Novel high-efficiency belt type fly ash washing equipment

Abstract

The utility model relates to fly ash water washing technical field, concretely relates to a novel belt formula high -efficient fly ash water washing equipment, including fly ash jar, still be equipped with grating plate in mixed jar, the top one side of mixed jar is connected with liquid inlet pipe, and the bottom one side is connected with blowdown pipe, still be equipped with detection spare in mixed jar, still be equipped with water washing structure in the right upper side of mixed jar, and water washing structure includes support frame, driving roller, from driving roller, shake and beat carrier roller, belt and adjusting spare, still be equipped with the wave shape fender of symmetry distribution on the belt, still fixedly installed horizontal bulkhead between two wave shape fenders, adjusting spare is used for dividing belt into horizontal section and inclined section, and can complete the adjustment operation of different inclination angles, and shake and beat carrier roller is even multiple, and the projection of even distribution is arranged on shake and beat carrier roller. The utility model shortens the quantity of water washing and filter press equipment, reduces the cost, adopts multilayer countercurrent water washing structure simultaneously, avoids the flat, and the structure is compact, effectively improves the operation efficiency and quality of fly ash water washing.

Description

Technical Field

[0001] This utility model relates to the field of fly ash washing technology, specifically to a novel belt-driven high-efficiency fly ash washing device. Background Technology

[0002] Currently, the main methods for disposing of fly ash from waste incineration include landfill disposal and co-processing in cement kilns. Landfill disposal faces challenges such as high disposal pressure and significant land occupation due to the large volume of fly ash generated and scarce land resources in large and medium-sized cities. While co-processing in cement kilns is widely advocated, the soluble chloride content in fly ash from waste incineration in my country is generally high. Direct injection into cement kilns for co-processing is only suitable for fly ash with a chloride ion content of less than 3%, and improper control of the feed rate can easily cause problems such as scaling inside the kiln, equipment corrosion, and pipeline blockage. Furthermore, the high chloride content material generated from bypass ventilation is also difficult to effectively dispose of. Fly ash washing is a common method for removing water-soluble salts, especially chloride ions, from fly ash. Multi-stage countercurrent washing technology, by dividing the washing process into multiple stages—using low-concentration liquid to wash low-salt ash and high-concentration brine to wash high-salt ash—effectively reduces the liquid-to-solid ratio and improves washing efficiency. However, existing multi-stage countercurrent washing technologies for fly ash still have several drawbacks: countercurrent washing often requires three or more sets of washing agitation and solid-liquid separation equipment, resulting in excessive equipment usage, large footprint, high equipment costs, and long investment recovery periods. Furthermore, existing processes lack precise control over agitation intensity and water consumption during washing, making it difficult to achieve optimal washing results. This leads to high energy consumption and high processing costs, limiting the further promotion and application of multi-stage countercurrent washing technology for fly ash.

[0003] Further detailed analysis of the defects and shortcomings of existing technologies: Existing multi-stage countercurrent water washing processes and devices for fly ash mostly adopt a graded "water washing + filter press + crushing" process, with the number of water washings corresponding one-to-one with the number of filter presses and crushings. This configuration results in too many filter presses, complicated processes, and increased costs. Existing multi-stage countercurrent water washing processes and devices for fly ash mostly adopt a "flat layout," which is complex in structure, with water tanks and other equipment occupying a large area and incurring high costs, making it difficult to meet the actual situation of insufficient space for modification. Existing multi-stage countercurrent water washing processes and devices for fly ash do not employ professional measuring equipment such as online salinity meters and online sludge concentration meters. Although the countercurrent water washing process is completed, it is unknown whether the Na, K, and Cl ions in the final effluent are saturated. If not saturated, it will result in a waste of water resources and increased costs. If saturation is not achieved in the final water washing stage, it will affect the desalination effect of the water washing and may affect the resource utilization products of the fly ash downstream (such as aggregates, ceramsite, concrete admixtures, etc.) (which have requirements for fly ash salt content). Summary of the Invention

[0004] To address the shortcomings and deficiencies of existing fly ash washing processes, this invention provides a novel belt-type high-efficiency fly ash washing equipment that reduces the number of washing and filter press devices, simplifies the process, reduces costs, adopts a multi-layer counter-current washing structure to avoid flat laying, has a compact structure, and greatly improves the efficiency of fly ash washing operations.

[0005] This utility model achieves the above objectives by adopting the following technical solution: A novel belt-driven high-efficiency fly ash washing device includes a fly ash tank. The input end of the fly ash tank is connected to an external fly ash source via a feed pipe, and the output end is connected to a mixing tank via a discharge pipe. The mixing tank is vertically arranged and has a cover plate at the top. Horizontally distributed grid plates are also provided inside the mixing tank. A stirring motor is mounted on the cover plate via a bracket. The output shaft of the stirring motor is connected to a vertically distributed rotating shaft, on which a spiral blade is mounted. A liquid inlet pipe is connected to one side of the top of the mixing tank, and a drain pipe is connected to one side of the bottom. A detection device is also provided inside the mixing tank to detect the chloride ion content in the solution and to provide visual and automatic release of the upper liquid. A washing structure is also provided on the upper right side of the mixing tank. The washing structure includes a support frame, a driving roller, a driven roller, a vibrating roller, a belt, and adjusting components. The support frame is vertically arranged, and the driving roller is rotatably mounted on the left side of the support frame and connected to a drive motor. The moving roller is rotatably mounted on the right side of the support frame. The belt is positioned between the driving roller and the driven roller, and the belt is also provided with symmetrically distributed corrugated sidewalls. A transverse partition is fixedly installed between two of the corrugated sidewalls. The adjusting component is used to divide the belt into horizontal and inclined sections, and can perform different inclination angle adjustments. There are multiple evenly distributed vibrating rollers, all mounted on the support frame and located in the inclined section. The vibrating rollers are provided with evenly distributed protrusions. An inclined water collection trough is also provided on the support frame and below the belt. A mud storage tank is also provided below the end of the inclined section. The output end of the mud storage tank is connected to a filter press through a conveying pipe. One end of the filter press is also connected to a first liquid storage tank through a drain pipe, and the output end is also connected to a screw conveyor. The first liquid storage tank is connected to the inclined section through a return pipe. A clean water filling structure is also provided on one side of the support frame to complete the water replenishment operation for the fly ash washing operation in the inclined section.

[0006] As a preferred technical solution: a manual slide gate valve is also provided on the discharge pipe, and a rotary valve is also provided on the discharge pipe and below the manual slide gate valve.

[0007] A further preferred technical solution: the connection points of the rotating shaft with the cover plate and the grid plate are respectively equipped with sealed ball bearings; the inlet pipe is also equipped with a ball valve, an electromagnetic flow meter, an electric valve and a ball valve in sequence from left to right; the drain pipe is also equipped with a ball valve, a sludge pump and a ball valve in sequence from left to right, and the output end of the drain pipe leads to the horizontal section.

[0008] A further preferred technical solution: The detection device includes an online chloride ion salinity meter, an LED display screen, and an outlet pipe; the online chloride ion salinity meter is fixedly installed inside the mixing tank by a bracket and located above the grid plate, and the LED display screen is located outside the mixing tank; a ball valve, an electric valve, and another ball valve are sequentially installed on the outlet pipe from left to right; the online chloride ion salinity meter is connected to the LED display screen and the electric valve on the outlet pipe respectively; the output end of the outlet pipe is also sequentially connected to a precipitation tank and a second storage tank, so that the solution with completely saturated chloride ions eventually flows to the MVR.

[0009] A further preferred technical solution: a splash guard is provided on one side of the mixing tank, and a diversion plate is provided on the lower left of the water collection tank. The splash guard and the diversion plate together form a liquid flow channel, and the output end of the liquid flow channel finally leads to the mixing tank.

[0010] As a preferred technical solution: the diaphragm includes a frame and a filter screen disposed within the frame; wherein the mesh size of the filter screen is such that water can pass through but fly ash cannot during the solid-liquid mixing after each stage of washing.

[0011] As a preferred technical solution: the adjusting component includes a lower idler roller, an upper idler roller, a U-shaped frame, and a hydraulic cylinder; both the upper and lower idler rollers are mounted on the support frame and are located at the inflection point between the horizontal and inclined sections. The lower idler roller maintains surface contact with the inner wall of the lower belt, and the upper idler roller maintains surface contact with the outer edge of the upper end face of the upper belt. Furthermore, the upper idler roller does not interfere with the transverse partition. The U-shaped frame is mounted on the driven roller. One end of the hydraulic cylinder is rotatably mounted on the support frame, and the other end is rotatably mounted on the U-shaped frame. The inclination angle of the inclined section is 0-15 degrees.

[0012] As a preferred technical solution: a ball valve, a sludge pump and a ball valve are sequentially installed on the feed pipe along the output direction; a ball valve, an electric valve and a ball valve are sequentially installed on the drain pipe along the output direction; a ball valve, a liquid pump, an electric valve and a ball valve are sequentially installed on the return pipe along the output direction; and an air knife is also provided on the support frame and below the end of the inclined section.

[0013] A further preferred technical solution: The first liquid storage tank is also provided with baffles and filter elements. The baffles are two baffles distributed vertically and in a ring shape, forming an installation cavity between them. The filter element includes activated carbon particles, air filter cotton and non-woven fabric distributed sequentially from the inside to the outside.

[0014] A further preferred technical solution: The clean water filling structure includes a clean water pipeline and ball valves, electromagnetic flow meters, electric valves and ball valves arranged sequentially on the clean water pipeline; the output ends of the clean water pipeline and the return pipe are both oriented towards the middle and upper part of the inclined section.

[0015] The advantages of this invention compared to existing technologies are as follows: This invention, through optimized design and improved new washing technology, requires only one filter press and washing process, significantly reducing the number of washing and filter press devices, simplifying the process, and reducing costs. Furthermore, this invention innovatively designs a new belt structure and a new belt-type multi-stage counter-current washing technology. With a rational spatial arrangement and a multi-layer counter-current washing structure, it avoids flat layouts, resulting in a compact structure and low footprint. This primarily solves the problems of existing fly ash multi-stage counter-current washing processes and devices, which often employ a "flat" layout and have complex structures. In practical applications, this invention can address situations with limited space during on-site modifications, making it more adaptable. Furthermore, this invention incorporates an "online chloride ion detector" at the mixing tank to detect the chloride ion content in the solution. Once the chloride ion content reaches its peak, the upper layer of liquid in the agitator is released and, after multiple processing steps, is sent to the MVR for salt separation. This directly saves energy consumption during MVR evaporation and crystallization, thus avoiding the problem of significantly reduced chloride ion removal efficiency from fly ash washing, which fails to meet the resource utilization requirements for chloride ion content in fly ash. This makes it more practical. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a simplified diagram illustrating the overall structure and working principle of this utility model. Figure 2 This is a three-dimensional structural diagram of the overall structure of this utility model; Figure 3 This is a schematic diagram of the internal structure of the mixing tank of this utility model; Figure 4 This is a partial enlarged view of the water washing structure of this utility model; Figure 5 This is a structural diagram of the transverse partition of this utility model; Figure 6 This is a schematic diagram of the structure of the vibrating roller of this utility model; Figure 7This is a magnified view of a portion of the adjusting component of this utility model.

[0018] In the diagram: 1. Fly ash tank; 101. Feed pipe; 102. Discharge pipe; 103. Manual slide gate valve; 104. Rotary valve; 2. Mixing tank; 201. Cover plate; 202. Grid plate; 203. Agitator motor; 204. Shaft; 205. Spiral blade; 206. Liquid inlet pipe; 207. Sewage pipe; 208. Ball valve; 209. Electromagnetic flow meter; 210. Electric valve; 211. Sludge pump; 212. Splash shield; 213. Drain plate; 214. Liquid flow channel; 215. Air knife; 216. Liquid pump; 3. Detection components; 301. Online chloride ion salinity meter; 302. LED display screen; 303. Liquid outlet pipe; 304. Sedimentation tank; 305. Second liquid storage tank. 306. Tank; 4. Flip plate; 5. Washing structure; 6. Support frame; 7. Driven roller; 8. Driven roller; 9. Vibrating roller; 10. Belt; 11. Adjusting component; 12. Drive motor; 13. Wave-shaped sidewall; 14. Horizontal partition; 15. Horizontal section; 16. Inclined section; 17. Protrusion; 18. Water collection tank; 19. Frame; 200. Filter screen; 201. Lower roller; 202. Upper roller; 313. U-shaped frame; 414. Hydraulic cylinder; 5. Sludge storage tank; 601. Conveying pipe; 7. Filter press; 801. Drainage pipe; 9. First storage tank; 101. Screw conveyor; 11. Clean water filling structure; 12. Clean water pipeline. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that, in the specific embodiments of this utility model, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the use of phrases such as "comprising one" to define an element does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "equipped" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example: Figures 1 to 7 As shown: A novel belt-driven high-efficiency fly ash washing device includes a fly ash tank 1, such as... Figure 2 As shown, the fly ash tank has an inverted structure, with the input at the top and the output at the bottom. Specifically, it can be elevated using a base frame to provide sufficient space for the subsequent mixing tank. The input end of the fly ash tank 1 is connected to an external fly ash source via a feed pipe 101, and the output end is connected to the mixing tank 2 via a discharge pipe 102; the discharge pipe is vertically aligned and leads to the mixing tank. A manual slide valve 103 is also provided on the discharge pipe 102, and a rotary valve 104 is located on the discharge pipe 102 and below the manual slide valve 103. This arrangement facilitates control of the fly ash feed.

[0023] like Figure 3As shown: In this embodiment, the mixing tank 2 is vertically arranged and has a cover plate 201 at the top. A horizontally distributed grid plate 202 is also provided inside the mixing tank 2, and the grid plate is fixedly connected to the inner wall of the mixing tank via a slot. A stirring motor 203 is also mounted on the cover plate 201 via a bracket. The output shaft of the stirring motor 203 is connected to a vertically distributed rotating shaft 204, and a spiral blade 205 is provided on the rotating shaft 204. With this configuration, when the stirring motor is started, it drives the rotating shaft and the spiral blade to stir the fly ash mixture. Sealed ball bearings are provided at the connections between the rotating shaft 204 and the cover plate 201 and the grid plate 202, respectively; this configuration aims to ensure normal stirring operation while improving the sealing effect of the connections. Figure 1 As shown: From left to right, a ball valve 208, an electromagnetic flowmeter 209, an electric valve 210, and another ball valve 208 are also installed on the inlet pipe 206. The inlet pipe is used to add clean water. Figure 2 As shown: A splash guard 212 is also provided on one side of the mixing tank 2, specifically near the belt, to prevent water from flowing down and splashing, ensuring environmental hygiene. A diversion plate 213 is also provided on the lower left side of the water collection tank 413. The splash guard 212 and the diversion plate 213 together form a liquid flow channel 214, the output end of which leads to the mixing tank 2. The purpose of this arrangement is to facilitate the centralized collection and recycling of the liquid from the multi-stage countercurrent washing and to further process it in the mixing tank. It also collects water droplets that fall during the belt's return journey, keeping the equipment clean and tidy, and allows the water to be recycled back to the mixing tank for reuse.

[0024] like Figure 1 and Figure 3 As shown: In this embodiment, a liquid inlet pipe 206 is connected to one side of the top of the mixing tank 2, and a drain pipe 207 is connected to one side of the bottom. The liquid inlet pipe is used to replenish clean water. The drain pipe is used to discharge the fly ash after stirring and settling. A ball valve 208, a sludge pump 211, and another ball valve 208 are also installed on the drain pipe 207 from left to right. This arrangement ensures the output of fly ash sediment. The output end of the drain pipe 207 leads to the horizontal section 410, which serves as the initial stage of multi-stage fly ash washing. The mixing tank 2 is also equipped with a detection element 3 to detect the chloride ion content in the solution and provide a visual and automatic function to release the upper liquid. Figure 3As shown: In a preferred embodiment, the detection element 3 includes an online chloride ion salinity meter 301, an LED display screen 302, and an outlet pipe 303. The online chloride ion salinity meter 301 is fixedly installed inside the mixing tank 2 by a bracket and is located above the grid plate 202, used to detect the chloride ion content in the solution. The LED display screen 302 is located on the outside of the mixing tank 2; a ball valve 208, an electric valve 210, and another ball valve 208 are also installed sequentially from left to right on the outlet pipe 303. The online chloride ion salinity meter 301 is connected to the LED display screen 302 and the electric valve 210 on the outlet pipe 303, respectively, and can be automated by connecting to a PLC controller. The LED display screen is used to display the chloride ion content parameter of the solution in the mixing tank in real time.

[0025] like Figure 1 and Figure 2 As shown: The output end of the outlet pipe 303 is also connected in sequence to a sedimentation tank 304 and a second storage tank 305, ensuring that the solution, fully saturated with chloride ions, ultimately flows to the MVR. The sedimentation tank 304 is equipped with a flap 306, a solid structure, vertically distributed and shorter than the height of the sedimentation tank 304, used to achieve sedimentation, filtration, and interception of fly ash impurities. When the online chloride ion salinity meter detects that the chloride ion content in the solution has reached its peak, the electric valve on the outlet pipe is opened, releasing the upper layer of static liquid from the mixing tank. After undergoing multiple processing steps, the liquid is sent to the MVR for salt separation. Simultaneously, fresh water is added to the mixing tank to dilute the chloride ion concentration, and a countercurrent multi-stage water wash is performed on the conveyor belt until the chloride ion content reaches its peak, repeating this process. This ensures that the liquid going to the MVR is fully saturated with chloride ions. MVR, or fly ash water washing and desalination, is a device used to treat fly ash from waste incineration. Its main purpose is to remove chloride ions from the fly ash and convert it into cement clinker and industrial salt through a cement kiln co-processing system.

[0026] like Figure 2 and Figure 4As shown: In this embodiment, a washing structure 4 is also provided on the upper right side of the mixing tank 2. The washing structure 4 includes a support frame 401, a drive roller 402, a driven roller 403, a vibrating roller 404, a belt 405, and an adjusting component 406. The support frame 401 is vertically distributed. The drive roller 402 is rotatably disposed on the left side of the support frame 401 and is connected to a drive motor 407. The drive motor is a variable frequency motor and can also be connected to a reducer to adjust and set the belt running speed. In this embodiment, considering both the safe conveying of the belt and the efficiency of fly ash washing, the speed at which the drive motor drives the conveyor belt is slow enough to meet the effect of multi-stage fly ash washing. The driven roller 403 is rotatably disposed on the right side of the support frame 401 to support and drive the conveyor belt. The belt 405 is positioned between the driving roller 402 and the driven roller 403. The belt 405 also features symmetrically distributed corrugated sidewalls 408, located inside the belt and separated from the outer end wall by a gap. The belt serves as the carrier for transportation and washing, and conforms to the corrugated sidewall belt standard of HG / T 4062-2023. Further structural optimization and upgrades are implemented by fixing a transverse partition 409 between the two corrugated sidewalls 408; these two components are fixed and sealed to prevent liquid from leaking out through the gap. Figure 6 As shown: The transverse partition 409 includes a frame 414 and a filter screen 415 disposed within the frame 414; wherein the mesh size of the filter screen 415 is such that water can pass through but fly ash cannot during the solid-liquid mixing after each stage of water washing.

[0027] like Figure 2 and Figure 7 As shown: In this embodiment, the adjusting member 406 is used to divide the belt 405 into a horizontal section 410 and an inclined section 411, and can complete the adjustment operation of different inclination angles; the inclined section is the main part of the multi-stage countercurrent water washing of fly ash. Figure 4As shown: In a preferred embodiment, the adjusting component 406 includes a lower idler roller 416, an upper idler roller 417, a U-shaped frame 418, and a hydraulic cylinder 419. Both the upper idler roller 417 and the lower idler roller 416 are mounted on the support frame 401, located at the inflection point between the horizontal section 410 and the inclined section 411. The lower idler roller 416 maintains surface contact with the inner wall of the lower belt 405, while the upper idler roller 417 maintains surface contact with the outer edge of the upper end face of the upper belt 405. The upper idler roller 417 is shorter and does not interfere with the transverse partition 409; that is, the upper idler roller is positioned at the empty edge of the belt, used to press and limit the movement of the belt at the bend. The U-shaped frame 418 is mounted on the driven roller 403. One end of the hydraulic cylinder 419 is rotatably mounted on the support frame 401, and the other end is rotatably mounted on the U-shaped frame 418. In a preferred embodiment, the inclination angle of the inclined section 411 is 0-15 degrees. This arrangement allows for adjustment of the angle between the inclined section and the horizontal section, enabling better testing of the relationship between different fly ash treatment volumes and water flow rates. An air knife 215 is also provided on the support frame 401, below the end of the inclined section 411. This arrangement aims to blow down fly ash slurry that cannot fall down by gravity.

[0028] like Figure 1 and Figure 6 As shown: In this embodiment, there are multiple evenly distributed vibrating rollers 404, all mounted on the support frame 401 and located on the inclined section 411. The vibrating rollers 404 are provided with evenly distributed protrusions 412. The purpose of this arrangement is to create an up-and-down jogging motion on the belt during operation, producing a "vibrating" effect to dislodge fly ash particles clogging the filter screen. An inclinedly distributed water collection trough 413 is also provided on the support frame 401, below the belt 405, for collecting liquid. Figure 1 and Figure 2 As shown: A sludge storage tank 5 is also provided below the end of the inclined section 411, that is, the fly ash slurry that has undergone multi-stage countercurrent water washing is discharged into the sludge storage tank through the inclined section. The output end of the sludge storage tank 5 is connected to a filter press 6 through a conveying pipe 501. The filter press is existing technology and is mainly used for solid-liquid separation, so its structure will not be described in detail. One end of the filter press 6 is also connected to a first liquid storage tank 7 through a drain pipe 601, and the output end is also connected to a screw conveyor 8. The first liquid storage tank 7 is connected to the inclined section 411 through a return pipe 701; a ball valve 208, a sludge pump 211, and a ball valve 208 are also installed sequentially along the output direction on the conveying pipe 501. A ball valve 208, an electric valve 210, and a ball valve 208 are also installed sequentially along the output direction on the drain pipe 601. The return pipe 701 is also equipped with a ball valve 208, a liquid pump 216, an electric valve 210, and a ball valve 208 in sequence along the output direction.

[0029] like Figure 1and Figure 2 As shown, a clean water supply structure 9 is also provided on one side of the support frame 401 to replenish water for the fly ash washing operation in the inclined section 411. Thus, the water source for fly ash countercurrent washing mainly consists of the output from the return pipe and a continuous replenishment of clean water. In a preferred embodiment, the clean water supply structure 9 includes a clean water pipeline 901 and ball valves 208, electromagnetic flowmeters 209, electric valves 210, and ball valves 208 arranged sequentially on the clean water pipeline 901. The output ends of both the clean water pipeline 901 and the return pipe 701 face the upper middle part of the inclined section 411. One end of the clean water pipeline 901 is connected to a liquid pump to provide a power supply for the water flow.

[0030] Working Principle: Fly ash enters the mixing tank from the fly ash tank via a manual gate valve and rotary valve. Simultaneously, water is injected into the mixing tank through the inlet pipe. The fly ash and water are mixed by the rotating shaft and spiral blades inside the mixing tank. The fly ash solid-liquid mixture is then turbulent by the grid plates, causing large fly ash particles to gradually settle at the bottom of the mixing tank, while the clearer water remains above the grid plates. The fly ash slurry settled at the bottom of the mixing tank is pumped into the conveyor belt washing structure via a sludge pump. The conveyor belt is arranged initially horizontally and then inclined, running diagonally upwards. Initially, clean water (provided by the clean water injection structure) is injected from above the inclined section of the conveyor belt, with the water generally flowing downwards and the fly ash slurry flowing upwards. Gradually, each partition is filled with water and fly ash slurry. Simultaneously, due to the gravitational potential energy of the water, the fly ash slurry and water are thoroughly mixed and washed between the partitions. The washed fly ash slurry will undergo further washing with water from above, which has an even lower chloride content. This water will then flow into the next compartment and wash with the fly ash slurry from that compartment, and so on, level by level. Overall, on the same conveyor belt, from bottom to top, the chloride ion content of the fly ash slurry decreases, while from top to bottom, the chloride ion content of the water increases.

[0031] In this embodiment, an online chloride ion salinity meter is installed in the mixing tank to detect the chloride ion content in the solution. Once the chloride ion content in the solution reaches its peak, the clear liquid in the upper layer of the mixing tank is released and sent to the MVR for salt separation after being processed through multiple steps in the process flow diagram. At the same time, fresh water is added to the mixing tank to dilute the chloride ion concentration and perform a water washing process until the chloride ion content reaches its peak. This process is repeated.

[0032] In this embodiment, the conveyor belt adopts the corrugated sidewall conveyor belt of HG / T 4062-2023. The difference lies in the optimization and upgrading of this industry standard structure. Specifically, the cross diaphragms are fixed and sealed to the corrugated sidewalls to prevent liquid from flowing out through the gaps. The mesh size of the filter screen ensures that water can pass smoothly through the solid-liquid mixture after each wash, but not fly ash. The water from the multi-stage washing on the conveyor belt flows into the mixing tank for the next mixing cycle. The clean water from the subsequent mixing tank is used for subsequent water replenishment. The washed fly ash slurry is initially filtered by the filter screen on the conveyor belt washing structure and collected in the sludge storage tank. It is then pumped to the filter press by a sludge pump. The fly ash cake formed by the filter press is conveyed by a screw conveyor to the resource utilization process (aggregate, cement, ceramsite, etc.). Simultaneously, the water from the filter press is pumped through a storage tank and pumped to the inclined section of the conveyor belt for fly ash washing.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel belt-driven high-efficiency fly ash washing device, characterized in that: The system includes a fly ash tank, whose input end is connected to an external fly ash source via a feed pipe, and whose output end is connected to a mixing tank via a discharge pipe. The mixing tank is vertically positioned and has a cover plate at the top. Horizontally distributed grid plates are also provided inside the mixing tank. A stirring motor is mounted on the cover plate via a bracket, and the output shaft of the stirring motor is connected to a vertically distributed rotating shaft with spiral blades. A liquid inlet pipe is connected to one side of the top of the mixing tank, and a drain pipe is connected to one side of the bottom. A detection device is also provided inside the mixing tank. A water washing structure is also provided on the upper right side of the mixing tank. The water washing structure includes a support frame, a driving roller, a driven roller, a vibrating roller, a belt, and adjusting components. The support frame is vertically positioned, with the driving roller rotatably mounted on the left side of the support frame and connected to a drive motor. The driven roller is rotatably mounted on the right side of the support frame. The belt is positioned between the driving roller and the driven roller, and the belt also has symmetrically distributed corrugated baffles. A transverse partition is fixedly installed between the wave-shaped retaining edges; the adjusting component is used to divide the belt into horizontal and inclined sections, and can complete the adjustment of different inclination angles; there are multiple evenly distributed vibrating rollers, all set on the support frame and located in the inclined section, and evenly distributed protrusions are also provided on the vibrating rollers; an inclined water collection trough is also provided on the support frame and below the belt; a mud storage tank is also provided below the end of the inclined section, and the output end of the mud storage tank is connected to a filter press through a conveying pipe. One end of the filter press is also connected to a first liquid storage tank through a drain pipe, and the output end is also connected to a screw conveyor; wherein, the first liquid storage tank supplies water to the inclined section through a return pipe; a clean water filling structure is also provided on one side of the support frame; the clean water filling structure includes a clean water pipeline and ball valves, electromagnetic flow meters, electric valves, and ball valves arranged sequentially on the clean water pipeline; wherein, the output ends of the clean water pipeline and the return pipe are both facing the upper middle part of the inclined section.

2. The novel belt-type high-efficiency fly ash washing equipment as described in claim 1, characterized in that: A manual slide gate valve is also provided on the discharge pipe, and a rotary valve is also provided on the discharge pipe and below the manual slide gate valve.

3. The novel belt-driven high-efficiency fly ash washing equipment as described in claim 1, characterized in that: Sealed ball bearings are provided at the connection points of the rotating shaft with the cover plate and the grid plate respectively; a ball valve, an electromagnetic flow meter, an electric valve and a ball valve are also installed on the inlet pipe from left to right; a ball valve, a sludge pump and a ball valve are also installed on the drain pipe from left to right, and the output end of the drain pipe leads to the horizontal section.

4. The novel belt-type high-efficiency fly ash washing equipment as described in claim 3, characterized in that: The detection components include an online chloride ion salinity meter, an LED display screen, and an outlet pipe. The online chloride ion salinity meter is fixedly installed inside the mixing tank by a bracket and located above the grid plate. The LED display screen is located outside the mixing tank. From left to right, a ball valve, an electric valve, and another ball valve are installed on the outlet pipe. The online chloride ion salinity meter is connected to the LED display screen and the electric valve on the outlet pipe. The output end of the outlet pipe is connected to a sedimentation tank and a second storage tank. The sedimentation tank is also equipped with a flap, which is vertically distributed and its height is less than the height of the sedimentation tank.

5. A novel belt-driven high-efficiency fly ash washing device as described in claim 4, characterized in that: A splash guard is provided on one side of the mixing tank, and a flow guide plate is provided on the lower left side of the water collection tank. The splash guard and the flow guide plate together form a liquid flow channel, and the output end of the liquid flow channel finally leads to the mixing tank.

6. The novel belt-type high-efficiency fly ash washing equipment as described in claim 1, characterized in that: The diaphragm includes a frame and a filter screen disposed within the frame.

7. The novel belt-type high-efficiency fly ash washing equipment as described in claim 1, characterized in that: The adjusting components include a lower idler roller, an upper idler roller, a U-shaped frame, and a hydraulic cylinder. Both the upper and lower idler rollers are mounted on the support frame and located at the inflection point between the horizontal and inclined sections. The lower idler roller maintains surface contact with the inner wall of the lower belt, while the upper idler roller maintains surface contact with the outer edge of the upper end face of the upper belt. The upper idler roller does not interfere with the transverse partition. The U-shaped frame is mounted on the driven roller. One end of the hydraulic cylinder is rotatably mounted on the support frame, and the other end is rotatably mounted on the U-shaped frame. The inclination angle of the inclined section is 0-15 degrees.

8. A novel belt-type high-efficiency fly ash washing equipment as described in claim 1, characterized in that: A ball valve, a sludge pump, and a ball valve are sequentially installed on the feed pipe along the output direction; a ball valve, an electric valve, and a ball valve are sequentially installed on the drain pipe along the output direction; a ball valve, a liquid pump, an electric valve, and a ball valve are sequentially installed on the return pipe along the output direction; and an air knife is also provided on the support frame below the end of the inclined section.

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