Floating head type heat exchanger

Abstract

A floating head type heat exchanger comprises a shell side, a first seal head, a second seal head, a fixed tube plate, a floating tube plate and a plurality of tubes, the fixed tube plate is arranged at one end of the shell side and positioned through the first seal head, an inlet of the first seal head is used for being connected with a material source, and the second seal head is installed at the other end of the shell side and positioned through the floating tube plate. The floating tube plate is arranged in the second end socket in a sliding fit mode, a plurality of tubes are arranged and distributed in parallel, one end of each tube is supported on the fixed tube plate and communicated with the first end socket, the other end of each tube is supported on the floating tube plate and communicated with the second end socket, the hopper-shaped tube pass is located in the second end socket, and the large-opening end of the hopper-shaped tube pass is fixed on the floating tube plate. And the small opening end of the bucket-shaped tube pass is connected with the outlet of the second sealing head through an expansion joint. The heat exchanger is simple in structure, low in improvement cost and capable of meeting the heat exchange requirement of high-temperature-difference fluid media, effectively reducing the residual quantity of heat exchange materials and avoiding material waste.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a floating head type heat exchanger. Background Art

[0002] Shell and tube heat exchangers are one of the conventional equipment in the chemical industry. Common shell and tube heat exchangers include fixed tube sheet shell and tube heat exchangers and floating head shell and tube heat exchangers. Their advantages and disadvantages are as follows:

[0003] 1. Fixed tube sheet type shell and tube heat exchanger has simple structure, light weight, low cost, and is the most commonly used. It requires that the temperature difference between the two fluids should not exceed 70°C, otherwise the temperature difference will be too large, causing large thermal stress between the tube bundle and the shell, causing the tubes and tube sheets to loosen and rupture, resulting in leakage; and the maintenance and cleaning of the tube and shell process are difficult. It is generally used in the heat exchange process of fluids with low corrosiveness and not easy to produce precipitation.

[0004] 2. A movable floating tube sheet is installed at one end of the tube bundle of the floating head type shell and tube heat exchanger. When the shell and the tubes have different thermal expansion, the tubes and the floating tube sheet can expand and contract freely in the shell, so as not to damage the heat exchanger due to the different thermal expansion caused by the temperature difference. In addition, since the floating tube sheet and the tubes can be removed from the shell, it is convenient for cleaning and maintenance. However, the heat exchanger with this structure requires the matching head to have a large internal space, resulting in a large amount of material residue in the head after heat exchange, causing material waste.

[0005] Therefore, how to design a heat exchanger that can adapt to high temperature difference fluid media and reduce the amount of material residue after heat exchange is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0006] The purpose of the utility model is to provide a floating head heat exchanger in view of the deficiencies in the prior art, which has a simple structure and low modification cost, can not only meet the heat exchange requirements of high temperature difference fluid media, but also effectively reduce the residual amount of heat exchange materials and avoid material waste.

[0007] The technical solution of the utility model is: a floating head type heat exchanger, comprising a shell side, a first head, a second head, a fixed tube sheet, a floating tube sheet, and a plurality of tubes, wherein the fixed tube sheet is arranged at one end of the shell side and is positioned by the first head, the inlet of the first head is used to be connected to a material source, the second head is installed at the other end of the shell side, and the floating tube sheet is slidably fitted in the second head, a plurality of tubes are arranged and distributed in parallel, one end is supported on the fixed tube sheet and communicated with the first head, and the other end is supported on the floating tube sheet and communicated with the second head, and also comprises a bucket-shaped tube side, the bucket-shaped tube side is located in the second head, the large-mouth end of the bucket-shaped tube side is fixed on the floating tube sheet and communicated with each tube, and the small-mouth end of the bucket-shaped tube side is connected to the outlet of the second head through an expansion joint.

[0008] The first head is fixedly connected to the shell side via a flange, the fixed tube sheet is located between the first head and the shell side, and a sealing ring is arranged between the fixed tube sheet and the first head, and between the fixed tube sheet and the shell side.

[0009] The second head is fixedly connected to the shell side via a flange, and a sealing ring is arranged between the second head and the shell side.

[0010] The inner diameter of the connecting end of the second head is larger than the inner diameter of the shell side, and the second head is connected to the shell side to form a stepped inner cavity.

[0011] The floating tube sheet comprises a slip ring and a mounting plate. A limited step is arranged on the inner wall of the slip ring. The mounting plate is arranged on the inner wall of the slip ring. The large end of the bucket tube is fixed on the slip ring by a plurality of bolts and the mounting plate is pressed tightly.

[0012] A sealing ring is arranged between the bucket-shaped pipe passage and the mounting plate.

[0013] The above technical solution has the following beneficial effects:

[0014] 1. The floating head heat exchanger includes a shell side, a first head, a second head, a fixed tube sheet, a floating tube sheet, and a plurality of tubes, wherein the shell side is for heat exchange medium to pass through, and the tubes are for process medium (material) to pass through. The fixed tube sheet is arranged at one end of the shell side and is positioned by the first head. The inlet of the first head is used to connect with the material source, that is, one end of the shell side is sealed by the fixed tube sheet. The second head is installed at the other end of the shell side, and the floating tube sheet is slidably fitted in the second head, that is, the other end of the shell side is sealed by the floating tube sheet. A plurality of tubes are arranged in parallel, one end is supported on the fixed tube sheet and connected to the first head, and the other end is supported on the floating tube sheet and connected to the second head, that is, the first head and a plurality of tubes form a tube side, and the tube side passes through the shell side to form a heat exchange area. It also includes a bucket-shaped tube pass, which is located in the second head, and the large end of the bucket-shaped tube pass is fixed on the floating tube sheet and connected with each tube array, that is, the first head, the tube array, and the bucket-shaped tube pass are connected to form a complete heat exchanger tube pass, and the internal space volume of the bucket-shaped tube pass is small, and the aperture from the inlet (large end) to the outlet (small end) gradually decreases, which can effectively avoid the process medium (material) residue and waste of materials. The second head arranged on the periphery forms a protective shell of the bucket-shaped tube pass and prevents the material from leaking out of the heat exchanger. The small end of the bucket-shaped tube pass is connected to the outlet of the second head through an expansion joint. Since the bucket-shaped tube pass is directly fixedly connected to the floating tube sheet, the bucket-shaped tube pass will move with the movement of the floating tube sheet. The bucket-shaped tube pass is connected to the fixed second head outlet through an expansion joint to compensate for the space between the bucket-shaped tube pass and the second head outlet, ensuring the normal operation of the bucket-shaped tube pass.

[0015] 2. The inner diameter of the second head connection end is larger than the inner diameter of the shell side. The second head and the shell side are connected to form a stepped inner cavity, which is convenient for installing the floating tube sheet and limits the floating height of the floating tube sheet.

[0016] 3. The floating tube sheet includes a slip ring and a mounting plate. A limited step is arranged on the inner wall of the slip ring. The mounting plate is arranged on the inner wall of the slip ring. The large-mouth end of the bucket-shaped tube is fixed to the slip ring by a plurality of bolts and the mounting plate is pressed tightly. This makes it convenient to install and disassemble the floating tube sheet and the bucket-shaped tube and reduces maintenance costs.

[0017] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 for Figure 1 Enlarged view of the M in the middle;

[0020] Figure 3 It is a connection schematic diagram of the expansion joint of the utility model.

[0021] In the attached drawings, 1 is the first head, 2 is the second head, 3 is the shell side, 4 is the fixed tube sheet, 5 is the floating tube sheet, 51 is the slip ring, 52 is the mounting plate, 6 is the tube array, 7 is the bucket tube side, and 8 is the expansion joint. DETAILED DESCRIPTION

[0022] See also Figures 1 to 3, which is a specific embodiment of a floating head heat exchanger. The floating head heat exchanger includes a shell side 3, a first head 1, a second head 2, a fixed tube sheet 4, a floating tube sheet 5, and a plurality of tubes 6. Obviously, the tube side is provided with a heat exchange medium inlet, a heat exchange medium outlet, and a drain port. The fixed tube sheet 4 is arranged at one end of the shell side and is positioned by the first head 1. The inlet of the first head is used to connect with the material source. In this embodiment, the first head 1 is fixedly connected to the shell side 3 by a flange, the fixed tube sheet 4 is located between the first head 1 and the shell side 3, and a sealing ring is arranged between the fixed tube sheet 4 and the first head 1, and a sealing ring is arranged between the fixed tube sheet 4 and the shell side 3. The second end cap 2 is installed at the other end of the shell side, and the floating tube sheet 5 is slidably fitted in the second end cap 2. In this embodiment, the second end cap 2 is fixedly connected to the shell side 3 by a flange, and the inner diameter of the connecting end of the second end cap 2 is larger than the inner diameter of the shell side 3. The second end cap 2 is connected to the shell side 3 to form a stepped inner cavity, and it is obvious that a sealing ring is provided between the second end cap and the other end of the shell side. Specifically, the floating tube sheet includes a slip ring 51 and a mounting plate 52. The slip ring 51 is slidably fitted in the second end cap, and a limited step is provided on the inner wall of the slip ring 51, and the mounting plate 52 is provided on the inner wall of the slip ring. A plurality of tubes 6 are arranged in parallel, one end of which is supported on the fixed tube sheet 4 and is connected to the first end cap 1, and the other end of which is supported on the floating tube sheet 5 and is connected to the second end cap 2. It also includes a bucket-shaped tube 7, which is located in the second end cap 2. The large end of the bucket-shaped tube 7 is fixed to the slip ring of the floating tube sheet by multiple bolts, and the mounting plate 52 is pressed to make the large end of the bucket-shaped tube communicate with each tube 6, and a sealing ring is arranged between the bucket-shaped tube 7 and the mounting plate 52. In addition, the large end of the bucket-shaped tube itself also cooperates with the inner wall clearance of the second end cap and cooperates with the slip ring to provide a larger friction sealing area. The small end of the bucket-shaped tube 7 is connected to the outlet of the second end cap 2 through an expansion joint 8. Specifically, one end of the expansion joint is welded and fixed to the small end of the bucket-shaped tube, and the other end is interference fit with the outlet of the second end cap.

[0023] The working principle of the utility model is as follows: the heat exchange medium circulates in the shell side, the process medium (material) enters from the inlet of the first head, passes through the shell side through a plurality of tubes for heat exchange, enters the bucket tube side, and finally is discharged from the heat exchanger through the outlet of the second head to complete the heat exchange purpose.

Claims

1. A floating head heat exchanger, comprising a shell side (3), a first end cap (1), a second end cap (2), a fixed tube sheet (4), a floating tube sheet (5), and a plurality of tubes (6), wherein the fixed tube sheet (4) is arranged at one end of the shell side and positioned by the first end cap (1), an inlet of the first end cap is used to be connected to a material source, the second end cap (2) is installed at the other end of the shell side, and the floating tube sheet (5) is slidably fitted in the second end cap (2), a plurality of tubes (6) are arranged and distributed in parallel, one end of which is supported on the fixed tube sheet (4) and communicated with the first end cap (1), and the other end of which is supported on the floating tube sheet (5) and communicated with the second end cap (2), characterized in that: It also includes a bucket-shaped tube pass (7), which is located in the second end cap (2). The large end of the bucket-shaped tube pass (7) is fixed on the floating tube sheet (5) and is connected to each row of tubes (6). The small end of the bucket-shaped tube pass (7) is connected to the outlet of the second end cap (2) through an expansion joint (8).

2. The floating head heat exchanger according to claim 1, characterized in that: The first end cap (1) and the shell side (3) are fixedly connected via a flange, the fixed tube sheet (4) is located between the first end cap (1) and the shell side (3), and a sealing ring is provided between the fixed tube sheet (4) and the first end cap (1), and a sealing ring is provided between the fixed tube sheet (4) and the shell side (3).

3. The floating head heat exchanger according to claim 1, characterized in that: The second head (2) and the shell side (3) are fixedly connected via a flange, and a sealing ring is provided between the second head (2) and the shell side (3).

4. The floating head heat exchanger according to claim 3, characterized in that: The inner diameter of the connecting end of the second head (2) is greater than the inner diameter of the shell side (3); the second head (2) and the shell side (3) are connected to form a stepped inner cavity.

5. The floating head heat exchanger according to claim 1, characterized in that: The floating tube sheet (5) comprises a slip ring (51) and a mounting plate (52). A limit step is arranged on the inner wall of the slip ring (51). The mounting plate (52) is arranged on the inner wall of the slip ring. The large end of the bucket-shaped tube passage (7) is fixed to the slip ring (51) by a plurality of bolts and the mounting plate (52) is pressed tightly.

6. The floating head heat exchanger according to claim 5, characterized in that: A sealing ring is provided between the bucket-shaped pipe (7) and the mounting plate (52).

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