CN211651296U - Novel plate-tube type liquefied natural gas heat exchanger - Google Patents

Abstract

The utility model provides a novel plate-and-tube liquefied natural gas heat exchanger, which comprises an outer casing and a plate-and-tube casing, one end of the outer casing is provided with a cold fluid inlet and a hot fluid outlet, and the other end is provided with a cold fluid outlet and a hot fluid inlet; One end of the plate-and-tube shell is provided with an inlet hole on the upper side, and the other end is provided with a discharge hole on the lower side. Several plate-and-tube shells are arranged in parallel, connected in series by short pipes, and installed in the outer shell, and are connected with the cold fluid inlet and the cold fluid outlet; The three sides of the tube shell are sealed with the inner wall of the outer shell, and one side is spaced from the outer shell to form a hot fluid channel; the hot fluid channels formed by the adjacent plate tube shell and the outer shell are staggered; A protruding half-pipe-type flow channel is provided, several half-pipe-type flow channels are connected on the sides, and two ends of the half-pipe-type flow channels are connected with the inlet hole and the discharge hole. The heat exchanger has a simple and reasonable structure, and is easy to repair and maintain; the size of the fluid flow channel is large, the heat exchange area is large, the heat exchange efficiency is high, and the fluid flow speed is fast, which can effectively improve the production efficiency.

Description

A new type of plate and tube heat exchanger for liquefied natural gas

technical field

The utility model relates to the technical field of heat exchangers, in particular to a novel plate-and-tube type heat exchanger for liquefied natural gas.

Background technique

In the production process of liquefied natural gas (LNG), the gasification process of natural gas requires the use of heat exchange equipment. At present, common heat exchangers can be divided into indirect heat transfer energy storage heat exchangers and direct heat transfer plate and tube heat exchangers. type heat exchanger. Among them, plate-fin heat exchangers and threaded tube heat exchangers are mostly used in the production process of liquefied natural gas. The plate-fin heat exchanger has high heat transfer efficiency and strong adaptability, and can be applied to heat exchange between various fluids; the threaded tube heat exchanger has high heat transfer efficiency and compact structure. However, both of these two heat exchangers have the problems of complex structure, difficult disassembly, and difficult maintenance. In addition, in order to achieve higher heat exchange efficiency, these two heat exchangers have smaller size of the fluid flowing through the channel, which will reduce the flow velocity. Therefore, although these two heat exchangers have high heat exchange efficiency , but the production speed is slower.

Utility model content

The purpose of the utility model is to provide a novel plate-and-tube type LNG heat exchanger, which has a simple and reasonable structure, and is easy to repair and maintain; the size of the fluid flow channel is large, the heat exchange area is large, the heat exchange efficiency is high, and the fluid flow Fast, can effectively improve production efficiency.

For achieving the above object, the technical scheme adopted by the present utility model is as follows:

A new type of plate-and-tube liquefied natural gas heat exchanger, comprising a sealed outer shell and several plate-and-tube shells, one end of the outer shell is provided with a cold fluid inlet and a hot fluid outlet, and the other end is provided with a cold fluid outlet and a hot fluid Inlet; the upper side of one end of the plate and tube shell is provided with an inlet hole, and the lower side of the other end is provided with a discharge hole, a plurality of the plate-and-tube shells are arranged in parallel, and are sequentially connected in series through the short pipes to be installed in the outer shell, and Connected with the cold fluid inlet and the cold fluid outlet; the three sides of the plate-and-tube shell are detachably sealed with the inner wall of the outer shell, and one side is spaced from the outer shell to form a hot fluid channel; adjacent plate-and-tube shells The hot fluid channels formed by the shell and the outer shell are arranged alternately; the upper and lower parts of the plate-tube shell are provided with a number of protruding half-pipe-type flow channels, and the sides of the several half-pipe-type flow channels are connected, and the two ends of the half-pipe flow channels are connected. The part communicates with the inlet hole and the outlet hole.

Further, it also includes a fixed connection column, the fixed connection column is passed through the ends of the plate tube shells arranged at intervals, and is connected with both ends of the outer shell. The fixed connection column is arranged to make the structure of the heat exchange component assembled by the plate-tube shell and the short tube more stable and firm.

Further, the upper and lower half-pipe flow channels of the plate-and-tube shell are evenly distributed, and are arranged corresponding to or staggered from each other. Different heat exchange surfaces are formed to achieve different heat exchange efficiencies.

Further, the half-pipe flow channels are linear or curved flow channels that are parallel to each other. The curved runner can extend the length of the half-pipe runner and increase the heat exchange area.

Further, one end of the short pipe is connected with the discharge hole by brazing, and the other end is connected with the inlet hole by brazing.

Further, both the cold fluid inlet and the short pipe are provided with anti-return structures. Prevent fluid backflow and ensure the normal operation of the heat exchanger.

Further, baffle blocks are arranged in the plate-tube shell, and the baffle blocks are arranged in the half-pipe-type flow channel at intervals. The baffle blocks play the role of changing the flow direction of the fluid, which is convenient for the fluids in the plate and tube shell to impact each other and mix evenly, so that the gas and liquid are mixed evenly, and the phenomenon of dry steaming is prevented.

Further, a dispersing piece is provided at the entry hole, and the dispersing piece is arranged obliquely toward the end of the plate-and-tube shell where the entry hole is arranged. It is convenient for the fluid to gather at the end when it enters the plate and tube shell, and then evenly disperse and flow through the plate and tube shell.

Further, a protruding annular compensating ring is provided on the outer casing, and the compensating ring is close to the outlet end of the cold fluid. The compensation ring can store a certain amount of hot fluid. When the amount of hot fluid in the hot fluid flow channel is insufficient, it can be supplemented to ensure that the cold fluid is fully heated and discharged.

Further, the plate tube shell and the short tube are made of aluminum material. Aluminum material heat transfer speed block, high thermal conductivity.

Compared with the prior art, the beneficial effects of the present utility model are:

In the heat exchanger of the utility model, the main heat exchange component is a plate-and-tube shell, the plate-and-tube shells are arranged in parallel in the outer shell, and are connected in series through short tubes to form a fluid flow channel to be heated; the plate-and-tube shell and the outer shell are The inner wall of the plate and tube forms mutually staggered hot fluid channels, which prolongs the path of heat exchange; the protruding half-tube flow channel is set on the plate and tube shell to increase the outer surface area of the plate and tube shell, that is, to increase the heat exchange area and ensure The two-phase fluid is fully contacted for heat exchange, and the heat transfer efficiency is high. The side of the half-pipe flow channel of the plate-and-tube shell is connected, that is, the inside of the plate-tube shell is a connected cavity, which facilitates the smooth flow of the fluid, ensures the fluid speed and production efficiency, and at the same time prevents clogging and avoids less fluid in the small flow channel. Dry steam occurs. The heat exchange parts of the heat exchanger are assembled with a plate and tube shell and a short tube, and have a simple structure, which is convenient for disassembly, installation, replacement and maintenance.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of the overall structure of the heat exchanger of the present invention.

FIG. 2 is a schematic structural diagram of part A in FIG. 1 of the present utility model.

FIG. 3 is a schematic top-view structural diagram of a plate-and-tube shell of a linear half-tube flow channel.

FIG. 4 is a schematic top-view structural diagram of a plate-and-tube shell of a curved half-tube flow channel.

FIG. 5 is a schematic top-view structural diagram of a plate-and-tube shell provided with baffles.

FIG. 6 is a schematic cross-sectional structural diagram of the middle part of the plate-and-tube shell of the upper and lower corresponding linear half-tube flow channels.

FIG. 7 is a schematic cross-sectional structural diagram of the middle part of the plate-and-tube shell of the linear half-tube flow channel arranged staggered up and down.

Reference number:

1: Outer shell; 11: Cold fluid inlet; 12: Cold fluid outlet; 13: Hot fluid inlet; 14: Hot fluid outlet; 15: Compensation ring; 16: Hot fluid channel; 2: Plate and tube shell; 21: Inlet hole; 22: discharge hole; 23: half-pipe flow channel; 24: baffle; 25: dispersion piece; 3: short pipe; 4: fixed connection column.

Detailed ways

The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

The embodiment of the present utility model provides a novel plate-and-tube LNG heat exchanger, which includes an outer casing 1 and a plurality of plate-and-tube casings 2 arranged in the outer casing 1 .

As shown in FIG. 1 and FIG. 2 , the outer casing 1 is a detachable sealed casing, which can withstand a certain pressure after being installed. One end of the outer casing 1 is provided with a cold fluid inlet 11 and a hot fluid inlet 14 , and the other end is provided with a cold fluid outlet 12 and a hot fluid inlet 13 . The cold fluid inlet 11 and the cold fluid outlet 12 communicate with the inner cavity of the plate-and-tube shell 2 to form a cold fluid channel; the hot fluid inlet 13 and the hot fluid outlet 14 communicate with the inner cavity of the outer shell 1 to form a hot fluid channel. The tube housing 2 is immersed in the hot fluid channel.

As shown in FIG. 1 to FIG. 3 , the plate-tube casing 2 is a flat sealed casing, and has a rectangular or elliptical structure when viewed from above. The upper side of one end of the plate-and-tube shell 2 is provided with an inlet hole 21 , and the lower side of the other end is provided with a discharge hole 22 . A plurality of plate and tube shells 2 are arranged in parallel in the outer shell 1, connected in series through the short pipes 3, and connected with the cold fluid inlet 11 of one section of the outer shell 1 and the cold fluid outlet 12 of the other end of the outer shell 1. That is, the cold fluid inlet 11 is connected to the inlet hole 21 of the plate and tube shell 2, the discharge hole 22 of the plate and tube shell 2 is connected to the inlet hole 21 of the second plate and tube shell 2 through the short pipe 3, and the second plate tube The discharge hole 22 of the shell 2 is then connected to the inlet hole 21 of the next plate and tube shell 2 through the short pipe 3, which is connected in series in sequence, and finally the discharge hole 22 of the plate and tube shell 2 is connected to the cold fluid outlet 12 of the outer shell 1, A complete cold fluid channel is formed. The plate-and-tube shell 2 is connected by a short tube 3 to form a heat exchange core of the heat exchanger, wherein the plate-and-tube shell 2 and the short tube 3 should be made of materials with strong thermal conductivity, preferably aluminum or aluminum alloy materials, It can ensure that the heat exchanger has high heat exchange efficiency.

The dimensions of the plate-and-tube housing 2 are adapted to the internal dimensions of the outer housing 1 . The three sides of the plate-and-tube shell 2 are connected with the inner wall of the outer shell 1 in a detachable and sealed connection; the other side is separated from the inner wall of the outer shell 1 by a certain distance, forming a hot fluid channel 16 for the circulation of the heating fluid. The positions of the inlet holes 21 and the discharge holes 22 of the adjacent plate-and-tube shells 2 are reversed, and the plate-and-tube shells 2 and the hot fluid channels 16 formed by the inner wall of the outer shell 1 are arranged alternately. The hot fluid channel 16 includes the space between the adjacent plate-and-tube shells 2 and the space between the plate-and-tube shell 2 and the inner wall of the outer shell 1; The upper and lower surfaces ensure that the heat exchange is fully and evenly carried out.

As shown in FIGS. 3 to 7 , the upper and lower parts of the plate-and-tube housing 2 are provided with a number of protruding half-tube flow channels 23 . The cavity is connected as a whole. The half-pipe flow channel 23 extends from the end of the inlet hole 21 to the end of the outlet hole 22 , and communicates with the inlet hole 21 and the outlet hole 22 . The provision of the protruding half-pipe flow channel 23 effectively increases the surface area of the plate-and-tube shell 2, that is, the heat exchange area is increased, and the heat exchange efficiency can be improved.

The upper and lower half-pipe flow channels 23 of the plate-and-tube shell 2 are evenly distributed at equal distances, and the upper and lower plate-tube flow channels 23 can be arranged correspondingly or staggered from each other.

Several half-pipe-type flow channels 23 on the plate-and-tube shell 2 are distributed parallel to each other, and can be linear or curvilinear. The straight half-pipe flow channel 23 has smooth fluid circulation, which can reduce the passage time of the fluid; the curved plate-tube flow channel 23 can effectively extend the length of the flow channel, increase the heat exchange area and heat exchange time, and ensure that the inside of the plate and tube shell 2 the fluid is fully heated. Different half-pipe runner 23 structures can be selected according to production needs to achieve better production results.

As shown in FIG. 1 , the heat exchanger is provided with a fixed connection column 4 , which is penetrated at the end of the plate-and-tube shells 2 arranged at intervals, and is perpendicular to the plate-and-tube shell 2 . The ends are connected to both ends inside the outer casing 1 . There are preferably four fixed connection posts 4 , which are inserted through the four corners of the plate-and-tube shell 2 to strengthen and stabilize, so that the connection structure between the plate-and-tube shell 2 and the short tube 3 is more stable.

One end of the short pipe 3 is connected to the discharge hole 22 of the plate-and-tube shell 2, and the other end is connected to the inlet hole 21 of the other plate-and-tube shell 2. The connection method is a sealed connection, preferably a brazing connection.

A preferred embodiment is that both the cold fluid inlet 11 of the heat exchanger and the short pipe 3 connecting the plate-and-tube shell 2 are provided with a non-return structure, and the non-return structure can be a non-return valve to prevent the backflow of fluid. to ensure the normal and efficient operation of the heat exchanger.

Further, several baffle blocks 24 are also arranged in the plate-and-tube shell 2, and several baffle blocks 24 are installed in the half-pipe-type flow channel 23 at intervals to change the flow direction of the fluid, so as to facilitate the The fluid is evenly mixed and evenly dispersed to flow through the inside of the plate and tube shell 2 . When liquefied natural gas is gasified, the natural gas in the gas phase and the liquid phase can be mixed to prevent local evaporation.

Preferably, a dispersing member 25 is provided at the entrance hole 21 of the plate-and-tube shell 2 , and the dispersing member 25 may be an inclined sheet-like structure whose inclination direction is inclined toward the end of the plate-and-tube shell 2 where the entry hole 21 is provided. The incoming fluid can be dispersed to the end of the plate-and-tube shell 2, and then flow in the reverse direction into the plate-and-tube shell 2, which plays a dispersing role and prevents uneven distribution of the fluid when it enters the plate-and-tube shell 2.

Further, the outer casing 1 is preferably provided with a ring of protruding annular compensation ring 15, the compensation ring 15 surrounds the outer casing 1 for a circle, communicates with the hot fluid flow channel 16, and can accommodate a certain amount of hot fluid. The compensation ring 15 and the outer casing 1 are arranged near the end of the cold fluid outlet 12. When the amount of hot fluid in the hot fluid flow channel 16 is insufficient, a certain supplement can be given to ensure that the cold fluid is fully heated and discharged.

In the foregoing, only certain exemplary embodiments have been described briefly. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not restrictive.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" ”, “radial”, “circumferential”, etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that is usually placed when the product of the present utility model is used, or the Orientation or positional relationships that are commonly understood by those skilled in the art are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be. It is understood as a limitation of the present invention.

In the present utility model, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integration; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two elements or the interaction of two elements relation. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Claims (10)

1. The novel plate-tube type heat exchanger for liquefied natural gas is characterized by comprising a sealed outer shell (1) and a plurality of plate-tube shells (2), wherein one end of the outer shell (1) is provided with a cold fluid inlet (11) and a hot fluid outlet (14), and the other end of the outer shell is provided with a cold fluid outlet (12) and a hot fluid inlet (13); an inlet hole (21) is formed in the upper side of one end of each plate pipe shell (2), a discharge hole (22) is formed in the lower side of the other end of each plate pipe shell, a plurality of plate pipe shells (2) are arranged in parallel, are sequentially connected in series through short pipes (3) and are installed in the outer shell (1), and are connected with the cold fluid inlet (11) and the cold fluid outlet (12); three side surfaces of the plate-tube shell (2) are detachably and hermetically connected with the inner wall of the outer shell (1), and one side surface and the outer shell (1) are separated to form a hot fluid channel (16); hot fluid channels (16) formed by the adjacent plate pipe shells (2) and the outer shell (1) are arranged in a staggered manner; the upper part and the lower part of the plate-tube shell (2) are respectively provided with a plurality of protruding half-tube type flow passages (23), the side surfaces of the half-tube type flow passages (23) are communicated, and the two end parts of the half-tube type flow passages are communicated with the inlet hole (21) and the outlet hole (22).

2. The novel plate-tube type liquefied natural gas heat exchanger according to claim 1, further comprising a fixed connection column (4), wherein the fixed connection column (4) is inserted into the ends of the plate-tube shells (2) arranged at intervals and connected with the two ends of the outer shell (1).

3. The new plate and tube type lng heat exchanger according to claim 1 or 2, wherein the half-tube flow passages (23) in the upper and lower parts of the plate and tube shell (2) are uniformly distributed and are arranged corresponding to or staggered from each other.

4. The new plate and tube liquefied natural gas heat exchanger according to claim 3, wherein the half-tube flow passages (23) are straight or curved flow passages parallel to each other.

5. The new tube-in-sheet heat exchanger for liquefied natural gas according to claim 1, wherein the short tube (3) is brazed at one end to the exhaust port (22) and at the other end to the intake port (21).

6. The new plate and tube liquefied natural gas heat exchanger according to claim 5, characterized in that a non-return structure is provided in both the cold fluid inlet (11) and the short tube (3).

7. The novel plate-tube type liquefied natural gas heat exchanger according to claim 1, wherein a baffling block (24) is arranged in the plate-tube shell (2), and the baffling block (24) is arranged in the half-tube type flow passage (23) at intervals.

8. The new plate and tube liquefied natural gas heat exchanger according to claim 1, wherein a dispersion member (25) is provided at the inlet hole (21), and the dispersion member (25) is disposed to be inclined toward the end of the plate and tube shell (2) where the inlet hole (21) is provided.

9. The new plate and tube liquefied natural gas heat exchanger according to claim 1, characterized in that the outer shell (1) is provided with a raised annular compensating ring (15), and the compensating ring (15) is close to the cold fluid outlet (12) end.

10. The new plate and tube liquefied natural gas heat exchanger according to claim 1, wherein the plate and tube shell (2) and the short tube (3) are made of aluminum material.

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