Short-link fly ash recycling system

Abstract

The utility model relates to the technical field of fly ash treatment and resource utilization, and discloses a short-link fly ash resource utilization system, which comprises a fly ash pulping unit and a waste gas treatment unit, the fly ash pulping unit is used for mixing fly ash and water in proportion to form uniform slurry, the fly ash pulping unit is connected with a dissolution promoting reaction unit through a primary slurry discharge pipe, and the waste gas treatment unit is connected with a secondary slurry discharge pipe. The dissolution promoting reaction unit is used for adjusting the pH value of the slurry and promoting dissolution of calcium salt and chlorine salt, is connected with the precipitation separation unit through a mortar discharge pipe I and is used for solid-liquid separation to obtain a primary calcium chloride solution and concentrated mortar, the separated calcium chloride solution is treated by the weight removal unit, and then supernate is sent to the quality control unit. According to the fly ash recycling system, the solid-liquid separation mode and the combined backflow mode among the units in the fly ash recycling process are optimized, the number of devices and the operation process are simplified, the water consumption is reduced, and the energy consumption of the system is reduced, so that the economical efficiency and the flexibility of fly ash recycling are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fly ash treatment and resource utilization, in particular to a fly ash resource system with a short link. Background Technique

[0002] Fly ash is classified as hazardous waste due to the presence of various harmful substances such as heavy metals, benzene series, and dioxins, and its hazardous waste code is HW18. Since the "Technical Specification for Pollution Control of Municipal Solid Waste Incineration Fly Ash (Trial)" (HJ1134-2020) stipulates that "the soluble chlorine content in the fly ash treatment product should be controlled, and high-temperature processes, water washing processes, etc. can be used to remove soluble chlorine. The soluble chlorine content in the treatment product (high-temperature treatment product, fly ash after water washing, etc.) should not exceed 2%", preferably not higher than 1%. Therefore, the current mainstream fly ash treatment method is to pre-treat the fly ash by water washing and then carry out resource utilization or terminal disposal.

[0003] After retrieving the authorized patent document with the publication number CN117798179A, a resource utilization method for municipal solid waste incineration fly ash is disclosed. By adopting the method of three-stage countercurrent circulation ultrasonic enhanced water washing, under the stirring condition, combined with the effect of ultrasonic enhancement, chloride ions can be quickly eluted in only 5-10 minutes of water washing. Although the water consumption is reduced, in the three-stage countercurrent circulation ultrasonic enhanced water washing, the solid-liquid ratio used in each stage still reaches 1:3-4, and the washing liquid still needs processes such as reaction precipitation, solid-liquid separation, evaporation crystallization, filtration, and recrystallization to realize resource utilization.

[0004] The patent document with the publication number CN117600206A discloses a fly ash resource treatment system and process, including a low-temperature detoxification unit to remove dioxin substances from incinerated fly ash; a water washing unit to carry out countercurrent water washing on the detoxified fly ash; a heavy metal stabilization unit to solidify heavy metals in the washing liquid; a water washing and detoxification unit to capture heavy metals in the washing liquid to generate heavy metal precipitates; a softening unit to soften the detoxified washing liquid to reduce hardness; a membrane treatment unit to separate monovalent salts and divalent salts; a salt-making unit to carry out evaporation crystallization to make salt on the water produced by the membrane treatment unit, and recycle the condensed water to the water washing unit.

[0005] It can be seen that in the aspect of fly ash resource utilization, there are generally problems such as a large amount of water consumption in the water washing link (the total ash-water ratio in the whole water washing process is generally greater than 1:3), a complex subsequent resource utilization process, and high costs (whether directly evaporating and crystallizing or evaporating and crystallizing after membrane concentration, the energy consumption itself is high, and the water consumption in the water washing link is directly related to the evaporation amount. The greater the water consumption, the higher the operating cost); furthermore, a series of problems such as too many system equipment, complex operation, and frequent replacement of accessories are caused, ultimately resulting in poor economy of fly ash resource utilization and inability to be promoted in the market.

[0006] In addition, calcium oxide in the main components of fly ash accounts for about 40% of the total mass, and the soluble chlorides to be eluted also account for about 20% of the total mass. Therefore, how to recover calcium and chlorine elements energy-efficiently is the key to the resource utilization of fly ash. For this reason, the present invention proposes a system and method for the resource utilization of fly ash with a short link. Summary of the Utility Model

[0007] To make up for the above deficiencies, the present utility model provides a system for the resource utilization of fly ash with a short link, aiming to improve the problems of large water consumption for water washing, complex treatment process, and poor economy in the process of resource utilization of fly ash in the prior art.

[0008] To achieve the above object, the present utility model adopts the following technical solutions:

[0009] A system for the resource utilization of fly ash with a short link includes a fly ash pulping unit and an exhaust gas treatment unit. The fly ash pulping unit is used to mix fly ash and water in proportion to form a uniform slurry, which is connected to a dissolution promotion reaction unit through a primary slurry discharge pipe. The dissolution promotion reaction unit is used to adjust the pH value of the slurry and promote the dissolution of calcium salts and chloride salts. It is connected to a precipitation separation unit through a slurry discharge pipe 1 for solid-liquid separation to obtain a primary calcium chloride solution and concentrated ash slurry. The separated calcium chloride solution is sent to a quality control unit after being treated by a weight removal unit, and the precipitated sludge is transported to a wastewater treatment unit. The concentrated ash slurry enters a multi-stage water washing unit through a slurry discharge pipe 2. The multi-stage water washing unit is used for further dechlorination. The slurry after water washing in the multi-stage water washing unit enters a vortex separation unit through a slurry discharge pipe 3. The vortex separation unit is used for three-phase separation. The separated clear liquid is recycled to the fly ash pulping unit. The concentrated ash slurry first undergoes secondary water washing and then enters a mechanical solid-liquid separation unit. The mechanical solid-liquid separation unit is used for final solid-liquid separation to obtain filtrate and solid residue. The filtrate is refluxed to the water washing unit, and the solid residue is finally dechlorinated fly ash. The exhaust gas treatment unit is connected to the exhaust gas discharge ports of all units through an exhaust gas collection main pipe and is discharged after treatment.

[0010] Further, the fly ash pulping unit includes a pulping tank and a liquid level controller 1. The top of the pulping tank is provided with a fly ash inlet, a water inlet 1, a water inlet 2, a maintenance manhole 1, and an exhaust gas discharge port 1. The side of the pulping tank is provided with an overflow interface 1 and a slurry discharge port 1. The bottom of the pulping tank is provided with an emptying interface 1. The water inlet 1 is connected with a pipeline flowmeter 1 and a solenoid valve 1. The water inlet 2 is connected with a pipeline flowmeter 2. The fly ash inlet is connected with a weighing scale system. The liquid level controller 1 reads the liquid level signal in the pulping tank and transmits the signal to a speed control controller. A top drive variable frequency stirrer is installed on the top of the pulping tank. The slurry discharge port 1 is connected with a primary slurry discharge pipe, and the primary slurry discharge pipe is connected with a variable frequency booster pump 1 for transporting the prepared primary slurry to the subsequent dissolution promotion reaction unit.

[0011] Further, the dissolution-promoting reaction unit includes a reaction tank and a pH controller. The top of the reaction tank is provided with a first mortar inlet, a third water inlet, a fourth water inlet, a second maintenance manhole, and a second exhaust port. The side of the reaction tank is provided with a second overflow interface. The bottom of the reaction tank is provided with a second mortar discharge port. The first mortar inlet is connected to a pipeline flowmeter three. The third water inlet, the fourth water inlet, and the pH controller are all connected to a solvent-promoting adjustment module for controlling the operation rate of the overall reaction tank. The second mortar discharge port is connected to a first mortar discharge pipe, and the first mortar discharge pipe is connected to a variable-frequency booster pump two. A second liquid level controller is installed at the top of the reaction tank, and a first top-driven stirrer is installed at the top of the reaction tank.

[0012] Further, the precipitation separation unit includes a separation tank. An inverted annular guide plate is arranged inside the separation tank, which divides the volume inside the separation tank into a downward outer cavity and an upward inner cavity. An exhaust pressure balance hole is arranged at the top of the inverted annular guide plate. A circular water distribution pipe is mounted on the inner wall of the upper part of the downward outer cavity in a circle. A circular water collecting pipe is mounted on the inner wall of the upper part of the upward inner cavity in a circle. The middle part of the separation tank is a sedimentation-promoting filler area. The top of the separation tank is provided with a third maintenance manhole, a discharge hole, and a third exhaust port. The side of the separation tank is provided with a third overflow interface. The side of the separation tank is connected with a total water inlet pipe and a total water outlet pipe, which are respectively connected to the circular water distribution pipe and the circular water collecting pipe. The bottom of the separation tank is provided with a concentrated mortar discharge port, and the concentrated mortar discharge port is connected to a second mortar discharge pipe. The second mortar discharge pipe is connected to a solenoid valve two.

[0013] Further, small water distribution holes are arranged in the middle and lower parts of the circular water distribution pipe, and they are arranged in a plum blossom shape. The circular water distribution pipe is fixed on the inner wall of the downward outer cavity through a water distribution pipe hoop. Small water collecting holes are arranged in the middle and upper parts of the circular water collecting pipe, and they are arranged in a plum blossom shape. The small water collecting holes are fixed on the inner wall of the upward inner cavity through a water collecting pipe hoop.

[0014] Further, the water washing unit includes a water washing tank. The top of the water washing tank is provided with a second mortar inlet, a fifth water inlet, a sixth water inlet, a fourth maintenance manhole, and a fourth exhaust port. The side of the water washing tank is provided with a fourth overflow interface and a third mortar discharge port. The bottom of the water washing tank is provided with a second emptying interface. The second mortar inlet, the fifth water inlet, and the sixth water inlet are respectively connected to a pipeline flowmeter four, a pipeline flowmeter five, and a pipeline flowmeter six. The third mortar discharge port is connected to a third mortar discharge pipe, and the third mortar discharge pipe is connected to a variable-frequency booster pump three. A third liquid level controller is installed at the top of the water washing tank, and a second top-driven stirrer is installed at the top of the water washing tank.

[0015] Further, the eddy current separation unit includes a washing liquid storage tank and a concentrated ash slurry storage tank. The outside of the washing liquid storage tank and the concentrated ash slurry storage tank is connected by several groups of eddy current separators, and the center axis is connected by an ash discharge pipe. The top of the washing liquid storage tank is provided with an exhaust port five and a maintenance manhole five. The upper part is provided with a washing liquid discharge port, which is connected with a washing liquid discharge pipe. The bottom of the washing liquid storage tank is provided with an ash discharge port, and the ash discharge port is connected with an ash discharge pipe. A solenoid valve three is arranged on the ash discharge pipe, and the bottom of the ash discharge pipe is connected with the concentrated ash slurry storage tank. The bottom of the concentrated ash slurry storage tank is provided with an ash slurry discharge port four, and the ash slurry discharge port four is connected with an ash slurry discharge pipe four. The ash slurry discharge pipe four is connected with a solenoid valve four.

[0016] Further, a water-washed ash slurry access pipe is opened on the upper side of the eddy current separator, and a connecting conduit is arranged at the top. The connecting conduit is connected with the washing liquid storage tank. A conical pipe is arranged at the bottom of the connecting conduit, and the conical pipe is connected with the concentrated ash slurry storage tank. The upper parts of several eddy current separators are connected with an annular access main pipe, and the annular access main pipe is connected with a solenoid valve five and a variable-frequency slurry pump.

[0017] Further, the mechanical solid-liquid separation unit includes a mechanical separation module and a filtrate buffer pool, the gravity separation unit includes a reaction module and a gravity separation sedimentation tank, the quality control unit includes a detection module, a purification module and three primary calcium chloride temporary storage pools, the waste gas treatment unit includes a waste gas treatment module and a waste gas emission module, and the wastewater treatment unit includes a wastewater treatment module and a reclaimed water pool.

[0018] The utility model has the following beneficial effects:

[0019] 1. In the utility model, through the organic combination of fly ash dissolution promotion reaction, two-stage water washing, eddy current separation and mechanical solid-liquid separation, the process flow of fly ash resource utilization is greatly simplified, the bottleneck that the fly ash resource utilization system cannot be applied on a small scale is broken through, and the flexibility of fly ash resource utilization application is improved.

[0020] 2. In the utility model, through the application of the gravity type mud-water separation device and the integrated eddy current three-phase separation device, not only the continuous operation of the solid-liquid separation process is realized, the efficiency of ash slurry solid-liquid separation is greatly improved, but also the process characteristics of multiple water washings required for fly ash resource utilization are fully utilized, and the defect that the water content of the solid phase end is still relatively high after mud-water separation by the above two devices is effectively avoided, so that the operation of the whole system reaches the optimal solution.

[0021] 3. In the utility model, by optimizing the methods and parameters of solvent promoter addition, solid-liquid separation and liquid phase reflux between units in the process of fly ash resource utilization, the retention amount at the solid residue end can be greatly reduced, and then the equipment scale can be synchronously reduced, the water consumption and energy consumption can be effectively reduced, and finally the fly ash resource utilization has economic feasibility. Description of the Drawings

[0022] Figure 1 Flow chart of a fly ash resource utilization system with a short link proposed by the present utility model;

[0023] Figure 2 Structural sectional view of a fly ash pre-dissolving device with precise liquid level control in a fly ash resource utilization system with a short link proposed by the present utility model;

[0024] Figure 3 Structural sectional view of a top-driven stirring reaction device in a fly ash resource utilization system with a short link proposed by the present utility model;

[0025] Figure 4 Structural sectional view of a gravity type mud-water separation device in a fly ash resource utilization system with a short link proposed by the present utility model;

[0026] Figure 5 Structural diagram of a water distribution pipe and a water collection pipe in a gravity type mud-water separation device of a fly ash resource utilization system with a short link proposed by the present utility model;

[0027] Figure 6 Structural sectional view of a top-driven stirring and washing device in a fly ash resource utilization system with a short link proposed by the present utility model;

[0028] Figure 7 Structural diagram of an integrated eddy current separation device in a fly ash resource utilization system with a short link proposed by the present utility model;

[0029] Figure 8 Top view of the structure of an integrated eddy current separation device in a fly ash resource utilization system with a short link proposed by the present utility model.

[0030] Legend:

[0031] A1, Pulping tank; A2, Top-driven variable frequency stirrer; A3, Liquid level controller 1; A4, Fly ash inlet; A5, Incoming water inlet 1; A6, Incoming water inlet 2; A7, Maintenance manhole 1; A8, Exhaust gas outlet 1;

[0032] A9, Overflow interface 1; A10, Ash slurry outlet 1; A11, Drain interface 1; A12, Pipeline flowmeter 1;

[0033] A13, Solenoid valve 1; A14, Pipeline flowmeter 2; A15, Weighing scale system; A16, Speed controller;

[0034] A17, Initial pulp discharge pipe; A18, Variable frequency booster pump 1; B1, Reaction tank; B2, Top-driven stirrer 1;

[0035] B3. Level controller II; B4. pH controller; B5. Mortar inlet I; B6. Incoming water inlet III; B7. Incoming water inlet IV; B8. Maintenance manhole II; B9. Exhaust gas outlet II; B10. Overflow interface II; B11. Mortar discharge port II; B12. Pipeline flowmeter III; B13. Solubilizer adjustment module; B14. Mortar discharge pipe I; B15. Variable frequency booster pump II; C1. Separation tank; C2. Inverted annular baffle; C3. Downward outer cavity; C4. Upward inner cavity; C5. Air pressure balance hole; C6. Annular water distribution pipe; C7. Annular water collecting pipe; C8. Sedimentation and settlement filler area; C9. Maintenance manhole III; C10. Discharge hole; C11. Exhaust gas outlet III; C12. Overflow interface III; C13. Total water inlet pipe; C14. Total water outlet pipe; C15. Concentrated mortar discharge port; C16. Mortar discharge pipe II; C17. Solenoid valve II; C6-1. Water distribution small hole; C6-2. Water distribution pipe clamp; C7-1. Water collection small hole; C7-2. Water collection pipe clamp; D1. Washing tank; D2. Top drive agitator II; D3. Level controller III; D4. Mortar inlet II; D5. Incoming water inlet V; D6. Incoming water inlet VI; D7. Maintenance manhole IV; D8. Exhaust gas outlet IV; D9. Overflow interface IV; D10. Mortar discharge port III;

[0036] D11. Drainage interface II; D12. Pipeline flowmeter IV; D13. Pipeline flowmeter V; D14. Pipeline flowmeter VI; D15. Mortar discharge pipe III; D16. Variable frequency booster pump III; E1. Wash liquid storage tank; E2. Concentrated mortar storage tank; E3. Eddy current separator; E4. Ash discharge pipe; E5. Exhaust gas outlet V; E6. Maintenance manhole V; E7. Wash liquid discharge port; E8. Wash liquid discharge pipe; E9. Ash outlet; E10. Solenoid valve III; E11. Mortar discharge port IV; E12. Mortar discharge pipe IV; E13. Solenoid valve IV; E3-1. Washed mortar access pipe; E3-2. Connecting conduit; E3-3. Inverted conical pipe; E3-4. Annular access main pipe; E3-5. Solenoid valve V; E3-6. Variable frequency slurry pump. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Refer to Figure 1, an embodiment provided by the present utility model: a short-link fly ash resource utilization system, including a fly ash pulping unit and an exhaust gas treatment unit. The fly ash pulping unit is used to mix fly ash and water in proportion to form a uniform slurry, which is connected to a dissolution promotion reaction unit through a primary slurry discharge pipe A17. The dissolution promotion reaction unit is used to adjust the pH value of the slurry and promote the dissolution of calcium salts and chloride salts. It is connected to a precipitation separation unit through a slurry discharge pipe B14 for solid-liquid separation to obtain a primary calcium chloride solution and concentrated ash slurry. The separated calcium chloride solution is sent to a quality control unit after being treated by a heavy metal removal unit, and the supernatant is sent to the quality control unit, while the precipitated sludge is transported to a wastewater treatment unit. The concentrated ash slurry enters a multi-stage water washing unit through a slurry discharge pipe C16. The multi-stage water washing unit is used for further dechlorination. The slurry after water washing in the multi-stage water washing unit enters a vortex separation unit through a slurry discharge pipe D15. The vortex separation unit is used for three-phase separation. The separated clear liquid is recycled to the fly ash pulping unit. The concentrated ash slurry first undergoes secondary water washing and then enters a mechanical solid-liquid separation unit. The mechanical solid-liquid separation unit is used for final solid-liquid separation to obtain filtrate and solid residue. The filtrate is refluxed to the water washing unit, and the solid residue is the final dechlorinated fly ash. The exhaust gas treatment unit is connected to the exhaust gas discharge ports of all units through an exhaust gas collection main pipe and is discharged after treatment.

[0039] The mechanical solid-liquid separation unit includes a mechanical separation module and a filtrate buffer tank. The heavy metal removal unit includes a reaction module and a heavy metal removal sedimentation tank. The quality control unit includes a detection module, a purification module, and three primary calcium chloride temporary storage tanks. The exhaust gas treatment unit includes an exhaust gas treatment module and an exhaust gas discharge module. The wastewater treatment unit includes a wastewater treatment module and a recycled water tank.

[0040] Specifically, the present invention simplifies the process flow and realizes the efficient resource utilization of fly ash. The system includes a fly ash pulping unit and an exhaust gas treatment unit. The fly ash pulping unit accurately controls the mixing of fly ash and water in proportion to form a uniform slurry. The slurry enters the dissolution promotion reaction unit through the primary slurry discharge pipe A17, where the pH value is adjusted and the calcium salts and chloride salts are fully dissolved to generate a calcium chloride solution. Subsequently, the slurry is transported to the precipitation separation unit through the slurry discharge pipe for solid-liquid separation to obtain a primary calcium chloride solution and concentrated ash slurry.

[0041] The separated calcium chloride solution is removed of heavy metal impurities by the heavy metal removal unit, and the obtained supernatant is sent to the quality control unit for detection and purification to finally obtain a calcium chloride product meeting the standards. The precipitated sludge after heavy metal removal is transported to the wastewater treatment unit for treatment. The concentrated ash slurry enters a first-stage water washing unit through the slurry discharge pipe for further dechlorination treatment. The slurry after water washing enters the vortex separation unit through the slurry discharge pipe. In the vortex separation unit, the clear liquid after three-phase separation is recycled to the fly ash pulping unit, and the concentrated ash slurry enters the mechanical solid-liquid separation unit for final solid-liquid separation after further dechlorination in the secondary water washing unit. The filtrate is refluxed to the first-stage water washing unit, and the solid residue is used as the final dechlorinated fly ash product.

[0042] In order to ensure the environmental performance of the system, the waste gas treatment unit is connected to the waste gas outlets of all units through the waste gas collection main pipe, and the waste gas generated in each stage of the system is centrally treated to ensure that it meets the emission standards. The wastewater treatment unit receives the wastewater generated from the waste gas treatment and the precipitated sludge from the weight removal unit, and temporarily stores the treated reclaimed water in the reuse water pool and reuses it in the pulping unit. The dewatered sludge after wastewater treatment is outsourced for treatment.

[0043] The present invention effectively simplifies the process flow of fly ash resource treatment through the design of short links. The organic combination and circulation reflux design between the units greatly reduce the operating cost and energy consumption of the system, and realize the economy and environmental protection of fly ash treatment.

[0044] Among the units included in the above system, each unit is realized by a device respectively, the fly ash slurrying unit is a precise control pre-dissolution device, the dissolution-promoting reaction unit is a top-driven stirring reaction device, the sedimentation separation unit is a gravity-type mud-water separation device, the water washing unit is a top-driven stirring water washing device, and the eddy current separation unit is an integrated eddy current three-phase separation device.

[0045] The mechanical solid-liquid separation unit includes a mechanical separation module and a filtrate buffer tank, wherein the mechanical separation module includes but is not limited to plate and frame filter press, centrifugal separation device and other mature process devices for mud and water separation; the weight removal unit includes a reaction module and a weight removal sedimentation tank, wherein it includes but is not limited to flocculation sedimentation, electrolysis and other mature process devices for heavy metal removal; the quality control unit includes a detection module, a purification module and three primary calcium chloride temporary storage tanks (one for use, one for inspection and one for standby); the waste gas treatment unit includes a waste gas treatment module and a waste gas emission module, wherein the waste gas treatment module includes but is not limited to spray tower, activated carbon adsorption and other mature process devices for waste gas treatment; the wastewater treatment unit includes a wastewater treatment module and a reuse water tank, wherein the wastewater treatment unit includes a wastewater treatment module including but not limited to a multi-stage physicochemical precipitation system, MBR system and other mature process systems for wastewater treatment. The combined module.

[0046] Please see attached Figure 2, the fly ash pulping unit includes a pulping tank A1 and a level controller A3. The top of the pulping tank A1 is provided with a fly ash inlet A4, a first water inlet A5, a second water inlet A6, a maintenance manhole A7 and a first exhaust gas outlet A8. The side of the pulping tank A1 is provided with an overflow interface A9 and a first pulp discharge port A10. The bottom of the pulping tank A1 is provided with a first drain interface A11. The first water inlet A5 is connected with a pipeline flowmeter A12 and a solenoid valve A13. The second water inlet A6 is connected with a pipeline flowmeter A14. The fly ash inlet A4 is connected with a weighing scale system A15. The level controller A3 reads the liquid level signal in the pulping tank A1 and transmits the signal to the speed controller A16. A top-driven variable-frequency agitator A2 is installed at the top of the pulping tank A1. The first pulp discharge port A10 is connected with a primary pulp discharge pipe A17, and the primary pulp discharge pipe A17 is connected with a variable-frequency booster pump A18 for transporting the prepared primary pulp to the subsequent dissolution promotion reaction unit.

[0047] Specifically, as the core equipment, the top of the pulping tank A1 is provided with multiple interfaces, including a fly ash inlet A4, a first water inlet A5, a second water inlet A6, a maintenance manhole A7 and a first exhaust gas outlet A8. The fly ash inlet A4 is connected with a weighing scale system A15 to control the feeding amount of fly ash through weighing to ensure the accurate ratio of fly ash to water. The first water inlet A5 is connected with a pipeline flowmeter A12 and a solenoid valve A13 to control the flow of supplementary water from the outside. The second water inlet A6 is connected with a pipeline flowmeter A14 to access the internal circulating water of the system. The first exhaust gas outlet A8 at the top is used to discharge the gas generated during the pulping process and is connected to the exhaust gas treatment unit.

[0048] The side of the pulping tank A1 is provided with an overflow interface A9 and a first pulp discharge port A10. The overflow interface A9 is used to prevent the slurry from overflowing excessively, and the first pulp discharge port A10 is used to discharge the prepared primary pulp. The pulp enters the primary pulp discharge pipe A17 through the first pulp discharge port A10 and is then transported to the subsequent dissolution promotion reaction unit by the connected variable-frequency booster pump A18.

[0049] During the pulping process, the level controller A3 is responsible for real-time monitoring of the liquid level in the pulping tank A1 and transmitting the signal to the speed controller A16. The speed controller A16 adjusts the rotation speed of the top-driven variable-frequency agitator A2 according to the liquid level information to ensure the even mixing degree of the slurry. In addition, a first drain interface A11 is provided at the bottom of the pulping tank A1 for draining during equipment maintenance or emergency drainage.

[0050] The working principle of the above fly ash pulping unit is as follows: A certain amount of raw fly ash is weighed by the weighing scale system A15 and fed into the pulping tank A1 through the fly ash inlet A4. The washing liquid from the eddy current separation unit is completely introduced into the pulping tank A1 through the water inlet one A5. At the same time, the reclaimed water treated by the wastewater treatment unit is continuously injected into the pulping tank through the water inlet two. Read the data of the corresponding pipeline flowmeter and weighing scale system, and control the total mass ratio of the introduced solid fly ash and the liquid washing liquid and reclaimed water to be 1.0 - 2.0 by adjusting the dosage of raw fly ash and the amount of reclaimed water introduced controlled by the solenoid valve one A13. The liquid level controller one A3 reads the liquid level change signal in the pulping tank A1 and transmits the signal to the speed control controller A16 to adjust the stirring intensity of the top-driven variable-frequency stirrer A2 to ensure the pulping effect. During this process, the waste gas 1 in the pulping tank A1 is discharged through the waste gas outlet and enters the waste gas treatment system for treatment. After stirring and pulping for 10 - 30 minutes, a uniformly textured pre-dissolved primary pulp is prepared. The pre-dissolved primary pulp passes through the slurry discharge port one A10 and the primary pulp discharge pipe A17, and the prepared primary pulp is transported to the subsequent dissolution promotion reaction unit by the variable-frequency booster pump one A18.

[0051] Through the above design, the fly ash pulping unit of the present invention can accurately control the mixing ratio of fly ash and water, ensure the uniformity of the slurry, and achieve seamless connection with the subsequent treatment unit through systematic control and connection, ensuring the efficient progress of the entire fly ash resource treatment process.

[0052] Please refer to the appendix Figure 3 The dissolution promotion reaction unit includes a reaction tank B1 and a pH controller B4. The top of the reaction tank B1 is provided with a slurry inlet one B5, a water inlet three B6, a water inlet four B7, a maintenance manhole two B8, and a waste gas outlet two B9. The side of the reaction tank B1 is provided with an overflow interface two B10. The bottom of the reaction tank B1 is provided with a slurry discharge port two B11. The slurry inlet one B5 is connected with a pipeline flowmeter three B12. The water inlet three B6, the water inlet four B7, and the pH controller B4 are all connected with a dissolution promoter adjustment module B13 for controlling the operation rate of the overall reaction tank B1. The slurry discharge port two B11 is connected with a slurry discharge pipe one B14. The slurry discharge pipe one B14 is connected with a variable-frequency booster pump two B15. A liquid level controller two B3 is installed on the top of the reaction tank B1, and a top-driven stirrer one B2 is installed on the top of the reaction tank B1.

[0053] Specifically, the dissolution promotion reaction unit aims to generate a calcium chloride solution by controlling the pH value of the slurry and promoting the dissolution of calcium salts and chloride salts. The reaction tank B1 is the core equipment for the dissolution promotion reaction. It is equipped with multiple interfaces at the top, including the mortar inlet B5, the incoming water inlet three B6, the incoming water inlet four B7, the maintenance manhole B8, and the exhaust gas outlet B9. The mortar inlet B5 is connected to the pipeline flowmeter B12, which is used to accurately control the amount of mortar entering the reaction tank B1 to ensure the stability of the reaction process. The incoming water inlet three B6 and the incoming water inlet four B7 are respectively used to introduce the water and dissolution promoter required for the reaction. They are both connected to the dissolution promoter adjustment module B13 to accurately control the amount of solvent added.

[0054] Inside the reaction tank B1, a top-driven agitator one B2 is installed. The agitator ensures uniform mixing of the slurry in the tank through speed control to promote the dissolution of calcium salts and chloride salts. The pH controller B4 monitors the pH value of the slurry in real time and adjusts the amount of dissolution promoter added as needed to keep the pH value in the reaction tank B1 within the ideal range of 8 - 10. In addition, a liquid level controller two B3 is installed inside the reaction tank B1, which is responsible for monitoring the liquid level in the reaction tank B1 to prevent the liquid level from being too high or too low from affecting the reaction effect.

[0055] The side of the reaction tank B1 is provided with an overflow interface B10, which is used to discharge the excess slurry when the slurry is excessive to ensure the safety of the reaction in the tank. The mortar discharge port B11 at the bottom is connected to the mortar discharge pipe B14. The mixed mortar after the dissolution promotion reaction is transported to the next treatment stage through this pipeline. The mortar discharge pipe B14 is connected with a variable frequency booster pump B15, which is used to control the discharge speed and transportation pressure of the mortar to ensure that the slurry can be smoothly transported to the precipitation separation unit.

[0056] During the reaction process, the exhaust gas outlet B9 is used to discharge the exhaust gas generated during the reaction. These exhaust gases will be introduced into the exhaust gas treatment unit for treatment to ensure that they do not pollute the environment.

[0057] The pre-dissolved primary pulp produced by the fly ash pulping unit is pumped into reaction tank B1 through the fly ash inlet pump, and the promoter is continuously pumped into reaction tank B1 through the incoming water inlet three B6. The data of the liquid level controller two B3 and the pipeline flowmeter B12 are jointly read, and the addition amount of the promoter is accurately controlled through the promoter adjustment module B13, and the mass ratio of the promoter to the primary pulp is controlled at 0.5 - 1.0. With the continuous agitation of the top drive agitator one B2, the calcium salts and chloride salts in the fly ash in reaction tank B1 are continuously dissolved into calcium chloride solution. At the same time, through the joint control of the pH controller B4 and the promoter adjustment module B13, by adjusting the supplementary amounts of the promoter entering through the incoming water inlet three B6 and the regulator entering through the incoming water inlet four B7, the pH in reaction tank B1 is always controlled at 8 - 10. During this process, the waste gas 2 in reaction tank B1 is led out through the waste gas outlet two B9 and enters the waste gas treatment system for treatment. After 15 - 60 minutes of stirring and washing, the mixed mortar is prepared and is transported to the subsequent precipitation and separation unit by the variable frequency booster pump B15 through the mortar discharge port B11 and the mortar discharge pipe B14.

[0058] Please refer to the attached Figure 4 - attached Figure 5 , the precipitation and separation unit includes a separation tank C1. Inside the separation tank C1, there is an inverted ring-shaped guide plate C2, which divides the volume inside the separation tank C1 into a downward outer cavity C3 and an upward inner cavity C4. At the top of the inverted ring-shaped guide plate C2, there is an exhaust pressure balance hole C5. A ring-shaped water distribution pipe C6 is mounted on the upper wall of the downward outer cavity C3 in a circle, and a ring-shaped water collecting pipe C7 is mounted on the upper wall of the upward inner cavity C4 in a circle. The middle part of the separation tank C1 is a sedimentation and settlement packing area C8. At the top of the separation tank C1, there are an inspection manhole three C9, a discharge hole C10, and a waste gas outlet three C11. On the side of the separation tank C1, there is an overflow interface three C12. On the side of the separation tank C1, there are connected an incoming water main pipe C13 and an outgoing water main pipe C14, which are respectively connected to the ring-shaped water distribution pipe C6 and the ring-shaped water collecting pipe C7. At the bottom of the separation tank C1, there is a concentrated mortar discharge port C15. The concentrated mortar discharge port C15 is connected to a mortar discharge pipe two C16, and the mortar discharge pipe two C16 is connected to a solenoid valve two C17.

[0059] The middle and lower parts of the ring-shaped water distribution pipe C6 are provided with water distribution small holes C6-1, which are arranged in a plum blossom shape. The ring-shaped water distribution pipe C6 is fixed on the inner wall of the downward outer cavity C3 through a water distribution pipe hoop C6-2. The middle and upper parts of the ring-shaped water collecting pipe C7 are provided with water collecting small holes C7-1, which are arranged in a plum blossom shape. The water collecting small holes C7-1 are fixed on the inner wall of the upward inner cavity C4 through a water collecting pipe hoop C7-2.

[0060] Specifically, the design purpose of the precipitation and separation unit is to separate the solid and liquid in the mixed mortar through an efficient solid-liquid separation process to obtain a primary calcium chloride solution and concentrated mortar.

[0061] Inside the separation tank C1, there is an inverted annular baffle C2, which divides the interior of the tank into a downward outer cavity C3 and an upward inner cavity C4. At the top of the inverted annular baffle C2, there is an exhaust pressure balance hole C5, which is used to adjust the air pressure balance inside the cavity to ensure the smooth flow of the slurry. The design of the annular baffle C2 enables the slurry to form an up-and-down flow path in the tank, facilitating solid-liquid separation.

[0062] At the upper part of the inner wall of the downward outer cavity C3, there is a circular water distribution pipe C6 hanging on the wall. This water distribution pipe is fixed to the inner wall of the downward outer cavity C3 through a water distribution pipe clamp C6-2. In the middle and lower parts of the circular water distribution pipe C6, there are multiple water distribution holes C6-1, which are arranged in a plum blossom shape to ensure that the slurry can be evenly distributed in the downward outer cavity C3, thereby optimizing the precipitation effect.

[0063] At the upper part of the inner wall of the upward inner cavity C4, there is a circular water collection pipe C7 hanging on the wall. The water collection pipe is fixed to the inner wall of the upward inner cavity C4 through a water collection pipe clamp C7-2. In the middle and upper parts of the water collection pipe C7, there are multiple water collection holes C7-1, which are also arranged in a plum blossom shape and are used to collect the separated primary calcium chloride solution and introduce it into the outlet main pipe C14.

[0064] The middle area of the separation tank C1 is a silt-promoting sedimentation packing area C8. The packing design in this area further enhances the sedimentation efficiency of solid particles in the slurry. In this area, the solid particles gradually settle to the bottom of the tank, while the liquid rises to the upward inner cavity C4 and is finally collected through the water collection pipe C7.

[0065] At the top of the separation tank C1, there is a maintenance manhole C9 for the daily maintenance and repair of the equipment. There is also a discharge hole C10 at the top, which is convenient for discharging the precipitated solid waste, and an exhaust gas outlet C11 for discharging the gas generated during the separation process. The gas enters the exhaust gas treatment system through this outlet.

[0066] On the side of the separation tank C1, there is an overflow interface C12 to prevent the liquid from overflowing when the slurry is excessive. There is also an inlet main pipe C13 and an outlet main pipe C14 connected to the side of the tank. The inlet main pipe C13 is connected to the circular water distribution pipe C6 to introduce the mixed mortar into the tank, and the outlet main pipe C14 is connected to the circular water collection pipe C7 to transport the collected calcium chloride solution to the subsequent treatment unit.

[0067] At the bottom of the separation tank C1, there is a concentrated mortar discharge port C15, which is connected to a mortar discharge pipe C16. An electromagnetic valve C17 is installed on the discharge pipe to control the discharge of the concentrated mortar. The separated concentrated mortar is transported through the discharge pipe C16 to the next treatment unit for further treatment or final disposal.

[0068] The mixed mortar prepared in the dissolution-promoting reaction unit is pumped into the separation tank C1 through the water inlet main pipe C13, and then the mixed mortar is evenly introduced into the descending outer cavity C3 through the water distribution holes of the annular water distribution pipe C6. The mixed mortar first descends, rises after passing through the inverted annular guide plate C2, and then passes through the sediment-promoting settling filler area C8. In this process, the characteristics that fly ash itself is easy to settle are utilized to complete the solid-liquid separation of the mixed mortar. The separated primary calcium chloride solution enters through the water collection holes on the annular water collection pipe C7, and then flows by gravity through the water outlet main pipe C14 to the subsequent quality control unit. The concentrated mortar flows by gravity through the concentrated mortar discharge port C15 and the mortar discharge pipe 2 C16 to the subsequent receiving unit under the control of the solenoid valve 2 C17. In this process, the waste gas 3 in the separation tank C1 is discharged through the waste gas discharge port 3 C11 and enters the waste gas treatment system for treatment;

[0069] The separated primary calcium chloride solution is introduced into the weight removal unit for weight removal treatment. The supernatant after weight removal is transported to the storage tank of the quality control unit. Under the control of the detection module and the purification module of the quality control unit, the effective component of the calcium chloride solution is adjusted to 20%-25%. Finally, the calcium chloride solution is canned and sold as a finished product. The precipitated sludge after weight removal is pumped to the wastewater treatment unit for treatment, and the waste gas 4 generated during the weight removal process is treated by the waste gas treatment system.

[0070] Please refer to the appendix Figure 6 The water washing unit includes a water washing tank D1. The top of the water washing tank D1 is provided with a mortar inlet 2 D4, a water inlet 5 D5, a water inlet 6 D6, a maintenance manhole 4 D7 and a waste gas discharge port 4 D8. The side of the water washing tank D1 is provided with an overflow interface 4 D9 and a mortar discharge port 3 D10. The bottom of the water washing tank D1 is provided with an emptying interface 2 D11. The mortar inlet 2 D4, the water inlet 5 D5 and the water inlet 6 D6 are respectively connected with a pipeline flowmeter 4 D12, a pipeline flowmeter 5 D13 and a pipeline flowmeter 6 D14. The mortar discharge port 3 D10 is connected with a mortar discharge pipe 3 D15. The mortar discharge pipe 3 D15 is connected with a variable frequency booster pump 3 D16. The top of the water washing tank D1 is installed with a liquid level controller 3 D3 and a top drive stirrer 2 D2.

[0071] Specifically, the design of the water washing unit aims to further remove chloride ions in the fly ash through a sufficient water washing process, thereby improving the purification effect of the fly ash. This unit consists of a water washing tank D1 and its related inlet and outlet pipelines, a flow control system and a stirring device.

[0072] Inside the water washing tank D1, a liquid level controller D3 is installed. This controller monitors the liquid level in the water washing tank D1 in real time and transmits the data to the control system to adjust the amount of incoming and outgoing liquid, ensuring stability during the water washing process. At the same time, a top-driven agitator D2 is also installed in the tank. Through the action of the agitator, it ensures that the mortar and water are fully mixed in the tank, improving the efficiency of water washing and enabling the full elution of chloride ions from the fly ash.

[0073] On the side of the water washing tank D1, there is an overflow interface D9, which is used to discharge excess liquid when the liquid level is too high during the water washing process, preventing liquid overflow from affecting the system operation. In addition, the mortar discharge port D10 on the side is connected to the mortar discharge pipe D15. Through this discharge pipe and the variable-frequency booster pump D16, the mortar after water washing is transported to the next processing unit - the eddy current separation unit for further separation processing.

[0074] To facilitate the maintenance and operation of the system, a maintenance manhole D7 is also provided at the top of the water washing tank D1, allowing operators to enter the tank for inspection or maintenance. The drain interface D11 at the bottom is used to drain the liquid in the tank when necessary, facilitating cleaning or maintenance.

[0075] During the entire water washing process, the exhaust gas outlet D8 is used to discharge the exhaust gas generated during the washing process. These exhaust gases will be introduced into the exhaust gas treatment system for treatment to ensure that the discharged gases meet environmental protection requirements.

[0076] The concentrated mortar separated by the precipitation separation unit is introduced into the water washing tank D1 through the fly ash inlet, and the filtrate from the mechanical solid-liquid separation unit is continuously pumped into the water washing tank D1 through the incoming water inlet 1. By jointly reading the data of the pipeline flowmeter, the amount of the washing liquid after mechanical solid-liquid separation pumped in is accurately controlled, and the mass ratio of the total incoming water to the concentrated mortar is controlled at 1.0 - 1.5. During this process, the exhaust gas 6 in the water washing tank D1 is discharged through the exhaust gas outlet and enters the exhaust gas treatment system for treatment. After 45 - 90 minutes of stirring and water washing, the primary water-washed mortar is obtained. After passing through the mortar discharge port D10 and the mortar discharge pipe D15, it is transported to the primary eddy current separation unit by the variable-frequency booster pump D16.

[0077] The primary concentrated mortar and clean makeup water after being processed by the primary eddy current separation unit are introduced into the water washing tank D1 of the secondary water washing unit, and by controlling the amount of the introduced clean makeup water, the mass ratio of the total incoming water to the concentrated mortar is adjusted to be controlled at 0.5 - 1.0. After 45 - 90 minutes of stirring and water washing, the secondary water-washed mortar is obtained, and the exhaust gas 8 generated during this period is treated by the exhaust gas treatment system.

[0078] Respectively introduce the above-mentioned primary concentrated mortar and clean make-up water into the water-washing tank of the secondary water-washing unit, and by controlling the amount of clean make-up water introduced, adjust the mass ratio of the total incoming water to the concentrated mortar to be controlled within 0.5 - 1.0; after stirring and water-washing for 45 - 90 minutes, the secondary water-washed mortar is prepared, and the waste gas 8 generated during this period is treated by the waste gas treatment system.

[0079] The mechanical solid-liquid separation unit separates the secondary water-washed mortar into filtrate and solid residue. The filtrate is all returned as make-up water for the primary water-washing unit for treatment. The solid residue can reach dechlorinated fly ash with a chlorine content ≤ 2% and a moisture content of 30 - 50%. Thus, energy-saving and efficient fly ash dechlorination is completed, and it can be outsourced for further terminal disposal.

[0080] Please refer to the attached Figure 7 - attached Figure 8 , the vortex separation unit includes a washing liquid storage tank E1 and a concentrated mortar storage tank E2. Externally, several groups of vortex separators E3 are connected between the washing liquid storage tank E1 and the concentrated mortar storage tank E2, and they are connected by an ash discharge pipe E4 at their central axes. The top of the washing liquid storage tank E1 is provided with an exhaust port five E5 and a maintenance manhole five E6. The upper part is provided with a washing liquid discharge port E7, which is connected to a washing liquid discharge pipe E8. The bottom of the washing liquid storage tank E1 is provided with an ash discharge port E9, and the ash discharge port E9 is connected to an ash discharge pipe E4. An electromagnetic valve three E10 is provided on the ash discharge pipe E4. The bottom of the ash discharge pipe E4 is connected to the concentrated mortar storage tank E2. The bottom of the concentrated mortar storage tank E2 is provided with a mortar discharge port four E11, and the mortar discharge port four E11 is connected to a mortar discharge pipe four E12. The mortar discharge pipe four E12 is connected to an electromagnetic valve four E13.

[0081] The side upper part of the vortex separator E3 is provided with a water-washed mortar access pipe E3-1, and its top is provided with a connecting conduit E3-2. The connecting conduit E3-2 is connected to the washing liquid storage tank E1. The bottom of the connecting conduit E3-2 is provided with an inverted conical pipe E3-3, and the inverted conical pipe E3-3 is connected to the concentrated mortar storage tank E2. The upper parts of several vortex separators E3 are connected to an annular access main pipe E3-4. The annular access main pipe E3-4 is connected to an electromagnetic valve five E3-5 and a variable-frequency slurry pump E3-6.

[0082] Specifically, the vortex separation unit realizes the three-phase separation of the water-washed mortar, namely solid phase, liquid phase and gas phase, thereby further improving the efficiency and effect of fly ash resource treatment.

[0083] The washing liquid storage tank E1 and the concentrated mortar storage tank E2 are the two core tanks of the vortex separation unit. The top of the washing liquid storage tank E1 is provided with an exhaust port five E5 for discharging the gas generated during the vortex separation process, ensuring the air pressure balance in the tank and preventing excessive gas accumulation from affecting the separation effect. In addition, the washing liquid storage tank E1 is also provided with a maintenance manhole five E6, which is convenient for operators to carry out internal maintenance and repair.

[0084] The upper part of the washing liquid storage tank E1 is provided with a washing liquid discharge port E7, which is connected through a washing liquid discharge pipe E8 and is used to collect and transport the separated clear liquid. The bottom of the storage tank is provided with an ash discharge port E9, which is connected to an ash discharge pipe E4 and is connected to the concentrated ash slurry storage tank E2 through this pipe. A solenoid valve three E10 is installed on the ash discharge pipe E4 to control the discharge of the concentrated ash slurry. The solenoid valve three E10 is intermittently opened to ensure that the concentrated ash slurry flows into the concentrated ash slurry storage tank E2 at the best time.

[0085] The eddy current separator E3 is located between the washing liquid storage tank E1 and the concentrated ash slurry storage tank E2, and an efficient separation system is formed through a combination of several groups of separators. The upper part of the side of the eddy current separator E3 is provided with a water-washed ash slurry access pipe E3-1, which is used to introduce the ash slurry from the water washing unit into the separator. The top of the separator is provided with a connecting conduit E3-2, which is connected to the washing liquid storage tank E1 and is used to introduce the separated clear liquid and gas into the storage tank. The bottom of the separator is provided with an inverted conical pipe E3-3, which is connected to the concentrated ash slurry storage tank E2 and is used to collect the separated concentrated ash slurry.

[0086] Several groups of inverted conical pipes E3-3 are connected to an annular access main pipe E3-4, and this main pipe is connected to other separator systems through a solenoid valve five E3-5 and a variable-frequency slurry pump E3-6. The variable-frequency slurry pump E3-6 is used to adjust the flow rate of the slurry and the eddy current intensity in the eddy current separator E3, so as to optimize the separation effect and ensure that the flow state of the slurry in the separator reaches the best.

[0087] The concentrated ash slurry storage tank E2 is a collection container for the separated ash slurry. The bottom of it is provided with a slurry discharge port four E11, which is connected to a solenoid valve four E13 through a slurry discharge pipe four E12 and is used to control the discharge of the final concentrated ash slurry to ensure that the ash slurry can be safely and effectively transported to the subsequent treatment unit or final disposal after treatment.

[0088] The first-stage water-washed ash slurry is evenly distributed to several groups of eddy current separators E3 through the annular access main pipe E3-4 for three-phase efficient separation, and the eddy current intensity in the eddy current separator E3 is controlled by adjusting the pressure of the variable-frequency booster pump; the separated upward clear liquid and air are introduced into the washing liquid storage tank E1 through the connecting conduit E3-2, and the separated downward concentrated ash slurry is introduced into the concentrated ash slurry storage tank E2 through the inverted conical pipe; the waste gas 7 introduced into the washing liquid storage tank E1 is discharged through the waste gas discharge port and enters the waste gas treatment system for treatment; the separated first-stage washing liquid, after passing through the washing liquid discharge port E7 and the washing liquid discharge pipe E8, is all pumped by the variable-frequency booster pump to the pulping unit for use as a pre-solution; the separated first-stage concentrated ash slurry, through the slurry discharge port four E11 and the slurry discharge pipe four E12, flows by gravity to the subsequent second-stage water washing unit, and its flow rate is controlled by the solenoid valve four E13; the ash slurry deposited in the washing liquid storage tank E1, through the ash discharge port E9 and the ash discharge pipe E4, is regularly discharged into the concentrated ash slurry storage tank E2 by the solenoid valve four E13, and the discharge interval time is 6 - 48h.

[0089] Working principle: When the system is in use, first, the raw fly ash is weighed by the weighing scale system A15 and fed into the pulping tank A1 through the fly ash inlet A4, and is mixed with the washing liquid from the eddy current separation unit and the reclaimed water treated by the wastewater treatment unit in proportion. The liquid level is monitored by the liquid level controller A3, and the speed control controller A16 adjusts the top drive variable frequency stirrer A2 to ensure uniform mixing and form a pre-dissolved primary pulp. The waste gas enters the waste gas treatment system through the waste gas discharge port A8. The pre-dissolved primary pulp is transported to the solubilization reaction unit by the variable frequency booster pump A18 through the mortar discharge port A10 and the primary pulp discharge pipe A17. The pre-dissolved primary pulp enters the reaction tank B1 through the mortar inlet B5, and under the adjustment of the pH controller B4 and the solvent promoter adjustment module B13, the solvent promoter and the regulator are added to maintain the pH value in the reaction tank at 8-10. During the stirring process, calcium salts and chloride salts are dissolved to form calcium chloride solution. The waste gas is discharged through the waste gas discharge port B9 for treatment. After the reaction is completed, the mixed mortar is transported to the precipitation separation unit through the mortar discharge port B11 and the mortar discharge pipe B14. The mixed mortar enters the separation tank C1 through the total water inlet pipe C13, and solid-liquid separation is carried out through the sedimentation filler area C8 in the downward outer cavity C3 and the upward inner cavity C4. The primary calcium chloride solution enters the outlet main pipe C14 through the water collecting hole C7-1 and flows to the quality control unit. The concentrated mortar is controlled by the solenoid valve C17 through the concentrated mortar discharge port C15 and the mortar discharge pipe C16 to flow to the subsequent receiving unit. The waste gas enters the waste gas treatment system through the waste gas discharge port C11. The primary calcium chloride solution enters the deweighting unit, and the supernatant after treatment is transported to the temporary storage tank of the quality control unit, and is detected and purified to a concentration of 20%-25% and then canned for sale. The sediment sludge after deweighting is transported to the wastewater treatment unit, and the waste gas is treated by the waste gas treatment system. The concentrated mortar enters the washing tank D1 through the mortar inlet D4, the filtrate of the mechanical solid-liquid separation unit is added, and the water volume is adjusted by the liquid level controller and the flow meter to ensure sufficient washing of the mortar. The waste gas is treated through the waste gas discharge port D8. After washing, the first-stage washed mortar is transported to the eddy current separation unit by the variable frequency booster pump D16 through the mortar discharge port D10 and the mortar discharge pipe D15. The first-stage washed mortar enters the eddy current separator E3 through the annular access main pipe E3-4 for three-phase separation. The separated clear liquid is introduced into the washing liquid storage tank E1 through the connecting conduit E3-2, and the concentrated mortar enters the concentrated mortar storage tank E2 through the inverted conical pipe E3-3. The separated waste gas is transported to the waste gas treatment unit through the waste gas discharge port E5. The clear liquid is recycled to the fly ash pulping unit, and the concentrated mortar enters the second-stage washing unit. The first-stage concentrated mortar is mixed with the supplementary water and enters the second-stage washing tank, and after adjusting the water-cement ratio by adjusting the amount of the supplementary water, further dechlorination is carried out, and the waste gas is treated by the waste gas treatment system. The second-stage washed mortar is separated into filtrate and solid residue in the mechanical solid-liquid separation unit. The filtrate is returned to the first-stage washing unit as supplementary water, and the solid residue meets the dechlorination requirements and is treated as the final dechlorinated fly ash. The waste gas treatment unit centrally treats the waste gas generated by each unit of the system through the waste gas collection main pipe, and the emission meets the standards.The wastewater treatment unit receives the precipitated sludge from the heavy metal removal unit and the wastewater from the waste gas treatment unit. After treatment, the reclaimed water is recycled to the pulping unit, and the dewatered sludge is entrusted to external parties for proper treatment.

[0090] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for resource utilization of fly ash with a short link, characterized in that, It includes a fly ash pulping unit and an exhaust gas treatment unit. The fly ash pulping unit is used to mix fly ash and water in proportion to form a uniform slurry, which is connected to a solubilization reaction unit through a primary pulp discharge pipe (A17). The solubilization reaction unit is used to adjust the pH value of the slurry and promote the dissolution of calcium salts and chloride salts. It is connected to a precipitation separation unit through a pulp discharge pipe one (B14) for solid-liquid separation to obtain a primary calcium chloride solution and concentrated ash slurry. The separated calcium chloride solution is sent to a quality control unit after being treated by a weight removal unit, and the precipitated sludge is transported to a wastewater treatment unit. The concentrated ash slurry enters a multi-stage water washing unit through a pulp discharge pipe two (C16). The multi-stage water washing unit is used for further dechlorination. The slurry after water washing in the multi-stage water washing unit enters a vortex separation unit through a pulp discharge pipe three (D15). The vortex separation unit is used for three-phase separation. The separated clear liquid is recycled to the fly ash pulping unit. The concentrated ash slurry first undergoes secondary water washing and then enters a mechanical solid-liquid separation unit. The mechanical solid-liquid separation unit is used for final solid-liquid separation to obtain filtrate and solid residue. The filtrate is refluxed to the water washing unit, and the solid residue is finally dechlorinated fly ash. The exhaust gas treatment unit is connected to the exhaust gas discharge ports of all units through an exhaust gas collection main pipe and is discharged after treatment.

2. The system for resource utilization of fly ash with a short link according to claim 1, characterized in that The fly ash pulping unit includes a pulping tank (A1) and a liquid level controller one (A3). The top of the pulping tank (A1) is provided with a fly ash inlet (A4), a water inlet one (A5), a water inlet two (A6), a maintenance manhole one (A7) and an exhaust gas outlet one (A8). The side of the pulping tank (A1) is provided with an overflow interface one (A9) and a pulp discharge port one (A10). The bottom of the pulping tank (A1) is provided with an emptying interface one (A11). The water inlet one (A5) is connected with a pipeline flowmeter one (A12) and a solenoid valve one (A13). The water inlet two (A6) is connected with a pipeline flowmeter two (A14). The fly ash inlet (A4) is connected with a weighing scale system (A15). The liquid level controller one (A3) reads the liquid level signal in the pulping tank (A1) and transmits the signal to a speed control controller (A16). A top drive variable frequency stirrer (A2) is installed on the top of the pulping tank (A1). The pulp discharge port one (A10) is connected with a primary pulp discharge pipe (A17). The primary pulp discharge pipe (A17) is connected with a variable frequency booster pump one (A18) for transporting the prepared primary pulp to the subsequent solubilization reaction unit.

3. A system for resource utilization of fly ash with a short link according to claim 1, characterized in that, The dissolution-promoting reaction unit includes a reaction tank (B1) and a pH controller (B4). The top of the reaction tank (B1) is provided with a first mortar inlet (B5), a third water inlet (B6), a fourth water inlet (B7), a second maintenance manhole (B8), and a second exhaust port (B9). The side of the reaction tank (B1) is provided with a second overflow interface (B10). The bottom of the reaction tank (B1) is provided with a second mortar discharge port (B11). The first mortar inlet (B5) is connected to a third pipeline flowmeter (B12). The third water inlet (B6), the fourth water inlet (B7), and the pH controller (B4) are all connected to a dissolution-promoting agent adjustment module (B13) for controlling the operation rate of the overall reaction tank (B1). The second mortar discharge port (B11) is connected to a first mortar discharge pipe (B14). The first mortar discharge pipe (B14) is connected to a second variable-frequency booster pump (B15). A second liquid level controller (B3) is installed at the top of the reaction tank (B1). A first top-driven stirrer (B2) is installed at the top of the reaction tank (B1).

4. A system for resource utilization of fly ash with a short link according to claim 1, characterized in that, The precipitation separation unit includes a separation tank (C1). An inverted ring-shaped guide plate (C2) is arranged inside the separation tank (C1), which divides the inner volume of the separation tank (C1) into a downward outer cavity (C3) and an upward inner cavity (C4). An exhaust pressure balance hole (C5) is arranged at the top of the inverted ring-shaped guide plate (C2). A ring-shaped water distribution pipe (C6) is arranged in a circle on the inner wall of the upper part of the downward outer cavity (C3). A ring-shaped water collecting pipe (C7) is arranged in a circle on the inner wall of the upper part of the upward inner cavity (C4). The middle part of the separation tank (C1) is a sedimentation-promoting filler area (C8). The top of the separation tank (C1) is provided with a third maintenance manhole (C9), a discharge hole (C10), and a third exhaust port (C11). The side of the separation tank (C1) is provided with a third overflow interface (C12). The side of the separation tank (C1) is connected with a total water inlet pipe (C13) and a total water outlet pipe (C14), which are respectively connected to the ring-shaped water distribution pipe (C6) and the ring-shaped water collecting pipe (C7). A concentrated mortar discharge port (C15) is arranged at the bottom of the separation tank (C1). The concentrated mortar discharge port (C15) is connected to a second mortar discharge pipe (C16). The second mortar discharge pipe (C16) is connected to a second solenoid valve (C17).

5. A short-link fly ash resource utilization system according to claim 4, characterized in that, Water distribution small holes (C6-1) are arranged in the middle and lower parts of the ring-shaped water distribution pipe (C6), which are arranged in a plum blossom shape. The ring-shaped water distribution pipe (C6) is fixed on the inner wall of the downward outer cavity (C3) through a water distribution pipe hoop (C6-2). Water collecting small holes (C7-1) are arranged in the middle and upper parts of the ring-shaped water collecting pipe (C7), which are arranged in a plum blossom shape. The water collecting small holes (C7-1) are fixed on the inner wall of the upward inner cavity (C4) through a water collecting pipe hoop (C7-2).

6. A short-link fly ash resource utilization system according to claim 1, characterized in that, The water washing unit includes a water washing tank (D1). The top of the water washing tank (D1) is provided with a second mortar inlet (D4), a fifth water inlet (D5), a sixth water inlet (D6), a fourth maintenance manhole (D7) and a fourth waste gas discharge port (D8). The side of the water washing tank (D1) is provided with a fourth overflow interface (D9) and a third mortar discharge port (D10). The bottom of the water washing tank (D1) is provided with a second emptying interface (D11). The second mortar inlet (D4), the fifth water inlet (D5) and the sixth water inlet (D6) are respectively connected with a fourth pipeline flowmeter (D12), a fifth pipeline flowmeter (D13) and a sixth pipeline flowmeter (D14). The third mortar discharge port (D10) is connected with a third mortar discharge pipe (D15). The third mortar discharge pipe (D15) is connected with a third variable frequency booster pump (D16). A third liquid level controller (D3) and a second top drive stirrer (D2) are installed on the top of the water washing tank (D1).

7. A short-link fly ash resource utilization system according to claim 1, characterized in that, The eddy current separation unit includes a washing liquid storage tank (E1) and a concentrated mortar storage tank (E2). The outside of the washing liquid storage tank (E1) and the concentrated mortar storage tank (E2) is connected by several groups of eddy current separators (E3), and the center axis is connected by an ash discharge pipe (E4). The top of the washing liquid storage tank (E1) is provided with a fifth waste gas discharge port (E5) and a fifth maintenance manhole (E6). The upper part thereof is provided with a washing liquid discharge port (E7), which is connected with a washing liquid discharge pipe (E8). The bottom of the washing liquid storage tank (E1) is provided with an ash outlet (E9). The ash outlet (E9) is connected with the ash discharge pipe (E4). A third solenoid valve (E10) is arranged on the ash discharge pipe (E4). The bottom of the ash discharge pipe (E4) is connected with the concentrated mortar storage tank (E2). The bottom of the concentrated mortar storage tank (E2) is provided with a fourth mortar discharge port (E11). The fourth mortar discharge port (E11) is connected with a fourth mortar discharge pipe (E12). The fourth mortar discharge pipe (E12) is connected with a fourth solenoid valve (E13).

8. A short-link fly ash resource utilization system according to claim 7, characterized in that, The upper side of the eddy current separator (E3) is provided with a water-washed mortar access pipe (E3-1). The top thereof is provided with a connecting conduit (E3-2). The connecting conduit (E3-2) is connected with the washing liquid storage tank (E1). A conical pipe (E3-3) is arranged at the bottom of the connecting conduit (E3-2). The conical pipe (E3-3) is connected with the concentrated mortar storage tank (E2). The upper parts of several eddy current separators (E3) are connected with an annular access main pipe (E3-4). The annular access main pipe (E3-4) is connected with a fifth solenoid valve (E3-5) and a variable frequency slurry pump (E3-6).

9. A system for resource utilization of fly ash with a short link according to claim 1, characterized in that, The mechanical solid-liquid separation unit includes a mechanical separation module and a filtrate buffer tank. The weight removal unit includes a reaction module and a weight removal sedimentation tank. The product quality control unit includes a detection module, a purification module and three primary calcium chloride temporary storage tanks. The waste gas treatment unit includes a waste gas treatment module and a waste gas emission module. The waste water treatment unit includes a waste water treatment module and a reclaimed water tank.

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