CN115725311A - Rotary kiln, solid waste treatment system and solid waste treatment method - Google Patents
Rotary kiln, solid waste treatment system and solid waste treatment method Download PDFInfo
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- CN115725311A CN115725311A CN202211512945.2A CN202211512945A CN115725311A CN 115725311 A CN115725311 A CN 115725311A CN 202211512945 A CN202211512945 A CN 202211512945A CN 115725311 A CN115725311 A CN 115725311A
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Abstract
The invention discloses a rotary kiln, a solid waste treatment system and a solid waste treatment method, and relates to the technical field of solid waste treatment. After useless through drying and preheating in first cylinder admittedly, being sent into the second cylinder, useless admittedly carries out pyrolysis at the second cylinder, and the pyrolysis liquid that produces among the pyrolysis process flows from the pyrolysis liquid export, and the pyrolysis charcoal export discharge is then followed to solid pyrolysis charcoal part to with pyrolysis liquid and pyrolysis charcoal separation, through discharging the pyrolysis liquid in advance, thereby avoided the pyrolysis liquid to get into behind the third cylinder, the condition of coking under the high temperature environment of third cylinder.
Description
Technical Field
The invention relates to the technical field of solid waste treatment equipment, in particular to a rotary kiln, a solid waste treatment system and a solid waste treatment method.
Background
The general solid waste comprises municipal solid waste, domestic solid waste, sludge and the like, contains a large amount of organisms and organic matters, and can be converted into pyrolysis gas, tar and other pyrolysis liquid and pyrolysis carbon by heating at the temperature of more than 200-500 ℃ in an anaerobic state. The specific process can be divided into the following stages:
(1) A drying and preheating section (200 ℃), and water is separated out;
(2) In the thermal decomposition stage (200-500 ℃), gas (generically called pyrolysis gas) such as the water of combination, carbon dioxide, carbon monoxide, methane and the like and liquid (generically called pyrolysis liquid) such as tar and the like are generated, and volatile matters are separated out along with the polymerization and synthesis reaction to start to form solid matters;
(3) And in the drying shrinkage and carbonization stages (500-950 ℃), volatile matters are separated out, a large amount of pyrolysis gas is generated, and carbonization is finished to form pyrolytic carbon.
When the traditional rotary kiln is used for solid waste carbonization, a large amount of tar and other pyrolysis liquid can be generated in the kiln, particularly in a thermal decomposition stage (200-500 ℃), a large amount of pyrolysis liquid is adhered to the inner wall of the rotary kiln, the heat transfer efficiency of the rotary kiln at the stage is seriously reduced, and local high temperature is easily caused. Meanwhile, a large amount of pyrolysis liquid mixed solid matters are easy to adhere to the inner wall of the rotary kiln to cause coking and slagging.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a rotary kiln which can treat solid waste and prevent the problem that pyrolysis liquid is adhered to the inner wall of the rotary kiln in the solid waste treatment process to reduce the heat transfer efficiency of the rotary kiln.
The invention also provides a solid waste treatment system.
The invention also provides a solid waste treatment method.
A rotary kiln according to an embodiment of a first aspect of the invention comprises:
the first roller is provided with a first feeding hole and a first discharging hole;
the first material conveying mechanism is arranged in the first roller and used for discharging solid wastes entering from the first feeding hole from the first discharging hole;
the second roller is sleeved on the first roller, the first discharge port is positioned in the second roller, the second roller is provided with a pyrolysis liquid outlet and a solid waste outlet, and pyrolysis liquid in the second roller can flow out of the pyrolysis liquid outlet;
the second material conveying mechanism is arranged in the second roller and used for discharging the solid waste entering the second roller from the solid waste outlet;
the third roller is sleeved on the second roller, the solid waste outlet is positioned in the third roller, and the third roller is provided with a second discharge hole;
the third material conveying mechanism is arranged in the third roller and used for discharging solid wastes entering the third roller from the second discharge hole;
a heating system for regulating the temperature within the first, second and third drums.
The rotary kiln provided by the embodiment of the invention has at least the following beneficial effects: after the solid waste is dried and preheated in the first roller, the solid waste is sent into the second roller, the solid waste is subjected to thermal decomposition in the second roller, the pyrolysis liquid generated in the thermal decomposition process flows out from the pyrolysis liquid outlet, and the solid waste part is discharged from the solid waste outlet, so that the pyrolysis liquid and the solid waste are separated, the pyrolysis liquid is discharged in advance, and the situation of coking under the high-temperature environment of the third roller after the pyrolysis liquid enters the third roller is avoided.
According to some embodiments of the invention, the second cylinder is a high temperature resistant porous ceramic cylinder.
According to some embodiments of the present invention, the second drum has a double-layer drum wall structure, and includes an inner drum wall and an outer drum wall, the inner drum wall is provided with a pore, a pyrolysis oil outlet channel is formed between the inner drum wall and the outer drum wall, the pore is communicated with the pyrolysis oil outlet channel, and the pyrolysis liquid outlet is communicated with the pyrolysis oil outlet channel.
According to some embodiments of the invention, the second drum is horizontally arranged, and the drum diameter of the second drum gradually increases from the solid waste outlet to the pyrolysis liquid outlet.
According to some embodiments of the invention, the pyrolysis liquid recovery device is provided with a recovery cavity, the recovery cavity is hermetically sleeved on the second roller, so that a closed cavity is formed between the recovery cavity and the second roller, and the pyrolysis liquid outlet is located in the closed cavity.
According to some embodiments of the invention, the pyrolysis liquid recovery device is provided with an air tap for connecting with a fan.
According to some embodiments of the invention, the first drum is horizontally disposed, the first material transfer mechanism comprises a first helical blade disposed on an inner wall of the first drum;
the second roller is horizontally arranged, the second material conveying mechanism comprises a second spiral blade, the second spiral blade is arranged on the inner wall of the second roller, and the spiral direction of the second spiral blade is opposite to that of the first spiral blade;
the third roller is horizontally arranged, the third material conveying mechanism comprises a third helical blade, the third helical blade is arranged on the inner wall of the third roller, and the helical direction of the third helical blade is the same as that of the first helical blade;
the first roller, the second roller and the third roller are driven by the driving device to coaxially rotate in the same direction.
A solid waste treatment system according to a second aspect of the embodiment of the invention comprises the rotary kiln of the above embodiment.
The solid waste treatment system provided by the embodiment of the invention at least has the following beneficial effects: by adopting the solid waste treatment system of the rotary kiln, the energy consumption of the solid waste treatment system can be reduced.
According to a third aspect of the invention, the solid waste treatment method comprises the rotary kiln of the embodiment, and the solid waste treatment is carried out through the following steps:
s100: drying and preheating, namely throwing the solid waste into the first roller from the first feeding hole, discharging the solid waste entering the first roller from the first discharging hole under the action of the first material conveying mechanism, and simultaneously regulating and controlling the temperature in the first roller by the heating system to dry and preheat the solid waste of the first roller;
s200: performing thermal decomposition, wherein the second material conveying mechanism discharges the solid waste entering the second roller from the solid waste outlet, meanwhile, the heating system regulates and controls the temperature in the second roller to a thermal decomposition temperature, generally 200-500 ℃, performs thermal decomposition on the solid waste in the second roller, and the pyrolysis liquid obtained by thermal decomposition flows out from the pyrolysis liquid outlet;
s300: and drying, shrinking and carbonizing, wherein the third material conveying mechanism discharges the solid waste entering the third roller through the second discharge hole, and meanwhile, the heating system regulates and controls the temperature in the third roller to the shrinking and carbonizing temperature, generally 500-950 ℃, and the solid waste in the third roller is subjected to drying, shrinking and carbonizing.
The solid waste treatment method provided by the embodiment of the invention at least has the following beneficial effects: in the solid waste treatment process, pyrolysis liquid and solid waste are separated in the thermal decomposition stage, and the pyrolysis liquid is discharged in advance, so that the problems that the heat transfer efficiency of the rotary kiln is reduced, the heating is uneven and the like due to the fact that the pyrolysis liquid is coked in the high-temperature environment of the third roller after entering the third roller are solved.
According to some embodiments of the invention, in step S200, the pyrolysis liquid is collected, and a fan is connected to an air nozzle on the pyrolysis liquid recovery device, and the fan forms a negative pressure environment in the sealed chamber to suck out the pyrolysis liquid in the pores.
According to some embodiments of the present invention, step S200 further includes opening pores, and the blower forms a positive pressure environment in the sealed chamber to reversely blow out the pyrolysis liquid retained in the pores.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the following figures and examples, in which:
fig. 1 is a schematic structural view of a rotary kiln according to an embodiment of the present invention.
Reference numerals:
a first drum 100; a first feed port 110; a first discharge port 120;
a first material transport mechanism 210; a second material transfer mechanism 220; a third material transfer mechanism 230;
a second drum 300; a pyrolysis liquid outlet 310; a solid waste outlet 320;
a pyrolysis liquid recovery unit 400; a closed chamber 410;
a third drum 500; a second discharge port 510;
a heating system 600; a first heating device 610; a second heating device 620;
a kiln tail cover 700; a pyrolysis gas outlet 710; a pyrolytic carbon outlet 720.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to, for example, the upper, lower, etc., is indicated based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, a plurality means two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, the present invention discloses a rotary kiln, comprising:
a first drum 100 provided with a first feed port 110 and a first discharge port 120;
the first material conveying mechanism 210 is arranged in the first roller 100 and used for discharging solid wastes entering from the first feeding hole 110 from the first discharging hole 120;
the second roller 300 is sleeved on the first roller 100, the first discharge hole 120 is positioned in the second roller 300, the second roller 300 is provided with a pyrolysis liquid outlet 310 and a solid waste outlet 320, and pyrolysis liquid of the second roller 300 can flow out from the pyrolysis liquid outlet 310;
the second material conveying mechanism 220 is arranged in the second roller 300 and used for discharging the solid waste entering the second roller 300 from the solid waste outlet 320;
the third roller 500, the third roller 500 is sleeved on the second roller 300, the solid waste outlet 320 is positioned in the third roller 500, and the third roller 500 is provided with a second discharge hole 510;
the third material conveying mechanism 230 is arranged in the third roller 500 and used for discharging solid wastes entering the third roller 500 from the second discharge port 510;
a heating system 600 for regulating the temperature inside the first drum 100, the second drum 300 and the third drum 500.
In this embodiment, the solid waste is put into the first drum 100 through the first feeding hole 110, the solid waste entering the first drum 100 is discharged through the first discharging hole 120 under the action of the first material conveying mechanism 210, and meanwhile, the heating system 600 regulates and controls the temperature in the first drum 100 to dry and preheat the solid waste of the first drum 100. Wherein the preheating temperature is about 200 ℃, and moisture in the solid waste is removed after the preset drying, so that the solid waste entering the second drum 300 is preheated and dehydrated.
After the solid waste is dried and preheated in the first roller 100, the solid waste is sent into the second roller 300, the solid waste is subjected to thermal decomposition in the second roller 300, the pyrolysis liquid generated in the thermal decomposition process flows out from the pyrolysis liquid outlet 310, and the solid waste part is discharged from the solid waste outlet 320, so that the pyrolysis liquid and the solid waste are separated, the pyrolysis liquid is discharged in advance, and the situation of coking under the high-temperature environment of the third roller 500 after the pyrolysis liquid enters the third roller 500 along with the solid waste is avoided.
The solid waste after the pyrolysis liquid is separated out is discharged from the solid waste outlet 320 through the second material conveying mechanism 220, and enters the third drum 500. The third material conveying mechanism 230 discharges the solid waste entering the third roller 500 through the second discharge port 510, and in the process of conveying the solid waste in the third roller 500, the heating system 600 regulates and controls the temperature in the third roller 500 to 500-950 ℃ to perform drying shrinkage and carbonization on the solid waste in the third roller 500. The solid waste discharged from the second discharge port 510 completes the drying shrinkage and carbonization of the solid waste.
In this embodiment, the heating system 600 includes a first heating device 610 and a second heating device 620, and the temperature in the kiln is adjusted by cooperation of the first heating device 610 and the second heating device 620, and at the same time, the temperature of the materials in the first drum 100, the second drum 300 and the third drum 500 is controlled by cooperation of the feeding speeds in the first drum 100, the second drum 300 and the third drum 500.
Specifically, when the temperature of the materials in the drum is lower than the temperature of the required reaction, the feeding speed in the corresponding drum is reduced, so that the heating time of the materials in the corresponding drum is prolonged, and the temperature of the materials in the corresponding drum can be increased. When the temperature of the materials in the drum is higher than the temperature of the required reaction, the feeding speed in the corresponding drum is accelerated, so that the heating time of the materials in the corresponding drum is shortened, and the temperature of the materials in the corresponding drum can be reduced.
Referring to fig. 1, the second drum 300 is horizontally disposed, the second drum 300 is a high temperature resistant porous ceramic drum, pores are formed on the drum wall of the second drum 300, and the pyrolysis liquid outlet 310 is communicated with the interior of the second drum 300 through the pores.
In this embodiment, the second drum 300 is a drum 300 made of high temperature resistant porous ceramic, the wall of the second drum 300 is provided with pores, the second drum 300 made of high temperature resistant porous ceramic can keep its own characteristics unchanged under the high temperature condition of thermal decomposition, the second drum 300 has pores, and the pyrolysis liquid generated in the thermal decomposition process flows out of the second drum 300 through the pores and is recovered by the pyrolysis liquid recovery device 400. While the solid waste in the second drum 300 is retained in the second drum 300. Thereby realizing the separation of the pyrolysis liquid and the solid waste. Typically, the outlet of the aperture is the pyrolyzation liquid outlet 310.
In some embodiments, the second drum 300 has a double-layer drum wall structure, and includes an inner drum wall and an outer drum wall, the inner drum wall is provided with a hole, a pyrolysis oil outlet channel is formed between the inner drum wall and the outer drum wall, the hole is communicated with the pyrolysis oil outlet channel, and the pyrolysis liquid outlet is communicated with the pyrolysis oil outlet channel.
The pyrolysis liquid generated in the thermal decomposition process flows into the pyrolysis oil lead-out passage from the second drum 300 through the pores, and then flows out from the pyrolysis liquid outlet to be recovered by the pyrolysis liquid recovery device 400. While the solid waste in the second drum 300 is retained in the second drum 300. Thereby realizing the separation of the pyrolysis liquid and the solid waste.
Referring to fig. 1, the drum diameter of the second drum 300 is gradually increased from the solid waste outlet 320 to the pyrolysis liquid outlet 310.
In the present embodiment, the diameter of the second drum 300 is gradually increased from the solid waste outlet 320 to the pyrolysis liquid outlet 310. As shown in fig. 1, the solid waste outlet 320 of the second drum 300 is on the left side, the pyrolysis liquid outlet 310 is on the right side, and the inner wall of the second drum 300 is in an inclined state with a height from the left to the right. The pyrolysis liquid in the second drum 300 and the pyrolysis liquid in the pores of the second drum 300 can flow to the right side under the action of gravity, i.e. flow to the pyrolysis liquid outlet 310, which is beneficial for the pyrolysis liquid to flow out.
When it is required to be noted that, the pores on the wall of the second drum 300 are preferably arranged at the portion outside the third drum 500, and the pyrolysis liquid in the second drum 300 flows into the third drum 500 through the pores. Because the inner wall of second cylinder 300 is the tilt state, therefore even the whole of second cylinder 300 all is equipped with the hole and can, the pyrolysis liquid in the second cylinder 300 to and the pyrolysis liquid in the second cylinder 300 hole can flow to the right side under the effect of gravity, only a small part of pyrolysis liquid can get into third cylinder 500, can not produce too big influence to equipment is whole.
Referring to fig. 1, the pyrolysis liquid recycling device 400 is further included, the pyrolysis liquid recycling device 400 is provided with a recycling cavity, the recycling cavity is hermetically sleeved on the second roller 300, so that a closed chamber 410 is formed between the recycling cavity and the second roller 300, and the pyrolysis liquid outlet 310 is located in the closed chamber 410.
In the present embodiment, the pyrolysis liquid discharged from the pyrolysis liquid outlet 310 of the second drum 300 is collected by providing the pyrolysis liquid recovery apparatus 400. Specifically, the recycling chamber is hermetically sealed and mounted on the second drum 300, and a closed chamber 410 is formed between the recycling chamber and the second drum 300, so that it is ensured that no outside air enters the second drum 300 during the pyrolysis reaction. The pyrolysis liquid flowing out from the pyrolysis liquid outlet 310 enters the closed chamber 410. In addition, the pyrolysis liquid can be discharged after collecting a certain amount of pyrolysis liquid in the cavity to be recovered by arranging the oil discharge port on the pyrolysis liquid recovery device 400.
Since the pyrolysis liquid in the second drum 300 is discharged through the pores of the second drum 300 in this embodiment, the pore ratio of the pores is small to prevent solid waste from being discharged from the pores, and thus the fluidity of the pyrolysis liquid in the pores is low and the discharging speed is slow. It is easy to cause a situation that part of the pyrolysis liquid is retained in the pores to cause pore clogging.
Based on this, the pyrolysis liquid recovery device 400 is provided with an air nozzle for connecting with a fan. In the thermal decomposition process, the air nozzle is connected with the fan, so that the closed chamber 410 forms a negative pressure environment, and the pyrolysis liquid can be added under the action of the negative pressure and is discharged from the pores. In order to prevent the pores from being blocked, the closed chamber 410 is formed into a positive pressure environment by the blower, and the pyrolysis liquid in the pores can be blown back to the second drum 300 in a reverse direction under the action of the positive pressure. The blocking of the pores by the pyrolysis liquid retained in the pores can be avoided.
In some embodiments, referring to fig. 1, the first drum 100 is horizontally disposed, and the first material transfer mechanism 210 includes a first helical blade disposed on an inner wall of the first drum 100;
the second drum 300 is arranged horizontally, and the second material conveying mechanism 220 comprises a second helical blade which is arranged on the inner wall of the second drum 300, and the helical direction of the second helical blade is opposite to that of the first helical blade;
the third roller 500 is horizontally arranged, and the third material conveying mechanism 230 comprises a third helical blade which is arranged on the inner wall of the third roller 500 and has the same helical direction as the first helical blade;
the device further comprises a driving device, wherein the driving device drives the first roller 100, the second roller 300 and the third roller 500 to coaxially rotate in the same direction.
In this embodiment, the first drum 100, the second drum 300 and the third drum 500 are relatively fixedly installed together, and since the spiral direction of the second helical blade is opposite to that of the first helical blade and the third helical blade, the advancing direction of the material in the second drum 300 is opposite to that of the first drum 100 and the third drum 500. The whole structure of the rotary kiln is greatly simplified.
In some embodiments, referring to fig. 1, the first drum 100 is horizontally disposed, and the first material transfer mechanism 210 includes a first helical blade disposed on an inner wall of the first drum 100 and a first driving unit that drives the first drum 100 to rotate about its axis.
In this embodiment, the first drum 100 rotates around the axial direction under the action of the first driving unit, and during the rotation of the first drum 100, the first spiral blade in the first drum 100 pushes the solid waste in the drum to move forward, so that the solid waste entering the first drum 100 is discharged from the first discharge port. By controlling the rotational speed of the first drum 100, the feed rate can be controlled, thereby controlling the temperature of the material in the first drum 100.
In other embodiments, the material in the first roller 100 can be pushed forward by arranging a screw feeding shaft on the first roller 100 and driving the screw feeding shaft to rotate.
The second roller 300 is horizontally arranged, the second material conveying mechanism 220 comprises a second helical blade and a second driving unit, the second helical blade is arranged on the inner wall of the second roller 300, and the second driving unit drives the second roller 300 to rotate around the axis of the second roller;
in this embodiment, the second drum 300 rotates around the axial direction under the action of the second driving unit, and during the rotation of the second drum 300, the second spiral blade in the second drum 300 pushes the solid waste in the drum to move forward, so that the solid waste entering the second drum 300 is discharged from the second discharge port 510. By controlling the rotational speed of the second drum 300, the feeding speed can be controlled, thereby controlling the temperature of the material in the second drum 300.
The third roller 500 is horizontally disposed, and the third material transfer mechanism 230 includes a third helical blade disposed on an inner wall of the third roller 500 and a third driving unit that drives the third roller 500 to rotate about its axis.
In this embodiment, the third drum 500 rotates around the axial direction under the action of the third driving unit, and during the rotation of the third drum 500, the third spiral blade in the third drum 500 pushes the solid waste in the drum to move forward, so that the solid waste entering the third drum 500 is discharged from the solid waste outlet 320. By controlling the rotational speed of the third drum 500, the feeding speed can be controlled, thereby controlling the temperature of the material in the third drum 500.
The kiln tail hood 700 is arranged at the outlet end of the third roller 500, the solid discharged by the third roller 500 is discharged from a pyrolysis carbon outlet 720 at the lower part, and the pyrolysis gas is discharged from a pyrolysis gas outlet 710 at the upper part.
The invention also discloses a solid waste treatment system which comprises the rotary kiln of the embodiment.
Since the solid waste treatment system adopts all technical solutions of the rotary kiln of the above embodiment, at least all beneficial effects brought by the technical solutions of the above embodiment are achieved, and no further description is provided herein.
The invention also discloses a solid waste treatment method, the rotary kiln of the embodiment is used for carrying out solid waste treatment through the following steps:
s100: drying and preheating, namely putting the solid waste into the first roller 100 through the first feeding hole 110, discharging the solid waste entering the first roller 100 through the first discharging hole 120 under the action of the first material conveying mechanism 210, and meanwhile, regulating and controlling the temperature in the first roller 100 by the heating system 600 to dry and preheat the solid waste of the first roller 100;
s200: performing thermal decomposition, namely discharging the solid waste entering the second roller 300 from the solid waste outlet 320 by the second material conveying mechanism 220, regulating the temperature in the second roller 300 to 200-500 ℃ by the heating system 600, performing thermal decomposition on the solid waste in the second roller 300, and allowing pyrolysis liquid obtained by thermal decomposition to flow out from the pyrolysis liquid outlet 310;
s300: and (3) drying, shrinking and carbonizing, wherein the third material conveying mechanism discharges the solid waste entering the third roller 500 from the second discharge hole 510, and meanwhile, the heating system 600 regulates and controls the temperature in the third roller 500 to 500-950 ℃ to perform drying, shrinking and carbonizing on the solid waste in the third roller 500.
In the solid waste treatment process, the pyrolysis liquid and the solid waste are separated in the thermal decomposition stage, and the pyrolysis liquid is discharged in advance, so that the problems that the heat transfer efficiency of the rotary kiln is reduced, the heating is uneven and the like due to the fact that the pyrolysis liquid is coked in the high-temperature environment of the third roller 500 after entering the third roller 500 are solved.
In some embodiments of the present invention, in step S200, the pyrolysis liquid is collected, and a fan is connected to an air nozzle on the pyrolysis liquid recycling device 400, so that the closed chamber 410 forms a negative pressure environment through the fan, and the pyrolysis liquid in the pores is sucked out.
In the thermal decomposition process, the air nozzle is connected with the fan, so that the closed chamber 410 forms a negative pressure environment, and the pyrolysis liquid can be added under the action of the negative pressure and is discharged from the pores.
In some embodiments of the present invention, step S200 further includes opening pores, and blowing out pyrolysis liquid retained in the pores in a reverse direction by using a blower to form a positive pressure environment in the closed chamber 410.
In order to prevent the pores from being blocked, the closed chamber 410 forms a positive pressure environment by the blower, and the pyrolysis liquid in the pores can be blown back to the second drum 300 in a reverse direction under the action of the positive pressure. The blocking of the pores by the pyrolysis liquid retained in the pores can be avoided.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A rotary kiln, comprising:
the first roller is provided with a first feeding hole and a first discharging hole;
the first material conveying mechanism is arranged in the first roller and used for discharging solid wastes entering from the first feeding hole from the first discharging hole;
the second roller is sleeved on the first roller, the first discharge port is positioned in the second roller, the second roller is provided with a pyrolysis liquid outlet and a solid waste outlet, and pyrolysis liquid in the second roller can flow out of the pyrolysis liquid outlet;
the second material conveying mechanism is arranged in the second roller and used for discharging the solid waste entering the second roller from the solid waste outlet;
the third roller is sleeved on the second roller, the solid waste outlet is positioned in the third roller, and the third roller is provided with a second discharge hole;
the third material conveying mechanism is arranged in the third roller and used for discharging solid wastes entering the third roller from the second discharge hole;
a heating system for regulating the temperature within the first, second and third drums.
2. The rotary kiln as claimed in claim 1, wherein: the second roller is a roller made of high-temperature-resistant porous ceramic.
3. The rotary kiln as claimed in claim 1, wherein: the second roller is of a double-layer roller wall structure and comprises an inner roller wall and an outer roller wall, a hole is formed in the inner roller wall, a pyrolysis oil leading-out channel is formed between the inner roller wall and the outer roller wall, the hole is communicated with the pyrolysis oil leading-out channel, and the pyrolysis liquid outlet is communicated with the pyrolysis oil leading-out channel.
4. A rotary kiln as claimed in claim 2 or 3, wherein: the cylinder diameter of the second roller is gradually increased from the solid waste outlet to the pyrolysis liquid outlet.
5. A rotary kiln as claimed in claim 2 or 3, wherein: still include pyrolysis liquid recovery unit, pyrolysis liquid recovery unit is equipped with the recovery chamber, it is in to retrieve the sealed suit in chamber on the second cylinder, so that retrieve the chamber with form an airtight cavity between the second cylinder, just the pyrolysis liquid export is located in the airtight cavity.
6. The rotary kiln as claimed in claim 1, wherein:
the first roller is horizontally arranged, the first material conveying mechanism comprises a first spiral blade, and the first spiral blade is arranged on the inner wall of the first roller;
the second roller is horizontally arranged, the second material conveying mechanism comprises a second spiral blade, the second spiral blade is arranged on the inner wall of the second roller, and the spiral direction of the second spiral blade is opposite to that of the first spiral blade;
the third roller is horizontally arranged, the third material conveying mechanism comprises a third helical blade, the third helical blade is arranged on the inner wall of the third roller, and the helical direction of the third helical blade is the same as that of the first helical blade;
the first roller, the second roller and the third roller are driven by the driving device to coaxially rotate in the same direction.
7. A solid waste treatment system is characterized in that: comprising a rotary kiln according to any one of claims 1 to 6.
8. A solid waste treatment method characterized by comprising the rotary kiln according to any one of claims 1 to 6, and performing solid waste treatment by:
s100: drying and preheating, namely throwing the solid waste into the first roller from the first feeding hole, discharging the solid waste entering the first roller from the first discharging hole under the action of the first material conveying mechanism, and simultaneously regulating and controlling the temperature in the first roller by the heating system to dry and preheat the solid waste of the first roller;
s200: performing thermal decomposition, wherein the second material conveying mechanism discharges the solid waste entering the second roller from the solid waste outlet, meanwhile, the heating system regulates and controls the temperature in the second roller to reach the thermal decomposition temperature, the thermal decomposition is performed on the solid waste in the second roller, and the pyrolysis liquid obtained by thermal decomposition flows out from the pyrolysis liquid outlet;
s300: and drying shrinkage and carbonization, wherein the third material conveying mechanism discharges the solid waste entering the third roller from the second discharge port, and meanwhile, the heating system regulates and controls the temperature in the third roller to the drying shrinkage and carbonization temperature, so that the solid waste in the third roller is subjected to drying shrinkage and carbonization.
9. The solid waste treatment method according to claim 8, characterized in that: and in the step S200, collecting pyrolysis liquid, connecting a fan with an air nozzle on the pyrolysis liquid recovery device, and enabling the closed chamber to form a negative pressure environment through the fan to suck out the pyrolysis liquid in the pores.
10. The solid waste treatment method according to claim 9, characterized in that: and step S200, dredging pores, forming a positive pressure environment in the closed chamber through the fan, and reversely blowing out pyrolysis liquid retained in the pores.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211512945.2A CN115725311A (en) | 2022-11-28 | 2022-11-28 | Rotary kiln, solid waste treatment system and solid waste treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211512945.2A CN115725311A (en) | 2022-11-28 | 2022-11-28 | Rotary kiln, solid waste treatment system and solid waste treatment method |
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|---|---|
| CN115725311A true CN115725311A (en) | 2023-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211512945.2A Pending CN115725311A (en) | 2022-11-28 | 2022-11-28 | Rotary kiln, solid waste treatment system and solid waste treatment method |
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| Country | Link |
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| CN (1) | CN115725311A (en) |
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2022
- 2022-11-28 CN CN202211512945.2A patent/CN115725311A/en active Pending
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