 223 can detect the pressure within the slow cooling zone 100. When the pressure detected by the pressure sensor 223 in the slow cooling zone 100 exceeds a preset first value, the opening of the fourth valve 222 is increased. When the opening of the fourth valve 222 increases, more tail cooling exhaust gas generated in the high-temperature section 220 is discharged, thereby reducing the pressure within the high-temperature section 220. Since there is a certain degree of connectivity between the slow cooling zone 100 and the tail cooling zone 200, the pressure within the slow cooling zone 100 can be alleviated, preventing the pressure within the slow cooling zone 100 from becoming too high.

[0039] Furthermore, a superheated section 160 is set within the slow cooling zone 100, and the superheated section 160 is located at the position furthest from the tail cooling zone 200.

[0040] The main heat extraction pipe 600 is equipped with a sixth valve 601. A first temperature sensor 602 is installed in the superheated section 160, closest to the tail cooling zone 200. When the first temperature sensor 602 reaches a preset second value, the opening of the sixth valve is increased.

[0041] When the temperature at the location closest to the tail cooling zone 200 in the superheated section 160 is too high, the opening of the sixth valve 601 can be increased to increase the flow rate of gas flowing through the heat exchange tube 500 in the superheated section 160, thereby improving the cooling effect of the heat exchange tube 500 and controlling the temperature in the slow cooling zone 100 within the required range. The operation of adjusting the opening of the sixth valve 601 based on the temperature of the first temperature sensor 602 can be performed manually or by establishing a communication connection between the first temperature sensor 602 and the sixth valve 601.

[0042] The slow cooling zone 100 is divided into three sections along the product movement direction: a first section 110, a second section 120, and a third section 130. The density of the slow cooling exhaust hoods 140 connected to the third section 130 is greater than that connected to the second section 120, and the density of the slow cooling exhaust hoods 140 connected to the second section 120 is greater than that connected to the first section 110. By gradually increasing the density of exhaust hoods, hot air is extracted from the slow cooling zone 100, thereby cooling the product within its tolerance range and ensuring that the product quality is not affected by the cooling process.

[0043] Furthermore, the waste heat main pipe 620 is connected to a third cold air duct 330, which is located between the exhaust fan 630 and the waste heat main pipe 600. An eighth valve 331 is installed in the third cold air duct 330. A second temperature sensor 621 is installed inside the waste heat main pipe 620. When the temperature detected by the second temperature sensor 621 reaches a preset third value, it means that the temperature inside the waste heat main pipe 620 is too high. Excessive temperature can easily damage the exhaust fan 630. Therefore, increasing the opening of the eighth valve 331 at this time allows a certain amount of natural or artificial cold air to be introduced into the waste heat main pipe 620, thereby protecting the exhaust fan 630.

[0044] The operation of adjusting the opening of the eighth valve 331 based on the temperature of the second temperature sensor 621 can be performed manually or by setting a certain communication connection between the second temperature sensor 621 and the eighth valve 331.

[0045] Furthermore, the waste heat main pipe 620 is also connected to a third waste heat pipe 700, which is located between the exhaust fan 630 and the drying air inlet of the drying kiln. The end of the third waste heat pipe 700 away from the waste heat main pipe 620 is connected to the firing zone of the firing kiln, so that the waste heat exhaust gas in the third waste heat pipe 700 can be reused as combustion air.

[0046] In summary, the kiln cooling waste heat recycling system of this application recirculates a portion of the tail-cooling exhaust gas extracted by the tail-cooling exhaust hood 410 back into the tail-cooling zone for cooling. This increases the inlet air temperature in the tail-cooling zone, reduces the difference between the product temperature and the inlet air temperature, and prevents excessively cold air from blowing onto the billet, causing stress, deformation, or cracking. This achieves gentle cooling of the product and ensures product quality. When the cold air temperature is too high, resulting in poor cooling of the billet, an appropriate amount of cold air can be added through the first cooling air distribution pipe 310 to adjust the inlet air temperature, balancing the cooling effect and product quality.

[0047] Another portion of the tail-cooling exhaust gas extracted by the tail-cooling exhaust hood 410 enters the heat exchange tube 500 through the first waste heat pipe 420 via the inlet heat pipe 400. Similarly, hot air is used to transfer heat to the billet in the slow cooling zone inside the kiln through the pipe wall of the heat exchange tube 500 in order to prevent the billet from developing cold crack defects due to a large temperature gradient.

[0048] Part of the hot air from the tail cooling zone is drawn into the main heat extraction pipe 600 via the tail cooling exhaust hood 410, the hot air from the slow cooling zone via the slow cooling exhaust hood 140, and the hot air from the heat exchange tube 500 via the waste heat distribution pipe 610. The hot air is then extracted by the heat extraction fan 630, with its outlet at the waste heat main pipe 620. Part of the recovered hot air is sent to combustion support, and the other part is sent to dry the billet. While the billet is being slowly cooled, the energy generated from the slow cooling process can be recovered, achieving energy conservation. Since there is no external exhaust of hot air, thermal pollution to the environment is also reduced, achieving environmental protection.

[0049] A first temperature sensor 602 is installed in the slow cooling zone. When the actual temperature detected in the kiln in this zone exceeds the set value, the sixth valve 601 on the heat extraction main pipe 600 increases the air volume to cool down the kiln and maintain the actual temperature at the set value.

[0050] A pressure sensor 223, or kiln pressure sensor, is installed in the slow cooling zone. When the actual pressure detected in this zone exceeds the set value, the fourth valve 222 is opened to reduce the kiln pressure. After the fourth valve 222 is opened, the hot air in the tail cooling zone is discharged through the tail cooling exhaust hood 410 and the hot air blower 630. Conversely, the kiln pressure can be increased by opening the fourth valve 222.

[0051] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A system for recycling and reusing the waste heat of a kiln, characterized by, The application relates to a cooling device, which comprises: a tail cooling area; a first cold air distribution pipe, one end of which is connected to the tail cooling area, and a tail cooling air supply fan is arranged in the first cold air distribution pipe for guiding cold air into the tail cooling area; a heat inlet main pipe, which is connected with a plurality of tail cooling air exhaust hoods, the tail cooling air exhaust hoods are respectively connected to the tail cooling area, and the heat inlet main pipe is used for extracting tail cooling exhaust gas in the tail cooling area; a first circulation pipe, one end of which is connected to the tail cooling air exhaust hood, and the other end of which is connected to the first cold air distribution pipe.

2. The system for recycling and reusing the waste heat of a kiln according to claim 1, characterized in that: The tail cooling area is further connected with a slow cooling area, the tail cooling area comprises a low-temperature section far away from the slow cooling area, the first circulation pipe is connected to the tail cooling air exhaust hood of the low-temperature section, the heat inlet main pipe is provided with a first valve, and the first valve is used for controlling the amount of low-temperature tail cooling exhaust gas generated by the low-temperature section and discharged into the heat inlet main pipe.

3. The system for recycling and reusing the waste heat of a kiln according to claim 1, characterized in that: The tail cooling area is further connected with a slow cooling area, a plurality of heat exchange pipes are arranged in the slow cooling area, the heat inlet main pipe is connected with a first waste heat pipe, one end of the heat exchange pipes is respectively connected to the first waste heat pipe, the other end of the heat exchange pipes is connected with waste heat branch pipes, the waste heat branch pipes are collectively connected with a heat extraction main pipe, the heat extraction main pipe is connected with a waste heat main pipe, the waste heat main pipe is provided with a heat extraction fan, and the heat extraction fan is used for extracting gas in the heat exchange pipes to the waste heat main pipe.

4. The system for recycling and reusing the waste heat of a kiln according to claim 3, characterized in that: The first waste heat pipe is connected with a second cold air pipe, the second cold air pipe is provided with a second valve, the second valve is used for controlling the flow of cold air in the second cold air pipe, the first waste heat pipe is provided with a third valve at a position between the second cold air pipe and the heat inlet main pipe, and the third valve is used for controlling the flow of tail cooling exhaust gas in the first waste heat pipe.

5. The system for recycling and reusing the waste heat of a kiln according to claim 3, characterized in that: The tail cooling area comprises a high-temperature section close to the slow cooling area, the heat inlet main pipe of the high-temperature section is communicated with the heat extraction main pipe, a fourth valve is arranged between the heat inlet main pipe and the heat extraction main pipe, the fourth valve is used for controlling the flow of high-temperature tail cooling exhaust gas of the high-temperature section into the heat extraction main pipe, the heat inlet main pipe is provided with a fifth valve, and the fifth valve is used for controlling the amount of high-temperature tail cooling exhaust gas of the high-temperature section discharged into the heat inlet main pipe.

6. The system for recycling and reusing the waste heat of a kiln according to claim 3, characterized in that: The slow cooling area comprises an overheating section far away from the tail cooling area, the heat extraction main pipe is provided with a sixth valve, and the sixth valve is used for controlling the amount of high-temperature slow cooling exhaust gas generated by the overheating section and discharged into the heat extraction main pipe.

7. The system for recycling and reusing the waste heat of a kiln according to claim 6, characterized in that: A first temperature sensor is further arranged, the first temperature sensor is used for detecting a first temperature value of a position close to the tail cooling area in the overheating section, and when the first temperature value reaches a second preset value, the opening degree of the sixth valve is increased.

8. The system for recycling and reusing the waste heat of a kiln according to claim 3, characterized in that: The slow cooling area is connected with a slow cooling air exhaust hood, the other end of the slow cooling air exhaust hood is connected to the heat extraction main pipe, the slow cooling air exhaust hood is provided with a seventh valve, and the seventh valve is used for controlling the flow of the slow cooling air exhaust hood.

9. The system for recycling and reusing the waste heat of a kiln according to claim 3, characterized in that: The third cold air pipe is connected between the heat extraction fan and the waste heat main pipe, and is provided with an eighth valve for controlling the flow of cold air in the third cold air pipe.

10. The system for recycling and reusing the waste heat of a kiln according to claim 3, characterized in that: The waste heat main pipe is connected to a drying air inlet of a drying kiln, and can provide gas to the drying kiln.

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