Intelligent dynamic flow rate regulation and double-effect crystallization evaporation device

Abstract

The invention provides an intelligent dynamic flow rate regulation and double-effect crystallization evaporation device which comprises a feeding system, a double-effect evaporation system, a crystallization system, a circulating pump and a flow rate regulation system, the feeding system is connected to the double-effect evaporation system through a pipeline, the double-effect evaporation system is connected to the crystallization system through the circulating pump, and the flow rate regulation system is connected to the crystallization system through a pipeline. The flow rate adjusting system is connected with the circulating pump and the double-effect evaporation system, and the device realizes intelligent dynamic flow rate adjustment through the circulating closed-loop control system, so that the evaporation efficiency and the crystallization quality are optimized. The circulating closed-loop control system comprises a data acquisition unit, a data processing unit, a flow velocity adjusting system, a feedback optimization unit and an abnormity early warning unit, a flow velocity adjusting strategy is optimized based on real-time data, historical data and machine learning, scaling is reduced through disturbance flow velocity control, and the system stability is improved. The evaporation and crystallization efficiency is improved, the energy consumption is reduced, different working condition requirements are met, and the method is suitable for the field of industrial evaporation and crystallization.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial evaporation and crystallization, and particularly to an intelligent dynamic flow rate regulation and double-effect crystallization evaporation device, which is used to optimize evaporation efficiency and crystallization quality through an intelligent control system, and is applicable to industrial processes such as high-efficiency liquid concentration, crystallization separation, and reduction of fouling effects, and is widely used in fields such as chemical engineering, pharmaceuticals, salt chemical engineering, and wastewater treatment. Background Art

[0002] Evaporation crystallization technology is widely used in fields such as chemical engineering, pharmaceuticals, food, salt chemical engineering, and wastewater treatment for solution concentration and solid precipitation. The double-effect evaporation system has become a common solution in industrial production due to its high energy utilization rate. However, there are still many challenges in the existing double-effect evaporation and crystallization systems in terms of flow rate regulation, fouling control, and system optimization, which affect the overall process efficiency and operation stability.

[0003] 1. Deficiencies of the existing evaporation crystallization system Currently, the double-effect evaporation and crystallization system usually adopts a fixed flow rate or a simple PID feedback control to maintain the material flow and the evaporation crystallization process, but there are still the following problems: (1) Flow rate regulation lag, insufficient system response ability Traditional flow rate control methods are usually based on static parameter settings and cannot accurately adapt to the real-time changes of the feed flow rate, evaporation rate, and crystallization process. When the working conditions fluctuate (such as changes in raw material concentration, steam pressure fluctuations, etc.), the system is difficult to adjust in a timely manner, which may lead to a decrease in evaporation efficiency or uneven crystallization.

[0004] (2) Severe fouling phenomenon, affecting heat transfer and equipment life During the evaporation and crystallization process, scale is likely to form on the surface of the equipment, especially in the heat exchange tubes of the evaporator and the circulation pipeline. Uneven flow rate distribution or local flow dead zones will exacerbate fouling, reduce heat transfer efficiency, increase cleaning and maintenance costs, and even lead to unplanned shutdown of the equipment.

[0005] (3) Lack of intelligent optimization and adaptive control ability Most of the existing control systems rely on manual adjustment of empirical parameters and are difficult to achieve precision and dynamic optimization. With the development of industrial production towards automation and intelligence, traditional control methods can no longer meet the production requirements of high efficiency, energy saving, safety, and stability.

[0006] 2. Development trend and improvement requirements With the development of industrial intelligence, intelligent control technology, data analysis, and machine learning algorithms are increasingly widely applied in process optimization. For an evaporation crystallization system, there is an urgent need for a technology that can collect data in real time, intelligently predict the flow rate, and dynamically optimize the evaporation crystallization process to improve production efficiency, reduce energy consumption, and mitigate the impact of scaling.

[0007] In view of the problems existing in the prior art, the present invention provides an intelligent dynamic flow rate regulation and double-effect crystallization evaporation device. Based on a cyclic closed-loop control system, data acquisition, intelligent optimization algorithms, and disturbed flow rate control, it realizes efficient evaporation, stable crystallization, and intelligent regulation of the flow rate, thereby enhancing the overall process performance, reducing maintenance costs, and improving production stability and energy efficiency. Summary of the Invention

[0008] The present invention aims to overcome the deficiencies of the existing double-effect evaporation and crystallization systems in terms of flow rate regulation, evaporation efficiency, and scaling control, and provides an intelligent dynamic flow rate regulation and double-effect crystallization evaporation device. By introducing a cyclic closed-loop control system, combining data acquisition, intelligent optimization algorithms, and disturbed flow rate control, the present invention realizes real-time monitoring, dynamic optimization, and intelligent regulation of the flow rate to improve evaporation efficiency, enhance crystallization quality, and reduce the impact of scaling, thereby enhancing the overall process performance and operation stability.

[0009] According to the present invention, there is provided an intelligent dynamic flow rate regulation and double-effect crystallization evaporation device, which includes a feeding system, a double-effect evaporation system, a crystallization system, a circulation pump, and a flow rate regulation system. The feeding system is connected to the double-effect evaporation system through a pipeline. The double-effect evaporation system is connected to the crystallization system through the circulation pump. The flow rate regulation system is connected to the circulation pump and the double-effect evaporation system. The device realizes intelligent dynamic flow rate regulation through the above cyclic closed-loop control system, and collaboratively optimizes the evaporation efficiency of the double-effect evaporation system and the crystallization quality of the crystallization system.

[0010] Optionally, the cyclic closed-loop control system includes a data acquisition unit. The data acquisition unit is installed through sensors at the pipeline connecting the feeding system and the double-effect evaporation system, the connection between the double-effect evaporation system and the crystallization system, and the easily scaled parts to collect the feeding flow rate, evaporation rate, crystallization process parameters, and scaling conditions in real time.

[0011] Optionally, the double-effect evaporation system includes a first-effect evaporator and a second-effect evaporator. The first-effect evaporator is connected to the second-effect evaporator through a steam pipeline. The second-effect evaporator is connected to the crystallization system through the circulation pump. The data acquisition unit is installed through sensors inside the first-effect evaporator and the second-effect evaporator and at the top of the crystallization system to collect the evaporation rates of the first-effect evaporator and the second-effect evaporator and the crystallization process parameters of the crystallization system.

[0012] Optionally, the cyclic closed-loop control system includes a data processing unit, which calculates the optimal flow rate based on the feed flow rate, evaporation rate, crystallization process parameters, and fouling condition provided by the data acquisition unit, and combines historical data (Formula 1: ), where is the optimal flow rate, is the feed flow rate, T is the temperature, S is the supersaturation, is the pressure difference between effects.

[0013] Optionally, the data processing unit includes a partition control unit and an inter-effect pressure difference optimization unit. The partition control unit calculates the local flow rate according to the evaporation rate and crystallization process parameters at the connection between the double-effect evaporation system and the crystallization system provided by the data acquisition unit. The inter-effect pressure difference optimization unit optimizes the pressure difference by adjusting the steam pipeline valve between the first-effect evaporator and the second-effect evaporator to support intelligent flow rate adjustment and improve the double-effect evaporation efficiency.

[0014] Optionally, the cyclic closed-loop control system includes a flow rate adjustment system, which includes a circulating pump speed control unit, a partition valve control unit, and a disturbance flow rate control unit. The circulating pump speed control unit is electrically connected to the circulating pump. The partition valve control unit is installed on the pipeline connecting the double-effect evaporation system and the crystallization system through a valve. The disturbance flow rate control unit is connected to the pipeline at the fouling-prone part. The flow rate adjustment system dynamically adjusts according to the local flow rate calculated by the partition control unit to optimize the double-effect crystallization process.

[0015] Optionally, the disturbance flow rate control unit periodically changes the flow rate according to the fouling condition provided by the data acquisition unit to form a micro-vortex or micro-oscillation effect, reduce crystal deposition, and co-regulate the flow rate according to the optimization result of the inter-effect pressure difference optimization unit to improve the evaporation efficiency of the double-effect evaporation system.

[0016] Optionally, the cyclic closed-loop control system includes a feedback optimization unit, which adaptively adjusts the flow rate strategy based on the long-term operation data of the feed flow rate, evaporation rate, crystallization process parameters, and fouling condition provided by the data acquisition unit, combined with machine learning optimization and fouling trend analysis (Formula 2: = ), where is the predicted flow rate, is the historical flow rate, is the real-time flow rate, and are the weight coefficients.

[0017] Optionally, the device includes an anomaly warning unit. The anomaly warning unit is connected to the double-effect evaporation system and the crystallization system through a data line, detects anomalies based on the feed flow rate, evaporation rate, crystallization process parameters, and scaling condition provided by the data acquisition unit, and issues a warning signal when instability or an increasing scaling trend is detected.

[0018] Optionally, the device implements an optimized strategy for double-effect crystallization evaporation with intelligent flow rate regulation through the cyclic closed-loop control system. According to the feed flow rate, evaporation rate, and load conditions provided by the data acquisition unit, the evaporation parameters of the first-effect evaporator and the second-effect evaporator of the double-effect evaporation system, including flow rate, temperature, and pressure difference, are dynamically adjusted to adapt to efficient evaporation and crystallization under different load conditions.

[0019] Through intelligent dynamic flow rate regulation and closed-loop optimization control, the present invention improves the automatic adjustment ability of the evaporation crystallization system and overcomes the problem that the flow rate regulation of traditional systems relies on fixed parameters. By means of the data acquisition unit, the feed flow rate, evaporation rate, crystallization process, and scaling condition are monitored in real time, and combined with the historical data analysis and machine learning optimization of the data processing unit, precise flow rate control is achieved, improving evaporation efficiency and crystallization quality. Through the inter-effect pressure difference optimization unit, the steam pipeline valve is dynamically adjusted to improve heat transfer efficiency and reduce energy consumption. The disturbance flow rate control unit periodically adjusts the flow rate according to the scaling trend analysis to reduce crystal deposition and extend the service life of the equipment. In addition, the anomaly warning unit can timely detect flow rate anomalies and scaling trends and make adjustments to improve the operation stability of the system. The present invention is applicable to the field of industrial evaporation crystallization, can adapt to different load conditions, improve production efficiency, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of an intelligent dynamic flow rate regulation and double-effect crystallization evaporation device provided by the present invention.

[0021] Figure 2 It is a schematic diagram of the positions of the double-effect crystallization evaporation device and sensors provided by the present invention.

[0022] Figure 3 It is a schematic structural diagram of the flow rate regulation system provided by the present invention.

[0023] Figure 4 It is a schematic flow chart of an intelligent dynamic flow rate regulation and double-effect crystallization evaporation device provided by the invention.

[0024] Reference Numerals: Cyclic closed-loop control system 100, feed system 111, double-effect evaporation system 112, circulation pump 113, crystallization system 114, flow rate regulation system 110, cyclic closed-loop control system 100; The first-effect evaporator 1121, the second-effect evaporator 1122; the circulating pump speed control unit 1101, the partition valve control unit 1102, the disturbance flow velocity control unit 1103. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings in the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

[0026] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0027] The present invention aims to overcome the deficiencies of the existing double-effect evaporation and crystallization system 114 in terms of flow rate regulation, evaporation efficiency, and scale control, and provides an intelligent dynamic flow rate regulation and double-effect crystallization evaporation device. The present invention realizes real-time monitoring, dynamic optimization, and intelligent regulation of the flow rate by introducing a circulating closed-loop control system 100100, combining data acquisition, intelligent optimization algorithms, and disturbance flow velocity control, so as to improve the evaporation efficiency, improve the crystallization quality, and reduce the influence of scale formation, thereby enhancing the overall process performance and operation stability.

[0028] The present invention provides an intelligent dynamic flow rate and double-effect crystallization evaporation device. Please refer to Figure 1 、 Figure 4As shown, in a specific embodiment, the intelligent dynamic flow rate regulation and double-effect crystallization evaporation device is used for the concentration and crystallization process of a solution. Taking a sodium chloride solution as an example, the initial concentration is 15%. The system process starts from feeding. The feeding system 111 extracts the solution from the storage tank at an initial flow rate of 15 m³ / h through a corrosion-resistant stainless steel pipe. A manual stop valve and an electromagnetic flowmeter are installed on the pipe for preliminary regulation and monitoring of the feeding flow rate to ensure the stable entry of the solution into the subsequent system. The solution then flows into the double-effect evaporation system 112, which adopts a two-stage evaporation structure to achieve efficient energy utilization. The first-effect evaporator 1121 introduces high-temperature steam (pressure 0.4 MPa, temperature 130°C) through an external steam pipe. The steam heats the solution to 100°C through the heat exchange tubes. At this time, the water in the solution begins to evaporate at an evaporation rate of about 4 m³ / h. The generated secondary steam (temperature about 95°C) is guided to the first-effect evaporator 1122 through a connecting pipe. Pressure gauges and regulating valves are provided on the pipe for monitoring and adjusting the steam flow rate. The first-effect evaporator 1122 uses this secondary steam as a heat source to heat the solution to 80°C through a heat exchanger, further concentrating the solution to near saturation, with an evaporation rate of about 3 m³ / h. The concentration of the concentrated solution can reach 22%. The condensed water generated during the evaporation process is discharged from the system through a drain pipe to maintain the continuity of the process. The concentrated solution is then transported to the crystallization system 114 through the circulation pump 113. The circulation pump 113 adopts variable frequency control, and the initial flow rate is set to 14 m³ / h. The pump body is connected to a pressure-resistant hose to reduce the vibration impact. The crystallization system 114 is a crystallization tank with a jacket cooling device. After the concentrated solution enters, the temperature is reduced to 50°C through the cooling water circulation. Sodium chloride crystals gradually precipitate. The crystals are formed in a suspended state in the tank and settle to the bottom, while the mother liquor is circulated back or discharged through the overflow port. The flow rate regulation system 110 is connected to the circulation pump 113 and the double-effect evaporation system 112 to achieve intelligent dynamic flow rate regulation through the circulation closed-loop control system 100100. The specific process is as follows: The sensor continuously collects the evaporation rate (4 m³ / h and 3 m³ / h), temperature (100°C and 80°C), and crystallization parameters (such as supersaturation S = 1.3). The data is transmitted to the control unit. After analysis by the control unit according to the preset algorithm, an adjustment signal is output. For example, the flow rate is increased to 16 m³ / h at the initial stage of concentration to improve the water removal efficiency, and reduced to 12 m³ / h during the crystallization stage to promote crystal growth. The adjustment is executed through the frequency converter of the circulation pump 113 and the pipeline valves, forming a closed-loop feedback for the whole process. This intelligent dynamic flow rate regulation synergistically optimizes the evaporation efficiency of the double-effect evaporation system 112 and the crystal quality of the crystallization system 114, and is applicable to various solution concentration and crystallization scenarios. The system operates stably, and the quality of the crystal output is reliable, being able to flexibly adapt to different working conditions.

[0029] Through intelligent dynamic flow rate regulation and closed-loop optimization control, the present invention improves the automatic regulation ability of the evaporation crystallization system 114 and overcomes the problem that the flow rate regulation of traditional systems depends on fixed parameters. The data acquisition unit monitors the feed flow rate, evaporation rate, crystallization process, and fouling situation in real time, and combines the historical data analysis and machine learning optimization of the data processing unit to achieve precise flow rate control, improve evaporation efficiency and crystallization quality. The inter-effect pressure difference optimization unit dynamically adjusts the steam pipeline valve to improve heat transfer efficiency and reduce energy consumption. The disturbance flow rate control unit periodically adjusts the flow rate according to the fouling trend analysis to reduce crystal deposition and extend the service life of the equipment. In addition, the abnormal warning unit can timely detect abnormal flow rates and fouling trends and make adjustments to improve the operation stability of the system. The present invention is applicable to the industrial evaporation crystallization field, can adapt to different load conditions, improve production efficiency, and reduce maintenance costs.

[0030] In some specific embodiments, the loop closed-loop control system 100 includes a data acquisition unit. During the process of processing a sodium chloride solution with a concentration of 15%, the feed system 111 transports the solution to the double-effect evaporation system 112 at an initial flow rate of 15 m³ / h through a corrosion-resistant stainless steel pipeline. The double-effect evaporation system 112 adopts a two-stage evaporation structure. The first-effect evaporator 1121 heats the solution to 100°C using external steam (pressure 0.4 MPa), and the first-effect evaporator 1122 heats it to 80°C using secondary steam. After concentrating the solution, it is transported to the crystallization system 114 through a circulation pump 113 and cooled to 50°C to precipitate sodium chloride crystals.

[0031] Furthermore, the data acquisition unit collects key parameters in real time through sensors: an electromagnetic flowmeter is installed on the pipeline connecting the feed system 111 and the double-effect evaporation system 112 to monitor the feed flow rate of 15 m³ / h with an accuracy of ±0.5%; a liquid level sensor and a concentration sensor are installed at the connection between the double-effect evaporation system 112 and the crystallization system 114 to record the evaporation rate (4 m³ / h in the first effect, 3 m³ / h in the second effect) and supersaturation (S = 1.3) respectively; a pressure sensor is installed at the easily fouled part (such as the outlet pipeline of the first-effect evaporator 1122) to detect the pressure difference change (∆P = 0.06 MPa) to reflect the fouling situation, and at the same time, a temperature sensor is equipped to record the local temperature (80°C). These sensors are all made of corrosion-resistant materials, installed on the inner wall of the pipeline or key nodes, and connected to the control center through data lines, transmitting data every 10 seconds to ensure real-time performance.

[0032] It can be understood that the data acquisition unit comprehensively captures the feed flow rate, evaporation rate, crystallization process parameters, and fouling situation through multi-point sensors, providing a reliable basis for loop closed-loop control. The system can timely sense changes in the operating state, ensure the stability of the sodium chloride solution concentration and crystallization process, and the quality of crystal output is reliable.

[0033] In some embodiments, as Figure 2 shown, the double-effect evaporation system 112 includes a first-effect evaporator 1121 and a second-effect evaporator 1122. During the process of treating a sodium chloride solution with a concentration of 15%, the feeding system 111 transports the solution to the first-effect evaporator 1121 through a corrosion-resistant stainless steel pipeline at an initial flow rate of 15 m³ / h. The first-effect evaporator 1121 introduces high-temperature steam (pressure 0.4 MPa, temperature 130°C) through an external steam pipeline, heats the solution to 100°C, evaporates part of the water, with an evaporation rate of approximately 4 m³ / h. The generated secondary steam (temperature approximately 95°C) is transported to the second-effect evaporator 1122 through a steam pipeline. The second-effect evaporator 1122 uses this secondary steam as a heat source, heats the solution to 80°C, further concentrates the solution to a nearly saturated state, with an evaporation rate of approximately 3 m³ / h. The concentrated solution is transported to the crystallization system 114 through a circulation pump 113 at a flow rate of 14 m³ / h. In the crystallization system 114, the solution is cooled to 50°C, and sodium chloride crystals begin to precipitate and settle. The data acquisition unit conducts real-time monitoring through sensors: a temperature sensor (recording 100°C) and a steam flowmeter (measuring an evaporation rate of 4 m³ / h) are installed inside the first-effect evaporator 1121, a liquid level sensor and a temperature sensor (recording 80°C, evaporation rate 3 m³ / h) are installed inside the second-effect evaporator 1122, and a concentration sensor and an optical sensor are installed at the top of the crystallization system 114 to collect the supersaturation (S = 1.3) and the crystal growth rate (approximately 0.5 mm / h) respectively. These sensors are made of high-temperature and corrosion-resistant materials to ensure stable operation in a high-salt environment. The data is transmitted to the control system through cables and updated every minute.

[0034] It can be understood that through the series operation of the first-effect evaporator 1121 and the second-effect evaporator 1122 and the full utilization of the secondary steam, the double-effect evaporation system 112 achieves efficient water removal and a stable concentration process. The sodium chloride crystals produced by the crystallization system 114 have uniform particles and reliable quality. The real-time monitoring of the data acquisition unit provides accurate data support for the evaporation and crystallization processes, ensuring the stable operation of the device in the scenario of concentrating and crystallizing sodium chloride solution.

[0035] In some embodiments, the circulating closed-loop control system 100 includes a data processing unit. The data processing unit calculates the optimal flow rate (Formula 1: ) based on the feeding flow rate, evaporation rate, crystallization process parameters, and fouling conditions provided by the data acquisition unit, in combination with historical data, where is the optimal flow rate, is the feeding flow rate, T is the temperature, S is the supersaturation, is the pressure difference between effects.

[0036] Specifically, during the process of treating a sodium chloride solution with a concentration of 15%, the feeding system 111 transports the solution to the double-effect evaporation system 112 through a pipeline at an initial flow rate of 15 m³ / h. The first-effect evaporator 1121 heats the solution to 100°C using external steam (pressure 0.4 MPa) to evaporate part of the water. The second-effect evaporator 1122 then heats the solution to 80°C using the secondary steam generated in the first effect and concentrates it to a nearly saturated state. The data acquisition unit collects key parameters in real time through sensors: the feeding flow rate ( = 15 m³ / h) is measured by a flowmeter installed in the feeding pipeline; the evaporation rate is measured by level sensors and steam flowmeters inside the first-effect and second-effect evaporators 1122, which are 4 m³ / h and 3 m³ / h respectively; the crystallization process parameters include the supersaturation (S = 1.3) of the solution in the crystallization system 114, which is measured by a top concentration sensor; the fouling situation is indirectly reflected by detecting the pressure difference change (∆P = 0.06 MPa) through a pressure sensor in the pipeline. The data processing unit receives this real-time data and combines it with historical operation records (such as the average flow rate of 14 m³ / h and the temperature curve in the previous hour), and calculates the optimal flow rate through the formula For example, under the current conditions, the temperature T = 100°C (first effect) / 80°C (second effect), the supersaturation S = 1.3, and the inter-effect pressure difference ∆P = 0.06 MPa. The data processing unit calculates the optimal flow rate = 16 m³ / h based on a preset algorithm (such as a weighted linear model). The calculation process is completed in an embedded processor, which is integrated in the control cabinet and updates the calculation result every 5 seconds. Subsequently, the data processing unit transmits the optimal flow rate signal to the circulation pump 113, and adjusts the pump speed through a frequency converter to make the actual flow rate gradually approach 16 m³ / h. The solution finally enters the crystallization system 114, and sodium chloride crystals precipitate when cooled to 50°C.

[0037] It can be understood that through the comprehensive analysis of real-time data and historical data, the optimal flow rate calculated by the data processing unit effectively balances the evaporation efficiency of the double-effect evaporation system 112 and the crystal output stability of the crystallization system 114, and avoids the risk of insufficient evaporation caused by too fast a flow rate or pipeline fouling caused by too slow a flow rate. The adjusted flow rate makes the treatment of the solution in the evaporation and crystallization stages smoother, the crystal particles are uniform, and the precipitation process is controllable, meeting the industrial requirements of sodium chloride concentration and crystallization. At the same time, the system has a fast response speed, and the real-time nature of flow rate optimization calculation and adjustment improves the operation efficiency of the device, reduces energy consumption waste, enhances the reliability of long-term operation, and provides a practical reference for the treatment of similar high-salt solutions.

[0038] In some embodiments, the intelligent dynamic flow rate regulation and double-effect crystallization evaporation device is used for the concentration and crystallization process of sodium chloride solution. Its cyclic closed-loop control system 100 includes a data processing unit, which further includes a partition control unit and an inter-effect pressure difference optimization unit. During the process of processing a sodium chloride solution with a concentration of 15%, the feeding system 111 transports the solution to the double-effect evaporation system 112 through a pipeline at an initial flow rate of 15 m³ / h. The first-effect evaporator 1121 uses external steam (pressure 0.4 MPa) to heat the solution to 100°C, evaporating part of the water. The evaporation rate is about 4 m³ / h. The generated secondary steam is transported to the first-effect evaporator 1122 through a steam pipeline, and an electric control valve (initial opening 50%) is installed on the pipeline. The first-effect evaporator 1122 uses this secondary steam to heat the solution to 80°C, further concentrating the solution to a near-saturated state. The evaporation rate is about 3 m³ / h. The concentrated solution is transported to the crystallization system 114 by a circulation pump 113 at a flow rate of 14 m³ / h, and sodium chloride crystals precipitate out when cooled to 50°C. The data acquisition unit collects data in real time through sensors: the evaporation rates (4 m³ / h and 3 m³ / h) at the connection between the first-effect evaporator 1121 and the first-effect evaporator 1122 are measured by a steam flowmeter, and the supersaturation (S = 1.3) at the connection of the crystallization system 114 is recorded by a concentration sensor. The partition control unit calculates the local flow rate based on this data. For example, according to the evaporation rate at the outlet of the first-effect evaporator 1122 and the supersaturation at the inlet of the crystallization system 114, the local flow rate is determined to be 12 m³ / h, which is achieved by adjusting the speed of the circulation pump 113 and the pipeline valves. The inter-effect pressure difference optimization unit optimizes the pressure difference between the first effect and the second effect from 0.05 MPa to 0.07 MPa by adjusting the steam pipeline valve (increasing the opening from 50% to 60%), improving the heat energy transfer efficiency of the secondary steam. The data processing unit integrates the local flow rate (12 m³ / h) of the partition control unit and the pressure difference result (0.07 MPa) of the inter-effect pressure difference optimization unit, and finally adjusts the flow rate of the circulation pump 113 to 16 m³ / h to ensure the stable operation of the overall system.

[0039] It can be understood that the partition control unit makes the connection between the double-effect evaporation system 112 and the crystallization system 114 smoother by accurately calculating the local flow rate, avoiding the efficiency decline caused by flow rate imbalance. The inter-effect pressure difference optimization unit optimizes the utilization rate of secondary steam through valve adjustment, improving the thermal efficiency of the double-effect evaporation system 112. The coordinated optimization of the flow rate and the pressure difference ensures the stability of the sodium chloride solution concentration process, with uniform crystal precipitation and reliable quality, and the device operates efficiently.

[0040] In some embodiments, such as Figure 3As shown, the flow rate regulating system 110 of the cyclic closed-loop control system 100 further includes a circulating pump speed control unit, a partition valve control unit, and a disturbance flow rate control unit. During the process of processing a sodium chloride solution with a concentration of 15%, the feeding system 111 transports the solution to the double-effect evaporation system 112 through a pipeline at an initial flow rate of 15 m³ / h. The first-effect evaporator 1121 heats the solution to 100°C using external steam (pressure 0.4 MPa), evaporates part of the water, and the evaporation rate is about 4 m³ / h. The generated secondary steam enters the first-effect evaporator 1122. The first-effect evaporator 1122 uses this secondary steam to heat the solution to 80°C, concentrates the solution to near saturation, and the evaporation rate is about 3 m³ / h. The concentrated solution is transported to the crystallization system 114 through the circulating pump 113, and sodium chloride crystals precipitate when cooled to 50°C. The circulating pump speed control unit is electrically connected to the circulating pump 113, and the initial pump speed is set to 15 m³ / h. According to the local flow rate requirement calculated by the partition control unit (for example, the local flow rate from the outlet of the first-effect evaporator 1122 to the inlet of the crystallization system 114 is 12 m³ / h), the pump speed is adjusted to 16 m³ / h through a frequency converter to meet the optimized demand for the overall flow rate. The partition valve control unit adjusts the valve opening from fully open to 70% according to the local flow rate requirement through an electric valve (valve diameter DN50) installed on the pipeline connecting the double-effect evaporation system 112 and the crystallization system 114, and precisely controls the flow rate of the solution entering the crystallization system 114. The disturbance flow rate control unit is connected to the pipeline at the fouling-prone part (such as the outlet of the first-effect evaporator 1122), and periodically introduces flow rate disturbances (5 pulses per minute, each increasing the flow rate by 0.5 m³ / h for 2 seconds) through a small pulse pump to form micro-vortices to reduce fouling deposits. Finally, the flow rate regulating system 110 dynamically adjusts according to the calculation results of the partition control unit to make the system operate stably.

[0041] Among them, the coordinated regulation of the circulating pump speed control unit and the partition valve control unit enables the flow rate to flexibly adapt between the double-effect evaporation system 112 and the crystallization system 114, ensuring the continuity of solution concentration and crystal precipitation. The disturbance flow rate control unit effectively reduces pipeline fouling through micro-vortices, ensuring the stability of long-term operation. The overall flow rate optimization improves the evaporation efficiency and crystallization quality. The sodium chloride crystal particles are uniform, the device operates reliably, and meets the industrialized concentration and crystallization requirements.

[0042] In one embodiment, the disturbance flow rate control unit plays a crucial role. As described above, during the process of treating a sodium chloride solution with a concentration of 15%, the feeding system 111 transports the solution to the double-effect evaporation system 112 through a pipeline at an initial flow rate of 15 m³ / h. The first-effect evaporator 1121 heats the solution to 100°C using external steam (pressure 0.4 MPa), evaporates a part of the water, and the evaporation rate is about 4 m³ / h. The generated secondary steam is transported to the first-effect evaporator 1122 through a steam pipeline. The first-effect evaporator 1122 heats the solution to 80°C using this secondary steam, further concentrates the solution to a nearly saturated state, and the evaporation rate is about 3 m³ / h. The concentrated solution is transported to the crystallization system 114 through a circulation pump 113, and sodium chloride crystals precipitate when cooled to 50°C. The data acquisition unit monitors the scaling condition of the scaling-prone part (such as the outlet pipeline of the first-effect evaporator 1122) through a pressure sensor, and detects that the pressure difference slowly rises from 0.05 MPa to 0.06 MPa, indicating a scaling trend.

[0043] Furthermore, based on this data, the disturbance flow rate control unit periodically changes the flow rate. For example, it introduces 5 disturbances per minute through a small pulse pump, with the flow rate increasing by 0.5 m³ / h each time for 2 seconds, forming a micro-vortex effect; or generates micro-oscillations (frequency 10 Hz, amplitude 0.2 mm) through a pipeline vibrator every 30 seconds to disturb the sediment. At the same time, the inter-effect pressure difference optimization unit adjusts the steam pipeline valve between the first effect and the second effect (the opening degree increases from 50% to 60%), optimizes the inter-effect pressure difference to 0.07 MPa, and improves the utilization rate of secondary steam. The disturbance flow rate control unit further adjusts the disturbance frequency to 6 times per minute according to the optimized pressure difference result, and synergistically increases the flow rate to 16 m³ / h to ensure the evaporation efficiency.

[0044] It can be understood that the disturbance flow rate control unit effectively reduces the crystal deposition at the scaling-prone part through micro-vortices and micro-oscillations, keeps the pipeline unobstructed, and extends the cleaning cycle. Combined with the coordinated adjustment of the inter-effect pressure difference optimization unit, the evaporation efficiency of the double-effect evaporation system 112 is improved, the solution concentration is stable, the quality of the sodium chloride crystals produced by the crystallization system 114 is reliable, the overall operation efficiency and durability of the device are enhanced, and it is suitable for long-term industrial applications.

[0045] In some embodiments, the cyclic closed-loop control system 100 includes a feedback optimization unit, which is applicable to process a sodium chloride solution with a concentration of 15%. The feeding system 111 transports the solution to the double-effect evaporation system 112 through a pipeline at an initial flow rate of 15 m³ / h. The first-effect evaporator 1121 uses external steam (pressure 0.4 MPa) to heat the solution to 100°C, evaporates part of the water, with an evaporation rate of about 4 m³ / h. The generated secondary steam is transported to the first-effect evaporator 1122 through a steam pipeline. The first-effect evaporator 1122 uses this secondary steam to heat the solution to 80°C, further concentrates the solution to a near-saturated state, with an evaporation rate of about 3 m³ / h. The concentrated solution is transported to the crystallization system 114 through a circulation pump 113, and sodium chloride crystals precipitate when cooled to 50°C. The data acquisition unit collects long-term operation data in real time through sensors: the feeding flow rate ( = 15 m³ / h) is monitored by a flow meter, the evaporation rate (4 m³ / h for the first effect and 3 m³ / h for the second effect) is recorded by a liquid level sensor, the crystallization process parameters such as supersaturation (S = 1.3) are measured by a concentration sensor, and the fouling situation is detected by a pipeline pressure difference sensor (∆P = 0.06 MPa).

[0046] Furthermore, based on this data, the feedback optimization unit combines a machine learning algorithm (such as a regression model based on time series) and fouling trend analysis to calculate the predicted flow rate = , where the historical flow rate takes the average value of the previous hour, 14.5 m³ / h, the real-time flow rate is 15 m³ / h, and the weight coefficients α = 0.6, β = 0.4 (obtained by training based on long-term operation data), and the result is = 14.7 m³ / h. The feedback optimization unit transmits this result to the circulation pump 113, adjusts the pump speed to 14.7 m³ / h through a frequency converter, and fine-tunes the values of α and β every two hours according to the fouling trend (such as increasing α to 0.65 and decreasing β to 0.35) to adaptively adjust the flow rate strategy.

[0047] It can be understood that through machine learning and the analysis of long-term data, the feedback optimization unit realizes the adaptive adjustment of the flow rate, enables the double-effect evaporation system 112 and the crystallization system 114 to be coordinated in different operation stages, and keeps the solution concentration and crystal precipitation processes stable. The prediction of the fouling trend reduces the risk of pipeline blockage, extends the maintenance cycle. At the same time, the optimized flow rate strategy improves the evaporation efficiency and crystal quality, enhances the operation reliability and adaptability of the device, and is suitable for industrial sodium chloride concentration and crystallization scenarios.

[0048] In some embodiments, the intelligent dynamic flow rate regulation and double-effect crystallization evaporation device further includes an abnormal warning unit. During the process of treating a sodium chloride solution with a concentration of 15%, the feeding system 111 transports the solution to the double-effect evaporation system 112 through a pipeline at an initial flow rate of 15 m³ / h. The first-effect evaporator 1121 is heated to 100°C using external steam (pressure 0.4 MPa), and the second-effect evaporator 1122 is heated to 80°C using secondary steam. After concentrating the solution, it is transported to the crystallization system 114 through the circulation pump 113 and cooled to 50°C to precipitate sodium chloride crystals. The abnormal warning unit is connected to the double-effect evaporation system 112 and the crystallization system 114 through a data line and receives real-time data provided by the data acquisition unit: feeding flow rate (15 m³ / h), evaporation rate (4 m³ / h for the first effect, 3 m³ / h for the second effect), supersaturation (S = 1.3), and scaling condition (pressure difference ∆P rises from 0.06 MPa to 0.08 MPa).

[0049] Furthermore, the abnormal warning unit is built-in with a threshold detection algorithm. For example, the normal range of the evaporation rate is set to 3.5 - 4.5 m³ / h, and the upper limit of the pressure difference is 0.07 MPa. When the evaporation rate of the second-effect evaporator 1122 drops to 3.2 m³ / h during operation, or the pipeline pressure difference rises to 0.08 MPa, the system determines that it is unstable or the scaling trend is increasing. The abnormal warning unit issues an audible and visual alarm signal (the buzzer sounds for 3 seconds and the red light flashes) through the control center, and records the abnormal data in the log file to prompt the operator to check the pipeline or adjust the flow rate.

[0050] In some embodiments, the intelligent dynamic flow rate regulation and double-effect crystallization evaporation device is used for the concentration and crystallization process of sodium chloride solution. The intelligent flow rate regulation double-effect crystallization evaporation optimization strategy is realized through the circulating closed-loop control system 100. During the process of treating a sodium chloride solution with a concentration of 15%, the feeding system 111 transports the solution to the double-effect evaporation system 112 at an initial flow rate of 15 m³ / h. The first-effect evaporator 1121 is heated to 100°C using external steam (pressure 0.4 MPa), and the second-effect evaporator 1122 is heated to 80°C using secondary steam. The concentrated solution is transported to the crystallization system 114 through the circulation pump 113 and cooled to 50°C to precipitate crystals. The data acquisition unit continuously collects the feeding flow rate (15 m³ / h), evaporation rate (4 m³ / h for the first effect, 3 m³ / h for the second effect), and load conditions (such as the steam supply pressure fluctuating to 0.35 MPa). The circulating closed-loop control system 100 dynamically adjusts the evaporation parameters of the first effect and the second-effect evaporator 1122 according to this data: when the load decreases (steam pressure drops to 0.35 MPa), the temperature of the first effect is adjusted to 98°C, and the flow rate is increased to 16 m³ / h to maintain the evaporation rate; when the load increases (feeding flow rate increases to 16 m³ / h), the inter-effect pressure difference is optimized from 0.06 MPa to 0.08 MPa, and the temperature of the second effect rises to 82°C. The adjustment is achieved through the frequency converter of the circulation pump 113 and the steam pipeline valve to ensure adaptation to different load conditions.

[0051] It can be understood that the intelligent flow rate regulation strategy enables the double-effect evaporation system 112 to operate efficiently under load fluctuations by dynamically adjusting the flow rate, temperature, and pressure difference, ensuring a stable evaporation process and reliable quality of the sodium chloride crystals produced by the crystallization system 114. The adaptability of the system is enhanced, and the energy consumption is utilized more reasonably, meeting the diverse requirements of industrialized concentration and crystallization.

[0052] The above description is only an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An intelligent dynamic flow rate regulation and double-effect crystallization evaporation device, comprising a feeding system, a double-effect evaporation system, a crystallization system, a circulation pump and a flow rate regulation system, characterized in that: The feeding system is connected to the double-effect evaporation system through a pipeline, the double-effect evaporation system is connected to the crystallization system through the circulation pump, and the flow rate regulation system is connected to the circulation pump and the double-effect evaporation system; the device realizes intelligent dynamic flow rate regulation through the above-mentioned circulation closed-loop control system, and synergistically optimizes the evaporation efficiency of the double-effect evaporation system and the crystallization quality of the crystallization system.

2. The device according to claim 1, characterized in that The closed-loop control system includes a data acquisition unit, which is installed on the pipeline connecting the feeding system and the double-effect evaporation system, the connection between the double-effect evaporation system and the crystallization system, and the scaling-prone parts through sensors to collect feed flow rate, evaporation rate, crystallization process parameters and scaling conditions in real time.

3. The device according to claim 2, characterized in that The double-effect evaporation system includes a first-effect evaporator and a first-effect evaporator 1122, the first-effect evaporator is connected to the second-effect evaporator through a steam pipe, and the second-effect evaporator is connected to the crystallization system through the circulating pump. The data acquisition unit is installed inside the first-effect evaporator and the second-effect evaporator and on the top of the crystallization system through sensors to collect the evaporation rates of the first-effect evaporator and the second-effect evaporator and the crystallization process parameters of the crystallization system.

4. The device according to claim 1, characterized in that The closed-loop control system includes a data processing unit, which calculates the optimal flow rate based on the feed flow rate, evaporation rate, crystallization process parameters and scaling provided by the data acquisition unit and in combination with historical data (Formula 1: ),in For the optimal flow rate, is the feed flow rate, T is the temperature, S is the supersaturation, is the pressure difference between the effective spaces.

5. The device according to claim 4, characterized in that The data processing unit includes a partition control unit and an inter-effect pressure difference optimization unit. The partition control unit calculates the local flow rate according to the evaporation rate and crystallization process parameters at the connection between the double-effect evaporation system and the crystallization system provided by the data acquisition unit. The inter-effect pressure difference optimization unit optimizes the pressure difference by adjusting the steam pipeline valve between the first-effect evaporator and the second-effect evaporator to support intelligent flow rate regulation to improve the double-effect evaporation efficiency.

6. The device according to claim 5, characterized in that The flow rate regulation system of the circulation closed-loop control system also includes a circulation pump speed control unit, a partition valve control unit and a disturbance flow rate control unit. The circulation pump speed control unit is connected to the circulation pump through an electrical signal. The partition valve control unit is installed on the pipeline connecting the double-effect evaporation system and the crystallization system through a valve. The disturbance flow rate control unit is connected to the pipeline at the part prone to scaling. The flow rate regulation system is dynamically adjusted according to the local flow rate calculated by the partition control unit to optimize the double-effect crystallization process.

7. The device according to claim 6, characterized in that The disturbance flow rate control unit periodically changes the flow rate to form micro-vortex or micro-oscillation effects according to the scaling conditions provided by the data acquisition unit to reduce crystal deposition, and coordinately adjusts the flow rate according to the optimization result of the inter-effect pressure difference optimization unit to improve the evaporation efficiency of the double-effect evaporation system.

8. The device according to claim 1, characterized in that The closed-loop control system includes a feedback optimization unit, which adaptively adjusts the flow rate strategy based on the long-term operation data of feed flow rate, evaporation rate, crystallization process parameters and scaling provided by the data acquisition unit, combined with machine learning optimization and scaling trend analysis (Formula 2: = ),in To predict the flow rate, is the historical flow rate, is the real-time flow rate, and is the weight coefficient.

9. The device according to claim 1, characterized in that The device includes an abnormal warning unit, which is connected to the double-effect evaporation system and the crystallization system through a data line, detects abnormalities according to the feed flow rate, evaporation rate, crystallization process parameters and scaling conditions provided by the data acquisition unit, and sends a warning signal when instability or an increasing scaling trend is detected.

10. The device according to claim 1, characterized in that The device realizes a double-effect crystallization evaporation optimization strategy with intelligent flow rate regulation through the circulating closed-loop control system, and dynamically adjusts the evaporation parameters of the first-effect evaporator and the second-effect evaporator of the double-effect evaporation system, including flow rate, temperature and pressure difference, according to the feed flow rate, evaporation rate and load conditions provided by the data acquisition unit, so as to adapt to efficient evaporation and crystallization under different load conditions.

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