Three-ring kiln for preparing flint clay by calcining coal gangue and calcining method thereof

Abstract

The invention relates to the technical field of recycling and high-valued utilization of industrial wastes (solid wastes and hazardous wastes), in particular to a three-ring kiln for preparing flint clay by calcining coal gangue and a calcining method of the three-ring kiln. The three-ring kiln comprises a sleeve kiln, a waste gas pipe and a waste heat boiler, and the waste gas pipe is fixedly connected to the upper portion of the outer wall of the sleeve kiln in a penetrating mode; a waste heat boiler is fixedly connected to the lower portion of the outer wall of the sleeve kiln, and a fracture is formed in the lower portion of the outer wall of the waste gas pipe. The temperature in the waste heat boiler can be increased through waste heat discharged by the waste heat guide-in pipe and the waste gas pipe, water in the water tank can be evaporated through the temperature rise in the waste heat boiler, and therefore evaporated water vapor floats on the flow guide plate, then enters the collecting tank through the flow guide plate, passes through the waste heat boiler and other equipment, and is recycled. Waste heat generated in the production process is converted into water vapor, secondary utilization of heat energy is achieved, and the water vapor can be used for power generation, heat supply, process heating and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of resource utilization of industrial waste (solid waste, hazardous waste), and specifically relates to a three-ring kiln for preparing coke stones by calcining coal gangue and a calcining method thereof. Background Art

[0002] Coal gangue is used as raw material to produce coke gemstones. Coal gangue is burned in a specific kiln (intelligent three-ring kiln) under an oxidizing atmosphere. After a specific temperature (1350±10℃), a specific pressure (0.12~0.18Mpa), and sufficient insulation time (75~135 hours), the mineral phase begins to change from the internal crystal structure of kaolinite to a stable mineral phase. The coal gangue raw material is preheated and dried, and calcined in an intelligent three-ring kiln to produce the "three dehydration" effects of dehydroxylation and decarbonization. The coke gemstone raw material is made by high-temperature calcination, crystallization, cooling and recrystallization.

[0003] However, the traditional three-ring kiln still has the following problems to be solved when in use:

[0004] The calcination of coal gangue will generate a large amount of waste heat, but most of the existing kiln technologies do not utilize or only utilize a small amount of waste heat, resulting in a waste of energy.

[0005] Therefore, we need a three-ring kiln and a calcination method for preparing coke stones by calcining coal gangue to completely solve the problem of insufficient utilization of waste heat in the prior art. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a three-ring kiln for preparing coke stones by calcining coal gangue and a calcination method thereof, which has the advantage of being able to fully utilize waste heat.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solution: comprising a sleeve kiln, an exhaust gas pipe and a waste heat boiler, wherein the exhaust gas pipe is fixedly connected to the upper part of the outer wall of the sleeve kiln, the waste heat boiler is fixedly connected to the lower part of the outer wall of the sleeve kiln, a fracture is opened at the lower part of the outer wall of the exhaust gas pipe, a connecting pipe is fixedly connected to the inside of the fracture, and the outer wall of the bottom of the exhaust gas pipe is fixedly connected to the top of the waste heat boiler.

[0008] Preferably, an air guide bin is fixedly connected to the upper part of the interior of the sleeve kiln, a heating bin is fixedly connected to the middle position of the interior of the sleeve kiln, a connecting column is fixedly connected to the outer wall of the bottom of the heating bin, and a lower material bin is fixedly connected to the outer wall of the bottom of a plurality of the connecting columns, and a cooling track is formed between the top of the lower material bin and the bottom of the heating bin.

[0009] Preferably, calcining equipment is fixedly connected to both sides of the outer wall of the sleeve kiln, a lower burner is fixedly connected to the output end of the calcining equipment, the outer wall of the lower burner is connected through the side wall of the sleeve kiln, an upper burner is fixedly connected above the calcining equipment, the outer wall of the upper burner passes through the interior of the sleeve kiln and is fixedly connected to the interior of the heating bin.

[0010] Preferably, the waste heat boiler is fixedly connected to a water trough, the inner wall of one side of the waste heat boiler is fixedly connected to a collecting trough, a guide plate is fixedly connected to the upper part of the waste heat boiler, a water inlet pipe is passed through and fixedly connected to the top of the waste heat boiler, a sealing plug is movably inserted inside the top of the water inlet pipe, an outlet hole is provided on the outer wall of the bottom of the water inlet pipe, a waste heat introduction pipe is passed through and fixedly connected to the interior of one side of the waste heat boiler above the water trough, and the outer wall of the waste heat introduction pipe is passed through and fixedly connected to the interior of the sleeve kiln.

[0011] Preferably, a heat exchanger is fixedly connected to the interior of the waste heat boiler above the waste heat inlet pipe, a heat medium outlet is fixedly connected to the outer wall of one end of the heat exchanger, and a refrigerant outlet is fixedly connected to the outer wall of the other end of the heat exchanger, and the outer wall of the refrigerant outlet is in contact with the interior of the cooling track.

[0012] Preferably, the interior of the connecting tube is fixedly connected to a condenser, the outer wall of the connecting tube is provided with a cavity, both sides of the interior of the cavity are provided with grooves, the interior of the cavity is movably connected with a mounting plate, the inner wall of the mounting plate is fixedly connected with activated carbon, the outer wall of the mounting plate is movably connected to a connecting plate, the outer walls of the upper and lower sides of the connecting plate are fixedly connected with sealing gaskets, the outer walls on opposite sides of the two sealing gaskets are movably contacted with the inner wall of the cavity, the outer walls at both ends of the connecting plate are fixedly connected with fixing buckles, the outer walls of the two fixing buckles are clamped with the interior of the groove, and the top of the connecting plate is provided with an arc-shaped hole connecting the outer walls on both sides.

[0013] Preferably, the outer wall of the mounting plate is fixedly connected to an L-shaped plate, a slot is opened inside the connecting plate, the top of the slot is fixedly connected to an elastic block, the outer walls of the bottom of a plurality of the elastic blocks are fixedly connected to a pressure plate, the outer wall of the L-shaped plate is movably engaged with the inside of the slot, and the outer wall of the top of the L-shaped plate is movably in contact with the outer wall of the bottom of the pressure plate.

[0014] A method for preparing pyroxene by calcining coal gangue, comprising the following six steps:

[0015] Step 1: Crushing process, the large pieces of coal gangue are crushed into medium pieces less than 150mm, and then lifted to the raw material bin by a large-angle belt, and preheated by the exhaust gas of the three-ring kiln before use;

[0016] Step 2: Screening process: the medium-sized gangue blocks preheated in the early stage are crushed, screened, and sorted by dry separators. Three types of gangue with a particle size of 3-5 mm enter the next process - the mixing stage;

[0017] Step 3: Loading process, the mixed gangue particles are accurately weighed and sent to the loading trolley from the mixing storage bin, and then sent to the kiln top preheater along the lifting track, slowly descending in the preheater, passing through two air-locking unloading devices, and then descending into the main body of the kiln in turn;

[0018] Step 4: Calcination process, the lower burner plays the role of ignition and combustion. After a period of calcination, the gangue passes through the primary air and secondary oxygen-enriched air of the burner to further assist combustion and burn fully;

[0019] Step 5: Cooling process: the cooling air from the kiln bottom penetrates the calcined clinker layer, cools the material and serves as the tertiary combustion air in the calcination zone to fully cool the material;

[0020] Step 6: Unloading process, the clinker in the three-ring kiln is forced to cool for 4 to 6 hours by high-pressure (≥87Kpa) cooling air, and then drops to room temperature (<40℃ in winter and <60℃ in summer), and is transported to the temporary storage of clinker finished products by unloading trucks.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The waste heat discharged through the waste heat inlet pipe and the waste pipe can increase the temperature inside the waste heat boiler. The increased temperature inside the waste heat boiler can evaporate the water inside the water tank, so that the evaporated water vapor floats on the guide plate, and then passes through the guide plate to the inside of the collection tank. Through the waste heat boiler and other equipment, the waste heat generated in the production process is converted into water vapor, realizing the secondary utilization of thermal energy. The water vapor can be used for power generation, heating, process heating and other purposes, thereby improving the overall energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] Figure 2 It is a cross-sectional structural schematic diagram of the present invention.

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the waste heat boiler of the present invention.

[0026] Figure 4 It is a schematic diagram of the internal structure of the top of the waste heat boiler of the present invention.

[0027] Figure 5 It is a schematic diagram of the cross-sectional structure of the water inlet pipe above the present invention.

[0028] Figure 6 It is a schematic diagram of the condenser structure of the present invention.

[0029] Figure 7 It is a schematic diagram of the connecting pipe structure of the present invention.

[0030] Figure 8 It is a schematic diagram of the top structure of the mounting plate of the present invention.

[0031] Fig. 9 It is a schematic diagram of the bottom structure of the mounting plate of the present invention.

[0032] In the figure: 1. sleeve kiln; 11. calcining equipment; 12. heating chamber; 13. air guide chamber; 14. lower burner; 15. upper burner; 16. cooling track; 17. lower hopper; 2. exhaust pipe; 21. connecting pipe; 22. connecting plate; 23. sealing gasket; 24. fixing buckle; 25. activated carbon; 26. cavity; 27. groove; 28. mounting plate; 29. ​​L-shaped plate; 210. elastic block; 211. pressure plate; 212. slot; 213. condenser; 3. waste heat boiler; 31. waste heat introduction pipe; 32. heat exchanger; 33. refrigerant outlet; 34. heat medium outlet; 35. water tank; 36. water inlet pipe; 37. collecting tank; 38. guide plate; 39. sealing plug. DETAILED DESCRIPTION

[0033] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] For example, see Figures 1 to 9The present invention provides a technical solution: comprising a sleeve kiln 1, an exhaust gas pipe 2 and a waste heat boiler 3, wherein the exhaust gas pipe 2 is fixedly connected to the upper part of the outer wall of the sleeve kiln 1, the waste heat boiler 3 is fixedly connected to the lower part of the outer wall of the sleeve kiln 1, a fracture is opened at the lower part of the outer wall of the exhaust gas pipe 2, a connecting pipe 21 is fixedly connected to the inside of the fracture, the outer wall at the bottom of the exhaust gas pipe 2 is fixedly connected to the top of the waste heat boiler 3, an air guide bin 13 is fixedly connected to the upper part of the sleeve kiln 1, a heating bin 12 is fixedly connected to the middle position of the sleeve kiln 1, and the heating bin 12 The outer wall of the bottom is fixedly connected with a connecting column, and the outer wall of the bottom of the multiple connecting columns is fixedly connected with a lower material bin 17. The top of the lower material bin 17 and the bottom of the heating bin 12 form a cooling track 16. The two sides of the outer wall of the sleeve kiln 1 are fixedly connected with calcining equipment 11, and the input end of the calcining equipment 11 is fixedly connected with a lower burner 14. The outer wall of the lower burner 14 is connected through the side wall of the sleeve kiln 1. The upper burner 15 is fixedly connected above the calcining equipment 11, and the outer wall of the upper burner 15 penetrates the interior of the sleeve kiln 1 and is fixedly connected to the interior of the heating bin 12.

[0035] By setting the upper burner 15, heat can enter the countercurrent zone and then flow out through the lower burner 14, so that the heat can be circulated, so that the heat can be more fully utilized inside the sleeve kiln 1, reducing heat loss. Due to the improvement of thermal efficiency, the sleeve kiln 1 can reduce energy consumption and production costs during the production process. The heat circulation mechanism enables the sleeve kiln 1 to maintain a stable temperature distribution and combustion state, thereby improving production efficiency.

[0036] Embodiment 2, on the basis of embodiment 1, a water trough 35 is fixedly connected inside the waste heat boiler 3, a collecting trough 37 is fixedly connected to the inner wall on one side of the waste heat boiler 3, a guide plate 38 is fixedly connected to the upper part of the waste heat boiler 3, a water inlet pipe 36 is fixedly connected through the top of the waste heat boiler 3, a sealing plug 39 is movably inserted inside the top of the water inlet pipe 36, an outlet hole is provided on the outer wall at the bottom of the water inlet pipe 36, a waste heat introduction pipe 31 is fixedly connected through the interior of one side of the waste heat boiler 3 above the water trough 35, and the outer wall of the waste heat introduction pipe 31 is fixedly connected through the interior of the sleeve kiln 1.

[0037] The waste heat discharged through the waste heat inlet pipe 31 and the exhaust pipe 2 can increase the temperature inside the waste heat boiler 3. The increased temperature inside the waste heat boiler 3 can evaporate the water inside the water tank 35, so that the evaporated water vapor floats on the guide plate 38, and then passes through the guide plate 38 to the inside of the collecting tank 37. Through the waste heat boiler 3 and other equipment, the waste heat generated in the production process is converted into water vapor, realizing the secondary utilization of thermal energy. The water vapor can be used for power generation, heating, process heating and other purposes, thereby improving the overall energy utilization efficiency.

[0038] Embodiment 3, on the basis of embodiment 2, a heat exchanger 32 is fixedly connected to the interior of the waste heat boiler 3 above the waste heat inlet pipe 31, a heat medium outlet 34 is fixedly connected to the outer wall at one end of the heat exchanger 32, and a refrigerant outlet 33 is fixedly connected to the outer wall at the other end of the heat exchanger 32, and the outer wall of the refrigerant outlet 33 is in contact with the interior of the cooling track 16.

[0039] When the waste heat inside the waste heat boiler 3 enters the interior of the heat exchanger 32 through the heat medium outlet 34, the waste heat can be converted into cold air through the movement of the heat exchanger 32. The cold air is discharged to the cooling track 16 through the heat exchanger 32, thereby reducing the temperature at the cooling track 16. The waste heat is converted into cold air for utilization, which not only reduces the emission of waste heat to the environment, but also realizes the recycling of energy, conforms to the environmental protection concept of energy conservation and emission reduction, and helps to reduce the production cost and energy consumption of the enterprise. The use of waste heat refrigeration technology and its application in the cooling treatment of coal gangue discharge reflects the company's emphasis on environmental protection and energy conservation and emission reduction, and helps to enhance the company's social image and market competitiveness.

[0040] Embodiment 4, on the basis of embodiment 3, the interior of the connecting pipe 21 is fixedly connected with a condenser 213, the outer wall of the connecting pipe 21 is provided with a cavity 26, both sides of the interior of the cavity 26 are provided with grooves 27, the interior of the cavity 26 is movably plugged with a mounting plate 28, the inner wall of the mounting plate 28 is fixedly connected with activated carbon 25, the outer wall of the mounting plate 28 is movably connected with a connecting plate 22, the outer walls of the upper and lower sides of the connecting plate 22 are fixedly connected with sealing gaskets 23, the outer walls on the opposite sides of the two sealing gaskets 23 are in movably contact with the inner wall of the cavity 26, and the two ends of the connecting plate 22 are connected to the inner wall of the cavity 26. The outer wall is fixedly connected with a fixing buckle 24, and the outer walls of the two fixing buckles 24 are clamped with the inside of the groove 27. An arc-shaped hole is opened on the top of the connecting plate 22 to connect the outer walls on both sides. The outer wall of the mounting plate 28 is fixedly connected with an L-shaped plate 29. A card slot 212 is opened inside the connecting plate 22. An elastic block 210 is fixedly connected to the top of the card slot 212. The outer walls of the bottom of multiple elastic blocks 210 are fixedly connected with a pressing plate 211. The outer wall of the L-shaped plate 29 is movably clamped with the inside of the card slot 212, and the outer wall at the top of the L-shaped plate 29 is in movably contact with the outer wall at the bottom of the pressing plate 211.

[0041] After the filtered gas enters the interior of the condenser 213, the condenser 213 is used to adsorb, absorb, analyze, separate and other processes on it to recover valuable organic matter and the waste heat of the exhaust gas. The recovered waste heat then passes through the bottom of the exhaust pipe 2 and enters the interior of the waste heat boiler 3, thereby increasing the utilization of the exhaust gas and avoiding direct discharge of the exhaust gas into the atmosphere to pollute the atmosphere, correspondingly increasing the utilization effect of the exhaust gas and reducing the waste of resources.

[0042] Example 5: The component test report of the product made by this mechanism and its calcination method is as follows:

[0043] 1) Test report (I)

[0044] Report No.:TY-YL-2021-07-12-103 Original record:2021-07-12-103

[0045]

[0046]

[0047] 2) Test report (II)

[0048]

[0049] 3) Test report (III)

[0050] Report No.:LS-YL-2021-5-20-004 Original record: 2021-5-20-004

[0051]

[0052]

[0053]

[0054] 4) Test report (IV)

[0055]

[0056] Report No.:TY-LZ-2021-07-17-113 Original record:2021-07-18-113

[0057]

[0058]

[0059] The working principle and use process of the present invention are as follows: during operation, first, when it is necessary to calcine the coal gangue, the calcining equipment 11 on both sides of the sleeve kiln 1 can be started, and then through the movement of the calcining equipment 11, it can be sprayed through the lower burner 14, and then through the setting of the heating bin 12, the flame can be prevented from directly contacting the coal gangue. The high temperature formed by the flame enters the interior of the heating bin 12 through the bottom of the heating bin 12, thereby achieving the effect of high-temperature roasting of the stone.

[0060] By setting the upper burner 15, the heat can enter the countercurrent zone and then flow out through the lower burner 14, so that the heat can be circulated, so that the heat can be more fully utilized inside the sleeve kiln 1, reducing heat loss. Due to the improvement of thermal efficiency, the sleeve kiln 1 can reduce energy consumption and production costs during the production process. The heat circulation mechanism enables the sleeve kiln 1 to maintain a stable temperature distribution and combustion state, thereby improving production efficiency.

[0061] When the gangue is calcined to 90% lime, it is baked at low temperature to obtain maximum activity. After calcination, the gangue shell is cooled through the cooling track 16 and then discharged through the lower bin 17 in sequence.

[0062] The waste gas during the calcination process can enter the interior of the air guide chamber 13, and then enter the interior of the connecting pipe 21 through the waste gas pipe 2. When the waste gas enters the interior of the connecting pipe 21, it can be filtered through the activated carbon 25, so as to effectively adsorb the harmful substances in the waste gas. The waste gas filtered by the activated carbon 25 has a purer composition, which reduces the interference of impurities on the thermal energy conversion process, helps the thermal energy conversion equipment to operate more stably and efficiently, and improves the overall thermal energy conversion efficiency. Even if the filtered gas is discharged into the atmosphere, the pollution to the atmosphere is reduced accordingly, which helps to reduce pollution to the environment and improve air quality.

[0063] After the filtered gas enters the interior of the condenser 213, the condenser 213 is used to adsorb, absorb, analyze, separate and other processes to recover valuable organic matter and the waste heat of the exhaust gas. The recovered waste heat then passes through the bottom of the exhaust pipe 2 and enters the interior of the waste heat boiler 3, thereby increasing the utilization of the exhaust gas and avoiding direct discharge of the exhaust gas into the atmosphere to pollute the atmosphere, thereby correspondingly increasing the utilization effect of the exhaust gas and reducing the waste of resources.

[0064] By setting the waste heat introduction pipe 31, the waste heat inside the sleeve kiln 1 can be transferred to the inside of the waste heat boiler 3. The waste heat discharged through the waste heat introduction pipe 31 and the exhaust pipe 2 can increase the temperature inside the waste heat boiler 3. By increasing the temperature inside the waste heat boiler 3, the water in the water tank 35 can be evaporated, so that the evaporated water vapor floats on the guide plate 38, and then passes through the guide plate 38 to the inside of the collecting tank 37. Through the waste heat boiler 3 and other equipment, the waste heat generated in the production process is converted into water vapor, realizing the secondary utilization of thermal energy. The water vapor can be used for power generation, heating, process heating and other purposes, thereby improving the overall energy utilization efficiency.

[0065] It should be noted that: when the water in the water tank 35 has completely evaporated, the sealing plug 39 can be pulled out from the water inlet pipe 36 , and water can be added to the water tank 35 .

[0066] When the waste heat inside the waste heat boiler 3 enters the interior of the heat exchanger 32 through the heat medium outlet 34, the waste heat can be converted into cold air through the movement of the heat exchanger 32. The cold air is discharged to the cooling track 16 through the heat exchanger 32, thereby reducing the temperature at the cooling track 16. The waste heat is converted into cold air for utilization, which not only reduces the emission of waste heat to the environment, but also realizes the recycling of energy, conforms to the environmental protection concept of energy conservation and emission reduction, and helps to reduce the production cost and energy consumption of the enterprise. The use of waste heat refrigeration technology and its application in the cooling treatment of coal gangue discharge reflects the company's emphasis on environmental protection and energy conservation and emission reduction, and helps to enhance the company's social image and market competitiveness.

[0067] After long-term use, when the activated carbon 25 needs to be replaced, the arc hole on the connecting plate 22 can be pulled, and then the movement of the arc hole can make the connecting plate 22 drive the mounting plate 28 and the fixing buckle 24 to move at the same time. When the fixing buckle 24 is forced to move to the outside of the groove 27, the flexibility of the fixing buckle 24 itself can be used to make the protrusion on the fixing buckle 24 squeeze the fixing buckle 24 toward the middle, so that the height of the fixing buckle 24 can be made smaller than the height of the groove 27, thereby moving the fixing buckle 24 out of the inside of the groove 27. This operation makes it easy for the connecting plate 22 to drive the mounting plate 28 to separate the inside of the connecting pipe 21, thereby saving the operator's operating time.

[0068] After the connecting plate 22 drives the mounting plate 28 and the activated carbon 25 to be moved out from the inside of the connecting pipe 21, the operator can push the mounting plate 28 upward, and then through the upward movement of the mounting plate 28, the L-shaped plate 29 can push the pressing plate 211 to move upward, so that the L-shaped plate 29 moves to the top of the slot 212, and the mounting plate 28 can drive the L-shaped plate 29 to be pulled out from the inside of the slot 212, so as to replace the activated carbon 25, thereby improving the filtering effect of the activated carbon 25 on the exhaust gas, and then through the cooperation of the elastic block 210 and the pressing plate 211, the L-shaped plate 29 can be firmly fixed in the inside of the slot 212 when the activated carbon 25 is working, thereby preventing the mounting plate 28 from detaching from the inside of the slot 212, and correspondingly increasing the stability of the mounting plate 28.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-ring kiln for preparing coke stones by calcining coal gangue, comprising a sleeve kiln (1), an exhaust gas pipe (2) and a waste heat boiler (3), characterized in that: An exhaust gas pipe (2) is fixedly connected to the upper part of the outer wall of the sleeve kiln (1), and a waste heat boiler (3) is fixedly connected to the lower part of the outer wall of the sleeve kiln (1). A fracture is provided at the lower part of the outer wall of the exhaust gas pipe (2), and a connecting pipe (21) is fixedly connected to the inside of the fracture. The outer wall of the bottom of the exhaust gas pipe (2) is fixedly connected to the top of the waste heat boiler (3).

2. The three-ring kiln for preparing coke stones by calcining coal gangue according to claim 1, characterized in that: An air guide bin (13) is fixedly connected to the upper portion of the sleeve kiln (1), a heating bin (12) is fixedly connected to the middle portion of the sleeve kiln (1), a connecting column is fixedly connected to the outer wall of the bottom of the heating bin (12), a lower material bin (17) is fixedly connected to the outer wall of the bottom of a plurality of the connecting columns, and a top of the lower material bin (17) and the bottom of the heating bin (12) form a cooling track (16).

3. The three-ring kiln for preparing coke stones by calcining coal gangue according to claim 2, characterized in that: The outer walls of the sleeve kiln (1) are fixedly connected to calcining equipment (11) on both sides, the output end of the calcining equipment (11) is fixedly connected to a lower burner (14), the outer wall of the lower burner (14) is connected through the side wall of the sleeve kiln (1), and the upper burner (15) is fixedly connected above the calcining equipment (11), the outer wall of the upper burner (15) is connected through the interior of the sleeve kiln (1) and is fixedly connected to the interior of the heating chamber (12).

4. The three-ring kiln for preparing coke stones by calcining coal gangue according to claim 1, characterized in that: A water tank (35) is fixedly connected inside the waste heat boiler (3), a collecting tank (37) is fixedly connected to the inner wall of one side of the waste heat boiler (3), a guide plate (38) is fixedly connected to the upper part of the waste heat boiler (3), a water inlet pipe (36) is fixedly connected through the top of the waste heat boiler (3), a sealing plug (39) is movably inserted inside the top of the water inlet pipe (36), an outlet hole is opened on the outer wall of the bottom of the water inlet pipe (36), a waste heat introduction pipe (31) is fixedly connected through the inside of one side of the waste heat boiler (3) located above the water tank (35), and the outer wall of the waste heat introduction pipe (31) is fixedly connected to the inside of the sleeve kiln (1).

5. The three-ring kiln for preparing coke stones by calcining coal gangue according to claim 4, characterized in that: A heat exchanger (32) is fixedly connected to the interior of the waste heat boiler (3) above the waste heat inlet pipe (31), and one end of the heat exchanger (32) is fixedly connected to a heat medium outlet (34) on its outer wall, and the other end of the heat exchanger (32) is fixedly connected to a refrigerant outlet (33) on its outer wall, and the outer wall of the refrigerant outlet (33) is in contact with the interior of the cooling track (16).

6. The three-ring kiln for preparing coke stones by calcining coal gangue according to claim 1, characterized in that: The interior of the connecting pipe (21) is fixedly connected to a condenser (213); the outer wall of the connecting pipe (21) is provided with a cavity (26); grooves (27) are provided on both sides of the interior of the cavity (26); a mounting plate (28) is movably inserted into the interior of the cavity (26); the inner wall of the mounting plate (28) is fixedly connected to activated carbon (25); the outer wall of the mounting plate (28) is movably connected to a connecting plate (22); the outer walls of the upper and lower sides of the connecting plate (22) are fixedly connected to sealing gaskets (23); the outer walls of the two sealing gaskets (23) on the opposite sides are in movably contact with the inner wall of the cavity (26); the outer walls of the two ends of the connecting plate (22) are fixedly connected to fixing buckles (24); the outer walls of the two fixing buckles (24) are clamped with the interior of the groove (27); and the top of the connecting plate (22) is provided with an arc-shaped hole for connecting the outer walls on both sides.

7. The three-ring kiln for preparing coke stones by calcining coal gangue according to claim 6, characterized in that: The outer wall of the mounting plate (28) is fixedly connected to an L-shaped plate (29); a slot (212) is provided inside the connecting plate (22); an elastic block (210) is fixedly connected to the top of the slot (212); the outer walls of the bottoms of the plurality of elastic blocks (210) are fixedly connected to a pressing plate (211); the outer wall of the L-shaped plate (29) is movably engaged with the inside of the slot (212); and the outer wall at the top of the L-shaped plate (29) is in movably contact with the outer wall at the bottom of the pressing plate (211).

8. A method for preparing pyrocarbon stones by calcining coal gangue, which is realized by a three-ring kiln for preparing pyrocarbon stones by calcining coal gangue as claimed in any one of claims 1 to 7, and the method for preparing pyrocarbon stones by calcining coal gangue comprises the following steps: Step 1: Crushing process, the large pieces of coal gangue are crushed into medium pieces less than 150mm, and then lifted to the raw material bin by a large-angle belt, and preheated by the exhaust gas of the three-ring kiln before use; Step 2: Screening process: the medium-sized gangue blocks preheated in the early stage are crushed, screened, and sorted by dry separators. Three types of gangue with a particle size of 3-5 mm enter the next process - the mixing stage; Step 3: Loading process, the mixed gangue particles are accurately weighed and sent to the loading trolley from the mixing storage bin, and then sent to the kiln top preheater along the lifting track, slowly descending in the preheater, passing through two air-locking unloading devices, and then descending into the main body of the kiln in turn; Step 4: Calcination process, the lower burner plays the role of ignition and combustion. After a period of calcination, the gangue passes through the primary air and secondary oxygen-enriched air of the burner to further assist combustion and burn fully; Step 5: Cooling process: the cooling air from the kiln bottom penetrates the calcined clinker layer, cools the material and serves as the tertiary combustion air in the calcination zone to fully cool the material; Step 6: Unloading process, the clinker in the three-ring kiln is forced to cool for 4 to 6 hours by high-pressure (≥87Kpa) cooling air, and then drops to room temperature (<40℃ in winter and <60℃ in summer), and is transported to the temporary storage of clinker finished products by unloading trucks.

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