Sodium chloride falling film demister

Abstract

The invention discloses a sodium chloride falling film demister which comprises a demister body, the baffle plates are obliquely arranged on two sides of the inner wall of the demister body in a staggered manner and are used for blocking and separating liquid drops in the steam; a baffle plate pressure difference sensor is arranged on each baffle plate and is used for detecting the pressure difference before and after the baffle plate blocks and separates the liquid drops; the silk screen plate with a multi-layer structure is arranged above the baffle plate and is used for capturing liquid foam in the steam; a silk screen plate differential pressure sensor is arranged on the silk screen plate to detect the differential pressure before and after the silk screen plate captures liquid foam; the automatic cleaning system is arranged in the demister body, is close to the silk screen plate and the baffle plate, and is used for washing the silk screen plate and the baffle plate; and the central control system is in communication connection with the baffle plate pressure difference sensor, the silk screen plate pressure difference sensor and the automatic cleaning system and controls cleaning of the silk screen plate and the baffle plate according to a pressure difference result. The problems that a traditional sodium chloride evaporation device is low in separation efficiency, prone to blockage, not easy to maintain and the like can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical equipment, and in particular to a sodium chloride falling film deentrainer. Background Art

[0002] The sodium chloride falling film deentrainer is a link in the sodium chloride evaporation and crystallization process. It is connected after the sodium chloride falling film evaporator and is used to block and separate the liquid droplets and liquid foams formed by incomplete vaporization of some liquids during the evaporation process. The main function of the sodium chloride falling film deentrainer is to separate these liquid droplets and foams from the steam to prevent them from entering the condenser or subsequent processing equipment, thereby ensuring the normal operation of the system and the quality of the product.

[0003] In traditional sodium chloride evaporation devices, most deentrainers adopt a single baffle or wire mesh structure, which has the following defects: 1. Low separation efficiency: The single structure has insufficient capture ability for micron-sized liquid droplets, resulting in serious gas-liquid entrainment; 2. Easy to block: The wire mesh structure is prone to fouling due to liquid droplet adhesion and requires frequent shutdown for cleaning; 3. Maintenance lag: Lack of real-time monitoring means, unable to predict performance decay, and thus unable to solve the problem of short service life of the wire mesh structure caused by air flow impact.

[0004] Therefore, it is necessary to provide a sodium chloride falling film deentrainer that can overcome the problems of low separation efficiency, easy blockage, and difficult maintenance existing in traditional sodium chloride falling film deentrainers.

[0005] The statements here only provide background art related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a sodium chloride falling film deentrainer, which can solve the problems of low separation efficiency, easy blockage, and difficult maintenance existing in traditional sodium chloride evaporation devices.

[0007] To achieve the above object, the present invention provides a sodium chloride falling film deentrainer, including: A deentrainer body, whose lower end is connected to a sodium chloride falling film evaporator, and whose upper end is connected to a condenser and subsequent processing equipment; Multiple baffle plates, which are staggered and inclined on both sides of the inner wall of the deentrainer body and are used to block and separate the liquid droplets existing in the upward steam generated from the sodium chloride falling film evaporator; A baffle plate differential pressure sensor is arranged on each baffle plate to detect the differential pressure before and after the baffle plate blocks and separates the liquid droplets; A wire mesh plate with a multi-layer structure, which is arranged above the baffle plate and is used to capture the remaining liquid foams in the upward steam; A wire mesh plate differential pressure sensor is arranged on the wire mesh plate to detect the differential pressure before and after the wire mesh plate captures the liquid foams; An automatic cleaning system, which is arranged in the deentrainer body and close to the wire mesh plate and the baffle plate, and is used to wash the wire mesh plate and the baffle plate; The central control system is communicatively connected to the baffle differential pressure sensor, the wire mesh plate differential pressure sensor and the automatic cleaning system, and based on the real-time monitored differential pressure, feeds back the separation state of the wire mesh plate and the baffle, and controls the automatic cleaning system to start the automatic cleaning of the wire mesh plate and / or the baffle; Wherein, each baffle on each side is arranged to incline downward, and forms an angle of 30° to 45° with the inner wall of the demister body.

[0008] Optionally, the sodium chloride falling film demister further comprises: A buffer part, which is a buffer space arranged between the baffle and the wire mesh plate to reduce the impact of the upward flowing steam on the wire mesh plate; A heating component, which is arranged on the inner wall of the demister body and at the end far from the wire mesh plate, and is used to provide a thermal environment for the steam flowing in the demister body.

[0009] Optionally, the height of the buffer part is 1 / 5 to 1 / 4 of the diameter of the demister body.

[0010] Optionally, the baffle is corrugated, and the protruding structures and the recessed structures on its surface are arranged at intervals to improve the blocking and separation efficiency of the droplets in the steam.

[0011] Optionally, the surface of the wire mesh plate is coated with a PTFE coating; the porosity of the wire mesh plate is ≥97%.

[0012] Optionally, the automatic cleaning system comprises: A first automatic cleaning device, which is arranged on the inner wall of the demister body and below the baffle, and sprays and washes the baffle; A second automatic cleaning device, which is arranged on the inner wall of the demister body and below the wire mesh plate, and sprays and washes the wire mesh plate.

[0013] Optionally, the central control system feeds back the separation state of the baffle according to the monitored differential pressure as follows: When the central control system detects that the differential pressure captured by the baffle differential pressure sensor exceeds the baffle differential pressure threshold, it sends a signal to be cleaned to the first automatic cleaning device to start the spray cleaning of the baffle.

[0014] Optionally, the central control system feeds back the separation state of the wire mesh plate according to the monitored differential pressure as follows: When the central control system detects that the differential pressure captured by the wire mesh plate differential pressure sensor exceeds the wire mesh plate differential pressure threshold, it sends a signal to be cleaned to the second automatic cleaning device to start the spray cleaning of the wire mesh plate.

[0015] Optionally, the baffle pressure difference threshold is set to ΔP1≤0.5-1 kPa; the wire mesh plate pressure difference threshold is set to ΔP2≤1.5-3 kPa.

[0016] In summary, compared with the prior art, the present invention has the following beneficial effects: 1. The sodium chloride falling film demister provided by the present invention adopts baffles and wire mesh plates for multi-stage separation, which has better separation effect on large droplets and liquid foam in steam and higher separation efficiency.

[0017] 2. The sodium chloride falling film demister provided by the present invention is equipped with an intelligent monitoring and cleaning system, which makes it less prone to clogging, easier to maintain, reduces the frequency of manual inspections, and improves production safety.

[0018] 3. The sodium chloride falling film demister provided by the present invention is suitable for high-salt and high-humidity working conditions, the continuous operation cycle of the equipment is extended, and the maintenance cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a sodium chloride falling film demister of the present invention; Figure 2 It is a schematic diagram of the baffle structure of the present invention; Figure 3 It is a schematic diagram of the wire mesh plate structure of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the attached Figures 1 - 3 , the present invention is further described in detail through preferred embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purposes, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0021] The sodium chloride falling film demister with intelligent monitoring function is used to separate liquid droplets and foams in the steam after sodium chloride falling film evaporation, so as to prevent the liquid droplets and liquid foams from entering the condenser and other post-processing equipment to affect the system operation and product quality.

[0022] The present invention provides a sodium chloride falling film demister, as Figure 1 shown. The sodium chloride falling film demister includes: a demister body, the lower end of which is connected to a sodium chloride falling film evaporator 100, and the upper end of which is connected to a condenser 300 and subsequent processing equipment; a plurality of baffle plates 200, which are arranged in a staggered and inclined manner on both sides of the inner wall of the demister body and are used to block and separate large droplets existing in the upward steam generated from the sodium chloride falling film evaporator 100; a wire mesh plate 400, which is arranged above the baffle plates 200 and is used to capture the remaining liquid foam in the upward steam; a plurality of baffle plate differential pressure sensors 201, which are respectively arranged on each baffle plate 200 and are used to detect the differential pressure before and after the baffle plate 200 blocks and separates large droplets; a wire mesh plate differential pressure sensor 401, which is arranged on the wire mesh plate 400 and is used to detect the differential pressure before and after the wire mesh plate 400 captures liquid foam; an automatic cleaning system, which is arranged in the demister body and is close to the positions of the wire mesh plate 400 and the baffle plates 200 and is used to wash the wire mesh plate 400 and the baffle plates 200; a heating component 500, which is arranged on the inner wall of the demister body and at one end far from the wire mesh plate 400 and is used to provide a thermal environment for the steam flowing in the demister body to maintain the vaporization temperature and prevent condensation; a central control system, which is communicatively connected to the baffle plate differential pressure sensors 201, the wire mesh plate differential pressure sensor 401 and the automatic cleaning system, so as to feedback the separation state according to the real-time monitored differential pressure and select to start the automatic cleaning of the wire mesh plate 400 and / or the baffle plates 200.

[0023] Among them, as Figure 2 shown, the baffle plate 200 is corrugated, and the convex structures and concave structures on its surface are arranged at intervals. The surface structure of the baffle plate 200 causes the steam in the sodium chloride falling film demister to change its airflow path when flowing upward through the baffle plate 200, and the turbulence is more obvious, effectively accelerating the time for liquid droplets to collide and agglomerate on the baffle plate 200, thereby improving the blocking and separation efficiency of liquid droplets in the steam.

[0024] Preferably, a plurality of the baffle plates 200 are all made of 316L stainless steel, are arranged obliquely downward, and form an angle of 30° - 45° with the inner wall of the demister body.

[0025] Furthermore, the baffle plate 200 includes a plurality of first baffle plates 210, which are arranged on one side of the inner wall of the demister body, are arranged at intervals in the extending direction of the inner wall up and down, and each first baffle plate 210 is inclined downward relative to its installation point on the inner wall of the demister body; among them, the first baffle plate 210 forms an angle of 30° - 45° with the inner wall of the demister body on its installation side.

[0026] The baffle 200 further includes a plurality of second baffles 220, which are arranged on the other side of the inner wall of the demister body at intervals along the extending direction of the inner wall on this side, and are arranged vertically at a certain distance. Moreover, each second baffle 220 is inclined downward relative to the installation point of the inner wall of the demister body; wherein, the second baffle 220 forms an angle of 30°-45° with the inner wall of the demister body on its installation side.

[0027] In addition, each first baffle 210 and each second baffle 220 are arranged alternately. That is, the installation point of the uppermost first baffle 210 on the inner wall of the demister body is the highest, the installation point of the uppermost second baffle 220 on the inner wall of the demister body is slightly lower, the installation point of the second uppermost first baffle 210 on the inner wall of the demister body is even lower, and the installation point of the second uppermost second baffle 220 on the inner wall of the demister body is the lowest; furthermore, at the ends of the uppermost first baffle 210, the uppermost second baffle 220, the second uppermost first baffle 210, and the second uppermost second baffle 220 away from their respective installation points, a similar spatial position relationship is also formed, that is, the height of the end of the uppermost first baffle 210 away from its installation point > the height of the end of the uppermost second baffle 220 away from its installation point > the height of the end of the second uppermost first baffle 210 away from its installation point > the height of the end of the second uppermost second baffle 220 away from its installation point. And the ends of each first baffle 210 and each second baffle 220 away from the installation point exceed the central axis of the demister body to ensure that the liquid droplets in the steam are completely blocked and separated.

[0028] Among them, as Figure 3 shown, the wire mesh plate 400 has a multi-layer structure and is made of stainless steel. Its surface is coated with a PTFE (polytetrafluoroethylene) coating. Therefore, the surface of the wire mesh plate 400 has strong hydrophobicity, and small liquid droplets are not easily attached, significantly reducing the risk of the wire mesh plate 400 being blocked by small liquid droplets.

[0029] Preferably, the wire mesh plate 400 is provided with 2-3 layers to ensure complete capture of the residual liquid foam in the steam; the outer diameter of the wire forming the wire mesh plate 400 is 0.1-0.4 mm, the porosity is ≥97%, and the thickness of the PTFE (polytetrafluoroethylene) coating is 10-20 μm.

[0030] Among them, the sodium chloride falling film demister further includes: a buffer part 600, which is a buffer space located inside the demister body and arranged between the baffle plate 200 and the wire mesh plate 400, that is, a section of interval is arranged between the baffle plate 200 and the wire mesh plate 400 to form the buffer part 600. The buffer part 600 is used to slow down the speed of the steam flowing upward from the baffle plate 200 through the wire mesh plate 400, so as to reduce the impact of the steam airflow on the wire mesh plate 400, and further extend the service life of the wire mesh plate 400.

[0031] Preferably, the height of the buffer part 600 is 1 / 5 to 1 / 4 of the diameter of the demister body; the airflow speed of the steam is controlled at 3 to 5 m / s.

[0032] Among them, the automatic cleaning system includes: a first automatic cleaning device 701, which is fixedly arranged on the inner wall of the demister body and is located below the baffle plate 200 to spray and wash the baffle plate 200 after a large amount of liquid droplets and particulate matters are gathered on the baffle plate 200; a second automatic cleaning device 702, which is fixedly arranged on the inner wall of the demister body and is located below the wire mesh plate 400 to spray and wash the wire mesh plate 400 after a large amount of liquid foams and particulate matters are suspended on the wire mesh plate 400.

[0033] Specifically, the first automatic cleaning device 701 includes: a spray pipe fixedly connected to the inner wall of the demister body, and a plurality of spray heads installed on the spray pipe; among them, the spray pipe is connected to an external water supply system and can open the spray heads to clean the baffle plate 200 after receiving a cleaning signal from the central control system; the structure and cleaning method of the second automatic cleaning device 702 are the same as those of the first automatic cleaning device 701.

[0034] Furthermore, a plurality of baffle plate differential pressure sensors 201 are arranged at the end of each baffle plate 200; when the steam flows through the baffle plate 200, after particulate matters and large liquid droplets adhere to the surface of the baffle plates 200, the resistance of the sodium chloride crystal salt steam flowing upward gradually increases, resulting in different forces on the side with the convex structure and the side with the concave structure of the baffle plate 200; the baffle plate differential pressure sensor 201 obtains the differential pressure on each baffle plate 200 by detecting the pressures on both sides of each baffle plate 200.

[0035] In a specific embodiment of the present invention, the baffle plate differential pressure sensor 201 is arranged at one end of each baffle plate 200 close to the inner wall of the demister body.

[0036] Further, when the wire mesh plate differential pressure sensor 401 is working, as the sodium chloride crystal salt vapor flows upward, particulate matter, small droplets and liquid foam gradually adhere to the surface of the wire mesh plate 400. After that, the resistances on the upper and lower sides of the wire mesh plate 400, that is, the inflow side and the outflow side of the vapor, are different; the wire mesh plate differential pressure sensor 401 obtains the differential pressure by detecting the resistances on the inflow side surface and the outflow side surface of the wire mesh plate 400.

[0037] In a specific embodiment of the present invention, the baffle plate differential pressure sensor 201 and the wire mesh plate differential pressure sensor 401 adopt differential pressure sensors of high-precision models (range: 0 - 10 kPa). Specifically, the baffle plate differential pressure sensor 201 and the wire mesh plate differential pressure sensor 401 adopted in the present invention are both LianCe SIN-P300G.

[0038] Furthermore, there is a communication connection between the central control system, the baffle plate differential pressure sensor 201, the wire mesh plate differential pressure sensor 401 and the automatic cleaning system.

[0039] Specifically, when the central control system detects that the differential pressure captured by the baffle plate differential pressure sensor 201 exceeds the baffle plate differential pressure threshold, it indicates that too much particulate matter and liquid droplets have accumulated on the surface of the baffle plate 200, and the separation efficiency of the baffle plate 200 is poor. Then an alarm is triggered, and a signal to be cleaned is sent to the first automatic cleaning device 701 to start the spray cleaning of the baffle plate 200; when the central control system detects that the differential pressure captured by the baffle plate differential pressure sensor 201 is within the baffle plate differential pressure threshold range, it indicates that not too much particulate matter and liquid droplets have accumulated on the surface of the baffle plate 200, and the baffle plate 200 can separate the liquid droplets in the vapor well.

[0040] In addition, when too many liquid droplets accumulate on the surface of the baffle plate 200, or when the pressure of the incoming sodium chloride vapor is too high, resulting in too large a differential pressure on the surface of the baffle plate 200 (that is, exceeding the baffle plate differential pressure threshold), it will also cause the inclined baffle plate 200 to be easily detached and damaged; and through the setting of the baffle plate differential pressure sensor 201, when the differential pressure exceeds the baffle plate differential pressure threshold, an alarm will be triggered and the baffle plate 200 will be spray-cleaned, so that the differential pressure on the surface of the baffle plate 200 returns to within the differential pressure threshold range. This also makes the operation time of the sodium chloride falling film de-foamer longer, and the vulnerable baffle plate 200 is maintained in a timely manner during operation.

[0041] When the central control system detects that the pressure difference captured by the wire mesh plate pressure difference sensor 401 exceeds the wire mesh plate pressure difference threshold, it indicates that excessive particulate matter, small droplets, and liquid foams adhere to the surface of the wire mesh plate 400, and the separation efficiency of the wire mesh plate 400 is poor. Then, an alarm is triggered, and a signal to be cleaned is sent to the second automatic cleaning device 702 to start the spray cleaning of the wire mesh plate 400. When the central control system detects that the pressure difference captured by the wire mesh plate pressure difference sensor 401 is within the wire mesh plate pressure difference threshold range, it indicates that excessive particulate matter, small droplets, and liquid foams do not adhere to the surface of the wire mesh plate 400, and the wire mesh plate 400 can separate the liquid foam in the steam well.

[0042] In a specific embodiment of the present invention, the baffle plate pressure difference threshold is set to ΔP1 ≤ 0.5 - 1 kPa; the wire mesh plate pressure difference threshold is set to ΔP2 ≤ 1.5 - 3 kPa.

[0043] In summary, a sodium chloride falling film defoamer provided by the present invention is applicable to scenarios such as MVR (mechanical vapor recompression) sodium chloride evaporators and high-salt wastewater treatment systems, can be compatible with the separation requirements of salts such as sodium sulfate and magnesium chloride, and is suitable for the transformation of existing evaporation and concentration production lines. In addition, the sodium chloride falling film defoamer has the advantages of high separation efficiency, not being easily blocked, and being easy to maintain through multi-stage separation, intelligent monitoring, and cleaning methods.

[0044] It should be noted that in this article, the term "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article, or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article, or device including the said element.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "height", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0046] In the description of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0048] Although the content of the present invention has been introduced in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and substitutions to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A sodium chloride falling film foam eliminator, characterized in that, Comprising: A demister body, the lower end of which is connected to a sodium chloride falling film evaporator (100), and the upper end of which is connected to a condenser (300) and subsequent processing equipment; Multiple baffle plates (200), arranged staggeredly and obliquely on both sides of the inner wall of the demister body, for blocking and separating droplets existing in the upward steam generated from the sodium chloride falling film evaporator (100); A baffle plate differential pressure sensor (201) is arranged on each baffle plate (200) to detect the differential pressure before and after the baffle plate (200) blocks and separates droplets; A wire mesh plate (400) with a multi-layer structure, arranged above the baffle plate (200), for capturing residual liquid foam in the upward steam; A wire mesh plate differential pressure sensor (401) is arranged on the wire mesh plate (400) to detect the differential pressure before and after the wire mesh plate (400) captures liquid foam; An automatic cleaning system, arranged inside the demister body and near the wire mesh plate (400) and the baffle plate (200), for flushing the wire mesh plate (400) and the baffle plate (200); A central control system, communicatively connected to the baffle plate differential pressure sensor (201), the wire mesh plate differential pressure sensor (401) and the automatic cleaning system, feeds back the separation state of the wire mesh plate (400) and the baffle plate (200) according to the real-time monitored differential pressure, and controls the automatic cleaning system to start the automatic cleaning of the wire mesh plate (400) and / or the baffle plate (200); Wherein, each baffle plate (200) on each side is arranged obliquely downward and forms an angle of 30° - 45° with the inner wall of the demister body.

2. The sodium chloride falling film defoamer according to claim 1, wherein The sodium chloride falling film demister further comprises: A buffer part (600), which is a buffer space arranged between the baffle plate (200) and the wire mesh plate (400) to reduce the impact of the upward flowing steam on the wire mesh plate (400); A heating component (500), arranged on the inner wall of the demister body and at one end far from the wire mesh plate (400), for providing a thermal environment for the steam flowing inside the demister body.

3. The sodium chloride falling film defoamer according to claim 2, characterized in that, The height of the buffer part (600) is 1 / 5 - 1 / 4 of the diameter of the demister body.

4. The sodium chloride falling film defoamer according to claim 1, characterized in that, The baffle plate (200) is corrugated, and the protruding structures and recessed structures on its surface are arranged at intervals to improve the blocking and separation efficiency of droplets in the steam.

5. The sodium chloride falling film defoamer according to claim 1, characterized in that, The surface of the wire mesh plate (400) is coated with a PTFE coating; The porosity of the wire mesh plate (400) ≥ 97%.

6. The sodium chloride falling film defoamer according to claim 1, characterized in that The automatic cleaning system comprises: A first automatic cleaning device (701), arranged on the inner wall of the demister body and below the baffle plate (200), for spray-washing the baffle plate (200); A second automatic cleaning device (702), arranged on the inner wall of the demister body and below the wire mesh plate (400), for spray-washing the wire mesh plate (400).

7. The sodium chloride falling film defoamer according to claim 6, wherein, The central control system feeds back the separation state of the baffle plate (200) according to the monitored differential pressure as follows: When the central control system detects that the pressure difference captured by the baffle pressure difference sensor (201) exceeds the baffle pressure difference threshold, it sends a signal to be cleaned to the first automatic cleaning device (701) to initiate the spray cleaning of the baffle (200).

8. The sodium chloride falling film de-foamer according to claim 6, wherein The central control system feeds back the separation state of the wire mesh plate (400) according to the monitored pressure difference as follows: When the central control system detects that the pressure difference captured by the wire mesh plate pressure difference sensor (401) exceeds the wire mesh plate pressure difference threshold, it sends a signal to be cleaned to the second automatic cleaning device (702) to initiate the spray cleaning of the wire mesh plate (400).

9. The sodium chloride falling film defoamer according to claim 7 or 8, characterized in that, The baffle pressure difference threshold is set to ΔP1 ≤ 0.5 - 1 kPa; the wire mesh plate pressure difference threshold is set to ΔP2 ≤ 1.5 - 3 kPa.

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