Fly ash low-temperature thermal decomposition harmless treatment system

Abstract

The utility model discloses a harmless treatment system for fly ash low-temperature thermal decomposition. The harmless treatment system comprises an automatic feeding device, a paddle dryer, a first spiral conveyor, a low-temperature thermal decomposition furnace and a discharging and cooling device. The discharging end of the automatic feeding device is connected with the paddle dryer, the discharging end of the paddle dryer is connected with the first screw conveyor, the discharging end of the first screw conveyor is connected with the low-temperature thermal decomposition furnace, and the discharging end of the low-temperature thermal decomposition furnace is connected with the discharging cooling device. A ton bag is further detachably arranged at the discharging end of the discharging and cooling device. According to the method, pre-crushing and drying are carried out at the same time, and then low-temperature catalytic cracking is carried out; by adopting an advanced process and equipment, effective substances such as dioxin are effectively decomposed while heavy metals in a fly ash material are solidified, so that the effects of low energy consumption and innocent treatment on fly ash are achieved, the next resource utilization is facilitated, land resources are not occupied, and the economic benefit is increased. And therefore, the effects of saving more energy and being more efficient on the fly ash are achieved.

Description

Technical Field

[0001] This application relates to the technical field of fly ash treatment, and particularly to a system for harmless treatment of fly ash by low-temperature thermal decomposition. Background Art

[0002] Currently, the common methods for fly ash treatment in related technologies are mainly solidification and landfill, high-temperature pyrolysis, etc. For the solidification and landfill method of fly ash treatment, heavy metal solidifying agents are mixed with fly ash to solidify the heavy metals in the fly ash and reduce environmental pollution, and then it is transported to the landfill site for landfill. This process requires a large amount of land and takes a long time to remove dioxin pollution, which is likely to cause secondary pollution and is not suitable for resource utilization.

[0003] [[ID=,11]]For the high-temperature pyrolysis method of fly ash treatment, the toxic organic substances in the fly ash are decomposed and the heavy metals are solidified by the silicon dioxide lattice under high-temperature conditions. However, this process has extremely high energy consumption requirements and high requirements for equipment, and it is not easy to be widely applied on a large scale.

[0004] Therefore, in view of the above-mentioned related technologies, there is an urgent need for a fly ash treatment system that does not occupy land, can quickly decompose harmful substances such as dioxin, and reduce energy consumption. Utility Model Content

[0005] The purpose of this application is to provide a system for harmless treatment of fly ash by low-temperature thermal decomposition to solve the problems in the related fly ash treatment methods, such as occupying land, taking a long time to decompose harmful substances such as dioxin, and having extremely high energy consumption requirements.

[0006] The system for harmless treatment of fly ash by low-temperature thermal decomposition provided by this application adopts the following technical solutions:

[0007] A system for harmless treatment of fly ash by low-temperature thermal decomposition includes an automatic feeding device, a paddle dryer, a first screw conveyor, a low-temperature thermal decomposition furnace, and a discharging and cooling device; the discharging end of the automatic feeding device is connected to the feeding end of the paddle dryer, the discharging end of the paddle dryer is connected to the feeding end of the first screw conveyor, the discharging end of the first screw conveyor is connected to the feeding end of the low-temperature thermal decomposition furnace, the discharging end of the low-temperature thermal decomposition furnace is connected to the feeding end of the discharging and cooling device, and a ton bag is detachably arranged at the discharging end of the discharging and cooling device.

[0008] Furthermore, the automatic feeding device includes a bearing platform, and a lifting structure is further arranged on one side of the bearing platform. An inlet bin is arranged on the bearing platform, a stirrer is arranged inside the inlet bin through a locking assembly, a driving assembly matched with the stirrer is arranged outside the inlet bin, a second screw conveyor is arranged at the bottom of the inlet bin, and the discharge end of the second screw conveyor is connected to the feed end of the paddle dryer.

[0009] Furthermore, the locking assembly includes locking seats symmetrically arranged on two inner side walls of the inlet bin. Locking holes are formed on the opposite sides of the two locking seats, and locking blocks are rotatably arranged in the two locking holes through bearings. Locking pieces are arranged between the two ends of the stirrer and the two locking blocks respectively.

[0010] Furthermore, the driving assembly includes a driving member arranged on the outer side wall of the inlet bin. A driving rod is arranged at the output end of the driving member, and one end of the driving rod is connected to one side of the locking block.

[0011] Furthermore, the discharging and cooling device includes a support frame. A star-shaped discharger connected to the discharge end of the low-temperature pyrolysis furnace is arranged on the support frame. A third screw conveyor connected to the discharge end of the star-shaped discharger is further arranged on the support frame. A cooling mechanism is arranged outside the third screw conveyor, and the bag mouth of the ton bag is detachably arranged at the discharge end of the third screw conveyor.

[0012] Furthermore, the cooling mechanism includes water-cooled jackets symmetrically arranged outside the third screw conveyor. Water-cooled conveying pipes are connected to the two water-cooled jackets, and one end of the water-cooled conveying pipe is connected to an external water-cooling supplier.

[0013] Furthermore, the gas outlet ends of the paddle dryer and the low-temperature pyrolysis furnace are simultaneously connected to a flue gas treatment device through a suction pipeline. The flue gas treatment device includes a bag filter, an induced draft fan, a water film spray tower, and an activated carbon adsorption box. The bag filter, the induced draft fan, the water film spray tower, and the activated carbon adsorption box are sequentially connected through a gas pipeline.

[0014] Furthermore, a circulation assembly is further arranged on one side of the water film spray tower. The circulation assembly includes a spray pump. The suction end of the spray pump is connected to a plate heat exchanger through a first suction pipeline. The liquid inlet end of the plate heat exchanger is connected to one side of the bottom of the water film spray tower through a second suction pipeline. The suction end of the spray pump is connected to a spray head structure inside the water film spray tower through a discharge pipeline.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows: First, the automatic feeding device automatically transports the ton bags of materials after the water washing process and pressure filtration to the bearing platform to achieve the effect of automatic feeding. Then, the operator breaks open these ton bags of materials, so that the materials in the ton bags fall into the feed bin under the influence of gravity, and are continuously stirred by the stirrer. Then, the second screw conveyor is used to transport the uniformly stirred materials into the paddle dryer for heating and drying. Then, the first screw conveyor is used to transport the dried materials into the low-temperature thermal decomposition furnace to decompose and treat harmful substances such as dioxins in the materials. Then, the discharging and cooling device discharges the decomposed materials and quickly cools them. Finally, the cooled materials are discharged into the ton bags for storage.

[0016] In this way, through the above-mentioned mutually cooperating structure, the fly ash materials after the water washing process and pressure filtration can be treated with low energy consumption and harmlessly. At the same time, the treated fly ash materials can be further utilized resourcefully, without occupying land resources, thus achieving a more energy-saving and efficient effect on the fly ash. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the fly ash low-temperature thermal decomposition and harmless treatment system according to an embodiment of the present application.

[0018] Figure 2 is a schematic structural diagram of the driving component, the locking seat and the locking block according to an embodiment of the present application.

[0019] Figure 3 is a schematic structural diagram of the locking component according to an embodiment of the present application.

[0020] DESCRIPTION OF THE REFERENCE NUMERALS:

[0021] 1. Feed bin; 11. Stirrer; 12. Locking seat; 13. Locking block; 14. Locking bolt; 15. Locking nut; 16. Driving motor; 17. Driving rod; 2. Second screw conveyor; 3. Paddle dryer; 4. First screw conveyor; 5. Low-temperature thermal decomposition furnace; 6. Star-shaped discharger; 61. Third screw conveyor; 62. Water-cooled jacket; 63. Water-cooled conveying pipe; 7. Bag filter; 8. Induced draft fan; 9. Water film spray tower; 91. Spray pump; 92. Plate heat exchanger; 10. Activated carbon adsorption. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following is a further detailed description of the present application in conjunction with the Figures 1-3 drawings.

[0023] An embodiment of the present application discloses a fly ash low-temperature thermal decomposition and harmless treatment system. Refer to Figure 1, in this embodiment, the processing system includes an automatic feeding device, a paddle dryer 3, a first screw conveyor 4, a low-temperature pyrolysis furnace 5, a discharging and cooling device, and a ton bag. Among them, the discharging end of the automatic feeding device is connected to the feeding end of the paddle dryer 3. Through the automatic feeding device, the material ton bags can be automatically fed. Then, the operator opens these material ton bags, so that the automatic feeding device can stir and convey the materials into the paddle dryer 3, and the paddle dryer 3 heats and dries these materials, thereby realizing the evaporation of moisture in the materials.

[0024] Specifically, the material ton bags for realizing automatic feeding by the above-mentioned automatic feeding device are processed as follows before being loaded into the ton bags: that is, the existing fly ash is washed and filtered by pressing after passing through a water washing process, and the material obtained after removing the soluble salts in the fly ash is then loaded into the ton bags, thereby obtaining the above-mentioned material ton bags.

[0025] Specifically, referring to Figure 1 , in this embodiment, the automatic feeding device includes a bearing platform, a lifting structure, a feeding bin 1, a stirrer 11, a locking assembly, a driving assembly, and a second screw conveyor 2. Among them, the bearing platform is placed on one side of the paddle dryer 3; the lifting structure is installed on one side of the bearing platform, and the lifting structure is a device with automatic lifting and conveying functions such as a scraper conveyor or a belt conveyor, so as to lift and convey the material ton bags from the ground to the top of the bearing platform.

[0026] At the same time, the feeding bin 1 is installed on the top of the bearing platform; the stirrer 11 is installed inside the feeding bin 1 through the locking assembly. Through the setting of the locking assembly, not only can the stirrer 11 be firmly locked inside the feeding bin 1, so as to continuously stir the materials evenly, making the materials tumble to avoid blocking the feeding port of the feeding bin 1; but also the stirrer 11 can be disassembled from the feeding bin 1, so as to repair, replace or clean the stirrer 11.

[0027] Specifically, referring to Figure 2 and Figure 3 , in this embodiment, the locking assembly includes a locking seat 12, a locking block 13, and a locking member. Among them, there are two locking seats 12, and the two locking seats 12 are symmetrically and fixedly installed on both sides inside the feeding bin 1; there are two locking blocks 13, and locking holes are opened on the side of the two locking seats 12 corresponding to each other. The two locking blocks 13 are respectively rotatably installed on the hole walls of the two locking holes through bearings, and locking grooves are opened on the side of the two locking blocks 13 corresponding to each other. Both ends of the stirrer 11 are respectively installed in the locking grooves through locking members.

[0028] More specifically, the locking member includes a locking bolt 14 and a locking nut 15 threadedly connected to the locking bolt 14. A first through hole communicating with the locking notch is formed on one side of each of the two locking blocks 13, and the first through hole cooperates with the locking bolt 14; and second through holes cooperating with the locking bolt 14 are formed at both ends of the agitator 11.

[0029] When both ends of the agitator 11 are placed in the locking notch, the first through holes on the locking blocks 13 are aligned with the second through holes on the agitator 11. Then, the locking bolt 14 passes through the first through hole and the second through hole in sequence to penetrate the locking blocks 13 and the agitator 11. Finally, the locking nut 15 is screwed into the locking bolt 14, so that both ends of the agitator 11 can be stably installed on the two locking blocks 13.

[0030] Meanwhile, in this embodiment, the drive assembly is installed outside the feed bin 1, and the drive assembly cooperates with the agitator 11 to drive the agitator 11 to rotate. Specifically, the drive assembly includes a drive member and a drive rod 17. Among them, the drive member is a drive motor 16, and the drive motor 16 is installed outside the feed bin 1; one end of the drive rod 17 is installed on the output end of the drive motor 16, and the other end of the drive rod 17 rotatably penetrates the side wall of the feed bin 1 to extend into the locking hole and is fixedly connected to one side of one of the locking blocks 13 facing away from the locking notch.

[0031] When the drive motor 16 is started, the output end of the drive motor 16 drives the drive rod 17 to rotate, and the drive rod 17 drives the locking block 13 to rotate. When the locking block 13 rotates in the locking hole of the locking seat 12, it drives the agitator 11 to rotate, so as to continuously and evenly stir the material by the agitator 11.

[0032] Preferably, one side of the top of the feed bin 1 is also communicated with an external chemical dosing pump. When the agitator 11 evenly stirs the material, the heavy metal agent is added to the material through the chemical dosing pump. Through continuous stirring by the agitator 11, the material and the agent are fully mixed, so as to achieve the effect of solidifying heavy metals.

[0033] In addition, referring to Figure 1 , in this embodiment, the second screw conveyor 2 is installed at the bottom of the feed bin 1, and the feed end of the second screw conveyor 2 is communicated with the bottom of the feed bin 1. The discharge end of the second screw conveyor 2 is connected to the feed end of the paddle dryer 3 to realize orderly conveying of the stirred material into the paddle dryer 3 through the second screw conveyor 2, and then the paddle dryer 3 is used to heat and dry the material, so as to evaporate the moisture in the material.

[0034] Specifically, in this embodiment, the main components of the paddle dryer 3 are composed of an external jacket housing and an internal double - spiral blade structure. Among them, the double - shaft - type spirals arranged in parallel, the shaft centers and the blades are all hollow structures, and the lower housing is a jacket structure. The above - mentioned structures can introduce high - temperature steam as a heat source to heat the inner wall, the rotating shaft, and the blades, so that the material enters the inside of the paddle dryer 3, tumbles through the spiral structure and slowly moves forward, enabling the material to fully contact each heating surface, thereby efficiently evaporating the moisture in the material. More specifically, the inside of the paddle dryer 3 can be heated to a temperature of about 100 °C, which can reduce the moisture content of the material from 30 - 60% to less than 3 - 5%.

[0035] In addition, referring to Figure 1 , in this embodiment, the first screw conveyor 4 is arranged between the paddle dryer 3 and the low - temperature pyrolysis furnace 5. Specifically, the feeding end of the first screw conveyor 4 is connected to the discharging end of the paddle dryer 3, and the discharging end of the first screw conveyor 4 is connected to the feeding end of the low - temperature pyrolysis furnace 5. The setting of the first screw conveyor 4 can orderly convey the dried material into the inside of the low - temperature pyrolysis furnace 5, enabling the low - temperature pyrolysis furnace 5 to effectively decompose harmful substances such as dioxins in the dried materials.

[0036] More specifically, the main components of the low - temperature pyrolysis furnace 5 are a rotary cylinder and heating wires. Among them, the rotary cylinder is driven by a combination of a motor and a reducer and rotates slowly. Inside the rotary cylinder, inclined scrapers are welded, which can make the material be turned and slowly move forward during the rotation of the rotary cylinder.

[0037] At the same time, catalyst coatings are sprayed on both the inside of the rotary cylinder and the inclined scrapers. Under the action of temperature and catalyst, when contacting the dried material, it can catalytically decompose toxic components such as dioxins in the material. And the heating wires are installed directly below the rotary cylinder. The heating wires can heat the outer wall of the rotary cylinder. Under the uniform rotation of the rotary cylinder and the heat - preservation and sealing effect of the heating area, the overall heating of the rotary cylinder is uniform.

[0038] An adjustment control panel is also installed on the rotary cylinder. The adjustment control panel can heat the internal temperature to 300 - 450 °C, and the temperature sensor installed near the outer wall of the rotary cylinder can give timely feedback to ensure that the heating wires effectively control the constant temperature of the rotary cylinder. At the same time, its rotation speed can be adjusted, enabling the heating residence time of the material to be controlled within 25 - 60 minutes; its heating temperature can be adjusted, providing different heating environments.

[0039] Preferably, a gas injection port is also installed in the low-temperature thermal decomposition furnace 5. The gas injection port can change the interior of the rotary cylinder to facilitate filling with different gas atmospheres, and then decompose dioxins more effectively under a nitrogen gas atmosphere. In this way, under the action of various conditions, harmful substances such as dioxins in the material can be fully decomposed.

[0040] Secondly, referring to Figure 1 , in this embodiment, the discharging and cooling device is arranged on one side of the discharging end of the low-temperature thermal decomposition furnace 5, and the feeding end of the discharging and cooling device is connected to the discharging end of the low-temperature thermal decomposition furnace 5; the bag mouth of the ton bag is detachably installed at the discharging end of the discharging and cooling device. Through the setting of the discharging and cooling device, it is convenient to transport and cool the decomposed material in the low-temperature thermal decomposition furnace 5, and finally transport the cooled material into the ton bag for storage, so as to facilitate the next step of resource utilization of the material stored in the ton bag.

[0041] Specifically, in this embodiment, the discharging and cooling device includes a support frame, a star-shaped discharger 6, a third screw conveyor 61, and a cooling mechanism. Among them, the support frame is placed on one side of the discharging end of the low-temperature thermal decomposition furnace 5; the star-shaped discharger 6 is installed on the support frame, and the feeding end of the star-shaped discharger 6 is connected to the discharging end of the low-temperature thermal decomposition furnace 5. More specifically, the core structure of the star-shaped discharger 6 is a rotating plate structure, and the rotation of the plate can make the material fall evenly; at the same time, the rotating structure can always keep two plates in contact with the channel, playing a role in blocking the air flow before and after the channel.

[0042] At the same time, the third screw conveyor 61 is also installed on the support frame, and the feeding end of the third screw conveyor 61 is connected to the discharging end of the star-shaped discharger 6, and the discharging end of the third screw conveyor 61 is detachably installed with the ton bag; through the setting of the third screw conveyor 61, the material discharged from the star-shaped discharger 6 can be orderly transported into the ton bag for storage.

[0043] And the cooling mechanism is wrapped and installed on the outer side of the third screw conveyor 61 to cool the material conveyed inside the third screw conveyor 61; specifically, the cooling mechanism includes a water-cooled jacket 62, a water-cooled conveying pipe 63, and a water-cooled feeder. Among them, there are two water-cooled jackets 62, and the two water-cooled jackets 62 are symmetrically wrapped and installed on the outer side of the third screw conveyor 61, and the interiors of the two water-cooled jackets 62 are hollow; there are two water-cooled conveying pipes 63, one ends of the two water-cooled conveying pipes 63 are respectively connected to the two water-cooled jackets 62, and the other ends of the two water-cooled conveying pipes 63 are respectively connected to an external water-cooled feeder.

[0044] Under the action of the water-cooling supplier, cooling water is transported into the water-cooling jacket 62 along the water-cooling delivery pipe 63, thereby quickly cooling the material with a higher temperature, and then the cooled material is transported and stored in the ton bag through the third screw conveyor 61.

[0045] Specifically, the structures of the first screw conveyor 4, the second screw conveyor 2 and the third screw conveyor 61 described above are the same, and all include a shell, a shaft screw, a motor and a reducer, and play the role of conveying materials.

[0046] In addition, refer to Figure 1 In this embodiment, the air outlet end of the paddle dryer 3 and the air outlet end of the low-temperature thermal decomposition furnace 5 are connected to a flue gas treatment device through an exhaust pipeline. The flue gas treatment device can extract the flue gas inside the paddle dryer 3 and the flue gas inside the low-temperature thermal decomposition furnace 5 to uniformly and effectively treat the harmful substances in the flue gas.

[0047] Specifically, the flue gas treatment device includes a bag filter 7, an induced draft fan 8, a water film spray tower 9, and an activated carbon adsorption box 10. The bag filter 7, induced draft fan 8, water film spray tower 9, and activated carbon adsorption box 10 are placed on one side of the paddle dryer 3 and the low-temperature thermal decomposition furnace 5, respectively, and the bag filter 7, induced draft fan 8, water film spray tower 9, and activated carbon adsorption box 10 are interconnected via air pipelines. At the same time, the air inlet end of the bag filter 7 is interconnected with one end of the exhaust pipeline, and the end of the exhaust pipeline away from the bag filter 7 is interconnected with both the air outlet end of the paddle dryer 3 and the air outlet end of the low-temperature thermal decomposition furnace 5.

[0048] The induced draft fan 8 is driven by a variable frequency motor with adjustable wind speed, providing suction for the flue gas in the exhaust and delivery pipelines. When the induced draft fan 8 is started, the exhaust pipeline draws the flue gas from the paddle dryer 3 and the low-temperature thermal decomposition furnace 5. The flue gas is first transported along the exhaust pipeline to the bag filter 7, which removes large particles of dust from the flue gas. The flue gas then flows along the delivery pipeline into the water film spray tower 9 to cool the flue gas and remove soluble impurities. The flue gas then enters the activated carbon adsorption box 10 through the delivery pipeline to further adsorb and remove harmful substances in the flue gas. Finally, the treated flue gas is discharged.

[0049] Preferably, in this embodiment, a circulation component is further provided on one side of the water film spray tower 9. The circulation component includes a spray pump 91 located between the water film spray tower 9 and the activated carbon adsorption box 10. The suction end of the spray pump 91 is connected to a plate heat exchanger 92 through a first suction pipe. The liquid inlet end of the plate heat exchanger 92 is interconnected with the bottom side of the water film spray tower 9 through a second suction pipe. And the suction end of the spray pump 91 is connected to the spray head structure inside the water film spray tower 9 through a discharge pipe.

[0050] When the spray pump 91 is started, the spray water at the bottom of the water film spray tower 9 is extracted by using the second suction pipe, so that the spray water enters the plate heat exchanger 92 along the second suction pipe for heat exchange treatment. Then the spray water after heat exchange treatment is discharged into the discharge pipe along the first suction pipe. Finally, the spray water is transported by the discharge pipe into the spray head structure inside the water film spray tower 9 to spray the flue gas; in this way, by setting the circulation component, these spray waters can be recycled, thus achieving the effect of saving energy.

[0051] Therefore, the solution of this application uses pre-crushing and drying at the same time, and then low-temperature catalytic cracking; by adopting advanced processes and equipment, the heavy metals in the fly ash material are solidified while effectively decomposing harmful substances such as dioxins. The fly ash material is continuously and evenly stirred by the stirrer 11 in the feed bin 1, so that the material is mixed with the heavy metal solidifying agent, which can solidify the heavy metals and reduce pollution.

[0052] Then the material is transported into the paddle dryer 3 for drying treatment at about 100 °C. When the moisture content of the material is less than 5%, it can be transported into the low-temperature thermal decomposition furnace 5, which can heat the material to 300 - 450 °C. Under the combined action of the temperature and the catalyst coating inside the equipment, harmful substances such as dioxins in the material are decomposed. In this way, it can realize the low-energy consumption and harmless treatment of the fly ash material after the water washing process and pressure filtration; at the same time, the treated fly ash material can be used for the next step of resource utilization, without occupying land resources, thus achieving a more energy-saving and efficient effect on the fly ash.

[0053] The implementation principle of an embodiment of a fly ash low-temperature thermal decomposition and harmless treatment system in this application is as follows:

[0054] First, the material ton bags after the water washing process and pressure filtration are automatically transported to the loading platform through the automatic feeding device. Then the operator opens these material ton bags, so that the materials in the ton bags fall into the feed bin 1 under the influence of gravity and are continuously stirred by the stirrer 11; at the same time, the heavy metal medicament is added to the material through the dosing pump, and through continuous and even stirring, the material and the medicament are fully mixed to achieve the effect of solidifying heavy metals.

[0055] Then, the second screw conveyor 2 is used to convey the evenly stirred materials into the paddle dryer 3. The paddle dryer 3 can heat the materials to about 100 °C, enabling the moisture in the materials to evaporate and be discharged, so as to achieve heating and drying. After the dried materials are discharged from the discharge end of the paddle dryer 3, the first screw conveyor 4 is used to convey the dried materials into the low-temperature pyrolysis furnace 5.

[0056] The low-temperature pyrolysis furnace 5 rotates slowly, which can make the materials move forward slowly. After being heated by the heating wires at the bottom, the temperature in the furnace reaches 300 - 450 °C. The materials are heated at a constant temperature in the furnace. At the same time, the inside of the low-temperature pyrolysis furnace 5 is coated with a catalyst. Under the action of temperature and catalyst, harmful substances such as dioxins in the materials are fully decomposed. Then, the decomposed materials are discharged and quickly cooled through the discharging and cooling device. Finally, the cooled materials are discharged into the ton bags for storage.

[0057] Regarding the flue gas inside the paddle dryer 3 and the flue gas inside the low-temperature pyrolysis furnace 5, after starting the induced draft fan 8, the flue gas inside the paddle dryer 3 and the flue gas inside the low-temperature pyrolysis furnace 5 are extracted through the extraction pipeline. The flue gas is first conveyed along the extraction pipeline to the bag filter 7, and the bag filter 7 removes the large particulate dust in the flue gas. Then, the flue gas enters the water film spray tower 9 along the conveying pipeline to cool the flue gas and remove soluble impurities. The flue gas then enters the inside of the activated carbon adsorption box 10 through the conveying pipeline to further adsorb and remove harmful substances in the flue gas. Finally, the treated flue gas is discharged to the outside.

[0058] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. An innocuous treatment system for low-temperature thermal decomposition of fly ash, characterized in that: It includes an automatic feeding device, a paddle dryer (3), a first screw conveyor (4), a low-temperature pyrolysis furnace (5) and a discharging and cooling device; the discharging end of the automatic feeding device is connected to the feeding end of the paddle dryer (3), the discharging end of the paddle dryer (3) is connected to the feeding end of the first screw conveyor (4), the discharging end of the first screw conveyor (4) is connected to the feeding end of the low-temperature pyrolysis furnace (5), the discharging end of the low-temperature pyrolysis furnace (5) is connected to the feeding end of the discharging and cooling device, and a ton bag is detachably arranged at the discharging end of the discharging and cooling device.

2. The harmless treatment system for low-temperature thermal decomposition of fly ash according to claim 1, characterized in that: The automatic feeding device includes a bearing platform, a lifting structure is further arranged on one side of the bearing platform, a feeding bin (1) is arranged on the bearing platform, a stirrer (11) is arranged inside the feeding bin (1) through a locking assembly, a driving assembly matched with the stirrer (11) is arranged outside the feeding bin (1), a second screw conveyor (2) is arranged at the bottom of the feeding bin (1), and the discharging end of the second screw conveyor (2) is connected to the feeding end of the paddle dryer (3).

3. The harmless treatment system for low-temperature thermal decomposition of fly ash according to claim 2, characterized in that: The locking assembly includes locking seats (12) symmetrically arranged on two inner side walls of the feeding bin (1), locking holes are formed on the opposite sides of the two locking seats (12), locking blocks (13) are rotatably arranged in the two locking holes through bearings, and locking pieces are arranged between the two ends of the stirrer (11) and the two locking blocks (13) respectively.

4. The harmless treatment system for low-temperature thermal decomposition of fly ash according to claim 3, wherein: The driving assembly includes a driving member arranged on the outer side wall of the feeding bin (1), a driving rod (17) is arranged at the output end of the driving member, and one end of the driving rod (17) is connected to one side of the locking block (13).

5. The harmless treatment system for low-temperature thermal decomposition of fly ash according to claim 1, wherein: The discharging and cooling device includes a support frame, a star-shaped discharger (6) connected to the discharging end of the low-temperature pyrolysis furnace (5) is arranged on the support frame, a third screw conveyor (61) connected to the discharging end of the star-shaped discharger (6) is further arranged on the support frame, a cooling mechanism is arranged outside the third screw conveyor (61), and the bag mouth of the ton bag is detachably arranged at the discharging end of the third screw conveyor (61).

6. The harmless treatment system for low-temperature thermal decomposition of fly ash according to claim 5, characterized in that: The cooling mechanism includes water-cooled jackets (62) symmetrically arranged outside the third screw conveyor (61), water-cooled conveying pipes (63) are connected to the two water-cooled jackets (62), and one end of the water-cooled conveying pipe (63) is connected to an external water-cooling supplier.

7. A harmless treatment system for low-temperature thermal decomposition of fly ash according to claim 1, characterized in that: The gas outlet ends of the paddle dryer (3) and the low-temperature pyrolysis furnace (5) are simultaneously connected to a flue gas treatment device through a suction pipeline. The flue gas treatment device includes a bag filter (7), a draft fan (8), a water film spray tower (9) and an activated carbon adsorption box (10), and the bag filter (7), the draft fan (8), the water film spray tower (9) and the activated carbon adsorption box (10) are sequentially connected through a gas pipeline.

8. The harmless treatment system for low-temperature thermal decomposition of fly ash according to claim 7, wherein: A circulation component is further arranged on one side of the water film spray tower (9). The circulation component includes a spray pump (91). The suction end of the spray pump (91) is connected to a plate heat exchanger (92) through a first suction pipeline. The liquid inlet end of the plate heat exchanger (92) is connected to one side of the bottom of the water film spray tower (9) through a second suction pipeline. The suction end of the spray pump (91) is connected to the spray head structure inside the water film spray tower (9) through a discharge pipeline.

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