Efficient heat exchanger with parallel vein flow baffles

Abstract

The utility model belongs to the technical field of heat exchangers, and particularly relates to an efficient heat exchanger with parallel vein flow baffles, a plurality of flow baffles are arranged in a shell along the length direction of the shell, a pipe distribution area is divided into a plurality of flow guide areas by the flow baffles on a normal plane in the length direction of the shell, and a plurality of heat exchange pipes are uniformly distributed in each flow guide area. According to the utility model, the plurality of groups of leaf vein flow baffles which are uniformly distributed in parallel divide the heat exchange tubes in the tube distribution area into a plurality of equal areas, and the structural design of the leaf vein flow baffles not only can completely overcome the defects of a common arch-shaped baffle plate structure, but also can keep the heat exchange efficiency stable in the heat exchange process, eliminate a heat transfer dead zone, reduce the pressure drop and improve the heat exchange efficiency. And the heat transfer efficiency of the heat exchanger is greatly improved.

Description

Technical Field

[0001] This utility model relates to a high-efficiency heat exchanger with parallel blade baffles, belonging to the field of heat exchangers. Background Technology

[0002] Shell-and-tube heat exchangers, as a common type of heat exchange equipment, play an important role in the petrochemical industry. Their internal structure has a significant impact on heat exchange efficiency and service life. Among them, the baffle plate, as one of the key components of the internal structure, is crucial to the operation of the heat exchanger due to its selection of form and structural design.

[0003] As one of the most common baffle structures, the bow-shaped baffle works on the principles of fluid dynamics and pressure balance. It consists of a series of flat plates and curved arc-shaped plates, which can be arranged in different ways to achieve various fluid control and flow regulation functions. Specifically, the arrangement and geometry of the bow-shaped baffle can create different pressures on the upper and lower sides of the plate, thus controlling and regulating the fluid flow. When fluid passes through the bow-shaped baffle, the pressure on the upper side of the plate is higher than that on the lower side; this pressure difference can be used to control the flow rate and velocity of the fluid.

[0004] However, in actual operation of the heat exchanger, the arc-shaped baffle also has its own disadvantages, specifically including:

[0005] 1) Large pressure drop: The bow-shaped baffle plate will cause a large pressure drop, which may affect the heat exchange efficiency of the heat exchanger.

[0006] 2) Dead zone is easily formed: In heat exchangers with bow-shaped baffles, the fluid is prone to forming a dead zone behind the baffles, resulting in poor heat transfer performance.

[0007] 3) Prone to vibration: High mass flow rates may cause vibration of the heat exchange tubes, shortening the service life of the heat exchanger. Utility Model Content

[0008] This invention overcomes the shortcomings of existing shell-and-tube heat exchanger bow-shaped baffle structure design technology and provides a high-efficiency heat exchanger with parallel vein baffles.

[0009] The utility model discloses parallel leaf vein baffle high -efficient heat exchanger, including shell, left and right tube box and tube bundle, is equipped with shell side medium access on the shell, and shell side medium access is divided and is equipped on the both sides of shell length direction, is equipped with the tube side medium access on the tube box, is equipped with a plurality of along its length direction setting baffle in the shell, on the normal plane of shell length direction, baffle divides the pipe arrangement area into a plurality of guide area, and each guide area is distributed with a plurality of heat exchange pipes, baffle is V -shaped, and the top layer baffle in the middle of shell side medium access is closed, and the middle of a plurality of middle layer baffles and the bottom layer baffle close to shell side medium export is opened, and the top layer baffle and middle layer baffle are all set with the clearance of shell inner wall, and form annular liquid inlet flow channel, and the opening in the middle of middle layer baffle and bottom layer baffle forms vertical liquid outlet flow channel.

[0010] Preferably, on the normal plane of shell length direction, the baffle and the heat exchange pipe are arranged left and right symmetrically.

[0011] Preferably, the plurality of baffles are parallel to each other and arranged uniformly.

[0012] Preferably, the tube side medium access is located on the tube box of the same end, and is coaxially arranged on the tube box; the tube box is provided with a distance separating plate.

[0013] The shell comprises a large cylinder, a tapered cylinder and a small cylinder, the small cylinder is located at both ends of the large cylinder, and the small cylinder and the large cylinder are transitioned through the tapered cylinder.

[0014] The tube bundle comprises two left and right tube plates, a plurality of support plates in the middle, a plurality of heat exchange pipes and a plurality of baffles, the heat exchange pipes are installed at both ends of the left and right tube plates, the plurality of heat exchange pipes penetrate through the plurality of vertical support plates, and the baffles are installed between adjacent support plates.

[0015] The plurality of parallel and uniformly distributed baffles form leaf veins, and the heat exchange pipes in the pipe arrangement area are divided into a plurality of equal zones.

[0016] A group of baffles arranged at the top layer close to the shell side medium access are in closed V-shaped structure, which has the functions of flow separation and impact prevention.

[0017] A group of elongated baffles are arranged at the bottom layer close to the shell side medium export, one end of the elongated baffle is welded to the inner wall of the large cylinder, the other side is installed between the support plates, the annular flow space of the shell side medium is terminated here, and the elongated baffle has the functions of flow separation and backflow.

[0018] The intermediate plurality of sets of inclined, parallel and uniformly arranged baffles are in the form of non-closed V-shaped structure, which divides the heat exchange tubes in the pipe arranging area into several equal sub-zones, so that the medium entering each sub-zone has approximately the same heat exchange amount. The inclined arrangement of the baffles not only can make the flow and heat exchange space without dead zone, but also can make the medium more easily flow into each heat exchange sub-zone by means of fluid kinetic energy, greatly reducing the flow resistance of the medium.

[0019] During the operation of the heat exchanger, the hot medium flows into the heat exchange tubes from the tube side medium inlet of the left tube box, exchanges heat through the tube bundle, and finally flows out of the heat exchanger from the tube side medium outlet of the left tube box after returning and flowing back through the right tube box. After the cold medium flows into the shell side space from the shell side medium inlet, it first reaches the top layer of baffles at the shell side medium inlet, and the top layer of baffles is in the form of closed V-shaped structure. After being divided and prevented from colliding by the top layer of baffles, the shell side medium flows into the annular flow space (i.e. annular liquid inlet flow channel), and under the assistance of fluid power and the inclination angle of the intermediate baffles, the shell side medium will flow into each sub-zone divided by the intermediate baffles from the annular flow space. In each sub-zone, the shell side medium exchanges heat with the medium in the heat exchange tubes. Since the number of heat exchange tubes in each sub-zone is almost equal, the heat exchange amount of the medium in each sub-zone is almost the same, and the heat exchange efficiency is also almost the same. Moreover, due to the structural design advantages of the baffles, the flow resistance of the medium is smaller, and the heat transfer dead zone is almost zero during the entire heat exchange process. Compared with the ordinary heat exchanger with arc-shaped baffles, the shell side medium passes through the arc-shaped baffles to exchange heat, and the heat exchange efficiency continuously decreases from the shell side medium inlet to the outlet due to the continuous formation of pressure drop and heat transfer dead zone. The structural design of the parallel vane baffles not only completely overcomes the shortcomings of the ordinary arc-shaped baffles, but also keeps the heat exchange efficiency stable during the heat exchange process, eliminates the heat transfer dead zone, reduces the pressure drop, and greatly improves the heat transfer efficiency of the heat exchanger.

[0020] After the heat exchange process is completed, the medium in each sub-zone will flow out from the non-closed central position (i.e. vertical liquid outlet flow channel) of each intermediate baffle and the bottom layer of baffles, and finally flow out of the heat exchanger from the shell side medium outlet after continuously converging.

[0021] The utility model has the advantages that compared with the prior art, the application can keep the heat exchange efficiency of the medium in the shell side heat exchange space stable, eliminate the heat transfer dead zone, greatly reduce the pressure drop, and greatly improve the heat transfer efficiency of the heat exchanger.

[0022] 1. The application of the utility model can keep the heat exchange efficiency of the medium in the shell side heat exchange space stable, eliminate the heat transfer dead zone, greatly reduce the pressure drop, and greatly improve the heat transfer efficiency of the heat exchanger.

[0023] 2. The application of the utility model can reduce the vibration of the heat exchange tubes during the heat exchange process, and effectively prolong the service life of the heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic view of the utility model;

[0025] Figure 2 is a medium flow distribution schematic view of the utility model.

[0026] In the figure: 1, large cylinder body; 2, shell side medium inlet; 3, cone cylinder; 4, small cylinder body; 5, tube side medium inlet; 6, left tube box; 7, split distance partition; 8, tube side medium outlet; 9, tube plate; 10, support plate; 11, heat exchange tube; 12, shell side medium outlet; 13, baffle; 13.1, top layer baffle; 13.2, middle layer baffle; 13.3, bottom layer baffle; 14, right tube box. DETAILED DESCRIPTION

[0027] The utility model is further described below in combination with specific embodiments.

[0028] The description of the utility model is only an embodiment of structural and functional description, and the scope of the utility model is not limited by the embodiment described in the text.

[0029] As shown in Figure 1 , 2 , the parallel vein baffle high-efficiency heat exchanger includes a shell, a left tube box 6, a right tube box 14 and a tube bundle. The shell includes a large cylinder body 1, a cone cylinder 3 and a small cylinder body 4. The small cylinder body 4 is located at both ends of the large cylinder body 1, and the small cylinder body 4 and the large cylinder body 1 are transitionally welded together through the cone cylinder 3. The tube bundle includes two left and right tube plates 9, a plurality of support plates 10 in the middle, a plurality of heat exchange tubes 11 and a plurality of baffles 13. The heat exchange tubes 11 are installed at both ends of the left and right tube plates 9, the plurality of heat exchange tubes 11 penetrate through the plurality of vertical support plates 10, and the baffles 13 are installed between adjacent support plates 10. The large cylinder body 1 is provided with a shell side medium inlet 2 and a shell side medium outlet 12, and the shell side medium inlet 2 and the shell side medium outlet 12 are separately arranged on the upper and lower sides of the large cylinder body 1. The left tube box 6 is provided with a tube side medium inlet 5 and a tube side medium outlet 8, and the tube side medium inlet 5 and the tube side medium outlet 8 are oppositely arranged. The left tube box 6 is provided with a split distance partition 7.

[0030] A plurality of baffles 13 are arranged in the shell along the length direction of the shell. In a plane perpendicular to the length direction of the shell, the baffles 13 divide the tube arrangement area into a plurality of flow guide areas, and a plurality of heat exchange tubes 11 are distributed in each flow guide area. The baffles 13 are in V-shape, the top layer of baffles 13.1 is closed in the middle and the middle layer of baffles 13.2 and the bottom layer of baffles 13.3 are open in the middle, the top layer of baffles 13.1 and the middle layer of baffles 13.2 are arranged with gaps from the inner wall of the shell to form annular liquid inlet flow channels, and the openings in the middle of the middle layer of baffles 13.2 and the bottom layer of baffles 13.3 form vertical liquid outlet flow channels. In a plane perpendicular to the length direction of the shell, the baffles 13 and the heat exchange tubes 11 are arranged symmetrically left and right, the plurality of baffles 13 are parallel to each other and arranged uniformly.

[0031] The plurality of parallel and uniformly distributed vein baffles in the utility model evenly divide the heat exchange tubes in the tube arrangement area into a plurality of equal areas. The structural design of the vein baffles not only completely overcomes the shortcomings of the common arc baffle structure, but also keeps the heat exchange efficiency stable during the heat exchange process, eliminates the heat transfer dead zone, reduces the pressure drop, and greatly improves the heat transfer efficiency of the heat exchanger.

[0032] Of course, the above content is only the preferred embodiment of the utility model, and cannot be considered as limiting the scope of the embodiment of the utility model. The utility model is not limited to the above examples, and the equivalent changes and improvements made by ordinary technical personnel in the essential range of the utility model should be attributed to the patent coverage range of the utility model.

Claims

1. A parallel-vein baffle high-efficiency heat exchanger, comprising a shell, left and right tube boxes, and tube bundles, wherein the shell is provided with shell-side medium inlet and outlet, which are respectively located on the upper and lower sides of the shell, and the tube boxes are provided with tube-side medium inlet and outlet, characterized in that, The housing is provided with several baffles (13) arranged along its length; On the normal plane along the length of the shell, the baffle (13) divides the pipe distribution area into several flow guiding zones, and several heat exchange tubes (11) are distributed in each flow guiding zone; the baffle (13) is V-shaped, with the top baffle (13.1) near the shell medium inlet (2) closed in the middle, and several middle baffles (13.2) and the bottom baffle (13.3) near the shell medium outlet (12) open in the middle. The top baffle (13.1) and the middle baffle (13.2) are both left with gaps from the inner wall of the shell to form an annular liquid inlet channel, and the opening between the middle baffle (13.2) and the bottom baffle (13.3) forms a vertical liquid outlet channel.

2. The high-efficiency heat exchanger with parallel vein baffles according to claim 1, characterized in that, On the normal plane along the length of the shell, the baffle (13) and the heat exchange tube (11) are arranged symmetrically on the left and right.

3. The high-efficiency heat exchanger with parallel vein baffles according to claim 2, characterized in that, Several baffles (13) are parallel to each other and evenly distributed.

4. The high-efficiency heat exchanger with parallel vein baffles according to claim 1, characterized in that, The inlet and outlet of the medium in the pipe are located on the same end of the pipe box and are coaxially opposite each other on the pipe box; the pipe box is equipped with a partition plate (7).

5. The high-efficiency heat exchanger with parallel vein baffles according to claim 1, characterized in that, The shell includes a large cylindrical body (1), a conical cylinder (3) and a small cylindrical body (4). The small cylindrical body (4) is located at both ends of the large cylindrical body (1), and the small cylindrical body (4) and the large cylindrical body (1) are connected by the conical cylinder (3).

6. The high-efficiency heat exchanger with parallel vein baffles according to claim 1, characterized in that, The tube bundle includes two tube sheets (9) on the left and right sides, multiple support plates (10) in the middle, several heat exchange tubes (11) and several baffles (13). The heat exchange tubes (11) are installed on the tube sheets (9) on the left and right sides at both ends. Several heat exchange tubes (11) pass through multiple support plates (10) perpendicular to them. The baffles (13) are installed between adjacent support plates (10).

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