Dioxin catalytic cracking system
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU ENG CO LTD OF CHINA LIGHT IND
- Filing Date
- 2025-04-17
- Publication Date
- 2026-05-26
AI Technical Summary
Existing technologies for treating dioxins in waste incineration fly ash suffer from low removal efficiency, high energy consumption, and the potential for dioxins to re-synthesize during the cooling process.
Design a dioxin catalytic cracking system, including a feeding device, a rotary kiln, a discharging device, a heating device, a jetting device, and a cooling device. Solid dioxins are converted into gaseous state through staged heating, and after cracking at high temperature, they are mixed with room temperature water and rapidly cooled to prevent the resynthesis of dioxins, while the system heat is recycled.
It improves the removal rate of dioxins, reduces system energy consumption, and effectively prevents the regeneration of dioxins.
Smart Images
Figure CN224284624U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of pollutant treatment, and more specifically, to a dioxin catalytic cracking system. Background Technology
[0002] During waste incineration, fly ash with a particle size of less than 100μm is produced. The product after these fly ashes are washed with water or chemically treated to remove soluble chloride salts is called desalinated fly ash.
[0003] Dioxins in fly ash are mainly adsorbed on the surface of particles in solid form. They are extremely stable (decomposition temperature requires above 800℃) and have strong carcinogenicity and bioaccumulation. Although traditional solidification landfill or cement kiln co-processing can reduce the risk of leaching, it does not completely eliminate dioxin toxicity and may be released through leachate or high-temperature resynthesis.
[0004] Solid dioxins turn into a gaseous state at high temperatures and decompose at temperatures above 850°C. Therefore, dioxin treatment can be carried out using either solid-state or gaseous methods, but gaseous treatment is simpler, more efficient, and more thorough, and is therefore usually chosen. Even if dioxins decompose at high temperatures, destroying their molecular structure and thus removing them, the decomposed dioxins may recombine during the cooling process, when the temperature drops to 300-500°C. This limits the overall dioxin removal efficiency, resulting in a large amount of dioxins remaining, and the process is energy-intensive due to its high temperature. Therefore, it is necessary to design a treatment system with controllable energy consumption and higher dioxin removal efficiency. Utility Model Content
[0005] The purpose of this invention is to provide a dioxin catalytic cracking system that can not only effectively recover and utilize the system's heat, but also effectively improve the dioxin removal rate.
[0006] This utility model is achieved through the following technical solution: The dioxin catalytic cracking system of this utility model includes a feeding device, a rotary kiln, a discharging device, a heating device, a jetting device, and a cooling device arranged in sequence; the gas outlet of the discharging device is connected to the heating device; it also includes a heat exchange device connected to the discharging end of the discharging device, a transmission device connected to the outlet end of the heat exchange device, and a waste heat pipe connected to the gas outlet end of the heat exchange device; the waste heat pipe is connected to the feeding device.
[0007] Furthermore, the feeding device includes a feeding tank, a first feeder located at the upper end of the feeding tank, a second feeder located at the lower end of the feeding tank, and an exhaust pipe located at the upper end of the feeding tank; the second feeder is connected to the feed inlet of the rotary kiln, and the exhaust pipe is connected to a dust collector.
[0008] Furthermore, the rotary kiln includes a horizontally arranged furnace body, a plurality of electromagnetic heaters disposed on the furnace body, a plurality of temperature detection devices disposed on the furnace body, a waste heat branch pipe disposed at the feed end of the furnace body, and a regulating valve disposed on the waste heat branch pipe; the waste heat branch pipe is connected to the waste heat pipe.
[0009] Furthermore, the discharge device includes a vertically arranged discharge tank; the discharge tank is connected to the discharge end of the furnace body; the lower end of the discharge tank is connected to the heat exchange device, and the upper end of the discharge tank is connected to the heating device.
[0010] Furthermore, the heating device includes a heating tank, a heating tube disposed in the heating tank, and a heating device for heating the heating tube; one end of the heating tube is connected to the discharge device, and the other end is connected to the jetting device.
[0011] Furthermore, the jetting device includes a jetting nozzle, a high-pressure water pipe located at the inlet end of the jetting nozzle, a water pump connected to the high-pressure water pipe, and a mixing pipe located at the outlet end of the jetting nozzle; the heating pipe is connected to the side wall at the inlet end of the jetting nozzle, and the end of the mixing pipe away from the jetting nozzle is located in the cooling device.
[0012] Furthermore, the cooling device includes a cooling tower, a spray device located at the upper end of the cooling tower, an exhaust pipe located at the upper end of the cooling tower, a filter located in the exhaust pipe, and a sedimentation tank located at the lower end of the cooling tower.
[0013] Furthermore, the heat exchange device includes a heat exchange tank connected to the discharge device and a blower connected to the side wall of the heat exchange tank; the transmission device includes a conveyor belt located at the lower end of the heat exchange tank; the blower is connected to the upper side wall of the heat exchange tank, and the waste heat pipe is connected to the lower side wall of the heat exchange tank.
[0014] The technical solution of this utility model has at least the following advantages and beneficial effects: The dioxin catalytic cracking system of this utility model feeds fly ash desalination products into a feeding device, which then feeds the raw material into a rotary kiln at a certain rate. In the rotary kiln, the raw material is gradually heated, causing the harmful residual solid dioxins to turn into a gaseous state. The solid material and gaseous dioxins in the rotary kiln then enter a discharge device, which sends the gaseous dioxins into a heating device and the solid material into a heat exchange device. The dioxin gas entering the heating device is further heated (above 850°C), causing dioxin gas cracking. The cracked gas enters a jet device, mixes with room temperature water, is rapidly cooled, and then injected into a cooling system for rapid cooling and discharge. This effectively prevents the memory reformation of dioxins and improves the dioxin removal rate. The solid material entering the heat exchange device has its heat transferred back to the feeding device, preheating the material. This system not only efficiently treats dioxins in fly ash desalination products, but also effectively recycles the heat generated by the system, reducing the overall energy consumption of the system. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the dioxin catalytic cracking system provided in an embodiment of the present invention;
[0016] Figure 2 A schematic diagram of the front half of the dioxin catalytic cracking system provided in this embodiment of the present invention;
[0017] Figure 3 This is a schematic diagram of the structure of the latter half of the dioxin catalytic cracking system provided in an embodiment of the present invention.
[0018] Icons: 10-Feeding device, 11-Feed tank, 12-First feeder, 13-Second feeder, 14-Exhaust pipe, 20-Rotary furnace, 21-Furnace body, 22-Electromagnetic heater, 23-Temperature detection device, 24-Waste heat branch pipe, 25-Regulating valve, 30-Discharge device, 31-Discharge tank, 40-Heating device, 41-Heating tank, 42-Heating tube, 50-Jet device, 51-Jeter, 52-High-pressure water pipe, 53-Mixing pipe, 60-Cooling device, 61-Cooling tower, 62-Spraying device, 63-Exhaust pipe, 64-Sedimentation tank, 70-Heat exchange device, 71-Heat exchange tank, 72-Blower, 73-Waste heat tube, 80-Transmission device. Detailed Implementation
[0019] Example
[0020] The following description, in conjunction with specific embodiments, further illustrates the points, as shown in the appendix. Figure 1 -Appendix Figure 3As shown, the dioxin catalytic cracking system of this embodiment includes a feeding device 10, a rotary kiln 20, a discharging device 30, a heating device 40, a jetting device 50, and a cooling device 60 arranged in sequence; the gas outlet of the discharging device 30 is connected to the heating device 40; it also includes a heat exchange device 70 connected to the discharging end of the discharging device 30, a transmission device 80 connected to the outlet end of the heat exchange device 70, and a waste heat pipe 73 connected to the gas outlet of the heat exchange device 70; the waste heat pipe 73 is connected to the feeding device 10. Specifically, the fly ash desalination product is fed into the feeding device 10, which feeds the raw material into the rotary kiln 20 at a certain rate. In the rotary kiln 20, the raw material is gradually heated, causing the harmful residual solid dioxins to turn into a gaseous state. The solid material and gaseous dioxins in the rotary kiln 20 then enter the discharge device 30. The discharge device 30 sends the gaseous dioxins into the heating device 40, and the solid material into the heat exchange device 70. The dioxin gas in the heating device 40 is further heated (above 850°C), causing it to decompose. The decomposed gas enters the jetting device 50, mixes with room temperature water, is rapidly cooled, and then injected into a cooling system for rapid cooling and discharge. This effectively prevents the reformation of dioxins. The solid material entering the heat exchange device 70 has its heat transferred back to the feeding device 10, preheating the material. This system not only efficiently treats dioxins in fly ash desalination products, but also effectively recycles the heat generated by the system, reducing the overall energy consumption of the system.
[0021] The feeding device 10 in this embodiment includes a feeding tank 11, a first feeder 12 located at the upper end of the feeding tank 11, a second feeder 13 located at the lower end of the feeding tank 11, and an exhaust pipe 14 located at the upper end of the feeding tank 11. The second feeder 13 is connected to the feed inlet of the rotary kiln 20, and the exhaust pipe 14 is connected to a dust collector. Specifically, the first feeder 12 feeds the material into the feeding tank 11 at a uniform speed, and the second feeder 13 transports the material in the feeding tank 11 into the rotary kiln 20. The high-temperature gas entering the feeding tank 11 from the waste heat pipe 73 preheats the material in the feeding tank 11. The preheated gas is discharged through the exhaust pipe 14 and discharged into the environment after being cleaned by the dust collector.
[0022] The rotary kiln 20 in this embodiment includes a horizontally arranged furnace body 21, multiple electromagnetic heaters 22 mounted on the furnace body 21, multiple temperature detection devices 23 mounted on the furnace body 21, a waste heat branch pipe 24 located at the feed end of the furnace body 21, and a regulating valve 25 mounted on the waste heat branch pipe 24; the waste heat branch pipe 24 is connected to the waste heat pipe 73. Specifically, by heating the material in the rotary kiln 20 step by step using multiple electromagnetic heaters 22, the reaction process of the material can be effectively controlled. The gas entering the rotary kiln 20 through the waste heat branch pipe 24 creates a positive pressure at the feed end of the rotary kiln 20, thereby promoting the normal flow of material and gas in the rotary kiln 20.
[0023] The discharge device 30 in this embodiment includes a vertically arranged discharge tank 31; the discharge tank 31 is connected to the discharge end of the furnace body 21; the lower end of the discharge tank 31 is connected to the heat exchange device 70, and the upper end of the discharge tank 31 is connected to the heating device 40. Specifically, the solid material and dioxin gas generated by the furnace body 21 are discharged into the discharge tank 31, wherein the solid material is discharged from the lower end into the heat exchange device 70, and the dioxin gas enters the heating device 40 from the upper end.
[0024] The heating device 40 in this embodiment includes a heating tank 41, a heating tube 42 disposed in the heating tank 41, and a heating device 40 for heating the heating tube 42; one end of the heating tube 42 is connected to the discharge device 30, and the other end is connected to the jet device 50. Specifically, the dioxin gas discharged from the rotary kiln 20 into the discharge tank 31 and from the discharge tank 31 into the heating tube 42 is approximately 600°C. The heating device 40 (which can be an electromagnetic heater) heats the heating tube 42 and the dioxin gas therein, raising the temperature of the dioxin gas to above 850°C, causing it to crack. The cracked gas is then sent to the jet device 50 for rapid cooling.
[0025] The jetting device 50 in this embodiment includes a jetting nozzle 51, a high-pressure water pipe 52 located at the inlet end of the jetting nozzle 51, a water pump connected to the high-pressure water pipe 52, and a mixing pipe 53 located at the outlet end of the jetting nozzle 51. A heating pipe 42 is connected to the side wall at the inlet end of the jetting nozzle 51, and the end of the mixing pipe 53 away from the jetting nozzle 51 is located in a cooling device 60. Specifically, the water pump delivers high-pressure water through the high-pressure water pipe 52 into the jetting pipe, while the heating pipe 42 delivers high-temperature gas into the jetting pipe. After the two mix, the high-temperature gas is rapidly cooled (to about 250°C), effectively preventing the regeneration of dioxin gas. The water-gas mixture enters the cooling device 60 for further cooling before being discharged.
[0026] The cooling device 60 in this embodiment includes a cooling tower 61, a spray device 62 located at the upper end of the cooling tower 61, an exhaust pipe 63 located at the upper end of the cooling tower 61, a filter located in the exhaust pipe 63, and a sedimentation tank 64 located at the lower end of the cooling tower 61. Specifically, after the high-temperature water-air mixture enters the cooling tower 61, cooling water is sprayed out through the spray device 62 to further cool the gas. The cooled gas is then discharged after passing through the filter in the exhaust pipe 63 (the filter is mainly made of activated carbon, etc.), and the remaining substances settle into the sedimentation tank 64 below the cooling tower 61.
[0027] The heat exchange device 70 in this embodiment includes a heat exchange tank 71 connected to the discharge device 30, and a blower 72 connected to the side wall of the heat exchange tank 71; the transmission device 80 includes a conveyor belt located at the lower end of the heat exchange tank 71; the blower 72 is connected to the upper side wall of the heat exchange tank 71, and the waste heat pipe 73 is connected to the lower side wall of the heat exchange tank 71. Specifically, high-temperature (approximately 600°C) solid material is discharged into the heat exchange tank 71, and the blower 72 sends outside air into the heat exchange tank 71 to cool the solid material. At the same time, the air is heated and discharged from the waste heat pipe 73. The high-temperature air discharged from the waste heat pipe 73 enters the feed tank 11 to preheat the material, and the cooled solid material is discharged from the lower end of the heat exchange tank 71 onto the conveyor belt for transport.
[0028] In summary, the dioxin catalytic cracking system of this embodiment feeds the fly ash desalination product into the feeding device 10, which then feeds the raw material into the rotary kiln 20 at a certain rate. The raw material is gradually heated in the rotary kiln 20, causing the harmful residual solid dioxins to become gaseous. The solid material and gaseous dioxins in the rotary kiln 20 then enter the discharge device 30, which sends the gaseous dioxins into the heating device 40 and the solid material into the heat exchange device 70. The dioxin gas entering the heating device 40 is further heated (above 850°C), causing the dioxin gas to crack. The cracked gas enters the jet device 50, mixes with room temperature water, is rapidly cooled, and then injected into a cooling system for rapid cooling and discharge. This effectively prevents the memory reformation of dioxins. The solid material entering the heat exchanger 70 has its heat transferred back to the feeding device 10, thus preheating the material. This system not only efficiently treats dioxins in fly ash desalination products but also effectively recycles the heat generated by the system, reducing overall energy consumption.
[0029] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A dioxin catalytic cracking system, characterized in that: It includes a feeding device (10), a rotary kiln (20), a discharging device (30), a heating device (40), a jetting device (50), and a cooling device (60) arranged in sequence; the air outlet of the discharging device (30) is connected to the heating device (40); It also includes a heat exchange device (70) connected to the discharge end of the discharge device (30), a transmission device (80) connected to the discharge end of the heat exchange device (70), and a waste heat pipe (73) connected to the air outlet end of the heat exchange device (70); the waste heat pipe (73) is connected to the feeding device (10).
2. The dioxin catalytic cracking system according to claim 1, characterized in that: The feeding device (10) includes a feeding tank (11), a first feeder (12) located at the upper end of the feeding tank (11), a second feeder (13) located at the lower end of the feeding tank (11), and an exhaust pipe (14) located at the upper end of the feeding tank (11). The second feeder (13) is connected to the feed inlet of the rotary kiln (20), and the exhaust pipe (14) is connected to a dust collector.
3. The dioxin catalytic cracking system according to claim 1, characterized in that: The rotary kiln (20) includes a horizontally arranged furnace body (21), a plurality of electromagnetic heaters (22) disposed on the furnace body (21), a plurality of temperature detection devices (23) disposed on the furnace body (21), a waste heat branch pipe (24) disposed at the feed end of the furnace body (21), and a regulating valve (25) disposed on the waste heat branch pipe (24); The waste heat branch pipe (24) is connected to the waste heat pipe (73).
4. The dioxin catalytic cracking system according to claim 3, characterized in that: The discharge device (30) includes a vertically arranged discharge tank (31); the discharge tank (31) is connected to the discharge end of the furnace body (21); the lower end of the discharge tank (31) is connected to the heat exchange device (70), and the upper end of the discharge tank (31) is connected to the heating device (40).
5. The dioxin catalytic cracking system according to claim 1, characterized in that: The heating device (40) includes a heating tank (41), a heating tube (42) disposed in the heating tank (41), and a heating device (40) for heating the heating tube (42); one end of the heating tube (42) is connected to the discharge device (30), and the other end is connected to the jet device (50).
6. The dioxin catalytic cracking system according to claim 5, characterized in that: The jetting device (50) includes a jetting nozzle (51), a high-pressure water pipe (52) located at the inlet end of the jetting nozzle (51), a water pump connected to the high-pressure water pipe (52), and a mixing pipe (53) located at the outlet end of the jetting nozzle (51). The heating tube (42) is connected to the side wall of the inlet end of the jet injector (51), and the end of the mixing tube (53) away from the jet injector (51) is located in the cooling device (60).
7. The dioxin catalytic cracking system according to claim 6, characterized in that: The cooling device (60) includes a cooling tower (61), a spray device (62) located at the upper end of the cooling tower (61), an exhaust pipe (63) located at the upper end of the cooling tower (61), a filter located in the exhaust pipe (63), and a sedimentation tank (64) located at the lower end of the cooling tower (61).
8. The dioxin catalytic cracking system according to claim 1, characterized in that: The heat exchange device (70) includes a heat exchange tank (71) connected to the discharge device (30) and a blower (72) connected to the side wall of the heat exchange tank (71); the transmission device (80) includes a conveyor belt located at the lower end of the heat exchange tank (71); The blower (72) is connected to the upper side wall of the heat exchange tank (71), and the waste heat pipe (73) is connected to the lower side wall of the heat exchange tank (71).