A vehicle-mounted continuous pyrolysis gasification device and method

Abstract

The present invention discloses a vehicle-mounted continuous pyrolysis gasification device and method. The device includes a double-rotating pyrolysis chamber, a material lifting blade, a material crushing blade, a screening device, a gasification chamber, a compression device, etc. Medical waste undergoes pyrolysis in the double-rotating pyrolysis chamber; the spiral material lifting blade fixed to the wall of the pyrolysis chamber lifts the material by rotation, thereby achieving full circulation of the medical waste inside the pyrolysis chamber and uniformly heating it; the reversely rotating material crushing blade peels off the residual carbon on the surface of the material by shearing and crushing, thereby enhancing heat transfer; the residual carbon screened by the screening device is further gasified in the gasification chamber, and the remaining inorganic waste residue is finally collected and landfilled after passing through a compression device; the pyrolysis gas and gasification gas generated by the device can be used for combustion energy supply and fuel cell power generation, thereby achieving self-sustaining operation of the device. The above device can be effectively miniaturized to adapt to vehicle-mounted operation, can timely and thoroughly perform high-temperature disinfection on medical waste, and can curb the generation of harmful substances such as dioxins, thereby achieving harmless disposal.

Description

Technical Field

[0001] The present invention belongs to the technical field of harmless treatment of medical waste, and specifically relates to a vehicle-mounted continuous pyrolysis and gasification device. The present invention also provides a method for realizing the vehicle-mounted continuous pyrolysis and gasification. Background Art

[0002] Medical waste may carry infectious germs and needs to be disinfected in a timely manner.

[0003] High-temperature incineration is currently the most reliable means of treating medical waste. Although incineration treatment technology is thorough in disinfection and sterilization, has high weight and volume reduction efficiency, is highly adaptable to various types of medical waste, and has good scale effects, the method's tail gas disposal is relatively difficult, especially the production of toxic dioxins, which can lead to serious environmental pollution problems.

[0004] Pyrolysis and gasification are highly efficient organic waste treatment technologies. The use of pyrolysis technology to dispose of medical waste also has the advantages of high treatment efficiency, wide adaptability, and thorough disinfection. In particular, since pyrolysis is an anaerobic process, it can dechlorinate harmlessly, that is, under low temperature conditions, its reducing atmosphere can effectively prevent the conversion of chlorine-containing components into harmful substances such as dioxins, avoiding secondary pollution. In addition, the pyrolysis process can be used to prepare high-value chemicals or fuels, and combined with gasification technology, pyrolysis carbon can be further used to produce gasification gas for fuel cell power generation, realizing the resource utilization of medical waste. Therefore, pyrolysis gasification technology has higher practical value than high-temperature incineration treatment technology.

[0005] However, medical waste has the characteristics of wide distribution, non-concentration, small single-time output, and cannot be stored for a long time. Since the conditions for investing in large-scale medical waste treatment facilities are not available under the above circumstances, it is necessary to develop corresponding miniaturized vehicle-mounted disposal equipment.

[0006] Conventional pyrolysis devices mainly include fluidized beds, fixed beds, rotary reactors, etc. Fluidized bed pyrolysis reactors require complex auxiliary equipment such as air distribution and separation, and are difficult to miniaturize. Fixed bed reactors, such as Chinese patent applications CN201210202172.8 and CN 202111123398.4, can be miniaturized for vehicle-mounted use, but there are problems with uneven heating of materials and adhesion of materials during the pyrolysis process. Rotary pyrolysis devices can be divided into internal rotation reactors with shaft rotation and external rotation reactors with reaction chamber rotation. They can assist in stirring materials through rotation to make them evenly heated. However, a single external rotation reactor, such as Chinese patent application CN 202010051988.X, has the problem of insufficient stirring intensity leading to material adhesion during pyrolysis and large discharge particles leading to incomplete pyrolysis; while a single internal rotation reactor, such as Chinese patent application CN201910417628.4, the stirring device only stirs the materials in the stirring rotation plane, and the collision effect of materials between different layers in the furnace is weak, making it difficult for the materials to be completely pyrolyzed. Even if the two types of rotary devices are simply combined, it is difficult to overcome the problem that heat is difficult to penetrate into the material and the material sticks together. Therefore, it is urgent to design a small-scale continuous pyrolysis device that can enhance heat exchange and prevent sticking by crushing medical waste, and organically combine it with a gasification-power generation device to adapt to vehicle-mounted conditions. Summary of the invention

[0007] The present invention mainly solves the technical problem that the existing pyrolysis reaction devices have shortcomings such as uneven heat transfer, easy adhesion of materials, and difficulty in miniaturization, and cannot effectively achieve timely and efficient disposal of medical waste. A vehicle-mounted continuous pyrolysis gasification device and method are provided.

[0008] In order to solve the above technical problems, the present invention provides a vehicle-mounted continuous pyrolysis gasification device, comprising an external shell, the external shell is formed with a feed inlet, a pyrolysis gas outlet, a flue gas inlet and a flue gas outlet, the flue gas inlet is connected to a gas engine to receive the flue gas generated by the gas engine, and the flue gas outlet is connected to an exhaust gas purification device;

[0009] A double-rotating reactor, the double-rotating reactor comprising a double-rotating pyrolysis chamber rotatably mounted in the outer shell and the stirring shaft extending along the rotation axis of the double-rotating pyrolysis chamber, wherein the rotation axis of the double-rotating pyrolysis chamber is inclined relative to the vertical direction, and a spiral material-lifting blade extending around the rotation axis is connected to the inner wall surface, and the feed inlet and the pyrolysis gas outlet are respectively connected to the inner cavity of the double-rotating pyrolysis chamber; a material-crushing blade is arranged on the stirring shaft, and the material-crushing blade is composed of a plurality of stirring rods or plate-type stirring paddles with slots, and is distributed in the gap between the material-lifting blades and has an extension length smaller than the inner diameter of the corresponding material-lifting blade on the rotation plane, so as to allow the stirring shaft to be driven to rotate in the opposite direction relative to the double-rotating pyrolysis chamber; and,

[0010] A gasification chamber is arranged in the external shell and connected to the lower end of the double-rotary pyrolysis chamber through a residual carbon channel to allow solid products generated by pyrolysis in the double-rotary pyrolysis chamber to enter the gasification chamber; the gasification chamber has a gasification agent inlet, a gasification gas outlet and a discharge port, and the gasification gas outlet is connected to the gasification gas inlet of the gas engine and the fuel cell via a gasification gas pipeline.

[0011] A flue, wherein the flue is arranged in the external shell and is divided into an upper chamber and a lower chamber, wherein the upper chamber is located in the area between the external shell and the double-rotation pyrolysis chamber, and the lower chamber is located in the area between the external shell and the gasification chamber; the upper chamber and the lower chamber are separated by the external shell and are only connected through a sub-high temperature flue gas channel; the flue gas inlet of the external shell is connected to the lower chamber of the flue, and the flue gas outlet of the external shell is connected to the upper chamber of the flue; the high-temperature flue gas introduced through the flue gas inlet of the external shell can pass through the lower chamber of the flue, the sub-high temperature flue gas channel and the upper chamber in sequence, and be discharged through the flue gas outlet of the external shell.

[0012] Preferably, a compression device is provided at the lower end of the discharge port and is connected to a solid collecting device, wherein the compression device comprises a spiral blade with a pitch gradually decreasing along the discharge direction.

[0013] Preferably, the pyrolysis gas outlet is connected to the pyrolysis gas inlet of the adsorption device via a pyrolysis gas pipeline, and is connected to the pyrolysis gas inlet of the gas engine through the adsorption device.

[0014] Preferably, heat exchange fins are arranged on the outer sides of the dual-rotation pyrolysis chamber and the gasification chamber, respectively; the gasification agent inlet and the discharge port are arranged at the lower end of the gasification chamber; and the gasification gas outlet is arranged on the residual carbon channel.

[0015] Preferably, the double-rotating pyrolysis chamber comprises a double-conical cylinder with cone bottoms connected to each other, and both ends of the double-conical cylinder are respectively connected to the external shell through bearings, wherein a screening device is provided at the lower end of the double-rotating pyrolysis chamber, and the solid products produced by pyrolysis in the double-rotating pyrolysis chamber enter the gasification chamber through the screening device.

[0016] Preferably, the vehicle-mounted continuous pyrolysis gasification device comprises an external rotary drive device which is transmission-connected to the double-rotating pyrolysis chamber and an internal rotary drive device which is transmission-connected to the stirring shaft, wherein the external rotary drive device is configured to drive the double-rotating pyrolysis chamber to rotate within the external shell and enable the lifting blades to transport at least part of the solid material within the double-rotating pyrolysis chamber upward; and the internal rotary drive device is configured to drive the stirring shaft to rotate in the opposite direction relative to the double-rotating pyrolysis chamber.

[0017] Preferably, the upper end of the lifting blade is at least 100 mm away from the feed inlet and the pyrolysis gas outlet, the lower end is close to the surface of the screening device, and the angle between the rotation axis of the double-rotating pyrolysis chamber and the horizontal plane is 30-60°.

[0018] The present invention also provides a method for using the above-mentioned vehicle-mounted continuous pyrolysis gasification device, wherein the pyrolysis and gasification stages are continuously operated, the medical waste is pyrolyzed in the double-rotating pyrolysis chamber to produce pyrolysis gas and pyrolysis carbon residue, and then the pyrolysis carbon residue directly enters the gasification chamber to be gasified to produce gasification gas and inorganic waste residue, comprising the following steps:

[0019] S1. As the medical waste removal vehicle is started, the on-board continuous pyrolysis gasification device starts to operate, driving the dual-rotating pyrolysis chamber to rotate and the stirring shaft to rotate in the opposite direction;

[0020] S2. The flue gas generated by the gas engine enters the flue to preheat the gasification chamber and the dual rotary pyrolysis chamber;

[0021] S3. continuously feeding the medical waste into the dual rotary pyrolysis chamber through the feed port, heating it, drying it to remove some of the moisture, and causing pyrolysis;

[0022] S4. The lifting blades of the double-rotating pyrolysis chamber rotate; driven by the lifting blades, the medical waste at the bottom is gradually lifted to the top along the inner wall of the double-rotating pyrolysis chamber, and then the medical waste falls from the middle of the double-rotating pyrolysis chamber back to the bottom; at the same time, the stirring shaft drives the crushing blades to rotate in the opposite direction of the double-rotating pyrolysis chamber, stirring and crushing the medical waste when it rises or falls, so that the medical waste is heated evenly, and the residual carbon that is fully pyrolyzed on the surface is continuously peeled off; the residual carbon fragments with smaller volume produced by peeling continuously move downward in the double-rotating pyrolysis chamber, pass through the screening device, and are discharged into the gasification chamber through the residual carbon channel; while the medical waste with a size not less than the predetermined size is hindered by the screening device, stays in the double-rotating pyrolysis chamber, and is scraped off by the lifting blades, and the above cycle process is continuously repeated until all of it is converted into pyrolysis residual carbon of a size not greater than the predetermined size after the pyrolysis is completed and discharged from the double-rotating pyrolysis chamber;

[0023] S5. Use the waste heat of flue gas to heat water to generate water vapor; in the gasification chamber, the pyrolysis residual carbon is gasified under the action of water vapor to generate gasification gas, until it is completely converted into inorganic waste residue and then discharged from the gasification chamber through the discharge port; the inorganic waste residue is compressed by the compression device and discharged from the discharge port;

[0024] S6. The pyrolysis gas generated by the pyrolysis of medical waste enters the adsorption device through the pyrolysis gas outlet, and is burned in the gas engine after being dechlorinated by the adsorption device, providing power for the medical waste removal vehicle and providing high-temperature flue gas for the on-board continuous pyrolysis gasification device; the gasification gas generated by the pyrolysis residual carbon gasification, in addition to part of it being used for combustion energy supply, is also used to generate electricity in the fuel cell to provide electric energy for the removal vehicle and the device; the flue gas discharged through the flue gas outlet is purified in the exhaust gas purification device and then discharged.

[0025] Preferably, the amount of medical waste in the dual rotary pyrolysis chamber (4) does not exceed 2 / 3 of its volume, and the gasification temperature of the gasification chamber (10) is 800-1200°C, and the pyrolysis temperature of the dual rotary pyrolysis chamber (4) is 300-600°C.

[0026] The core of the vehicle-mounted continuous pyrolysis and gasification device for medical waste described in the technical solution of the present invention is a lifting blade whose diameter changes with the inner wall of the double-cone double-rotating pyrolysis chamber, a crushing blade arranged on a counter-rotating stirring shaft, and an integrated gasification device connected in series through a screening device. The medical waste first enters the double-rotating pyrolysis chamber and gradually undergoes pyrolysis; the spiral lifting blade can exert an upward lifting force along the cylinder wall to the medical waste in contact with it, so that the large particles of medical waste at the bottom of the cylinder are gradually lifted to the top of the cylinder along the inner wall of the stirring cylinder, and then due to the reduction in the diameter of the lifting blade, the medical waste is pushed to the middle of the stirring cylinder and falls back to the bottom of the cylinder; at the same time, the counter-rotating crushing blade can stir and crush the medical waste when it rises or falls, enhance heat transfer, and continuously peel off the surface pyrolysis-completed residual carbon; the smaller residual carbon fragments produced by peeling continuously move downward in the double-rotating pyrolysis chamber, are screened by size by the screening device, and are discharged into the gasification chamber through the residual carbon channel; and the residual carbon fragments with a large volume are continuously removed from the double-rotating pyrolysis chamber, and are discharged into the gasification chamber through the residual carbon channel through the screening device. Medical waste of a predetermined size is blocked by the screening device, stays in the double-rotating pyrolysis chamber, and is scraped off by the lifting blades close to the surface of the screening device, and the above cycle is repeated continuously; in the gasification chamber, the pyrolysis char is further gasified under the action of water vapor to produce gasification gas, until it is completely converted into inorganic waste residue and discharged from the gasification chamber from the discharge port; the inorganic waste residue is compressed by the spiral blades through the compression device, and its volume gradually decreases, and then it is collected in the solid collection device; the pyrolysis gas and gasification gas generated in the entire pyrolysis and gasification process are used for combustion energy supply and fuel cell power generation respectively, to meet the needs of the cleaning vehicle itself, and to achieve harmless treatment and resource utilization of medical waste. Its beneficial effects include:

[0027] 1. The process is simple and the treatment is timely: the collection and storage steps are omitted by vehicle-mounted operation, and the treatment of a small amount of medical waste is completed on the way between different medical waste collection and storage stations. At the same time, the equipment used in the present invention can be applied to medical waste of various components and sizes, without the need for deep sorting and crushing. The treatment steps are simple and suitable for miniaturization. It can achieve timely treatment of medical waste and reduce the possibility of pathogen infection.

[0028] 2. High temperature disinfection: Through the continuous pyrolysis and gasification process of medical waste at high temperature, it can be thoroughly sterilized and disinfected, achieving harmless treatment of medical waste.

[0029] 3. Weight and volume reduction: Through continuous pyrolysis and gasification, the volume and mass of medical waste are greatly reduced. Finally, the small amount of remaining inorganic waste residue can be directly landfilled harmlessly after compression.

[0030] 4. Clean operation: The pyrolysis gas generated by the pyrolysis of medical waste is burned to provide the power required by the cleaning vehicle and the heat required by the device. At the same time, the pyrolysis residual carbon is gasified with water vapor to produce gasification gas rich in hydrogen and methane, which can be used to generate electricity in fuel cells to provide electricity for the cleaning vehicle and the device. The overall self-operation of the medical waste cleaning vehicle can be achieved without providing additional energy, which is clean and environmentally friendly.

[0031] 5. Effective dechlorination: The pyrolysis process of medical waste is an anaerobic process that can produce reducing components such as H2 and CO. The temperature is low and the residence time is long enough to adsorb the chlorine element in the medical waste in the form of hydrogen chloride, which can effectively inhibit the formation of harmful substances such as dioxins from the source and achieve effective dechlorination of medical waste.

[0032] 6. High resource utilization rate: The pyrolysis residual carbon is further gasified to prepare gasification gas, which can be used for fuel cell power generation, thereby improving the resource utilization rate of medical waste.

[0033] 7. High heat utilization rate: By rationally arranging the pyrolysis and gasification areas, adapting to the decreasing trend of flue gas temperature, the heat utilization rate is improved.

[0034] 8. Uniform heat transfer to prevent sticking: The double-conical pyrolysis chamber is arranged obliquely, and the diameter of the lifting blade increases first and then decreases with the diameter of the rotating section where the pyrolysis chamber wall is located. This can provide thrust for medical waste, realize a large-scale circulation from the bottom to the top near the wall of the mixing drum and return from the top to the bottom in the middle of the drum, so that it is violently stirred to be heated evenly, and in the rapid collision of the crushing blades, large pieces of material are impacted and dispersed to prevent sticking.

[0035] 9. Crushing the surface carbon residue and high pyrolysis efficiency: A single external or internal rotation reactor can only stir the material. In the dual-rotation pyrolysis chamber of the present invention, the medical waste will be rapidly collided with the counter-rotating material-crushing blades while rising and falling along the inner wall of the pyrolysis chamber, which can be sheared and crushed to peel off the surface carbon residue of the medical waste, continuously exposing the unpyrolyzed part inside, and realizing enhanced heat transfer.

[0036] 10. The pyrolysis and gasification reaction conditions are easy to control: the working conditions of the pyrolysis chamber and the gasification chamber can be flexibly changed by adjusting the rotation speed of the internal and external drive devices, the flue gas temperature and distribution, the amount of gasifying agent, the mesh size of the screening device, etc., to adapt to the changes in the composition of medical waste.

[0037] 11. Automatic discharge to prevent blockage: The crushed residual carbon in the double-rotating pyrolysis chamber can be screened through the sieve holes of the screening device, and can fall into the gasification chamber through the residual carbon channel for gasification reaction, thereby realizing automatic discharge from the pyrolysis chamber to the gasification chamber; under the action of the lifting blades, large particle fragments accumulated on the surface of the screening device close to the bottom of the pyrolysis chamber are continuously scraped away, lifted and continue to participate in pyrolysis, which can prevent the material from sticking and causing the screening device to be blocked; the remaining inorganic waste slag in the gasification chamber automatically enters the discharge port under the action of gravity, is compacted by the compression device and then discharged, thereby realizing automatic discharge from the gasification chamber to the solid collection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of a vehicle-mounted continuous pyrolysis and gasification device provided in an embodiment of the present invention;

[0039] Figure 2 for Figure 1 A schematic diagram of the process flow of the vehicle-mounted continuous pyrolysis and gasification device;

[0040] Figure 3 A flow chart of the steps of a vehicle-mounted continuous pyrolysis and gasification method provided in an embodiment of the present invention.

[0041] [Description of main component symbols]

[0042] 1-feeding port; 2-pyrolysis gas outlet; 3-stirring shaft; 4-double-rotating pyrolysis chamber; 5-lifting blades; 6-crushing blades; 7-gasifying agent inlet; 8-discharging port; 9-compression device; 10-gasification chamber; 11-external shell; 12-flue; 13-residual carbon channel; 14-internal rotary drive device; 15-gasification gas outlet; 16-external rotary drive device; 17-screening device. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0044] In view of the existing problems, the present invention provides a vehicle-mounted continuous pyrolysis and gasification device and method, which can be miniaturized and suitable for vehicle-mounted, and has the characteristics of timely treatment, thorough disinfection, substantial weight and volume reduction, clean self-power supply, effective dechlorination, collision enhancement, uniform heat transfer, convenient regulation, automatic discharging, prevention of blockage and adhesion, etc., and can achieve timely harmless treatment of medical waste through continuous pyrolysis and gasification process.

[0045] In order to realize the above technical solution, Figure 1 and Figure 2 As shown, the vehicle-mounted continuous pyrolysis gasification device provided by the present invention has substantially the same device structure in each embodiment, including a feed inlet 1, a pyrolysis gas outlet 2, a stirring shaft 3, a double-rotating pyrolysis chamber 4, a lifting blade 5, a crushing blade 6, a gasifying agent inlet 7, a discharge port 8, a compression device 9, a gasification chamber 10, an external shell 11, a flue 12, a residual carbon channel 13, an internal rotary drive device 14, a gasification gas outlet 15, an external rotary drive device 16 and a screening device 17.

[0046] The double-rotating pyrolysis chamber 4 is a hollow double-conical stirring drum with an axial height of 2000 mm, a maximum diameter of 1400 mm, an upper end face diameter of 700 mm, and a lower end face diameter of 300 mm; the double-rotating pyrolysis chamber 4 and the stirring shaft 3 are coaxially arranged and inclined at an angle of 45°, and the diameter of the stirring shaft 3 is 50 mm; both ends of the double-rotating pyrolysis chamber 4 and the stirring shaft 3 are supported by bearings located on the external shell 11; the stirring drum of the double-rotating pyrolysis chamber 4 is driven to rotate by an external rotating drive device 16 (such as a motor), and the stirring shaft 3 is driven to rotate in the opposite direction by an internal rotating drive device 14 (such as a motor); the double-rotating pyrolysis chamber 4 is driven to rotate by an external rotating drive device 16 (such as a motor), and the stirring shaft 3 is driven to rotate in the opposite direction by an internal rotating drive device 14 (such as a motor); The upper end of the chamber 4 is connected to the feed port 1 and the pyrolysis gas outlet 2 respectively, and the diameter of the feed port 1 is 200mm; the lower end of the double-rotating pyrolysis chamber 4 is connected to the upper end of the residual carbon channel 13, and the length of the residual carbon channel 13 is 500mm; the screening device 17 is located on the connecting interface between the double-rotating pyrolysis chamber 4 and the residual carbon channel 13, and the sieve hole diameter of the screening device 17 is 5mm; the gasification gas outlet 15 is connected to the middle side of the residual carbon channel 13; the lower end of the residual carbon channel 13 is connected to the upper end of the gasification chamber 10; the lower end of the gasification chamber 10 is connected to the gasification agent inlet 7 and the discharge port 8 respectively; the lower part of the discharge port 8 is connected to the solid The pitch of the spiral blade of the compression device 9 is gradually reduced from 10mm to 3mm; the lifting blade 5 is a spiral ribbon blade, the outer side of which is fixed on the inner wall of the double-rotating pyrolysis chamber 4, the upper end of which is 100mm away from the feed inlet 1 and the pyrolysis gas outlet 2, and the lower end is connected to the lower end surface of the double-rotating pyrolysis chamber 4 and is close to the surface of the screening device; the thickness of the lifting blade 5 is 5mm, and the outer diameter changes with the change of the diameter of the inner wall of the double-rotating pyrolysis chamber, and its minimum inner diameter is 200mm; the crushing blade 6 is composed of 8 groups of stirring rods, each group of three, evenly distributed on the stirring shaft 3, and its outer diameter is the same as the inner diameter of the lifting blade 5. The diameter is close to each other with a gap of 2mm; the pyrolysis gas outlet 2 is connected to the pyrolysis gas inlet of the adsorption device through a pyrolysis gas pipeline, and the pyrolysis gas outlet of the adsorption device is connected to the pyrolysis gas inlet of the gas engine; the gasification gas outlet 15 is connected to the gasification gas inlet of the gas engine and the fuel cell through a gasification gas pipeline; the flue gas outlet of the gas engine is connected to the flue gas inlet of the external shell 11, and the flue gas outlet of the external shell 11 is connected to the exhaust gas purification device; the upper chamber and the lower chamber of the flue 12 are respectively formed between the external shell 11 and the double-rotating pyrolysis chamber 4 and the gasification chamber 10, and the upper and lower chambers are connected via a sub-high temperature flue gas channel.

[0047] The operation process of the medical waste removal vehicle using the above-mentioned vehicle-mounted continuous pyrolysis gasification device is described in detail below through specific embodiments.

[0048] Example 1

[0049] As the medical waste removal vehicle starts, the on-board pyrolysis gasification device starts to operate, and the motor is turned on to drive the stirring drum and the stirring shaft 3 of the dual-rotating pyrolysis chamber 4 to rotate, and the two rotate in opposite directions at a speed of 20r / min; the high-temperature flue gas generated by the gas engine enters the flue 12, preheats the gasification chamber 10 and the dual-rotating pyrolysis chamber 4, until the pyrolysis temperature reaches 500°C and the gasification temperature reaches 1000°C; the medical waste removal vehicle arrives at the medical waste collection and storage station, collects the medical waste from the collection and storage station into the silo, and continuously feeds it into the dual-rotating pyrolysis chamber 4 through the feed port 8 at 0.1t / h, maintaining the amount of medical waste in the dual-rotating pyrolysis chamber 4 at 2 / 3 of its volume; the medical waste is gradually The heat rises, pyrolysis occurs to produce pyrolysis gas, and the surface carbon residue is continuously stripped under the joint shearing and crushing action of the lifting blade 5 and the crushing blade 6; the carbon residue fragments are screened by the screening device 17 and enter the gasification chamber 10, and continue to be gasified by water vapor to generate gasification gas until it is completely converted into inorganic waste residue and then compressed and collected; the pyrolysis gas is dechlorinated by the adsorption device and then burned in the gas engine to provide power for the cleaning vehicle and high-temperature flue gas for the device, and the gasification gas, in addition to part of it being used for combustion energy supply, also generates electricity in the fuel cell to provide electricity for the cleaning vehicle and the device, effectively realizing self-sustaining operation; the low-temperature flue gas discharged from the flue is purified in the exhaust gas purification device and then emptied. The entire vehicle-mounted device is thoroughly sterilized and disinfected through continuous pyrolysis and gasification of medical waste, and the emission of harmful substances such as dioxins is curbed, with a weight reduction rate of 76.5wt%, achieving timely harmless treatment of medical waste and effectively preventing the spread of pathogens.

[0050] Example 2

[0051] As the medical waste removal vehicle starts, the on-board pyrolysis gasification device starts to operate, and the motor is turned on to drive the stirring drum and the stirring shaft 3 of the dual-rotating pyrolysis chamber 4 to rotate, and the two rotate in opposite directions at a speed of 25r / min; the high-temperature flue gas generated by the gas engine enters the flue 12, preheats the gasification chamber 10 and the dual-rotating pyrolysis chamber 4, until the pyrolysis temperature reaches 500°C and the gasification temperature reaches 1000°C; the medical waste removal vehicle arrives at the medical waste collection and storage station, collects the medical waste from the collection and storage station into the silo, and continuously feeds it into the dual-rotating pyrolysis chamber 4 through the feed port 8 at 0.1t / h, maintaining the amount of medical waste in the dual-rotating pyrolysis chamber 4 at 2 / 3 of its volume; the medical waste is gradually The heat rises, pyrolysis occurs to produce pyrolysis gas, and the surface carbon residue is continuously stripped under the joint shearing and crushing action of the lifting blade 5 and the crushing blade 6; the carbon residue fragments are screened by the screening device 17 and enter the gasification chamber 10, and continue to be gasified by water vapor to generate gasification gas until it is completely converted into inorganic waste residue and then compressed and collected; the pyrolysis gas is dechlorinated by the adsorption device and then burned in the gas engine to provide power for the cleaning vehicle and high-temperature flue gas for the device, and the gasification gas, in addition to part of it being used for combustion energy supply, is also used in the fuel cell to generate electricity to provide electricity for the cleaning vehicle and the device, effectively realizing self-sustaining operation; the low-temperature flue gas discharged from the flue is purified in the exhaust gas purification device and then emptied. The entire vehicle-mounted device is thoroughly sterilized and disinfected through continuous pyrolysis and gasification of medical waste, and the emission of harmful substances such as dioxins is curbed, with a weight reduction rate of 73.4wt%, achieving timely harmless treatment of medical waste and effectively preventing the spread of pathogens.

[0052] Example 3

[0053] As the medical waste removal vehicle starts, the on-board pyrolysis gasification device starts to operate, and the motor is turned on to drive the stirring drum and the stirring shaft 3 of the dual-rotating pyrolysis chamber 4 to rotate, and the two rotate in opposite directions at a speed of 20r / min; the high-temperature flue gas generated by the gas engine enters the flue 12, preheats the gasification chamber 10 and the dual-rotating pyrolysis chamber 4, until the pyrolysis temperature reaches 600°C and the gasification temperature reaches 1000°C; the medical waste removal vehicle arrives at the medical waste collection and storage station, collects the medical waste from the collection and storage station into the silo, and continuously feeds it into the dual-rotating pyrolysis chamber 4 through the feed port 8 at 0.1t / h, maintaining the amount of medical waste in the dual-rotating pyrolysis chamber 4 at 2 / 3 of its volume; the medical waste is gradually The heat rises, pyrolysis occurs to produce pyrolysis gas, and the surface carbon residue is continuously stripped under the joint shearing and crushing action of the lifting blade 5 and the crushing blade 6; the carbon residue fragments are screened by the screening device 17 and enter the gasification chamber 10, and continue to be gasified by water vapor to generate gasification gas until it is completely converted into inorganic waste residue and then compressed and collected; the pyrolysis gas is dechlorinated by the adsorption device and then burned in the gas engine to provide power for the cleaning vehicle and high-temperature flue gas for the device, and the gasification gas, in addition to part of it being used for combustion energy supply, also generates electricity in the fuel cell to provide electricity for the cleaning vehicle and the device, effectively realizing self-sustaining operation; the low-temperature flue gas discharged from the flue is purified in the exhaust gas purification device and then emptied. The entire vehicle-mounted device is thoroughly sterilized and disinfected through continuous pyrolysis and gasification of medical waste, and the emission of harmful substances such as dioxins is curbed, with a weight reduction rate of 80.6wt%, achieving timely harmless treatment of medical waste and effectively preventing the spread of pathogens.

[0054] Example 4

[0055] As the medical waste removal vehicle starts, the on-board pyrolysis gasification device starts to operate, and the motor is turned on to drive the stirring drum and the stirring shaft 3 of the dual-rotating pyrolysis chamber 4 to rotate, and the two rotate in opposite directions at a speed of 30r / min; the high-temperature flue gas generated by the gas engine enters the flue 12, preheats the gasification chamber 10 and the dual-rotating pyrolysis chamber 4, until the pyrolysis temperature reaches 600°C and the gasification temperature reaches 1200°C; the medical waste removal vehicle arrives at the medical waste collection and storage station, collects the medical waste from the collection and storage station into the silo, and continuously feeds it into the dual-rotating pyrolysis chamber 4 through the feed port 8 at 0.1t / h, maintaining the amount of medical waste in the dual-rotating pyrolysis chamber 4 at 2 / 3 of its volume; the medical waste is gradually The heat rises, pyrolysis occurs to produce pyrolysis gas, and the surface carbon residue is continuously stripped under the joint shearing and crushing action of the lifting blade 5 and the crushing blade 6; the carbon residue fragments are screened by the screening device 17 and enter the gasification chamber 10, and continue to be gasified by water vapor to generate gasification gas until it is completely converted into inorganic waste residue and then compressed and collected; the pyrolysis gas is dechlorinated by the adsorption device and then burned in the gas engine to provide power for the cleaning vehicle and high-temperature flue gas for the device, and the gasification gas, in addition to part of it being used for combustion energy supply, also generates electricity in the fuel cell to provide electricity for the cleaning vehicle and the device, effectively realizing self-sustaining operation; the low-temperature flue gas discharged from the flue is purified in the exhaust gas purification device and then emptied. The entire vehicle-mounted device is thoroughly sterilized and disinfected through continuous pyrolysis and gasification of medical waste, and the emission of harmful substances such as dioxins is curbed, with a weight reduction rate of 83.7wt%, achieving timely harmless treatment of medical waste and effectively preventing the spread of pathogens.

[0056] In the description of the present invention, the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present invention; unless otherwise clearly specified and limited, the terms "connected", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] For the above-mentioned embodiments of the present invention, the common knowledge such as the known specific structures and characteristics in the scheme is not described in detail; each embodiment is described in a progressive manner, and the technical features involved in each embodiment can be combined with each other under the premise that there is no conflict between each other, and the same and similar parts between the embodiments can be referred to each other. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention, and these improvements and modifications should also be regarded as falling within the scope of protection of the present invention.

Claims

1. A vehicle-mounted continuous pyrolysis gasification device, characterized in that: include: An external shell (11), the external shell (11) being formed with a feed inlet (1), a pyrolysis gas outlet (2), a flue gas inlet and a flue gas outlet, the flue gas inlet being connected to a gas engine so as to receive flue gas generated by the gas engine, and the flue gas outlet being connected to an exhaust gas purification device; A double-rotating reactor, the double-rotating reactor comprising a double-rotating pyrolysis chamber (4) rotatably mounted in the outer shell (11) and a stirring shaft (3) extending along the rotation axis of the double-rotating pyrolysis chamber (4), wherein the rotation axis of the double-rotating pyrolysis chamber (4) is inclined relative to the vertical direction, and a spiral material lifting blade (5) extending around the rotation axis is connected to the inner wall surface, and the feed inlet (1) and the pyrolysis gas outlet (2) are respectively connected to the inner cavity of the double-rotating pyrolysis chamber (4); a material crushing blade (6) is provided on the stirring shaft (3), and the material crushing blade (6) is composed of a plurality of stirring rods or plate-type stirring paddles with slots, and is distributed in the gaps of the material lifting blades (5) and has an extension length smaller than the inner diameter of the corresponding material lifting blade (5) on the rotation plane, so as to allow the stirring shaft (3) to be driven to rotate in the opposite direction relative to the double-rotating pyrolysis chamber (4); A gasification chamber (10), the gasification chamber (10) being arranged in the outer shell (11) and connected to the lower end of the double rotary pyrolysis chamber (4) through a residual carbon channel (13), so as to allow solid products generated by pyrolysis in the double rotary pyrolysis chamber (4) to enter the gasification chamber (10); the gasification chamber (10) having a gasification agent inlet (7), a gasification gas outlet (15) and a discharge port (8), the gasification gas outlet (15) being connected to a gasification gas inlet of a gas engine and a fuel cell via a gasification gas pipeline; and, A flue (12), the flue (12) being arranged in the outer shell (11) and being divided into an upper chamber and a lower chamber, wherein the upper chamber is located in a region between the outer shell (11) and the double-rotating pyrolysis chamber (4), and the lower chamber is located in a region between the outer shell (11) and the gasification chamber (10); the upper chamber and the lower chamber are separated by the outer shell (11) and are connected only through a sub-high temperature flue gas channel; the flue gas inlet of the outer shell (11) is connected to the lower chamber of the flue (12), and the flue gas outlet of the outer shell (11) is connected to the upper chamber of the flue (12); the high-temperature flue gas introduced through the flue gas inlet of the outer shell (11) can sequentially pass through the lower chamber of the flue (12), the sub-high temperature flue gas channel and the upper chamber, and be discharged through the flue gas outlet of the outer shell (11); The double-rotating pyrolysis chamber (4) comprises a double-conical cylinder with conical bottoms connected to each other, and both ends of the double-conical cylinder are connected to the external shell (11) via bearings, wherein a screening device (17) is provided at the lower end of the double-rotating pyrolysis chamber (4), and solid products generated by pyrolysis in the double-rotating pyrolysis chamber (4) enter the gasification chamber (10) through the screening device (17).

2. The vehicle-mounted continuous pyrolysis gasification device according to claim 1, characterized in that: A compression device (9) is provided at the lower end of the discharge port (8) and is connected to a solid collection device, wherein the compression device (9) comprises a spiral blade with a pitch that gradually decreases along the discharge direction.

3. The vehicle-mounted continuous pyrolysis gasification device according to claim 1, characterized in that: The pyrolysis gas outlet (2) is connected to the pyrolysis gas inlet of the adsorption device via a pyrolysis gas pipeline, and is connected to the pyrolysis gas inlet of the gas engine via the adsorption device.

4. The vehicle-mounted continuous pyrolysis gasification device according to claim 1, characterized in that: Heat exchange fins are arranged on the outside of the dual-rotating pyrolysis chamber (4) and the gasification chamber (10), respectively; the gasification agent inlet (7) and the discharge port (8) are arranged at the lower end of the gasification chamber (10); and the gasification gas outlet (15) is arranged on the residual carbon channel (13).

5. The vehicle-mounted continuous pyrolysis gasification device according to claim 1, characterized in that: The vehicle-mounted continuous pyrolysis gasification device comprises an external rotary drive device (16) which is transmission-connected to the dual-rotation pyrolysis chamber (4) and an internal rotary drive device (14) which is transmission-connected to the stirring shaft (3); the external rotary drive device (16) is configured to be able to drive the dual-rotation pyrolysis chamber (4) to rotate within the external shell (11) and enable the lifting blades (5) to transport at least part of the solid material within the dual-rotation pyrolysis chamber (4) upward; and the internal rotary drive device (14) is configured to be able to drive the stirring shaft (3) to rotate in the opposite direction relative to the dual-rotation pyrolysis chamber (4).

6. The vehicle-mounted continuous pyrolysis gasification device according to claim 1, characterized in that: The upper end of the lifting blade (5) is at least 100 mm away from the feed inlet (1) and the pyrolysis gas outlet (2), the lower end is in close contact with the surface of the screening device, and the angle between the rotation axis of the double-rotating pyrolysis chamber (4) and the horizontal plane is 30 to 60 degrees.

7. A method for pyrolysis and gasification using the vehicle-mounted continuous pyrolysis and gasification device according to any one of claims 1 to 6, characterized in that: The two stages of pyrolysis and gasification are operated continuously, and the medical waste is pyrolyzed in the double-rotating pyrolysis chamber to produce pyrolysis gas and pyrolysis carbon residue, and then the pyrolysis carbon residue directly enters the gasification chamber to be gasified to produce gasification gas and inorganic waste residue, including the following steps: S1. As the medical waste removal vehicle is started, the on-board continuous pyrolysis gasification device starts to operate, driving the dual-rotating pyrolysis chamber to rotate and the stirring shaft to rotate in opposite directions; S2. The flue gas generated by the gas engine enters the flue to preheat the gasification chamber and the dual rotary pyrolysis chamber; S3. The medical waste is continuously fed into the dual rotary pyrolysis chamber through the feed port, so that it is heated, dried to remove part of the moisture, and pyrolysis occurs; S4. The lifting blades of the double-rotating pyrolysis chamber rotate; driven by the lifting blades, the medical waste at the bottom is gradually lifted to the top along the inner wall of the double-rotating pyrolysis chamber, and then the medical waste falls from the middle of the double-rotating pyrolysis chamber back to the bottom; at the same time, the stirring shaft drives the crushing blades to rotate in the opposite direction of the double-rotating pyrolysis chamber, stirring and crushing the medical waste when it rises or falls, so that the medical waste is heated evenly, and the charcoal residue that is fully pyrolyzed on the surface is continuously peeled off; the charcoal residue fragments with smaller volume produced by peeling continuously move downward in the double-rotating pyrolysis chamber, pass through the screening device, and are discharged into the gasification chamber through the charcoal residue channel; while the medical waste with a size not less than the predetermined size is hindered by the screening device, stays in the double-rotating pyrolysis chamber, and is scraped off by the lifting blades, and the cycle process is repeated continuously until all of it is converted into pyrolysis charcoal residue of a size not greater than the predetermined size after pyrolysis is completed and discharged from the double-rotating pyrolysis chamber; S5. Use the waste heat of flue gas to heat water to generate water vapor; in the gasification chamber, the pyrolysis carbon residue is gasified under the action of water vapor to generate gasification gas, until it is completely converted into inorganic waste residue and then discharged from the gasification chamber through the discharge port; the inorganic waste residue is compressed by the compression device and discharged from the discharge port; S6. The pyrolysis gas generated by the pyrolysis of medical waste enters the adsorption device through the pyrolysis gas outlet, and is burned in the gas engine after being dechlorinated by the adsorption device, providing power for the medical waste removal vehicle and providing high-temperature flue gas for the on-board continuous pyrolysis gasification device; the gasification gas generated by the pyrolysis residual carbon gasification, in addition to part of it being used for combustion energy supply, is also used to generate electricity in the fuel cell to provide electric energy for the removal vehicle and the device; the flue gas discharged through the flue gas outlet is purified in the exhaust gas purification device and then discharged.

8. The vehicle-mounted continuous pyrolysis and gasification method according to claim 7, characterized in that: The amount of medical waste in the dual-rotation pyrolysis chamber (4) does not exceed 2 / 3 of its volume, the gasification temperature of the gasification chamber (10) is 800-1200° C., and the pyrolysis temperature of the dual-rotation pyrolysis chamber (4) is 300-600° C.

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