Baffle rod heat exchanger with slotted baffle

Abstract

The utility model discloses a baffle rod heat exchanger with slotted baffles, which comprises a tube pass fluid outlet flange, a tube pass fluid outlet water distribution chamber, a shell pass fluid inlet section, a shell pass fluid inlet water distribution chamber, a main heat exchange section, a shell pass fluid outlet water distribution chamber, a shell pass fluid outlet section, a tube pass fluid inlet water distribution chamber and a tube pass fluid inlet flange, the tube diameters of the tube pass fluid inlet water distribution chamber and the tube pass fluid outlet water distribution chamber are equal to the shell diameter of the main heat exchange section, so that the tube pass fluid resistance is reduced, and the tube pass fluid is uniformly distributed in the heat exchange tube; a shell pass fluid inlet water distribution chamber and a shell pass fluid outlet water distribution chamber are arranged independently, no baffle rod is arranged in the water distribution chambers, and a slotted baffle is arranged in the shell pass fluid inlet water distribution chamber. According to the baffle rod heat exchanger, the low resistance characteristic of the shell pass of the baffle rod heat exchanger is maintained, meanwhile, the high-flow-speed area of shell pass fluid is distributed on the periphery of each heat exchange pipe in the main heat exchange section in a concentrated mode, and particularly, the heat transfer effect of the heat exchange pipes is guaranteed under the working condition of the low Reynolds number.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a baffle rod heat exchanger with a slotted baffle. Background Art

[0002] The baffle rod heat exchanger is a shell and tube heat exchanger in which the heat exchange tube bundle in the shell is supported by a series of baffle rods. Compared with the traditional baffle plate heat exchanger, the shell side structure of the baffle rod makes the shell side fluid flow along the axial direction of the shell side, that is, the fluid flows longitudinally, replacing the original cross flow. The usual baffle rod heat exchanger is only used for working conditions with relatively large shell side flow, that is, the Reynolds number (Re) is large. The heat transfer effect is poor under low Reynolds number conditions, and is even worse than the traditional baffle plate heat exchanger. Improving the heat transfer effect of the baffle rod heat exchanger under low Reynolds number conditions has very important practical value.

[0003] The tube-side fluid resistance of a shell and tube heat exchanger is usually small; in some renovation projects, the original tube-side fluid circulation pump pressure head margin is not large, and it is very important to find ways to further reduce the tube-side fluid resistance.

[0004] Traditional baffle rod heat exchangers lack measures to evenly distribute water at the inlet and outlet of the tube side and shell side. On the one hand, this leads to poor heat transfer effect of the heat exchanger; on the other hand, it is easy to cause large vibration of the heat exchange tube bundle, friction with the baffle rods, and even cause the heat exchange tube to be worn through. Utility Model Content

[0005] The utility model aims to provide a baffle rod heat exchanger with a slotted baffle plate to solve the existing problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a baffled rod heat exchanger with a slit baffle, comprising a tube-side fluid outlet flange, a tube-side fluid outlet water distribution chamber, a shell-side fluid inlet section, a shell-side fluid inlet water distribution chamber, a main heat exchange section, a shell-side fluid outlet water distribution chamber, a shell-side fluid outlet section, a tube-side fluid inlet water distribution chamber, and a tube-side fluid inlet flange; the tube-side fluid inlet water distribution chamber and the tube-side fluid outlet water distribution chamber are optimized, and independent shell-side fluid inlet water distribution chambers and shell-side fluid outlet water distribution chambers are respectively provided and optimized.

[0007] Preferably, the diameters of the optimized tube-side fluid inlet water distribution chamber and the tube-side fluid outlet water distribution chamber are equivalent to the shell diameter of the main heat exchange section, which has the beneficial effect of reducing the tube-side fluid resistance and making the tube-side fluid evenly distributed in the heat transfer tube.

[0008] Preferably, independent shell-side fluid inlet water distribution chambers and shell-side fluid outlet water distribution chambers are respectively provided, and no deflector rods are provided inside. A slit baffle is provided in the shell-side fluid inlet water distribution chamber. The beneficial effect is that while maintaining the low resistance characteristics of the shell side of the deflector rod heat exchanger, the high flow velocity area of ​​the shell-side fluid is concentrated around each heat exchange tube in the main heat exchange section. In particular, under low Reynolds number conditions, the heat transfer effect of the heat exchange tube is guaranteed.

[0009] Compared with the prior art, the beneficial effect of the utility model is that the baffle rod heat exchanger with a slit baffle maintains the low resistance characteristics of the shell side of the baffle rod heat exchanger while concentrating the high flow rate area of ​​the shell side fluid around each heat exchange tube in the main heat exchange section, especially under low Reynolds number conditions, the heat transfer effect of the heat exchange tube is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of a baffle rod heat exchanger with a slotted baffle according to the utility model;

[0011] Figure 2 It is a schematic diagram of a shell-side fluid inlet section and a shell-side fluid inlet water distribution chamber of a baffle rod heat exchanger with a slotted baffle according to the utility model;

[0012] Figure 3 The utility model is a schematic diagram of a slotted baffle of a baffle rod heat exchanger with a slotted baffle.

[0013] In the figure: 1. tube-side fluid outlet flange; 2. tube-side fluid outlet water distribution chamber; 3. shell-side fluid inlet section; 4. shell-side fluid inlet water distribution chamber; 4-1. shell-side fluid inlet water distribution chamber shell; 4-2. heat exchange tube; 4-3. slit baffle; 5. main heat exchange section; 6. shell-side fluid outlet water distribution chamber; 7. shell-side fluid outlet section; 8. tube-side fluid inlet water distribution chamber; 9. tube-side fluid inlet flange. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0015] like Figure 1 As shown, a baffle rod heat exchanger with a slotted baffle comprises a tube-side fluid outlet flange 1, a tube-side fluid outlet water distribution chamber 2, a shell-side fluid inlet section 3, a shell-side fluid inlet water distribution chamber 4, a main heat exchange section 5, a shell-side fluid outlet water distribution chamber 6, a shell-side fluid outlet section 7, a tube-side fluid inlet water distribution chamber 8, and a tube-side fluid inlet flange 9; Figure 2 As shown, it includes a shell-side fluid inlet section 3 and a shell-side fluid inlet water distribution chamber 4; the components of the shell-side fluid inlet water distribution chamber 4 include a shell-side fluid inlet water distribution chamber shell 4-1, a heat exchange tube 4-2 and a slotted baffle 4-3; the slotted baffle 4-3 is as shown Figure 3 shown.

[0016] In order to reduce the fluid resistance in the tube side and ensure uniform water distribution of the fluid in the tube side, the diameters of the tube side fluid inlet water distribution chamber 8 and the tube side fluid outlet water distribution chamber 2 are equivalent to the shell diameter of the main heat exchange section 5.

[0017] It should be noted that this type of heat exchanger further reduces the tube-side resistance while ensuring the uniform distribution of the tube-side fluid flow to each heat exchange tube 4-2; in some waste heat utilization renovation projects, the original tube-side fluid circulation pump pressure head surplus is not large. After the new baffle rod heat exchanger further reduces the tube-side fluid resistance, the renovation project does not need to modify the circulation pump or add a booster pump, which has the beneficial effect of saving operating electricity costs and project investment.

[0018] Furthermore, independent shell-side fluid inlet water distribution chamber 4 and shell-side fluid outlet water distribution chamber 6 are respectively provided, and no deflector rods are provided inside; a slit baffle 4-3 is provided in the shell-side fluid inlet water distribution chamber, and the slit position of the slit baffle 4-3 is directly opposite to the shell-side fluid inlet section 3, and the slit length is equivalent to the diameter of the shell-side fluid inlet section 3; its beneficial effect is that while maintaining the low resistance characteristics of the shell side of the deflector rod heat exchanger, the high flow rate area of ​​the shell-side fluid is concentrated around each heat exchange tube 4-2 in the main heat exchange section, especially, under low Reynolds number conditions, the heat transfer effect of the heat exchange tube is guaranteed; the structure and principle of the deflector rod heat exchanger can be known by professional and technical personnel through numerical simulation or through conventional experimental methods.

[0019] The above shows and describes the basic principles, main features and advantages of the utility model; technicians in this industry should understand that the utility model is not limited to the above embodiments, and the above embodiments and descriptions are only for illustrating the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements all fall within the scope of the utility model to be protected; the scope of protection claimed by the present utility model is defined by the attached claims and their equivalents.

Claims

1. A baffle rod heat exchanger with a slotted baffle, comprising a tube-side fluid outlet flange (1), a tube-side fluid outlet water distribution chamber (2), a shell-side fluid inlet section (3), a shell-side fluid inlet water distribution chamber (4), a main heat exchange section (5), a shell-side fluid outlet water distribution chamber (6), a shell-side fluid outlet section (7), a tube-side fluid inlet water distribution chamber (8), and a tube-side fluid inlet flange (9), characterized in that: The pipe diameters of the tube-side fluid inlet water distribution chamber (8) and the tube-side fluid outlet water distribution chamber (2) are equivalent to the shell diameter of the main heat exchange section (5); independent shell-side fluid inlet water distribution chambers (4) and shell-side fluid outlet water distribution chambers (6) are respectively provided, and no deflector rods are provided inside the water distribution chambers.

2. A baffle rod heat exchanger with a slotted baffle according to claim 1, characterized in that: A slotted baffle (4-3) is arranged in the shell-side fluid inlet water distribution chamber (4), the slotted position of the slotted baffle (4-3) is directly opposite to the shell-side fluid inlet section (3), and the slotted length is equivalent to the diameter of the shell-side fluid inlet section (3).

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