A system for continuous in-out feed of a concentration plant

Abstract

The embodiment of the present application relates to concentration equipment, and discloses a system for continuous feeding and discharging of concentration equipment, comprising: a raw material supply unit comprising a raw material tank, a feeding pump and a feeding valve connected in sequence; a double-effect evaporation unit comprising a primary evaporator and a secondary evaporator connected in communication, the feeding end of the primary evaporator being connected in communication with the discharging end of the feeding valve to receive the material to be concentrated delivered by the raw material supply unit; the primary evaporator being provided with a first liquid level assembly for monitoring the liquid level inside the primary evaporator; a discharging unit comprising a densimeter arranged at the bottom of the secondary evaporator, a discharging pump and a first discharging valve connected in sequence with the secondary evaporator; and a control unit for adjusting the opening degree of the feeding valve according to the monitoring data of the first liquid level assembly to maintain the liquid level in the primary evaporator within a preset range; and for adjusting the opening degree of the first discharging valve according to the monitoring data of the densimeter to maintain the material density in the secondary evaporator within a set range, so as to realize continuous discharging.

Description

Technical Field

[0001] This application relates to the field of concentration equipment technology, and more particularly to a continuous feeding and discharging system for concentration equipment. Background Technology

[0002] Currently, evaporation and concentration equipment (including energy-saving concentration equipment) is widely used in material concentration processes in industrial production, but it generally adopts an intermittent feeding and discharging operation mode. Specifically, during normal operation, the material in the evaporation chamber needs to be maintained at a high temperature to ensure evaporation efficiency. When the material in the evaporation chamber decreases to a certain amount due to evaporation, low-temperature raw material needs to be added to the evaporation chamber. However, the injection of low-temperature material will directly disrupt the original stable temperature and pressure balance in the evaporation chamber, causing the temperature to drop and the pressure to fluctuate, which in turn causes a decrease or instability in the instantaneous evaporation rate of the equipment.

[0003] Meanwhile, when the density of the concentrate in the evaporation chamber reaches the set value and discharge is required, the discharge pump needs to be activated to expel the concentrate. The sudden activation of the discharge pump will impact the pressure inside the evaporation chamber, further exacerbating pressure fluctuations. This not only affects the instantaneous evaporation rate again but also leads to instability in the overall operation of the equipment. The aforementioned problems of temperature fluctuations, pressure fluctuations, evaporation rate fluctuations, and poor operational stability caused by intermittent feeding and discharging have become key bottlenecks restricting the continuous, efficient, and stable operation of evaporation and concentration equipment, failing to meet the demands of industrial continuous production for equipment operational stability and concentration efficiency. Utility Model Content

[0004] One object of this application is to provide a continuous feed and discharge system for a concentration device, which at least solves the above-mentioned problems.

[0005] To achieve the above objectives, some embodiments of this application provide a continuous feed and discharge system for a concentration device, comprising:

[0006] The raw material supply unit includes a raw material tank, a feed pump, and a feed valve connected in sequence;

[0007] The double-effect evaporation unit includes a first-effect evaporator and a second-effect evaporator connected in series. The feed end of the first-effect evaporator is connected to the discharge end of the feed valve to receive the material to be concentrated from the raw material supply unit. The first-effect evaporator is equipped with a first liquid level component for monitoring its internal liquid level.

[0008] The discharge unit includes a densitometer located at the bottom of the double-effect evaporator, a discharge pump connected in sequence to the double-effect evaporator, and a first discharge valve;

[0009] The control unit is used to adjust the opening of the feed valve according to the monitoring data of the first liquid level component to maintain the liquid level in the first-effect evaporator within a preset range; it is also used to adjust the opening of the first discharge valve according to the monitoring data of the densitometer to maintain the material density in the second-effect evaporator within a set range, so as to achieve continuous discharge.

[0010] Compared with related technologies, the solution provided in this application embodiment, by adjusting the opening of the feed valve based on the monitoring data of the first liquid level component by the control unit, can match the replenishment amount and instantaneous evaporation amount of the first-effect evaporator in real time, so that the liquid level in the first-effect evaporator is kept stable within the preset range, avoiding liquid level fluctuations caused by intermittent feeding, thereby preventing changes in temperature and pressure in the evaporation chamber due to liquid level fluctuations, ensuring stable evaporation of the first-effect evaporator, and improving the operational stability of the equipment; in addition, by adjusting the opening of the first discharge valve based on the monitoring data of the densitometer by the control unit, the discharge amount of the second-effect evaporator can be controlled in real time, so that the material density in the second-effect evaporator is always maintained within the set range, realizing continuous discharge, avoiding liquid level and pressure fluctuations in the second-effect evaporator caused by the sudden start of the discharge pump during intermittent discharge, ensuring stable evaporation of the second-effect evaporator, and further ensuring the continuous and stable operation of the entire equipment. Attached Figure Description

[0011] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0012] Figure 1 This is a schematic diagram of the system framework provided in the embodiments of this disclosure.

[0013] Figure label:

[0014] 1: Raw material tank; 2: Feed pump; 3: Flow meter; 4: Feed valve; 5: First-effect evaporator; 51: First discharge section of the first-effect evaporator; 52: Second discharge section of the first-effect evaporator; 6: Second-effect evaporator; 61: First discharge section of the second-effect evaporator; 7: First upper level gauge; 8: First lower level gauge; 9: Discharge valve; 10: Second upper level gauge; 11: Second lower level gauge; 12: Density meter; 13: Second discharge valve; 14: Discharge pump; 15: First discharge valve; 16: First drain valve; 17: Second drain valve; 18: Storage tank. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0017] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0018] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0019] Unless otherwise stated, the term "multiple" means two or more.

[0020] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0021] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0023] Combination Figure 1 As shown in the embodiments of this disclosure, a continuous feeding and discharging system for a concentration device includes: a raw material supply unit, a double-effect evaporation unit, a discharge unit, and a control unit.

[0024] The raw material supply unit includes a raw material tank 1, a feed pump 2, and a feed valve 4 connected in sequence; the double-effect evaporation unit includes a first-effect evaporator 5 and a second-effect evaporator 6 connected in series. The feed end of the first-effect evaporator 5 is connected to the discharge end of the feed valve 4 to receive the material to be concentrated from the raw material supply unit; the first-effect evaporator 5 is equipped with a first liquid level component for monitoring its internal liquid level; the discharge unit includes a densitometer 12 located at the bottom of the second-effect evaporator 6, a discharge pump 14, and a first discharge valve 15 connected in sequence to the second-effect evaporator 6; the control unit is used to adjust the opening of the feed valve 4 according to the monitoring data of the first liquid level component to maintain the liquid level in the first-effect evaporator 5 within a preset range; it is also used to adjust the opening of the first discharge valve 15 according to the monitoring data of the densitometer 12 to maintain the material density in the second-effect evaporator 6 within a set range, thereby achieving continuous discharge.

[0025] In this embodiment, the material to be concentrated in the raw material tank 1 is transported to the feed valve 4 by the feed pump 2, and then enters the first-effect evaporator 5 through the feed valve 4; after the material in the first-effect evaporator 5 is concentrated, it enters the second-effect evaporator 6 for further concentration; the concentrated material in the second-effect evaporator 6 that has reached the set density is discharged through the discharge pump 14 and the first discharge valve 15.

[0026] The continuous feeding and discharging system for a concentration device provided in this embodiment of the invention, through the control unit adjusting the opening of the feed valve 4 based on the monitoring data of the first liquid level component, can match the replenishment amount and instantaneous evaporation amount of the first-effect evaporator 5 in real time, so that the liquid level in the first-effect evaporator 5 is kept stable within a preset range, avoiding liquid level fluctuations caused by intermittent feeding, thereby preventing changes in temperature and pressure in the evaporation chamber due to liquid level fluctuations, ensuring stable evaporation of the first-effect evaporator 5, and improving the operational stability of the equipment; in addition, by using the control unit to adjust the opening of the first discharge valve 15 based on the monitoring data of the densitometer 12, the discharge amount of the second-effect evaporator 6 can be controlled in real time, so that the material density in the second-effect evaporator 6 is always maintained within a set range, realizing continuous discharge, avoiding liquid level and pressure fluctuations in the second-effect evaporator 6 caused by the sudden start of the discharge pump 14 during intermittent discharge, ensuring stable evaporation of the second-effect evaporator 6, and further ensuring the continuous and stable operation of the entire equipment.

[0027] Optionally, the first liquid level component includes: a first upper liquid level gauge 7 disposed on the first-effect evaporator 5; a first lower liquid level gauge 8 disposed on the first discharge section 51 extending coaxially from the bottom of the first-effect evaporator 5; wherein, the control unit obtains the real-time liquid level in the first-effect evaporator 5 through the monitoring data of the first upper liquid level gauge 7 and the first lower liquid level gauge 8, and calculates the real-time replenishment amount required by the first-effect evaporator 5. When the real-time liquid level is too high, the control unit controls the feed valve 4 to reduce the opening degree; when the real-time liquid level is too low, the control unit controls the feed valve 4 to increase the opening degree.

[0028] The first upper level gauge 7 and the first lower level gauge 8 work together to accurately monitor the liquid level at different heights in the first-effect evaporator 5. Based on the data from both gauges, the control unit can accurately calculate the real-time liquid level of the first-effect evaporator 5 and the required replenishment amount, providing a precise basis for adjusting the opening of the feed valve 4. When the real-time liquid level in the first-effect evaporator 5 is too high, the control unit controls the feed valve 4 to reduce the opening and decrease the amount of material entering; when the real-time liquid level is too low, the control unit controls the feed valve 4 to increase the opening and increase the amount of material entering. This precise adjustment method can more efficiently maintain the liquid level in the first-effect evaporator 5 within the preset range, further reducing the impact of liquid level fluctuations on the temperature, pressure, and evaporation rate of the first-effect evaporator 5, and improving the operational stability of the first-effect evaporator 5.

[0029] For example, when the real-time liquid level is higher than the preset liquid level midpoint (the midpoint between the reference values ​​of the first upper liquid level gauge 7 and the first lower liquid level gauge 8), it indicates that the current real-time liquid level is too high, the theoretical replenishment amount is less than the evaporation amount, and the feed valve 4 needs to be controlled to reduce its opening; when the real-time liquid level is lower than the preset liquid level midpoint (the midpoint between the reference values ​​of the first upper liquid level gauge 7 and the first lower liquid level gauge 8), it indicates that the current real-time liquid level is too low, the theoretical replenishment amount is greater than the evaporation amount, and the feed valve 4 needs to be controlled to increase its opening; when the real-time liquid level is equal to the preset liquid level midpoint (the midpoint between the reference values ​​of the first upper liquid level gauge 7 and the first lower liquid level gauge 8), it indicates that the liquid level is normal, and the replenishment amount needs to match the instantaneous evaporation amount.

[0030] Optionally, the raw material supply unit further includes: a flow meter 3, located on the pipeline between the feed pump 2 and the feed valve 4, and electrically connected to the control unit; the flow meter 3 is used to monitor the amount of material entering the first-effect evaporator 5 in real time, and transmit the monitoring data to the control unit. The control unit combines the monitoring data of the flow meter 3 with the calculated replenishment amount, and adjusts the opening of the feed valve 4 for the second time, so that the instantaneous evaporation of the first-effect evaporator 5 matches the replenishment amount, and maintains the liquid level in the first-effect evaporator 5 within the preset range.

[0031] The material in the raw material tank 1 is transported to the flow meter 3 by the feed pump 2. After the flow meter 3 monitors the amount of material, the material enters the feed valve 4 and then enters the first-effect evaporator 5 through the feed valve 4.

[0032] The flow meter 3 monitors the actual amount of material entering the first-effect evaporator 5 in real time and transmits the data to the control unit. The control unit can compare the actual feed amount with the calculated replenishment amount to achieve secondary adjustment of the opening of the feed valve 4.

[0033] This embodiment uses a secondary adjustment mechanism to correct possible calculation deviations or fluctuations in the material conveying process, so that the instantaneous evaporation rate and liquid replenishment rate of the first-effect evaporator 5 are more accurately matched, further ensuring that the liquid level in the first-effect evaporator 5 is stable within the preset range, and minimizing the impact of liquid level fluctuations on the operating parameters and evaporation rate of the first-effect evaporator 5.

[0034] For example, the control unit monitors the real-time liquid level of the first-effect evaporator 5 through the first upper liquid level gauge 7 and the first lower liquid level gauge 8, compares the liquid level deviation with the preset liquid level midpoint, and calculates the theoretical liquid replenishment amount required to maintain the liquid level stability by combining the instantaneous evaporation reference value (if the liquid level is too low, the theoretical liquid replenishment amount is greater than the evaporation amount; if the liquid level is too high, the theoretical liquid replenishment amount is less than the evaporation amount).

[0035] The flow meter 3 collects the actual feed rate into the single-effect evaporator 5 in real time and transmits the data to the control unit.

[0036] The control unit compares the theoretical replenishment volume with the actual feed volume monitored by flow meter 3 and calculates the difference between the two:

[0037] If the actual feed rate is less than the theoretical replenishment rate (e.g., theoretically 1.2m³), 3 / h, actually only 1.0m 3 / h): The control unit adjusts the feed rate according to the preset "feed rate difference - opening adjustment coefficient" (e.g., every 0.2m difference). 3 / h corresponds to an increase of 10% opening), increase the opening of the feed valve 4, and increase the actual feed rate;

[0038] If the actual feed rate is greater than the theoretical replenishment rate (e.g., theoretically 1.2m³), 3 / h, actually reaching 1.4m 3 / h): The control unit reduces the opening of the feed valve 4 according to the above coefficient, thus reducing the actual feed amount;

[0039] Repeat the above "monitoring-comparison-adjustment" process until the actual feed rate matches the theoretical replenishment rate, ensuring that the instantaneous evaporation rate of the first-effect evaporator 5 matches the replenishment rate and the liquid level is maintained within the preset range.

[0040] Optionally, the double-effect evaporation unit further includes: a discharge valve 9 located on the pipeline between the first-effect evaporator 5 and the second-effect evaporator 6; and a second liquid level component located on the second-effect evaporator 6 for monitoring the liquid level. The discharge valve 9 and the second liquid level component are both electrically connected to the control unit. The control unit adjusts the opening of the discharge valve 9 according to the monitoring data of the second liquid level component to maintain the liquid level in the second-effect evaporator 6 within a set range, and the opening of the discharge valve 9 is negatively correlated with the liquid level height monitored by the second liquid level component.

[0041] The material in the first-effect evaporator 5 enters the second-effect evaporator 6 through the discharge valve 9. After the material in the second-effect evaporator 6 is concentrated, it is discharged through the discharge unit. The control unit adjusts the opening of the discharge valve 9 according to the data of the second liquid level component to control the amount of material entering the second-effect evaporator 6.

[0042] The second liquid level component monitors the liquid level of the double-effect evaporator 6 in real time. The control unit adjusts the opening of the discharge valve 9 according to the monitoring data. The opening of the discharge valve 9 is negatively correlated with the liquid level. That is, the opening is reduced when the liquid level is too high and increased when the liquid level is too low. This can accurately control the amount of material entering the double-effect evaporator 6, so that the replenishment amount of the double-effect evaporator 6 matches the instantaneous evaporation amount, and maintain the liquid level in the double-effect evaporator 6 within the set range.

[0043] This embodiment avoids temperature and pressure changes caused by liquid level fluctuations in the double-effect evaporator 6, ensuring stable evaporation capacity of the double-effect evaporator 6, and laying a stable liquid level foundation for continuous discharge of the double-effect evaporator 6 in the future.

[0044] Optionally, the second liquid level component includes: a second upper liquid level gauge 10 disposed in the double-effect evaporator 6; and a second lower liquid level gauge 11 disposed in the first discharge section 61 extending coaxially from the bottom of the double-effect evaporator 6. The control unit obtains the real-time liquid level in the double-effect evaporator 6 through the monitoring data of the second upper liquid level gauge 10 and the second lower liquid level gauge 11, and calculates the real-time replenishment amount required for the double-effect evaporator 6 (the amount of material that needs to enter the double-effect evaporator 6 from the first-effect evaporator 5 through the discharge valve 9 per unit time). When the real-time liquid level is too high, the control unit controls the discharge valve 9 to reduce its opening; when the real-time liquid level is too low, the control unit controls the discharge valve 9 to increase its opening.

[0045] The second upper level gauge 10 and the second lower level gauge 11 monitor the liquid level at different heights in the double-effect evaporator 6. The control unit combines the data from both gauges to accurately calculate the real-time liquid level of the double-effect evaporator 6 and the required replenishment volume, providing data support for adjusting the opening of the discharge valve 9. Based on the calculation results, the control unit adjusts the opening of the discharge valve 9, which can more accurately control the amount of material entering the double-effect evaporator 6, ensuring that the liquid level in the double-effect evaporator 6 is stably controlled within the set range. This further reduces the interference of liquid level fluctuations on the temperature, pressure, and evaporation rate of the double-effect evaporator 6, improves the operational stability of the double-effect evaporator 6, and ensures a smoother subsequent continuous discharge process.

[0046] For example, when the real-time liquid level is higher than the preset liquid level midpoint (the midpoint between the reference values ​​of the second upper liquid level gauge 10 and the second lower liquid level gauge 11), it indicates that the current real-time liquid level is too high, the theoretical replenishment amount is less than the evaporation amount, and the discharge valve 9 needs to be controlled to reduce its opening; when the real-time liquid level is lower than the preset liquid level midpoint (the midpoint between the reference values ​​of the second upper liquid level gauge 10 and the second lower liquid level gauge 11), it indicates that the current real-time liquid level is too low, the theoretical replenishment amount is greater than the evaporation amount, and the discharge valve 9 needs to be controlled to increase its opening; when the real-time liquid level is equal to the preset liquid level midpoint (the midpoint between the reference values ​​of the second upper liquid level gauge 10 and the second lower liquid level gauge 11), it indicates that the liquid level is normal, and the replenishment amount needs to match the instantaneous evaporation amount.

[0047] Optionally, it also includes: a drain unit, including a first drain valve 16 and a second drain valve 17 respectively located at the bottom of the first-effect evaporation chamber and the second-effect evaporation chamber, for draining material residue in the first-effect evaporation chamber and the second-effect evaporation chamber; wherein the first drain valve 16 and the second drain valve 17 are both electrically connected to the control unit.

[0048] During normal system operation, the material to be concentrated in raw material tank 1 is pumped to feed valve 4 by feed pump 2, and then enters the first-effect evaporator 5 through feed valve 4. After concentration in the first-effect evaporator 5, the material enters the second-effect evaporator 6 for further concentration. The concentrated material in the second-effect evaporator 6 that has reached the set density is discharged through discharge pump 14 and first discharge valve 15. After the system has finished working, the material in the first and second-effect evaporators 6 is discharged first, and then the residual material is discharged through the first drain valve 16 and second drain valve 17.

[0049] The first drain valve 16 and the second drain valve 17 correspond to the first-effect evaporator 5 and the second-effect evaporator 6, respectively, and are both electrically connected to the control unit, which facilitates the control unit to uniformly control the drain process and realize the automation of draining.

[0050] After the system has finished working, by opening the first drain valve 16 and the second drain valve 17, all material residue in the bottom of the first-effect evaporator 5 and the second-effect evaporator 6 and related pipes can be completely drained, avoiding the accumulation and scaling of residual material in the equipment, which would affect the operating efficiency of subsequent equipment and the quality of concentrated material. At the same time, it reduces the difficulty of cleaning the equipment and extends the service life of the equipment.

[0051] Optionally, the first drain valve 16 is located in the first discharge section 51 of the first-effect evaporator 5, and the discharge valve 9 is located in the second discharge section 52 of the first-effect evaporator; wherein, the connection between the second discharge section 52 of the first-effect evaporator and the first discharge section 51 of the first-effect evaporator is located between the first lower level gauge 8 and the first drain valve 16.

[0052] The material that has undergone preliminary concentration in the first-effect evaporator 5 is conveyed to the discharge valve 9 through the second discharge section 52. After being regulated by the discharge valve 9, it enters the second-effect evaporator 6, realizing continuous material transfer between the two-effect evaporation units.

[0053] After the system completes the concentration operation, the material residue in the first-effect evaporator 5 is transported to the first drain valve 16 through the first discharge section 51 and finally discharged through the first drain valve 16. The connection between the second discharge section 52 and the first discharge section 51 of the first-effect evaporator is limited to the area between the first lower level gauge 8 and the first drain valve 16, so that the two material flow paths are independent of each other in the key monitoring area (near the first lower level gauge 8).

[0054] During normal operation, the material in the discharge path only flows through the second discharge section 52 and the first discharge section 51 above the connecting point, and will not enter the downstream area where the drain valve is located. During draining, the residual material only flows through the first discharge section 51 below the connecting point, and will not flow back into the second discharge section 52 or interfere with the discharge path. In this way, the mutual interference between the discharge and draining operations is eliminated, which not only avoids the waste caused by material entering the drain valve during normal discharge, but also prevents residual material from entering the double-effect evaporator 6 during draining and affecting the concentration quality.

[0055] Understandably, the material conveying (discharging) and cleaning (drainage) pipelines of the first-effect evaporator 5 are functionally zoned: the second discharge section 52 focuses on material conveying, and the first discharge section 51 focuses on residue cleaning, making the pipeline functions clear and distinct. During routine equipment maintenance, targeted inspections can be performed on pipelines and valves with different functions (e.g., the discharge valve 9 focuses on the opening adjustment accuracy, and the drain valve focuses on sealing performance), reducing maintenance difficulty.

[0056] Optionally, the first discharge valve 15 and the second drain valve 17 are both located at the discharge end of the first discharge section 61 of the double-effect evaporator, and the first discharge valve 15 and the second drain valve 17 are arranged in parallel.

[0057] The first discharge valve 15 and the second drain valve 17 are connected in parallel at the discharge end of the first discharge section 61 of the double-effect evaporator, allowing normal discharge and drain operations to be carried out independently without affecting each other. During normal discharge, the second drain valve 17 is closed and the first discharge valve 15 is opened to ensure smooth discharge of concentrated material; during drain operation, the first discharge valve 15 is closed and the second drain valve 17 is opened to ensure complete removal of residual material. Optionally, the system also includes a storage tank 18, connected to the first discharge valve 15, to receive the concentrated material discharged from the first discharge valve 15.

[0058] The concentrated material that reaches the set density in the double-effect evaporator 6 is then pumped by the discharge pump 14 and the first discharge valve 15 before entering the storage tank 18 for storage. The storage tank 18 is connected to the first discharge valve 15 and can receive the concentrated material discharged from the double-effect evaporator 6 in real time, avoiding the inability of the equipment to continuously discharge due to a lack of storage space for the concentrated material, and ensuring the smooth operation of the continuous discharge process.

[0059] Meanwhile, the storage tank 18 can centrally store the concentrated material, which facilitates the unified processing, transportation or use of the concentrated material in the future, improves the continuity and convenience of the entire concentration production process, and meets the needs of continuous industrial production.

[0060] Optionally, it also includes: a second discharge valve 13, which is connected to the input end of the discharge pump 14 and is set in parallel with the second drain valve 17; when the material density monitored by the densitometer 12 reaches the set value, the control unit controls the second discharge valve 13 and the discharge pump 14 to open, and maintains the material density in the double-effect evaporator 6 within the set range by adjusting the opening degree of the first discharge valve 15, so as to achieve continuous discharge; when draining, the control unit controls the second discharge valve 13 to close and the second drain valve 17 to open, so as to drain the residual material in the double-effect evaporator 6.

[0061] During normal discharge, the material in the double-effect evaporator 6 is discharged through the second discharge valve 13, the discharge pump 14, and the first discharge valve 15; during sewage discharge, the residual material in the double-effect evaporator 6 is discharged through the second sewage discharge valve 17.

[0062] The second discharge valve 13 is connected to the input end of the discharge pump 14 and is connected in parallel with the second drain valve 17. During normal discharge, the control unit controls the second discharge valve 13 and the discharge pump 14 to open. By adjusting the opening of the first discharge valve 15, the material density in the double-effect evaporator 6 is kept stable, so as to achieve continuous discharge and ensure that the concentrated material is discharged stably as required. During draining, the control unit controls the second discharge valve 13 to close and the second drain valve 17 to open, so as to completely drain the residual material in the double-effect evaporator 6 and avoid the residual material from affecting subsequent production.

[0063] Optionally, the control unit is a PLC controller. The PLC controller uses a preset control program to achieve automated control of the raw material supply unit, double-effect evaporation unit, discharge unit, and sewage discharge unit, ensuring continuous and stable operation of the system.

[0064] Optionally, in the double-effect evaporation unit, both the first-effect evaporator 5 and the second-effect evaporator 6 are equipped with temperature monitoring components. The temperature monitoring components include at least two temperature sensors, which are used to collect the temperature data of the materials in the first-effect evaporator 5 and the second-effect evaporator 6 in real time. The system also includes a temperature feedback regulation module, which is electrically connected to the temperature sensors, the feed valve 4, and the discharge valve 9. When the temperature in the first-effect evaporator 5 is lower than the first preset temperature value, the temperature feedback regulation module controls the opening of the feed valve 4 to decrease to reduce the feed rate. When the temperature in the first-effect evaporator 5 is higher than the second preset temperature value, the module controls the opening of the feed valve 4 to increase to increase the feed rate. When the temperature in the second-effect evaporator 6 is lower than the third preset temperature value, the module controls the opening of the discharge valve 9 to decrease to reduce the feed rate. When the temperature in the second-effect evaporator 6 is higher than the fourth preset temperature value, the module controls the opening of the discharge valve 9 to increase to increase the feed rate. The first, second, third, and fourth preset temperature values ​​are all within the temperature threshold range for normal operation of the corresponding evaporators.

[0065] Optionally, the system also includes a liquid level anomaly protection module, which is electrically connected to the first liquid level component, the second liquid level component, and the system's emergency shutdown device. When the first liquid level component detects that the liquid level in the first-effect evaporator 5 is higher than the first safe liquid level upper limit or lower than the first safe liquid level lower limit, the liquid level anomaly protection module triggers the emergency shutdown device to stop the operation of the feed pump 2 and the discharge valve 9. When the second liquid level component detects that the liquid level in the second-effect evaporator 6 is higher than the second safe liquid level upper limit or lower than the second safe liquid level lower limit, the liquid level anomaly protection module triggers the emergency shutdown device to stop the operation of the discharge valve 9 and the discharge pump 14.

[0066] Optionally, the liquid level abnormality protection module also includes an alarm unit. When the liquid level is detected to be outside the safe liquid level range, the alarm unit will simultaneously issue an audible and visual alarm signal. The type of alarm signal varies depending on the degree of liquid level abnormality. The greater the difference between the liquid level and the safe liquid level range, the stronger the alarm signal.

[0067] Optionally, the densitometer 12 is an online density sensor, and at least two densitometers 12 are provided in the double-effect evaporator 6. The two densitometers 12 are respectively located at different heights in the double-effect evaporator 6. The control unit of the system receives the monitoring data of the two densitometers 12 and calculates the average value. When the average value reaches the preset density value, the control unit controls the second discharge valve 13, the discharge pump 14, and the first discharge valve 15 to start working. When the difference between the monitoring data of the two densitometers 12 is greater than the preset density deviation threshold, the control unit issues a densitometer 12 fault warning signal.

[0068] Optionally, the control unit is also equipped with a density compensation algorithm. When the temperature inside the double-effect evaporator 6 changes, the control unit corrects the monitoring data of the density meter 12 based on the temperature data collected by the temperature monitoring component, so as to eliminate the influence of temperature change on the density measurement results.

[0069] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims, and the foregoing embodiments should be considered exemplary and non-limiting.

Claims

1. A continuous feeding and discharging system for a concentration device, characterized in that, include: The raw material supply unit includes a raw material tank, a feed pump, and a feed valve connected in sequence; The double-effect evaporation unit includes a first-effect evaporator and a second-effect evaporator connected in series. The feed end of the first-effect evaporator is connected to the discharge end of the feed valve to receive the material to be concentrated from the raw material supply unit. The first-effect evaporator is equipped with a first liquid level component for monitoring its internal liquid level. The discharge unit includes a densitometer located at the bottom of the double-effect evaporator, a discharge pump connected in sequence to the double-effect evaporator, and a first discharge valve; The control unit is used to adjust the opening of the feed valve according to the monitoring data of the first liquid level component to maintain the liquid level in the first-effect evaporator within a preset range; it is also used to adjust the opening of the first discharge valve according to the monitoring data of the densitometer to maintain the material density in the second-effect evaporator within a set range, so as to achieve continuous discharge.

2. The system according to claim 1, characterized in that, The first liquid level assembly includes: The first upper liquid level gauge is installed on the first-effect evaporator; The first lower liquid level gauge is installed at the first discharge section, which extends coaxially from the bottom of the first-effect evaporator. The control unit obtains the real-time liquid level in the first-effect evaporator through the monitoring data of the first upper liquid level gauge and the first lower liquid level gauge, and calculates the real-time replenishment amount required by the first-effect evaporator. When the real-time liquid level is too high, the control unit controls the feed valve to reduce its opening; when the real-time liquid level is too low, the control unit controls the feed valve to increase its opening.

3. The system according to claim 2, characterized in that, The raw material supply unit also includes: The flow meter is located on the pipeline between the feed pump and the feed valve and is electrically connected to the control unit. The flow meter is used to monitor the amount of material entering the first-effect evaporator in real time and transmit the monitoring data to the control unit. The control unit combines the monitoring data of the flow meter with the calculated replenishment amount and adjusts the opening of the feed valve a second time to match the instantaneous evaporation of the first-effect evaporator with the replenishment amount, so as to maintain the liquid level in the first-effect evaporator within the preset range.

4. The system according to any one of claims 1 to 3, characterized in that, The dual-effect evaporation unit also includes: The discharge valve is located on the pipeline between the first-effect evaporator and the second-effect evaporator; The second liquid level component is installed on the double-effect evaporator and is used to monitor the liquid level; The discharge valve and the second liquid level component are both electrically connected to the control unit. The control unit adjusts the opening of the discharge valve according to the monitoring data of the second liquid level component to maintain the liquid level in the double-effect evaporator within the set range. The opening of the discharge valve is negatively correlated with the liquid level height monitored by the second liquid level component.

5. The system according to claim 4, characterized in that, The second liquid level assembly includes: The second upper liquid level gauge is installed on the double-effect evaporator; The second lower liquid level gauge is installed at the first discharge section, which extends coaxially from the bottom of the double-effect evaporator. The control unit obtains the real-time liquid level in the double-effect evaporator through the monitoring data of the second upper liquid level gauge and the second lower liquid level gauge, and calculates the real-time liquid replenishment required by the double-effect evaporator. When the real-time liquid level is too high, the control unit controls the discharge valve to reduce its opening; when the real-time liquid level is too low, the control unit controls the discharge valve to increase its opening.

6. The system according to claim 4, characterized in that, Also includes: The sewage discharge unit includes a first sewage discharge valve and a second sewage discharge valve respectively located at the bottom of the first-effect evaporation chamber and the second-effect evaporation chamber, for discharging material residues in the first-effect evaporation chamber and the second-effect evaporation chamber; Both the first and second drain valves are electrically connected to the control unit.

7. The system according to claim 6, characterized in that, The first drain valve is located in the first discharge section of the first-effect evaporator, and the discharge valve is located in the second discharge section of the first-effect evaporator. The connection between the second discharge section of the first-effect evaporator and the first discharge section of the first-effect evaporator is located between the first lower level gauge and the first drain valve.

8. The system according to claim 6, characterized in that, The first discharge valve and the second drain valve are both located at the discharge end of the first discharge section of the double-effect evaporator, and the first discharge valve and the second drain valve are connected in parallel.

9. The system according to claim 1, characterized in that, Also includes: The storage tank is connected to the first discharge valve to receive the concentrated material discharged from the first discharge valve.

10. The system according to claim 1, characterized in that, Also includes: The second discharge valve is connected to the input end of the discharge pump and is set in parallel with the second drain valve; When the density of the material monitored by the densitometer reaches the set value, the control unit controls the second discharge valve and the discharge pump to open, and maintains the material density in the double-effect evaporator within the set range by adjusting the opening of the first discharge valve, so as to achieve continuous discharge. When draining, the control unit controls the second discharge valve to close and the second drain valve to open, so as to drain the residual material in the double-effect evaporator.

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