Coal mine solid waste treatment system

Abstract

The utility model discloses a coal mine solid waste treatment system which comprises powder making equipment, coal mine solid waste powder suspension calcining equipment and powder finished product packaging equipment, the pulverizing equipment comprises a crushing device, a first homogenizing device, a grinding device and a second homogenizing device which are connected in sequence; the coal mine solid waste powder suspension calcining equipment comprises a smoldering calcining furnace, a separation preheating device and a cooling device, a powder inlet of the separating and preheating device is connected with the second homogenizing device; a powder inlet of the smoldering calcining furnace is communicated with a first powder outlet of the separation preheating device; an air outlet of the smoldering calcining furnace is communicated with an air inlet of the separation preheating device; the separation preheating device is provided with a second powder outlet, and the second powder outlet is communicated with the powder inlet of the cooling device; and the powder finished product packaging equipment is connected with a powder outlet of the cooling device. According to the scheme, the problems that the interior is insufficient, the exterior is overburnt and the energy consumption is high when the coal mine solid waste is calcined and activated can be solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coal mine solid waste treatment, and particularly relates to a coal mine solid waste treatment system. BACKGROUND

[0002] In the process of raw coal mining, 100-250 kg of coal mine solid waste (i.e. coal series kaolin) is generated per ton of raw coal mined. A large amount of coal mine solid waste not only occupies land, but also wastes resources. At present, the utilization rate of coal mine solid waste is relatively low, usually below 20%. At present, there is no large-scale successful application for a large amount of coal mine solid waste. A few scholars or enterprises attempt to prepare microcrystalline glass, silicon aluminum oxide, ceramic matrix material, aggregate, cement product, etc., but most of the coal mine solid waste has not been reused on a large scale because of the high disposal cost or poor product quality.

[0003] The coal mine solid waste is inertized by itself. The inertization characteristics of the coal mine solid waste caused by the long generation age, weathering, deposition and other reactions of the minerals make the coal mine solid waste insoluble or hardly soluble in acid or alkaline solution. Therefore, in order to extract valuable minerals or chemicals in the coal mine solid waste, an activation process is needed to destroy the stable crystal structure and mineral structure of the coal mine solid waste, so as to make the crystal cell lack and develop the original characteristics of the coal mine solid waste, thereby extracting valuable mineral elements. Calcination of the coal mine solid waste is a necessary means to realize activation.

[0004] Calcination and activation of the coal mine solid waste is an important process for the reuse of the coal mine solid waste. In the related technology, the calcination is usually carried out in a stacked state. Generally, granular or blocky coal mine solid waste is used in the stacked state in the calcination kiln. However, the coal mine solid waste with a large particle size is in a stacked state, and the thermal conductivity coefficient of the coal mine solid waste is low. Not only is there a problem of small contact area between the coal mine solid waste and the hot gas flow and low heat exchange efficiency, but also the internal under-burning and external over-burning of the blocky coal mine solid waste are caused by the large temperature difference between the inside and outside of the blocky coal mine solid waste, which seriously affects the quality and activity of the final calcined product. At the same time, the small contact area between the coal mine solid waste and the hot gas flow leads to the problem of high energy consumption in the calcination and activation of the coal mine solid waste. CONTENT OF THE INVENTION

[0005] The application discloses a coal mine solid waste treatment system to solve the problems of internal under-burning and external over-burning and high energy consumption in the calcination and activation of the coal mine solid waste in the related technology.

[0006] In order to solve the above technical problems, the application provides the following technical solutions:

[0007] A coal mine solid waste treatment system comprises a pulverizing device, a coal mine solid waste powder suspension calcination device and a powder finished product packaging device.

[0008] The pulverizing device comprises a crushing device, a first homogenizing device, a pulverizing device and a second homogenizing device connected in sequence; the crushing device is used for crushing large pieces of coal mine solid waste to obtain small pieces of coal mine solid waste; the first homogenizing device is used for primary homogenization of the small pieces of coal mine solid waste; the pulverizing device is used for pulverizing the small pieces of coal mine solid waste after primary homogenization to obtain coal mine solid waste powder; and the second homogenizing device is used for secondary homogenization of the coal mine solid waste powder.

[0009] The coal mine solid waste powder suspension calcination device comprises a smoldering calcination furnace, a separation preheating device and a cooling device.

[0010] The powder inlet of the separation preheating device is connected with the second homogenizing device to receive and preheat the coal mine solid waste powder without preheating; the powder inlet of the smoldering calcination furnace is communicated with the first powder outlet of the separation preheating device to smolder and calcine the coal mine solid waste powder preheated and discharged from the first powder outlet.

[0011] The air outlet of the smoldering calcination furnace is communicated with 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 communicated with the powder inlet of the cooling device to transport the coal mine solid waste powder after gas-solid separation to the cooling device for cooling.

[0012] The powder finished product packaging device is connected with at least the powder outlet of the cooling device to receive and package the powder finished product.

[0013] In the embodiment of the utility model, the coal mine solid waste is first made into coal mine solid waste powder (i.e. coal mine solid waste in powder form) by the powder making equipment, and then the coal mine solid waste powder is calcined and activated by the coal mine solid waste powder suspension calcining equipment. 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, so that the dehydroxylation reaction speed of the coal mine solid waste is faster, and a more efficient decomposition reaction is achieved, which is finally conducive to improving the calcination and activation efficiency. At the same time, the coal mine solid waste is made into coal mine solid waste powder to realize suspension combustion, so that the coal mine solid waste powder can be more evenly and fully combusted during the calcination and activation process, and the adverse phenomena such as internal under-burning and external over-burning of the blocky structure of the coal mine solid waste during the calcination of the blocky coal mine solid waste accumulation can be effectively avoided. Moreover, since the heat transfer efficiency between the powders is high during the calcination and activation process, the heat utilization efficiency can be improved, and the energy consumption of the calcination and activation can be reduced. The coal mine solid waste powder suspension calcining equipment can be configured with a separation preheating device to realize the reuse of waste heat during the calcination process. The separation preheating device fully utilizes the preheating of high-temperature flue gas to preheat the uncalcined coal mine solid waste powder, thereby reducing the energy consumption in the subsequent calcination process. Moreover, the preheated coal mine solid waste powder can undergo more complete decomposition reaction, which is conducive to improving the calcination and activation effect. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is the structure schematic view of the coal mine solid waste treatment system disclosed in the embodiment of the utility model;

[0015] Fig. 2 is the structure schematic view of the powder making equipment disclosed in the embodiment of the utility model;

[0016] Fig. 3 is the structure schematic view of the coal mine solid waste powder suspension calcining equipment disclosed in the embodiment of the utility model;

[0017] Fig. 4 is the partial structure schematic view of the coal mine solid waste treatment system disclosed in the embodiment of the utility model.

[0018] BRIEF DESCRIPTION OF DRAWINGS:

[0019] 01-coal mine solid waste powder suspension calcining equipment, 02-powder making equipment, 03-powder product packaging equipment, 201-crushing device, 202-first homogenizing device, 203-powder grinding device, 204-second homogenizing device, 2011-plate feeder, 2012-wave roller feeder, 2013-hammer crusher, 205-metering feeding device,

[0020] 10-cathode calcining furnace, 011-powder inlet, 012-outlet, 013-inlet,

[0021] 20-separation preheating device, 21-fifth cyclone separator, 211-inlet, 212-outlet, 213-powder outlet, 22-fourth cyclone separator, 221-powder outlet, 222-powder inlet, 223-outlet, 23-third cyclone separator, 231-powder outlet, 232-powder inlet, 233-outlet, 24-second cyclone separator, 241-powder outlet, 242-powder inlet, 243-outlet, 25-first cyclone separator, 251-powder outlet, 252-inlet, 261-first connecting pipe, 262-second connecting pipe, 263-third connecting pipe, 264-fourth connecting pipe, 265-fifth connecting pipe, 266-sixth connecting pipe, 267-seventh connecting pipe, 268-eighth connecting pipe, 269-ninth connecting pipe, 2691-powder input,

[0022] 30-cooling device, 031-powder inlet, 31-sixth cyclone separator, 311-outlet, 312-powder outlet, 313-inlet, 32-first cooling main body, 321-powder inlet, 322-outlet, 323-inlet, 33-first air blower, 34-first powder finished product discharge pipe, 35-seventh cyclone separator, 351-inlet, 352-outlet, 353-powder outlet, 36-second cooling main body, 361-powder inlet, 362-inlet, 363-powder outlet, 364-outlet, 37-second air blower, 38-second powder finished product discharge pipe, 39-eighth cyclone separator, 391-inlet, 392-powder outlet, 393-outlet, 310-third powder finished product discharge pipe,

[0023] 40-iron removal device,

[0024] 50-dust collector, 51-inlet, 52-outlet, 53-powder outlet, 54-fourth powder finished product discharge pipe,

[0025] 60-powder finished product conveying equipment, 70-powder finished product homogenizing device. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely below in combination with the embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without making creative efforts fall within the protection scope of the present application.

[0027] The technical scheme disclosed in the various embodiments of the utility model is described in detail below with reference to the drawings.

[0028] Please refer to Figs. 1 to 4 The utility model discloses a coal mine solid waste processing system. The disclosed coal mine solid waste processing system comprises a coal mine solid waste powder suspension calcination equipment 01, a powder making equipment 02 and a powder product packaging equipment 03.

[0029] The powder making equipment 02 is used at least for making the coal mine solid waste into powder, that is, forming the coal mine solid waste powder. The coal mine solid waste powder suspension calcination equipment 01 is connected with the powder making equipment 02, and is used for suspending and calcining the coal mine solid waste powder, so as to finally form the powder product.

[0030] The powder product packaging equipment 03 is connected with the coal mine solid waste powder suspension calcination equipment 01, and is used for packaging the powder product.

[0031] The main component kaolinite of the coal mine solid waste can generate high-activity metakaolin after dehydroxylation at a proper temperature. In the present application, the powder product formed after calcination by the coal mine solid waste powder suspension calcination equipment 01 is actually metakaolin powder. The calcination of the coal mine solid waste is an endothermic reaction. When the temperature rises to about 300 DEG C, kaolinite begins to decompose to generate metakaolin and water vapor. With the further increase of the temperature, the decomposition rate will accelerate, and the decomposition basically ends when the temperature is above 800 DEG C. The decomposition reaction rate of the coal mine solid waste is mainly affected by the calcination temperature and the particle size. In the utility model embodiment, the powder making equipment 02 first makes the blocky coal mine solid waste into coal mine solid waste powder (that is, the coal mine solid waste in powder form), and then calcines and activates the coal mine solid waste powder by 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 in the process of calcination and activation, so that the dehydroxylation reaction rate of the coal mine solid waste is faster, the decomposition reaction is more efficient, and finally the calcination and activation efficiency is improved.

[0032] At the same time, the blocky coal mine solid waste is made into coal mine solid waste powder to realize suspension combustion, so that the coal mine solid waste powder can be uniformly and fully combusted in the process of calcination and activation, and the adverse phenomena such as internal under-burning and external over-burning of the blocky structure of the blocky coal mine solid waste when the blocky coal mine solid waste is stacked and calcined can be effectively avoided. Moreover, since the heat transfer efficiency between the powders is high in the process of calcination and activation, the heat utilization efficiency can be improved, and the energy consumption of calcination and activation can be reduced.

[0033] In the embodiments of the present application, the structure of the pulverizing device 02 can be various, for example, the pulverizing device 02 only includes a grinding machine, so as to grind the lumped coal mine solid waste into coal mine solid waste powder. Considering that the lumped volume of the coal mine solid waste is large and is not easy to be directly ground in the raw coal mining process. In other embodiments, the pulverizing device 02 can include a crushing device 201, a first homogenizing device 202, a grinding device 203 and a second homogenizing device 204 connected in sequence.

[0034] The crushing device 201 is used for crushing the large lumped coal mine solid waste to obtain small lumped coal mine solid waste. The first homogenizing device 202 is used for primary homogenization of the small lumped coal mine solid waste. The grinding device 203 is used for grinding the small lumped coal mine solid waste after primary homogenization to obtain coal mine solid waste powder. The second homogenizing device 204 is used for secondary homogenization of the coal mine solid waste powder.

[0035] The pulverizing device 02 with such a structure first crushes the large lumped coal mine solid waste by the crushing device 201, thereby facilitating to reduce the subsequent grinding load of the grinding device 203. At the same time, the small lumped coal mine solid waste is primary homogenized by the first homogenizing device 202 before grinding, which is beneficial to the subsequent grinding device 203 to grind more evenly. After the grinding device 203 grinds the small lumped coal mine solid waste, the formed coal mine solid waste powder is secondary homogenized, so that the coal mine solid waste is homogenized, which is beneficial to the subsequent calcination of the coal mine solid waste powder suspension calcination device 01.

[0036] In the embodiments of the present application, the coal mine solid waste powder suspension calcination device 10 can include a smoldering calcination furnace 10, a separation preheating device 20 and a cooling device 30.

[0037] The separation preheating device 20 is at least used for preheating the coal mine solid waste powder. The powder inlet of the separation preheating device 20 is connected with the second homogenizing device 204, so as to receive the coal mine solid waste powder after secondary homogenization and preheat it.

[0038] The powder inlet 011 of the smoldering calcination furnace 10 is communicated with the first powder outlet of the separation preheating device 20, so as to smoldering calcine the preheated coal mine solid waste powder discharged from the first powder outlet. The smoldering calcination furnace 10 adopts the smoldering calcination mode, which does not produce open fire, and is beneficial to realize uniform heating and calcination of the coal mine solid waste powder and improve the uniformity of calcination activation. The air outlet 012 of the smoldering calcination furnace 10 is communicated with the air inlet of the separation preheating device 20, so as to transport the high-temperature flue gas containing the coal mine solid waste powder after smoldering calcination into the separation preheating device 20 for gas-solid separation. The gas after gas-solid separation enters the separation preheating device 20 to preheat the coal mine solid waste powder not subjected to calcination in the separation preheating device 20, so that the coal mine solid waste powder not subjected to calcination enters the smoldering calcination furnace 10 at a high temperature, and the preheating is beneficial to calcination and can reduce the energy consumption in the calcination process.

[0039] Therefore, in the coal mine solid waste treatment system disclosed in the embodiment of the utility model, the coal mine solid waste powder suspension calcination equipment 01 can realize the reuse of waste heat in the calcination process by configuring the separation preheating device 20, the separation preheating device 20 fully utilizes the waste heat of the high-temperature flue gas to preheat the coal mine solid waste powder not subjected to calcination, so as to reduce the energy consumption in the subsequent calcination process, and the preheated coal mine solid waste powder can have a more sufficient decomposition reaction, which is beneficial to improve the calcination activation effect.

[0040] The separation preheating device 20 has a second powder outlet, which is communicated with the powder inlet 031 of the cooling device 30, so as to transport the coal mine solid waste powder after gas-solid separation into the cooling device 30 for cooling. The coal mine solid waste powder after gas-solid separation enters the cooling device 30 through the second powder outlet and is cooled by the cooling device 30 to form a powder finished product. The cooling device 30 is used for cooling the coal mine solid waste powder after calcination, and the type of the cooling device 30 can be various, for example, the cooling device 30 can be a forced air cooling device, a liquid cooling device or other device for cooling through heat exchange, and the embodiment of the utility model does not limit the specific type of the cooling device 30.

[0041] The powder finished product packaging equipment 03 is connected with at least the powder outlet of the cooling device 30, so as to receive the powder finished product and package it. In the embodiment of the utility model, the powder finished product packaging equipment 03 can bag the powder finished product, box the powder finished product or barrel the powder finished product, and the embodiment of the utility model 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 an existing device, and its structure, packaging process and packaging principle are known, which will not be described here.

[0042] In the embodiment of the utility model, the structure of the crushing device 201 can be various, in an embodiment, the crushing device 201 can include the plate feeder 2011, the wave roller feeder 2012 and the hammer crusher 2013 connected in sequence. The hammer crusher 2013 is communicated with the first homogenizing device 202, for conveying the small lump coal mine solid waste prepared into the first homogenizing device 202. The plate feeder 2011 and the wave roller feeder 2012 sequentially convey the large lump coal mine solid waste, finally make the large lump coal mine solid waste enter the hammer crusher 2013 to be crushed and form the small lump coal mine solid waste.

[0043] In the embodiment of the utility model, the grinding device 203 can be a vertical mill equipment, of course, can also be other kinds of equipment capable of grinding the small lump coal mine solid waste into powder, the embodiment of the utility model does not limit the specific type of the grinding device 203.

[0044] In order to implement more accurate feeding to the separation preheating device 20, in a more specific embodiment, the powder making equipment 02 disclosed by the embodiment of the utility model can also include a metering feeding device 205. The metering feeding device 205 is communicated with the powder outlet of the second homogenizing device 204 and the powder inlet of the separation preheating device 20, for feeding to the separation preheating device 20 according to the preset feeding amount. The metering feeding device 205 can realize quantitative feeding according to the preset feeding amount, so as to make the powder conveying to the separation preheating device 20 more controllable.

[0045] The structure of the separation preheating device 20 can be various, as long as the high-temperature flue gas containing the coal mine solid waste powder after smoldering calcination produced by the smoldering calcination furnace 10 can be gas-solid separated, and the gas produced by the gas-solid separation can preheat the coal mine solid waste powder entering the separation preheating device 20. For example, the separation preheating device 20 can be provided with a gas passage for the high-temperature gas produced by the gas-solid separation to flow through, and can be provided with a powder passage for the coal mine solid waste powder to flow, after the high-temperature flue gas is gas-solid separated, the high-temperature gas enters the gas passage, and the unheated coal mine solid waste enters the powder passage, heat exchange can be carried out through the separation preheating device 20 in the process of the flow of the high-temperature gas and the flow of the unheated coal mine solid waste powder, so as to achieve the purpose of preheating the coal mine solid waste powder, finally achieve the purpose of waste heat utilization and improving the calcination efficiency.

[0046] Another specific separation preheating device 20 is disclosed in the embodiment of the utility model, the disclosed separation preheating device 20 can include 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 arranged in sequence above the smoldering calcination furnace 10.

[0047] Such a distribution manner is conducive to the upward flow of high-temperature flue gas discharged from the smoldering calcinator 10, and then the gas formed after the gas-solid separation of the high-temperature flue gas directly or indirectly 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 in turn.

[0048] Specifically, the air inlet 211 of the fifth cyclone separator 21 is communicated with the air outlet 012 of the smoldering calcinator 10 through the first connecting pipe 261, so that the high-temperature flue gas discharged from the smoldering calcinator 10 enters the fifth cyclone separator 21. The fifth cyclone separator 21 has a separation function, so that the gas-solid separation of the high-temperature flue gas can be realized. The coal mine solid waste powder separated by the fifth cyclone separator 21 is the coal mine solid waste powder that has been calcined. 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.

[0049] The powder outlet 221 of the fourth cyclone separator 22 is communicated with the powder inlet 011 of the smoldering calcinator 10 through the second connecting pipe 262, so as to transport the coal mine solid waste powder flowing through the fourth cyclone separator 22 to the smoldering calcinator 10. The fourth cyclone separator 22 also has a gas-solid separation function, and 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 finally discharged to the smoldering calcinator 10. It should be noted that the powder outlet 221 of the fourth cyclone separator 22 is the first powder outlet.

[0050] The third cyclone separator 23 has a gas-solid separation function, and a powder outlet 231 of the third cyclone separator 23 is communicated with a powder inlet 222 of the fourth cyclone separator 22 through a third connecting pipe 263 to transport the coal mine solid waste powder flowing through the third cyclone separator 23 into the fourth cyclone separator 22, and an 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 gas and preheat the coal mine solid waste powder by high-temperature flue gas. In this case, the gas generated after the gas-solid separation of 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 to exchange heat, and then enters the fourth cyclone separator 22 to exchange heat again in the fourth cyclone separator 22 and finally is subjected to gas-solid separation in the fourth cyclone separator 22. Of course, the fourth connecting pipe 264 can also directly communicate the air outlet 212 of the fifth cyclone separator 21 with the fourth cyclone separator 22, so that the gas generated after the gas-solid separation of the fifth cyclone separator 21 is directly mixed and exchanged heat with the coal mine solid waste powder in the fourth cyclone separator 22 and finally is subjected to gas-solid separation in the fourth cyclone separator 22.

[0051] 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 transport the coal mine solid waste powder flowing through the second cyclone separator 24 into 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 into the third cyclone separator 23 through the fifth connecting pipe 265.

[0052] 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 gas and preheat the coal mine solid waste powder by gas. In this case, the gas generated after the gas-solid separation of the fourth cyclone separator 22 can also be used to drive the coal mine solid waste powder into the third cyclone separator 23, and can be mixed with the coal mine solid waste powder in advance to exchange heat, and then enters the third cyclone separator 23 to exchange heat again in the third cyclone separator 23 and finally is subjected to gas-solid separation in the third cyclone separator 23. Of course, the sixth connecting pipe 266 can also directly communicate the air outlet 223 of the fourth cyclone separator 22 with the third cyclone separator 23, so that the gas generated after the gas-solid separation of the fourth cyclone separator 22 is directly mixed and exchanged heat with the coal mine solid waste powder in the third cyclone separator 23 and finally is subjected to gas-solid separation in the third cyclone separator 23.

[0053] The powder outlet 251 of the first cyclone separator 25 is communicated with the powder inlet 241 of the second cyclone separator 24 through the seventh connecting pipe 267 to transport the coal mine solid waste powder in the first cyclone separator 25 to the second cyclone separator 24, and the first cyclone separator 25 has a gas-solid separation function, and the coal mine solid waste powder separated by the first cyclone separator 25 is transported to the second cyclone separator 24 through the seventh connecting pipe 267.

[0054] The air outlet 233 of the third cyclone separator 23 is communicated with the seventh connecting pipe 267 through the 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. 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 with the coal mine solid waste powder in advance for heating, and then enters the second cyclone separator 24 again, and is heat-exchanged again in the second cyclone separator 24 and finally subjected to gas-solid separation by the second cyclone separator 24. Of course, the eighth connecting pipe 268 can also directly communicate the air outlet 233 of the third cyclone separator 23 with the second cyclone separator 24, so that the gas generated after the gas-solid separation of the third cyclone separator 23 is directly mixed with the coal mine solid waste powder in the second cyclone separator 24 for heat exchange and finally subjected to gas-solid separation by the second cyclone separator 24.

[0055] The air outlet 242 of the second cyclone separator 24 is communicated with the air inlet 252 of the first cyclone separator 25 through the ninth connecting pipe 269, and the ninth connecting pipe 269 is provided with a powder input port 2691, which 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 gas, and the powder outlet 213 of the fifth cyclone separator 21 is communicated with the cooling device 30, and the coal mine solid waste powder after calcination generated after the gas-solid separation of the high-temperature flue gas through the fifth cyclone separator 21 enters the cooling device 30 through the powder outlet 213 for subsequent cooling. It should be noted that the powder outlet 213 of the fifth cyclone separator 21 is a second powder outlet.

[0056] The separation preheating device 20 disclosed in the embodiment of the utility model is in work, the coal mine solid waste after homogenization of second homogenizing device 204 can enter into separation preheating device 20 from powder input port 2691, under the drive of the gas separated out of second cyclone separator 24, enter into first cyclone separator 25 along ninth connecting pipe 269, the gas separated out of second cyclone separator 24 can preheat the coal mine solid waste powder entering into first cyclone separator 25, the coal mine solid waste powder separated out of first cyclone separator 25 can enter into second cyclone separator 24 through seventh connecting pipe 267, the gas separated out of third cyclone separator 23 can be input into seventh connecting pipe 267 and preheat the coal mine solid waste powder.

[0057] Through the above work, it can be known that the gas formed after the high-temperature flue gas discharged by the smoldering calcination furnace 10 is separated by the fifth cyclone separator 21, gradually goes up, thereby sequentially preheats 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, thereby making the coal mine solid waste powder input into the separation preheating device 20 from the powder input port 2691 be preheated multiple times in the process of descending, which ultimately can better improve the preheating effect and improve the waste heat utilization rate.

[0058] 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 known bases, and the technical improvement point of the embodiment of the utility model is not in the cyclone separator itself, therefore, details are not repeated here. In order to avoid the coal mine solid waste powder discharged from the powder outlet 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 backflow, an anti-backflow valve can be arranged on the powder outlet 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 or the corresponding connecting pipe, thereby ensuring that the coal mine solid waste powder discharged from the powder outlet flows in the required direction.

[0059] The coal mine solid waste treatment system disclosed by the embodiment of the utility model can further include a deironing device 40. The powder outlet 213 of the fifth cyclone separator 21 is communicated with the cooling device 30 through the deironing device 40, and the deironing device 40 is used for deironing the reduced iron in the calcined coal mine solid waste powder.

[0060] In the embodiment of the utility model, the structure of the cooling device 30 can be various, and the embodiment of the utility model does not limit the specific structure of the cooling device 30. In an embodiment, the cooling device 30 can include a sixth cyclone separator 31, a first cooling main body 32 and a first air blower 33.

[0061] The sixth cyclone separator 31 has a gas-solid separation function, and the air outlet 311 of the sixth cyclone separator 31 is communicated with the air inlet 013 of the smoldering calcining furnace 10; the powder outlet 312 of the sixth cyclone separator 31 is communicated with the powder inlet 321 of the first cooling main body 32; the air outlet 322 of the first cooling main body 32 is communicated with the 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 the powder outlet of the first cooling main body 32 is connected with the first powder finished product discharge pipe 34.

[0062] In the specific working process, the first air blower 33 inputs cooling air into the first cooling main body 32, the cooling air exchanges heat with the coal mine solid waste powder in the first cooling main body 32, and the cooling air is heated and then transported into the sixth cyclone separator 31 to exchange heat with the coal mine solid waste powder in the sixth cyclone separator 31, in which case, the cooling air exchanges heat with the coal mine solid waste powder in the first cooling main body 32 and the sixth cyclone separator 31 respectively, and the temperature of the cooling air is increased and then the cooling air is sent into the smoldering calcinator 10 to participate in combustion. Since the air participating in the calcination in the smoldering calcinator 10 is formed by heating the cooling air, the heated cooling air is beneficial to improve the calcination efficiency of the smoldering calcinator 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 main body 32 in turn for multi-stage cooling, thereby being beneficial to improve the cooling efficiency. The coal mine solid waste powder cooled by the first cooling main body 32 is discharged from the first powder product discharge pipe 34.

[0063] In other embodiments, the cooling device 30 disclosed in the embodiments of the utility model can further include a seventh cyclone separator 35, a second cooling main body 36 and a second air blower 37.

[0064] The air inlet 351 of the seventh cyclone separator 35 and the air outlet 322 of the first cooling main body 32 are communicated, the air outlet 352 of the seventh cyclone separator 35 and the air inlet 313 of the sixth cyclone separator 31 are communicated, thereby realizing the indirect communication between the air outlet 322 of the first cooling main body 32 and the air inlet 313 of the sixth cyclone separator 31. The seventh cyclone separator 35 can also prevent the part of the coal mine solid waste powder cooled by the first cooling main body 32 from being carried into the sixth cyclone separator 31 by the cooling air again.

[0065] The seventh cyclone separator 35 separates the cooling air exchanged heat from the first cooling main body 32 by gas-solid separation, the powder outlet 353 of the seventh cyclone separator 35 and the powder inlet 361 of the second cooling main body 36 are communicated, the air inlet 362 of the second cooling main body 36 is connected with the second air blower 37, and the powder outlet 363 of the second cooling main body 36 is connected with the second powder product discharge pipe 38.

[0066] In the specific working process, the second air blower 37 inputs cooling air into the second cooling main body 36, the cooling air exchanges heat with the coal mine solid waste powder in the second cooling main body 36 to cool the coal mine solid waste powder, and the cooled coal mine solid waste powder can be discharged from the second powder product discharge pipe 38. It should be noted that the coal mine solid waste powder in the second cooling main body 36 is generated after the gas-solid separation in the seventh cyclone separator 35.

[0067] In a further embodiment, the cooling device 30 can further include an eighth cyclone separator 39, and an air inlet 391 of the eighth cyclone separator 39 is in communication with an air outlet 364 of the second cooling main body 36. A powder outlet 392 of the eighth cyclone separator 39 can be connected with a third powder product discharge pipe 310.

[0068] The cooling air is transported into the second cooling main body 36 by the second air blower 37 to exchange heat with the coal mine solid waste powder in the second cooling main body 36 to cool the coal mine solid waste powder, and the cooling air discharged from the second cooling main body 36 can carry part of the coal mine solid waste powder. The air inlet 391 of the eighth cyclone separator 39 is in communication with the air outlet 364 of the second cooling main body 36, so that the cooling air discharged from the second cooling main body 36 can be subjected to gas-solid separation, and the coal mine solid waste powder carried by the cooling air can be separated out and finally discharged through the third powder product discharge pipe 310.

[0069] In order to reduce the impact on the environment, in the coal mine solid waste treatment system disclosed in the embodiment of the utility model, the coal mine solid waste powder suspension calcination equipment further includes a dust collector 50, an air inlet 51 of the dust collector 50 is in communication with an air outlet 393 of the eighth cyclone separator 39, an air outlet 52 of the dust collector 50 is in communication with the atmosphere, and a powder outlet 53 of the dust collector 50 is connected with a fourth powder product discharge pipe 54. The dust collector 50 can perform dust removal on the cooling air separated out by the eighth cyclone separator 39, the coal mine solid waste powder collected in the dust removal process can be discharged through the fourth powder product discharge pipe 54, and the cooling air after the dust removal operation of the dust collector 50 is finally discharged into the atmosphere.

[0070] In order to improve the discharge efficiency of the powder product, the first powder product discharge pipe 34, the second powder product discharge pipe 38, the third powder product discharge pipe 310 and the fourth powder product discharge pipe 54 can each be at least two, so as to improve the discharge efficiency.

[0071] As described above, in the specific working process, the first powder product discharge pipe 34, the second powder product discharge pipe 38, the third powder product discharge pipe 310 and the fourth powder product discharge pipe 54 can all realize the discharge of the powder product. In order to realize the conveying of the powder product to the powder product packaging device 03, the coal mine solid waste powder suspension calcining device disclosed in the embodiment of the present application can further comprise a powder product conveying device 60. In one embodiment, the powder product conveying device 60 can be multiple, and the first powder product discharge pipe 34, the second powder product discharge pipe 38, the third powder product discharge pipe 310 and the fourth powder product discharge pipe 54 can all be separately configured with the powder product conveying device 60, and the powder product is conveyed into the powder product packaging device 03 through the corresponding powder product conveying device 60.

[0072] In order to simplify the structure of the system, in another embodiment, the first powder product discharge pipe 34, the second powder product discharge pipe 38, the third powder product discharge pipe 310 and the fourth powder product discharge pipe 54 are sequentially distributed along the conveying direction of the powder product conveying device 60. Such a distribution mode is conducive to realizing that the first powder product discharge pipe 34, the second powder product discharge pipe 38, the third powder product discharge pipe 310 and the fourth powder product discharge pipe 54 share the powder product conveying device 60, and in turn, the conveying demand of the powder product can be realized with fewer powder product conveying devices 60. Since the number of the powder product conveying device 60 is small, the structure of the coal mine solid waste powder suspension calcining device 01 can be simplified and the manufacturing cost of the coal mine solid waste powder suspension calcining device 01 can be reduced.

[0073] The coal mine solid waste processing system disclosed in the embodiment of the present application can further comprise a powder product homogenizing device 70, which is in communication with the discharge port of the powder product conveying device 60, so as to homogenize the received powder product, which is conducive to improving the quality of the powder product; and the powder product packaging device 03 is connected with the powder outlet of the powder product homogenizing device 70, so as to package the homogenized powder product.

[0074] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative but not restrictive, and those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, which all belong to the protection of the present application.

Claims

1. A coal mine solid waste treatment system, characterised in that, The device comprises a pulverizing device (02), a coal mine solid waste powder suspension calcination device (01), and a powder product packaging device (03); The pulverizing device (02) comprises a crushing device (201), a first homogenizing device (202), a pulverizing device (203), and a second homogenizing device (204) connected in sequence; the crushing device (201) is used for crushing large pieces of coal mine solid waste to obtain small pieces of the coal mine solid waste; the first homogenizing device (202) is used for primary homogenization of the small pieces of the coal mine solid waste; the pulverizing device (203) is used for pulverizing the small pieces of the coal mine solid waste after primary homogenization to obtain coal mine solid waste powder; and the second homogenizing device (204) is used for secondary homogenization of the coal mine solid waste powder; The coal mine solid waste powder suspension calcination device (01) comprises a smoldering calcination furnace (10), a separation preheating device (20), and a cooling device (30); The powder inlet of the separation preheating device (20) is connected with the second homogenizing device (204) to receive and preheat the coal mine solid waste powder without preheating; the powder inlet (011) of the smoldering calcination furnace (10) is in communication with the first powder outlet of the separation preheating device (20) to smolder and calcine the coal mine solid waste powder preheated and discharged from the first powder outlet; The air outlet (012) of the smoldering calcination furnace (10) is in communication with the air inlet of the separation preheating device (20) to transport high-temperature flue gas containing the coal mine solid waste powder after smoldering calcination to the separation preheating device (20) for heat exchange and gas-solid separation; the separation preheating device (20) has a second powder outlet in communication with the powder inlet (031) of the cooling device (30) to transport the coal mine solid waste powder after gas-solid separation to the cooling device (30) for cooling; The powder product packaging device (03) is connected with at least the powder outlet of the cooling device (30) to receive powder products and perform overpackaging.

2. The coal mine solid waste treatment system of claim 1, wherein, The crushing device (201) comprises a plate feeder (2011), a wave roller feeder (2012), and a hammer crusher (2013) connected in sequence; the hammer crusher (2013) is in communication with the first homogenizing device (202) to transport the small pieces of the coal mine solid waste prepared to the first homogenizing device (202); the pulverizing device (203) is a vertical mill device; the pulverizing device (02) further comprises a metering feeding device (205) connected with the powder outlet of the second homogenizing device (204) and the powder inlet of the separation preheating device (20) to feed the separation preheating device (20) according to a preset feeding amount.

3. The coal mine solid waste treatment system of claim 1, wherein, 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 calcination furnace (10); an air inlet (211) of the fifth cyclone separator (21) is communicated with an air outlet (012) of the smoldering calcination furnace (10) through a first connecting pipe (261), so that the high-temperature flue gas discharged from the smoldering calcination furnace (10) enters the fifth cyclone separator (21); a powder outlet (221) of the fourth cyclone separator (22) is communicated with a powder inlet (011) of the smoldering calcination furnace (10) through a second connecting pipe (262), so that the coal mine solid waste powder flowing through the fourth cyclone separator (22) is conveyed into the smoldering calcination furnace (10), and the powder outlet (221) of the fourth cyclone separator (22) is the first powder outlet; A powder outlet (231) of the third cyclone separator (23) is communicated with a powder inlet (222) of the fourth cyclone separator (22) through a third connecting pipe (263), so that the coal mine solid waste powder flowing through the third cyclone separator (23) is conveyed into the fourth cyclone separator (22); an air outlet (212) of the fifth cyclone separator (21) is communicated with the third connecting pipe (263) through a fourth connecting pipe (264), so that the coal mine solid waste powder is driven into the fourth cyclone separator (22) by the high-temperature flue gas and the coal mine solid waste powder is preheated by the high-temperature flue gas; a powder outlet (241) of the second cyclone separator (24) is communicated with a powder inlet (232) of the third cyclone separator (23) through a fifth connecting pipe (265), so that the coal mine solid waste powder flowing through the second cyclone separator (24) is conveyed 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.

4. The coal mine solid waste treatment system of claim 3, wherein, The coal mine solid waste powder suspension calcination equipment (01) further comprises an iron removal device (40); the 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 iron removal on the reduced iron in the calcined coal mine solid waste powder.

5. The coal mine solid waste treatment system of claim 1, wherein, The cooling device (30) comprises a sixth cyclone separator (31), a first cooling main body (32) and a first air blower (33); The air outlet (311) of the sixth cyclone separator (31) is communicated with the air inlet (013) of the smoldering calcination furnace (10); the powder outlet (312) of the sixth cyclone separator (31) is communicated with the powder inlet (321) of the first cooling main body (32); the air outlet (322) of the first cooling main body (32) is communicated with the 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 the powder outlet of the first cooling main body (32) is connected with a first powder finished product discharge pipe (34).

6. The coal mine solid waste treatment system of claim 5, wherein, 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 an air outlet (322) of the first cooling main body (32), an air outlet (352) of the seventh cyclone separator (35) is communicated with an 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).

7. The coal mine solid waste treatment system of claim 6, wherein, 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).

8. The coal mine solid waste treatment system of claim 7, wherein, The coal mine solid waste powder suspension calcination equipment (01) further comprises a dust collector (50), an air inlet (51) of the dust collector (50) is communicated with an air outlet (393) of the eighth cyclone separator (39), an air outlet (52) of the dust collector (50) is communicated with an atmospheric environment, and a powder outlet (53) of the dust collector (50) is connected with a fourth powder finished product discharge pipe (54).

9. The coal mine solid waste treatment system of claim 8, wherein, The coal mine solid waste powder suspension calcination equipment (01) 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 a conveying direction of the powder finished product conveying device (60).

10. The coal mine solid waste treatment system of claim 9, wherein, The coal mine solid waste treatment system further comprises a powder finished product homogenizing device (70), the powder finished product homogenizing device (70) is communicated with a discharge port of the powder finished product conveying device (60) to homogenize the received powder finished product; and the powder finished product packaging device (03) is connected with a powder outlet of the powder finished product homogenizing device (70) to package the homogenized powder finished product. The coal mine solid waste powder suspension calcination equipment (01) further comprises a dust collector (50), an air inlet (51) of the dust collector (50) is communicated with an air outlet (393) of the eighth cyclone separator (39), an air outlet (52) of the dust collector (50) is communicated with an atmospheric environment, and a powder outlet (53) of the dust collector (50) is connected with a fourth powder finished product discharge pipe (54). The coal mine solid waste powder suspension calcination equipment (01) 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 a conveying direction of the powder finished product conveying device (60). The coal mine solid waste treatment system further comprises a powder finished product homogenizing device (70), the powder finished product homogenizing device (70) is communicated with a discharge port of the powder finished product conveying device (60) to homogenize the received powder finished product; and the powder finished product packaging device (03) is connected with a powder outlet of the powder finished product homogenizing device (70) to package the homogenized powder finished product.

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