Coal mine solid waste powder suspension calcining equipment and coal mine solid waste treatment system

Abstract

The utility model discloses coal mine solid waste powder suspension calcining equipment and a coal mine solid waste treatment system. The coal mine solid waste powder suspension calcining equipment comprises a smoldering calcining furnace, a separation preheating device and a cooling device, wherein a powder inlet of the separating and preheating device is used for receiving and preheating coal mine solid waste powder which is not preheated; a powder inlet of the smoldering calcining furnace is communicated with a first powder outlet of the separation preheating device so as to perform smoldering calcining on preheated coal mine solid waste powder discharged from the first powder outlet; an air outlet of the smoldering calcining furnace is communicated with an air inlet of the separation preheating device, so that high-temperature flue gas containing coal mine solid waste powder subjected to smoldering calcining is conveyed into the separation preheating device for gas-solid separation; the separation preheating device is provided with a second powder outlet, and the second powder outlet communicates with the powder inlet of the cooling device so that the coal mine solid waste powder obtained after gas-solid separation can be conveyed into the cooling device to be cooled.

Description

Technical Field

[0001] This application belongs to the field of coal mine solid waste treatment technology, specifically relating to a coal mine solid waste powder suspension calcination equipment and a coal mine solid waste treatment system. Background Technology

[0002] During the raw coal mining process, every ton of raw coal mined generates 100-250 kg of coal mine solid waste (i.e., coal-bearing kaolin). This large amount of coal mine solid waste not only poses land occupation problems but also represents a waste of resources. Currently, the utilization rate of coal mine solid waste is low, typically below 20%. There are currently no large-scale successful applications for utilizing the large quantities of coal mine solid waste. A few scholars or companies have attempted to prepare microcrystalline glass, silicon aluminate oxides, ceramic matrix materials, aggregates, and cement products, but most coal mine solid waste has not been reused on a large scale due to high disposal costs or poor product quality.

[0003] Coal mine solid waste exhibits inherent inertness due to its long mineral formation history, weathering, and sedimentation, making it insoluble or sparingly soluble in acidic and alkaline solutions. Therefore, extracting valuable minerals or chemicals from coal mine solid waste requires an activation process to disrupt its stable crystal and mineral structures, creating unit cell vacancies and revealing its original characteristics, thus allowing for the extraction of valuable mineral elements. Calcination of coal mine solid waste is a necessary means to achieve this activation.

[0004] Calcination and activation of coal mine solid waste is an important process for its reuse. In related technologies, stockpiled calcination is commonly used. Stockpiled calcination typically uses granular or blocky coal mine solid waste in a stockpile state within the calcination kiln. However, the stockpiled state of larger-sized coal mine solid waste, coupled with its low thermal conductivity, results in not only a small contact area between the waste and the hot gas flow, leading to low heat exchange efficiency, but also a significant temperature difference between the inside and outside of the blocky waste. This results in over-burning on the outside and under-burning on the inside, severely impacting the quality and activity of the final calcined product. Furthermore, the small contact area between the waste and the hot gas flow leads to high energy consumption during the calcination and activation process. Utility Model Content

[0005] This application discloses a coal mine solid waste powder suspension calcination equipment and a coal mine solid waste treatment system to solve the problems of insufficient internal combustion and excessive external combustion and high energy consumption in the calcination and activation of coal mine solid waste in related technologies.

[0006] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0007] In a first aspect, this utility model discloses a coal mine solid waste powder suspension calcination device, comprising a smoldering calcination furnace, a separation preheating device, and a cooling device; wherein...

[0008] The powder inlet of the separation and preheating device is used to receive and preheat the unheated coal mine solid waste powder; the powder inlet of the smoldering calciner is connected to the first powder outlet of the separation and preheating device for smoldering calcining the preheated coal mine solid waste powder discharged from the first powder outlet.

[0009] The air outlet of the smoldering calciner is connected to the air inlet of the separation preheating device to transport high-temperature flue gas containing the coal mine solid waste powder after smoldering calcination to the separation preheating device for heat exchange and gas-solid separation; the separation preheating device has a second powder outlet, which is connected to the powder inlet of the cooling device to transport the coal mine solid waste powder after calcination and gas-solid separation to the cooling device for cooling.

[0010] Secondly, this utility model discloses a coal mine solid waste treatment system, including a pulverizing device and the coal mine solid waste powder suspension calcination device mentioned above, wherein the powder outlet of the pulverizing device is connected to the powder inlet of the separation and preheating device.

[0011] In this embodiment of the invention, the pulverizing equipment first converts the lumpy coal mine solid waste into coal mine solid waste powder (i.e., powdered coal mine solid waste). Then, the coal mine solid waste powder is calcined and activated using a coal mine solid waste powder suspension calcination device. Due to the small particle size of the coal mine solid waste powder, the heat transfer efficiency between the powder particles is high during the calcination and activation process, resulting in a faster dehydroxylation reaction of the coal mine solid waste and achieving a more efficient decomposition reaction, ultimately improving the calcination and activation efficiency. Simultaneously, converting the lumpy coal mine solid waste into coal mine solid waste powder enables suspension combustion, allowing the coal mine solid waste powder to burn more uniformly and fully during the calcination and activation process. This effectively avoids the adverse phenomena such as internal under-burning and external over-burning that easily occur when lumpy coal mine solid waste is piled up for calcination, as described in the background art. Moreover, due to the high heat transfer efficiency between powders during the calcination and activation process, the heat utilization efficiency can be improved, thereby reducing the energy consumption of calcination and activation. The coal mine solid waste powder suspension calcination equipment can reuse the waste heat during the calcination process by configuring a separation preheating device. The separation preheating device makes full use of the preheating of high-temperature flue gas to preheat the uncalcined coal mine solid waste powder to reduce the energy consumption in the subsequent calcination process. Furthermore, the preheated coal mine solid waste powder can undergo a more complete decomposition reaction, which is conducive to improving the calcination and activation effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the coal mine solid waste treatment system disclosed in this utility model embodiment;

[0013] Figure 2 This is a schematic diagram of the structure of the powder-making equipment disclosed in the embodiments of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the coal mine solid waste powder suspension calcination equipment disclosed in this utility model embodiment;

[0015] Figure 4 This is a partial structural schematic diagram of the coal mine solid waste treatment system disclosed in this utility model embodiment.

[0016] Explanation of reference numerals in the attached figures:

[0017] 01-Coal mine solid waste powder suspension calcination equipment; 02-Powdering equipment; 03-Powder finished product packaging equipment; 201-Crushing device; 202-First homogenization device; 203-Grinding device; 204-Second homogenization device; 2011-Plate feeder; 2012-Wave roller feeder; 2013-Hammer crusher; 205-Metering feeder.

[0018] 10-Cathode calcination furnace, 011-Powder inlet, 012-Air outlet, 013-Air inlet

[0019] 20 - Separation preheating device; 21 - Fifth cyclone separator; 211 - Air inlet; 212 - Air outlet; 213 - Powder outlet; 22 - Fourth cyclone separator; 221 - Powder outlet; 222 - Powder inlet; 223 - Air outlet; 23 - Third cyclone separator; 231 - Powder outlet; 232 - Powder inlet; 233 - Air outlet; 24 - Second cyclone separator; 241 - Powder outlet; 242 243 - Powder inlet, 25 - Air outlet, 261 - First cyclone separator, 262 - Powder outlet, 263 - Air inlet, 264 - First connecting pipe, 265 - Second connecting pipe, 266 - Third connecting pipe, 267 - Fourth connecting pipe, 268 - Fifth connecting pipe, 269 - Sixth connecting pipe, 267 - Seventh connecting pipe, 268 - Eighth connecting pipe, 269 - Ninth connecting pipe, 2691 - Powder input port

[0020] 30-Cooling device, 31-Powder inlet, 31-Sixth cyclone separator, 311-Air outlet, 312-Powder outlet, 313-Air inlet, 32-First cooling body, 321-Powder inlet, 322-Air outlet, 323-Air inlet, 33-First blower, 34-First powder finished product discharge pipe, 35-Seventh cyclone separator, 351-Air inlet, 352-Air outlet, 353-Powder outlet, 36-Second cooling body, 361-Powder inlet, 362-Air inlet, 363-Powder outlet, 364-Air outlet, 37-Second blower, 38-Second powder finished product discharge pipe, 39-Eighth cyclone separator, 391-Air inlet, 392-Powder outlet, 393-Air outlet, 310-Third powder finished product discharge pipe.

[0021] 40-Iron removal device

[0022] 50 - Dust collector, 51 - Air inlet, 52 - Air outlet, 53 - Powder outlet, 54 - Fourth powder finished product discharge pipe

[0023] 60 - Powder finished product conveying equipment; 70 - Powder finished product homogenization device. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] The technical solutions disclosed in the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0026] Please refer to Figures 1 to 4 This utility model discloses a coal mine solid waste treatment system. The disclosed coal mine solid waste treatment system includes a coal mine solid waste powder suspension calcination device 01, a powder making device 02, and a powder finished product packaging device 03.

[0027] The pulverizing equipment 02 is used at least to turn coal mine solid waste into powder, that is, to form coal mine solid waste powder. The coal mine solid waste powder suspension calcination equipment 01 is connected to the pulverizing equipment 02. The coal mine solid waste powder suspension calcination equipment 01 is used to perform suspension calcination on the coal mine solid waste powder, thereby finally forming the finished powder product.

[0028] The powder finished product packaging equipment 03 is connected to the coal mine solid waste powder suspension calcination equipment 01. The powder finished product packaging equipment 03 is used to package the powder finished product.

[0029] Kaolinite, the main component of coal mine solid waste, can be dehydroxylated at appropriate temperatures to produce highly active metakaolinite. In this application, the powder product formed after calcination in the coal mine solid waste powder suspension calcination equipment 01 is essentially metakaolinite powder. Calcination of coal mine solid waste is an endothermic reaction. When the temperature rises to around 300℃, kaolinite begins to decompose endothermally, producing metakaolinite and water vapor. As the temperature further increases, the decomposition rate accelerates, and decomposition essentially ends above 800℃. The decomposition reaction rate of coal mine solid waste is mainly affected by calcination temperature and particle size. In this embodiment of the invention, the pulverizing equipment 02 first converts the lumpy coal mine solid waste into coal mine solid waste powder (i.e., powdered coal mine solid waste), and then calcines and activates the coal mine solid waste powder through the coal mine solid waste powder suspension calcination equipment 01. Since the particle size of the coal mine solid waste powder is small, the heat transfer efficiency between the powders is high during the calcination and activation process, which makes the dehydroxylation reaction of the coal mine solid waste faster and achieves a more efficient decomposition reaction, ultimately improving the calcination and activation efficiency.

[0030] Meanwhile, by processing lumpy coal mine solid waste into coal mine solid waste powder for suspension combustion, the coal mine solid waste powder can be burned more uniformly and completely during the calcination and activation process. This effectively avoids the adverse phenomena such as internal under-burning and external over-burning that easily occur when lumpy coal mine solid waste is piled up and calcined, as described in the background technology. Moreover, due to the high heat transfer efficiency between powders during the calcination and activation process, the heat utilization efficiency can be improved, thereby reducing the energy consumption of calcination and activation.

[0031] In this embodiment of the invention, the structure of the pulverizing equipment 02 can be varied. For example, the pulverizing equipment 02 may only include a grinding mill, thereby grinding lumpy coal mine solid waste into coal mine solid waste powder. Considering that the lumpy volume of coal mine solid waste is relatively large during the raw coal mining process, it is not easy to grind it directly. In other embodiments, the pulverizing equipment 02 may include a crushing device 201, a first homogenizing device 202, a grinding device 203, and a second homogenizing device 204 connected in sequence.

[0032] The crushing device 201 is used to crush large pieces of coal mine solid waste to obtain smaller pieces. The first homogenization device 202 is used to perform primary homogenization on the small pieces of coal mine solid waste. The grinding device 203 is used to grind the small pieces of coal mine solid waste after primary homogenization to obtain coal mine solid waste powder. The second homogenization device 204 is used to perform secondary homogenization on the coal mine solid waste powder.

[0033] In this type of pulverizing equipment 02, the large pieces of coal mine solid waste are first crushed by the crushing device 201, which helps reduce the subsequent grinding load of the grinding device 203. Simultaneously, the small pieces of coal mine solid waste are initially homogenized by the first homogenizing device 202 before grinding, which facilitates more even grinding in the subsequent grinding device 203. After the grinding device 203 grinds the small pieces of coal mine solid waste, the resulting coal mine solid waste powder undergoes secondary homogenization, thereby homogenizing the coal mine solid waste and facilitating calcination in the subsequent coal mine solid waste powder suspension calcination device 01.

[0034] In this embodiment of the utility model, the coal mine solid waste powder suspension calcination equipment 10 may include a smoldering calcination furnace 10, a separation preheating device 20, and a cooling device 30.

[0035] The separation preheating device 20 is used at least to preheat coal mine solid waste powder. The powder inlet of the separation preheating device 20 is connected to the second homogenization device 204 to receive and preheat the coal mine solid waste powder that has not been preheated after secondary homogenization.

[0036] The powder inlet 011 of the smoldering calciner 10 is connected to the first powder outlet of the separation preheating device 20 for smoldering calcination of the preheated coal mine solid waste powder discharged from the first powder outlet. The smoldering calciner 10 uses a smoldering calcination method that does not produce open flames. This method facilitates uniform heating and calcination of the coal mine solid waste powder, improving the uniformity of calcination activation. The air outlet 012 of the smoldering calciner 10 is connected to the air inlet of the separation preheating device 20 for conveying the high-temperature flue gas containing the smoldering calcined coal mine solid waste powder to the separation preheating device 20 for heat exchange and gas-solid separation. The gas after gas-solid separation will enter the separation preheating device 20 to preheat the uncalcined coal mine solid waste powder entering the separation preheating device 20, so that the uncalcined coal mine solid waste powder enters the smoldering calciner 10 at a higher temperature. This preheating can facilitate calcination and reduce energy consumption during the calcination process.

[0037] Therefore, in the coal mine solid waste treatment system disclosed in this utility model embodiment, the coal mine solid waste powder suspension calcination equipment 01 can reuse the waste heat during the calcination process by configuring a separation preheating device 20. The separation preheating device 20 makes full use of the waste heat of the high-temperature flue gas to preheat the uncalcined coal mine solid waste powder to reduce energy consumption in the subsequent calcination process. Moreover, the preheated coal mine solid waste powder can perform a more complete decomposition reaction, which is conducive to improving the calcination activation effect.

[0038] The preheating and separation device 20 has a second powder outlet, which is connected to the powder inlet 031 of the cooling device 30. This outlet is used to transport the coal mine solid waste powder after calcination and gas-solid separation to the cooling device 30 for cooling. The coal mine solid waste powder formed after gas-solid separation enters the cooling device 30 through the second powder outlet and is then cooled by the cooling device 30 to finally form the finished powder product. The cooling device 30 is used to cool the calcined coal mine solid waste powder. The cooling device 30 can be of various types, such as air-cooled equipment or liquid-cooled equipment, which achieve cooling through heat exchange. This embodiment of the invention does not limit the specific type of cooling device 30.

[0039] The powder finished product packaging equipment 03 is connected at least to the powder outlet of the cooling device 30 for receiving and packaging the powder finished product. In this embodiment of the invention, the powder finished product packaging equipment 03 can package the powder finished product in bags, boxes, or drums; this embodiment does not limit the specific packaging form of the powder finished product packaging equipment 03. It should be noted that the powder finished product packaging equipment 03 is existing equipment, and its structure, packaging process, and packaging principle are well known and will not be described in detail here.

[0040] In this embodiment of the invention, the crushing device 201 can have various structures. In one embodiment, the crushing device 201 may include a plate feeder 2011, a wave roller feeder 2012, and a hammer crusher 2013 connected in sequence. The hammer crusher 2013 is connected to the first homogenization device 202 to transport the prepared small-lump coal mine solid waste to the first homogenization device 202. The plate feeder 2011 and the wave roller feeder 2012 sequentially transport large-lump coal mine solid waste, ultimately causing the large-lump coal mine solid waste to enter the hammer crusher 2013 for crushing into small-lump coal mine solid waste.

[0041] In this embodiment of the present invention, the grinding device 203 can be a vertical mill, or other types of equipment capable of grinding small lumps of coal mine solid waste into powder. This embodiment of the present invention does not limit the specific type of grinding device 203.

[0042] To achieve more precise feeding into the separation and preheating device 20, in a more specific embodiment, the powder-making equipment 02 disclosed in this utility model embodiment may further include a metering feeder 205. The metering feeder 205 is connected to the powder outlet of the second homogenizing device 204 and the powder inlet of the separation and preheating device 20, and is used to feed powder into the separation and preheating device 20 according to a preset feed amount. The metering feeder 205 can achieve quantitative feeding according to the preset feed amount, thereby making the powder delivery into the separation and preheating device 20 more controllable.

[0043] The separation preheating device 20 can have various structures, as long as it can perform gas-solid separation on the high-temperature flue gas containing calcined coal mine solid waste powder generated by the smoldering calciner 10, and preheat the coal mine solid waste powder entering the separation preheating device 20 with the gas generated from the gas-solid separation. For example, the separation preheating device 20 can be equipped with a gas channel for the high-temperature gas generated from the gas-solid separation to flow through, and a powder channel for the coal mine solid waste powder to flow through. After the high-temperature flue gas undergoes gas-solid separation, the high-temperature gas enters the gas channel, and the unpreheated coal mine solid waste enters the powder channel. During the flow of the high-temperature gas and the unpreheated coal mine solid waste powder, heat exchange occurs through the separation preheating device 20, thereby achieving the purpose of preheating the coal mine solid waste powder, ultimately achieving the purpose of waste heat utilization and improving calcination efficiency.

[0044] This utility model embodiment discloses another specific separation preheating device 20, which may include a fifth cyclone separator 21, a fourth cyclone separator 22, a third cyclone separator 23, a second cyclone separator 24 and a first cyclone separator 25 arranged sequentially above the smoldering calciner 10.

[0045] This distribution pattern facilitates the upward movement of the high-temperature flue gas discharged from the smoldering furnace 10, which then enters the fifth cyclone separator 21, the fourth cyclone separator 22, the third cyclone separator 23, the second cyclone separator 24, and the first cyclone separator 25 directly or indirectly after the high-temperature flue gas is separated from the solid.

[0046] Specifically, the air inlet 211 of the fifth cyclone separator 21 is connected to the air outlet 012 of the smoldering calciner 10 via the first connecting pipe 261, allowing the high-temperature flue gas discharged from the smoldering calciner 10 to enter the fifth cyclone separator 21. The fifth cyclone separator 21 has a separation function, thereby enabling gas-solid separation of the high-temperature flue gas. The coal mine solid waste powder separated by the fifth cyclone separator 21 is the calcined coal mine solid waste powder. It should be noted that the air inlet of the separation preheating device 20 is the air inlet 211 of the fifth cyclone separator 21.

[0047] The powder outlet 221 of the fourth cyclone separator 22 is connected to the powder inlet 011 of the smoldering calciner 10 via a second connecting pipe 262, so as to transport the coal mine solid waste powder flowing through the fourth cyclone separator 22 into the smoldering calciner 10. The fourth cyclone separator 22 also has a gas-solid separation function. The coal mine solid waste powder separated from the powder outlet 221 of the fourth cyclone separator 22 is the coal mine solid waste powder that has been preheated by the separation preheating device 20 and is finally discharged into the smoldering calciner 10. It should be noted that the powder outlet 221 of the fourth cyclone separator 22 is the first powder outlet.

[0048] The third cyclone separator 23 has a gas-solid separation function. The powder outlet 231 of the third cyclone separator 23 is connected to the powder inlet 222 of the fourth cyclone separator 22 through the third connecting pipe 263 to transport the coal mine solid waste powder flowing through the third cyclone separator 23 to the fourth cyclone separator 22. The air outlet 212 of the fifth cyclone separator 21 is connected to the third connecting pipe 263 through the fourth connecting pipe 264 to drive the coal mine solid waste powder into the fourth cyclone separator 22 and preheat the coal mine solid waste powder with high-temperature flue gas. In this case, the gas generated after gas-solid separation in the fifth cyclone separator 21 can also be used to drive the coal mine solid waste powder into the fourth cyclone separator 22, and can be mixed with the coal mine solid waste powder in advance for heat exchange. Then it enters the fourth cyclone separator 22 and exchanges heat again in the fourth cyclone separator 22, and finally passes through the fourth cyclone separator 22 for gas-solid separation. Of course, the fourth connecting pipe 264 can also be directly connected to the air outlet 212 of the fifth cyclone separator 21 and the fourth cyclone separator 22, so that the gas generated after gas-solid separation in the fifth cyclone separator 21 can be directly mixed and heat exchanged in the fourth cyclone separator 22 and finally separated into gas and solid by the fourth cyclone separator 22.

[0049] The powder outlet 241 of the second cyclone separator 24 is connected to the powder inlet 232 of the third cyclone separator 23 via a fifth connecting pipe 265 to transport the coal mine solid waste powder flowing through the second cyclone separator 24 to the third cyclone separator 23. The second cyclone separator 24 has a gas-solid separation function, and the coal mine solid waste powder separated by the second cyclone separator 24 is transported to the third cyclone separator 23 via the fifth connecting pipe 265.

[0050] The outlet 223 of the fourth cyclone separator 22 is connected to the fifth connecting pipe 265 via the sixth connecting pipe 266 to drive coal mine solid waste powder into the third cyclone separator 23 via gas, where the coal mine solid waste powder is preheated by the gas. In this case, the gas generated after gas-solid separation in the fourth cyclone separator 22 can also be used to drive the coal mine solid waste powder into the third cyclone separator 23, where it can be mixed and heat-exchanged before entering the third cyclone separator 23 for further heat exchange and finally undergo gas-solid separation. Alternatively, the sixth connecting pipe 266 can also directly connect the outlet 223 of the fourth cyclone separator 22 and the third cyclone separator 23, allowing the gas generated after gas-solid separation in the fourth cyclone separator 22 to directly mix and heat-exchange with the coal mine solid waste powder in the third cyclone separator 23 before finally undergoing gas-solid separation.

[0051] The powder outlet 251 of the first cyclone separator 25 is connected to the powder inlet 242 of the second cyclone separator 24 through the seventh connecting pipe 267 to transport the coal mine solid waste powder flowing through the first cyclone separator 25 to the second cyclone separator 24. The first cyclone separator 25 has a gas-solid separation function. The coal mine solid waste powder separated by the first cyclone separator 25 will be transported to the second cyclone separator 24 through the seventh connecting pipe 267.

[0052] The outlet 233 of the third cyclone separator 23 is connected to the seventh connecting pipe 267 via the eighth connecting pipe 268, so that the coal mine solid waste powder is driven into the second cyclone separator 24 by high-temperature flue gas and preheated by the high-temperature flue gas. In this case, the gas generated by the gas-solid separation of the third cyclone separator 23 can also be used to drive the coal mine solid waste powder into the second cyclone separator 24, and can be mixed and heated in advance with the coal mine solid waste powder, and then enter the second cyclone separator 24 for heat exchange again and finally pass through the second cyclone separator 24 for gas-solid separation. Of course, the eighth connecting pipe 268 can also be directly connected to the outlet 233 of the third cyclone separator 23 and the second cyclone separator 24, so that the gas generated after the gas-solid separation of the third cyclone separator 23 can be directly mixed and heated with the coal mine solid waste powder in the second cyclone separator 24 and finally pass through the second cyclone separator 24 for gas-solid separation.

[0053] The outlet 243 of the second cyclone separator 24 is connected to the inlet 252 of the first cyclone separator 25 via the ninth connecting pipe 269. The ninth connecting pipe 269 is provided with a powder inlet 2691, which is the powder inlet of the separation preheating device 20. This allows the coal mine solid waste powder entering through the powder inlet 2691 to enter the first cyclone separator 25 under the drive of the gas. The powder outlet 213 of the fifth cyclone separator 21 is connected to the cooling device 30. The calcined coal mine solid waste powder produced after the high-temperature flue gas undergoes gas-solid separation in the fifth cyclone separator 21 enters the cooling device 30 through the powder outlet 213 for further cooling. It should be noted that the powder outlet 213 of the fifth cyclone separator 21 is the second powder outlet.

[0054] When the separation and preheating device 20 disclosed in this embodiment of the utility model is working, the coal mine solid waste homogenized by the second homogenizing device 204 will enter the separation and preheating device 20 from the powder inlet 2691. Driven by the gas separated by the second cyclone separator 24, it will enter the first cyclone separator 25 through the ninth connecting pipe 269. The gas separated by the second cyclone separator 24 will preheat the coal mine solid waste powder entering the first cyclone separator 25. The coal mine solid waste powder separated by the first cyclone separator 25 will enter the second cyclone separator 24 through the seventh connecting pipe 267. The gas separated by the third cyclone separator 23 will be input into the seventh connecting pipe 267 and preheat the coal mine solid waste powder. The coal mine solid waste powder separated by the second cyclone separator 24 enters the third cyclone separator 23 through the fifth connecting pipe 265. The gas separated by the fourth cyclone separator 22 is input into the fifth connecting pipe 265 to preheat the coal mine solid waste powder. The coal mine solid waste powder separated by the third cyclone separator 23 enters the fourth cyclone separator 22 through the third connecting pipe 263. The gas separated by the fifth cyclone separator 21 is input into the third connecting pipe 263 to preheat the coal mine solid waste powder. The coal mine solid waste separated by the fourth cyclone separator 22 is then transported to the smoldering calciner 10 for smoldering calcination.

[0055] As can be seen from the above work, the high-temperature flue gas discharged from the smoldering calciner 10, after being separated into gas and solid by the fifth cyclone separator 21, will gradually rise, thereby preheating the coal mine solid waste powder entering the fourth cyclone separator 22, the third cyclone separator 23, the second cyclone separator 24 and the first cyclone separator 25 in sequence. This allows the coal mine solid waste powder input from the powder inlet 2691 into the separation preheating device 20 to be preheated multiple times during its downward movement, which ultimately improves the preheating effect and increases the waste heat utilization rate.

[0056] The structures and gas-solid separation principles of the fifth cyclone separator 21, the fourth cyclone separator 22, the third cyclone separator 23, the second cyclone separator 24, and the first cyclone separator 25 are well-known. The technical improvements of this embodiment do not lie in the cyclone separators themselves, and therefore will not be elaborated upon here. To prevent the backflow of coal mine solid waste powder discharged from the powder outlets of the fifth cyclone separator 21, the fourth cyclone separator 22, the third cyclone separator 23, the second cyclone separator 24, and the first cyclone separator 25, anti-backflow valves can be installed at the powder outlets or corresponding connecting pipes of the fifth cyclone separator 21, the fourth cyclone separator 22, the third cyclone separator 23, the second cyclone separator 24, and the first cyclone separator 25, thereby ensuring that the coal mine solid waste powder discharged from the powder outlets flows in the required direction.

[0057] The coal mine solid waste treatment system disclosed in this embodiment of the present invention may further include an iron removal device 40. The powder outlet 213 of the fifth cyclone separator 21 is connected to the cooling device 30 through the iron removal device 40, which is used to remove reduced iron from the calcined coal mine solid waste powder.

[0058] In this embodiment of the present invention, the cooling device 30 may have various structures, and the present invention does not limit the specific structure of the cooling device 30. In one embodiment, the cooling device 30 may include a sixth cyclone separator 31, a first cooling body 32, and a first blower 33.

[0059] The sixth cyclone separator 31 has a gas-solid separation function. The air outlet 311 of the sixth cyclone separator 31 is connected to the air inlet 013 of the smoldering calciner 10. The powder outlet 312 of the sixth cyclone separator 31 is connected to the powder inlet 321 of the first cooling body 32. The air outlet 322 of the first cooling body 32 is connected to the air inlet 313 of the sixth cyclone separator 31. The air inlet 323 of the first cooling body 32 is connected to the first blower 33. The powder outlet of the first cooling body 32 is connected to the first powder finished product discharge pipe 34.

[0060] In the specific working process, the first blower 33 inputs cooling air into the first cooling body 32. The cooling air enters the first cooling body 32 and exchanges heat with the coal mine solid waste powder there. After being heated, the cooling air is transported to the sixth cyclone separator 31 to exchange heat with the coal mine solid waste powder that is about to enter the first cooling body 32. In this case, the cooling air exchanges heat with the coal mine solid waste powder in the first cooling body 32 and the sixth cyclone separator 31 respectively, and its temperature rises before being sent to the smoldering calciner 10 to participate in combustion. Since the air participating in the calcination in the smoldering calciner 10 is formed by heating the cooling air, the heated cooling air helps to improve the calcination efficiency of the smoldering calciner 10. Moreover, the coal mine solid waste powder separated from the fifth cyclone separator 21 will pass through the sixth cyclone separator 31 and the first cooling body 32 in sequence for multi-stage cooling, which helps to improve the cooling efficiency. After being cooled by the first cooling unit 32, the coal mine solid waste powder will enter the seventh cyclone separator 35, and the residual material will be discharged from the first powder finished product discharge pipe 34.

[0061] In other embodiments, the cooling device 30 disclosed in this utility model embodiment may further include a seventh cyclone separator 35, a second cooling body 36, and a second blower 37.

[0062] The air inlet 351 of the seventh cyclone separator 35 is connected to the air outlet 322 of the first cooling body 32, and the air outlet 352 of the seventh cyclone separator 35 is connected to the air inlet 313 of the sixth cyclone separator 31, thereby achieving indirect connection between the air outlet 322 of the first cooling body 32 and the air inlet 313 of the sixth cyclone separator 31. The seventh cyclone separator 35 can also prevent some of the coal mine solid waste powder that has been cooled by the first cooling body 32 from being carried back into the sixth cyclone separator 31 by the cooling air.

[0063] The seventh cyclone separator 35 performs gas-solid separation on the cooled air and coal mine solid waste powder discharged from the first cooling body 32 after heat exchange. The powder outlet 353 of the seventh cyclone separator 35 is connected to the powder inlet 361 of the second cooling body 36. The air inlet 362 of the second cooling body 36 is connected to the second blower 37. The powder outlet 363 of the second cooling body 36 is connected to the second powder finished product discharge pipe 38.

[0064] In the specific working process, the second blower 37 inputs cooling air into the second cooling body 36. The cooling air enters the second cooling body 36 and exchanges heat with the coal mine solid waste powder inside, cooling it down. After being cooled, the coal mine solid waste powder in the second cooling body 36 enters the eighth cyclone separator 39, and the residual material can be discharged from the second powder finished product discharge pipe 38. It should be noted that the coal mine solid waste powder in the second cooling body 36 is generated after gas-solid separation in the seventh cyclone separator 35.

[0065] In a further embodiment, the cooling device 30 may also include an eighth cyclone separator 39, the air inlet 391 of which is connected to the air outlet 364 of the second cooling body 36. The powder outlet 392 of the eighth cyclone separator 39 may be connected to a third powder finished product discharge pipe 310.

[0066] Cooling air is delivered by the second blower 37 to the second cooling body 36 to exchange heat with the coal mine solid waste powder inside the second cooling body 36. The cooling air is discharged from the second cooling body 36 carrying the coal mine solid waste powder. The air inlet 391 of the eighth cyclone separator 39 is connected to the air outlet 364 of the second cooling body 36, thereby enabling gas-solid separation of the cooling air discharged from the second cooling body 36 and the coal mine solid waste powder, thus separating the coal mine solid waste powder carried by the cooling air, and finally discharging it through the third powder finished product discharge pipe 310.

[0067] To minimize environmental impact, the coal mine solid waste treatment system disclosed in this embodiment of the invention includes a dust collector 50. The dust collector 50's inlet 51 is connected to the outlet 393 of the eighth cyclone separator 39, and its outlet 52 is connected to the atmospheric environment. The dust collector 50's powder outlet 53 is connected to a fourth powder finished product discharge pipe 54. The dust collector 50 can remove dust from the cooling air separated by the eighth cyclone separator 39. The coal mine solid waste powder collected during the dust removal process can be discharged through the fourth powder finished product discharge pipe 54. The cooling air after dust removal by the dust collector 50 is ultimately discharged into the atmosphere.

[0068] To improve the discharge efficiency of finished powder materials, there can be at least two finished powder material discharge pipes: the first finished powder material discharge pipe 34, the second finished powder material discharge pipe 38, the third finished powder material discharge pipe 310, and the fourth finished powder material discharge pipe 54.

[0069] As described above, in the specific working process, the first powder finished product discharge pipe 34, the second powder finished product discharge pipe 38, the third powder finished product discharge pipe 310, and the fourth powder finished product discharge pipe 54 can all realize the discharge of powder finished products. In order to realize the conveying of powder finished products to the powder finished product packaging equipment 03, the coal mine solid waste powder suspension calcination equipment disclosed in this utility model embodiment may further include powder finished product conveying equipment 60. In one embodiment, there can be multiple powder finished product conveying equipment 60. The first powder finished product discharge pipe 34, the second powder finished product discharge pipe 38, the third powder finished product discharge pipe 310, and the fourth powder finished product discharge pipe 54 can each be configured with powder finished product conveying equipment 60, and the powder finished products are conveyed to the powder finished product packaging equipment 03 through the corresponding powder finished product conveying equipment 60.

[0070] To simplify the system structure, in another embodiment, the first powder finished product discharge pipe 34, the second powder finished product discharge pipe 38, the third powder finished product discharge pipe 310, and the fourth powder finished product discharge pipe 54 are sequentially distributed along the conveying direction of the powder finished product conveying device 60. This distribution facilitates the sharing of the powder finished product conveying device 60 by the first powder finished product discharge pipe 34, the second powder finished product discharge pipe 38, the third powder finished product discharge pipe 310, and the fourth powder finished product discharge pipe 54, thereby enabling the conveying requirements of the powder finished product to be met with fewer powder finished product conveying devices 60. Because the number of powder finished product conveying devices 60 is small, the structure of the coal mine solid waste powder suspension calcination device 01 can be simplified, and the manufacturing cost of the coal mine solid waste powder suspension calcination device 01 can be reduced.

[0071] The coal mine solid waste treatment system disclosed in this embodiment of the utility model may further include a powder product homogenization device 70, which is connected to the outlet of the powder product conveying equipment 60 for homogenizing the received powder product, thereby improving the quality of the powder product; and a powder product packaging equipment 03 is connected to the powder outlet of the powder product homogenization device 70 for packaging the homogenized powder product.

[0072] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A coal mine solid waste powder suspension calcination equipment, characterized in that, The device comprises a smoldering calcinator (10), a separation preheating device (20) and a cooling device (30), wherein The powder inlet of the separation preheating device (20) is used for receiving and preheating the coal mine solid waste powder; the powder inlet (011) of the smoldering calcinator (10) is communicated with the first powder outlet of the separation preheating device (20) to smolder and calcine the preheated coal mine solid waste powder discharged from the first powder outlet; The air outlet (012) of the smoldering calcinator (10) is communicated with the air inlet of the separation preheating device (20) to transport the high-temperature flue gas containing the smoldered coal mine solid waste powder into the separation preheating device (20) for heat exchange and gas-solid separation; the separation preheating device (20) has a second powder outlet communicated with the powder inlet (031) of the cooling device (30) to transport the calcined and gas-solid separated coal mine solid waste powder into the cooling device (30) for cooling.

2. The coal mine solid waste powder suspension calcination equipment according to claim 1, characterized in that, The separation preheating device (20) comprises a fifth cyclone separator (21), a fourth cyclone separator (22), a third cyclone separator (23), a second cyclone separator (24) and a first cyclone separator (25) arranged in sequence above the smoldering calcinator (10); the air inlet (211) of the fifth cyclone separator (21) is communicated with the air outlet (012) of the smoldering calcinator (10) through a first connecting pipe (261) to allow the high-temperature flue gas discharged from the smoldering calcinator (10) to enter the fifth cyclone separator (21); the powder outlet (221) of the fourth cyclone separator (22) is communicated with the powder inlet (011) of the smoldering calcinator (10) through a second connecting pipe (262) to transport the coal mine solid waste powder flowing through the fourth cyclone separator (22) into the smoldering calcinator (10), and the powder outlet (221) of the fourth cyclone separator (22) is the first powder outlet. The powder outlet (231) of the third cyclone separator (23) is communicated with the powder inlet (222) of the fourth cyclone separator (22) through a third connecting pipe (263) to convey the coal mine solid waste powder flowing through the third cyclone separator (23) into the fourth cyclone separator (22), the air outlet (212) of the fifth cyclone separator (21) is communicated with the third connecting pipe (263) through a fourth connecting pipe (264) to drive the coal mine solid waste powder into the fourth cyclone separator (22) by the high-temperature flue gas and preheat the coal mine solid waste powder by the high-temperature flue gas; the powder outlet (241) of the second cyclone separator (24) is communicated with the powder inlet (232) of the third cyclone separator (23) through a fifth connecting pipe (265) to convey the coal mine solid waste powder flowing through the second cyclone separator (24) into the third cyclone separator (23); The air outlet (223) of the fourth cyclone separator (22) is communicated with the fifth connecting pipe (265) through a sixth connecting pipe (266) to drive the coal mine solid waste powder into the third cyclone separator (23) by the high-temperature flue gas and preheat the coal mine solid waste powder by the high-temperature flue gas; the powder outlet (251) of the first cyclone separator (25) is communicated with the powder inlet (242) of the second cyclone separator (24) through a seventh connecting pipe (267) to convey the coal mine solid waste powder flowing through the first cyclone separator (25) into the second cyclone separator (24), the air outlet (233) of the third cyclone separator (23) is communicated with the seventh connecting pipe (267) through an eighth connecting pipe (268) to drive the coal mine solid waste powder into the second cyclone separator (24) by the high-temperature flue gas and preheat the coal mine solid waste powder by the high-temperature flue gas; the air outlet (243) of the second cyclone separator (24) is communicated with the air inlet (252) of the first cyclone separator (25) through a ninth connecting pipe (269), the ninth connecting pipe (269) is provided with a powder input port (2691), the powder input port (2691) is a powder inlet of the separation and preheating device (20), so that the coal mine solid waste powder entering from the powder input port (2691) enters the first cyclone separator (25) under the driving of the high-temperature flue gas, the powder outlet (213) of the fifth cyclone separator (21) is communicated with the cooling device (30), and the powder outlet (213) of the fifth cyclone separator (21) is a second powder outlet.

3. The coal mine solid waste powder suspension calcination equipment according to claim 2, characterized in that, The coal mine solid waste powder suspension calcination equipment further comprises an iron removal device (40); a powder outlet (213) of the fifth cyclone separator (21) is communicated with the cooling device (30) through the iron removal device (40), and the iron removal device (40) is used for performing an iron removal operation on reduced iron in the calcined coal mine solid waste powder.

4. The coal mine solid waste powder suspension calcination equipment according to claim 1, characterized in that, The cooling device (30) comprises a sixth cyclone separator (31), a first cooling main body (32) and a first air blower (33). An air outlet (311) of the sixth cyclone separator (31) is communicated with an air inlet (013) of the smoldering calcination furnace (10); a powder outlet (312) of the sixth cyclone separator (31) is communicated with a powder inlet (321) of the first cooling main body (32); an air outlet (322) of the first cooling main body (32) is communicated with an air inlet (313) of the sixth cyclone separator (31); the air inlet (323) of the first cooling main body (32) is connected with the first air blower (33); and a powder outlet of the first cooling main body (32) is connected with a first powder finished product discharge pipe (34).

5. The coal mine solid waste powder suspension calcination equipment according to claim 4, characterized in that, The cooling device (30) further comprises a seventh cyclone separator (35), a second cooling main body (36) and a second air blower (37); an air inlet (351) of the seventh cyclone separator (35) is communicated with the air outlet (322) of the first cooling main body (32), and an air outlet (352) of the seventh cyclone separator (35) is communicated with the air inlet (313) of the sixth cyclone separator (31); a powder outlet (353) of the seventh cyclone separator (35) is communicated with a powder inlet (361) of the second cooling main body (36); an air inlet (362) of the second cooling main body (36) is connected with the second air blower (37); and a powder outlet (363) of the second cooling main body (36) is connected with a second powder finished product discharge pipe (38).

6. The coal mine solid waste powder suspension calcination equipment according to claim 5, characterized in that, The cooling device (30) further comprises an eighth cyclone separator (39); an air inlet (391) of the eighth cyclone separator (39) is communicated with an air outlet (364) of the second cooling main body (36); and a powder outlet (392) of the eighth cyclone separator (39) is connected with a third powder finished product discharge pipe (310).

7. The coal mine solid waste powder suspension calcination equipment according to claim 6, characterized in that, The coal mine solid waste powder suspension calcination equipment further comprises a dust remover (50); an air inlet (51) of the dust remover (50) is communicated with an air outlet (393) of the eighth cyclone separator (39); and an air outlet (52) of the dust remover (50) is communicated with an atmospheric environment.

8. The coal mine solid waste powder suspension calcination equipment according to claim 7, characterized in that, A powder outlet (53) of the dust remover (50) is connected with a fourth powder finished product discharge pipe (54). A powder outlet (53) of the dust remover (50) is connected with a fourth powder finished product discharge pipe (54).

9. The coal mine solid waste powder suspension calcination equipment according to claim 8, characterized in that, The coal mine solid waste powder suspension calcination equipment further comprises a powder finished product conveying device (60); the first powder finished product discharge pipe (34), the second powder finished product discharge pipe (38), the third powder finished product discharge pipe (310) and the fourth powder finished product discharge pipe (54) are sequentially distributed along the conveying direction of the powder finished product conveying device (60).

10. A coal mine solid waste treatment system, characterized by, The coal mine solid waste powder suspension calcination equipment (01) comprises a pulverizing device (02) and the coal mine solid waste powder suspension calcination equipment (01) according to any one of claims 1-9, and a powder outlet of the pulverizing device (02) is communicated with a powder inlet of the separation preheating device (20).

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