Continuous washing equipment and process for household garbage incineration fly ash
Through the combination of pulping mechanism, turntable extraction tower and solid-liquid separation mechanism, the intermittent feeding problem of fly ash water washing equipment is solved, and the continuous washing of fly ash is achieved, which improves the washing efficiency and reduces resource waste and environmental pollution.
Patent Information
- Application Number
- CN202510746973.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2025-08-12
AI Technical Summary
The existing fly ash water washing equipment has intermittent feeding methods in the multi-stage water washing process, resulting in low working efficiency and inability to achieve continuous operation.
The combination of a pulping mechanism, a turntable extraction tower, a first solid-liquid separation mechanism and a second solid-liquid separation mechanism is adopted to achieve continuous water washing of fly ash through countercurrent contact, and combine water resource recycling and evaporation and crystallization processes to improve the water washing efficiency and environmental protection.
The continuous operation of fly ash water washing is achieved, the water washing efficiency is improved, water resources is saved, production costs are reduced, and environmental pollution is reduced.
Smart Images
Figure CN120460449A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of fly ash washing, and in particular to a continuous water washing device and process for fly ash from domestic waste incineration. Background Art
[0002] Fly ash from the incineration of domestic waste is a hazardous waste produced during the treatment of waste incineration flue gas. It contains metal oxides such as CaO, MgO, SiO2, Fe2O3, as well as heavy metals such as Zn, Pb, Cu, Cr, Ni, Hg, and dioxins, and is toxic.
[0003] Currently, water washing is the most common method for treating fly ash from waste incineration. Existing water washing equipment primarily consists of a water washing unit, which includes a water washing kettle and a filter press, both of which are connected. The water washing unit operates as follows: fly ash is conveyed into the water washing kettle, where it is thoroughly mixed with water to dissolve the soluble salts in the fly ash. The resulting slurry is then passed into the filter press, which filters the slurry to separate the water from the fly ash, achieving water washing of the fly ash.
[0004] Since the effect of one-time water washing is limited, the existing fly ash treatment mostly adopts a multi-stage water washing process. In order to realize the multi-stage water washing process, the existing water washing equipment often adopts multiple water washing units in series. This means that when the water washing equipment washes the fly ash, the fly ash is sequentially connected to multiple water washing units to achieve multiple water washing of the fly ash, which can effectively remove the soluble salts in the fly ash.
[0005] Regarding the above-mentioned related technologies, in the multi-stage water washing process, after fly ash is fed into the water washing unit, it is necessary to wait for the water washing unit to complete the water washing work before continuing to feed the water washing unit. However, the water washing unit is in an inoperative state when feeding. This intermittent feeding method will seriously restrict the working efficiency of the water washing equipment. Summary of the Invention
[0006] The purpose of this application is to provide a continuous water washing device and process for fly ash from the incineration of domestic waste, the purpose of which is to enable the water washing device to work continuously and improve the working efficiency of the water washing device.
[0007] In the first aspect, the present application provides a continuous water washing device for domestic waste incineration fly ash, which adopts the following technical solutions: A continuous water washing device for fly ash from the incineration of domestic waste comprises a pulping mechanism, which is used to mix fly ash with pulping water to form fly ash slurry; a rotary disc extraction tower, which is vertically arranged, and the pulping mechanism is connected to the middle and upper part of the rotary disc extraction tower; the lower part of the rotary disc extraction tower is connected to a water inlet pipe; and a rotary disc extraction assembly is arranged in the rotary disc extraction tower; a first solid-liquid separation mechanism, which is connected to the lower end of the rotary disc extraction tower, and is used to perform solid-liquid separation on the precipitated material in the rotary disc extraction tower; and a second solid-liquid separation mechanism, which is connected to the upper end of the rotary disc extraction tower, and is used to perform solid-liquid separation on the extraction solution overflowing from the rotary disc extraction tower.
[0008] By adopting the above technical solution, with the cooperation of the pulping mechanism, the rotary disc extraction tower, the first solid-liquid separation mechanism and the second solid-liquid separation mechanism, the fly ash continuous water washing equipment can realize the fly ash water washing function.
[0009] The specific workflow is as follows: the slurrying mechanism mixes fly ash with water to form fly ash slurry, which then enters the rotary disc extraction tower. Washing water then flows upward within the tower, while the fly ash slurry settles downward within the tower. This allows the wash water and fly ash slurry to come into countercurrent contact within the tower. The rotary disc extraction tower allows the fly ash and wash water to fully contact and mix, allowing the wash water to extract soluble salts from the fly ash slurry, thereby improving the fly ash washing effect. Subsequently, the precipitated material at the lower end of the rotary disc extraction tower is transported to the first solid-liquid separation mechanism for solid-liquid separation, effectively separating the majority of the fly ash residue after washing. The extraction solution overflowing from the upper end of the rotary disc extraction tower is transported to the second solid-liquid separation mechanism for solid-liquid separation, which separates the fly ash particles from the extraction solution.
[0010] Based on the setting of the rotary disc extraction tower, the fly ash slurry in the rotary disc extraction table is in countercurrent contact with the washing water to realize the extraction function of the soluble salt in the fly ash, which can ensure the water washing effect of the fly ash slurry.
[0011] Moreover, since the rotary extraction tower has the characteristic of continuous operation, when the injection speed of the fly ash slurry in the rotary extraction tower is lower than the maximum fly ash washing efficiency of the rotary extraction tower, the fly ash slurry can be continuously injected into the rotary extraction tower, and the rotary extraction tower can continue to work, which can realize continuous water washing of the fly ash and thereby improve the fly ash washing efficiency.
[0012] Optionally, an evaporator is further included, the filtrate outlet of the second solid-liquid separation mechanism is connected to the evaporator, and the condensed water outlet of the evaporator is connected to the water inlet pipe.
[0013] By adopting the above technical solution, the filtrate of the second solid-liquid separation mechanism is introduced into the evaporator for treatment, and the condensed water generated by the evaporator is returned to the rotary disc extraction tower as washing water, thereby realizing the recycling of water resources, reducing the waste of water resources, and also reducing production costs.
[0014] Optionally, the filtrate outlet of the first solid-liquid separation mechanism is connected to the pulping mechanism.
[0015] By adopting the above technical solution, the filtrate separated by the first solid-liquid separation mechanism is returned to the pulping kettle to participate in the preparation of fly ash slurry, so that water resources are recycled, water resources are saved, and production costs are reduced; the pollution caused by the random discharge of the filtrate is avoided, and the environmental protection of the process is enhanced.
[0016] In the second aspect, the present application provides a continuous water washing process for fly ash from domestic waste incineration, which adopts the following technical solution: A continuous water washing process for fly ash from incineration of domestic waste adopts the above-mentioned continuous water washing equipment for fly ash from incineration of domestic waste, comprising the following steps: S1, passing fly ash and pulping water into the pulping mechanism to mix and form fly ash slurry; S2, injecting the fly ash slurry into the rotary disc extraction tower from the middle and upper part of the rotary disc extraction tower, and injecting washing water into the rotary disc extraction tower from the lower part of the rotary disc extraction tower; S3, conveying the sedimentation material settled in the lower part of the rotary disc extraction tower to the first solid-liquid separation mechanism, and the first solid-liquid separation mechanism performs solid-liquid separation on the sedimentation material; S4, conveying the extraction solution overflowing from the upper part of the rotary disc extraction tower to the second solid-liquid separation mechanism, and the second solid-liquid separation mechanism performs solid-liquid separation on the extraction solution.
[0017] By adopting this technical solution, fly ash is mixed with water using a slurrying mechanism to form a fly ash slurry. This fly ash slurry is then brought into countercurrent contact with wash water via a rotary disc extraction tower, effectively washing the fly ash. The first and second solid-liquid separation mechanisms, respectively, separate the precipitated material and the extraction solution, producing washed fly ash. The installation of the rotary disc extraction tower enables the entire washing process to proceed continuously, simplifying the process, improving operational convenience, and reducing labor intensity.
[0018] Optionally, after step S4, the method further includes the following steps: separating the water and soluble salts in the filtrate discharged from the second solid-liquid separation mechanism, and returning the separated water to the rotary disc extraction tower as the washing water in step S2.
[0019] By adopting the above technical solution, the water and soluble salts in the filtrate discharged from the second solid-liquid separation mechanism are separated, thereby extracting the soluble salts in the filtrate. The separated water is then returned to the rotary disc extraction tower as washing water, thus achieving water recycling and water resource recycling, reducing resource consumption and costs.
[0020] Optionally, the separation of water and soluble salts in the filtrate is carried out by evaporative crystallization.
[0021] By adopting the above technical solution, an evaporative crystallization process is used to separate the water and soluble salts in the filtrate. This allows the water in the filtrate to be separated as condensed water, which improves the purity of the separated water. Furthermore, because the condensed water carries heat energy, it maintains the temperature of the rotary disc extraction tower after reflux, enhancing the dispersion of fly ash particles and the efficiency of soluble salt dissolution, significantly improving the water washing effect.
[0022] Optionally, after step S3, the method further includes the following steps: returning the filtrate discharged from the first solid-liquid separation mechanism to the pulping mechanism as pulping water in step S1.
[0023] By adopting the above technical solution, the filtrate discharged from the first solid-liquid separation mechanism is recycled for utilization, which can realize the recycling of water resources, reduce the waste of water resources, and reduce production costs.
[0024] Optionally, in step S2, the following step is further included: adding flocculant into the rotary disc extraction tower.
[0025] By adopting the above technical solution, adding flocculant into the rotary disc extraction tower can enhance the sedimentation of fly ash slurry, facilitate the rapid sedimentation of fly ash slurry suspended in the rotary disc extraction tower, and thus ensure the solid-liquid separation effect of fly ash slurry and washing water in the rotary disc extraction tower.
[0026] Optionally, in step S1, when preparing the fly ash slurry, the mass ratio of fly ash to water is (1-2):1.
[0027] By adopting the above technical solution, the mass ratio of fly ash to water during the preparation of fly ash slurry is controlled at (1-2):1, which can better disperse the fly ash in water, ensure the uniformity and fluidity of the fly ash slurry, facilitate the subsequent water washing operation of the fly ash in the rotary disc extraction tower, and thus effectively improve the effect and efficiency of the fly ash washing.
[0028] Optionally, in step S2, the mass ratio of the fly ash slurry injected into the rotary disc extraction tower to water is (2-3):1.
[0029] By adopting the above technical solution, in the continuous water washing process for fly ash from municipal solid waste incineration, the mass ratio of fly ash slurry to water injected into the rotary disc extraction tower is set to (2-3):1. This can optimize the countercurrent contact effect between the fly ash slurry and the washing water in the rotary disc extraction tower, more fully wash the fly ash, effectively remove harmful substances in the fly ash, and at the same time rationally allocate resources, improve the water washing efficiency and effect, help achieve continuous and efficient operation of fly ash water washing, and facilitate the full process automation and closed operation of the entire process, simplify the process flow, reduce the difficulty of operation and labor intensity, reduce the equipment footprint, and save manpower and equipment investment.
[0030] In summary, this application includes at least one of the following beneficial technical effects: 1. This application is based on the characteristics of the rotary extraction tower. When the injection rate of the fly ash slurry in the rotary extraction tower is lower than the maximum fly ash washing efficiency of the rotary extraction tower, the fly ash slurry can be continuously injected into the rotary extraction tower, and the rotary extraction tower can continue to work, which can achieve continuous water washing of the fly ash and thereby improve the fly ash washing efficiency.
[0031] 2. The fly ash continuous water washing equipment of the present application realizes the recycling of water resources, which can save water resources and reduce production costs; at the same time, it avoids the pollution of the environment caused by the arbitrary discharge of water containing soluble salts, thereby enhancing the environmental friendliness of the process.
[0032] 3. The present application can effectively separate the fly ash after washing and reduce the residual fly ash in the water through the coordinated arrangement of the first solid-liquid separation mechanism and the second solid-liquid separation mechanism. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 It is a schematic diagram of the overall structure of the fly ash continuous water washing equipment of Example 1 of the present application.
[0034] Figure 2 It is a schematic diagram of the overall structure of the rotary disc extraction tower of Example 1 of the present application.
[0035] Figure 3 It is a schematic diagram of the cross-sectional structure of the rotary disc extraction tower of Example 1 of the present application.
[0036] Figure 4 It is a schematic diagram of the overall structure of the rotary disc extraction tower of Example 2 of the present application.
[0037] Figure 5 It is a schematic diagram of the cross-sectional structure of the rotary disc extraction tower of Example 2 of the present application.
[0038] Figure 6 yes Figure 5 Schematic diagram of the locally enlarged structure of part A.
[0039] Figure 7It is a schematic diagram of the overall structure of the intermediate shaft and the dynamic ring of Example 2 of the present application.
[0040] Figure 8 It is a schematic diagram of the overall structure of the turntable extraction tower, mounting base and vertical mounting frame of Example 3 of the present application.
[0041] Figure 9 It is a schematic diagram of the overall structure of the turntable extraction tower, mounting base and vertical mounting frame after the cross bar is disassembled and installed in Example 3 of the present application.
[0042] Figure 10 It is a schematic diagram of the overall structure of the heightened square ring frame of Example 3 of the present application.
[0043] In the figure, 1. pulping mechanism; 11. pulping kettle; 12. stirring assembly; 13. return pipe; 14. first conveying pipeline; 15. first pump; 2. rotary disc extraction tower; 21. water inlet pipe; 22. rotary disc extraction assembly; 221. rotating shaft; 2211. driving shaft; 2212. supporting shaft; 2213. intermediate shaft; 2214. slot; 2215. slot block; 222. rotating motor; 223. dynamic ring; 224. static ring; 23. reagent filling pipe; 24. tower top; 241. lifting ring; 25. tower bottom; 26. intermediate ring pipe; 27. supporting assembly; 271. supporting ring; 272. supporting rod; 28. descaling assembly; 281. descaling ring ;282. Descaling rod;3. First solid-liquid separation mechanism;31. Second conveying pipeline;32. Second pump;4. Second solid-liquid separation mechanism;41. Third conveying pipeline;42. Third pump;5. Temporary storage tank;6. First reflux mechanism;61. First reflux pipe;62. First reflux pump;7. Evaporator;8. Second reflux mechanism;81. Second reflux pipe;82. Second reflux pump;9. Mounting base;10. Vertical mounting frame;101. Raised square ring frame;1011. Vertical back frame;1012. Vertical side frame;1013. Mounting cross bar;102. Vertical slide rail;1021. Splicing slide rail;1022. Mounting slide;1023. Tightening bolts. DETAILED DESCRIPTION
[0044] The following is combined with Figure 1 -Attached Figure 10 , further details of this application are given.
[0045] Example 1: A continuous water washing device for fly ash from domestic waste incineration, referring to Figure 1 , including a pulping mechanism 1, a rotary disc extraction tower 2, a first solid-liquid separation mechanism 3 and a second solid-liquid separation mechanism 4.
[0046] Reference Figure 1The pulping mechanism 1 is connected to the upper and middle part of the rotary disc extraction tower 2, the lower part of the rotary disc extraction tower 2 is connected to the water inlet pipe 21, the first solid-liquid separation mechanism 3 is connected to the lower end of the rotary disc extraction tower 2, and the second solid-liquid separation mechanism 4 is connected to the upper end of the rotary disc extraction tower 2.
[0047] Reference Figure 1 During fly ash washing, the fly ash is formed into fly ash slurry in the slurry-making mechanism 1 and then transported to the rotary disc extraction tower 2 for washing. Mechanical agitation within the rotary disc extraction tower 2 breaks the wash water and fly ash slurry into small droplets, increasing the contact area between the wash water and the fly ash slurry. The soluble salts in the fly ash slurry dissolve more quickly in the wash water, improving the fly ash slurry's washing effect. After washing, the fly ash slurry settles to the bottom of the rotary disc extraction tower 2, forming a sediment. The wash water used to wash the fly ash slurry overflows to the top of the rotary disc extraction tower 2, forming an extraction solution. Therefore, the first solid-liquid separation mechanism 3 receives the sediment from the rotary disc extraction tower 2 for solid-liquid separation, separating the majority of the washed fly ash. Similarly, the second solid-liquid separation mechanism 4 receives the extraction solution from the rotary disc extraction tower 2 for solid-liquid separation, separating the small portion of fly ash particles in the extraction solution.
[0048] Reference Figure 1 The pulping mechanism 1 includes a pulping kettle 11, which is provided with a stirring assembly 12. The stirring assembly 12 includes a stirring shaft with stirring blades disposed on its sidewalls. The pulping kettle 11 is provided with a stirring motor, the driving shaft 2211 of which is coaxially connected to the stirring shaft. Furthermore, a feeding port is provided at the top end of the pulping kettle 11, and a return pipe 13 is connected to the top end of the pulping kettle 11.
[0049] Fly ash is introduced into the pulping kettle 11 through the feeding port, and then pulping water is introduced into the pulping kettle 11 through the return pipe 13. At this time, the stirring motor is driven, and the stirring shaft drives the stirring blades to rotate, mixing the fly ash and pulping water to form fly ash slurry.
[0050] Reference Figure 1 and Figure 2 A first delivery pipe 14 is provided between the pulping kettle 11 and the rotary disc extraction tower 2. One end of the first delivery pipe 14 is connected to the lower end of the pulping kettle 11, and the other end is connected to the upper middle portion of the rotary disc extraction tower 2. A first pump 15 is provided on the first delivery pipe 14. In this embodiment, the first pump 15 is a centrifugal pump.
[0051] Under the power of the first pump 15, the fly ash slurry produced by the slurry making kettle 11 is pumped into the rotary disc extraction tower 2, thus realizing the feeding of the fly ash slurry.
[0052] Reference Figure 1 and Figure 2The rotary disc extraction tower 2 is vertically arranged, and a heavy phase inlet and a light phase inlet are provided on the side wall of the rotary disc extraction tower 2. The heavy phase inlet is arranged above the light phase inlet. Specifically, the heavy phase inlet is located in the upper middle part of the rotary disc extraction tower 2, and the light phase inlet is located in the lower part of the rotary disc extraction tower 2.
[0053] Reference Figure 1 and Figure 2 The heavy phase inlet is connected to the first conveying pipe 14, and the light phase inlet is connected to the water inlet pipe 21. This allows the fly ash slurry to enter the rotary disc extraction tower 2 from the heavy phase inlet. Due to its high density, the fly ash slurry flows downward within the rotary disc extraction tower 2 under the action of gravity. The wash water enters the rotary disc extraction tower 2 from the light phase inlet. The wash water has a low density and gradually overflows the rotary disc extraction tower 2. This creates countercurrent contact between the fly ash slurry and the wash water within the rotary disc extraction tower 2.
[0054] Reference Figure 2 and Figure 3 The rotary disk extraction tower 2 has a built-in rotary disk extraction component 22, which includes a rotating shaft 221. The rotating shaft 221 is vertically arranged in the rotary disk extraction tower 2, and the rotating shaft 221 is coaxially arranged with the rotary disk extraction tower 2. A plurality of movable rings 223 are coaxially connected to the rotating shaft 221. The plurality of movable rings 223 are arranged in sequence along the axial direction of the rotating shaft 221. Both ends of the rotating shaft 221 are rotatably connected to the rotary disk extraction tower 2. A rotating motor 222 is provided on the rotary disk extraction tower 2, and the driving end of the rotating motor 222 is coaxially connected to the rotating shaft 221. The turntable extraction assembly 22 also includes a plurality of static rings 224, which are located in the turntable extraction tower 2. The static rings 224 are coaxially arranged with the turntable extraction tower 2, and the outer wall of the static ring 224 is fixedly connected to the inner wall of the turntable extraction tower 2. The plurality of static rings 224 are arranged in sequence along the vertical direction, and a clearance space is formed between two adjacent static rings 224. The clearance space is arranged in a one-to-one correspondence with the dynamic ring 223, and the dynamic ring 223 is located in the corresponding clearance space.
[0055] Reference Figure 1 and Figure 3 When the rotary disc extraction assembly 22 is operating, the rotating ring 223 rotates to achieve a mechanical stirring function. The mechanical stirring breaks up the fly ash slurry into small droplets, which can increase the contact area between the fly ash slurry and the washing water. The shear force generated by the rotation of the rotating ring 223 promotes mass transfer between the fly ash particles and the washing water, which causes the soluble salts in the fly ash slurry to migrate into the washing water. This allows the washing water to extract the soluble salts in the fly ash slurry, thereby achieving the function of washing the fly ash. In addition, during this process, after the washing water extracts the soluble salts in the fly ash slurry, the washing water continues to overflow upward to the top 24 of the rotary disc extraction tower 2; conversely, after the washing water extracts the soluble salts in the fly ash slurry, the fly ash slurry continues to settle downward to the bottom 25 of the rotary disc extraction tower 2, thereby achieving automatic separation of the two phases.
[0056] Reference Figure 1 and Figure 3 Moreover, since two adjacent static rings 224 are separated to form a clearance space, there is a dynamic ring 223 in each clearance space. This design allows an extraction chamber to be formed between two adjacent static rings 224. Therefore, under the action of multiple extraction chambers, the physical separation of the static rings 224 limits the reverse flow of fly ash slurry and cleaning water, reducing axial back mixing; at the same time, in each stage of the extraction chamber, the shear force generated by the high-speed rotation of the dynamic ring 223 strengthens the local mixing of the two phases, prompting the soluble salts in the fly ash slurry to be transferred step by step to the cleaning water, and ultimately achieving efficient step-by-step purification of the fly ash slurry.
[0057] Reference Figure 1 and Figure 3 Based on the structure of the rotary disc extraction tower 2, the countercurrent contact between the washing water and the fly ash slurry and the stirring of the rotary disc extraction component 22 greatly improve the fly ash washing efficiency, so that the soluble salts in the fly ash slurry can be more fully washed out, thereby improving the fly ash washing effect.
[0058] Reference Figure 3 In this embodiment, a plurality of static rings 224 are vertically located between the heavy phase inlet and the light phase inlet, which enables the rotary disc extraction assembly 22 to cover the entire countercurrent contact area, forming a multi-stage extraction process.
[0059] Reference Figure 1 and Figure 2 The side wall of the rotary disc extraction tower 2 is connected to a reagent filling pipe 23. Through the setting of the reagent filling pipe 23, a manual or automatic dosing device can add flocculant into the rotary disc extraction tower 2 to enhance the solid-liquid separation effect in the rotary disc extraction tower 2.
[0060] Reference Figure 1 A second delivery pipe 31 is provided between the first solid-liquid separation mechanism 3 and the rotary disc extraction tower 2. One end of the second delivery pipe 31 is connected to the lower end of the rotary disc extraction tower 2, and the other end is connected to the feed port of the first solid-liquid separation mechanism 3. A second pump 32 is provided on the second delivery pipe 31. In this embodiment, the second pump 32 is a screw pump.
[0061] Under the power of the second pump 32, the sedimentation material settled at the bottom of the rotary disc extraction tower 2 is pumped into the first solid-liquid separation mechanism 3, thus realizing the transportation of the sedimentation material.
[0062] In this embodiment, the first solid-liquid separation mechanism 3 is a centrifuge. Under the action of the first solid-liquid separation mechanism 3, the sedimentation material is separated into solid and liquid, which can separate the washed fly ash.
[0063] Reference Figure 1In this embodiment, the filtrate outlet of the first solid-liquid separation mechanism 3 is connected to a temporary storage tank 5. The temporary storage tank 5 is provided to store the filtrate separated by the first solid-liquid separation mechanism 3.
[0064] Reference Figure 1 In this embodiment, a first reflux mechanism 6 is further provided between the temporary storage tank 5 and the pulping kettle 11. The first reflux mechanism 6 includes a first reflux pipe 61. One end of the first reflux pipe 61 is connected to the temporary storage tank 5, and the other end is connected to the return pipe 13. The first reflux mechanism 6 is also provided with a first reflux pump 62. In this embodiment, the first reflux pump 62 is a magnetic pump.
[0065] Under the power of the first reflux pump 62, the filtrate in the temporary storage tank 5 flows through the first reflux pipe 61 and the return pipe 13 as pulping water in sequence, and finally flows back to the pulping kettle 11, which can realize water circulation and reduce water resource waste.
[0066] Reference Figure 1 The upper end of the rotary disc extraction tower 2 is connected to an overflow tank, so that as the fly ash washing process in the rotary disc extraction tower 2 continues, the extraction solution continuously overflows from the upper end of the rotary disc extraction tower 2 into the overflow tank.
[0067] Reference Figure 1 A third delivery pipe 41 is provided between the overflow tank and the second solid-liquid separation mechanism 4. One end of the third delivery pipe 41 is connected to the overflow tank, and the other end is connected to the second solid-liquid separation mechanism 4. In addition, a third pump 42 is provided on the third delivery pipe 41. In this embodiment, the third pump 42 is a pipeline pump; Under the action of the third pump 42, the extraction solution overflowing from the upper end of the rotary disc extraction tower 2 into the overflow tank is pumped into the second solid-liquid separation mechanism 4, thereby realizing the transportation of the extraction solution.
[0068] In this embodiment, the second solid-liquid separation mechanism 4 utilizes a filter press. The second solid-liquid separation mechanism 4 separates the fly ash particles remaining in the extraction solution. The coordination between the first solid-liquid separation mechanism 3 and the second solid-liquid separation mechanism 4 ensures that all washed fly ash is separated.
[0069] Reference Figure 1 The filtrate outlet of the second solid-liquid separation mechanism 4 is connected to an evaporator 7. In this embodiment, the evaporator 7 is an MVR evaporator 7 (full name: Mechanical Vapor Recompression). The second solid-liquid separation mechanism 4 discharges the filtrate into the evaporator 7, which performs an evaporation and crystallization process on the filtrate, thereby separating the water and soluble salts from the filtrate.
[0070] Reference Figure 1In this embodiment, a second reflux mechanism 8 is further provided between the evaporator 7 and the rotary disc extraction tower 2. The second reflux mechanism 8 includes a second reflux pipe 81. One end of the second reflux pipe 81 is connected to the condensed water outlet of the evaporator 7, and the other end is connected to the water inlet pipe 21. In addition, a second reflux pump 82 is provided on the second reflux pipe 81.
[0071] Under the action of the second reflux pump 82, the condensed water in the evaporator 7 flows through the second reflux pipe 81 and the water inlet pipe 21 in sequence as cleaning water, and finally enters the rotary disc extraction tower 2, which can realize water circulation and reduce water resource waste.
[0072] The operating principle of the present embodiment is as follows: during fly ash water washing, after the fly ash raw material enters the slurrying kettle 11 through the feed port, the return pipe 13 injects slurrying water into the slurrying kettle 11, and the agitator 12 forms a fly ash slurry. The fly ash slurry is transported to the rotary disc extraction tower 2 via the first delivery pipe 14. Simultaneously, wash water is transported to the rotary disc extraction tower 2 via the water inlet pipe 21. Within the rotary disc extraction tower 2, the denser fly ash slurry settles downward, while the wash water overflows upward, creating a continuous countercurrent mass flow environment between the fly ash slurry and the wash water.
[0073] The turntable extraction assembly 22 provided in the turntable extraction tower 2 works continuously, and the rotation of the moving ring 223 forms violent turbulence in the corresponding clearance space. The periodic shearing action of the moving ring 223 breaks the two-phase interface film, so that the soluble salts attached to the surface of the fly ash particles are quickly dissolved and released into the cleaning water, which enables the cleaning water to extract the soluble salts in the fly ash slurry, thereby realizing water washing of the fly ash.
[0074] After washing, the fly ash slurry sinks to the bottom of the rotary disc extraction tower 2, forming a precipitate. The wash water from the fly ash slurry extraction overflows to the top of the rotary disc extraction tower 2, forming an extraction solution. The precipitate is transported via a second conveying pipeline 31 to the first solid-liquid separation mechanism 3, which deeply dehydrates the precipitate to separate fly ash and filtrate. The separated filtrate is then returned to the pulping kettle 11 as pulping water for recycling. The extraction solution is transported via a third conveying pipeline 41 to the second solid-liquid separation mechanism 4, which separates the fly ash particles from the extraction solution. After separating the fly ash particles from the extraction solution, the second solid-liquid separation mechanism 4 transports the filtrate to an evaporator 7 for evaporation and crystallization purification, separating the water and soluble salts in the filtrate. The separated water forms condensed water, which is then returned to the rotary disc extraction tower 2 as wash water, forming a complete water circulation system.
[0075] This embodiment also discloses a continuous water washing process for fly ash from domestic waste incineration, comprising the following steps: S1, fly ash slurrying: fly ash and slurrying water are introduced into a slurrying mechanism 1 and mixed to form fly ash slurry.
[0076] Specifically, fly ash and slurrying water are introduced into slurrying mechanism 1 in equal proportions, and slurrying mechanism 1 mixes the fly ash and slurrying water to form fly ash slurry. When preparing the fly ash slurry, the mass ratio of fly ash to slurrying water is (1-2):1. Preferably, the mass ratio of fly ash to slurrying water is 1:1.
[0077] S2. Fly ash extraction: Inject fly ash slurry into the rotary disc extraction tower 2 from the middle and upper part of the rotary disc extraction tower 2, and inject washing water into the rotary disc extraction tower 2 from the lower part of the rotary disc extraction tower 2. The washing water extracts soluble salts in the fly ash slurry in the rotary disc extraction tower 2.
[0078] Specifically, the fly ash slurry prepared in step S1 is injected into the rotary disc extraction tower 2 from the heavy phase inlet of the rotary disc extraction tower 2; and the washing water is injected into the rotary disc extraction tower 2 from the light phase inlet of the rotary disc extraction tower 2.
[0079] Fly ash slurry flows downward within the rotary disc extraction tower 2, while wash water overflows upward within the rotary disc extraction tower 2, resulting in countercurrent contact between the wash water and the fly ash slurry within the rotary disc extraction tower 2. Under these conditions, the rotary disc extraction assembly 22 within the rotary disc extraction tower 2 operates, breaking up and dispersing the fly ash slurry into small droplets. This increases the contact area between the fly ash slurry and the wash water, causing soluble salts in the fly ash slurry to migrate into the wash water, allowing the wash water to extract the soluble salts from the fly ash slurry. After extracting the soluble salts from the fly ash slurry, the wash water continues to overflow upward to the top 24 of the rotary disc extraction tower 2. After being extracted by the wash water, the fly ash slurry continues to settle downward to the bottom 25 of the rotary disc extraction tower 2, thereby achieving automatic separation of the two phases.
[0080] The mass ratio of the fly ash slurry injected into the rotary disc extraction tower 2 to the washing water is (2-3): 1. Preferably, the mass ratio of the fly ash slurry injected into the rotary disc extraction tower 2 to the washing water is 2:1.
[0081] In addition, step S2 also includes the following steps: adding flocculant into the rotary disc extraction tower 2 .
[0082] Specifically, the automatic dosing device injects the flocculant into the chemical filling pipe 23, and then the chemical filling pipe 23 transports the flocculant to the rotary disc extraction tower 2. This can improve the solid-liquid separation effect of the fly ash slurry and the cleaning water in the rotary disc extraction tower 2, so that the cleaned fly ash slurry can settle to the bottom of the rotary disc extraction tower 2, preventing the fly ash slurry from being suspended in the rotary disc extraction tower 2.
[0083] S3, solid-liquid separation of the precipitated material: the precipitated material settled at the bottom of the rotary disc extraction tower 2 is transported to the first solid-liquid separation mechanism 3, and the first solid-liquid separation mechanism 3 performs solid-liquid separation on the precipitated material.
[0084] Specifically, after step S3, the following steps are also included: The water and soluble salts in the filtrate discharged from the first solid-liquid separation mechanism 3 are separated, and the separated water is refluxed into the rotary disc extraction tower 2 as the washing water in step S2.
[0085] In this embodiment, the soluble salts and water in the filtrate are separated by an evaporation crystallization process.
[0086] Specifically, the filtrate separated by the first solid-liquid separation mechanism 3 is transported to the evaporator 7, and the evaporator 7 performs evaporation and crystallization treatment on the filtrate to separate the soluble salts and water in the filtrate, wherein the water is separated in the form of condensed water, and the condensed water generated by the evaporator 7 is refluxed into the rotary disc extraction tower 2 as the washing water in step S2.
[0087] The temperature of the refluxed condensed water is not lower than 60° C., which ensures that the temperature in the rotary disc extraction tower 2 is not lower than 40° C. At such a temperature, the fly ash slurry is better dispersed in the washing water, which is conducive to enhancing the extraction effect of the washing water on the soluble salts in the fly ash slurry.
[0088] S4, solid-liquid separation of the extraction solution: the extraction solution overflowing from the upper part of the rotary disc extraction tower 2 is transported to the second solid-liquid separation mechanism 4, and the second solid-liquid separation mechanism 4 performs solid-liquid separation on the extraction solution.
[0089] Specifically, after step S4, the following steps are also included: The filtrate discharged from the second solid-liquid separation mechanism 4 is returned to the pulping kettle 11 as pulping water in step S1 .
[0090] The implementation principle of the embodiment of the present application is as follows: in the pulping stage, fly ash and pulping water are continuously mixed in the pulping kettle 11, and the stirring component 12 fully disperses the fly ash particles to form a homogeneous slurry.
[0091] During the extraction stage, the dynamic ring 223 rotates at high speed to break the fly ash slurry into small droplets, and the static ring 224 separates it to form a multi-stage extraction chamber, which gradually enhances the dissolution efficiency of soluble salts in the fly ash slurry; at the same time, the injected flocculant promotes the rapid sedimentation of the washed fly ash particles in the rotary disc extraction tower 2, and the washing water rich in soluble salts overflows upward to the top of the rotary disc extraction tower 2, and the two phases are self-balanced and separated in a continuous countercurrent.
[0092] After this, the precipitated material at the bottom of the rotary disc extraction tower 2 is subjected to solid-liquid separation to separate the washed fly ash. At the same time, the filtrate after solid-liquid separation is directly recycled into the pulping kettle 11, thus forming a pulping water closed loop. The extraction solution at the top of the rotary disc extraction tower 2 is subjected to solid-liquid separation to intercept the fly ash particles remaining in the extraction solution. The filtrate after solid-liquid separation is then subjected to evaporation and crystallization to separate the soluble salts and water in the filtrate. The separated water exists in the form of condensed water, and the condensed water is used as washing water and refluxed into the rotary disc extraction tower 2, thus forming a washing water closed loop.
[0093] Since the process uses a rotary disc extraction tower 2 to achieve fly ash washing, when the injection rate of the fly ash slurry is lower than the maximum fly ash washing efficiency of the rotary disc extraction tower 2, the fly ash slurry can be continuously injected into the rotary disc extraction tower 2, and the rotary disc extraction tower 2 can continue to work, which can achieve the continuity of fly ash washing and thereby improve the fly ash washing efficiency.
[0094] Example 2: A continuous water washing device for domestic waste incineration fly ash, referring to Figure 4 This embodiment differs from Example 1 in that the rotary disc extraction tower 2 includes a tower top 24, a tower bottom 25, and several intermediate ring tubes 26. The tower top 24 and the tower bottom 25 are spaced apart in the vertical direction, with the tower top 24 located above the tower bottom 25. The several intermediate ring tubes 26 are located between the tower top 24 and the tower bottom 25. The tower top 24, the intermediate ring tubes 26, and the tower bottom 25 are all coaxially arranged. The several intermediate ring tubes 26 are arranged sequentially along their own axis. The tower top 24 and adjacent intermediate ring tubes 26, between two adjacent intermediate ring tubes 26, and between the tower bottom 25 and adjacent intermediate ring tubes 26 are all detachable. In this embodiment, the tower top 24, the tower bottom 25, and the intermediate ring tubes 26 are all connected by flanges.
[0095] Based on the arrangement of the rotary disc extraction tower 2 , the height of the rotary disc extraction tower 2 can be adjusted by increasing or decreasing the number of the intermediate ring tubes 26 , thereby changing the water washing efficiency of the rotary disc extraction tower 2 on the fly ash.
[0096] Reference Figure 1 and Figure 4 In this embodiment, the heavy phase inlet is provided on the side wall of the tower top 24, and the overflow tank is connected to the side wall of the tower top 24. The light phase inlet is provided at the tower bottom 25, and the second delivery pipeline 31 is connected to the bottom of the tower bottom 25. An expansion inlet is provided on the side wall of the intermediate ring pipe 26, and the reagent injection pipe 23 is connected to the corresponding expansion inlet. The intermediate ring pipe 26 is also provided with a closing plate, which is detachably connected to the intermediate ring pipe 26 and closes the corresponding expansion inlet. The opening of the expansion inlet on the intermediate ring pipe 26 enables the rotary disc extraction tower 2 to expand the introduction of other reagents or fluids.
[0097] Reference Figure 4 and Figure 5The rotating shaft 221 includes a drive shaft 2211, a support shaft 2212, and several intermediate shafts 2213. The drive shaft 2211 is coaxially disposed within the tower top 24 and is rotatably connected to the tower top 24. The rotating motor 222 is disposed on the tower top 24, and the driving end of the rotating motor 222 is coaxially connected to the drive shaft 2211. The support shaft 2212 is coaxially disposed within the tower bottom 25 and is rotatably connected to the tower bottom 25. The intermediate shafts 2213 are disposed in a one-to-one correspondence with the intermediate annular tubes 26 and are coaxially disposed within the corresponding intermediate annular tubes 26. The drive shaft 2211 and adjacent intermediate shafts 2213, between two adjacent intermediate shafts 2213, and between the support shafts 2212 and adjacent intermediate shafts 2213 are all coaxially and detachably connected.
[0098] Reference Figure 5 and Figure 6 The dynamic rings 223 are arranged in a one-to-one correspondence with the intermediate shafts 2213 and are coaxially mounted on the corresponding intermediate shafts 2213. The static rings 224 are arranged in a one-to-one correspondence with the intermediate ring tubes 26 and are coaxially mounted within the corresponding intermediate ring tubes 26. The outer walls of the static rings 224 are fixedly connected to the inner walls of the corresponding intermediate ring tubes 26, and the static rings 224 are spaced apart and positioned above the corresponding dynamic rings 223. Furthermore, static rings 224 are also disposed within the tower base 25. The corresponding static rings 224 are located within the tower base 25, and the outer walls of the corresponding static rings 224 are fixedly connected to the inner walls of the tower base 25.
[0099] Reference Figure 5 and Figure 6 Based on the structural arrangement of the rotating shaft 221, each intermediate ring tube 26 is provided with an intermediate shaft 2213, a rotating ring 223, and a stationary ring 224. This means that increasing the number of intermediate ring tubes 26 is equivalent to increasing the number of rotating rings 223 and stationary rings 224, thereby increasing or decreasing the fly ash washing efficiency of the rotary disc extraction tower 2. Therefore, the present application allows for the free selection of the number of intermediate ring tubes 26 to meet actual usage requirements, and further allows for the free adjustment of the number of intermediate ring tubes 26 to adjust the fly ash washing efficiency of the rotary disc extraction tower 2, thereby greatly increasing the degree of flexibility in the use of the rotary disc extraction tower 2.
[0100] Reference Figure 6 and Figure 7 The lower end surface of the intermediate shaft 2213 defines a slot 2214. The slot 2214 extends along the radial direction of the intermediate shaft 2213 and extends through the intermediate shaft 2213 along its length. A block 2215 is located at the upper end of the intermediate shaft 2213. The block 2215 extends along the length of the slot 2214. The block 2215 on one intermediate shaft 2213 engages with the slot 2214 on the adjacent intermediate shaft 2213.
[0101] Reference Figure 5and Figure 7 In this embodiment, the lower end of the drive shaft 2211 also has a slot 2214 formed therein. The slot 2214 on the drive shaft 2211 engages with a block 2215 on the adjacent intermediate shaft 2213. Similarly, the upper end of the support shaft 2212 also has a block 2215 formed therein. The block 2215 on the support shaft 2212 engages with the slot 2214 on the adjacent intermediate shaft 2213.
[0102] Reference Figure 7 The cooperation between the straight groove 2214 and the straight block 2215 facilitates the quick connection between the intermediate shaft 2213 and the adjacent intermediate shaft 2213 or the support shaft 2212 or the drive shaft 2211, which facilitates the installation of the intermediate ring tube 26.
[0103] Reference Figure 6 A support assembly 27 is provided in the middle ring tube 26 , and the support assembly 27 is located below the corresponding dynamic ring 223 in the vertical direction.
[0104] Reference Figure 6 The support assembly 27 includes a support ring 271, which is coaxially mounted on the outside of the corresponding intermediate shaft 2213 and is rotatably connected to the intermediate shaft 2213. Several support shafts 2212 are mounted on the sidewall of the support ring 271. One end of each support shaft 2212 is fixedly connected to the support ring 271, and the other end is detachably connected to the inner wall of the intermediate ring tube 26. The function of the support assembly 27 ensures that the intermediate shaft 2213 can be stably installed in the corresponding intermediate tube.
[0105] Reference Figure 6 A descaling assembly 28 is also provided in the middle ring tube 26 , and the descaling assembly 28 is located above the corresponding moving ring 223 in the vertical direction.
[0106] Reference Figure 6 The descaling assembly 28 includes a descaling ring 281, which is coaxially sleeved around the outer side of the corresponding intermediate shaft 2213 and rotatably connected to the intermediate shaft 2213. Several descaling rods 282 are mounted on the sidewall of the descaling ring 281. One end of the descaling rod 282 is fixedly connected to the descaling ring 281, and the other end is detachably connected to the inner sidewall of the intermediate ring tube 26. The lower side of the descaling rod 282 contacts the upper surface of the corresponding movable ring 223, and the descaling rod 282 slides along the upper surface of the corresponding movable ring 223.
[0107] In this embodiment, the support shaft 2212 and the descaling rod 282 are both connected to the inner wall of the corresponding intermediate ring tube 26 by bolts.
[0108] Reference Figure 6The descaling assembly 28 is set, when the dynamic ring 223 rotates, the descaling rod 282 contacts the dynamic ring 223, thereby scraping off the dirt on the dynamic ring 223 and preventing scaling on the dynamic ring 223.
[0109] The implementation principle of the embodiment of the present application is as follows: the fly ash water washing efficiency requirement that the rotary disc extraction tower 2 needs to meet is determined based on actual requirements, and the number of intermediate loops 26 required for the rotary disc extraction tower 2 is calculated based on the fly ash water washing efficiency requirement, and then the rotary disc extraction tower 2 is assembled. This ensures that the fly ash water washing efficiency of the rotary disc extraction tower 2 meets the actual requirements.
[0110] When the requirements for fly ash washing efficiency increase, the number of intermediate ring tubes 26 required to be installed in the rotary disc extraction tower 2 is calculated according to the new fly ash washing efficiency requirements, and then the top 24 of the rotary disc extraction tower 2 is removed, and the corresponding number of intermediate ring tubes 26 are reinstalled, and finally the top 24 is reinstalled. This ensures that the rotary disc extraction tower 2 can be freely assembled to meet different fly ash washing efficiency requirements.
[0111] Example 3: A continuous water washing device for domestic waste incineration fly ash, referring to Figure 8 The difference between this embodiment and embodiment 2 is that: The device further includes a mounting base 9, on which a vertical mounting frame 10 is mounted. The vertical mounting frame 10 includes a plurality of elevated square ring frames 101. The plurality of elevated square ring frames 101 are detachably connected in sequence along the vertical direction, with the lowest elevated square ring frame 101 being detachably connected to the mounting base 9. In this embodiment, two adjacent elevated square ring frames 101 are connected by bolts.
[0112] The structural arrangement of the vertical mounting frame 10 facilitates the addition or subtraction of the number of height-increasing square ring frames 101 to adjust the height of the vertical mounting frame 10 .
[0113] Reference Figure 9 and Figure 10 In this embodiment, the heightened square ring frame 101 includes a vertical back frame 1011, two vertical side frames 1012, and a plurality of mounting cross bars 1013. The two vertical side frames 1012 are arranged in parallel and spaced apart, and the vertical back frame 1011 and the mounting cross bars 1013 are both located between the two vertical side frames 1012. The vertical back frame 1011 and the mounting cross bars 1013 are arranged in parallel and spaced apart, and the spacing direction between the vertical back frame 1011 and the mounting cross bars 1013 is arranged perpendicular to the spacing direction between the two vertical side frames 1012. The opposite sides of the vertical back frame 1011 are fixedly connected to the corresponding vertical side frames 1012 respectively. The length direction of the mounting cross bars 1013 is arranged along the spacing direction between the two vertical side frames 1012, and the ends of the mounting cross bars 1013 are detachably connected to the corresponding vertical side frames 1012.
[0114] In this embodiment, the upper and lower sides of the vertical back frame 1011 are detachably connected to the corresponding vertical back frame 1011 in the corresponding adjacent height-enhancing square ring frame 101. Similarly, the upper and lower sides of the vertical side frames 1012 are detachably connected to the corresponding vertical side frames 1012 in the corresponding adjacent height-enhancing square ring frame 101.
[0115] Based on the structural setting of the elevated square ring frame 101 , when the installation crossbar 1013 is removed, the elevated square ring frame 101 is opened, which facilitates the disassembly and assembly of the internal equipment or structure of the elevated square ring frame 101 .
[0116] Reference Figure 9 and Figure 10 A plurality of vertical slide rails 102 are arranged in the vertical mounting frame 10. The vertical slide rails 102 include a plurality of splicing slide rails 1021. The splicing slide rails 1021 are arranged one-to-one corresponding to the heightened square ring frame 101. The splicing slide rails 1021 are vertically installed on the corresponding vertical side frame 1012, and the plurality of splicing slide rails 1021 are spliced in sequence along the vertical direction.
[0117] Reference Figure 9 and Figure 10 The splicing rail 1021 is provided with a plurality of mounting slides 1022, which are slidably connected to the splicing rail 1021 along the vertical direction. In addition, the splicing rail 1021 is provided with a plurality of fastening bolts 1023, which are arranged one-to-one with the mounting slides 1022. The fastening bolts 1023 are screwed to the splicing rail 1021, and the fastening bolts 1023 are screwed to the corresponding mounting slides 1022.
[0118] Under the action of the fastening bolts 1023 , the position of the corresponding mounting slide 1022 can be locked to prevent the mounting slide 1022 from sliding on the corresponding splicing rail 1021 .
[0119] Reference Figure 8 and Figure 9 The rotary disc extraction tower 2 is located within the vertical mounting frame 10, with the tower base 25 connected to the mounting base 9. The tower top 24 and the intermediate annular tube 26 are both located within corresponding elevated square annular frames 101. Both the tower top 24 and the intermediate annular tube 26 are detachably connected to corresponding mounting slides 1022. Furthermore, the tower top 24 is provided with several lifting rings 241. In this embodiment, the tower top 24 and the intermediate annular tube 26 are connected to the corresponding mounting slides 1022 via bolts.
[0120] Since the turntable extraction tower 2 is arranged in the vertical mounting frame 10, and the turntable extraction tower 2 can adjust its own height by increasing or decreasing the number of intermediate ring tubes 26, the vertical mounting frame 10 can adjust its own height by increasing the number of heightening square ring frames 101, which makes the vertical mounting frame 10 adaptable to the turntable extraction tower 2.
[0121] On this basis, since the intermediate ring tube 26 and the tower top 24 in the turntable extraction tower 2 are both detachably connected to the corresponding mounting slide 1022, when the fastening bolt 1023 is separated from the corresponding mounting slide 1022, the corresponding intermediate ring tube 26 or tower top 24 can slide in the vertical direction in the vertical mounting frame 10.
[0122] The implementation principle of the embodiment of the present application is: when the intermediate ring tube 26 needs to be disassembled, replaced or added, starting from the position where the intermediate ring tube 26 needs to be disassembled, replaced or added, all the fastening bolts 1023 above this position are separated from the mounting slide 1022, and the crane or hoist is started to connect with the lifting ring 241 on the tower top 24, and the tower top 24 and the corresponding intermediate ring tubes 26 are lifted. At this time, the intermediate ring tube 26 can be directly disassembled, replaced or added from the corresponding position in the vertical mounting frame 10, which can reduce the difficulty of changing the fly ash washing efficiency of the turntable extraction tower 2.
[0123] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.
Claims
1. A continuous water washing device for fly ash from domestic waste incineration, characterized in that: include: A slurrying mechanism (1), the slurrying mechanism (1) is used to mix fly ash and slurrying water to form fly ash slurry; A rotary disc extraction tower (2), wherein the rotary disc extraction tower (2) is vertically arranged, the pulping mechanism (1) is connected to the middle and upper part of the rotary disc extraction tower (2); the lower part of the rotary disc extraction tower (2) is connected to a water inlet pipe (21); and a rotary disc extraction component (22) is arranged in the rotary disc extraction tower (2); a first solid-liquid separation mechanism (3), the first solid-liquid separation mechanism (3) being in communication with the lower end of the rotary disc extraction tower (2), and the first solid-liquid separation mechanism (3) being used for performing solid-liquid separation on the precipitated material in the rotary disc extraction tower (2); A second solid-liquid separation mechanism (4), the second solid-liquid separation mechanism (4) is connected to the upper end of the rotary disc extraction tower (2), and the second solid-liquid separation mechanism (4) is used to perform solid-liquid separation on the extraction solution overflowing from the rotary disc extraction tower (2).
2. The continuous water washing equipment for domestic waste incineration fly ash according to claim 1, characterized in that: It also includes an evaporator (7), the filtrate outlet of the second solid-liquid separation mechanism (4) is connected to the evaporator (7), and the condensed water outlet of the evaporator (7) is connected to the water inlet pipe (21).
3. The continuous water washing equipment for fly ash from domestic waste incineration according to claim 1 is characterized in that: The filtrate outlet of the first solid-liquid separation mechanism (3) is in communication with the pulping mechanism (1).
4. A continuous water washing process for fly ash from incineration of domestic waste, using the continuous water washing equipment for fly ash from incineration of domestic waste according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, passing fly ash and slurrying water into the slurrying mechanism (1) to mix and form fly ash slurry; S2, injecting the fly ash slurry into the rotary disc extraction tower (2) from the middle and upper part of the rotary disc extraction tower (2), and injecting the washing water into the rotary disc extraction tower (2) from the lower part of the rotary disc extraction tower (2); S3, transporting the precipitated material settled at the bottom of the rotary disc extraction tower (2) to the first solid-liquid separation mechanism (3), and the first solid-liquid separation mechanism (3) performs solid-liquid separation on the precipitated material; S4, transporting the extraction solution overflowing from the upper part of the rotary disc extraction tower (2) to the second solid-liquid separation mechanism (4), and the second solid-liquid separation mechanism (4) performs solid-liquid separation on the extraction solution.
5. A continuous water washing process for fly ash from domestic waste incineration according to claim 4, characterized in that: After step S4, the following steps are further included: The water and soluble salts in the filtrate discharged from the second solid-liquid separation mechanism (4) are separated, and the separated water is refluxed into the rotary disc extraction tower (2) as the washing water in step S2.
6. A continuous water washing process for fly ash from domestic waste incineration according to claim 5, characterized in that: The separation of water and soluble salts in the filtrate is carried out by evaporation crystallization process.
7. The continuous water washing process for fly ash from domestic waste incineration according to claim 4, characterized in that: After step S3, the following steps are further included: The filtrate discharged from the first solid-liquid separation mechanism (3) is returned to the pulping mechanism (1) as pulping water in step S1.
8. The continuous water washing process for fly ash from domestic waste incineration according to claim 4, characterized in that: In step S2, the following step is also included: adding flocculant into the rotary disc extraction tower (2).
9. The continuous water washing process for fly ash from domestic waste incineration according to claim 4, characterized in that: In step S1, when preparing the fly ash slurry, the mass ratio of fly ash to water is (1-2):
1.
10. The continuous water washing process for fly ash from domestic waste incineration according to claim 4, characterized in that: In step S2, the mass ratio of the fly ash slurry injected into the rotary disc extraction tower (2) to water is (2-3):1.