Geothermal tail water multi-stage heat energy recovery treatment system

Abstract

The present application relates to geothermal tail water heat energy recovery technical field, especially to a kind of geothermal tail water multistage heat energy recovery processing system, including, high temperature level directional crystallization induced module, to induce the directional generation target crystallite of carbonate scale in tail water;Interstage crystal grain capture sorting module, to intercept microcrystal and be sorted into reflux crystal seed and cross-level crystal seed;Crystal seed surface directional modification module, to build directional anchoring site on the surface of cross-level crystal seed;Middle temperature level coating growth induced module, to induce the growth of siliceous scale on the surface of modified crystal seed, form core-shell structure microcrystal.The present application breaks through the technical prejudice of " calcium-silicon scale mixed easily aggravate compound scale formation " in the field by constructing carbonate core-shell structure microcrystal-siliceous shell;Siliceous shell passivates carbonate microcrystal surface activity, substantially reduces its agglomeration and wall adhesion tendency;Carbonate core provides directional heterogeneous nucleation carrier for siliceous scale, avoids high adhesion silicagel spontaneous deposition on wall.

Description

Technical Field

[0001] This invention relates to the field of geothermal tailwater heat energy recovery technology, and in particular to a multi-stage geothermal tailwater heat energy recovery and treatment system. Background Technology

[0002] Geothermal energy, as a clean and stable renewable energy source with abundant reserves, is one of the core technological pathways for achieving carbon reduction goals in the fields of building domestic hot water and district heating. Geothermal hot water is the main carrier of geothermal energy, usually referring to geothermal water with a temperature range of 40-90℃ extracted from medium-deep geothermal reservoirs, as well as geothermal tailwater after cascade heat exchange. Such water bodies generally contain a variety of dissolved mineral components such as calcium ions, carbonate ions, and silicates. Among them, calcium carbonate and amorphous silica are the most typical scale-forming substances in the geothermal cascade heat exchange process. The industry usually adopts a multi-stage cascade heat exchange method to extract heat energy from geothermal water step by step to meet the heat demand of different grades in sequence, so as to maximize the utilization efficiency of geothermal resources.

[0003] Chinese Patent Publication No. CN121854922A discloses a multi-energy year-round hot water supply system method primarily utilizing deep and shallow geothermal energy. The system includes a hot water storage tank, a hot water circulation pump, a water-to-water plate heat exchanger, a heat recovery ground source heat pump unit, an air source hot water unit, and three jog-operated valves. The primary side of the plate heat exchanger is connected to the medium-deep geothermal water supply pipeline and the tailwater pipeline. The hot water side is connected in parallel to the secondary side of the plate heat exchanger, the heat recovery unit, and the air source unit via a distribution pipeline from the hot water storage tank, and then returns to the source. The controller determines the optimal operating mode based on seasonal operating conditions, interlocks and opens the corresponding valves to drive the hot water through the target path for heat exchange / heating. When the temperature in the hot water storage tank falls below a preset threshold, it switches to the backup path for compensatory heating. This system achieves multi-energy synergy and tailwater cascade utilization, ensuring stable water supply temperature and continuous year-round supply, reducing energy consumption and maintenance costs, and improving system integration and reliability.

[0004] Therefore, the existing technology still has the following problems: In the multi-stage heat exchange process of geothermal water, the water temperature decreases step by step, and the dissolved minerals in the water reach a supersaturated state one after another: In the high-temperature heat exchange section, due to pressure and temperature changes, calcium carbonate is easy to precipitate and form crystalline hard scale; In the medium and low temperature heat exchange section, the solubility of silica decreases sharply with the decrease of temperature, and the monomer silica undergoes a polymerization reaction to form amorphous silica scale with strong adhesion. The scale layer continuously adheres to the heat exchanger wall, which will significantly increase the heat exchange thermal resistance, reduce the heat recovery efficiency, and increase the flow resistance of the pipeline. In severe cases, it may even cause flow channel blockage, forcing the system to shut down frequently for cleaning. Summary of the Invention

[0005] To address this issue, the present invention provides a multi-stage heat recovery treatment system for geothermal tailwater, which overcomes the problem in the prior art where scale continuously adheres to the heat exchanger wall, significantly increasing heat exchange resistance, reducing heat recovery efficiency, increasing pipeline flow resistance, and even causing flow channel blockage in severe cases, forcing the system to shut down frequently for cleaning.

[0006] To achieve the above objectives, the present invention provides a multi-stage heat recovery and treatment system for geothermal tailwater, comprising: High-temperature stage heat exchange unit and medium-temperature stage heat exchange unit are arranged sequentially along the tailwater flow direction; A high-temperature directional crystallization induction module is used to induce carbonate scale in effluent to form suspended target crystal microcrystals. The interstage grain capture and sorting module is used to intercept the suspended microcrystals flowing out from upstream and sort them into reflux seeds and cross-stage seeds according to crystal form and growth state; The seed surface orientation modification module is used to construct directional anchoring points on the surface of cross-level seed crystals that match the next level of dominant seed crystals, thereby generating modified seed crystals with directional nucleation induction capabilities. The intermediate-temperature coating growth induction module is used to receive the modified seed crystals and tailwater, and induce the silicon scale precipitated at the intermediate temperature to grow in an orderly manner on the surface of the modified seed crystals, forming a core-shell structured suspended microcrystals. The local intelligent control module has a built-in coating coupling precipitation kinetic model, which is used to coordinate and regulate the operating parameters of the high-temperature stage directional crystallization induction module, the interstage grain capture and sorting module, the seed surface directional modification module and the medium-temperature stage coating growth induction module according to real-time water quality parameters and seed property data, so that the microcrystal growth process matches the heat exchange temperature zone of the corresponding stage. The thermodynamic control module is used to adjust the heat exchange operating parameters according to the instructions of the local intelligent control module, and to shift the supersaturated scale precipitation range to the non-heat exchange section downstream of the heat exchange unit.

[0007] Furthermore, the high-temperature directional crystallization induction module includes a multi-parameter detection submodule, a multi-mode action submodule, and a timing control submodule; The multi-mode action submodule integrates an electromagnetic field generating component and an ultrasonic generating component. The timing control submodule is used to control the electromagnetic field generating component and the ultrasonic generating component to operate step by step according to a preset timing sequence, inducing carbonate scale to form aragonite-type microcrystals in a directional manner and maintaining their suspension.

[0008] Furthermore, the interstage grain capture and sorting module includes a solid-liquid separation submodule, a grain detection submodule, and a sorting execution submodule; The grain detection submodule is used to detect the crystal form, grain size and coating integrity of the microcrystals; Based on the detection results, the sorting execution submodule returns microcrystals that do not meet the growth requirements to the high-temperature directional crystallization induction module, and transports microcrystals that meet the cross-level requirements to the seed surface directional modification module.

[0009] Furthermore, the seed crystal surface orientation modification module includes a surface activation submodule and a surface functionalization grafting submodule; The surface activation submodule is used to pre-treat the surface of the cross-level seed crystals; The surface functionalized grafting submodule is used to graft functional groups that have a specific adsorption effect on silicon scale molecules onto the surface of the seed crystal to form the directional anchoring point.

[0010] Furthermore, the intermediate-temperature coating growth induction module includes a depolymerization and activation submodule, a growth regulation submodule, and a suspension stabilization submodule; The depolymerization and activation submodule is used to break down long-chain silica polymers in water and release the monomer silica required for coating growth. The growth control submodule is used to induce the preferential growth of silicon components on the surface of the modified seed crystals; The suspension stabilization submodule is used to regulate the surface charge of the core-shell microcrystals.

[0011] Furthermore, it also includes, Anti-adhesion modules for heat exchange walls are respectively installed on the inner wall surfaces of each heat exchange unit; The inner wall of the high-temperature heat exchange unit adopts a biomimetic microgroove structure, while the inner wall of the medium-temperature heat exchange unit adopts a hydrophobic coating structure.

[0012] Furthermore, based on the scale load prediction results output by the local intelligent control module, the thermodynamic control module adjusts the evaporation temperature or heat flux density of the heat exchange unit to constrain the starting position of scale supersaturation precipitation to the non-heat exchange pipe section downstream of the outlet of the corresponding heat exchange unit; wherein the non-heat exchange pipe section corresponding to the high-temperature stage heat exchange unit is the pipe section between its outlet and the inlet of the interstage grain capture and sorting module, and the non-heat exchange pipe section corresponding to the medium-temperature stage heat exchange unit is the pipe section between its outlet and the inlet of the deep treatment unit.

[0013] Furthermore, the local intelligent control module includes a data receiving submodule, a deviation comparison submodule, and a parameter correction submodule; The data receiving submodule is used to collect detection data at all levels and feedback data from downstream modules; The deviation comparison submodule is used to compare the actual running results with the predicted values ​​of the encapsulation coupling precipitation dynamics model; The parameter correction submodule is used to orient and correct model parameters based on the comparison deviation.

[0014] Furthermore, it also includes a global collaborative control module, which communicates and connects with the local intelligent control module; The global collaborative control module is used to aggregate the system's operational data and model deviation data, optimize and update the global dynamic parameters of the encapsulated coupling dynamic model, and send the updated parameters to the local intelligent control module to achieve the model's self-evolution.

[0015] Furthermore, a deep treatment unit is installed at the end of the tailwater flow direction; The local intelligent control module adjusts the final particle size and concentration of core-shell structured microcrystals according to the pollution prevention requirements of the influent to the deep treatment unit, so that the quality of the effluent entering the deep treatment unit matches the requirements of the end-of-pipe process.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention actively constructs a core-shell structure microcrystal of carbonate core-silica shell, breaking through the common technical prejudice in the field that "the mixing of calcium and silicon scale easily aggravates complex scaling"; the silica shell passivates the surface activity of carbonate microcrystals, greatly reducing their tendency to agglomerate and adhere to the wall surface; the carbonate core provides a directional heterogeneous nucleation carrier for silica scale, avoiding the spontaneous deposition of highly adhesive silica gel on the wall surface. The two work synergistically to enhance the scaling effect, which is significantly better than the simple superposition of traditional two-stage independent scaling solutions, and the scaling rate of the heat exchange surface is greatly reduced.

[0017] Furthermore, the carbonate microcrystals generated in the high-temperature section are sorted and then used for graded resource utilization: a portion is returned to the same stage to enhance bulk nucleation, reducing the amount of external seed crystals and scale inhibitors added; another portion is modified and used as nucleation seed crystals for silica scale in the medium-temperature section, transforming upstream by-products into downstream functional raw materials without the need for additional silica scale-inducing seed crystals, while reducing solid waste discharge and significantly reducing the system's material consumption and long-term operating costs.

[0018] Furthermore, based on the global coordinated regulation of the coating coupling precipitation kinetic model, the nucleation rate and growth process of microcrystals are precisely matched with the heat exchange temperature zones at each level. This ensures the scale inhibition effect while avoiding heat exchange efficiency loss caused by excessive scale inhibition intervention. Combined with the adaptable anti-adhesion structure of the heat exchange wall at each level, it works synergistically from the two dimensions of suspension induction and interface desorption, taking into account both heat recovery efficiency and scale inhibition performance, and achieving the optimal balance of the system's overall energy efficiency.

[0019] Furthermore, by constructing a graded protection system that is "mainly based on directional suspension induction and supplemented by thermodynamic regulation", it can effectively cope with sudden water quality shocks, avoid the formation of permanent scale on the heat exchange surface, and significantly extend the continuous operation cycle and online cleaning interval of the equipment. At the same time, by adopting a two-level control architecture of "local real-time closed-loop fine-tuning + global long-cycle iterative upgrade", the system can continuously optimize the dynamic model based on operating data, and the adaptability of the operating conditions will continue to improve with the running time, so as to adapt to geothermal tailwater treatment scenarios with different water quality characteristics.

[0020] Furthermore, the front-end scale inhibition system can precisely control the particle size and concentration of effluent microcrystals, directly adapting to the influent pollution prevention requirements of deep treatment units such as end-of-pipe membrane distillation and adsorption lithium extraction. It eliminates the need for additional independent pretreatment equipment before the end, simplifying the system architecture of the entire process of geothermal tailwater “heat energy cascade recovery + resource extraction”, reducing overall investment costs, and ensuring the long-term stable operation of each unit in the entire process. Attached Figure Description

[0021] Figure 1 This is an overall system diagram of an embodiment of the present invention; Figure 2 This is a flowchart of the high-temperature crystallization and interstage sorting process according to an embodiment of the present invention; Figure 3 This is a flowchart illustrating the seed modification and silicon coating process in an embodiment of the present invention. Figure 4 This is a flowchart illustrating the two-level intelligent control and model self-evolution of an embodiment of the present invention; Figure 5 This is a flowchart illustrating the graded scale inhibition protection and emergency control process according to an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0025] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Please see Figure 1 As shown, this invention proposes a multi-stage heat energy recovery and treatment system for geothermal tailwater, comprising: a high-temperature stage heat exchange unit and a medium-temperature stage heat exchange unit arranged sequentially along the tailwater flow direction; a high-temperature stage directional crystallization induction module for inducing carbonate scale in the tailwater to directionally generate suspended target crystal microcrystals; an interstage grain capture and sorting module for intercepting suspended microcrystals flowing out from upstream and sorting them into reflux seeds and cross-stage seeds according to crystal form and growth state; a seed surface directional modification module for constructing directional anchoring points on the surface of cross-stage seeds that match the dominant scale species of the next stage, generating modified seeds with directional nucleation induction capabilities; and a medium-temperature stage coating growth induction module for receiving the modified seeds. Seed crystals and tailwater induce the orderly growth of silica scale precipitated in the intermediate-temperature stage onto the surface of the modified seed crystals, forming core-shell structured suspended microcrystals. The local intelligent control module, with a built-in coating coupling precipitation kinetic model, coordinates the operating parameters of the high-temperature stage directional crystallization induction module, the inter-stage grain capture and sorting module, the seed crystal surface directional modification module, and the intermediate-temperature stage coating growth induction module based on real-time water quality parameters and seed crystal property data, so that the microcrystal growth process matches the heat exchange temperature zone of the corresponding stage. Thermodynamic control module adjusts the heat exchange operating parameters according to the instructions of the local intelligent control module, pushing the supersaturated precipitation zone of scale to the non-heat exchange section downstream of the heat exchange unit.

[0027] Specifically, the system relies on the natural temperature distribution of the geothermal tailwater cascade cooling and integrates suspended scale inhibition and cascade heat recovery functions along the tailwater transport path. The structure and connection relationship of each module are as follows: The high-temperature stage directional crystallization induction module is set at the front end of the high-temperature stage heat exchange unit. The tailwater flows through this module before entering the heat exchange unit, which promotes the carbonate scale that is easy to precipitate in the high-temperature section to complete directional nucleation better than the water body and generate suspended target crystal microcrystals.

[0028] The interstage grain capture and sorting module is connected in series between the outlet side of the high-temperature stage heat exchange unit and the inlet side of the medium-temperature stage heat exchange unit. It has the functions of intercepting and classifying suspended microcrystals. After sorting, the refluxed seed crystals are reinjected into the inlet of the high-temperature stage directional crystallization induction module to serve as a seed matrix for bulk nucleation and improve the crystallization induction efficiency of the high-temperature section. The cross-stage seed crystals are transported to the downstream seed surface directional modification module.

[0029] The seed surface orientation modification module is connected between the inter-stage grain capture and sorting module and the medium-temperature coating growth induction module. The feed end is connected to the cross-stage seed outlet of the inter-stage grain capture and sorting module, and the discharge end is connected to the upstream of the medium-temperature coating growth induction module. This module modifies the seed surface to target the nucleation characteristics of silicon scale in the medium-temperature range, and constructs anchoring points that can be oriented to bind with silicon scale molecules, so that the seed has the ability to target and induce silicon nucleation.

[0030] The intermediate-temperature stage coating growth induction module is located at the inlet of the intermediate-temperature stage heat exchange unit. The modified seed crystals are mixed with the clean tailwater after interstage separation. This can induce the silica scale precipitated in the intermediate-temperature stage to preferentially adhere to the surface of the modified seed crystals and grow in an orderly manner, forming a core-shell structure of carbonate core and silica shell suspended microcrystals. This keeps the silica components in a suspended state throughout the process, preventing the silica components from adhering and depositing in the heat exchange unit to form hard scale, thereby ensuring the long-term heat exchange efficiency of the heat exchange unit.

[0031] The local intelligent control module incorporates a coating-coupled precipitation kinetic model, which is a multi-physics coupling mechanism-data hybrid model containing at least three coupling sub-models: a carbonate nucleation sub-model, with inputs including temperature, pH, and Ca. 2+ Concentration, CO3 2- The model uses concentration and electromagnetic field strength as inputs, and outputs the nucleation rate and crystal size distribution of aragonite-type calcium carbonate. The model uses silica-coated growth as input, and inputs include dissolved SiO2 concentration, modified seed concentration, surface anchor point density, and temperature. The outputs are the growth rate and coating integrity of the silica shell. The model uses suspension and migration as input, and inputs include microcrystal size, surface zeta potential, and water flow shear rate. The outputs are the suspension stability index and wall collision probability of microcrystals in pipes and heat exchangers at all levels.

[0032] Each sub-model is coupled and transmitted through real-time evolution of microcrystal size: the crystal nucleus size output by the carbonate nucleation sub-model is used as the initial core size input for the silicon-coated growth sub-model, and the core-shell microcrystal size output by the coating growth sub-model is used as the input parameter for the suspension migration sub-model; the local intelligent control module generates control commands for each level of the module synchronously based on the simultaneous solution results of each sub-model, so that the nucleation rate and growth rate of the microcrystals are adapted to the heat transfer temperature range of the corresponding level.

[0033] The thermodynamic control module is connected to the operation control system of the high-temperature heat exchange unit and the medium-temperature heat exchange unit respectively, and is connected to the local intelligent control module. By adjusting the operating thermal parameters of the heat exchange unit, it delays the critical position of scale supersaturation precipitation, serving as a supplementary protection mechanism for suspension-induced scale inhibition.

[0034] By actively constructing a core-shell structure microcrystal with a carbonate core and a silica shell, the silica shell passivates the surface activity of the carbonate microcrystals, significantly reducing their tendency to adhere and agglomerate on the heat exchange wall. On the other hand, the carbonate core provides a directional heterogeneous nucleation carrier for silica scale, preventing silica components from spontaneously forming highly adhesive gels that adhere to the wall. The two work synergistically, and the scale inhibition effect is significantly better than the simple superposition of traditional two-stage independent scale inhibition schemes. Thus, it delays the scaling process on the heat exchange surface from two dimensions: nucleation sites and interfacial adhesion, ensuring the continuous and stable operation of the heat exchange unit.

[0035] After sorting, a portion of the microcrystals generated in the high-temperature section are returned to the local stage to strengthen bulk nucleation, reducing the amount of external seed crystals and reagents added; the other portion is modified and used as nucleation seed crystals in the medium-temperature section, realizing the resource utilization of upstream by-products, eliminating the need for additional external silica scale-induced seed crystals, and reducing the amount of solid waste discharged from the system, significantly reducing system operating costs and material consumption.

[0036] Based on the coating-coupled precipitation kinetic model, the operating parameters of each induction, sorting, and modification module can be synchronously adjusted according to the real-time water quality and seed state, so that the nucleation and growth process of microcrystals is precisely matched with the heat exchange temperature zones at each level. While ensuring the scale inhibition effect, the heat exchange efficiency loss caused by excessive scale inhibition intervention is avoided, and the heat recovery efficiency and scale inhibition effect are synergistically optimized.

[0037] Under normal operating conditions, scale inhibition is achieved through directional suspension induction. When water quality fluctuates or scale load exceeds the induction and control range, thermodynamic control is used to move the scale precipitation zone to the non-heat exchange section, constructing a three-dimensional graded protection system to effectively cope with the impact of water quality fluctuations, avoid the formation of permanent hard scale on the heat exchange surface, and significantly extend the continuous operation cycle and online cleaning interval of the equipment.

[0038] In this embodiment, the geothermal tailwater first enters the high-temperature stage directional crystallization induction module. Under the action of this module, the carbonate scale in the tailwater is directionally induced into suspended target crystal microcrystals. The tailwater carrying the suspended microcrystals then enters the high-temperature stage heat exchange unit, where the high-temperature heat energy is recovered through the heat exchange wall. During this process, the microcrystals remain suspended and flow with the water flow, without depositing on the heat exchange wall.

[0039] The tailwater that has completed the heat exchange in the high-temperature section flows into the interstage crystal capture and sorting module. This module intercepts the suspended microcrystals in the tailwater and divides them into two parts according to their crystal form and growth state: reflux seed crystals and cross-stage seed crystals. The reflux seed crystals are reinjected into the inlet of the high-temperature stage directional crystallization induction module to participate in the next round of carbonate crystallization induction process. The cross-stage seed crystals are transported to the seed surface directional modification module.

[0040] Based on the nucleation characteristics of the dominant scale species in the downstream medium-temperature section, the seed surface orientation modification module modifies the surface of the input cross-stage seed crystals, constructs directional anchoring points on the seed crystal surface, and obtains modified seed crystals with directional nucleation induction capabilities. The modified seed crystals are then introduced into the medium-temperature stage coating growth induction module together with the clean tailwater separated by the interstage grain capture and sorting module.

[0041] Under the action of the medium-temperature coating growth induction module, the silica scale components that tend to precipitate in the effluent as the temperature decreases preferentially coat and grow in an orderly manner on the surface of the modified seed crystals, forming suspended microcrystals with a core-shell structure. The effluent carrying the core-shell structure microcrystals then enters the medium-temperature heat exchange unit to complete the medium-temperature heat recovery. During this process, the silica components are suspended in the water in the form of core-shell microcrystals and do not form an adhesive scale layer on the heat exchange wall.

[0042] During system operation, the local intelligent control module collects water quality parameters and crystal property data at all levels in real time. It performs calculations through the built-in coating coupling precipitation kinetic model and sends operation parameter instructions to the high-temperature stage directional crystallization induction module, the interstage grain capture and sorting module, the crystal surface directional modification module, and the medium-temperature stage coating growth induction module, so that the nucleation and growth process of microcrystals matches the heat exchange temperature zone of the corresponding level, thereby achieving synergistic optimization of scale inhibition effect and heat exchange efficiency.

[0043] When the effluent water quality fluctuates and the local intelligent control module predicts that the scale precipitation load will exceed the regulation capacity of the induction module, the local intelligent control module sends an adjustment command to the thermodynamic regulation module. The thermodynamic regulation module adjusts the operating thermal parameters of the high-temperature stage heat exchange unit or the medium-temperature stage heat exchange unit accordingly, so that the supersaturated precipitation range of scale is shifted to the non-heat exchange section downstream of the heat exchange unit, so as to avoid the heat exchange wall surface from reducing heat exchange efficiency due to scale. After the water quality returns to normal, the original operating parameters are switched back.

[0044] Please see Figure 2 As shown, the high-temperature directional crystallization induction module includes a multi-parameter detection submodule, a multi-mode action submodule, and a timing control submodule. The multi-mode action submodule integrates an electromagnetic field generating component and an ultrasonic generating component. The timing control submodule controls the electromagnetic field generating component and the ultrasonic generating component to operate step-by-step according to a preset timing sequence, inducing carbonate scale to directionally generate aragonite-type microcrystals and maintain their suspension. The interstage grain capture and sorting module includes a solid-liquid separation submodule, a grain detection submodule, and a sorting execution submodule. The grain detection submodule is used to detect the crystal form, particle size, and coating integrity of the microcrystals. Based on the detection results, the sorting execution submodule returns microcrystals that do not meet the growth requirements to the high-temperature directional crystallization induction module and transports microcrystals that meet the interstage requirements to the seed surface directional modification module.

[0045] Specifically, the multi-parameter detection submodule is located at the inlet of the high-temperature directional crystallization induction module and is used to collect water quality parameters such as inlet temperature, pH value, and characteristic ion concentration in real time, and transmit the detection data to the timing control submodule; the multi-mode action submodule integrates an electromagnetic field generating component and an ultrasonic generating component; the timing control submodule can output staged control commands to control the two types of components to operate step by step according to a preset timing sequence, so as to realize the step-by-step regulation of first crystal orientation and then nucleation enhancement; the interstage grain capture and sorting module consists of a solid-liquid separation submodule, a grain detection submodule, and a sorting execution submodule.

[0046] The solid-liquid separation submodule adopts a centrifugal vortex structure, which achieves preliminary separation of suspended microcrystals from clean water through a centrifugal force field. The concentrated microcrystals are then fed into the detection channel of the crystallization detection submodule. The crystallization detection submodule uses microscopic spectral imaging technology to identify the crystal type, particle size, and surface growth state of individual microcrystals online, and transmits the judgment results to the sorting execution submodule. The sorting execution submodule has a built-in three-way diversion channel, which performs diversion control according to preset grading thresholds: microcrystals with small particle size and substandard crystal purity are judged as substandard crystal seeds and returned to the inlet of the high-temperature directional crystallization induction module; microcrystals with pure aragonite crystal form and particle size within the target range are judged as qualified cross-grade crystal seeds and transported to the downstream crystal seed surface directional modification module; microcrystals with excessively large particle size and agglomeration are judged as waste crystal seeds and discharged outside the system for unified disposal.

[0047] By adopting a step-by-step time-sequence control approach that prioritizes crystal orientation followed by nucleation enhancement, the proportion of aragonite-type microcrystals generated can be effectively increased, resulting in stronger microcrystal suspension stability and a lower probability of wall adhesion. Based on precise sorting and recirculation of crystal form and particle size, the reuse of local seed crystals can be achieved, reducing the amount of external reagents added. At the same time, the concentration of crystal nuclei at the inlet water end can be stabilized, improving the stability of crystallization induction efficiency in the high-temperature section. The mode of recirculating and regenerating unqualified microcrystals can reduce the amount of solid waste discharged and improve the material utilization rate of the system.

[0048] In this embodiment, after the tailwater enters the high-temperature directional crystallization induction module, the multi-parameter detection submodule first collects the basic water quality data of the influent. The timing control submodule first activates the electromagnetic field generating component according to the preset action sequence to induce the carbonate scale to transform into aragonite crystals. Then, the ultrasonic generating component is activated to enhance the bulk nucleation process inside the water body and disperse the initially agglomerated microcrystals. Finally, most of the carbonate scale is transformed into suspended aragonite microcrystals.

[0049] The tailwater carrying aragonite microcrystals then flows into the interstage grain capture and sorting module. The solid-liquid separation submodule first separates the suspended microcrystals from the clean water. The grain detection submodule tests the crystal form, particle size, and coating integrity of each separated microcrystal. The sorting execution submodule completes the diversion based on the test results: microcrystals that do not meet the growth standards are returned to the inlet of the high-temperature directional crystallization induction module to participate in the next round of crystallization induction as seed crystals; microcrystals that meet the cross-stage use standards are transported to the downstream seed surface directional modification module.

[0050] Please see Figure 3 As shown, the seed crystal surface directional modification module includes a surface activation submodule and a surface functionalization grafting submodule. The surface activation submodule is used to pretreat the surface of the cross-level seed crystals to enhance the reactivity of the seed crystal surface. The surface functionalization grafting submodule is used to graft functional groups with specific adsorption effects on silica scale molecules onto the seed crystal surface to form the directional anchoring points. The intermediate-temperature coating growth induction module includes a depolymerization and activation submodule, a growth regulation submodule, and a suspension stabilization submodule. The depolymerization and activation submodule is used to break down long-chain silica polymers in the water to release the monomeric silica required for coating growth. The growth regulation submodule is used to induce silica components to preferentially coat and grow on the modified seed crystal surface. The suspension stabilization submodule is used to regulate the surface charge of the core-shell microcrystals to maintain the dispersion state of the particles.

[0051] Specifically, the surface activation submodule employs a weak oxidation etching process, which can utilize dilute hydrogen peroxide solution or ozone aeration treatment to generate active hydroxyl sites in situ at the calcium ion sites on the seed crystal surface. This transforms the seed crystal surface from an inert state to a hydrophilic activated state, providing reaction anchors for subsequent grafting reactions. The modifier for the surface functionalization grafting submodule can be an organic molecule with a silane coupling group, including but not limited to 3-aminopropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane. The silane end of the modifier undergoes a condensation reaction with the hydroxyl groups on the seed crystal surface to achieve fixation, while the active functional group at the other end serves as a directional anchor point for specific adsorption with silicic acid molecules. The concentration of the modifier, reaction temperature, and residence time during the reaction process are all precisely controlled by a local intelligent control module to ensure that the grafting density on the seed crystal surface meets the standards.

[0052] The depolymerization and activation submodule uses high-frequency ultrasonic mechanical vibration to break down spontaneously formed long-chain silica polymers in water into short-chain monomeric silica, providing uniform reaction raw materials for coating growth. The growth regulation submodule achieves directional growth regulation by adding trace amounts of homogeneous nucleation inhibitors. The inhibitors can be selected from low molecular weight polyacrylic acid, polyamino polyether, or phosphonocarboxylic acid polymers. The inhibitors inhibit homogeneous nucleation of silica in water by complexing silica monomers or blocking the surface active sites of spontaneous silica nuclei, forcing silica monomers to migrate directionally to the anchoring points of modified crystal seeds for deposition and growth, forming core-shell structured microcrystals with carbonate cores and silica shells. The suspension stabilization submodule uses a microelectrode array built into the pipeline to adjust the surface zeta potential of the core-shell microcrystals by applying a DC or low-frequency alternating electric field, keeping the absolute value of the potential above a stable threshold, and preventing particle agglomeration and sedimentation through electrostatic repulsion.

[0053] By constructing directional anchoring points on the crystal surface, the orientation of heterogeneous nucleation of silica scale can be improved, avoiding spontaneous nucleation of silica components on the heat exchange wall surface and reducing the risk of scale formation in the mid-temperature range from the root. Through a three-step coating control of depolymerization, regulation, and stabilization, the growth of the silica shell can be made uniform and controllable, resulting in a narrow particle size distribution of the generated core-shell microcrystals, good suspension stability, and less prone to sedimentation and clogging. The design of inhibiting homogeneous nucleation and enhancing heterogeneous nucleation can achieve high scale inhibition efficiency with low reagent dosage and reduce operating costs.

[0054] In this embodiment, after the sorted seed crystals enter the seed crystal surface orientation modification module, the surface activation submodule first pre-treats the seed crystal surface to activate the reaction sites on the seed crystal surface; then the surface functionalization grafting submodule grafts functional groups that can specifically adsorb silicon scale molecules onto the seed crystal surface to complete the construction of the orientation anchoring points and obtain modified seed crystals with targeted nucleation capabilities.

[0055] After being mixed with clean wastewater, the modified seed crystals enter the intermediate-temperature coating growth induction module. The depolymerization and activation submodule first acts on the water to break the spontaneously formed long-chain silica polymers in the water, releasing monomeric silica as coating growth raw material. The growth regulation submodule induces the monomeric silica to preferentially deposit and grow in an orderly manner on the surface of the modified seed crystals, forming core-shell structured microcrystals. The suspension stabilization submodule simultaneously regulates the surface charge of the core-shell microcrystals, enhances the repulsive force between particles, avoids particle aggregation, and maintains a stable suspension state throughout the process.

[0056] Please see Figure 5As shown, it also includes heat exchange wall anti-adhesion modules, which are respectively disposed on the inner wall surfaces of each stage of the heat exchange unit; wherein, the inner wall surface of the high-temperature stage heat exchange unit adopts a biomimetic microgroove structure, and the inner wall surface of the medium-temperature stage heat exchange unit adopts a hydrophobic coating structure, thereby reducing the probability of microcrystal adhesion to the wall surface from a physical perspective; the thermodynamic control module, based on the scale load prediction results output by the local intelligent control module, adjusts the evaporation temperature or heat flux density of the heat exchange unit to constrain the starting position of scale supersaturation precipitation to the non-heat exchange pipe section downstream of the outlet of the corresponding heat exchange unit; wherein the non-heat exchange pipe section corresponding to the high-temperature stage heat exchange unit is the pipe section between its outlet and the inlet of the interstage grain capture and sorting module, and the non-heat exchange pipe section corresponding to the medium-temperature stage heat exchange unit is the pipe section between its outlet and the inlet of the deep treatment unit.

[0057] Specifically, the heat exchange wall anti-adhesion module is an integrated structure processed on the inner wall of each heat exchange unit, directly contacting the water. It is divided into two types of adaptable structures: high-temperature stage and medium-temperature stage. The biomimetic microgroove structure on the inner wall of the high-temperature stage heat exchange unit is a micron-level groove array that mimics the surface of shark skin dermal scales. The groove width is 20-100μm, the groove depth is 10-50μm, and the groove orientation is consistent with the water flow direction. This structure can be directly processed on the surface of the heat exchange plate using laser etching or micro-nano imprinting technology. It can still maintain the stability of the laminar sublayer at the bottom of the groove under turbulent conditions. At the same time, the contact area between the groove tip and the microcrystals is much smaller than that of a smooth surface, which can significantly reduce the van der Waals adhesion between the aragonite-type calcium carbonate microcrystals and the wall surface. Under the action of water flow shear force, the microcrystals that touch the wall surface roll and slide off along the groove, achieving an anti-adhesion effect where the microcrystals contact the wall surface without adhering, further ensuring the normal operation of the heat exchange.

[0058] The hydrophobic coating structure on the inner wall of the intermediate-temperature heat exchange unit is a low surface energy coating made of fluorinated polymers or organosilane materials, with a water contact angle greater than 110°. Silica scale has a high surface hydroxyl density and strong hydrophilicity. Its system free energy increases during the process of spreading and dehydrating condensation on the hydrophobic surface, which is difficult to occur spontaneously thermodynamically. Therefore, silica components are difficult to form a continuous gel layer on the surface of the hydrophobic coating, and can only form sparse, weakly adherent isolated island-like deposits, which are easily washed away and peeled off by water flow.

[0059] The thermodynamic control module is connected to the operation control system of the heat exchange unit and is signal-connected to the local intelligent control module. For the medium-temperature heat exchange unit, the solubility of amorphous silica is increased by raising the evaporation temperature and reducing the heat flux density, thereby inhibiting its supersaturation accumulation inside the heat exchanger. This delays the supersaturation state, which could have overcome the nucleation energy barrier in the low-temperature section of the heat exchanger, until the tailwater flows out of the heat exchanger and the temperature naturally decreases further in the downstream pipe. For the medium-temperature heat exchange unit, raising the evaporation temperature can temporarily raise the minimum temperature level inside the heat exchanger. Since the solubility of amorphous silica increases with temperature, raising the temperature baseline increases the solubility threshold of silica in the current water quality, thereby inhibiting its supersaturation accumulation inside the heat exchanger and preventing a large amount of silica from precipitating out of the heat exchanger. The supersaturation state, which could have overcome the nucleation energy barrier in the low-temperature section of the heat exchanger, is delayed until the tailwater flows out of the heat exchanger and the temperature naturally decreases further in the downstream pipe, thus shifting the starting point of a large amount of precipitation to the non-heat exchange section.

[0060] Unlike the intermediate temperature section, calcium carbonate is a reverse solubility scale, and its precipitation accelerates with increasing temperature. Therefore, a differentiated control strategy is adopted in the high temperature section: by appropriately reducing the heat exchange load or increasing the tailwater flow rate, the residence time of the tailwater in the high temperature zone is shortened. Taking advantage of the lag in calcium carbonate precipitation kinetics, its supersaturation precipitation range is also shifted to the non-heat exchange section outside the heat exchanger outlet. Ultimately, the starting position of supersaturated scale precipitation is constrained within the non-heat exchange tube section downstream of the outlet of the corresponding heat exchange unit. Specifically, the non-heat exchange tube section corresponding to the high temperature stage heat exchange unit is the tube section between its outlet and the inlet of the interstage grain capture and sorting module, and the non-heat exchange tube section corresponding to the intermediate temperature stage heat exchange unit is the tube section between its outlet and the inlet of the deep treatment unit.

[0061] By combining the anti-adhesion structure on the wall with the suspension-induced scale inhibition, the scaling rate is reduced from two dimensions: "reducing wall adhesion" and "reducing precipitation tendency," resulting in a scale inhibition effect superior to single methods. Thermodynamic regulation is used as an emergency backup measure to cope with sudden water quality shocks, preventing the formation of permanent hard scale on the heat exchange surface and extending the online cleaning cycle of the equipment. By confining the precipitation zone to the non-heat exchange section, even if a small amount of deposition occurs, it will not affect the heat exchange efficiency, and it can be uniformly cleaned by the downstream interstage grain capture and sorting module, resulting in lower maintenance costs.

[0062] In the embodiment, when the tailwater flows through each stage of the heat exchange unit, the anti-adhesion module on the heat exchange wall simultaneously plays an anti-adhesion role: the biomimetic microgroove structure on the inner wall of the high-temperature heat exchange unit can weaken the adhesion force between the aragonite microcrystals and the wall, so that the microcrystals in contact with the wall are detached from the wall under the shearing action of the water flow and move with the water flow; the hydrophobic coating structure on the inner wall of the medium-temperature heat exchange unit can reduce the tendency of the silicon components to spread and adhere, and reduce the risk of silicon scale deposition on the wall.

[0063] When the local intelligent control module predicts that the scale precipitation load in the influent exceeds the control range of the induction module, it sends an adjustment command to the thermodynamic control module. The thermodynamic control module adjusts the evaporation temperature of the target heat exchange unit accordingly, so that the critical position of the scale reaching the supersaturated precipitation state moves backward from the inside of the heat exchange unit to the outlet side, and is limited to the non-heat exchange pipe section downstream of the outlet of the corresponding heat exchange unit, ensuring that no adhesive scale layer forms on the heat exchange wall.

[0064] Please see Figure 4 As shown, the local intelligent control module includes a data receiving submodule, a deviation comparison submodule, and a parameter correction submodule. The data receiving submodule is used to collect detection data at each level and feedback data from downstream modules. The deviation comparison submodule is used to compare the actual operating results with the predicted values ​​of the encapsulation coupling elution dynamics model. The parameter correction submodule is used to correct the model parameters based on the comparison deviation. It also includes a global collaborative control module, which is communicatively connected to the local intelligent control module. The global collaborative control module is used to aggregate the entire system's operating data and model deviation data, optimize and update the global dynamic parameters of the encapsulation coupling elution dynamics model, and send the updated parameters to the local intelligent control module to achieve model self-evolution.

[0065] Specifically, the data receiving submodule synchronously collects water quality data, crystal detection data, and equipment operating status data from sensors at all levels, and transmits them uniformly to the deviation comparison submodule. The deviation comparison submodule compares the results obtained from actual operation, such as crystal form ratio, particle size distribution, and interception efficiency, with the theoretical prediction values ​​of the coating coupling precipitation kinetic model item by item, and calculates the degree of deviation of each parameter. The parameter correction submodule, based on the direction and magnitude of the deviation, directionally corrects the kinetic parameters of the corresponding items in the model, and synchronously adjusts the operating parameters of each induction module to complete local real-time closed-loop control.

[0066] The global collaborative control module and the local intelligent control module are connected via industrial IoT communication. The module includes a built-in data aggregation submodule, a global optimization submodule, and a parameter distribution submodule. Its model self-evolution comprises two levels: the first level is parameter self-calibration, where online recursive least squares or Kalman filtering algorithms are used to continuously update the time-varying parameters in the global dynamics model when the accumulated model prediction deviation is within a preset tolerance range; the second level is structural self-evolution, where a symbolic regression algorithm is automatically invoked when the model prediction deviation continuously exceeds a threshold and parameter calibration fails to converge, searching and generating new nucleation rate or growth rate equations in a preset operator and variable library to replace mismatched parts in the existing model, achieving adaptive optimization of the model topology; after offline verification, the updated model is remotely distributed to the local intelligent control module via an encrypted communication channel, completing the version upgrade of the entire system model.

[0067] In this embodiment, during system operation, the data receiving submodule of the local intelligent control module continuously collects detection data from each level of the module and downstream feedback data. The deviation comparison submodule compares the real-time operation results with the prediction results of the built-in coating coupling precipitation kinetic model one by one. The parameter correction submodule corrects the parameters of the corresponding items in the model according to the deviation generated by the comparison, and optimizes the scale inhibition control accuracy of this level in real time.

[0068] The global collaborative control module synchronously aggregates the operating data and model deviation data uploaded by the local intelligent control module. Based on long-term full-condition data, it optimizes and updates the global dynamic parameters of the encapsulated coupling dynamic model. The optimized parameters are then sent back to the local intelligent control module to complete the unified iterative upgrade of the entire system model, so that the control accuracy of the system continues to improve with the running time.

[0069] Please see Figure 5 As shown, a deep treatment unit is installed at the end of the tailwater flow direction; the local intelligent control module adjusts the final particle size and concentration of the core-shell structure microcrystals according to the influent pollution prevention requirements of the deep treatment unit, so that the tailwater quality entering the deep treatment unit matches the end process requirements, ensuring the stable operation of the deep treatment unit.

[0070] Specifically, the advanced treatment unit is located at the end outlet of the system's tailwater and can be either a gas-gap membrane distillation concentration device or an adsorption lithium extraction device. The influent water quality of such devices is highly sensitive to the particle size and concentration of suspended particles: the hydrophobic microporous membrane of the membrane distillation device typically has a pore size between 0.1 and 0.5 μm. If the influent contains suspended microcrystals with a particle size close to or larger than the membrane pores, it will lead to membrane pore blockage and membrane surface fouling, causing a sharp decline in membrane flux. If the adsorbent bed of the adsorption lithium extraction device is covered and wrapped with microcrystals, it will seriously reduce the lithium ion adsorption efficiency and the adsorbent lifespan.

[0071] The local intelligent control module pre-stores the influent water quality control thresholds for the deep treatment unit, including the maximum allowable particle size and the maximum allowable concentration of suspended solids. Using these thresholds as constraints, the module precisely controls the final particle size and total concentration of core-shell structured microcrystals by adjusting the ultrasonic power, reagent dosage, and seed injection amount of the mesothermal coating growth induction module, ensuring that the particle indicators of the system effluent always meet the influent requirements of the deep treatment unit.

[0072] The front-end scale inhibition system directly adapts to the influent requirements of the end-of-pipe treatment process, eliminating the need for additional independent pretreatment equipment before the end, simplifying the overall system architecture and reducing investment costs; precise control of particle size and concentration can avoid problems such as membrane pore blockage and surface contamination of the end-of-pipe treatment unit caused by microcrystals, extending the service life and cleaning cycle of the end-of-pipe unit.

[0073] In this embodiment, the effluent, after undergoing two stages of heat recovery and scale inhibition treatment, flows to the final deep treatment unit. The local intelligent control module adjusts the operating parameters of the mesothermal coating growth induction module in real time according to the influent pollution prevention requirements of the deep treatment unit, and precisely controls the final particle size and concentration of the core-shell structure microcrystals, so that the water quality indicators of the output effluent meet the influent process requirements of the deep treatment unit, and avoids the microcrystals from causing pollution and blockage to the final deep treatment unit.

[0074] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A geothermal tailwater multi-stage heat energy recovery treatment system, characterized in that, include, High-temperature stage heat exchange unit and medium-temperature stage heat exchange unit are arranged sequentially along the tailwater flow direction; A high-temperature directional crystallization induction module is used to induce carbonate scale in effluent to form suspended target crystal microcrystals. The interstage grain capture and sorting module is used to intercept the suspended microcrystals flowing out from upstream and sort them into reflux seeds and cross-stage seeds according to crystal form and growth state; The seed surface orientation modification module is used to construct directional anchoring points on the surface of cross-level seed crystals that match the next level of dominant seed crystals, thereby generating modified seed crystals with directional nucleation induction capabilities. The intermediate-temperature coating growth induction module is used to receive the modified seed crystals and tailwater, and induce the silicon scale precipitated at the intermediate temperature to grow in an orderly manner on the surface of the modified seed crystals, forming a core-shell structured suspended microcrystals. The local intelligent control module has a built-in coating coupling precipitation kinetic model, which is used to coordinate and regulate the operating parameters of the high-temperature stage directional crystallization induction module, the interstage grain capture and sorting module, the seed surface directional modification module and the medium-temperature stage coating growth induction module according to real-time water quality parameters and seed property data, so that the microcrystal growth process matches the heat exchange temperature zone of the corresponding stage. The thermodynamic control module is used to adjust the heat exchange operating parameters according to the instructions of the local intelligent control module, and to shift the supersaturated scale precipitation range to the non-heat exchange section downstream of the heat exchange unit.

2. The geothermal tailwater multistage heat energy recovery treatment system according to claim 1, characterized in that, The high-temperature directional crystallization induction module includes a multi-parameter detection submodule, a multi-mode action submodule, and a timing control submodule. The multi-mode action submodule integrates an electromagnetic field generating component and an ultrasonic generating component. The timing control submodule is used to control the electromagnetic field generating component and the ultrasonic generating component to operate step by step according to a preset timing sequence, inducing carbonate scale to form aragonite-type microcrystals in a directional manner and maintaining their suspension.

3. The geothermal tailwater multistage heat energy recovery treatment system according to claim 2, characterized in that, The interstage grain capture and sorting module includes a solid-liquid separation submodule, a grain detection submodule, and a sorting execution submodule. The grain detection submodule is used to detect the crystal form, grain size and coating integrity of the microcrystals; Based on the detection results, the sorting execution submodule returns microcrystals that do not meet the growth requirements to the high-temperature directional crystallization induction module, and transports microcrystals that meet the cross-level requirements to the seed surface directional modification module.

4. The geothermal tailwater multistage heat energy recovery treatment system according to claim 3, characterized in that, The seed crystal surface directional modification module includes a surface activation sub-module and a surface functionalization grafting sub-module; The surface activation submodule is used to pre-treat the surface of the cross-level seed crystals; The surface functionalized grafting submodule is used to graft functional groups that have a specific adsorption effect on silicon scale molecules onto the surface of the seed crystal to form the directional anchoring point.

5. The geothermal tailwater multistage heat energy recovery processing system of claim 4, wherein, The intermediate-temperature coating growth induction module includes a depolymerization and activation submodule, a growth regulation submodule, and a suspension stabilization submodule. The depolymerization and activation submodule is used to break down long-chain silica polymers in water and release the monomer silica required for coating growth. The growth control submodule is used to induce the preferential growth of silicon components on the surface of the modified seed crystals; The suspension stabilization submodule is used to regulate the surface charge of the core-shell microcrystals.

6. The multi-stage heat recovery treatment system for geothermal tailwater according to claim 5, characterized in that, It also includes, Anti-adhesion modules for heat exchange walls are respectively installed on the inner wall surfaces of each heat exchange unit; The inner wall of the high-temperature heat exchange unit adopts a biomimetic microgroove structure, while the inner wall of the medium-temperature heat exchange unit adopts a hydrophobic coating structure.

7. The multi-stage heat recovery treatment system for geothermal tailwater according to claim 6, characterized in that, Based on the scale load prediction results output by the local intelligent control module, the thermodynamic control module adjusts the evaporation temperature or heat flux density of the heat exchange unit to constrain the starting position of scale supersaturation precipitation to the non-heat exchange pipe section downstream of the outlet of the corresponding heat exchange unit; wherein the non-heat exchange pipe section corresponding to the high-temperature stage heat exchange unit is the pipe section between its outlet and the inlet of the interstage grain capture and sorting module, and the non-heat exchange pipe section corresponding to the medium-temperature stage heat exchange unit is the pipe section between its outlet and the inlet of the deep treatment unit.

8. The multi-stage heat recovery treatment system for geothermal tailwater according to claim 7, characterized in that, The local intelligent control module includes a data receiving submodule, a deviation comparison submodule, and a parameter correction submodule; The data receiving submodule is used to collect detection data at all levels and feedback data from downstream modules; The deviation comparison submodule is used to compare the actual running results with the predicted values ​​of the encapsulation coupling precipitation dynamics model; The parameter correction submodule is used to orient and correct model parameters based on the comparison deviation.

9. The multi-stage heat recovery treatment system for geothermal tailwater according to claim 8, characterized in that, It also includes a global collaborative control module, which communicates and connects with the local intelligent control module; The global collaborative control module is used to aggregate the system's operational data and model deviation data, optimize and update the global dynamic parameters of the encapsulated coupling dynamic model, and send the updated parameters to the local intelligent control module to achieve the model's self-evolution.

10. The multi-stage heat recovery treatment system for geothermal tailwater according to claim 9, characterized in that, A deep treatment unit is installed at the end of the tailwater flow direction; The local intelligent control module adjusts the final particle size and concentration of core-shell structured microcrystals according to the pollution prevention requirements of the influent to the deep treatment unit, so that the quality of the effluent entering the deep treatment unit matches the requirements of the end-of-pipe process.

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