Anti-blocking light salt brine concentrating and recycling system
By introducing a condensate reflux flushing unit into the multi-effect evaporation concentration system, the problem of heat exchanger blockage caused by salt precipitation in concentrated brine was solved, and efficient utilization of brine and reuse of energy were achieved.
Patent Information
- Application Number
- CN202422368951.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-09-27
AI Technical Summary
During the process of concentrating and reusing light brine in a multi-effect brine evaporation and concentration system, salt precipitation in the concentrated brine can cause blockage of the terminal heat exchanger.
A multi-effect evaporation concentration unit and a condensate reflux flushing unit are used, and the condensate is used to flush the multi-effect evaporation concentration unit to prevent salt crystals from precipitating and re-melting, thereby solving the problem of heat exchanger blockage.
It effectively prevents heat exchanger blockage, improves the utilization rate of brine, reduces raw salt consumption, and reduces heat energy consumption.
Smart Images
Figure CN223304203U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of brine concentration equipment, in particular to an anti-clogging light brine concentration and reuse system. Background Art
[0002] The primary raw material for electrolytic caustic soda production is sodium chloride aqueous solution. With the development of underground rock salt and brine, the production of sodium chloride aqueous solution is no longer limited to sea salt. To reduce production costs, most alkali producers refine the components of the extracted brine to produce process brine, using it instead of sea salt for caustic soda production. Specifically, the brine is electrolyzed in an electrolysis system, dechlorinated and denitrified, and then returned to the salting process. Brine or primary brine is then added to the system, and the solid raw salt is re-dissolved and refined again before entering the electrolytic cell for electrolysis to produce caustic soda, repeating the cycle. This method requires a large circulation volume of fresh brine, a low brine dosage, and high raw salt consumption, resulting in high production costs.
[0003] Currently, to reduce production costs and raw salt consumption, companies are concentrating dechlorinated brine for reuse, thereby reducing the amount of raw salt used in the primary brine stage of the salt production process. In the alkali industry, utilizing steam as the heat source for concentration is more convenient. Therefore, concentrated brine is often achieved using an evaporation concentration system, utilizing steam heat to concentrate the brine. For example, patent CN215136949U discloses a multi-effect brine evaporation concentration system for ion-exchange membrane electrolysis. The evaporator is composed of multiple single-effect evaporators. The effect connected to the boiler's steam line is generally referred to as the first-effect evaporator, followed by the second, third, and so on. The secondary steam generated by the previous evaporator is introduced into the next evaporator for heating. Finally, the flashed secondary steam is passed into a vacuum system for processing. Therefore, boiler steam only needs to be introduced into the first effect, and subsequent evaporations utilize the secondary steam generated by the previous evaporator, thus reusing energy. Finally, the condensate, after cooling, is transported to a discharge zone.
[0004] The aforementioned multi-effect brine evaporation and concentration system, through the repeated use of secondary steam, improves the utilization rate of desalinated brine, reduces the consumption of raw salt in the primary brine process, and effectively reduces heat energy consumption, thus conserving system energy. However, in actual production, when the multi-effect brine evaporation and concentration system is used for brine concentration, salt crystals may precipitate due to the high brine concentration in the terminal heat exchanger after concentration, causing blockage of the terminal heat exchanger. Therefore, when the multi-effect brine evaporation and concentration system is used to concentrate desalinated brine for reuse, it is necessary to solve the problem of salt crystallization in the concentrated brine, which causes blockage of the terminal heat exchanger. Utility Model Content
[0005] The purpose of the utility model is to provide a blockage-proof desalinated brine concentration and reuse system to solve the problem proposed in the above background technology that when a multi-effect brine evaporation and concentration system is used to concentrate and reuse desalinated brine, salt in the brine after the concentrated salt is separated out, causing blockage of the terminal heat exchanger.
[0006] To achieve the above objectives, the present invention provides the following technical solutions:
[0007] A blockage-resistant salt water concentration and reuse system comprises a multi-effect evaporation concentration unit and a condensate reflux flushing unit;
[0008] The multi-effect evaporation concentration unit is provided with a brine feed port, a brine discharge port, a steam inlet and a secondary steam outlet, wherein the brine feed port is connected to the electrolysis system, the brine discharge port is connected to the primary brine section, the steam inlet is connected to the steam system, and the secondary steam outlet is connected to the vacuum system;
[0009] The multi-effect evaporation concentration unit is also provided with a steam condensate outlet and a condensate reflux port;
[0010] The condensate reflux flushing unit includes a condensate reflux collection tank and a condensate reflux pipeline. The water inlet of the condensate reflux collection tank is connected to the steam condensate outlet of the multi-effect evaporation concentration unit; the water outlet of the condensate collection tank is connected to the condensate reflux port of the multi-effect evaporation concentration unit through the condensate reflux pipeline.
[0011] Furthermore, a first branch pipe and a second branch pipe are provided in parallel at the water inlet of the condensate reflux collection tank, the water inlet of the condensate reflux collection tank is connected to the steam condensate outlet through the first branch pipe, and the water inlet of the condensate reflux collection tank is connected to the vacuum system through the second branch pipe.
[0012] Furthermore, a reflux valve is provided on the condensate reflux pipeline.
[0013] Furthermore, a condensate washing pump is provided on the condensate reflux pipeline, and the condensate washing pump and the reflux valve are provided in sequence.
[0014] Furthermore, it also includes a flow monitoring device, which is arranged on a pipeline connecting the multi-effect evaporation concentration unit and the primary brine section.
[0015] Furthermore, the multi-effect evaporation concentration unit is a triple-effect evaporator, which includes an I-effect evaporator, a II-effect evaporator and a III-effect evaporator, and the I-effect evaporator, the II-effect evaporator and the III-effect evaporator are all provided with a brine feed port, a brine discharge port, a steam inlet and a secondary steam outlet;
[0016] The brine feed port of the first-effect evaporator, the brine discharge port of the second-effect evaporator, the brine feed port of the second-effect evaporator and the brine discharge port of the third-effect evaporator are connected in series in sequence; the brine feed port of the third-effect evaporator is connected to the electrolyzed water system, and the brine discharge port of the first-effect evaporator is connected to the primary brine section;
[0017] The secondary steam outlet of the I-effect evaporator, the steam inlet of the II-effect evaporator, the secondary steam outlet of the II-effect evaporator and the steam inlet of the III-effect evaporator are connected in series in sequence; the steam inlet of the I-effect evaporator is connected to the steam system, and the secondary steam outlet of the III-effect evaporator is connected to the vacuum system;
[0018] The I-effect evaporator is provided with a steam condensate outlet and a condensate reflux port; the steam condensate outlet is communicated with the water inlet of the condensate reflux collection tank, and the condensate reflux port is communicated with the water outlet of the condensate collection tank through a condensate reflux pipeline.
[0019] Furthermore, the first-effect evaporator is a rising film evaporator.
[0020] Furthermore, the rising film evaporator is a forced circulation evaporator.
[0021] Furthermore, both the II-effect evaporator and the III-effect evaporator are falling film evaporators.
[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: it includes a multi-effect evaporation concentration unit and a condensate reflux flushing unit; the multi-effect evaporation concentration unit uses steam to concentrate the light brine, and reuses the concentrated brine to the primary brine section, thereby reducing the consumption of raw salt in the primary brine section and effectively reducing heat energy consumption; the condensate reflux flushing unit collects the steam condensate generated by the multi-effect evaporation concentration unit, and returns the steam condensate to the multi-effect evaporation concentration unit; when the terminal heat exchanger is blocked, the condensate is used to flush the multi-effect evaporation concentration unit to melt the precipitated salt crystals again, thereby solving the problem of blockage of the terminal heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic diagram of the structure of the utility model;
[0024] Among them, 1-I effect evaporator, 11-evaporation chamber, 12-preheater, 13-forced circulation pump, 2-II effect evaporator, 3-III effect evaporator, 4-condensate reflux collection tank, 5-steam condensate collection tank, 6-heat exchanger, 61-first heat exchanger, 62-second heat exchanger, 63-third heat exchanger, 64-fourth heat exchanger, 7-salt water storage tank. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention, but the present invention is not limited to the implementation methods described below.
[0026] Example
[0027] See also Figure 1 This embodiment provides an anti-clogging brine concentration and reuse system, including a multi-effect evaporation concentration unit and a condensate reflux flushing unit.
[0028] The multi-effect evaporation concentration unit is provided with a brine feed port, a brine discharge port, a steam inlet and a secondary steam outlet. The brine feed port is used for feeding brine. In practice, the brine feed port is connected to the electrolytic water system, and the brine generated by the electrolytic system is concentrated and reused; the brine discharge port is connected to the primary brine section, and is used to reuse the concentrated brine to the primary brine section, thereby reducing the demand for raw salt in the salt-making process; the steam inlet is connected to the existing low-pressure steam system in the plant area, and the heat of the steam condensate of the low-pressure steam system is used to concentrate the brine; the secondary steam outlet is connected to the vacuum system, which is a conventional technology in this field and will not be described in detail in this utility model. The vacuum system evacuates the non-condensable gas in the secondary steam, and the condensate generated after the steam in the secondary steam is cooled is transported to the boundary area for discharge.
[0029] The above-mentioned multi-effect evaporation and concentration unit includes a multi-effect evaporator composed of multiple single-effect evaporators, a steam condensate collection tank 5 and a brine storage tank 7. According to the temperature of the steam and the cooling and concentration requirements in actual production, the multi-effect evaporator can preferably be a triple-effect evaporator composed of three single-effect evaporators, or a five-effect evaporator composed of five single-effect evaporators. In this embodiment, a triple-effect evaporator is preferably used. The triple-effect evaporator specifically includes an I-effect evaporator 1, a II-effect evaporator 2 and a III-effect evaporator 3. The I-effect evaporator 1, the II-effect evaporator 2 and the III-effect evaporator 3 are all provided with a brine feed port, a brine discharge port, a steam inlet and a secondary steam outlet. The brine feed inlet of the first-effect evaporator 1, the brine discharge outlet of the second-effect evaporator 2, the brine feed inlet of the second-effect evaporator 2 and the brine discharge outlet of the third-effect evaporator 3 are sequentially connected in series, that is, the brine flow paths of the first-effect evaporator 1, the second-effect evaporator 2 and the third-effect evaporator 3 are sequentially connected in series through the feed pipe; the secondary steam outlet of the first-effect evaporator 1, the steam inlet of the second-effect evaporator 2, the secondary steam outlet of the second-effect evaporator 2 and the steam inlet of the third-effect evaporator 3 are sequentially connected in series, that is, the steam flow paths of the first-effect evaporator 1, the second-effect evaporator 2 and the third-effect evaporator 3 are sequentially connected in series through the steam pipe.
[0030] Specifically, the first-effect evaporator 1 is a rising film evaporator with a separate structure of an evaporation chamber 11 and a preheater 12. The first-effect evaporator 1 includes a split evaporation chamber 11 and a preheater 12, wherein the steam inlet of the preheater 12 is connected to the low-pressure steam system, the condensate outlet of the preheater 12 is connected to the water inlet of the steam condensate collecting tank 5, the steam outlet of the preheater 12 is connected to the steam inlet of the evaporation chamber 11, the secondary steam outlet of the evaporation chamber 11 is connected to the steam inlet of the second-effect evaporator 2, and the brine discharge port of the evaporation chamber 11 is connected to the primary brine section or the light brine storage tank 7 through a concentrated brine pipeline.
[0031] The salt water storage tank 7 is primarily used to temporarily store salt water from the electrolytic water system before supplying it to the multi-effect evaporation and concentration unit for concentration. During system startup and shutdown, if the brine flowing out of the evaporation chamber 11 is of substandard concentration, the brine outlet of the evaporation chamber 11 is connected to the salt water storage tank 7, which collects the substandard brine. During normal system operation, the brine outlet of the evaporation chamber 11 is connected to the primary brine process, recycling the qualified brine back to the primary brine process.
[0032] To prevent salt crystallization from the concentrated brine and blockage within the first-effect evaporator 1, the first-effect evaporator 1 of the present invention is preferably a forced circulation evaporator. A forced circulation loop is provided within the forced circulation evaporator. The forced circulation loop is configured as a pipeline connecting the brine discharge port of the evaporation chamber 11 and the brine feed port of the preheater 12. A forced circulation pump 13 is provided within the forced circulation loop. Forced circulation pump 13 increases the transport rate of the concentrated brine within the first-effect evaporator 1, thereby increasing the solubility of the salt, preventing salt crystallization from the concentrated brine, and preventing blockage within the first-effect evaporator 1.
[0033] The above-mentioned II-effect evaporator 2 is an integrated falling film evaporator. The steam inlet of the II-effect evaporator 2 is connected to the secondary steam outlet of the evaporation chamber 11 of the I-effect evaporator 1, the brine feed port of the II-effect evaporator 2 is connected to the brine discharge port of the III-effect evaporator 3, and the brine discharge port of the II-effect evaporator 2 is connected to the brine feed port of the I-effect evaporator 1.
[0034] The structure of the III-effect evaporator 3 is the same as that of the II-effect evaporator 2. The brine feed port of the III-effect evaporator 3 is connected to the brine storage tank 7. The steam inlet of the III-effect evaporator 3 is connected to the secondary steam outlet of the II-effect evaporator 2. The brine discharge port of the III-effect evaporator 3 is connected to the brine feed port of the II-effect evaporator 2. The secondary steam outlet of the III-effect evaporator 3 is connected to the vacuum system.
[0035] In order to improve the concentration efficiency of the system, the above-mentioned multi-effect evaporation concentration unit further includes a heat exchanger 6, which includes a first heat exchanger 61, a second heat exchanger 62, a third heat exchanger 63 and a fourth heat exchanger 64. The steam condensate in the steam condensate collecting tank 5 is transported to the boundary area for discharge through the first heat exchanger 61 and the second heat exchanger 62. The first heat exchanger 61 is arranged on the pipeline connecting the brine discharge port of the III-effect evaporator 3 and the brine feed port of the II-effect evaporator 2, and is used for heat exchange between the primary concentrated brine flowing out of the III-effect evaporator 3 and the steam condensate. The second heat exchanger 62 is arranged on the pipeline connecting the brine discharge port of the II-effect evaporator 2 and the I-effect evaporator. 1, is used for heat exchange between the secondary concentrated brine flowing out of the II-effect evaporator 2 and the steam condensate; the third heat exchanger 63 and the fourth heat exchanger 64 are sequentially arranged on the connecting pipeline between the brine discharge port of the I-effect evaporator 1 and the primary brine section, and the concentrated brine is recycled to the primary brine section through the third heat exchanger 63 and the fourth heat exchanger 64. The third heat exchanger 63 is used for heat exchange between the secondary concentrated brine flowing out of the II-effect evaporator 2 and the tertiary concentrated brine flowing out of the I-effect evaporator 1, and the fourth heat exchanger 64 is used for heat exchange between the primary concentrated brine flowing out of the III-effect evaporator 3 and the tertiary concentrated brine flowing out of the I-effect evaporator 1.
[0036] The flow path of steam in the multi-effect evaporation concentration unit is as follows: steam from the low-pressure steam system enters the preheater 12 of the first-effect evaporator 1, and the preheater 12 uses steam to preheat the brine. The generated steam condensate is collected in the steam condensate collection tank 5. The steam condensate then passes through the second heat exchanger 62 and the first heat exchanger 61 in sequence. The steam condensate serves as a heat source to heat the primary concentrated brine and the secondary concentrated brine, making full use of the thermal energy of the steam condensate. The steam condensate is finally transported to the boundary area for discharge; the flash steam flashed out of the first-effect evaporator 1 passes through the second-effect evaporator 2 and the third-effect evaporator 3 in sequence. The flash steam serves as a heating source to heat and concentrate the brine in the second-effect evaporator 2 and the third-effect evaporator 3. The flash steam flashed out from the third-effect evaporator 3 passes through the vacuum system as secondary steam. The vacuum system exhausts the non-condensable gas in the secondary steam, and the condensate in the secondary steam after steam cooling is transported to the boundary area for discharge.
[0037] The flow path of the brine in the multi-effect evaporation concentration unit is as follows: the brine solution from the electrolysis system enters the brine storage tank 7, and then the brine enters the III-effect evaporator 3 for concentration. The concentrated primary brine enters the first heat exchanger 61 for heat exchange with the steam condensate; the primary concentrated brine after heat exchange with the steam condensate is transported to the II-effect evaporator 2 for concentration, and the secondary concentrated brine after concentration in the II-effect evaporator 2 enters the second heat exchanger 62 for heat exchange with the steam condensate. The secondary concentrated brine after heat exchange is transported to the I-effect evaporator 1 for concentration. The tertiary concentrated brine after concentration in the I-effect evaporator 1 passes through the third heat exchanger 63 and the fourth heat exchanger 64 in sequence, and is then reused in the primary brine section, thereby reducing the use of raw salt in the salt-making process and lowering production costs.
[0038] In actual production, when the tertiary concentrated brine finally passes through the fourth heat exchanger 64, salt crystals may precipitate due to the brine's excessive concentration, causing blockage of the fourth heat exchanger 64. To address this blockage issue in the fourth heat exchanger 64, the present invention adds a condensate reflux flushing unit. This unit collects the condensate originally transported to the boundary discharge area and returns the condensate to the multi-effect evaporation and concentration unit. When the fourth heat exchanger 64 becomes clogged, the condensate is used to flush the multi-effect evaporation and concentration unit, remelting the precipitated salt crystals and resolving the blockage issue in the fourth heat exchanger 64.
[0039] Specifically, the condensate reflux flushing unit includes a condensate reflux collection tank 4 and a condensate reflux pipeline. The condensate reflux collection tank 4 is provided with a first branch pipe and a second branch pipe, which are arranged in parallel. The water inlet of the condensate reflux collection tank 4 is connected to the water outlet of the steam condensate collection tank 5 via the first branch pipe, collecting low-pressure steam condensate from the multi-effect evaporation and concentration unit. Simultaneously, the water inlet of the condensate reflux collection tank 4 is connected to the steam condensate outlet of the vacuum system via a second branch pipe, collecting steam condensate from the secondary steam generated by the multi-effect evaporation and concentration unit. A condensate reflux port is provided in the evaporation chamber 11 of the first-effect evaporator 1, connecting the condensate reflux port to the water outlet of the condensate reflux collection tank 4 via the condensate reflux pipeline. A condensate washing pump and a reflux valve are provided on the condensate reflux pipeline.
[0040] When the flow rate of concentrated brine in the concentrated brine pipeline between the fourth heat exchanger 64 and the primary brine section is observed to decrease, it indicates that the brine outlet of the fourth heat exchanger 64 is blocked. The three-stage concentrated brine is switched to be connected to the light brine storage tank 7 to collect the condensate with unqualified concentration during the washing effect. After that, the reflux valve is opened, the condensate washing effect pump is started, and the collected condensate is returned to the first-effect evaporator 1. The condensate is used to flush the entire multi-effect evaporation and concentration unit, achieving the purpose of flushing the fourth heat exchanger 64, so that the salt in the fourth heat exchanger 64 is redissolved, and the problem of blockage of the fourth heat exchanger 64 is solved. Furthermore, the reflux valve is preferably an electromagnetic flow valve, which is connected to the existing DCS system of the light brine concentration and reuse system to facilitate the control of the opening and closing and opening degree of the reflux valve.
[0041] Furthermore, in order to facilitate the judgment of whether the fourth heat exchanger 64 is blocked, a flow meter is installed on the brine pipeline between the fourth heat exchanger 64 and the primary brine section. The flow meter serves as a flow monitoring device to monitor the flow rate of the brine outflow. The flow meter is connected to the existing DCS system of the system to facilitate the operator to control the opening and closing and opening degree of the reflux valve according to the flow rate of the brine.
[0042] The anti-clogging working principle of the salt water concentration and reuse system in this embodiment is as follows:
[0043] The brine flow rate is monitored using a flow meter. A significant decrease in the brine flow rate indicates that the flow channels within the fourth heat exchanger 64 are narrowing, indicating a blockage. A "washing" operation is required to flush the multi-effect evaporation and concentration unit. This involves introducing condensate from the condensate reflux collection tank 4 to redissolve any crystallized salt within the fourth heat exchanger 64.
[0044] The "washing effect" operation is divided into "hot" washing effect (the system does not stop) and "cold" washing effect (the system stops).
[0045] When the crystallization situation is not serious, use "hot" washing effect. After the washing effect is completed, the multi-effect evaporation concentration unit can quickly enter the normal operation state. The specific steps are as follows:
[0046] 1. Close the air inlet valve of the multi-effect evaporation concentration unit, stop supplying steam to the I-effect evaporator 1, stop feeding to the III-effect evaporator 3 and the II-effect evaporator 2, and both the III-effect evaporator 3 and the II-effect evaporator 2 enter the "full reflux" mode.
[0047] 2. Stop discharging from the first-effect evaporator 1, switch the tertiary concentrated brine from the first brine section to the light brine storage tank 7, open the reflux valve, start the condensate washing pump, and replenish water to the first-effect evaporator 1. When the liquid level in the evaporation chamber 12 of the first-effect evaporator 1 reaches 80%, use the condensate to flush the first-effect evaporator 1 and maintain the hot cycle for 15 to 30 minutes.
[0048] 3. After flushing is completed, gradually increase the steam flow rate and start feeding into the III-effect evaporator 3. When the brine concentration is qualified, switch the brine pipeline to the primary brine section and re-enter normal operation.
[0049] When crystallization is serious or the "hot" washing effect is not good, the I-effect evaporator 1 needs to be washed in a "cold" state. The specific operation is as follows:
[0050] 1. The multi-effect evaporation concentration unit needs to be stopped, the steam supply to the I-effect evaporator 1 is stopped, and the feeding to the III-effect evaporator 3 and the II-effect evaporator 2 is stopped. The III-effect evaporator 3 and the II-effect evaporator 2 both enter the "full reflux" mode.
[0051] 2. Drain the concentrated brine in the first-effect evaporator 1, switch the tertiary concentrated brine from the first brine section to the light brine storage tank 7, open the reflux valve, start the condensate washing pump, replenish water to the first-effect evaporator 1, and use the condensate to flush the first-effect evaporator 1, maintaining the cold cycle for 15 to 30 minutes.
[0052] 3. After the washing effect is completed, the multi-effect evaporation concentration unit is restarted to supply steam to the I-effect evaporator 1, gradually increase the steam flow rate, and feed from the III-effect evaporator 3 to the II-effect evaporator 2 and the I-effect evaporator 1. When the brine concentration is qualified, the brine pipeline is switched to the primary brine section.
Claims
1. A blockage-resistant salt water concentration and reuse system, characterized by: It includes a multi-effect evaporation concentration unit and a condensate reflux flushing unit; The multi-effect evaporation concentration unit is provided with a brine feed port, a brine discharge port, a steam inlet and a secondary steam outlet, wherein the brine feed port is connected to the electrolysis system, the brine discharge port is connected to the primary brine section, the steam inlet is connected to the steam system, and the secondary steam outlet is connected to the vacuum system; The multi-effect evaporation concentration unit is also provided with a steam condensate outlet and a condensate reflux port; The condensate reflux flushing unit comprises a condensate reflux collecting tank (4) and a condensate reflux pipeline, wherein the water inlet of the condensate reflux collecting tank (4) is connected to the steam condensate outlet of the multi-effect evaporation concentration unit; and the water outlet of the condensate reflux collecting tank is connected to the condensate reflux outlet of the multi-effect evaporation concentration unit via the condensate reflux pipeline.
2. The anti-clogging light salt water concentration and reuse system according to claim 1, characterized in that: The water inlet of the condensate reflux collection tank (4) is provided with a first branch pipe and a second branch pipe in parallel, the water inlet of the condensate reflux collection tank (4) is connected to the steam condensate outlet through the first branch pipe, and the water inlet of the condensate reflux collection tank (4) is connected to the vacuum system through the second branch pipe.
3. The anti-clogging light salt water concentration and reuse system according to claim 2, characterized in that: A reflux valve is provided on the condensate reflux pipeline.
4. The anti-clogging light salt water concentration and reuse system according to claim 3 is characterized in that: The condensate reflux pipeline is further provided with a condensate washing pump, and the condensate washing pump and the reflux valve are arranged in sequence.
5. The anti-clogging light salt water concentration and reuse system according to claim 4 is characterized in that: It also includes a flow monitoring device, which is arranged on a pipeline connecting the multi-effect evaporation concentration unit and the primary brine section.
6. The anti-clogging light salt water concentration and reuse system according to any one of claims 1 to 5, characterized in that: The multi-effect evaporation concentration unit is a triple-effect evaporator, which comprises a first-effect evaporator (1), a second-effect evaporator (2) and a third-effect evaporator (3), wherein the first-effect evaporator (1), the second-effect evaporator (2) and the third-effect evaporator (3) are all provided with a brine feed port, a brine discharge port, a steam inlet and a secondary steam outlet; The brine feed port of the first-effect evaporator (1), the brine discharge port of the second-effect evaporator (2), the brine feed port of the second-effect evaporator (2) and the brine discharge port of the third-effect evaporator (3) are sequentially connected in series; the brine feed port of the third-effect evaporator (3) is connected to the electrolytic water system, and the brine discharge port of the first-effect evaporator (1) is connected to the primary brine section; The secondary steam outlet of the first-effect evaporator (1), the steam inlet of the second-effect evaporator (2), the secondary steam outlet of the second-effect evaporator (2) and the steam inlet of the third-effect evaporator (3) are sequentially connected in series; the steam inlet of the first-effect evaporator (1) is connected to the steam system, and the secondary steam outlet of the third-effect evaporator (3) is connected to the vacuum system; The first-effect evaporator (1) is provided with a steam condensate outlet and a condensate reflux port; the steam condensate outlet is connected to the water inlet of the condensate reflux collection tank (4), and the condensate reflux port is connected to the water outlet of the condensate reflux collection tank (4) through a condensate reflux pipeline.
7. The anti-clogging light salt water concentration and reuse system according to claim 6, characterized in that: The first-effect evaporator (1) is a rising film evaporator.
8. The anti-clogging light salt water concentration and reuse system according to claim 7, characterized in that: The rising film evaporator is a forced circulation evaporator.
9. The anti-clogging salt water concentration and reuse system according to claim 8, characterized in that: The II-effect evaporator (2) and the III-effect evaporator (3) are both falling film evaporators.