Falling film evaporator

Abstract

The application discloses a novel falling film evaporator and belongs to the technical field of evaporators.The novel falling film evaporator comprises a main evaporator, a plurality of steam input holes are uniformly distributed on the peripheral side of a heat exchange assembly, a liquid distribution mechanism is installed between a connecting assembly and a liquid input assembly, a heat exchange mechanism is installed below the liquid distribution mechanism, a plurality of film forming auxiliary mechanisms matched with the heat exchange mechanism are threadedly connected to the liquid distribution mechanism, a steam input mechanism is fixedly installed outside the heat exchange assembly, two through air guide pipes are fixedly connected to the bottom of one side of the evaporator body, and a separation mechanism is fixedly connected to the other end of the two air guide pipes.The film forming auxiliary mechanism is designed, liquid is uniformly distributed in the form of extremely thin and uniform film on the inner wall of the film forming heat exchange pipeline after passing through the film forming cover, liquid can be heated more uniformly in the subsequent heat exchange process, and the heat exchange efficiency and heat exchange quality are ensured.

Description

Technical Field

[0001] This invention belongs to the field of evaporator technology, specifically relating to a novel falling film evaporator. Background Technology

[0002] A falling film evaporator is a commonly used heat exchange device, primarily used for the evaporation and concentration of liquids. Its working principle is as follows: the liquid to be evaporated is evenly distributed from the top of the device through nozzles or a distribution device onto the inner surface of the heat exchange tubes inside the evaporator, thus forming a thin film (i.e., "falling film") on the inner surface of the heat exchange tubes. This film flows downwards along the inner surface of the tubes. During this process, heat from the steam heating equipment is transferred to the liquid film. Due to the large area of ​​the liquid film and its high heat transfer efficiency, the heating process is relatively rapid, and low-boiling-point components in the liquid (such as water) begin to evaporate, forming steam. The evaporated steam is guided to a condenser or collection device through a dedicated pipeline or separation system. As evaporation continues, the remaining substances in the liquid (such as solutes and solvents) are concentrated. This concentrated liquid continues to flow along the inner surface of the heat exchange tubes and eventually flows out through a pipeline, while the steam obtained through evaporation can be cooled by the condenser and turned back into liquid, or directly discharged.

[0003] Falling film evaporators are typically suitable for processing liquids with low viscosity and good flowability, including common concentrated chemicals, concentrated fruit juices in the food industry, and pharmaceutical production. Currently, there are various types of falling film evaporators on the market, but existing evaporator designs still have certain shortcomings. First, current evaporator liquid distribution devices generally use gravity flow to allow the liquid to flow downwards along the inner wall of the heat exchange tubes, thus forming a thin film structure inside the tubes. While this achieves heat exchange and evaporation, this gravity flow method easily leads to uneven distribution of the liquid film thickness, which in turn affects the evaporation efficiency to some extent. Simultaneously, existing steam input devices usually input from one side, causing uneven heating of the heat exchange tubes at different locations, which also affects evaporation efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a novel falling film evaporator.

[0005] The technical solution adopted to solve the above technical problems is: a new falling film evaporator, including a main evaporator, wherein the main evaporator includes a concentrate discharge assembly, an evaporator body, a heat exchange assembly, a connecting assembly and a liquid input assembly bolted together from bottom to top, and the heat exchange assembly has a plurality of uniformly distributed steam input holes on its periphery; A liquid distribution mechanism is installed between the connecting component and the liquid input component, and a heat exchange mechanism is installed below the liquid distribution mechanism. The liquid distribution mechanism is threaded with multiple film-forming auxiliary mechanisms that match the heat exchange mechanism, so that the liquid flowing down from the liquid distribution mechanism can be evenly distributed in a thin film on the inner wall of the pipe inside the heat exchange mechanism through the film-forming auxiliary mechanisms, and can prevent the steam generated in the pipe during the heat exchange process from moving upward through the film-forming auxiliary mechanisms. A steam input mechanism is fixedly installed on the outside of the heat exchange component to input high-temperature steam from the outside, thereby exchanging heat with the thin film material flowing downward inside the heat exchange component. Two through-hole gas guide pipes are fixedly connected to the bottom of one side of the evaporator body, and a separation mechanism is fixedly connected to the other end of the two gas guide pipes.

[0006] Furthermore, one side of the outer wall of the evaporator body is provided with a degassing port, a condensate drain port and a side drain port from top to bottom.

[0007] With the above technical solution, the degassing port and condensate drain port are located in the stroke stage of the heat exchange mechanism. During the heat exchange process, high-temperature steam will form condensate after heat exchange and accumulate at the bottom, and finally be discharged through the condensate drain port. Excess gas in this stroke will be discharged through the degassing port. The side drain port is located on one side of the evaporator body near the bottom. A valve is generally installed at its outlet. Under normal conditions, it is normally closed. The concentrate will only be discharged through the side drain port when the discharge port at the bottom of the concentrate discharge component is faulty or under maintenance.

[0008] Furthermore, an upper support frame is fixedly connected to the inner wall of the connecting assembly, and a lower support frame is fixedly connected to the inner wall of the evaporator body.

[0009] Through the above technical solution, the upper support frame and the lower support frame are mainly used for the support and installation of the heat exchange mechanism, so that the heat exchange mechanism can be stably installed inside the evaporator body. At the same time, the heat exchange mechanism can also provide stable support for the liquid distribution mechanism at its top.

[0010] Furthermore, the liquid distribution mechanism includes a liquid collection hopper and a liquid distribution plate stacked from top to bottom. The bottom periphery of the liquid collection hopper is provided with multiple evenly distributed arc-shaped drainage holes. The bottom of the liquid collection hopper is provided with a mounting post, and a liquid distribution cover is threadedly connected to the mounting post. The bottom of the liquid collection hopper is also provided with multiple evenly distributed threaded grooves, and the liquid distribution plate is provided with multiple evenly distributed diversion holes.

[0011] Through the above technical solution, the liquid distribution mechanism is mainly used to uniformly distribute the liquid input from the liquid input component. First, the liquid injected from the top of the liquid input component falls onto the liquid distribution cover. Since the liquid distribution cover is spherical, the liquid flows along the surface of the liquid distribution cover to the periphery of the liquid collection hopper, and then flows into the liquid equalization plate below through the arc-shaped drainage hole. During this process, the liquid flows from the periphery to the center of the liquid equalization plate, thus ensuring the uniformity of liquid distribution. At the same time, since the liquid equalization plate is provided with multiple evenly distributed diversion holes, the liquid on the liquid equalization plate flows downward through multiple diversion holes, and finally enters the heat exchange mechanism after passing through the film forming auxiliary mechanism.

[0012] Furthermore, the heat exchange mechanism includes an upper distribution plate and a lower distribution plate, on which a plurality of uniformly distributed film-forming drainage holes are formed. A plurality of film-forming heat exchange pipes communicating with the corresponding film-forming drainage holes are fixedly connected between the upper distribution plate and the lower distribution plate. The upper distribution plate and the lower distribution plate are respectively fixed on the upper support frame and the lower support frame, and the liquid distribution mechanism is supported on the top of the upper distribution plate.

[0013] Through the above technical solution, the heat exchange mechanism, as the main heat exchange structure, in actual operation, the liquid, with the assistance of the film-forming auxiliary mechanism, is evenly distributed in a thin film on the inner wall of multiple film-forming heat exchange pipes and flows downward naturally under the action of gravity. During this process, the high-temperature steam input by the steam input mechanism enters the inner wall of the heat exchange component through multiple evenly distributed steam input holes and comes into full contact with multiple film-forming heat exchange pipes. Thus, the thin film liquid flowing downward in the film-forming heat exchange pipes can be quickly heated through heat exchange, causing the liquid to evaporate and generate steam. The condensate generated after evaporation will drip into the condensate discharge component under the action of gravity for collection and discharge. The steam generated in this process will also move downward synchronously and enter the lower part of the evaporator body through the film-forming drainage hole at the bottom of the lower distribution plate. At the same time, the high-temperature steam input by the steam input mechanism will form condensate after encountering cold heat exchange. It will also flow downward along the pipe wall of the film-forming heat exchange pipe under the action of gravity and accumulate above the lower distribution plate, and finally be discharged through the condensate drain outlet. A small amount of excess gas will be discharged through the degassing port.

[0014] Furthermore, the film-forming auxiliary mechanism includes a fixed rod threaded into a threaded groove, a pressure-adjusting float slidably mounted on the outer wall of the fixed rod, a film-forming cover fixedly connected to the bottom of the fixed rod, and a screwing part provided on the outer wall of the fixed rod near the top.

[0015] Through the above technical solution, the film-forming auxiliary mechanism is an important auxiliary tool for forming a uniform thin film structure of liquid. During the processing, the liquid flowing downward through the diversion hole will first fall onto the pressure regulating float. Due to its overall cone-shaped structure, the liquid will flow and diffuse along its surface, eventually falling onto the upper diversion plate. It will not directly enter the film-forming drainage hole of the upper diversion plate. At this point, the liquid, after being buffered and diverted by the upper diversion plate, can reduce the oscillation amplitude of the pressure regulating float. More importantly, since the pressure regulating float can slide on the fixed rod, when the liquid falls onto the upper diversion plate and gradually accumulates, the buoyancy of the liquid allows the pressure regulating float to slide upward. When the liquid level on the upper diversion plate is higher than the normal height, the pressure regulating float moves upward, thereby reducing the flow at the diversion hole. When the liquid level on the upper distribution plate is lower than the normal height, the pressure regulating float moves down, thereby increasing the flow rate at the distribution orifice. This allows the pressure regulating float to automatically adjust the liquid storage capacity on the upper distribution plate, maintaining a stable level and preventing excessive or insufficient liquid levels. This also avoids fluctuations in flow rate and velocity when the liquid enters the film-forming drainage orifice. Furthermore, after the liquid enters the film-forming drainage orifice, the film-forming cover, located inside, further distributes the incoming liquid evenly. After passing through the film-forming cover, the liquid forms an extremely thin and uniform film that is evenly distributed on the inner wall of the film-forming heat exchange pipe. This ensures more uniform heating during subsequent heat exchange, guaranteeing heat exchange efficiency and quality, while also improving the purity of the concentrate.

[0016] Furthermore, the top of the fixing rod passes through the corresponding diversion hole, and the film-forming cover is positioned in the film-forming drainage hole on the upper diversion plate, so that an annular gap hole is formed between the film-forming cover and the diversion hole, and the liquid can flow downward through the annular gap hole and form a uniform thin film structure on the inner wall of the film-forming heat exchange pipe.

[0017] Furthermore, the steam input mechanism includes an annular heat insulation cover fixed to the outside of the heat exchange component. The front and rear ends of the annular heat insulation cover are provided with steam inlets. The front and rear ends of the inner wall of the annular heat insulation cover are fixedly connected with air guide plates for guiding the flow. A steam diversion pipe is fixedly connected between the two steam inlets. A steam input pipe that communicates with the steam diversion pipe is fixedly connected to the middle of the steam diversion pipe.

[0018] Through the above technical solution, the steam input mechanism is mainly used for the input and diversion of high-temperature steam. During operation, the high-temperature steam enters the steam distribution pipe through the steam input pipe, and then enters the annular heat insulation cover through the steam inlets at both ends of the steam distribution pipe. Since two inclined air guide plates are fixed on the inner wall of the annular heat insulation cover, the high-temperature steam entering moves in an arc shape along the inner wall of the annular heat insulation cover under the action of the air guide plates. This allows the high-temperature steam to enter the heat exchange component through multiple evenly distributed steam input holes, which not only ensures the uniformity of high-temperature steam distribution, but also ensures heat exchange efficiency and heat exchange quality.

[0019] Furthermore, the separation mechanism includes a separator fixed to one end of two air guide pipes, the top of the separator is provided with a steam exhaust port, and the bottom of the separator is provided with a condensate drain port.

[0020] Through the above technical solution, during the heat exchange process, the steam separated from the liquid after heat exchange will enter the lower part of the evaporator body, and then enter the separator through two gas guide pipes, so that the steam is further cooled and separated. The condensate generated by cooling will be discharged through the bottom condensate drain, while the excess steam will be discharged through the top steam exhaust port. The discharged steam can be recycled or filtered and then directly discharged according to actual needs.

[0021] Furthermore, the outer wall of the evaporator body is fixedly connected with a plurality of evenly distributed fixing ears.

[0022] Through the above technical solution, multiple fixing ears are used for the installation and fixation of the evaporator body to ensure the stable operation of the equipment.

[0023] The beneficial effects of the present invention are as follows: (1) The present invention designs a film-forming auxiliary mechanism so that the film-forming cover can play a role in redistributing the liquid flowing in. After the liquid passes through the film-forming cover, it will be evenly distributed on the inner wall of the film-forming heat exchange pipe in the form of an extremely thin and uniform film, so that the liquid can be heated more evenly in the subsequent heat exchange process, and the heat exchange efficiency and heat exchange quality are guaranteed. At the same time, the purity of the concentrate is also improved. Meanwhile, its simple structural design is also convenient for daily maintenance and quick replacement. (2) The present invention designs an improved steam input mechanism so that the high-temperature steam entering moves in an arc shape along the inner wall of the annular heat insulation cover under the action of the air guide plate. This allows the high-temperature steam to enter the heat exchange component through multiple evenly distributed steam input holes, which not only ensures the uniformity of the high-temperature steam distribution, but also ensures the heat exchange efficiency and heat exchange quality. Attached Figure Description

[0024] Figure 1 This is a first-view structural diagram of the present invention; Figure 2 This is a second-view structural diagram of the present invention; Figure 3 This is the front view of the present invention; Figure 4 yes Figure 3 Sectional view along line AA; Figure 5 This is the right view of the present invention; Figure 6 yes Figure 5 Sectional view along the BB direction; Figure 7 This is a schematic diagram of the liquid distribution mechanism of the present invention; Figure 8 This is a cross-sectional view of the liquid distribution mechanism of the present invention; Figure 9 This is a schematic diagram of the heat exchange mechanism of the present invention; Figure 10 This is a front view of the heat exchange mechanism of the present invention; Figure 11 yes Figure 10 C-axis sectional view; Figure 12 yes Figure 11 A magnified view of a section at point A in the middle; Figure 13 This is a schematic diagram of the film-forming auxiliary mechanism of the present invention; Figure 14 This is a schematic diagram of the heat exchange component of the present invention; Figure 15 This is a schematic diagram of the installation structure of the steam input mechanism of the present invention; Figure 16 yes Figure 15 3D sectional view along the DD direction; Figure 17 yes Figure 15 EE-directed sectional view; Figure 18 This is a schematic diagram of the steam input mechanism of the present invention.

[0025] Reference numerals: 1. Main evaporator; 101. Evaporator body; 102. Heat exchange assembly; 103. Connection assembly; 104. Liquid input assembly; 105. Concentrate discharge assembly; 106. Steam input port; 107. Degassing port; 108. Condensate drain port; 109. Side drain port; 110. Upper support frame; 111. Lower support frame; 2. Liquid distribution mechanism; 201. Liquid collection hopper; 202. Liquid distribution plate; 203. Arc-shaped drainage hole; 204. Mounting column; 205. Liquid distribution hood; 206. Threaded groove; 207. Diversion hole; 3. Heat exchanger Mechanism; 301, Upper distribution plate; 302, Lower distribution plate; 303, Film-forming drainage hole; 304, Film-forming heat exchange pipe; 4, Film-forming auxiliary mechanism; 401, Fixing rod; 402, Pressure regulating float; 403, Film-forming cover; 404, Tightening part; 5, Steam input mechanism; 501, Annular insulation cover; 502, Steam inlet; 503, Air guide plate; 504, Steam distribution pipe; 505, Steam input pipe; 6, Air guide pipe; 7, Separation mechanism; 701, Separator; 702, Steam exhaust port; 703, Condensate drain port; 8, Fixing lug. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] like Figures 1-18 As shown, a novel falling film evaporator of this embodiment includes a main evaporator 1. The main evaporator 1 includes a concentrate discharge assembly 105, an evaporator body 101, a heat exchange assembly 102, a connecting assembly 103 and a liquid input assembly 104, which are bolted together from bottom to top. The heat exchange assembly 102 has a plurality of uniformly distributed steam input holes 106 on its periphery. In this embodiment, the outer wall of the evaporator body 101 is provided with a degassing port 107, a condensate drain port 108, and a side drain port 109 from top to bottom on one side. The degassing port 107 and the condensate drain port 108 are located in the stroke stage of the heat exchange mechanism 3. During the heat exchange process, the high-temperature steam will form condensate after heat exchange and accumulate at the bottom, and finally be discharged through the condensate drain port 108. The excess gas in this stroke will be discharged through the degassing port 107. The side drain port 109 is located on one side of the evaporator body 101 near the bottom. A valve is generally installed at its outlet. Under normal conditions, it is normally closed. The concentrate will only be discharged through the side drain port 109 when the discharge port at the bottom of the concentrate discharge assembly 105 is in failure or under maintenance.

[0028] In this embodiment, an upper support frame 110 is fixedly connected to the inner wall of the connecting component 103, and a lower support frame 111 is fixedly connected to the inner wall of the evaporator body 101. The upper support frame 110 and the lower support frame 111 are mainly used for supporting and fixing the heat exchange mechanism 3, so that the heat exchange mechanism 3 can be stably installed inside the evaporator body 101. At the same time, the heat exchange mechanism 3 can also provide stable support for the liquid distribution mechanism 2 at its top.

[0029] Regarding liquid distribution mechanism 2, please refer to... Figures 6-8 A liquid distribution mechanism 2 is installed between the connecting component 103 and the liquid input component 104. The liquid distribution mechanism 2 includes a liquid collecting hopper 201 and a liquid equalization plate 202 stacked from top to bottom. The bottom periphery of the liquid collecting hopper 201 has multiple evenly distributed arc-shaped drainage holes 203. The bottom of the liquid collecting hopper 201 has a mounting post 204, and a liquid distribution cover 205 is threadedly connected to the mounting post 204. The bottom of the liquid collecting hopper 201 also has multiple evenly distributed threaded grooves 206. The liquid equalization plate 202 has multiple evenly distributed diversion holes 207. The liquid distribution mechanism 2 is mainly used for the even distribution of liquid input from the liquid input component 104. First, through the liquid... The liquid injected from the top of the liquid input component 104 falls onto the liquid distribution cover 205. Since the liquid distribution cover 205 is spherical, the liquid flows along the surface of the liquid distribution cover 205 to the periphery of the liquid collection hopper 201, and then flows into the liquid distribution plate 202 below through the arc-shaped drainage hole 203. During this process, the liquid flows from the periphery to the center of the liquid distribution plate 202, thus ensuring the uniformity of liquid distribution. At the same time, since the liquid distribution plate 202 is provided with multiple evenly distributed diversion holes 207, the liquid on the liquid distribution plate 202 flows downward through the multiple diversion holes 207, and finally enters the heat exchange mechanism 3 after passing through the film forming auxiliary mechanism 4.

[0030] Regarding heat exchange mechanism 3, please refer to... Figures 9-12Below the liquid distribution mechanism 2, a heat exchange mechanism 3 is installed. The heat exchange mechanism 3 includes an upper distribution plate 301 and a lower distribution plate 302. Multiple uniformly distributed film-forming drainage holes 303 are opened on the upper and lower distribution plates 301 and 302. Multiple film-forming heat exchange pipes 304, communicating with the corresponding film-forming drainage holes 303, are fixedly connected between the upper and lower distribution plates 301 and 302. The upper and lower distribution plates 301 and 302 are respectively fixed on the upper support frame 110 and the lower support frame 111, and the liquid distribution mechanism 2 is supported on the top of the upper distribution plate 301. As the main heat exchange structure, during actual operation, the liquid, with the assistance of the film-forming auxiliary mechanism 4, is uniformly distributed in a thin film on the inner wall of the multiple film-forming heat exchange pipes 304 and flows downward naturally under gravity. During this process, the high-temperature steam input by the steam input mechanism 5 passes through multiple uniformly distributed steam... The inlet 106 enters the inner wall of the heat exchange component 102 and comes into full contact with multiple film-forming heat exchange pipes 304. This allows for rapid heating of the thin film liquid flowing downwards in the film-forming heat exchange pipes 304 through heat exchange, causing the liquid to evaporate and generate steam. The condensate produced after evaporation drips into the condensate discharge component 105 under gravity for collection and discharge. The steam generated during this process also moves downwards and enters the lower part of the evaporator body 101 through the film-forming drainage hole 303 at the bottom of the lower distribution plate 302. At the same time, the high-temperature steam input through the steam input mechanism 5 forms condensate after encountering cold heat exchange. This condensate also flows downwards along the pipe wall of the film-forming heat exchange pipes 304 under gravity and accumulates above the lower distribution plate 302, eventually being discharged through the condensate drain outlet 108. A small amount of excess gas is discharged through the degassing outlet 107.

[0031] Regarding film-forming auxiliary mechanism 4, refer to... Figures 12-13The liquid distribution mechanism 2 is threadedly connected to multiple film-forming auxiliary mechanisms 4 that match the heat exchange mechanism 3. This allows the liquid flowing down from the liquid distribution mechanism 2 to be evenly distributed in a thin film on the inner wall of the pipe inside the heat exchange mechanism 3 via the film-forming auxiliary mechanisms 4, and prevents the steam generated in the pipe during the heat exchange process from moving upward via the film-forming auxiliary mechanisms 4. The film-forming auxiliary mechanism 4 includes a fixed rod 401 threadedly connected to a threaded groove 206. A pressure regulating float 402 is slidably installed on the outer wall of the fixed rod 401. A film-forming cover 403 is fixedly connected to the bottom of the fixed rod 401. A screwing part is provided on the outer wall of the fixed rod 401 near the top. 404, the film-forming auxiliary mechanism 4 is an important auxiliary tool for forming a uniform thin film structure of liquid. During the processing, the liquid flowing downward through the diversion hole 207 will first fall onto the pressure regulating float 402. Due to its overall cone-shaped upper part, the liquid will flow and diffuse along its surface to the surrounding areas, and finally fall onto the upper diversion plate 301. Moreover, it will not directly enter the film-forming drainage hole 303 of the upper diversion plate 301. At this time, after the liquid is buffered and diverted by the upper diversion plate 301, the oscillation amplitude of the pressure regulating float 402 can be reduced. More importantly, because the pressure regulating float 402 can be fixed on the rod 4 The pressure regulating float 402 slides upwards as liquid falls onto the upper distribution plate 301 and gradually accumulates. Due to buoyancy, the float 402 slides upwards. When the liquid level on the upper distribution plate 301 is higher than normal, the float 402 moves upwards, reducing the flow rate at the diversion orifice 207. When the liquid level on the upper distribution plate 301 is lower than normal, the float 402 moves downwards, increasing the flow rate at the diversion orifice 207. This allows the float 402 to automatically adjust the liquid storage capacity on the upper distribution plate 301, maintaining it in a stable state. This avoids situations where there is too much or too little liquid, thus preventing fluctuations in flow rate and velocity when the liquid enters the film-forming drainage hole 303. Furthermore, after the liquid enters the film-forming drainage hole 303, since the film-forming cover 403 is also located inside the film-forming drainage hole 303, the film-forming cover 403 can further distribute the incoming liquid. After passing through the film-forming cover 403, the liquid will be evenly distributed on the inner wall of the film-forming heat exchange pipe 304 in an extremely thin and uniform film form, so that the liquid can be heated more evenly in the subsequent heat exchange process, ensuring heat exchange efficiency and heat exchange quality, while also improving the purity of the concentrate.

[0032] Furthermore, in this embodiment, due to the setting of the film-forming cover 403, the steam generated in the film-forming heat exchange pipe 304 during the heat exchange process can only move downwards, preventing the steam from flowing upwards into the liquid input component 104 and affecting the liquid distribution operation.

[0033] In this embodiment, the top end of the fixing rod 401 passes through the corresponding diversion hole 207, and the film-forming cover 403 is positioned inside the film-forming drainage hole 303 on the upper diversion plate 301, so that an annular gap hole is formed between the film-forming cover 403 and the diversion hole 207, and the liquid can flow downward through the annular gap hole and form a uniform thin film structure on the inner wall of the film-forming heat exchange pipe 304.

[0034] Regarding steam input mechanism 5, see reference... Figures 14-18 A steam input mechanism 5 is fixedly installed on the outside of the heat exchange component 102 for inputting high-temperature steam from the outside, thereby exchanging heat with the thin film material flowing downward inside the heat exchange component 3. The steam input mechanism 5 includes an annular heat insulation cover 501 fixed to the outside of the heat exchange component 102. Steam inlets 502 are opened at both the front and rear ends of the annular heat insulation cover 501. Guide plates 503 for guiding flow are fixedly connected to both the front and rear ends of the inner wall of the annular heat insulation cover 501. A steam diversion pipe 504 is fixedly connected between the two steam inlets 502. A steam input pipe 505 communicating with the middle of the steam diversion pipe 504 is fixedly connected to the middle of the steam diversion pipe 504. The steam input mechanism 5 mainly... Used for the input and diversion of high-temperature steam, during operation, high-temperature steam enters the steam distribution pipe 504 through the steam input pipe 505, and then enters the annular heat insulation cover 501 through the steam inlet 502 at both ends of the steam distribution pipe 504. Since two inclined air guide plates 503 are fixed on the inner wall of the annular heat insulation cover 501, the high-temperature steam entering moves in an arc shape along the inner wall of the annular heat insulation cover 501 under the action of the air guide plates 503. This allows the high-temperature steam to enter the heat exchange component 102 through multiple evenly distributed steam input holes 106, ensuring both the uniformity of high-temperature steam distribution and the heat exchange efficiency and quality.

[0035] Regarding separation mechanism 7, refer to... Figures 1-6 Two through-hole air pipes 6 are fixedly connected to the bottom of one side of the evaporator body 101. The other end of the two air pipes 6 is fixedly connected to a separation mechanism 7. The separation mechanism 7 includes a separator 701 fixed to one end of the two air pipes 6. The top of the separator 701 is provided with a steam exhaust port 702 and the bottom of the separator 701 is provided with a condensate drain port 703. During the heat exchange process, the steam separated from the liquid after heat exchange will enter the lower part of the evaporator body 101, and then enter the separator 701 through the two air pipes 6, so that the steam is further cooled and separated. The condensate generated by cooling will be discharged through the bottom condensate drain port 703, while the excess steam will be discharged through the top steam exhaust port 702. The discharged steam can be recycled or filtered and discharged directly according to actual needs.

[0036] In this embodiment, a plurality of evenly distributed fixing ears 8 are fixedly connected to the outer wall periphery of the evaporator body 101. The plurality of fixing ears 8 are used for the installation and fixing of the evaporator body 101 to ensure the stable operation of the equipment.

[0037] The working principle of this embodiment is as follows: Liquid is continuously injected through the top of the liquid input component 104. At this time, the liquid will fall on the liquid distribution cover 205. The liquid will flow along the surface of the liquid distribution cover 205 to the periphery of the liquid collection hopper 201. Then, it will flow into the liquid equalization plate 202 below through the arc-shaped drainage hole 203. Then, the liquid will flow downward through the diversion hole 207. The liquid flowing downward through the diversion hole 207 will first fall on the pressure regulating float 402. The liquid will flow and spread along its surface to the periphery. Finally, it will fall on the upper diversion plate 301. At this time, the pressure regulating float 402 can be used to automatically adjust the storage capacity of the liquid on the upper diversion plate 301 so that it can always be kept in a stable state, avoiding large flow rate and velocity fluctuations when the liquid enters the film forming drainage hole 303. Then the liquid will flow into multiple film-forming drainage holes 303. After passing through the film-forming cover 403, the liquid will be evenly distributed on the inner wall of the film-forming heat exchange pipe 304 in the form of an extremely thin and uniform film and flow downward. During this process, the high-temperature steam input by the steam input mechanism 5 enters the inner wall of the heat exchange component 102 through multiple evenly distributed steam input holes 106 and comes into full contact with multiple film-forming heat exchange pipes 304. This allows the thin film liquid flowing downward in the film-forming heat exchange pipes 304 to be heated rapidly through heat exchange. The liquid evaporates after being heated to generate steam, and the concentrate generated after evaporation drips into the concentrate discharge component 105 under the action of gravity for collection and discharge. The steam generated during this process also moves downward synchronously and enters the lower part of the evaporator body 101 through the film-forming drainage hole 303 at the bottom of the lower distribution plate 302. Then the steam enters the separator 701 through two air guide pipes 6, thereby further cooling and separating the steam. The condensate produced by cooling will be discharged through the bottom condensate drain 703, while the excess steam will be discharged through the top steam exhaust port 702. The discharged steam can be recycled or filtered and discharged directly according to actual needs.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A falling film evaporator, comprising a main evaporator (1), wherein the main evaporator (1) comprises, from bottom to top, a concentrate discharge assembly (105), an evaporator body (101), a heat exchange assembly (102), a connecting assembly (103), and a liquid input assembly (104) bolted together, characterized in that: The heat exchange component (102) has a plurality of uniformly distributed steam inlet holes (106) on its periphery. A liquid distribution mechanism (2) is installed between the connecting component (103) and the liquid input component (104). The liquid distribution mechanism (2) includes a liquid collecting hopper (201) and a liquid equalization plate (202) stacked from top to bottom. The liquid collecting hopper (201) has multiple evenly distributed arc-shaped drainage holes (203) on its bottom periphery. The liquid collecting hopper (201) has a mounting post (204) at its bottom. A liquid distribution cover (205) is threaded onto the mounting post (204). The liquid collecting hopper (201) also has multiple evenly distributed threaded grooves (206) at its bottom. The liquid equalization plate (202) has multiple evenly distributed diversion holes (207). A heat exchange mechanism (3) is installed below the liquid distribution mechanism (2). The liquid distribution mechanism (2) is threaded with multiple film-forming auxiliary mechanisms (4) that match the heat exchange mechanism (3), so that the liquid flowing down from the liquid distribution mechanism (2) can be evenly distributed in a thin film on the inner wall of the pipe inside the heat exchange mechanism (3) through the film-forming auxiliary mechanism (4), and can prevent the steam generated in the pipe during the heat exchange process from moving upward through the film-forming auxiliary mechanism (4). The film-forming auxiliary mechanism (4) includes a fixed rod (401) threadedly connected in a threaded groove (206), a pressure regulating float (402) slidably installed on the outer wall of the fixed rod (401), a film-forming cover (403) fixedly connected to the bottom of the fixed rod (401), and a screwing part (404) provided on the outer wall of the fixed rod (401) near the top. The top of the fixed rod (401) passes through the corresponding diversion hole (207), and the film forming cover (403) is positioned in the film forming guide hole (303) on the upper diversion plate (301), so that an annular gap hole is formed between the film forming cover (403) and the diversion hole (207), and the liquid can flow downward through the annular gap hole and form a uniform thin film structure on the inner wall of the film forming heat exchange pipe (304); A steam input mechanism (5) is fixedly installed on the outside of the heat exchange component (102) for inputting high-temperature steam introduced from the outside, thereby exchanging heat with the thin film material flowing downward inside the heat exchange component (3); Two through-hole gas guide pipes (6) are fixedly connected to the bottom of one side of the evaporator body (101), and a separation mechanism (7) is fixedly connected to the other end of the two gas guide pipes (6).

2. The falling film evaporator according to claim 1, characterized in that, The outer wall of the evaporator body (101) is provided with a degassing port (107), a condensate drain port (108) and a side drain port (109) from top to bottom on one side.

3. The falling film evaporator according to claim 1, characterized in that, An upper support frame (110) is fixedly connected to the inner wall of the connecting assembly (103), and a lower support frame (111) is fixedly connected to the inner wall of the evaporator body (101).

4. The falling film evaporator according to claim 3, characterized in that, The heat exchange mechanism (3) includes an upper distribution plate (301) and a lower distribution plate (302). The upper distribution plate (301) and the lower distribution plate (302) are provided with a plurality of uniformly distributed film-forming drainage holes (303). A plurality of film-forming heat exchange pipes (304) that communicate with the corresponding film-forming drainage holes (303) are fixedly connected between the upper distribution plate (301) and the lower distribution plate (302). The upper distribution plate (301) and the lower distribution plate (302) are respectively fixed on the upper support frame (110) and the lower support frame (111), and the liquid distribution mechanism (2) is supported on the top of the upper distribution plate (301).

5. The falling film evaporator according to claim 1, characterized in that, The steam input mechanism (5) includes an annular heat insulation cover (501) fixed to the outside of the heat exchange component (102). The front and rear ends of the annular heat insulation cover (501) are provided with steam inlets (502). The front and rear ends of the inner wall of the annular heat insulation cover (501) are fixedly connected with air guide plates (503) for guiding the flow. A steam diversion pipe (504) is fixedly connected between the two steam inlets (502). A steam input pipe (505) is fixedly connected to the middle of the steam diversion pipe (504) and communicates with it.

6. The falling film evaporator according to claim 1, characterized in that, The separation mechanism (7) includes a separator (701) fixed to one end of two air guide pipes (6). The top of the separator (701) is provided with a steam exhaust port (702), and the bottom of the separator (701) is provided with a condensate drain port (703).

7. The falling film evaporator according to claim 1, characterized in that, The outer wall of the evaporator body (101) is fixedly connected with a plurality of evenly distributed fixing ears (8).

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