Falling film evaporator

Abstract

The utility model discloses a falling film evaporator which comprises a supporting leg, one end of the supporting leg is connected with a reaction tank, a feeding pipe is arranged in the middle of the top end of the reaction tank, an air inlet pipe is arranged above the side face of the supporting leg, an air outlet pipe is arranged at the position, away from the air inlet pipe, above the side face of the supporting leg, and a condensate pipe is arranged below the side face of the supporting leg. Under the action of a cone, non-uniform flow distribution caused by direct impact on a second filter plate is avoided, flow is uniformly distributed in a preheating pipe through leakage holes in a first filter plate, foam on the second filter plate can be isolated above the second filter plate under the blocking of water flow at the moment, then a valve on an air inlet pipe is opened, and the air inlet pipe is closed. At the moment, the high temperature is uniformly distributed outside the preheating pipe, so that the liquid uniformly distributed in the preheating pipe can be heated, the heated stock solution is discharged through the discharging pipe, the internal high-temperature gas is discharged through the gas outlet pipe, and the internal condensate is discharged through the assistance of the condensate pipe and the emptying pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators, in particular to a falling film evaporator. Background Art

[0002] The liquid distributor is a key component of the falling film evaporator. The heat exchange intensity and production capacity of the falling film evaporator essentially depend on the uniformity of the liquid distribution along the heat exchange tubes. The so-called uniform distribution not only means that the liquid should be evenly distributed in each tube, but also evenly distributed along the entire periphery of each tube and maintain its uniformity over the entire length of the tube. When the liquid cannot evenly wet the inner surface of all heating tubes, the surface lacking liquid or less liquid may scale due to evaporation, and the scaled surface in turn blocks the flow of the liquid film.

[0003] In addition, when the feed liquid is injected into the reaction tank through the pipeline, a lot of foam will be generated. These foams are easy to adhere to the tube wall, which will cause scaling on the tube wall over time. Therefore, in the process of falling film injection, the foam generated by the feed liquid needs to be separated from the liquid and evenly injected into each preheating tube. For this purpose, this scheme proposes a falling film evaporator. Utility Model Content

[0004] The utility model aims to solve the defect in the prior art that foam easily causes scaling of the tube wall, and proposes a falling film evaporator.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A falling film evaporator comprises a supporting leg, one end of which is connected to a reaction tank, a feed pipe is arranged in the middle of the top of the reaction tank, an air inlet pipe is arranged above the side of the supporting leg, an air outlet pipe is arranged above the side of the supporting leg away from the air inlet pipe, a condensate pipe is arranged below the side of the supporting leg, a drain pipe is arranged below the side of the supporting leg away from the condensate pipe, a discharge pipe is arranged in the middle of the bottom end of the reaction tank, a first filter plate is welded to the upper part of the interior of the reaction tank, a second filter plate is welded to the upper part of the interior of the reaction tank above the first filter plate, and a cone is connected to the middle of the top of the second filter plate.

[0007] Preferably, the connection ports of the feed pipe, air inlet pipe, air outlet pipe, condensate pipe, drain pipe and discharge pipe are all provided with electric valves.

[0008] Preferably, a first receiving plate is welded at the lower part of the interior of the reaction tank, a hole is opened at the top of the first receiving plate, and a preheating tube is sleeved on the top of the first receiving plate in the hole.

[0009] Preferably, a second receiving plate is sleeved on the upper part of the interior of the reaction tank, a hole is opened on the top of the second receiving plate, and the second receiving plate is located in the hole and sleeved with the preheating tube.

[0010] Preferably, the top end of the reaction tank is a curved surface, and the bottom end of the reaction tank is a curved surface.

[0011] Preferably, a leakage hole is opened on the top of the first filter plate, and a leakage hole is opened on the top of the second filter plate.

[0012] The utility model has the following beneficial effects:

[0013] By opening the valve on the feed pipe, the feed liquid is injected into the reaction tank. At this time, the feed liquid is affected by the cone to avoid direct impact on the second filter plate, which leads to uneven diversion. At this time, the feed liquid will produce foam during the impact process. The leakage holes on the surface of the second filter plate will directly enter the top of the first filter plate, and then evenly divert through the leakage holes on the first filter plate into the preheating tube. At this time, the foam on the second filter plate can be isolated above the second filter plate under the obstruction of the water flow, and then the valve on the air inlet pipe is opened. At this time, the high temperature is evenly distributed outside the preheating tube, so that the uniformly distributed liquid in the preheating tube can be heated, and the heated raw liquid is discharged through the discharge pipe, and the internal high-temperature gas is discharged through the outlet pipe, and the internal condensate is discharged through the condensate pipe and the drain pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a side structural schematic diagram of a falling film evaporator proposed by the utility model;

[0015] Figure 2 A partial structural schematic diagram of a falling film evaporator proposed by the utility model;

[0016] Figure 3 A partial structural schematic diagram of a falling film evaporator proposed by the utility model;

[0017] Figure 4 The utility model is a schematic cross-sectional structure diagram of a falling film evaporator.

[0018] In the figure: 1. Support legs; 2. Reactor; 3. Feed pipe; 4. Air inlet pipe; 5. Air outlet pipe; 6. Condensate pipe; 7. Drain pipe; 8. Discharge pipe; 9. First filter plate; 10. Second filter plate; 11. Cone; 12. First receiving plate; 13. Preheating pipe; 14. Second receiving plate. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] Reference Figure 1-4A falling film evaporator comprises a supporting leg 1, one end of the supporting leg 1 is connected to a reaction tank 2, a feeding pipe 3 is arranged in the middle of the top of the reaction tank 2, an air inlet pipe 4 is arranged above the side of the supporting leg 1, an air outlet pipe 5 is arranged at a position above the side of the supporting leg 1 away from the air inlet pipe 4, a condensate pipe 6 is arranged below the side of the supporting leg 1, a drain pipe 7 is arranged at a position below the side of the supporting leg 1 away from the condensate pipe 6, a discharge pipe 8 is arranged in the middle of the bottom end of the reaction tank 2, a first filter plate 9 is welded to the top of the reaction tank 2, a second filter plate 10 is welded to the top of the reaction tank 2 and located above the first filter plate 9, and a cone 11 is connected to the middle of the top of the second filter plate 10 The connection ports of the feed pipe 3, the air inlet pipe 4, the air outlet pipe 5, the condensed water pipe 6, the drain pipe 7 and the discharge pipe 8 are all provided with electric valves. A first receiving plate 12 is welded at the lower part of the interior of the reaction tank 2, and a hole is opened at the top of the first receiving plate 12. A preheating tube 13 is sleeved in the hole at the top of the first receiving plate 12. A second receiving plate 14 is sleeved on the upper part of the interior of the reaction tank 2, and a hole is opened at the top of the second receiving plate 14. The second receiving plate 14 is located in the hole and sleeved with the preheating tube 13. The top end of the reaction tank 2 is an arc surface, and the bottom end of the reaction tank 2 is an arc surface. A leakage hole is opened at the top of the first filter plate 9, and a leakage hole is opened at the top of the second filter plate 10, so as to achieve the effect of uniform film distribution.

[0021] The use method and advantages of the utility model: When the falling film evaporator is in use, the working process is as follows:

[0022] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, when using the falling film evaporator, firstly, the valve on the feed pipe 3 is opened to inject the feed liquid into the reaction tank 2. At this time, the feed liquid is prevented from directly impacting the second filter plate 10 under the action of the cone 11, thereby causing uneven diversion. At this time, the feed liquid will produce foam during the impact process. The leakage holes on the surface of the second filter plate 10 will directly enter the top of the first filter plate 9, and then evenly divert the feed liquid through the leakage holes on the first filter plate 9 into the preheating tube 13. At this time, the foam on the second filter plate 10 can be isolated above the second filter plate 10 under the obstruction of the water flow, and then the valve on the air inlet pipe 4 is opened. At this time, the high temperature is evenly distributed outside the preheating tube 13, so that the uniformly distributed liquid in the preheating tube 13 can be heated, and the heated raw liquid is discharged through the discharge pipe 8, and the internal high-temperature gas is discharged through the outlet pipe 5. The internal condensate is discharged through the condensate pipe 6 and the drain pipe 7.

[0023] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A falling film evaporator, comprising a support leg (1), characterized in that: One end of the support leg (1) is connected to a reaction tank (2), a feed pipe (3) is arranged in the middle of the top of the reaction tank (2), an air inlet pipe (4) is arranged above the side of the support leg (1), an air outlet pipe (5) is arranged above the side of the support leg (1) at a position away from the air inlet pipe (4), a condensate pipe (6) is arranged below the side of the support leg (1), a drain pipe (7) is arranged below the side of the support leg (1) at a position away from the condensate pipe (6), a discharge pipe (8) is arranged in the middle of the bottom end of the reaction tank (2), a first filter plate (9) is welded to the top of the interior of the reaction tank (2), a second filter plate (10) is welded to the top of the interior of the reaction tank (2) and located above the first filter plate (9), and a cone (11) is connected to the middle of the top of the second filter plate (10).

2. A falling film evaporator according to claim 1, characterized in that: The connection ports of the feed pipe (3), the air inlet pipe (4), the air outlet pipe (5), the condensed water pipe (6), the drain pipe (7), and the discharge pipe (8) are all provided with electric valves.

3. A falling film evaporator according to claim 2, characterized in that: A first receiving plate (12) is welded to the lower part of the interior of the reaction tank (2), a hole is provided on the top of the first receiving plate (12), and a preheating tube (13) is sleeved on the top of the first receiving plate (12) in the hole.

4. A falling film evaporator according to claim 1, characterized in that: A second receiving plate (14) is sleeved on the upper part of the interior of the reaction tank (2), a hole is opened on the top of the second receiving plate (14), and the second receiving plate (14) is located in the hole and sleeved with the preheating tube (13).

5. A falling film evaporator according to claim 1, characterized in that: The top end of the reaction tank (2) is in the form of a curved surface, and the bottom end of the reaction tank (2) is in the form of a curved surface.

6. A falling film evaporator according to claim 1, characterized in that: A leakage hole is provided on the top of the first filter plate (9), and a leakage hole is provided on the top of the second filter plate (10).

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