Low-chlorine environmental protection type waste incineration fly ash treatment system

Abstract

The utility model discloses a kind of low-chlorine environmental protection type refuse incineration fly ash processing systems, including incinerator, its lower end is equipped with first deslagging port, and upper end smoke outlet is connected high-temperature flue, waste heat heat exchange boiler, first half dry tower, first bag-type dust collector, fan and chimney in proper order;First half dry tower and the lower end of first bag-type dust collector are equipped with primary dust discharging port, and dust discharging port is connected first dust separation temporary storage tank;Temporary storage tank discharge port is connected water washing machine, dehydrator, first modulation tank, granulator, maintenance tank in proper order, and maintenance tank discharge port is connected back incinerator feed inlet;Domestic waste is combusted in incinerator, and flue gas is treated by each equipment and discharged up to standard;Fly ash is washed by water washing machine after entering temporary storage tank, and harmful substance such as chlorides is removed, then after dehydration, modulation, granulation, maintenance, re-enter incinerator secondary sintering;The utility model effectively removes harmful substance such as chlorides in fly ash, and solve the problem of containing chlorides after fly ash agglomerate sintering.

Description

TECHNICAL FIELD

[0001] The utility model relates to garbage incineration fly ash processing technical field, concretely relates to a kind of low-chlorine environmental protection type garbage incineration fly ash processing system. BACKGROUND

[0002] In the existing garbage incineration fly ash processing technology, such as the patent scheme with the publication number CN117091144A, a sintering treatment system of garbage incineration fly ash is disclosed, which mixes the fly ash made into granules with household garbage when returning to the incinerator, and uses the high-temperature environment of the incinerator for sintering treatment, greatly reduces the fly ash production, and effectively reduces the fly ash treatment and disposal cost.

[0003] However, in the processing process of this technical scheme, the fly ash granules still contain a certain amount of chloride salt after sintering. As a harmful substance, chloride salt not only affects the performance of fly ash granules as building materials, but also may cause secondary pollution to the environment during use.

[0004] The existence of chloride salt reduces the strength and durability of fly ash granules, affecting their quality as building materials. On the other hand, chloride salt may be released into the environment under certain conditions, causing pollution to soil, water, and other ecosystems, and thus endangering human health. Therefore, how to effectively remove chloride salt from fly ash has become a technical problem to be solved in the current garbage incineration fly ash processing field. UTILITY MODEL CONTENT

[0005] The utility model aims at the problems existing in the prior art, and provides a low-chlorine environmental protection type garbage incineration fly ash processing system, which effectively removes harmful substances such as chloride salt from fly ash, fundamentally solves the problem that fly ash granules still contain chloride salt after sintering in the prior art, and ensures that the sintered fly ash granules meet the harmless standard, which can be directly used as building materials, significantly improving the environmental protection and safety of fly ash processing.

[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0007] The utility model provides a kind of low-chlorine environmental protection type refuse incineration fly ash processing system, including incinerator, the lower end of the incinerator is equipped with first slagging port, the upper end smoke outlet of the incinerator is connected high-temperature flue, the smoke outlet of the high-temperature flue is connected waste heat exchange boiler, the smoke outlet of the waste heat exchange boiler is connected first half dry tower, the smoke outlet of the first half dry tower is connected first bag-type dust collector, the smoke outlet of the first bag-type dust collector is connected fan, and the fan is connected chimney;The lower end of the first half dry tower and the lower end of the first bag-type dust collector are equipped with a primary ash outlet, and the primary ash outlet is connected first ash storage tank;The discharge port of the first ash storage tank is connected water washing machine, for fly ash is washed;The discharge port of the water washing machine is connected dehydrator, for fly ash dehydration;The discharge port of the dehydrator is connected first modulation tank, for fly ash modulation;The discharge port of the first modulation tank is connected granulator, for fly ash pellet formation;The discharge port of the granulator is connected maintenance tank, for fly ash pellet maintenance;The discharge port of the maintenance tank is connected the feed inlet of incinerator, for secondary sintering.

[0008] Further, the water washing machine and the dehydrator are provided with liquid discharge ports, and the two liquid discharge ports are connected to a sedimentation tank; the liquid discharge port of the sedimentation tank is sequentially connected to an ultrafiltration device, a nanofiltration device and a reverse osmosis device.

[0009] Further, the primary ash outlet is connected to a fly ash conveying pipe, the fly ash conveying pipe is connected to a material distributor, one discharge port of the material distributor is connected to the first ash storage tank, and the other discharge port is connected to a second ash storage tank; the discharge port of the second ash storage tank is connected to a second modulation tank, the second modulation tank is provided with a feed inlet for adding mud cake precipitated in the sedimentation tank, and the discharge port of the second modulation tank is connected to an electric heating melting tank.

[0010] Further, the electric heating melting tank is provided with a waste gas discharge port, the waste gas discharge port is connected to a second half dry tower, the second half dry tower is connected to a second bag-type dust collector, the lower end of the second half dry tower and the lower end of the second bag-type dust collector are both provided with a secondary ash outlet, and the secondary ash outlet is connected to a secondary fly ash storage tank.

[0011] Further, the sedimentation tank is provided with a dosing port, the dosing port is connected to a dosing tank for adding flocculants and chelating agents to the sedimentation tank.

[0012] Further, the water washing machine adopts a spiral sand washer.

[0013] Further, the dehydrator adopts a plate-and-frame filter press.

[0014] Further, the discharge port of the maintenance tank is connected to the feed inlet of the incinerator through a spiral conveying device.

[0015] Furthermore, one drain port of the reverse osmosis device is used to discharge the clear liquid, and the other drain port is connected in sequence to the heat exchanger, evaporator, crystallizer, centrifuge and dryer.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] By introducing a water washing machine to wash fly ash, harmful substances such as chloride salts in fly ash can be effectively removed, fundamentally solving this problem and ensuring that the sintered fly ash granules meet the harmless standard and can be used directly as building materials, greatly improving the environmental protection and safety of fly ash treatment.

[0018] The waste liquid generated by the washing machine and the dewatering machine is treated in stages through sedimentation tank, ultrafiltration device, nanofiltration device and reverse osmosis device. The clear liquid obtained by reverse osmosis can be returned to fly ash slurry and water addition, realizing the recycling of water resources. The concentrated liquid can be used for evaporation and salt extraction, realizing the effective separation and recovery of salts such as sodium chloride / potassium chloride.

[0019] The sludge cake settled in the sedimentation tank contains harmful substances such as chloride salts and heavy metals. After being mixed with fly ash in the second ash storage tank, it is transported to an electric melting tank for high-temperature treatment. This effectively prevents the regeneration of dioxins under low-temperature conditions and completely decomposes the small amount of dioxins already generated in the fly ash and sludge cake, ensuring the environmental safety of the treated materials. The mixture is sintered at high temperature into a glassy slag. The glassy slag has good stability, and the harmful substances in it are solidified in the glassy structure, making it difficult to release into the environment. This avoids the pollution of soil, water and air by dioxins and other harmful substances, and achieves the harmless treatment of fly ash. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a device connection diagram of a fly ash treatment system according to an embodiment of this application;

[0022] Figure 2 This is a diagram showing the connection of the washing, concentration, and melting components in a fly ash treatment system according to one embodiment of this application.

[0023] Figure 3 This is a connection diagram of the evaporation and salt extraction apparatus in one embodiment of this application;

[0024] In the diagram: 1. Incinerator; 2. First ash discharge port; 3. High-temperature flue; 4. Waste heat exchange boiler; 5. First semi-dry tower; 6. First bag filter; 7. Fan; 8. Chimney; 9. First ash storage tank; 10. Washing machine; 11. Dewatering machine; 12. First conditioning tank; 13. Granulator; 14. Curing tank; 15. Sedimentation tank; 16. Ultrafiltration device; 17. Nanofiltration device; 18. Reverse osmosis device; 19. Ash conveying pipe; 20. Distributor; 21. Second ash storage tank; 22. Second conditioning tank; 23. Electric melting tank; 24. Second semi-dry tower; 25. Second bag filter; 26. Secondary fly ash storage tank; 27. Chemical dosing tank; 28. Heat exchanger; 29. ​​Evaporator; 30. Crystallizer; 31. Centrifuge; 32. Dryer. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Among the existing technologies for treating fly ash from waste incineration, such as the patent application with publication number CN117091144A, a sintering treatment system for fly ash from waste incineration is disclosed. The fly ash is made into granules and then returned to the incinerator to be fully mixed with municipal solid waste. The high-temperature environment of the incinerator is used for sintering treatment, which greatly reduces the amount of fly ash generated and effectively reduces the cost of fly ash treatment and disposal.

[0030] However, during the processing of this technology, the fly ash agglomerates still contain a certain amount of chloride salts after sintering. As a harmful substance, chloride salts not only affect the performance of fly ash agglomerates as building materials, but may also cause secondary pollution to the environment during use.

[0031] The presence of chloride salts reduces the strength and durability of fly ash particles, affecting their quality as building materials. Furthermore, under certain conditions, chloride salts may be released into the environment, polluting soil and water bodies, thereby harming ecosystems and human health. Therefore, effectively removing chloride salts from fly ash has become a pressing technical problem in the field of waste incineration fly ash treatment.

[0032] To address the above technical issues, such as Figure 1 and Figure 2 As shown in the figure, this application provides a low-chlorine environmentally friendly waste incineration fly ash treatment system, including an incinerator 1. The lower end of the incinerator 1 is provided with a first ash discharge port 2. The upper end of the incinerator 1 is connected to a high-temperature flue 3. The flue 3 is connected to a waste heat exchange boiler 4. The flue 4 is connected to a first semi-dry tower 5. The flue 5 is connected to a first bag filter 6. The flue 6 is connected to a fan 7. The fan 7 is connected to a chimney 8. The lower ends of the first semi-dry tower 5 and the first bag filter 6 are both provided with primary exhaust fans. The ash outlet is connected to the first ash storage tank 9; the outlet of the first ash storage tank 9 is connected to the washing machine 10 for washing fly ash; the outlet of the washing machine 10 is connected to the dewatering machine 11 for dewatering fly ash; the outlet of the dewatering machine 11 is connected to the first conditioning tank 12 for conditioning fly ash; the outlet of the first conditioning tank 12 is connected to the granulator 13 for forming fly ash granules; the outlet of the granulator 13 is connected to the curing tank 14 for curing fly ash granules; the outlet of the curing tank 14 is connected to the feed inlet of the incinerator 1 for secondary sintering.

[0033] Municipal solid waste is fully combusted in incinerator 1. The resulting flue gas, carrying a large amount of heat, rises and enters high-temperature flue duct 3 through the upper exhaust port. The flue gas in high-temperature flue duct 3 then enters waste heat exchange boiler 4. During this process, the heat in the flue gas is effectively absorbed and reused, achieving energy recovery. Subsequently, the cooled flue gas enters the first semi-dry tower 5, where chemical reactions remove most harmful substances such as dioxins, heavy metals, and sulfides. After preliminary purification, the flue gas enters the first bag filter 6, which efficiently filters fly ash from the flue gas, ensuring that the discharged flue gas meets harmless standards. Finally, it is discharged into the atmosphere through fan 7 and chimney 8, effectively reducing environmental pollution.

[0034] The reaction products settling at the bottom of the first semi-dry tower 5 and the fly ash filtered by the first bag filter 6 are temporarily stored in the first ash storage tank 9 through the primary ash discharge port. Subsequently, the fly ash is discharged from the first ash storage tank 9 into the washing machine 10 for washing to remove harmful substances such as chloride salts. The washed fly ash slurry is dewatered by the dewatering machine 11 and then enters the first conditioning tank 12, where a coagulant is added to agglomerate the fly ash, preparing it for the subsequent granulation process.

[0035] The prepared fly ash enters the granulator 13, where it is pressed into granules by roller extrusion. The formed fly ash granules are then transported to the curing tank 14, where they are kept under set temperature and humidity conditions for a period of time to stabilize the granule structure. The cured fly ash granules are then transported back to the incinerator 1 for secondary sintering.

[0036] This embodiment introduces a water washing machine 10 to wash the fly ash, which can efficiently remove harmful substances such as chloride salts from the fly ash. This fundamentally solves the problem that fly ash granules still contain chloride salts after sintering in the prior art, ensuring that the sintered fly ash granules meet the harmless standard and can be used directly as building materials, greatly improving the environmental protection and safety of fly ash treatment.

[0037] In some embodiments, both the washing machine 10 and the dewatering machine 11 are provided with drain ports, and both drain ports are connected to the sedimentation tank 15; the drain ports of the sedimentation tank 15 are sequentially connected to the ultrafiltration device 16, the nanofiltration device 17 and the reverse osmosis device 18.

[0038] After washing, the waste liquid contains soluble chloride salts, which need to be removed and recycled. After entering sedimentation tank 15, the impurities gradually settle to the bottom of the sedimentation tank 15 under gravity, achieving preliminary solid-liquid separation and reducing the suspended solids content in the waste liquid. The supernatant from sedimentation tank 15 enters ultrafiltration device 16 through the drain port. Ultrafiltration device 16 utilizes the sieving effect of the ultrafiltration membrane to effectively retain large molecules and other impurities in the waste liquid, while allowing water molecules and small molecules to pass through, achieving preliminary purification of the waste liquid. The ultrafiltration-treated liquid enters nanofiltration device 17. The nanofiltration membrane in nanofiltration device 17 has a specific pore size range, which can effectively retain divalent and polyvalent ions in the waste liquid, further reducing the salinity. The nanofiltration-treated liquid enters reverse osmosis device 18. Reverse osmosis device 18 utilizes the high-precision separation characteristics of the reverse osmosis membrane. Under pressure, it can almost retain all dissolved substances in the waste liquid, allowing only water molecules to pass through, thereby obtaining high-purity fresh water.

[0039] The waste liquid generated by the washing machine and dewatering machine is treated in stages through sedimentation tank, ultrafiltration device, nanofiltration device and reverse osmosis device. The clear liquid obtained from reverse osmosis can be returned to fly ash slurry and water addition, realizing the recycling of water resources. The concentrated liquid can be used for evaporation and salt extraction, realizing the effective separation and recovery of salts such as sodium chloride / potassium chloride.

[0040] In some embodiments, a primary ash discharge port is connected to an ash conveying pipe 19, which is connected to a distributor 20. One outlet of the distributor 20 is connected to a first ash storage tank 9, and the other outlet is connected to a second ash storage tank 21. The outlet of the second ash storage tank 21 is connected to a second conditioning tank 22. The second conditioning tank 22 is provided with an inlet for adding sludge cake that has settled in the sedimentation tank 15. The outlet of the second conditioning tank 22 is connected to an electric melting tank 23.

[0041] After being discharged from the primary ash discharge port, the fly ash enters the ash conveying pipe 19. Under the action of airflow or other conveying power, the fly ash is conveyed along the ash conveying pipe 19 to the distributor 20. The distributor 20 is equipped with a specific distribution structure, which can accurately distribute the incoming fly ash to different discharge ports according to a preset ratio or method.

[0042] The distributor 20 plays a crucial role in diverting fly ash. One of its outlets is connected to the first ash storage tank 9, through which a portion of the fly ash is temporarily stored. After undergoing washing, dehydration, conditioning, granulation, and curing processes, the fly ash re-enters the incinerator 1 for secondary sintering to further reduce the content of harmful substances and improve its stability. The other outlet of the distributor 20 is connected to the second ash storage tank 21, through which another portion of the fly ash is temporarily stored.

[0043] The sludge cake settled in sedimentation tank 15 contains harmful substances such as chloride salts and requires further treatment. The second ash storage tank 21 transports the temporarily stored fly ash to the electric melting tank 23. At the same time, the sludge cake in sedimentation tank 15 is also transported to the electric melting tank 23, where it is thoroughly mixed with the fly ash.

[0044] The temperature inside the electric melting tank 23 is set above 1000 degrees Celsius. Since the temperature between 300 and 400 degrees Celsius is the temperature at which dioxins are generated, controlling the temperature of the electric melting tank 23 to above 850 degrees Celsius can effectively prevent the regeneration of dioxins under low-temperature conditions and completely decompose the small amount of dioxins already generated in the fly ash and mud cake.

[0045] Finally, the mixture is sintered at high temperature into a glassy slag. The glassy slag has good stability, and the harmful substances in it are solidified in the glassy structure, making it difficult to release into the environment. This ensures the safety of the treated material for the environment and avoids the pollution of soil, water and air by harmful substances such as dioxins.

[0046] In some embodiments, the electric melting tank 23 is provided with a waste gas outlet, which is connected to a second semi-dry tower 24. The second semi-dry tower 24 is connected to a second bag filter 25. The lower end of the second semi-dry tower 24 and the lower end of the second bag filter 25 are both provided with secondary ash discharge ports, which are connected to a secondary fly ash storage tank 26.

[0047] During the high-temperature melting of fly ash and sludge mixture in the electrothermal melting tank 23, waste gas containing harmful substances is generated. This waste gas is transported through pipelines to the second semi-drying tower 24. The second semi-drying tower 24 removes most of the acidic and harmful gases from the waste gas, achieving preliminary purification. After preliminary purification in the second semi-drying tower 24, the waste gas enters the second bag filter 25 for further removal of solid particulate matter, achieving deep purification and ensuring that the discharged waste gas meets environmental emission standards.

[0048] During the waste gas purification reaction in the second semi-dry tower 24, reaction products settle to the bottom of the tower; the second bag filter 25 also traps a large amount of dust particles when filtering the waste gas. Both the lower ends of the second semi-dry tower 24 and the lower ends of the second bag filter 25 are equipped with secondary ash discharge ports. These reaction products and trapped dust particles are discharged through the secondary ash discharge ports and transported to the secondary fly ash storage tank 26 for temporary storage, so that they can be further processed or disposed of later.

[0049] In some embodiments, the sedimentation tank 15 is provided with a dosing port connected to a dosing tank 27 for adding flocculant and chelating agent to the sedimentation tank 15. The flocculant is used to precipitate impurity particles in the waste liquid, and the chelating agent is used to react with heavy metals to form precipitates.

[0050] In some embodiments, the washing machine 10 is a spiral sand washing machine.

[0051] When the washing machine 10 is working, the fly ash to be washed enters the tank through the feed inlet. Driven by the transmission device, the screw shaft begins to rotate, and the screw blades on the shaft propel the fly ash forward within the tank. Simultaneously, a certain amount of water is injected into the tank. Under the stirring and pushing action of the screw blades, the fly ash and water are thoroughly mixed, and soluble impurities such as chloride salts in the fly ash gradually dissolve in the water. As the screw shaft continues to rotate, the fly ash is continuously lifted and tumbled, further promoting the washing away of impurities. Finally, the thoroughly washed fly ash is discharged from the discharge outlet, while the washing liquid containing impurities is discharged from the drain outlet and enters the subsequent wastewater treatment stage.

[0052] In some embodiments, the dewatering machine 11 is a plate and frame filter press.

[0053] When the dewatering machine 11 is working, the washed fly ash slurry is fed into the filter chamber formed by the filter plates and filter frames. Under the action of the pressing device, the filter plates and filter frames are tightly pressed together to form multiple closed filter units. As the slurry is continuously injected, the pressure in the filter chamber gradually increases. Under the action of pressure, the water in the fly ash slurry passes through the filter cloth and is discharged, while the fly ash solids are trapped in the filter chamber and gradually form a filter cake. When the filter cake reaches a certain thickness, the feeding is stopped, the pressing device is released, and the filter cake is discharged from the filter frame, completing the dewatering process. The moisture content of the dewatered fly ash is greatly reduced, which facilitates the subsequent conditioning and granulation processes.

[0054] In some embodiments, the discharge port of the curing tank 14 is connected to the feed port of the incinerator 1 via a screw conveyor.

[0055] The fly ash granules that have completed curing in the curing tank 14 are discharged from the outlet under gravity and enter the screw conveyor. The screw conveyor uses the pushing action of the screw blades to transport the fly ash granules forward along the channel inside the shell. Finally, the fly ash granules are transported to the feed inlet of the incinerator 1 and enter the sintering furnace for sintering treatment.

[0056] like Figure 3 As shown, in some embodiments, one drain port of the reverse osmosis unit 18 is used to discharge the clear liquid, and the other drain port is connected in sequence to the heat exchanger 28, the evaporator 29, the crystallizer 30, the centrifuge 31 and the dryer 32.

[0057] The concentrate from the reverse osmosis unit 18 first enters the heat exchanger 28 for heat exchange to improve subsequent evaporation efficiency. It then enters the evaporator 29 for multi-effect evaporation, causing a large amount of water to evaporate and further increasing the solution concentration. Subsequently, the concentrate enters the crystallizer 30, where a crystallization reaction occurs, precipitating chloride and other salts in crystalline form. The precipitated crystals and mother liquor mixture enter the centrifuge 31, where centrifugation effectively separates the crystals from the mother liquor. Finally, the crystals enter the dryer 32 for drying, yielding a pure chloride product, thus achieving effective salt recovery.

[0058] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-chlorine environmentally friendly waste incineration fly ash treatment system, comprising an incinerator (1), wherein the lower end of the incinerator (1) is provided with a first ash discharge port (2), the upper end of the incinerator (1) is connected to a high-temperature flue (3), the flue of the high-temperature flue (3) is connected to a waste heat exchange boiler (4), the flue of the waste heat exchange boiler (4) is connected to a first semi-dry tower (5), the flue of the first semi-dry tower (5) is connected to a first bag filter (6), the flue of the first bag filter (6) is connected to a fan (7), and the fan (7) is connected to a chimney (8); both the lower end of the first semi-dry tower (5) and the lower end of the first bag filter (6) are provided with a primary ash discharge port, and the primary ash discharge port is connected to a first ash storage tank (9); Its features are, The discharge port of the first ash storage tank (9) is connected to a washing machine (10) for washing fly ash; the discharge port of the washing machine (10) is connected to a dewatering machine (11) for dewatering fly ash; the discharge port of the dewatering machine (11) is connected to a first conditioning tank (12) for conditioning fly ash; the discharge port of the first conditioning tank (12) is connected to a granulator (13) for forming fly ash granules; the discharge port of the granulator (13) is connected to a curing tank (14) for curing fly ash granules; the discharge port of the curing tank (14) is connected to the feed port of the incinerator (1) for secondary sintering.

2. The low-chlorine environmentally friendly waste incineration fly ash treatment system according to claim 1, characterized in that, Both the washing machine (10) and the dehydrator (11) are provided with drain ports, and both drain ports are connected to the sedimentation tank (15); the drain ports of the sedimentation tank (15) are connected in sequence to the ultrafiltration device (16), the nanofiltration device (17) and the reverse osmosis device (18).

3. The low-chlorine environmentally friendly waste incineration fly ash treatment system according to claim 2, characterized in that, The primary ash discharge port is connected to an ash conveying pipe (19), which is connected to a distributor (20). One outlet of the distributor (20) is connected to the first ash storage tank (9), and the other outlet is connected to the second ash storage tank (21). The outlet of the second ash storage tank (21) is connected to the second conditioning tank (22). The second conditioning tank (22) is provided with an inlet for adding the mud cake that has settled in the sedimentation tank (15). The outlet of the second conditioning tank (22) is connected to an electric melting tank (23).

4. The low-chlorine environmentally friendly waste incineration fly ash treatment system according to claim 3, characterized in that, The electric melting tank (23) is provided with a waste gas outlet, which is connected to the second semi-dry tower (24). The second semi-dry tower (24) is connected to the second bag filter (25). The lower end of the second semi-dry tower (24) and the lower end of the second bag filter (25) are both provided with secondary ash discharge ports, which are connected to the secondary fly ash storage tank (26).

5. The low-chlorine environmentally friendly waste incineration fly ash treatment system according to claim 2, characterized in that, The sedimentation tank (15) is equipped with a dosing port, which is connected to a dosing tank (27) for adding flocculants and chelating agents to the sedimentation tank (15).

6. The low-chlorine environmentally friendly waste incineration fly ash treatment system according to claim 1, characterized in that, The outlet of the curing tank (14) is connected to the inlet of the incinerator (1) via a screw conveyor.

7. The low-chlorine environmentally friendly waste incineration fly ash treatment system according to claim 2, characterized in that, One drain port of the reverse osmosis device (18) is used to discharge the clear liquid, and the other drain port is connected in sequence to the heat exchanger (28), evaporator (29), crystallizer (30), centrifuge (31) and dryer (32).

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