Internal siphon type short-range evaporator

Abstract

The utility model discloses an internal siphon type short-range evaporator, which relates to the technical field of evaporators, and comprises a gas-liquid separation part, a liquefaction evaporation part and a liquid sinking part, the top wall of the gas-liquid separation part is provided with a gas outlet, the lower part of the side wall of the gas-liquid separation part is provided with a liquid material inlet, and the outside of the liquefaction evaporation part is provided with a heating medium inlet and a heating medium outlet. A central downcomer is vertically arranged on the inner central shaft, and a plurality of short-distance heat exchange tubes are distributed on the periphery of the central downcomer. According to the utility model, the short-distance heat exchange tubes are adopted, so that under the same heat exchange area, the number of the short-distance heat exchange tubes is large, the cross sectional area is increased, the heat transfer distance is reduced, the heat transfer area is increased, faster heat transfer is realized, the liquid / gas flow rate is lower, and the entrained liquid amount is reduced; a small amount of liquid entrained by the steam flows into the liquid sinking part from the central downcomer after being separated by the gas-liquid separation part, and is evaporated again, so that the problem of gas-liquid entrainment of a common tubular evaporator is thoroughly solved.

Description

Technical Field

[0001] This utility model relates to the field of evaporator technology, specifically to an internal siphon type short-path evaporator. Background Technology

[0002] Evaporators are a key piece of equipment in chemical processes. They are a type of heat exchanger that exchanges cold and hot energy. Low-temperature liquid materials pass through the evaporator and exchange heat with low-pressure steam on the high-temperature side, causing them to absorb heat and vaporize, thus achieving the desired effect. They are widely used in chemical and other fields.

[0003] Most current evaporators adopt a shell-and-tube heat exchange structure. For example, patent CN200820034880.4 describes an evaporator that includes evaporation tubes and fins. The evaporation tubes are U-shaped, with straight tubes at both ends inserted into the insertion holes. However, when the evaporation rate of a conventional evaporator increases, the secondary steam rises faster, resulting in severe liquid entrainment. Therefore, a gas-liquid separator must be installed after the evaporator to provide a separation site for the material and secondary steam, which increases equipment investment and floor space. Utility Model Content

[0004] The purpose of this invention is to provide an internal siphon short-path evaporator to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an internal siphon-type short-range evaporator, comprising: a gas-liquid separation section, a liquefaction evaporation section, and a liquid settling section arranged sequentially from top to bottom; the gas-liquid separation section is sealed to the liquefaction evaporation section, and the liquefaction evaporation section is sealed to the liquid settling section; the top wall of the gas-liquid separation section has a gas outlet, and the lower part of the side wall has a liquid material inlet; the upper part of the side wall of the liquefaction evaporation section has a heating medium inlet, and the lower part of the side wall has a heating medium outlet; the middle part of the side wall has two symmetrical fixed lugs; the upper end of the liquefaction evaporation section has a first tube sheet, and the lower end has a second tube sheet; the first and second tube sheets are sealed to the inner wall of the liquefaction evaporation section; a central downcomer is vertically arranged at the center line of the liquefaction evaporation section; multiple short-range heat exchange tubes are distributed between the central downcomer and the inner wall of the liquefaction evaporation section; and the bottom wall of the liquid settling section has a liquid material outlet.

[0006] Furthermore, the short-path heat exchange tubes are vertically distributed between the central downcomer and the inner wall of the liquefaction evaporation section, and the short-path heat exchange tubes are closely arranged together.

[0007] Furthermore, both the first tube sheet and the second tube sheet are provided with coaxial downcomer holes. A central downcomer passes through the downcomer holes. The upper end of the central downcomer passes through the downcomer hole of the first tube sheet and is flush with the upper horizontal plane of the first tube sheet. The lower end passes through the downcomer hole of the second tube sheet and enters the liquid sinking part. The central downcomer is sealed to the first tube sheet and the second tube sheet.

[0008] Furthermore, both the first tube sheet and the second tube sheet are provided with coaxial heat exchange tube holes, through which short-path heat exchange tubes pass. The upper end of the short-path heat exchange tube passes through the heat exchange tube hole of the first tube sheet and enters the gas-liquid separation section, and the lower end passes through the heat exchange tube hole of the second tube sheet and enters the liquid settling section. The short-path heat exchange tube is sealed to the first tube sheet and the second tube sheet.

[0009] Preferably, the liquefaction evaporation section is provided with multiple baffles, which are arranged in an alternating pattern.

[0010] Preferably, the baffle plate is provided with holes for the central downcomer and the short-path heat exchanger to pass through, and the central downcomer and the short-path heat exchanger are fixed in the liquefaction evaporation section through the holes.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model uses short-path heat exchange tubes, which require more tubes for the same heat exchange area, increasing the cross-sectional area, reducing the heat transfer distance and increasing the heat transfer area, thus achieving faster heat transfer. The liquid / gas flow rate is lower, reducing the amount of entrained liquid. A larger downcomer is set in the center of the liquefaction evaporation section, so that the small amount of liquid entrained by the steam flows into the liquid sink section from the central downcomer after being separated in the gas-liquid separation section, and then evaporates again, completely solving the gas-liquid entrainment problem of general shell and tube evaporators. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a partial cross-sectional view of the present invention;

[0014] Figure 3 This is a plan view of the first tube sheet of this utility model;

[0015] Figure 4 This is a schematic diagram of the baffle structure of this utility model;

[0016] In the diagram: 1. Gas-liquid separation section, 2. Liquefaction and evaporation section, 3. Liquid settling section, 4. Gas outlet, 5. Liquid material inlet, 6. Heating medium inlet, 7. Heating medium outlet, 8. Fixed support lug, 9. First tube sheet, 10. Second tube sheet, 11. Central downcomer, 12. Short-path heat exchange tube, 13. Liquid material outlet, 14. Baffle plate, 15. Downcomer hole, 16. Heat exchange tube hole. Detailed Implementation

[0017] The present invention will now be described with reference to the accompanying drawings of the embodiments. However, it is worth noting that the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. However, for the parts that are not described in detail, those skilled in the art can fully understand the present invention.

[0018] Furthermore, those skilled in the art should understand that the accompanying drawings are provided only to illustrate the purpose, features, and advantages of this utility model, and are not actually drawn to scale.

[0019] Furthermore, unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to."

[0020] Please see Figures 1-4 This utility model provides a technical solution comprising, from top to bottom, a gas-liquid separation section 1, a liquefaction evaporation section 2, and a liquid sinking section 3. The gas-liquid separation section 1 is sealed to the liquefaction evaporation section 2, and the liquefaction evaporation section 2 is sealed to the liquid sinking section 3. The top wall of the gas-liquid separation section 1 has a gas outlet 4, and the lower part of the side wall has a liquid material inlet 5. The upper part of the side wall of the liquefaction evaporation section 2 has a heating medium inlet 6, and the lower part of the side wall has a heating medium outlet 7. The middle part of the side wall has two symmetrical fixed lugs 8. The upper end of the liquefaction evaporation section 2 has a first tube plate 9, and the lower end has a second tube plate 10. The first tube plate 9 and the second tube plate 10 are sealed to the inner wall of the liquefaction evaporation section 2. A central downcomer 11 is vertically arranged at the center line of the liquefaction evaporation section 2. Multiple short-path heat exchange tubes 12 are distributed between the central downcomer 11 and the inner wall of the liquefaction evaporation section 2. The bottom wall of the liquid sinking section 3 has a liquid material outlet 13.

[0021] The short-range heat exchange tubes 12 are vertically distributed between the central downcomer 11 and the inner wall of the liquefaction evaporation section 2, and the short-range heat exchange tubes 12 are closely arranged together.

[0022] Both the first tube sheet 9 and the second tube sheet 10 are provided with coaxial downcomer holes 15. A central downcomer 11 passes through the downcomer hole 15. The upper end of the central downcomer 11 passes through the downcomer hole 15 of the first tube sheet 9 and is flush with the upper horizontal plane of the first tube sheet. The lower end passes through the downcomer hole 15 of the second tube sheet 10 and enters the liquid sinking part 3. The central downcomer 11 is sealed to the first tube sheet 9 and the second tube sheet 10.

[0023] Both the first tube sheet 9 and the second tube sheet 10 are provided with coaxial heat exchange tube holes 16. A short-path heat exchange tube 12 passes through the heat exchange tube hole 16. The upper end of the short-path heat exchange tube 12 passes through the heat exchange tube hole 16 of the first tube sheet 9 and enters the gas-liquid separation section 1, and the lower end passes through the heat exchange tube hole 16 of the second tube sheet 10 and enters the liquid sinking section 3. The short-path heat exchange tube 12 is sealed to the first tube sheet 9 and the second tube sheet 10.

[0024] The liquefaction evaporation section 2 is provided with multiple baffles 14, which are arranged in an alternating pattern.

[0025] The baffle plate 14 is provided with holes through which the central downcomer 11 and the short-distance heat exchanger 12 pass. The central downcomer 11 and the short-distance heat exchanger 12 pass through the holes and are fixed inside the liquefaction evaporation section 2.

[0026] When using this utility model, the heating medium first enters the liquid evaporation section 2 through the heating medium inlet 7 and flows out from the heating medium outlet to form a heating cycle. Then, the liquid material enters the gas-liquid separation section 1 through the liquid material inlet 5 and flows into the liquid sinking section 3 through the central downcomer 11. During this process, heat is exchanged with the heating medium, the liquid material is partially vaporized, and the gas rises through the heat exchange tube to form a continuous natural circulation. The inlet and outlet liquids generate a density difference (potential energy difference). This pressure difference generates power, which increases the mass flow rate and circulation rate of the low-temperature liquid in the tube. The upper end of the central downcomer 11 passes through the downcomer hole 15 of the first tube sheet 9 and is flush with the upper horizontal plane of the first tube sheet, so that the liquid material flows into the central downcomer better. The liquid evaporation section 2 adopts the form of short-range heat exchange tubes 12. Under the same heat exchange area, more short-range heat exchange tubes 12 are used, and the cross-sectional area is larger than that of conventional shell and tube heat exchangers. This reduces the heat transfer distance and increases the heat transfer area, achieving faster heat transfer. The liquid / gas flow rate is lower, and the entrained liquid volume is reduced. A central downcomer 11 with a larger size is set in the axial center inside the evaporator. The small amount of liquid entrained by the steam is separated in the gas-liquid separation section 1 and flows from the central downcomer 11 into the liquid sink section 1 for re-evaporation, completely solving the gas-liquid entrainment problem of general shell and tube evaporators.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An internal siphon type short-path evaporator, characterized in that, include: The gas-liquid separation section (1), liquefaction evaporation section (2), and liquid settling section (3) are arranged sequentially from top to bottom. The gas-liquid separation section (1) is sealed to the liquefaction evaporation section (2), and the liquefaction evaporation section (2) is sealed to the liquid settling section (3). The top wall of the gas-liquid separation section (1) is provided with a gas outlet (4), and the lower part of the side wall is provided with a liquid material inlet (5). The upper part of the side wall of the liquefaction evaporation section (2) is provided with a heating medium inlet (6), the lower part of the side wall is provided with a heating medium outlet (7), and the middle part of the side wall is provided with two A symmetrical fixed support (8) is provided. The upper end of the liquefaction evaporation section (2) is provided with a first tube plate (9) and the lower end is provided with a second tube plate (10). The first tube plate (9) and the second tube plate (10) are sealed to the inner wall of the liquefaction evaporation section (2). A central downcomer (11) is vertically provided at the center line of the liquefaction evaporation section (2). Multiple short-path heat exchange tubes (12) are distributed between the central downcomer (11) and the inner wall of the liquefaction evaporation section (2). The bottom wall of the liquid sinking section (3) is provided with a liquid material outlet (13).

2. The internal siphon short-path evaporator according to claim 1, characterized in that, The short-range heat exchange tubes (12) are vertically distributed between the central downcomer (11) and the inner wall of the liquefaction evaporation section (2), and the short-range heat exchange tubes (12) are closely arranged together.

3. The internal siphon short-path evaporator according to claim 2, characterized in that, Both the first tube sheet (9) and the second tube sheet (10) are provided with coaxial downcomer holes (15). A central downcomer (11) passes through the downcomer hole (15). The upper end of the central downcomer (11) passes through the downcomer hole (15) of the first tube sheet (9) and is flush with the upper horizontal plane of the first tube sheet. The lower end passes through the downcomer hole (15) of the second tube sheet (10) and enters the liquid sinking part (3). The central downcomer (11) is sealed to the first tube sheet (9) and the second tube sheet (10).

4. The internal siphon short-path evaporator according to claim 3, characterized in that, Both the first tube sheet (9) and the second tube sheet (10) are provided with coaxial heat exchange tube holes (16). A short-range heat exchange tube (12) passes through the heat exchange tube hole (16). The upper end of the short-range heat exchange tube (12) passes through the heat exchange tube hole (16) of the first tube sheet (9) and enters the gas-liquid separation section (1), and the lower end passes through the heat exchange tube hole (16) of the second tube sheet (10) and enters the liquid sinking section (3). The short-range heat exchange tube (12) is sealed to the first tube sheet (9) and the second tube sheet (10).

5. The internal siphon short-path evaporator according to claim 1, characterized in that, The liquefaction evaporation section (2) is provided with multiple baffles (14) arranged in an alternating pattern.

6. The internal siphon short-path evaporator according to claim 5, characterized in that, The baffle plate (14) is provided with holes through which the central downcomer (11) and the short-range heat exchanger (12) pass. The central downcomer (11) and the short-range heat exchanger (12) pass through the holes and are fixed in the liquefaction evaporation section (2).

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