Fly ash harmless and resourceful treatment system

Abstract

The utility model belongs to the technical field of solid waste treatment, and particularly relates to a fly ash harmless and resourceful treatment system. The harmless and recycling treatment system for the fly ash comprises a mixing and stirring unit, a fluidized bed drying and preheating unit, a dioxin catalytic cracking unit, a washing and desalting unit, an evaporative crystallization and salt production unit and a flue gas treatment unit, the mixing and stirring unit is used for stirring and mixing fly ash, a curing agent and a catalyst according to a set proportion; a gas outlet of the dioxin catalytic cracking unit is connected with a gas inlet of the fluidized bed preheating and drying unit, a gas outlet of the fluidized bed preheating and drying unit is connected with a gas inlet of the evaporative crystallization salt-making unit, and a gas outlet of the evaporative crystallization salt-making unit is connected with a gas inlet of the flue gas treatment unit. According to the utility model, the energy consumption is greatly reduced and the cost is saved while harmless and resourceful treatment of the fly ash is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to solid waste treatment technical field, especially relate to a fly ash harmless and resourceful disposal system. BACKGROUND

[0002] Fly ash refers to the tiny ash particle discharged in the dye combustion process, and the particle size is generally between 1-100 mu m. The main source of fly ash is domestic waste incineration, which is a secondary pollutant generated in the process of waste incineration, and its yield is about 0.5%-3% of the waste incineration amount. Fly ash contains toxic substances dioxin, which can penetrate into environmental media such as soil and atmosphere under certain conditions, thereby entering plants and animals, and finally enriching in the human body and threatening the physical and mental health of human beings, causing secondary pollution. In addition, fly ash obtained by incineration of domestic waste also contains a variety of heavy metals, which can accumulate through the food chain and also pose a serious threat to the environment and human health, so it is necessary to carry out harmless treatment on fly ash. In addition, fly ash contains components such as CaO, SiO2 and Fe2O3, which are similar to the raw materials for cement production, so it is often used as a substitute for raw materials for cement production or used to prepare concrete and aggregate, so it is also necessary to carry out resource utilization of fly ash.

[0003] The most common way to treat fly ash at present is solidification landfill, which solidifies heavy metals and dioxin in fly ash to reduce the risk of leaching, but it needs to consume a large amount of cement and also needs manpower supervision. Landfill is limited and the economic and added value of fly ash itself is not high, resulting in low resource utilization rate of fly ash.

[0004] In order to solve the above problems, the Chinese utility model patent application file with the application publication number CN116851421A discloses a continuous fly ash dioxin hydrothermal degradation and heavy metal solidification system and method, which comprises a slurry preparation device, a feeding device, a hydrothermal reaction device, a heating device, a discharging device and a slurry cooling device. Fly ash enters the slurry preparation device and is mixed with water to prepare fly ash slurry. The fly ash slurry is sent into the hydrothermal reaction device through the feeding device, the heating device provides heat for the hydrothermal reaction device, and the dioxin in the fly ash slurry is degraded through hydrothermal reaction. The fly ash slurry after hydrothermal reaction is sent into the slurry cooling device through the discharging device, and after cooling, it is subjected to the next resource utilization treatment, which includes one or more than two of fly ash washing, evaporation crystallization salt extraction, use as cement production raw material and use as brick and pottery raw material.

[0005] From the above disclosure, it can be known that the current way of removing dioxin in fly ash is by hydrothermal degradation, and the chlorine element in fly ash is converted into the form of chlorinated salt by evaporation crystallization, but hydrothermal degradation and evaporation crystallization need to provide heat respectively, which consumes more energy. UTILITY MODEL CONTENT

[0006] The utility model provides a fly ash harmless and resourceful disposal system, distinguish from the existing fly ash harmless and resourceful processing mode, has solved the technical problem of the existing fly ash harmless and resourceful processing mode's energy consumption is bigger.

[0007] In order to solve the above problem, the fly ash harmless and resourceful disposal system provided by the utility model adopts the following technical scheme:

[0008] The fly ash harmless and resourceful disposal system includes a mixing and stirring unit with a material inlet and a material outlet, a fluidized bed drying and preheating unit, a dioxin catalytic cracking unit, a water washing and desalination unit, an evaporation and crystallization salt making unit and a flue gas treatment unit; the fluidized bed preheating and drying unit, the dioxin catalytic cracking unit, the evaporation and crystallization salt making unit and the flue gas treatment unit also have an air inlet and an air outlet;

[0009] The material outlet of the mixing and stirring unit is connected with the material inlet of the fluidized bed drying and preheating unit, and the mixing and stirring unit is used for stirring and mixing fly ash, a solidifying agent and a catalyst in a set proportion; the material outlet of the fluidized bed preheating and drying unit is connected with the material inlet of the dioxin catalytic cracking unit; the material outlet of the dioxin catalytic cracking unit is connected with the material inlet of the water washing and desalination unit; the material outlet of the water washing and desalination unit is connected with the material inlet of the evaporation and crystallization salt making unit;

[0010] The air outlet of the dioxin catalytic cracking unit is connected with the air inlet of the fluidized bed preheating and drying unit, the air outlet of the fluidized bed preheating and drying unit is connected with the air inlet of the evaporation and crystallization salt making unit, and the air outlet of the evaporation and crystallization salt making unit is connected with the air inlet of the flue gas treatment unit.

[0011] Further, the mixing and stirring unit includes a fly ash temporary storage bin, a catalyst temporary storage bin, a solidifying agent temporary storage bin, three metering belt scales and a stirring and mixing machine, the metering belt scales are connected with the discharge outlets of the fly ash temporary storage bin, the catalyst temporary storage bin and the solidifying agent temporary storage bin respectively, and the ends of the three metering belt scales are connected with the feeding inlet of the stirring and mixing machine; the discharge outlet of the special stirring and mixing machine forms the material outlet of the mixing and stirring unit and is connected with the material inlet of the fluidized bed drying and preheating unit; the three metering belt scales synchronously feed the feeding inlet of the stirring and mixing machine.

[0012] Further, the stirring and mixing machine includes a material mixing barrel and two sets of reamers rotatably assembled in the material mixing barrel, the two sets of reamers rotate in opposite directions and have a speed difference.

[0013] Further, the dioxin catalytic cracking unit comprises a cracking furnace and a hot blast furnace, the gas outlet of the hot blast furnace is connected with the gas inlet of the cracking furnace, so that the cracking furnace is heated by the hot blast furnace; the fluidized bed preheating and drying unit comprises a fluidized bed with a gas inlet and a gas outlet and a first dust collector; the gas outlet of the cracking furnace forms the gas outlet of the dioxin catalytic cracking unit and is connected with the gas inlet of the fluidized bed; the gas outlet of the fluidized bed is connected with the gas inlet of the first dust collector, and the gas outlet of the first dust collector is connected with the gas inlet of the evaporative crystallization salt making unit.

[0014] Further, the evaporative crystallization salt making unit comprises an evaporator and sodium chloride storage tanks and potassium chloride storage tanks connected with the material outlet of the evaporator, and the gas inlet of the evaporator is connected with the gas inlet of the first dust collector.

[0015] Further, the flue gas treatment unit comprises a quenching tower, a second dust collector, an alkali washing spray tower, an activated carbon adsorption device and a chimney connected in sequence, the gas inlet of the quenching tower forms the gas inlet of the flue gas treatment unit and is connected with the gas outlet of the evaporator, and the exhaust port of the chimney forms the gas outlet of the flue gas treatment unit.

[0016] Further, the first dust collector and the second dust collector are bag dust collectors or cyclone dust collectors.

[0017] Further, the water washing desalination unit comprises multiple-stage water washing devices and a regulating tank connected in sequence, the water washing devices are used for washing the fly ash after removal of dioxin to obtain water washing liquid containing sodium chloride and potassium chloride; each stage of the water washing devices has a water washing liquid inlet, a water washing liquid outlet, a material inlet and a material outlet, the material inlet of the first stage of the water washing devices is connected with the material outlet of the dioxin catalytic cracking unit, and the material inlet of the first stage of the water washing devices is further connected with a first medicament adding device for adding an alkaline salt solution; in the adjacent two stages of the water washing devices, the material outlet of the upper stage of the water washing devices is connected with the material inlet of the lower stage of the water washing devices, and the water washing liquid outlet of the lower stage of the water washing devices is connected with the water washing liquid inlet of the upper stage of the water washing devices; the water washing liquid inlet of the last stage of the water washing devices is used for connecting a water supply source, and the material outlet of the last stage of the water washing devices is used for connecting a resource utilization device for resource utilization of wet ash; the water washing liquid outlet of the first stage of the water washing devices is connected with the regulating tank, and the regulating tank is connected with a second medicament adding device for adding a pH adjusting medicament to the regulating tank to adjust the pH value of the water washing liquid.

[0018] The fly ash harmless and resourceful disposal system has the following advantages:

[0019] 1. The utility model discloses a method different from the existing hydrothermal degradation to treat dioxins in fly ash, namely, fly ash, catalyst and solidifying agent are mixed by stirring to form a mixture, the mixture is preheated and dried, and then is introduced into a cracking furnace, under the catalysis of the catalyst, dioxins are cracked, and the chemical bond is broken, which needs less energy, the carcinogenic substance dioxins in the fly ash can be removed at a lower temperature and less energy consumption, realizing the harmless treatment of the fly ash, and after the dioxins are cracked and eliminated, subsequent hydrolysis, evaporation and crystallization and other processes are carried out, realizing the resource utilization.

[0020] 2. The utility model discloses a method different from the existing hydrothermal degradation to treat dioxins in fly ash, namely, fly ash, catalyst and solidifying agent are mixed by stirring to form a mixture, the mixture is preheated and dried, and then is introduced into a cracking furnace, under the catalysis of the catalyst, dioxins are cracked, and the chemical bond is broken, which needs less energy, the carcinogenic substance dioxins in the fly ash can be removed at a lower temperature and less energy consumption, realizing the harmless treatment of the fly ash, and after the dioxins are cracked and eliminated, subsequent hydrolysis, evaporation and crystallization and other processes are carried out, realizing the resource utilization.

[0021] 3. The utility model discloses a method different from the existing hydrothermal degradation to treat dioxins in fly ash, namely, fly ash, catalyst and solidifying agent are mixed by stirring to form a mixture, the mixture is preheated and dried, and then is introduced into a cracking furnace, under the catalysis of the catalyst, dioxins are cracked, and the chemical bond is broken, which needs less energy, the carcinogenic substance dioxins in the fly ash can be removed at a lower temperature and less energy consumption, realizing the harmless treatment of the fly ash, and after the dioxins are cracked and eliminated, subsequent hydrolysis, evaporation and crystallization and other processes are carried out, realizing the resource utilization. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which:

[0023] Figure 1 It is a connection process relationship schematic view between each unit in the fly ash harmless and resourceful disposal system of the utility model;

[0024] Figure 2 It is a detailed process flow chart of the fly ash harmless and resourceful disposal system of the utility model;

[0025] Figure 3 It is Figure 2 The structure connection schematic view between each equipment in the utility model.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 10. Mixing and stirring unit; 11. Fly ash temporary storage bin; 12. Catalyst temporary storage bin; 13. Curing agent temporary storage bin; 14. First metering belt scale; 15. Mixing mixer; 16. Second metering belt scale; 17. Third metering belt scale; 20. Fluidized bed drying and preheating unit; 21. Fluidized bed; 22. First dust collector; 23. Hot air furnace; 30. Dioxin catalytic cracking unit; 31. Cracking furnace; 40. Flue gas treatment unit; 41. Quenching tower; 42. Second dust collector; 43. Spray tower; 44. Activated carbon adsorption device; 45. Chimney; 50. Multi-stage countercurrent water washing and desalination unit; 51. First-stage water washing device; 52. Second-stage water washing device; 53. Third-stage water washing device; 54. Equalization tank; 60. Evaporation and crystallization salt production unit; 61. Evaporator; 62. Sodium chloride storage tank; 63. Potassium chloride storage tank. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0029] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0030] The embodiment of the fly ash harmless and resourceful disposal system provided by the utility model:

[0031] like Figure 1 As shown, the fly ash harmless and resource-based disposal system includes a mixing and stirring unit 10, a fluidized bed drying and preheating unit 20, a dioxin catalytic cracking unit 30, a flue gas treatment unit 40, a multi-stage countercurrent water washing and desalination unit 50 and an evaporation crystallization salt production unit 60.

[0032] The relationship between each unit is as follows Figure 1As shown, the material outlet of the mixing and stirring unit 10 is connected with the material inlet of the fluidized bed drying and preheating unit 20; the material outlet of the fluidized bed drying and preheating unit is connected with the material inlet of the dioxin catalytic cracking unit 30; the material outlet of the dioxin catalytic cracking unit 30 is connected with the material inlet of the multi-stage countercurrent water washing and desalting unit 50; the material outlet of the multi-stage countercurrent water washing and desalting unit 50 is connected with the material inlet of the evaporation and crystallization salt making unit 60. The fluidized bed drying and preheating unit, the dioxin catalytic cracking unit 30, the evaporation and crystallization salt making unit 60 and the flue gas treatment unit 40 are also provided with gas inlets and gas outlets, the gas outlet of the dioxin catalytic cracking unit 30 is connected with the gas inlet of the fluidized bed drying and preheating unit, the gas outlet of the fluidized bed drying and preheating unit is connected with the gas inlet of the evaporation and crystallization salt making unit 60, and the gas outlet of the evaporation and crystallization salt making unit 60 is connected with the gas inlet of the flue gas treatment unit.

[0033] Specifically, the mixing and stirring unit 10 is used for metering and weighing the fly ash, mixing and stirring, facilitating the subsequent solidification of heavy metals in the fly ash and the decomposition of dioxin. In the embodiment, as shown in Figure 2 and Figure 3 The mixing and stirring unit 10 includes a fly ash temporary storage bin 11, a catalyst temporary storage bin 12, a solidifying agent temporary storage bin 13, a first metering belt scale 14, a second metering belt scale 16, a third metering belt scale 17 and a mixing and stirring machine 15. The catalyst stored in the catalyst temporary storage bin 12 is an alkaline metal oxide such as calcium oxide, copper oxide and aluminum oxide; the first metering belt scale 14 is connected with the discharge port of the catalyst temporary storage bin 12 and is used for weighing and conveying the catalyst. The solidifying agent stored in the solidifying agent temporary storage bin 13 is cement, and of course, in other embodiments, the cement can be replaced by fly ash or other commercial solidifying agents; the second metering belt scale 16 is connected with the discharge port of the solidifying agent temporary storage bin 13 and is used for weighing and conveying the solidifying agent. The third metering belt scale 17 is connected with the discharge port of the fly ash temporary storage bin 11 and is used for weighing and conveying the fly ash. The first metering belt scale 14, the second metering belt scale 16 and the third metering belt scale 17 have the same structure, and the ends of the three are connected with the material inlet of the mixing and stirring machine 15 to synchronously feed the material inlet of the mixing and stirring machine 15. The catalyst entering the mixing and stirring machine 15 accounts for 3%-5% of the mass of the fly ash entering the mixing and stirring machine 15; the solidifying agent entering the mixing and stirring machine 15 accounts for 3%-5% of the mass of the fly ash entering the mixing and stirring machine 15.

[0034] The mixing and stirring machine 15 is a special equipment capable of fully and uniformly stirring the fly ash, the solidifying agent and the catalyst, including a material mixing barrel capable of rotating and two sets of reamers rotatably assembled in the material mixing barrel. The material mixing barrel rotates clockwise, the directions of rotation of the two sets of reamers are opposite, and the rotating speeds of the two sets of reamers are different. The discharge port of the material mixing barrel forms the material outlet of the entire mixing and stirring unit 10.

[0035] The fluidized bed drying preheating unit 20 is used to preliminarily preheat and dry the fly ash, so as to facilitate subsequent cracking and removal of dioxin. As shown in Figure 2 and Figure 3 The fluidized bed drying preheating unit 20 includes a fluidized bed 21 and a first dust collector 22, and the material inlet of the fluidized bed 21 is connected with the material outlet of the stirring mixer 15. The fluidized bed 21 and the first dust collector 22 both have gas inlets and gas outlets, and the gas outlet of the fluidized bed 21 is connected with the gas inlet of the first dust collector 22. In the embodiment, the first dust collector 22 is a cyclone dust collector commonly used in the prior art.

[0036] The dioxin catalytic cracking unit 30 is used to remove the harmful substance dioxin in the fly ash efficiently. In the embodiment, as shown in Figure 2 and Figure 3 The dioxin catalytic cracking unit 30 includes a cracking furnace 31 and a hot blast stove 23, and the gas outlet of the hot blast stove 23 is connected with the gas inlet of the cracking furnace 31. The hot blast stove 23 generates hot air which enters the cracking furnace 31 to heat the cracking furnace 31, so that the temperature of the cracking furnace 31 is increased to the required temperature for cracking. The pyrolysis temperature of the cracking furnace 31 is 400-600°C. The gas outlet of the cracking furnace 31 forms the gas outlet of the entire dioxin catalytic cracking unit 30, and the gas outlet of the cracking furnace 31 is connected with the gas inlet of the fluidized bed 21. The temperature of the flue gas at the flue gas inlet of the fluidized bed 21 is 200-400°C.

[0037] The multi-stage countercurrent water washing desalination unit 50 is used to wash the fly ash after removal of dioxin, so as to obtain a water washing liquid containing sodium chloride and potassium chloride. In the embodiment, as shown in Figure 2 and Figure 3 The multi-stage countercurrent water washing desalination unit 50 includes a first-stage water washing device 51, a second-stage water washing device 52, a third-stage water washing device 53 and an adjusting tank 54. Each water washing device has a water washing liquid inlet, a water washing liquid outlet, a material inlet and a material outlet, and each water washing device also has water and fly ash stirring and water and wet ash separation functions. These functions are known in the prior art, and thus will not be described in detail.

[0038] The material inlet of the first-stage water washing device 51 is connected with the material outlet of the dioxin catalytic cracking unit 30, and the material inlet of the first-stage water washing device 51 is also connected with a first medicament adding device for adding an alkaline salt solution, which can be sodium carbonate, sodium phosphate, sodium sulfate solution, etc. The material outlet of the first-stage water washing device 51 is connected with the material inlet of the second-stage water washing device 52, the material outlet of the second-stage water washing device 52 is connected with the material inlet of the third-stage water washing device 53, and the material outlet of the third-stage water washing device 53 is connected with a resource utilization device for resource utilization of the wet ash. The water washing liquid outlet of the first-stage water washing device 51 is connected with the adjusting tank 54, the water washing liquid inlet of the first-stage water washing device 51 is connected with the water washing liquid outlet of the second-stage water washing device 52, the water washing liquid inlet of the second-stage water washing device 52 is connected with the water washing liquid outlet of the third-stage water washing device 53, and the water washing liquid inlet of the third-stage water washing device 53 is connected with a water source for supplying water into the third-stage water washing device 53. During the water washing process of each stage, the water-ash ratio is adjusted in the range of 3:1 to 5:1.

[0039] The adjusting tank 54 is used for adjusting the pH value of the water washing liquid, and is connected with a second medicament adding device for adding a pH adjusting medicament into the adjusting tank 54 to adjust the pH value of the water washing liquid. The pH adjusting medicament uses an acidic substance such as hydrochloric acid, and finally adjusts the pH value of the water washing liquid to 7-9.

[0040] The evaporation crystallization salt making unit 60 utilizes the principle that the solubility of sodium chloride and potassium chloride is different, and is segmented to precipitate to obtain industrial sodium chloride and potassium chloride. As shown in Figure 2 and Figure 3 In the embodiment, the evaporation crystallization salt making unit 60 includes an evaporator 61, a sodium chloride storage tank 62 and a potassium chloride storage tank 63. The evaporator 61 adopts the MVR evaporator 61 in the prior art, the material inlet of the evaporator 61 is connected with the adjusting tank 54, and the material outlets are respectively connected with the sodium chloride storage tank 62 and the potassium chloride storage tank 63. The evaporator 61 utilizes the difference that the solubility of sodium chloride and potassium chloride changes with temperature, evaporates and crystallizes the water washing liquid separated by the filtering device to obtain sodium chloride crystalline salt, separates out the sodium chloride crystalline salt, and cools the mother liquor to obtain potassium chloride crystalline salt. The air inlet of the evaporator 61 is connected with the air outlet of the first dust remover 22, and the first dust remover 22 is used for removing the particulate impurities in the flue gas to avoid entering into the evaporator 61 to cause blockage and damage of the evaporator 61. In addition, the condensed water generated in the evaporation process of the evaporator 61 can also be reused to the multi-stage countercurrent water washing desalination unit 50 as clean water for repeated use in the water washing process.

[0041] The flue gas disposal unit 40 is used for treating the flue gas generated by the dioxin catalytic cracking unit 30 to meet the discharge standard. As shown in Figure 2 and Figure 3As shown, in the embodiment, the flue gas treatment unit comprises, in sequence, a quench tower 41, a second dust remover 42, an alkali washing spray tower 43, an activated carbon adsorption device 44 and a chimney 45. The gas inlet of the quench tower 41 forms the gas inlet of the flue gas treatment unit and is connected with the gas outlet of the evaporator 61. The second dust remover 42 is a bag filter or a cyclone dust collector, which can further purify the particles and other impurities in the flue gas discharged from the evaporator 61. The gas outlet of the chimney 45 forms the gas outlet of the flue gas treatment unit, and the flue gas temperature at the outlet of the chimney 45 is 120-150℃.

[0042] The present application makes full use of the surplus heat energy of the flue gas after the cracking stage, and uses the waste heat of the flue gas to further provide heat energy for the fluidized bed drying and preheating unit 20 and the evaporative crystallization salt making unit 60. On the one hand, the dried and preheated fly ash reduces the heat of the dioxin cracking unit, and on the other hand, an additional heat source is not used as the heating source of the evaporator 61, and a large amount of energy is saved.

[0043] The above is only a preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fly ash detoxification and resource recovery system, characterized by, The device comprises a mixing and stirring unit with a material inlet and a material outlet, a fluidized bed drying and preheating unit, a dioxin catalytic cracking unit, a water washing and desalting unit, an evaporation and crystallization salt making unit and a flue gas treatment unit; the fluidized bed drying and preheating unit, the dioxin catalytic cracking unit, the evaporation and crystallization salt making unit and the flue gas treatment unit are also provided with an air inlet and an air outlet; The material outlet of the mixing and stirring unit is connected with the material inlet of the fluidized bed drying and preheating unit, and the mixing and stirring unit is used for stirring and mixing fly ash, solidifying agent and catalyst in a set proportion; the material outlet of the fluidized bed drying and preheating unit is connected with the material inlet of the dioxin catalytic cracking unit; the material outlet of the dioxin catalytic cracking unit is connected with the material inlet of the water washing and desalting unit; the material outlet of the water washing and desalting unit is connected with the material inlet of the evaporation and crystallization salt making unit; The air outlet of the dioxin catalytic cracking unit is connected with the air inlet of the fluidized bed drying and preheating unit, the air outlet of the fluidized bed drying and preheating unit is connected with the air inlet of the evaporation and crystallization salt making unit, and the air outlet of the evaporation and crystallization salt making unit is connected with the air inlet of the flue gas treatment unit.

2. The fly ash neutralization and resource recovery system of claim 1, wherein, The mixing and stirring unit comprises a fly ash temporary storage bin, a catalyst temporary storage bin, a solidifying agent temporary storage bin, three metering belt scales and a stirring and mixing machine; the three metering belt scales are respectively connected with the discharge outlets of the fly ash temporary storage bin, the catalyst temporary storage bin and the solidifying agent temporary storage bin; the ends of the three metering belt scales are connected with the feeding inlet of the stirring and mixing machine; the discharge outlet of the stirring and mixing machine forms the material outlet of the mixing and stirring unit and is connected with the material inlet of the fluidized bed drying and preheating unit; The three metering belt scales synchronously feed the feeding inlet of the stirring and mixing machine.

3. The fly ash neutralization and resource recovery system of claim 2, wherein, The stirring and mixing machine comprises a material mixing barrel and two sets of reamers rotatably arranged in the material mixing barrel; the two sets of reamers rotate in opposite directions and have a speed difference.

4. The fly ash detoxification and resource recovery system according to any one of claims 1-3, wherein, The dioxin catalytic cracking unit comprises a cracking furnace and a hot air furnace; the air outlet of the hot air furnace is connected with the air inlet of the cracking furnace so as to heat the cracking furnace by the hot air furnace; the fluidized bed drying and preheating unit comprises a fluidized bed and a first dust collector with an air inlet and an air outlet; the air outlet of the cracking furnace forms the air outlet of the dioxin catalytic cracking unit and is connected with the air inlet of the fluidized bed; the air outlet of the fluidized bed is connected with the air inlet of the first dust collector; the air outlet of the first dust collector is connected with the air inlet of the evaporation and crystallization salt making unit.

5. The fly ash neutralization and resource recovery system of claim 4, wherein, The evaporation and crystallization salt making unit comprises an evaporator and sodium chloride storage tanks and potassium chloride storage tanks connected with the material outlet of the evaporator; the air inlet of the first dust collector is connected with the air inlet of the evaporator.

6. The fly ash neutralization and resource recovery system of claim 5, wherein, The flue gas treatment unit comprises a quenching tower, a second dust collector, an alkali washing spray tower, an activated carbon adsorption device and a chimney connected in sequence; the air inlet of the quenching tower forms the air inlet of the flue gas treatment unit and is connected with the air outlet of the evaporator; the exhaust outlet of the chimney forms the air outlet of the flue gas treatment unit.

7. The fly ash neutralization and resource recovery system of claim 6, wherein, The first dust collector and the second dust collector are bag dust collectors or cyclone dust collectors.

8. The fly ash detoxification and resource recovery system according to any one of claims 1-3, wherein, The water washing desalination unit comprises multiple-stage water washing devices and adjusting tanks connected in sequence, the water washing devices are used for washing the fly ash after dioxin catalytic cracking to obtain water washing liquid containing sodium chloride and potassium chloride; each stage of the water washing devices has a water washing liquid inlet, a water washing liquid outlet, a material inlet and a material outlet, the material inlet of the first stage of the water washing devices is connected with the material outlet of the dioxin catalytic cracking unit, and the material inlet of the first stage of the water washing devices is further connected with a first medicament adding device for adding alkaline salt solution; in the two adjacent stages of the water washing devices, the material outlet of the upper stage of the water washing devices is connected with the material inlet of the lower stage of the water washing devices, and the water washing liquid outlet of the lower stage of the water washing devices is connected with the water washing liquid inlet of the upper stage of the water washing devices; the water washing liquid inlet of the last stage of the water washing devices is used for connecting a water supply source, and the material outlet of the last stage of the water washing devices is used for connecting a resource utilization device for resource utilization of the wet fly ash; The water washing liquid outlet of the first stage of the water washing devices is connected with the adjusting tank, and the adjusting tank is connected with a second medicament adding device for adding pH adjusting medicament to the adjusting tank to adjust the pH value of the water washing liquid.

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