Shell-and-tube heat exchanger

Abstract

The utility model discloses a shell-and-tube heat exchanger, which belongs to the technical field of heat exchangers, and comprises a shell, a heat exchange tube, a first tube plate, a second tube plate, a first seal head and a second seal head, the shell is connected with a first inlet tube and a first outlet tube, the first seal head is connected with a second inlet tube, and the second seal head is connected with a second outlet tube. A first partition plate is arranged in the first end socket, a second partition plate is arranged in the second end socket, and a first isolating valve is arranged on the first partition plate. The tube pass of the heat exchanger is divided into two parts, two different media can be connected into the heat exchange tube, and therefore the heat exchanger can utilize the same medium to conduct heat exchange on the other two different media at the same time. The flow speed in the pipe can be increased by independently utilizing the heat exchange pipe of the upper half part or the lower half part to work, the pipe is washed without shutdown, and blockage in the pipe is reduced; a path of medium into and out of the heat exchanger may be controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and in particular relates to a shell and tube heat exchanger. Background Art

[0002] Shell and tube heat exchangers are also called tube-in-tube heat exchangers. When exchanging heat, one fluid medium enters from the connecting pipe of the head, flows in the heat exchange tube, and flows out from the outlet pipe at the other end of the head. This is called the tube side; another fluid medium enters from the connecting pipe of the shell and flows out from another connecting pipe on the shell. This is called the shell side. Due to its simple structure and easy maintenance, it is widely used and used in large quantities in chemical, petrochemical, pharmaceutical and other industrial sites. Since industrial sites need to exchange more fluids, sometimes different fluid media to be exchanged are exchanged using the same medium, and multiple heat exchangers are needed to exchange heat separately. Shell and tube heat exchangers are large in size and occupy a large space in the factory. Increasing the number will also increase costs. Utility Model Content

[0003] The technical problem solved by the utility model is to provide a shell and tube heat exchanger capable of using the same medium to simultaneously exchange heat with other different media.

[0004] Technical solution: In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0005] A shell and tube heat exchanger comprises a shell, a heat exchange tube arranged in the shell, a first tube sheet connected to one end of the heat exchange tube, a second tube sheet connected to the other end of the heat exchange tube, a first head connected to one end of the shell and a second head connected to the other end of the shell, a first inlet pipe and a first outlet pipe are connected to the shell, a second inlet pipe is connected to the first head, a second outlet pipe is connected to the second head, a first partition plate is arranged in the first head, a second partition plate is arranged in the second head, and a first isolating valve is arranged on the first partition plate.

[0006] Preferably, a second isolating valve is provided on the second partition plate.

[0007] Preferably, the first end cover is connected to a third inlet pipe, and the second end cover is connected to a third outlet pipe.

[0008] Preferably, the first partition plate divides the space inside the first head into a first chamber and a second chamber, and the second partition plate divides the space inside the second head into a third chamber and a fourth chamber.

[0009] Preferably, the second inlet pipe is communicated with the first chamber, the third inlet pipe is communicated with the second chamber, the second outlet pipe is communicated with the third chamber, and the third outlet pipe is communicated with the fourth chamber.

[0010] Preferably, the first isolating valve and the second isolating valve are both butterfly valves.

[0011] Preferably, the second inlet pipe is connected to a first delivery pipe, the first delivery pipe is provided with a first on-off valve, and the third inlet pipe is connected to a second delivery pipe, the second delivery pipe is provided with a second on-off valve.

[0012] Preferably, an intermediate pipe is connected between the first delivery pipe and the second delivery pipe, and a third on-off valve is provided on the intermediate pipe.

[0013] Preferably, a filter screen is provided in the first inlet pipe.

[0014] Preferably, a plurality of baffles are provided in the shell, the plurality of baffles are connected to the inner top wall and the inner bottom wall of the shell, and residual discharge holes are provided on the baffles connected to the inner bottom wall.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0016] 1. By providing a first partition plate in the first end cover and a second partition plate in the second end cover, the tube side of the heat exchanger is divided into two parts, and the heat exchange tube can be connected to two different media, so that the heat exchanger can use the same medium to simultaneously exchange heat with two other different media;

[0017] 2. The heat exchange tube is divided into two parts, upper and lower. Using the upper or lower part of the heat exchange tube alone can increase the flow rate in the tube, flush the tube without stopping the machine, and reduce blockage in the tube;

[0018] 3. Two inlet pipes are connected to the first head, and two outlet pipes are connected to the second head. The first partition plate and the second partition plate are both provided with isolation valves. The spaces separated by the partition plates can be communicated. Together with the external delivery pipes and on-off valves, the path of the medium entering the heat exchanger and the path of the medium exiting the heat exchanger can be controlled. The same medium can be discharged to different locations after heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0020] Figure 2 1 is a schematic diagram of the structure of a heat exchanger in an embodiment;

[0021] Figure 3 is a schematic diagram of the structure of the first partition plate and the first isolation valve of the embodiment;

[0022] Figure 4 2. It is a schematic diagram of the baffle structure of an embodiment;

[0023] Figure 5It is a schematic diagram of the structure of the filter screen cartridge of the embodiment. DETAILED DESCRIPTION

[0024] The present invention will be further explained below in conjunction with specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0025] like Figure 2 , Figure 4 and Figure 5 As shown, a shell and tube heat exchanger includes a shell 1, a heat exchange tube 2, a first tube sheet 3, a second tube sheet 4, a first head 5 and a second head 6. The shell 1 is a circular tubular shell. A plurality of heat exchange tubes 2 are arranged in the shell 1. The plurality of heat exchange tubes 2 extend from one end of the shell 1 to the other end. The first tube sheet 3 is connected to the shell 1 and the first tube sheet 3 is connected to one end of the plurality of heat exchange tubes 2. The second tube sheet 4 is also connected to the shell 1 and the second tube sheet 4 is connected to the other end of the plurality of heat exchange tubes 2. The first head 5 is connected to the left end of the shell 1 and seals the left end of the shell 1. The second head 6 is connected to the right end of the shell 1 and seals the right end of the shell 1. A first inlet pipe 11 is connected to one end of the shell 1 close to the first head 5. The first inlet pipe 11 is used to introduce a first medium involved in heat exchange. A filter screen cartridge 13 is provided in the first inlet pipe 11. The filter screen cartridge 13 includes a top ring 131, a side wall cartridge 132 connected to the top ring 131, and a bottom plate 133 connected to the lower end of the side wall cartridge 132. A retaining ring corresponding to the top ring 131 is provided on the inner wall of the first inlet pipe 11. When the filter screen cartridge 13 is placed on the first inlet pipe 11, it is blocked by the retaining ring and no longer moves downward. The side wall cartridge 132 is provided with filter holes for filtering. The bottom plate 133 directly bears the impact pressure of the first medium. The filter screen cartridge 13 can filter the first medium on the one hand, and reduce the direct impact of the first medium on the heat exchange tube 2 on the other hand, thereby protecting the heat exchange tube 2. The first outlet pipe 12 is connected to one end of the shell 1 near the second end cap 6. The first medium outside the first inlet pipe 11 enters the shell 1 to exchange heat with the medium in the heat exchange pipe 2. A plurality of baffles 14 are provided in the shell 1. The plurality of baffles 14 are connected to the inner top wall and the inner bottom wall of the shell 1. The first medium entering the shell 1 through the first inlet pipe 11 is baffled by the plurality of baffles 14 and then discharged from the first outlet pipe 12. A residual discharge hole 141 is provided on the baffle 14 connected to the inner bottom wall. The residual discharge hole 141 is set at the lowest point of the baffle 14. When the heat exchanger is not working, it is necessary to discharge the first medium remaining in the shell 1. The residual discharge hole 141 is set. The first medium can flow to the first outlet pipe 12 through the residual discharge hole 141 and be discharged. The residual discharge hole 141 has a small flow area and has little effect on the flow path of the first medium when the heat exchanger is working.

[0026] like Figure 2 and Figure 3As shown, the upper side of the first end cap 5 is connected to the second inlet pipe 51, the lower side of the first end cap 5 is connected to the third inlet pipe 52, a first partition plate 71 is provided inside the first end cap 5, the first partition plate 71 is arranged in the middle of the first end cap 5, the first partition plate 71 is an arc-shaped plate, the arc-shaped edge of the first partition plate 71 is connected to the inner wall of the first end cap 5, a sealing strip is provided on the first tube sheet 3 at a position corresponding to the first partition plate 71, the sealing strip divides the plurality of heat exchange tubes 2 on the first tube sheet 3 into an upper half and a lower half, when the first end cap 5 is connected to the shell 1 When connected, a space for accommodating the medium is formed between the first head 5 and the shell 1, and the space is connected to the heat exchange tube 2. The first partition plate 71 is against the first tube sheet 3, and the first partition plate 71 divides the space inside the first head 5 into a first chamber 501 and a second chamber 502. The second inlet pipe 51 is connected to the first chamber 501, and the first chamber 501 is connected to the heat exchange tubes 2 in the upper half of the plurality of heat exchange tubes 2. The third inlet pipe 52 is connected to the second chamber 502, and the second chamber 502 is connected to the heat exchange tubes 2 in the lower half of the plurality of heat exchange tubes 2. The shape of the second end cap 6 corresponds to the first end cap 5. The upper side of the second end cap 6 is connected to the second outlet pipe 61, and the lower side of the second end cap 6 is connected to the third outlet pipe 62. A second partition plate 72 is provided in the second end cap 6. The second partition plate 72 is arranged in the middle of the second end cap 6. The second partition plate 72 is also an arc plate. The arc edge of the second partition plate 72 is connected to the inner wall of the second end cap 6. A sealing strip is provided on the second tube sheet 4 at a position corresponding to the first partition plate 71. The sealing strip divides the plurality of heat exchange tubes 2 on the second tube sheet 4 into an upper half and a lower half. When the second When the head 6 is connected to the shell 1, a space for accommodating the medium is formed between the second head 6 and the shell 1, and the space is connected to the heat exchange tube 2. The second partition plate 72 is against the second tube sheet 4, and the second partition plate 72 divides the space inside the second head 6 into a third chamber 601 and a fourth chamber 602. The second outlet pipe 61 is connected to the third chamber 601, and the third chamber 601 is connected to the heat exchange tubes 2 in the upper half of the plurality of heat exchange tubes 2. The third outlet pipe 62 is connected to the fourth chamber 602, and the fourth chamber 602 is connected to the heat exchange tubes 2 in the lower half of the plurality of heat exchange tubes 2.

[0027] like Figure 2 and Figure 3 As shown, a first isolation valve 81 is provided on the first partition plate 71, and a second isolation valve 82 is provided on the second partition plate 72. Both the first isolation valve 81 and the second isolation valve 82 are butterfly valves. When the first isolation valve 81 is opened, the first chamber 501 is connected with the second chamber 502, and when the second isolation valve 82 is opened, the third chamber 601 is connected with the fourth chamber 602.

[0028] like Figure 1 and Figure 2As shown, the second inlet pipe 51 is connected to the first delivery pipe 91, and the first delivery pipe 91 is provided with a first on-off valve 83. The third inlet pipe 52 is connected to the second delivery pipe 92, and the second delivery pipe 92 is provided with a second on-off valve 84. The first on-off valve 83 and the second on-off valve 84 can control the entry of the heat exchange medium. An intermediate pipe 93 is connected between the first delivery pipe 91 and the second delivery pipe 92, and the intermediate pipe 93 is provided with a third on-off valve 85.

[0029] When the heat exchanger is in use, when it is necessary to exchange heat with the second medium, the first on-off valve 83, the second on-off valve 84 and the third on-off valve 85 can be controlled to be on and off so that the second medium enters the heat exchange tube 2 from the second inlet pipe 51 to exchange heat with the first medium, or enters the heat exchange tube 2 from the third inlet pipe 52 to exchange heat with the first medium, or enters the heat exchange tube 2 from the second inlet pipe 51 and the third inlet pipe 52 at the same time to exchange heat with the first medium;

[0030] When the flow rate of the second medium is greater than or equal to a predetermined value, the first isolation valve 81 is opened, and all the heat exchange tubes 2 participate in the heat exchange work. The second medium after heat exchange can be discharged from the second outlet pipe 61 or the third outlet pipe 62. When the second medium needs to be discharged to different locations, the second isolation valve 82 is closed, and the second outlet pipe 61 and the third outlet pipe 62 respectively discharge the second medium to different locations;

[0031] When the flow rate of the second medium is less than a predetermined value, only half of the heat exchange tubes 2 can be used to participate in the heat exchange. For example, the first isolating valve 81 and the second isolating valve 82 are closed, and the second medium enters the upper part of the heat exchange tube 2 from the second inlet pipe 51, and is discharged from the second outlet pipe 61 after heat exchange. Only half of the heat exchange tubes 2 are used to participate in the work, which can increase the flow rate in the heat exchange tube 2 and prevent impurities from accumulating in the heat exchange tube 2 and causing blockage due to a small flow rate and slow flow rate of the second medium when all the heat exchange tubes 2 are used. The method of using only half of the heat exchange tubes 2 to work can also play a flushing role in normal work and reduce blockage of the heat exchange tube 2.

[0032] When the heat exchanger is in use, when it is necessary to simultaneously exchange heat between two different media, the second medium and the third medium, the third on-off valve 85 is closed, the first on-off valve 83 and the second on-off valve 84 are opened, the first isolating valve 81 and the second isolating valve 82 are closed, the second medium enters the heat exchange tube 2 from the second inlet pipe 51 to exchange heat with the first medium, and is discharged from the second outlet pipe 61 after the heat exchange; the third medium enters the heat exchange tube 2 from the third inlet pipe 52 to exchange heat with the first medium, and is discharged from the third outlet pipe 62 after the heat exchange, so that the heat exchanger can use the first medium to simultaneously exchange heat with the other two different media.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A shell and tube heat exchanger, characterized in that: The invention comprises a shell (1), a heat exchange tube (2) arranged in the shell (1), a first tube sheet (3) connected to one end of the heat exchange tube (2), a second tube sheet (4) connected to the other end of the heat exchange tube (2), a first end cap (5) connected to one end of the shell (1), and a second end cap (6) connected to the other end of the shell (1); the shell (1) is connected to a first inlet tube (11) and a first outlet tube (12); the first end cap (5) is connected to a second inlet tube (51); the second end cap (6) is connected to a second outlet tube (61); a first partition plate (71) is arranged in the first end cap (5); a second partition plate (72) is arranged in the second end cap (6); and a first isolating valve (81) is arranged on the first partition plate (71).

2. The shell and tube heat exchanger according to claim 1, characterized in that: A second isolation valve (82) is provided on the second partition plate (72).

3. The shell and tube heat exchanger according to claim 2, characterized in that: The first sealing head (5) is connected to a third inlet pipe (52), and the second sealing head (6) is connected to a third outlet pipe (62).

4. The shell and tube heat exchanger according to claim 3, characterized in that: The first partition plate (71) divides the space inside the first head (5) into a first chamber (501) and a second chamber (502), and the second partition plate (72) divides the space inside the second head (6) into a third chamber (601) and a fourth chamber (602).

5. The shell and tube heat exchanger according to claim 4, characterized in that: The second inlet pipe (51) is connected to the first chamber (501), the third inlet pipe (52) is connected to the second chamber (502), the second outlet pipe (61) is connected to the third chamber (601), and the third outlet pipe (62) is connected to the fourth chamber (602).

6. The shell and tube heat exchanger according to claim 2, characterized in that: The first isolation valve (81) and the second isolation valve (82) are both butterfly valves.

7. The shell and tube heat exchanger according to claim 3, characterized in that: The second inlet pipe (51) is connected to a first delivery pipe (91), and the first delivery pipe (91) is provided with a first on-off valve (83); the third inlet pipe (52) is connected to a second delivery pipe (92), and the second delivery pipe (92) is provided with a second on-off valve (84).

8. The shell and tube heat exchanger according to claim 7, characterized in that: An intermediate pipe (93) is connected between the first delivery pipe (91) and the second delivery pipe (92), and a third on-off valve (85) is provided on the intermediate pipe (93).

9. The shell and tube heat exchanger according to claim 1, characterized in that: A filter screen cylinder (13) is provided in the first inlet pipe (11).

10. The shell and tube heat exchanger according to claim 1, characterized in that: A plurality of baffles (14) are arranged in the shell (1), the plurality of baffles (14) are connected to the inner top wall and the inner bottom wall of the shell (1), and a residual discharge hole (141) is arranged on the baffle (14) connected to the inner bottom wall.

Images