Vacuum film evaporation and concentration treatment device for liquid hazardous wastes

Abstract

The utility model discloses a vacuum film evaporation and concentration treatment device for liquid hazardous wastes, which comprises an evaporation tank comprising a tank body, the tank body is coated with a heating jacket, the top of the tank body is provided with a feed port, a vacuumizing port, a cleaning port and a steam outlet, and the bottom of the tank body is provided with a discharge port; the film distributing device comprises a film distributing unit and a driving mechanism which are arranged in the tank body, and when the film distributing unit rotates, materials entering from the feeding opening can be thrown to the inner wall of the tank body; the vacuum device is used for vacuumizing the interior of the tank body; the condensing device is used for condensing the steam discharged from the steam outlet; the cleaning device comprises a cleaning tank, a cleaning pump and a cleaning pipeline arranged in the tank body, and a spray head is arranged on the cleaning pipeline. The vacuum film evaporation technology is adopted for treating the liquid hazardous waste, the vacuum evaporation technology and the film evaporation technology are organically combined, the device is suitable for treating heat-sensitive liquid materials, the evaporation efficiency is improved, and safe and efficient treatment of the liquid hazardous waste materials is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of hazardous waste treatment technology, specifically relating to a vacuum thin-film evaporation and concentration treatment device for liquid hazardous waste. Background Technology

[0002] Industrial production generates large quantities of liquid hazardous waste, such as chemical waste liquids, electroplating wastewater, and waste acids and alkalis. These contain numerous harmful substances, including heavy metals, organic pollutants, and toxic and hazardous materials. If discharged directly without proper treatment, they will cause serious pollution to the soil, water bodies, and atmosphere, endangering ecological balance and human health. Therefore, the safe and effective treatment and disposal of liquid hazardous waste is of paramount importance.

[0003] In the treatment of liquid hazardous waste, traditional evaporation and concentration can reduce the volume of waste, facilitating subsequent treatment and disposal. However, atmospheric pressure evaporation requires relatively high temperatures, which may cause chemical reactions such as decomposition and polymerization of some heat-sensitive liquid hazardous wastes, producing new harmful substances or reducing the treatability of the waste. Although multi-effect evaporation improves energy utilization to some extent, the equipment structure is complex, the investment cost is high, and the treatment efficiency still needs to be improved. Utility Model Content

[0004] The purpose of this invention is to provide a vacuum thin-film evaporation and concentration treatment device for liquid hazardous waste, so as to solve the problems of treatment efficiency and safety when treating liquid hazardous waste.

[0005] This utility model is achieved through the following technical solution:

[0006] A vacuum thin-film evaporation and concentration treatment device for liquid hazardous waste includes:

[0007] An evaporator includes a tank body, which is covered by a heating jacket. The top of the tank body is provided with a feed inlet, a vacuum port, a cleaning port and a steam outlet, and the bottom of the tank body is provided with a discharge port.

[0008] A film-spreading device includes a film-spreading unit and a drive mechanism disposed inside a tank. The drive mechanism is used to drive the film-spreading unit to rotate. When the film-spreading unit rotates, it can throw the material entering from the feed inlet onto the inner wall of the tank.

[0009] A vacuum device, connected to a vacuum port, is used to create a vacuum inside the tank.

[0010] A condensing device, connected to a steam outlet, is used to condense the steam discharged from the steam outlet;

[0011] The cleaning device comprises a cleaning tank, a cleaning pump and a cleaning pipeline arranged in the tank body, the cleaning pump is used for pumping cleaning liquid in the cleaning tank to the cleaning pipeline, and a spray head is arranged on the cleaning pipeline.

[0012] In some embodiments, a heating coil is arranged around the heating disc outside the tank body.

[0013] In some embodiments, the film distribution unit comprises a rotating shaft and a plurality of blades arranged on the rotating shaft, the blades are arranged in a spiral on the rotating shaft, the blade surface of the blades is trapezoidal, and the upper base of the trapezoid is connected with the rotating shaft.

[0014] In some embodiments, the spiral angle of the blades is 30-60°.

[0015] In some embodiments, a plurality of protrusions are arranged on the blade surface of the blades.

[0016] In some embodiments, the feeding port is arranged on the tank body close to the position above the film distribution unit, so that the material entering from the feeding port can be sent to the film distribution unit.

[0017] In some embodiments, the condensing device comprises a tube shell, a condensing pipeline and a plurality of baffles.

[0018] The condensing pipeline is arranged in the tube shell and communicates with the steam outlet, the plurality of baffles are arranged axially along the tube shell, the baffles are sealingly connected with the tube shell and are provided with gaps for the flow of cooling medium between the tube shell, and adjacent gaps are arranged in an up-and-down staggered manner to form an S-shaped flow channel inside the tube shell.

[0019] In some embodiments, the baffles are in an arc structure.

[0020] In some embodiments, a plurality of through holes are arranged on the baffles.

[0021] In some embodiments, the height of the gap between the baffles and the tube shell is 20-40% of the inner diameter of the tube shell.

[0022] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0023] The utility model adopts vacuum thin film evaporation technology to treat liquid hazardous waste, organically combines vacuum evaporation and thin film evaporation technology, reduces the boiling point of liquid by using a vacuum environment, realizes low-temperature evaporation, is suitable for the treatment of heat-sensitive liquid materials, and simultaneously forms a thin film of liquid on the inner wall of the evaporation tank by arranging the film distribution unit, increases the evaporation treatment area, improves the evaporation efficiency, realizes safe and efficient treatment of liquid hazardous waste materials.

[0024] The cleaning, condensing device is integrated in the device, the condensation and recovery of steam are realized, the resource utilization rate is improved, the pollution of steam emission to the environment is reduced, and the condensation efficiency and recovery rate are improved through the optimized setting of the condensing device; the evaporation tank and the membrane distribution unit are regularly cleaned through the cleaning device, internal scaling is prevented, and long-term stable operation of the device is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows. Obviously, the following drawings only show some embodiments of the present application, and should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0026] Figure 1 The figure is a structural schematic diagram of the vacuum thin film evaporation and concentration treatment device in the embodiments of the present application.

[0027] Figure 2 The figure is a structural schematic diagram of the membrane distribution unit in the concentration treatment device in the embodiments of the present application.

[0028] Figure 3 The figure is a structural schematic diagram of the condensing device in the concentration treatment device in the embodiments of the present application.

[0029] Among them:

[0030] 10, evaporation tank, 11, tank body, 12, heating jacket, 13, heating coil, 14, feed inlet, 15, vacuum port, 16, cleaning port, 17, steam outlet, 18, discharge port, 19, discharge valve;

[0031] 21, membrane distribution unit, 211, rotating shaft, 212, blade, 213, protrusion, 22, motor;

[0032] 31, vacuum pump, 32, vacuum pipeline, 33, vacuum valve;

[0033] 40, condensing device, 41, tube shell, 42, condensing pipeline, 43, filter, 44, baffle, 45, notch;

[0034] 51, cleaning tank, 52, cleaning pump, 53, cleaning pipeline, 54, spray head. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments.

[0036] In order to overcome the problems existing in the treatment of hazardous waste by the traditional evaporation concentration method, improve the treatment efficiency and quality of liquid hazardous waste, the utility model provides a kind of high efficiency, energy saving, strong adaptability's vacuum thin film evaporation concentration treatment device.

[0037] Vacuum evaporation technology utilizes the characteristics that the boiling point of liquid is reduced under vacuum environment, can realize the evaporation of liquid at lower temperature, is suitable for processing heat-sensitive substances, and gradually gets wide application;And thin film evaporation technology can significantly improve the evaporation rate by forming liquid into thin film shape and increasing the evaporation area of liquid. The vacuum thin film evaporation concentration treatment device combining vacuum evaporation and thin film evaporation technology can well meet the demand of efficient and safe treatment of hazardous waste in the field of liquid hazardous waste treatment.

[0038] The vacuum thin film evaporation concentration treatment device of the utility model can effectively prevent scaling and blockage, and has good corrosion resistance and stable operation ability.

[0039] Referring to Figure 1 In some embodiments of the utility model, the liquid hazardous waste vacuum thin film evaporation concentration treatment device comprises:

[0040] Evaporation tank 10;Evaporation tank 10 includes tank body 11, heating jacket 12 is arranged outside tank body 11, heating medium is introduced into heating jacket 12 to heat the tank body;Tank body 11 top sets up the feed inlet 18 for feeding, the vacuumizing port 15 for vacuumizing the inside of tank body, the cleaning port 16 for cleaning the inside of tank body and the steam outlet 17 for discharging the evaporated steam;Tank body 11 bottom sets up the discharge port 18 for discharging the concentrated material;

[0041] Membrane distribution device;Membrane distribution device includes membrane distribution unit 21 arranged in tank body and driving mechanism, driving mechanism is used to drive the rotation of membrane distribution unit 21, and the material entering from feed inlet can be uniformly scattered on the inner wall of tank body when membrane distribution unit 21 rotates, to form a thin film on the inner wall;

[0042] Vacuum device;Connected with tank body through vacuumizing port, for vacuumizing the inside of tank body;

[0043] Condensing device 40;Connected with steam outlet 17, for condensing treatment to the steam discharged from steam outlet;

[0044] Cleaning device;Including cleaning tank 51, cleaning pump 52 and cleaning pipeline 53 arranged in tank body 11, cleaning pump 52 is used to pump the cleaning liquid in cleaning tank to cleaning pipeline, and spray head 54 is arranged on cleaning pipeline 53;The inner wall of tank body and membrane distribution unit are cleaned by the cleaning liquid sprayed from spray head.

[0045] The tank body 11 of the evaporation tank is in a cylindrical shape, and can be made of stainless steel to ensure durability and safety and to adapt to the complex chemical properties of liquid waste.

[0046] The heating jacket 12 is sealingly connected with the tank body 11 to form a sealed space. The heating coil 13 is arranged in the sealed space formed by the heating jacket 12, and the heating jacket 12 can play a heat preservation role. The heating medium is introduced into the heating coil 13 to heat the tank body.

[0047] The heating jacket 12 can be made of carbon steel with a thickness of 8-15 mm. A high-temperature-resistant and corrosion-resistant ceramic coating is coated on the outer surface of the heating jacket 12 to improve the heat insulation and heat preservation performance and the chemical corrosion resistance, thereby reducing heat loss.

[0048] The heating coil 13 is spirally arranged on the outer wall of the tank body, and forms a spiral flow of heat on the outer wall of the tank body to increase the contact time and contact area between the heating medium and the tank body and improve the heat conduction efficiency.

[0049] The cross section of the heating coil 13 can be designed as a semicircular cross section to further increase the contact area between the heating medium and the tank body.

[0050] The heating coil 13 can be made of stainless steel.

[0051] For some heat-sensitive liquid hazardous waste, the temperature and flow of the heating medium can be controlled for low-temperature evaporation to prevent chemical reactions of the waste components and the generation of other harmful substances.

[0052] In some embodiments, referring to Figure 2 The film distribution unit 21 includes a rotating shaft 211 and a plurality of blades 212 arranged axially along the rotating shaft. The blades 212 are spirally arranged on the rotating shaft 211, and the blades are in a spiral shape with a spiral angle of 30°-60°. The number of blades 212 is 5-7.

[0053] The blade surface of the blade 212 is in a trapezoidal shape, and the upper base of the trapezoidal shape is connected with the rotating shaft and is arranged in a form of narrow inside and wide outside. The areas of the blades arranged from top to bottom along the rotating shaft are gradually increased, i.e., the area of the lower blade is greater than that of the upper blade. By increasing the area of the blade surface, the film distribution unit can fully act on the material after the material is sent into the film distribution unit, so that the material can be uniformly thrown onto the inner wall of the tank body.

[0054] A plurality of small protrusions 213 are arranged on the blade surface on the side of the blade 212 facing the rotating direction to increase the throwing and dispersing effect of the liquid and make the formed liquid film more uniform.

[0055] The arrangement of the cloth membrane unit structure can uniformly disperse and sprinkle the material into the inner wall of the tank and form a liquid film, so that the liquid can be rapidly evaporated and concentrated. The uniform thickness of the liquid film can also well ensure the stability and consistency of the evaporation process, avoid local insufficient or excessive evaporation, and improve the evaporation and concentration effect of the evaporation tank.

[0056] The driving mechanism can adopt a motor 22 and a speed reducer, etc. The motor 22 is installed at the top of the tank body 11, and the rotating shaft of the motor is connected with the rotating shaft 211 to drive the cloth membrane unit 21 to rotate at high speed.

[0057] The surface of the blade 212 is coated with a layer of polytetrafluoroethylene (PTFE) coating to improve the corrosion resistance of the blade and prolong the service life of the blade. It can also avoid the adhesion of liquid material on the surface of the blade, making it easier for the liquid material to separate from the blade.

[0058] The vacuum device includes a vacuum pump 21, a vacuum pipeline 32 and a vacuum valve 33. The vacuum pump 21 is connected with the tank body 11 through the vacuum pipeline 32, and the vacuum valve 33 is installed on the vacuum pipeline. The vacuum degree in the tank body is controlled and adjusted by the vacuum pump. In a vacuum environment, the boiling point of the liquid is significantly reduced, so that the liquid hazardous waste can be rapidly evaporated at a lower temperature, reducing energy consumption, and avoiding the generation of harmful substances or changes in waste properties caused by high temperature.

[0059] The negative pressure environment formed by the vacuum pump 31 in the tank body can help to push the steam flow to the condensing device, so that the steam can smoothly pass through the steam pipeline into the condensing device for condensation treatment, thereby improving the efficiency and smoothness of steam transmission.

[0060] Referring to Figure 3 In some embodiments, the condensing device 40 includes a tube shell 41, a condensing pipeline 42 and a baffle plate 44.

[0061] The condensing pipeline 42 is arranged in the tube shell 41 and communicates with the steam outlet 17, so that the steam can be sent into the condensing pipeline. The cooling medium is introduced into the cooling medium inlet of the tube shell 41 to condense the steam in the condensing pipeline. The cooling medium is discharged from the cooling medium outlet to realize the circulation of the cooling medium in the tube shell.

[0062] The baffle plate 44 is arranged in the tube shell 41 and is arranged axially spaced along the tube shell. The baffle plate 44 is sealingly connected between the tube shell 41 and the tube shell, and a gap 45 for the flow of cooling medium is provided between the tube shell and the tube shell. Adjacent gaps 45 are arranged in an upper and lower staggered manner, so as to form an S-shaped flow channel for the flow of cooling medium in the tube shell.

[0063] The condensing device 40 adopts a tube type structure and is connected with the steam outlet of the tank body through the steam pipeline.

[0064] In order to prevent the steam from being condensed in the condensing pipeline and causing the condensing pipeline to be blocked, the inner diameter of the condensing pipeline is optimized and designed, and the pipe diameter is set to be between 15-25 mm. A filter is arranged at the inlet of the condensing device to filter the impurities in the steam and ensure the smoothness of the condensing pipeline.

[0065] The baffle 44 arranged in the shell is in an arc structure, and the baffle 44 and the condensing pipeline 42 are arranged vertically to each other. A plurality of through holes are uniformly arranged on the baffle 44, and the through holes can be circular holes. At this time, when the cooling medium flows in the shell, longitudinal flow parallel to the condensing pipeline and transverse flow perpendicular to the condensing pipeline can be formed, and the cooling efficiency of the cooling medium is improved.

[0066] The size of the gap 45 between the baffle and the shell can be determined by the chord height of the gap, which accounts for the percentage of the diameter of the shell. The height of the baffle gap can be set to 20%-40% of the inner diameter of the shell, and the setting interval between the baffles can be adjusted according to the flow rate of the cooling medium, the flow rate of the steam, and the heat transfer efficiency, and can be set to be between 100-300 mm.

[0067] The gap 45 is arranged in a staggered manner, and the cooling medium flows tortuously in the shell, increasing the contact time between the cooling medium and the condensing pipeline and improving the heat exchange efficiency.

[0068] A rubber sealing structure can be used to seal between the baffle 44 and the shell 41.

[0069] The steam generated by the tank body 11 of the evaporation tank 10 enters the condensing device and exchanges heat with the cooling medium, realizing efficient condensation, ensuring timely recovery of the steam, avoiding pollution of the environment caused by steam emission, and recycling the recovered liquid for further processing or as a valuable resource.

[0070] A discharge pipeline is arranged at the discharge port 18 of the evaporation tank, and a discharge valve 19 is arranged on the discharge pipeline to control the discharge of the concentrated liquid. The discharge speed and flow rate can be accurately controlled through the discharge valve, and the evaporation process is not affected during the discharge process, ensuring the continuity and stability of the evaporation process.

[0071] The cleaning tank 51 and the cleaning pump 52 are arranged outside the evaporation tank, and are connected to the cleaning pipeline arranged in the tank body through the conveying pipeline. The cleaning pipeline can adopt a ring structure, and the nozzles are uniformly arranged on the cleaning pipeline. Part of the nozzles are arranged towards the inner wall of the tank body, and part of the nozzles are arranged towards the membrane unit, realizing cleaning operation of the inner wall of the tank body and the membrane unit.

[0072] The cleaning tank can be made of stainless steel, and the cleaning pipeline can be made of stainless steel pipe.

[0073] The cleaning liquid can be sprayed in a pulse mode, and the spray head is arranged in a rotatable structure, and the rotating speed is set to 10-30 rpm.

[0074] The spray heads arranged for cleaning the inner wall of the tank are arranged at the same spray angle in the circumferential direction, for example, the spray angle is set to 60°, so that the cleaning liquid forms a rotating flow on the inner wall of the tank, thereby improving the cleaning efficiency of the tank.

[0075] The cleaning frequency can be determined according to the running time of the concentration treatment device, the properties and concentration of the liquid hazardous waste treated, and other factors; for some high-concentration and easy-scaling liquid hazardous waste, the cleaning frequency can be set to once every 24-48 hours of operation; for low-concentration and non-scaling liquid hazardous waste, the cleaning frequency can be set to once every 72-96 hours of operation.

[0076] In the arrangement of the device, the evaporation tank is arranged at the center position as the core of the whole device; the cleaning tank is arranged on one side of the evaporation tank; the vacuum pump is connected with the evaporation tank through a vacuum pumping pipeline; and the condensing device is arranged on the other side of the evaporation tank, at a position lower than the evaporation tank, so that the generated steam can flow into the condenser for condensation by gravity. This arrangement is beneficial to the arrangement and connection of the steam pipeline and reduces the heat loss of the steam in the transmission process.

[0077] The treatment process of the liquid hazardous waste vacuum thin film evaporation concentration treatment device in this embodiment is as follows:

[0078] The liquid hazardous waste to be treated is transported into the tank through the feed inlet, and the feed inlet is arranged for the membrane distribution unit. The material is injected onto the membrane distribution unit, and the membrane distribution unit collides with the material when rotating at high speed, so that the material is uniformly scattered on the inner wall of the tank, forming a very thin liquid film on the inner wall of the tank. The liquid film formed on the inner wall of the tank increases the evaporation area, thereby improving the evaporation concentration efficiency.

[0079] The vacuum pump is used to pump the inside of the tank to a set vacuum degree. In the vacuum environment, the boiling point of the liquid is reduced, so that the liquid film can be quickly evaporated and concentrated at a lower temperature.

[0080] The heating medium (such as hot water, steam or heat conducting oil, etc.) is introduced into the heating coil in the outer jacket, and the heat is conducted to the tank to heat and evaporate the liquid film on the inner wall of the tank.

[0081] The steam generated in the tank is discharged through the steam outlet and transported to the condensing system. In the condensing system, the steam exchanges heat with the cooling medium (such as water or cooling liquid), so that the steam can be quickly cooled and condensed into liquid. The liquid obtained after cooling can be further treated or recycled as valuable resources.

[0082] When the concentrated liquid reaches a certain amount or concentration after evaporation and concentration, the discharge valve on the discharge port is opened, and the concentrated liquid in the tank body is discharged to facilitate subsequent processing or disposal.

[0083] When the device needs to be cleaned, the cleaning device is started, the cleaning liquid in the cleaning tank is pumped to the cleaning pipeline through the cleaning pump, and is sprayed to the inner wall of the tank body and the membrane unit through the spray head, so that the inner wall of the tank body and the membrane unit are cleaned to prevent scaling on the surface of the tank body and the membrane unit. The waste liquid after cleaning is discharged through a special pipeline for subsequent treatment.

[0084] In the description of the utility model, it needs to be explained that the adopted terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0085] In addition, in the description of the utility model, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or suspended, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0086] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication between two elements inside. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0087] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, and any simple modification, equivalent change of the above embodiment according to the technical essence of the utility model falls within the protection scope of the utility model.

Claims

1. A liquid hazardous waste vacuum thin film evaporation concentration treatment apparatus, characterized by, The application relates to a device for evaporating and condensing a material, comprising the following parts: an evaporation tank, comprising a tank body, a heating jacket is arranged outside the tank body, a feeding port, a vacuumizing port, a cleaning port and a steam outlet are arranged on the top of the tank body, and a discharging port is arranged on the bottom of the tank body; a film spreading device, comprising a film spreading unit arranged in the tank body and a driving mechanism for driving the film spreading unit to rotate, the film spreading unit can throw the material entering from the feeding port to the inner wall of the tank body when rotating; a vacuum device connected with the vacuumizing port, used for vacuumizing the tank body; a condensing device connected with the steam outlet, used for condensing the steam discharged from the steam outlet; a cleaning device, comprising a cleaning tank, a cleaning pump and a cleaning pipeline arranged in the tank body, the cleaning pump is used for pumping the cleaning liquid in the cleaning tank to the cleaning pipeline, and a spray head is arranged on the cleaning pipeline.

2. The liquid hazardous waste vacuum thin-film evaporation concentration treatment apparatus according to claim 1, characterized by, A heating coil is arranged around the tank body in the heating jacket.

3. The liquid hazardous waste vacuum thin-film evaporation concentration treatment apparatus according to claim 1, characterized by, The film spreading unit comprises a rotating shaft and a plurality of blades arranged on the rotating shaft in a spiral mode, the blade surface of the blades is in a trapezoidal shape, and the upper base of the trapezoidal shape is connected with the rotating shaft.

4. The liquid hazardous waste vacuum thin-film evaporation concentration treatment apparatus according to claim 3, characterized by The spiral angle of the blades is 30-60 degrees.

5. The liquid hazardous waste vacuum thin-film evaporation concentration treatment apparatus according to claim 3, characterized by A plurality of protrusions are arranged on the blade surface of the blades.

6. The liquid hazardous waste vacuum thin-film evaporation concentration treatment apparatus according to any one of claims 1 or 3 or 4 or 5, characterized in that, The feeding port is arranged on the tank body and close to the position above the film spreading unit, so that the material entering from the feeding port can be sent to the film spreading unit.

7. The liquid hazardous waste vacuum thin-film evaporation concentration treatment apparatus according to claim 1, characterized by The condensing device comprises a tube shell, a condensing pipeline and a plurality of baffles. The condensing pipeline is arranged in the tube shell and communicates with the steam outlet, the plurality of baffles are arranged along the tube shell in an axial direction, the baffles are sealingly connected with the tube shell and are provided with gaps for the flow of cooling medium between the baffles and the tube shell, adjacent gaps are arranged in an up-and-down staggered mode, so that an S-shaped flow channel is formed in the tube shell.

8. The liquid hazardous waste vacuum thin-film evaporation concentration treatment apparatus according to claim 7, characterized by The baffles are in an arc structure.

9. The liquid hazardous waste vacuum thin-film evaporation concentration treatment apparatus according to claim 7 or 8, characterized by A plurality of through holes are arranged on the baffles.

10. The liquid hazardous waste vacuum thin-film evaporation concentration treatment apparatus according to claim 9, characterized by, The height of the gaps between the baffles and the tube shell is 20-40% of the inner diameter of the tube shell.

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