Particle material waste heat recovery system and its cooling box

Abstract

The present invention relates to a waste heat recovery system for particulate materials and a cooling box thereof in the field of energy-saving and environmental protection technology, comprising a box body and a heat exchange tube module, a first partition wall, a second partition wall, an air distribution plate and a hood arranged in the box body; the particulate materials to be cooled enter the feed channel from the material inlet, and the airflow enters from the fluidizing air inlet to float the particulate materials, and the particulate materials floating above the discharge channel fall into the discharge channel because their weight is greater than their buoyancy, and the particulate materials falling into the discharge channel are discharged from the material outlet, and the heat exchange airflow flows out from the fluidizing air outlet, and the heat exchange liquid in the heat exchange tube module flows out from the hot water outlet. The cooling box designed by the present invention forms a feed channel and a discharge channel with upper and lower openings staggered in the box body, and the air distribution plate is located outside the discharge channel, so that the particles suspended above the discharge channel with the airflow can fall, so that the particulate materials can exchange heat with the fluidizing airflow and the heat exchange tube module at the same time, which effectively improves the cooling efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy conservation and environmental protection, and in particular, relates to a particle material waste heat recovery system and a cooling box thereof. Background Art

[0002] The hot ore temperature of sintered ore in my country is generally between 700 and 800°C. After the sintered ore is crushed, belt transportation is the most common mode of transportation, so the crushed ore particles need to be cooled. The particle size of the crushed ore particles is generally less than 20mm. At present, the cooling process supporting equipment usually chooses a cooler, which can reduce the temperature of the crushed ore particles to 150°C after the cold air is introduced into the equipment to meet the transportation requirements. During the application of the above-mentioned cooler equipment, the operating personnel found that there were problems such as large bed surface, which made the flow of crushed ore particles difficult, slow cooling speed and too large equipment footprint, and the 150°C discharge still had the problem of energy waste, so it was necessary to develop new technologies to solve the above problems.

[0003] Through the search of prior art, it is found that the Chinese invention patent number is CN109253629A, and the name of the invention is a method for recovering solid particulate waste heat resources. It uses more than 3 heat-taking material tanks as a group to form a particulate waste heat recovery unit, and each heat-taking material tank undergoes heat exchange and preheating processes respectively, and uses heat exchange medium to circulate in each heat-taking material tank to fully recover the particulate waste heat; according to the type, output and waste heat temperature of solid particulate matter, the number of heat-taking material tanks to be set in the particulate waste heat recovery unit is determined, and the method of completing heat exchange in the previous heat-taking material tank first and then preheating the heat exchange air intake of the next heat-taking material tank is adopted to realize a multi-stage cyclic heat extraction process. Although the invention adopts a multi-stage recovery method, it is still insufficient in terms of waste heat recovery efficiency and waste heat utilization rate. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a particulate material waste heat recovery system and a cooling box thereof.

[0005] A particle material cooling box provided by the present invention comprises a box body and a heat exchange tube module, a first partition wall, a second partition wall, an air distribution plate and a hood arranged in the box body;

[0006] A material inlet is provided on one side of the top of the box body, and a material outlet is provided on one side of the bottom of the box body. The first partition wall is suspended and connected in the box body near the material inlet to form a feed channel, and the second partition wall is connected in the box body near the material outlet to form a discharge channel. An opening for the entry of particulate materials is reserved between the top of the second partition wall and the top plate of the box body. The heat exchange tube module is located between the first partition wall and the second partition wall, and the cold water inlet and hot water outlet of the heat exchange tube module are respectively located on opposite sides of the box body; a fluidizing air outlet is provided above the box body, and a fluidizing air inlet is provided below the box body. The hood is connected to the air distribution plate, and the air distribution plate is provided above the fluidizing air inlet. The air distribution plate is located between the second partition wall and the inner wall of the box body near the first partition wall.

[0007] The particulate material to be cooled enters the feed channel from the material inlet, and the airflow enters from the fluidizing air inlet to float the particulate material. The particulate material floating above the discharge channel falls into the discharge channel because its own weight is greater than the buoyancy. The particulate material falling into the discharge channel is discharged from the material outlet, the heat exchange airflow flows out from the fluidizing air outlet, and the heat exchange liquid in the heat exchange tube module flows out from the hot water outlet.

[0008] In some implementations, the cooling box is further provided with a return port and a discharge port, the return port is adjacent to the material inlet, and the discharge port is located between the air distribution plate and the return port.

[0009] The present invention also provides a particle material waste heat recovery system, which adopts the particle material cooling box and also includes a gas heat recovery subsystem and a liquid heat recovery subsystem;

[0010] A plurality of cooling boxes are stacked and connected in series to form a material cooling subsystem, wherein the cooling boxes from the bottom to the top are sequentially the first cooling box to the Nth cooling box, wherein N is a natural number greater than 1, and the particulate material to be cooled enters from the material inlet of the Nth cooling box, is cooled to a predetermined temperature through multi-stage heat exchange, and is discharged from the material outlet of the first cooling box;

[0011] The hot gas generated by each cooling box is introduced into the gas heat recovery subsystem through the fluidizing air outlet for waste heat recovery, and the hot water generated by each cooling box is introduced into the liquid heat recovery subsystem for waste heat recovery.

[0012] In some embodiments, the gas heat recovery subsystem includes a first mixing device, a separation device, and a heat exchange device that are connected in sequence, and the fluidizing air outlets from the first cooling box to the Nth cooling box are all connected to the first mixing device. The hot gas mixed by the first mixing device enters the separation device to separate the particulate material, and the separated hot gas is input into the heat exchange device for heat exchange.

[0013] In some embodiments, the gas heat recovery subsystem further includes a wind box and a fan, the heat exchange device is connected to the wind box through the fan, and the wind box is connected to the fluidizing air inlet of at least one of the cooling boxes from the first cooling box to the Nth cooling box.

[0014] In some embodiments, a flow meter and an electric damper are installed in the pipeline between the wind box and the cooling box, and the air flow entering the cooling box is controlled by the flow meter and the electric damper.

[0015] In some embodiments, the liquid heat recovery subsystem includes a second mixing device and a third mixing device, the second mixing device is connected to the hot water outlets of the first cooling box to the Mth cooling box, wherein M is a natural number and M<N, the second mixing device receives and mixes liquids in medium and low temperature sections, the third mixing device is connected to the hot water outlets of the M+1th cooling box to the Nth cooling box, and the third mixing device receives and mixes liquids in high temperature sections.

[0016] In some embodiments, the heat exchange device is in communication with the second mixing device, and the hot water in the heat exchange device is passed into the second mixing device.

[0017] In some embodiments, the second mixing device is connected to at least one of the M+1th cooling box to the Nth cooling box, and the hot water in the second mixing device is introduced into the heat exchange tube module through the cold water inlet.

[0018] In some implementations, the number of the cooling boxes forming the material cooling subsystem is 2 to 10.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The cooling box designed by the present invention forms a feed channel and a discharge channel with staggered upper and lower openings in the box body, and the air distribution plate is located on the outside of the discharge channel, so that the particles suspended above the discharge channel with the air flow can fall down, so that the particulate material can exchange heat with the fluidizing air flow and the heat exchange tube module at the same time, which effectively improves the cooling efficiency.

[0021] 2. The waste heat recovery system for particulate materials designed by the present invention adopts a stacked series arrangement of multiple cooling boxes, which changes the single large bed layer of the traditional cooling machine into multiple small beds, which can greatly improve the fluidization state of the solid material, increase the material cooling speed and cooling effect, save equipment floor space, effectively control the discharge temperature, and can be adjusted according to user needs, thereby improving the waste heat recovery efficiency of solid materials. In addition, the stacked series arrangement of cooling boxes can form the overall structure of the multi-stage heat exchange device while being able to classify and recycle the waste heat of different qualities formed in cooling boxes of different levels, further improving the utilization efficiency of waste heat.

[0022] 3. The particle material waste heat recovery system designed by the present invention further improves the utilization efficiency of waste heat after recovery by optimizing the correlation between subsystems. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0024] Figure 1 It is a schematic diagram of the main structure of the cooling box of the present invention;

[0025] Figure 2 It is a left-side structural schematic diagram of the cooling box of the present invention;

[0026] Figure 3 It is a schematic diagram of the top view of the cooling box of the present invention;

[0027] Figure 4 This is a schematic structural diagram of an implementation scheme of a heat exchange tube module in a cooling box of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the waste heat recovery system of particulate materials of the present invention;

[0029] Description of reference numerals: first cooling box 1, second cooling box 2, third cooling box 3, fourth cooling box 4, first mixing device 5, separation device 6, heat exchange device 7, booster fan 8, bellows 9, first flow meter 10, second flow meter 11, third flow meter 12, fourth flow meter 13, first electric damper 14, second electric damper 15, third electric damper 16, fourth electric damper 17, second mixing device 18, third mixing device 19, water supply device 20;

[0030] Material inlet 101 / 201 / 301 / 401, material outlet 102 / 202 / 302 / 402, fluidizing air inlet 103 / 203 / 303 / 403, fluidizing air outlet 104 / 204 / 304 / 404, cold water inlet 105 / 205 / 305 / 405, hot water outlet 106 / 206 / 306 / 406, return port 107 / 207 / 307 / 407, discharge port 108 / 208 / 308 / 408, inspection port 109 / 209 / 309 / 409, air distribution plate 110 / 210 / 310 / 410, wind hood 111 / 211 / 311 / 411, heat exchange tube module 112 / 212 / 312 / 412, box body 113 / 213 / 313 / 413, first partition wall 114 / 214 / 314 / 414, second partition wall 115 / 215 / 315 / 415. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0032] Example 1

[0033] The present invention provides a cooling box suitable for granular materials, such as Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the structure of the cooling box mainly includes a box body 113 and a heat exchange tube module 112, a first partition wall 114, a second partition wall 115, an air distribution plate 110 and a hood 111 arranged in the box body 113. The box body 113 is provided with a material inlet 101, a material outlet 102, a fluidizing air inlet 103, a fluidizing air outlet 104, a cold water inlet 105, and a hot water outlet 106. In some embodiments, the box body 113 is also provided with a return port 107, a discharge port 108 and an inspection port 109.

[0034] The material inlet 101 is located in the middle of one side of the top of the box 113, and the material outlet 102 is located in the middle of the other side of the bottom of the box 113. In some embodiments, the material inlet 101 and the material outlet 102 have the same size to ensure that the material inlet 101 and the material outlet 102 can be directly connected when multiple boxes are stacked. The fluidizing air inlet 103 is located on the outside of the box below the air distribution plate 110, and the fluidizing air outlet 104 is located on the outside of the upper part of the box. The return port 107 is located above the box near the outside of the material inlet 101, the discharge port 108 is located below the return port 107 on the upper side of the air distribution plate 110, and the inspection port 109 is located above the discharge port 108. The first partition wall 114 is located on the side of the material inlet 101 inside the box 113, and is connected to the inner wall of the box 113 in a hanging manner to form a feed channel. The second partition wall 115 is located on one side of the material outlet 102 inside the box 113 to form a discharge channel, and an opening for granular materials to enter is provided between the top of the second partition wall 115 and the inner wall of the top plate of the box 113. The air distribution plate 110 is provided on the lower side of the box 113, and the air distribution plate 110 is located between the second partition wall 115 and the inner wall of the box 113 close to the first partition wall 114. At this time, there is no air distribution plate 110 structure in the discharge channel, and the granular materials entering the upper part of the channel are subject to a buoyancy force less than their own weight, and can then fall into the discharge channel. A sufficient number of hoods 111 are evenly arranged on the air distribution plate 110. The heat exchange tube module 112 is located above the air distribution plate 110 inside the box 113. The heat exchange tube module 112 is also located between the first partition wall 114 and the second partition wall 115. The cold water inlet 105 is located outside the box on one side of the heat exchange tube module 112, and the hot water outlet 106 is located outside the box on the other side of the heat exchange tube module 112.

[0035] The working principle of the cooling box of the present invention is as follows: the particle size of the solid particulate material is small and can meet the fluidization conditions. The external airflow enters the box body from the fluidization air inlet. Under the action of the fluidization air, the particulate material floats upward and gradually floats from the feed channel to the discharge channel. The particulate material suspended above the discharge channel falls into the channel because its buoyancy is less than gravity, and then is discharged from the material outlet. At this time, the high-temperature air is discharged from the fluidization air outlet into the subsequent device, and the hot water exchanged in the heat exchange tube module is input into the subsequent device from the hot water outlet. When the discharge does not meet the requirements, it can enter the cooling box again through the return port 107 until the discharge meets the requirements. The discharge port 108 and the inspection port 109 can be used in maintenance and other situations to directly discharge all residual materials. The cooling box designed by the present invention forms a feed channel and a discharge channel with upper and lower openings staggered in the box body, and the air distribution plate is located outside the discharge channel, so that the particles suspended above the discharge channel with the airflow can fall, so that the particulate material can exchange heat with the fluidization airflow and the heat exchange tube module at the same time, which effectively improves the cooling efficiency.

[0036] In some embodiments, the heat exchange tube module 112 in the cooling box is a drawer-type heating surface, which can be quickly replaced as a whole during maintenance, saving downtime and improving work efficiency.

[0037] Example 2

[0038] This embodiment 2 is a particle material waste heat recovery system formed on the basis of embodiment 1. Figure 5 As shown, the cooling box suitable for particulate materials described in Example 1 is used, and multiple cooling boxes are stacked in series to form a material cooling subsystem, which also includes a gas heat recovery subsystem and a liquid heat recovery subsystem.

[0039] In this embodiment, the material cooling subsystem is composed of four groups of cooling boxes stacked in series, and the four groups of cooling boxes are, from bottom to top, a first cooling box 1, a second cooling box 2, a third cooling box 3, and a fourth cooling box 4.

[0040] The material inlet 101 of the first cooling box 1 is connected to the material outlet 202 of the second cooling box 2, the material inlet 201 of the second cooling box 2 is connected to the material outlet 302 of the third cooling box 3, and the material inlet 301 of the third cooling box 3 is connected to the material outlet 402 of the fourth cooling box. The operating principle of the material cooling subsystem in this embodiment is: 800°C solid material enters from the material inlet 401 of the fourth cooling box 4, undergoes the first cooling in the fourth cooling box 4 to about 500°C, and the discharged material enters the material inlet 301 of the third cooling box 3 from the material outlet 402 of the fourth cooling box 4. The second cooling is performed in the third cooling box 3 to about 250°C, and the discharged material enters the material inlet 201 of the second cooling box 2 from the material outlet 302 of the third cooling box 3. The third cooling is performed in the second cooling box 2 to about 150°C, and the material is discharged from the material outlet 202 of the second cooling box 2 into the material inlet 101 of the first cooling box 1. The fourth cooling is performed in the fourth cooling box 1 to about 100°C, and the material is discharged from the material outlet 102 of the first cooling box 1 and transported by belt for subsequent use, where multi-layer cooling of solid materials is achieved. The number of cooling boxes can be adjusted according to changes in material parameters. When a higher discharge temperature is required, the number of cooling boxes can be reduced, and when a lower discharge temperature is required, the number of cooling boxes can be increased.

[0041] The gas heat recovery subsystem includes a first mixing device 5, a separation device 6 and a heat exchange device 7 which are connected in sequence. The first mixing device 5 is a storage tank which is connected to the fluidizing air outlet 104 of the first to fourth cooling boxes through a pipeline, and is used to receive hot air of different temperatures and mix them. The separation device 6 is a cyclone separation device which separates large particles of materials in the hot air transported by the first mixing device 5, and the hot air enters the heat exchange device 7 for heat exchange. The heat exchange device 7 is a heat pipe heat exchanger, in which the cold water inlet is connected to the external water supply device 20, and the hot water after heat exchange is input into other devices through the hot water inlet.

[0042] The liquid heat recovery subsystem includes a second mixing device 18 and a third mixing device 19. The third mixing device 19 is a storage tank, the inlet of which is connected to the hot water outlet 306 of the third cooling box 3 and the hot water outlet 406 of the fourth cooling box 4, receiving and mixing the hot water in the high-temperature section of the cooling box, recovering the high-grade heat of the particulate material and using it to generate superheated steam. The second mixing device 18 is also a storage tank, the inlet of which is connected to the hot water outlet 106 of the first cooling box 1 and the hot water outlet 206 of the second cooling box 2, receiving and mixing the hot water in the low-temperature section of the cooling box, recovering the low-grade heat of the particulate material and using it to generate hot water.

[0043] The present invention adopts a stacked series arrangement of multiple cooling boxes, which changes the single large bed layer of the traditional cooling machine into multiple small beds, which can greatly improve the fluidization state of solid materials, increase the cooling speed and cooling effect of materials, save equipment floor space, effectively control the discharge temperature, and can be adjusted according to user needs, thereby improving the waste heat recovery efficiency of solid materials. In addition, the stacked series arrangement of cooling boxes can form the overall structure of the multi-stage heat exchange device while being able to classify and recycle the waste heat of different qualities formed in cooling boxes of different levels, further improving the utilization efficiency of waste heat.

[0044] Example 3

[0045] This embodiment 3 is formed on the basis of embodiment 2, and further improves the utilization efficiency of waste heat after recovery by optimizing the association relationship between subsystems. Specifically:

[0046] like Figure 5As shown, in terms of the gas heat recovery subsystem, the gas heat recovery subsystem is also provided with a bellows 9 and a fan 8. The heat exchange device 7 is connected to the bellows 9 through the fan 8, and the low-temperature gas after heat exchange in the heat exchange device 7 is transported to the bellows 9 through the fan 8. The bellows 9 is connected to the fluidizing air inlet 103 of the first to fourth cooling boxes through a pipeline, thereby forming a circulation of fluidizing air and improving the efficiency of waste heat utilization. Furthermore, the pipeline between the bellows 9 and the fluidizing air inlet 103 of the cooling box is controlled by a flow meter and an electric damper to effectively control the amount of fluidizing air entering the cooling box, specifically: the flow meter includes a first flow meter 10, a second flow meter 11, a third flow meter 12 and a fourth flow meter 13. The electric damper includes a first electric damper 14, a second electric damper 15, a third electric damper 16 and a fourth electric damper 17. The wind box 9 is connected to the fluidizing air inlet 103 of the first cooling box 1 through the first flow meter 10 and the first electric damper 14, the wind box 9 is connected to the fluidizing air inlet 203 of the second cooling box 2 through the second flow meter 11 and the second electric damper 15, the wind box 9 is connected to the fluidizing air inlet 303 of the third cooling box 3 through the third flow meter 12 and the third electric damper 16, and the wind box 9 is connected to the fluidizing air inlet 403 of the fourth cooling box 4 through the fourth flow meter 13 and the fourth electric damper 17. In some embodiments, the present invention controls four electric dampers to ensure that the four flow meter values ​​are equal, so as to achieve the purpose of having the same fluidizing air volume entering the four cooling boxes and the same fluidization speed of the material inside the cooling boxes.

[0047] In terms of the liquid heat recovery subsystem, the second mixing device 18 is connected to the heat exchange device 7, and the hot water of the heat exchange device 7 is input into the second mixing device 18 through a pipeline to improve the recovery rate of liquid waste heat. Furthermore, the hot water outlet of the second mixing device 18 is respectively connected to the cold water inlet 105 of the third cooling box 3 and the fourth cooling box 4, and the third cooling box 3 and the fourth cooling box 4 are input with warm water with waste heat as the heat exchange water source of the heat exchange tube module, which can further improve the heat exchange efficiency of the third cooling box 3 and the fourth cooling box 4 and the quality of the waste heat after heat exchange.

[0048] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A particle material cooling box, characterized in that: It comprises a box body and a heat exchange tube module, a first partition wall, a second partition wall, an air distribution plate and a hood arranged in the box body; A material inlet is provided on one side of the top of the box body, and a material outlet is provided on one side of the bottom of the box body. The first partition wall is suspended and connected in the box body near the material inlet to form a feed channel, and the second partition wall is connected in the box body near the material outlet to form a discharge channel. An opening for the entry of particulate materials is reserved between the top of the second partition wall and the top plate of the box body. The heat exchange tube module is located between the first partition wall and the second partition wall, and the cold water inlet and hot water outlet of the heat exchange tube module are respectively located on opposite sides of the box body; a fluidizing air outlet is provided above the box body, and a fluidizing air inlet is provided below the box body. The hood is connected to the air distribution plate, and the air distribution plate is provided above the fluidizing air inlet. The air distribution plate is located between the second partition wall and the inner wall of the box body near the first partition wall. The particulate material to be cooled enters the feed channel from the material inlet, and the airflow enters from the fluidizing air inlet to float the particulate material. The particulate material floating above the discharge channel falls into the discharge channel because its own weight is greater than the buoyancy. The particulate material falling into the discharge channel is discharged from the material outlet, the heat exchange airflow flows out from the fluidizing air outlet, and the heat exchange liquid in the heat exchange tube module flows out from the hot water outlet.

2. The particulate material cooling box according to claim 1, characterized in that: The cooling box is also provided with a return port and a discharge port. The return port is adjacent to the material inlet, and the discharge port is located between the air distribution plate and the return port.

3. A waste heat recovery system for particulate matter, characterized in that: The particulate material cooling box according to claim 1 or 2 further comprises a gas heat recovery subsystem and a liquid heat recovery subsystem; A plurality of cooling boxes are stacked and connected in series to form a material cooling subsystem, wherein the cooling boxes from the bottom to the top are sequentially the first cooling box to the Nth cooling box, wherein N is a natural number greater than 1, and the particulate material to be cooled enters from the material inlet of the Nth cooling box, is cooled to a predetermined temperature through multi-stage heat exchange, and is discharged from the material outlet of the first cooling box; The hot gas generated by each cooling box is introduced into the gas heat recovery subsystem through the fluidizing air outlet for waste heat recovery, and the hot water generated by each cooling box is introduced into the liquid heat recovery subsystem for waste heat recovery.

4. The particulate material waste heat recovery system according to claim 3 is characterized in that: The gas heat recovery subsystem includes a first mixing device, a separation device and a heat exchange device which are connected in sequence. The fluidizing air outlets from the first cooling box to the Nth cooling box are all connected to the first mixing device. The hot gas mixed by the first mixing device enters the separation device to separate the particulate material, and the separated hot gas is input into the heat exchange device for heat exchange.

5. The particulate material waste heat recovery system according to claim 4, characterized in that: The gas heat recovery subsystem also includes a wind box and a fan. The heat exchange device is connected to the wind box through the fan. The wind box is connected to the fluidizing air inlet of at least one of the cooling boxes from the first cooling box to the Nth cooling box.

6. The particulate material waste heat recovery system according to claim 5, characterized in that: A flow meter and an electric damper are installed in the pipeline between the wind box and the cooling box, and the air flow entering the cooling box is controlled by the flow meter and the electric damper.

7. The particulate material waste heat recovery system according to claim 4, characterized in that: The liquid heat recovery subsystem includes a second mixing device and a third mixing device. The second mixing device is connected to the hot water outlets of the first cooling box to the Mth cooling box, where M is a natural number and M<N. The second mixing device receives and mixes liquids in medium and low temperature sections. The third mixing device is connected to the hot water outlets of the M+1th cooling box to the Nth cooling box, and the third mixing device receives and mixes liquids in high temperature sections.

8. The particulate material waste heat recovery system according to claim 7, characterized in that: The heat exchange device is communicated with the second mixing device, and the hot water of the heat exchange device flows into the second mixing device.

9. The particulate material waste heat recovery system according to claim 7, characterized in that: The second mixing device is connected to at least one of the M+1th cooling box to the Nth cooling box, and the hot water in the second mixing device is introduced into the heat exchange tube module through the cold water inlet.

10. The particulate material waste heat recovery system according to claim 3, characterized in that: The number of the cooling boxes forming the material cooling subsystem is 2 to 10.

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