Novel efficient anti-blocking falling film evaporator

Abstract

The utility model relates to the technical field of falling film evaporation and concentration, in particular to a novel efficient anti-blocking falling film evaporator. Comprising an evaporator shell and a heat exchange mechanism, a material channel and a steam channel are arranged on the evaporator shell, the heat exchange mechanism is a heat exchange pipe, the heat exchange pipe is arranged in the evaporator shell, and a spiral angle is preset on the heat exchange pipe. According to the novel efficient anti-blocking falling film evaporator, the heat exchange pipes are efficient heat exchange pipes, the spiral angle structures on the surfaces of the heat exchange pipes enable the flowing direction of a liquid film to be repeatedly changed to cause sufficient heat exchange between the interiors of the liquid film, meanwhile, the thickness of the liquid film is more uniform, and the formed spiral shearing effect can reduce the viscosity of materials; liquid film turbulent flow is generated at a low flow rate, scabbing in the pipe is effectively prevented, the spiral angle on the surface of the pipe can increase the flow distance of the slurry, and the flow heat exchange time is prolonged under the condition that the flow rate is not changed, so that the evaporation concentration efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of falling film evaporation concentration, in particular to a novel high-efficiency anti-blocking high-efficiency falling film evaporator. Background Art

[0002] At present, the evaporator heat exchange tubes for falling film evaporation and concentration of evaporation and concentration materials at home and abroad all use smooth heat exchange tubes. The evaporation and concentration materials go through the tube side and evaporate along the falling film inside the tube under the action of their own gravity; the steam goes through the shell side to heat the materials and evaporate the moisture in the materials to achieve the purpose of material concentration and purification. This design has the following defects:

[0003] 1. The heat transfer coefficient of traditional smooth heat exchange tubes is low. In order to ensure the evaporation efficiency of materials, the evaporator is designed with a large area and high investment;

[0004] 2. During the evaporation of liquid materials, the evaporator is prone to scaling, salt accumulation and scarring due to overheating and other reasons, which makes the heat exchange deteriorate sharply and leads to a serious reduction in heat exchange efficiency; due to scaling on the wall of the heat exchange tube, it needs to be cleaned regularly, and redundant standby equipment needs to be set up in most occasions. The device needs to be stopped repeatedly, and the continuous operation rate is low

[0005] 3. In order to improve heat exchange efficiency, save heating steam consumption, and make full use of secondary steam, multi-stage evaporators are generally connected in series, but the equipment investment cost and operating cost are high.

[0006] Therefore, how to provide a new type of high-efficiency falling film evaporator with high efficiency and anti-blocking has become a technical problem to be solved by those skilled in the art. Utility Model Content

[0007] The technical problem to be solved by the utility model is how to provide a novel high-efficiency anti-blocking high-efficiency falling film evaporator.

[0008] To achieve the above-mentioned purpose, the utility model provides a novel high-efficiency anti-blocking high-efficiency falling film evaporator, comprising: an evaporator shell and a heat exchange mechanism, the evaporator shell is provided with a material channel and a steam channel, the heat exchange mechanism is a heat exchange tube, the heat exchange tube is arranged inside the evaporator shell, and the heat exchange tube has a preset helical angle.

[0009] The evaporator shell adopts the existing structure on the market in this field, so it will not be repeated here. The material channel forms the tube side for the circulation of materials, and the steam channel forms the shell side for the circulation of steam. The heat exchange tube is a high-efficiency heat exchange tube. The spiral angle structure on its surface makes the flow direction of the liquid film change repeatedly, resulting in sufficient heat exchange between the liquid film. At the same time, the thickness of the liquid film is more uniform, and the spiral shearing effect can reduce the viscosity of the material, causing turbulent flow of the liquid film at low flow rate, effectively preventing the formation of scars in the tube, and the spiral angle on the surface of the pipe can increase the flow distance of the slurry. When the flow rate remains unchanged, the flow heat exchange time is increased, making the evaporation concentration efficiency higher.

[0010] Preferably, a partition plate is installed on the evaporator shell, and more than one partition plate is arranged at equal intervals.

[0011] The partition plate can increase the contact area between the fluid and the heat exchange surface. During the heat exchange process, the larger the contact area between the fluid and the heat exchange surface, the higher the heat exchange efficiency. The partition plate can greatly increase the contact area of ​​the fluid on the heat exchange surface by dividing the fluid into multiple small flow channels, which can improve the heat exchange efficiency and enable the heat exchanger to function better. At the same time, the partition plate can also improve the flow state of the fluid. During the heat exchange process, the flow state of the fluid has an important influence on the heat exchange effect.

[0012] Preferably, the material channel includes a material feeding section and a material discharging section.

[0013] The material feed section and the material discharge section are connected to the evaporator shell through the tube plate, which ensures the stability of the connection. This method is common knowledge in the field and will not be described in detail.

[0014] Preferably, the material feeding section is arranged at the top of the evaporator shell, and a material feeding port is installed at the top of the material feeding section.

[0015] The material enters the material feeding section through the material feeding port.

[0016] Preferably, the material discharge section is arranged at the bottom of the evaporator shell, a material discharge port is installed at the top of the material discharge section, and an evaporating liquid outlet is installed at one side of the material discharge section.

[0017] The concentrated material is discharged from the material outlet, and the evaporating liquid enters the external gas-liquid separator from the evaporating liquid outlet, and the steam is separated by the gas-liquid separator.

[0018] Preferably, the steam channel comprises a steam inlet, a steam outlet and a drain outlet.

[0019] The steam inlet, steam outlet and sewage outlet are fixedly installed on the evaporator shell, ensuring the stability of its fixed connection.

[0020] Preferably, the steam inlet is installed on one side of the outer surface of the evaporator shell.

[0021] Steam enters the evaporator shell from the steam inlet and is used to heat the material in the heat exchange tubes.

[0022] Preferably, the steam outlet is installed on one side of the outer surface of the evaporator shell.

[0023] After the steam heat exchange, the steam-water mixture is discharged from the steam outlet.

[0024] Preferably, the drain outlet is installed on the other side of the outer surface of the evaporator shell.

[0025] The drain port is used to discharge waste materials in the evaporator shell.

[0026] Preferably, a flow distribution structure is installed at one end of the heat exchange tube close to the material feeding section.

[0027] The design of the uniform flow distribution structure allows the material to be evenly distributed on the inner wall of the heat exchange tube, so that the material flows and evaporates along the inner wall of the heat exchange tube under the action of its own gravity.

[0028] The beneficial effects of the utility model are:

[0029] 1. When the utility model is in use, the heat exchange tube is a high-efficiency heat exchange tube. The spiral angle structure on its surface makes the flow direction of the liquid film change repeatedly, resulting in sufficient heat exchange inside the liquid film. At the same time, the thickness of the liquid film is more uniform, and the spiral shearing effect can reduce the viscosity of the material, so that the liquid film turbulent flow occurs at a low flow rate, which effectively prevents the formation of scars in the tube. In addition, the spiral angle on the surface of the pipe can increase the flow distance of the slurry. When the flow rate remains unchanged, the flow heat exchange time is increased, making the evaporation concentration efficiency higher.

[0030] 2. When the utility model is in use, the heat exchange tubes inside the evaporator shell strengthen the evaporation and heat exchange of the material inside the tubes, and at the same time strengthen the condensation of the steam outside the tubes, which is conducive to popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a front view structural schematic diagram of an evaporator shell of a specific embodiment of the utility model;

[0033] Figure 2It is a three-dimensional structural schematic diagram of a heat exchange tube according to a specific implementation method of the utility model.

[0034] Parts Name

[0035] 1. Evaporator shell; 101. Partition partition; 2. Material feed section; 201. Material feed port; 3. Material discharge section; 301. Material discharge port; 302. Evaporating liquid outlet; 4. Steam inlet; 5. Steam outlet; 6. Drain port; 7. Heat exchange tube; 8. Flow distribution structure. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. Preferably, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0038] See also Figure 1 to Figure 2 The utility model provides a novel high-efficiency anti-blocking high-efficiency falling film evaporator, comprising: an evaporator shell 1 and a heat exchange mechanism, the evaporator shell 1 is provided with a material channel and a steam channel, the heat exchange mechanism is a heat exchange tube 7, the heat exchange tube 7 is arranged inside the evaporator shell 1, and the heat exchange tube 7 is preset with a spiral angle, a partition plate 101 is installed on the evaporator shell 1, and more than one partition plate 101 is arranged at equal intervals, the material channel comprises a material feed section 2 and a material discharge section 3, the material feed section 2 is arranged on the top of the evaporator shell 1, and the material feed section 2 A material feed port 201 is installed at the top, a material discharge section 3 is arranged at the bottom of the evaporator shell 1, a material discharge port 301 is installed at the top of the material discharge section 3, and an evaporating liquid outlet 302 is installed on one side of the material discharge section 3, the steam channel includes a steam inlet 4, a steam outlet 5 and a drain port 6, the steam inlet 4 is installed on one side of the outer surface of the evaporator shell 1, the steam outlet 5 is installed on one side of the outer surface of the evaporator shell 1, the drain port 6 is installed on the other side of the outer surface of the evaporator shell 1, and a heat exchange tube 7 is installed with a flow distribution structure 8 at one end close to the material feed section 2;

[0039] In this embodiment:

[0040] First, the material enters the heat exchange tube 7 through the material feed port 201 on the material feed section 2. At the same time, the steam enters the evaporator shell 1 through the steam inlet 4. When the material flows, it is evenly distributed to the inner wall of the heat exchange tube 7 through the flow distribution structure 8, so that the material flows and evaporates along the inner wall of the heat exchange tube 7 under the action of its own gravity, thereby evaporating and concentrating the moisture of the material in the heat exchange tube 7. After the steam heat exchange, the steam-water mixture is discharged from the steam outlet 5.

[0041] Secondly, after evaporation and concentration, the concentrated material is discharged through the material discharge port 301 on the material discharge section 3, and at the same time, the evaporating liquid vapor enters the external gas-liquid separator from the evaporating liquid outlet 302, and the steam is separated by the gas-liquid separator;

[0042] Then, when the evaporator shell 1 is in use, the partition plate 101 divides the fluid into a plurality of small flow paths, so that the contact area of ​​the fluid on the heat exchange surface is greatly increased, which can improve the heat exchange efficiency and enable the heat exchanger to function better;

[0043] Finally, when not in use, the waste material of the evaporator housing 1 is discharged to the outside through the drain port 6.

[0044] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the utility model.

Claims

1. A new type of high-efficiency anti-blocking high-efficiency falling film evaporator, comprising: An evaporator shell (1) and a heat exchange mechanism, wherein the evaporator shell (1) is provided with a material channel and a steam channel, and is characterized in that the heat exchange mechanism is a heat exchange tube (7), the heat exchange tube (7) is arranged inside the evaporator shell (1), and a helical angle is preset on the heat exchange tube (7).

2. The novel high-efficiency anti-blocking high-efficiency falling film evaporator according to claim 1 is characterized in that: The evaporator shell (1) is provided with a partition plate (101), and more than one partition plate (101) is arranged at equal intervals.

3. The novel high-efficiency anti-blocking high-efficiency falling film evaporator according to claim 1 is characterized in that: The material channel comprises a material feeding section (2) and a material discharging section (3).

4. The novel high-efficiency anti-blocking high-efficiency falling film evaporator according to claim 3 is characterized in that: The material feeding section (2) is arranged on the top of the evaporator shell (1), and a material feeding port (201) is installed on the top of the material feeding section (2).

5. The novel high-efficiency anti-blocking high-efficiency falling film evaporator according to claim 3 is characterized in that: The material discharge section (3) is arranged at the bottom of the evaporator shell (1), a material discharge port (301) is installed at the top of the material discharge section (3), and an evaporating liquid outlet (302) is installed at one side of the material discharge section (3).

6. The novel high-efficiency anti-blocking high-efficiency falling film evaporator according to claim 1 is characterized in that: The steam channel comprises a steam inlet (4), a steam outlet (5) and a sewage outlet (6).

7. The novel high-efficiency anti-blocking high-efficiency falling film evaporator according to claim 6 is characterized in that: The steam inlet (4) is installed on one side of the outer surface of the evaporator shell (1).

8. The novel high-efficiency anti-blocking high-efficiency falling film evaporator according to claim 6, characterized in that: The steam outlet (5) is installed on one side of the outer surface of the evaporator shell (1).

9. The novel high-efficiency anti-blocking high-efficiency falling film evaporator according to claim 6, characterized in that: The sewage outlet (6) is installed on the other side of the outer surface of the evaporator shell (1).

10. The novel high-efficiency anti-blocking high-efficiency falling film evaporator according to claim 1, characterized in that: An even flow distribution structure (8) is installed at one end of the heat exchange tube (7) close to the material feeding section (2).

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