Tubular heat exchanger

Abstract

The utility model belongs to the technical field of heat exchangers, and relates to a shell-and-tube heat exchanger, which comprises a left seal head, a barrel and a right seal head, a left cavity is arranged in the left seal head, a right cavity is arranged in the right seal head, a tube pass inlet is arranged on the left seal head, a tube pass outlet is arranged on the right seal head, and a shell pass inlet and a shell pass outlet are respectively arranged on the barrel. The shell pass inlet is close to the tube pass outlet, and the shell pass outlet is close to the tube pass inlet. A heat exchange tube bundle, a left tube plate, a right tube plate, an upper baffle plate and a lower baffle plate are respectively arranged in the cylinder body, the left end of the left baffle plate is hermetically connected with the left tube plate, a right overflowing port is arranged between the right end of the left baffle plate and the right tube plate, the right end of the right baffle plate is hermetically connected with the right tube plate, and a left overflowing port is arranged between the left end of the right baffle plate and the left tube plate. A left baffle is arranged in the left end socket to divide the left cavity into a left upper cavity and a left lower cavity, and a right baffle is arranged in the right end socket to divide the right cavity into a right upper cavity and a right lower cavity. According to the utility model, not only is scaling reduced, but also the shell pass is convenient to clean.

Description

Technical Field

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

[0002] In the corn starch glucose syrup production process, shell-and-tube heat exchangers are widely used to preheat the starch emulsion before primary injection. This type of heat exchanger features a fixed tubesheet structure, with the shell-side baffles and tube bundles perpendicular to each other. During this preheating process, the starch emulsion serves as the cooling source in the tube side, while the liquefied liquid (or other heat source) serves as the heat source in the shell side.

[0003] In the actual production of starch milk preheating, the main disadvantages of this structure of shell and tube heat exchanger are as follows:

[0004] 1. Scaling problem: When the heat source temperature is too high and the temperature difference between the cold and hot sources is large, the gelatinization rate of the starch milk will be accelerated, resulting in the formation of scale on the inner wall of the tube, thereby reducing the overall heat transfer coefficient of the heat exchanger and increasing the cleaning frequency of the tube;

[0005] 2. Shell-side cleaning issues: Because the tube sheets at both ends of the tube bundle are welded to the shell, shell-side cleaning is very inconvenient. In addition, the baffles, which are perpendicular to the tube bundle, have many dead corners, which are prone to dirt accumulation, thereby reducing the overall heat transfer coefficient of the heat exchanger. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a shell and tube heat exchanger which not only reduces the occurrence of scaling but also facilitates cleaning of the shell side.

[0007] The utility model is implemented as follows: a shell-and-tube heat exchanger is provided, comprising a left head, a cylinder, and a right head, which are sealed and connected in sequence. A left cavity is provided in the left head, a right cavity is provided in the right head, a tube-side inlet is provided on the left head, a tube-side outlet is provided on the right head, and a shell-side inlet and a shell-side outlet are provided on the cylinder, respectively, with the shell-side inlet being adjacent to the tube-side outlet, and the shell-side outlet being adjacent to the tube-side inlet. A heat exchange tube bundle, a left tube sheet, a right tube sheet, an upper baffle, and a lower baffle are provided in the cylinder, respectively. The ends of the heat exchange tube bundle pass through the left tube sheet and the right tube sheet, respectively, and are sealed and connected to the left tube sheet and the right tube sheet, respectively, so that the heat exchange tube bundle communicates with the left cavity and the right cavity, respectively. The left end of the left baffle is sealed and connected to the left tube sheet, and a right flow outlet is provided between its right end and the right tube sheet. The right end of the right baffle is sealed and connected to the right tube sheet, and a left flow outlet is provided between its left end and the left tube sheet. A left baffle is provided in the left head to separate the left cavity into a left upper cavity and a left lower cavity, and a right baffle is provided in the right head to separate the right cavity into a right upper cavity and a right lower cavity.

[0008] Furthermore, multiple groups of connecting components are arranged between the upper baffle and the lower baffle, and each group of connecting components includes a connecting rod and a positioning tube. One end of the connecting rod is connected to the upper baffle, and the other end is connected to the lower baffle. The positioning tube is sleeved on the outside of the connecting rod and is located between the upper baffle and the lower baffle.

[0009] Furthermore, the heat exchange tube bundle includes a plurality of heat exchange tube rows spaced apart from each other, and each heat exchange tube row includes a plurality of heat exchange tubes spaced apart from each other.

[0010] Compared with the prior art, the shell and tube heat exchanger of the present invention has the following characteristics:

[0011] 1. Reduce tube side scaling: The tube side and the shell side are heat exchanged in a gradual manner, making the temperature difference between the tube side and the shell side more uniform throughout the heat exchange process, reducing the scaling phenomenon in the shell side caused by excessive local temperature difference;

[0012] 2. Easy to clean the shell side: The upper baffle and lower baffle parallel to the heating tube row are set, which not only reduces the dead corners of shell side scaling, but also makes shell side cleaning more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a full cross-sectional schematic diagram of a preferred embodiment of the present utility model;

[0014] Figure 2 for Figure 1 A magnified schematic diagram of the middle part A;

[0015] Figure 3 for Figure 1 Schematic cross-section of the middle MM. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] Please also refer to Figure 1 、 Figure 2 as well as Figure 3 As shown, a preferred embodiment of the shell and tube heat exchanger of the present invention comprises a left head 1, a cylinder 2 and a right head 3 which are sealed and connected in sequence.

[0018] A left cavity 11 is provided in the left head 1, and a right cavity 31 is provided in the right head 3. A tube-side inlet 4 is provided on the left head 1, a tube-side outlet 5 is provided on the right head 3, and a shell-side inlet 6 and a shell-side outlet 7 are provided on the cylinder 2, respectively. The shell-side inlet 6 is close to the tube-side outlet 5, and the shell-side outlet 7 is close to the tube-side inlet 4.

[0019] The cold source flows in the tube side, and the heat source flows in the shell side. The shell side inlet 6 is close to the tube side outlet 5, and the shell side outlet 7 is close to the tube side inlet 4, so that the tube side and the shell side can exchange heat in a step-by-step manner, making the heat exchange temperature difference between the tube side and the shell side more uniform in the entire heat exchange process, reducing the scaling phenomenon in the shell side due to excessive local temperature difference.

[0020] A heat exchange tube bundle 8, a left tube sheet 21, a right tube sheet 22, an upper baffle 23 and a lower baffle 24 are respectively arranged in the cylinder 2. The two ends of the heat exchange tube bundle 8 pass through the left tube sheet 21 and the right tube sheet 22 respectively and are sealed with the left tube sheet 21 and the right tube sheet 22 respectively. The heat exchange tube bundle is connected to the left cavity 11 and the right cavity 31 respectively.

[0021] The left end of the upper baffle 23 is sealed with the left tube sheet 21, and a right flow opening 25 is provided between its right end and the right tube sheet 22. The right end of the lower baffle 24 is sealed with the right tube sheet 22, and a left flow opening 26 is provided between its left end and the left tube sheet 21. The upper baffle 23 and the lower baffle 24 are arranged along the tube side, dividing the internal space of the cylinder 2 (i.e., the shell side) into three regions: upper, middle, and lower. The heat exchange tube bundle 8 is distributed within these three regions, so that the cylinder 2 contains three shell sides and the heat exchange tube bundle 8 is divided into three tube sides. In addition, the upper baffle 23 and the lower baffle 24, arranged parallel to the heat exchange tube bundle 8, not only reduce dead corners that can cause scaling in the shell side, but also facilitate shell side cleaning.

[0022] A left baffle 12 is provided in the left end cap 1 to separate the left cavity 11 into a left upper cavity 13 and a left lower cavity 14. A right baffle 32 is provided in the right end cap 3 to separate the right cavity 31 into a right upper cavity 33 and a right lower cavity 34.

[0023] A plurality of connecting assemblies 9 are provided between the upper baffle 23 and the lower baffle 24. Each connecting assembly 9 comprises a connecting rod 91 and a positioning tube 92. One end of the connecting rod 91 is connected to the upper baffle 23, and the other end is connected to the lower baffle 24. The positioning tube 92 is sleeved on the outside of the connecting rod 91 and is located between the upper baffle 23 and the lower baffle 24.

[0024] The upper baffle 23 is located at the same height as the left baffle 12, and the lower baffle 24 is located at the same height as the right baffle 32. The upper and lower baffles 23 and 24, the right and left flow ports 25 and 26, and the left and right tube sheets 21 and 22 collectively divide the cylinder 1 into three shell passes. The left and right baffles 12 and 32, the upper left and lower left cavities 13 and 14, and the upper right and lower right cavities 33 and 34 collectively divide the heat exchange tube bundle 8 into three tube passes.

[0025] The heat exchange tube bundle 8 includes a plurality of heat exchange tube rows 81 spaced apart from each other, and each heat exchange tube row 81 includes a plurality of heat exchange tubes 82 spaced apart from each other.

[0026] The cold source enters the upper left cavity 13 from the tube pass inlet 4, flows through the first tube pass and enters the upper right cavity 33. Then it flows through the second tube pass and enters the lower left cavity 14, flows through the third tube pass and enters the lower right cavity 34, and finally flows out of the cylinder 2 from the tube pass outlet 5.

[0027] The heat source enters the first shell side below the lower baffle 24 from the shell side inlet 6, flows through the heat exchange tube bundle 8 in the first shell side, and after heat exchange, passes through the left flow port 26 and enters the second shell side between the upper baffle 23 and the lower baffle 24. It then flows through the heat exchange tube bundle 8 in the second shell side, and then flows through the right flow port 25 into the third shell side above the upper baffle 23. Finally, it flows through the heat exchange tube bundle 8 in the second shell side and is discharged from the cylinder 2 through the shell side outlet 7.

[0028] During the flow of the cold source, it is gradually heated by the heat source in the shell side. The cold source exchanges heat in a step-by-step manner, so that the heat exchange temperature difference between the tube side and the shell side is uniform throughout the heat exchange process, reducing the scaling phenomenon in the shell side due to excessive local temperature difference.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A shell and tube heat exchanger, comprising a left head, a cylinder and a right head which are sealed and connected in sequence, a left cavity being provided in the left head and a right cavity being provided in the right head, characterized in that: A tube-side inlet is provided on the left head, a tube-side outlet is provided on the right head, and a shell-side inlet and a shell-side outlet are provided on the cylinder, with the shell-side inlet close to the tube-side outlet and the shell-side outlet close to the tube-side inlet; A heat exchange tube bundle, a left tube sheet, a right tube sheet, an upper baffle and a lower baffle are respectively arranged in the cylinder. The two ends of the heat exchange tube bundle pass through the left tube sheet and the right tube sheet respectively and are sealed with the left tube sheet and the right tube sheet respectively. The heat exchange tube bundle is connected to the left cavity and the right cavity respectively; the left end of the left baffle is sealed with the left tube sheet, and a right flow outlet is arranged between its right end and the right tube sheet; the right end of the right baffle is sealed with the right tube sheet, and a left flow outlet is arranged between its left end and the left tube sheet; a left baffle is arranged in the left head to separate the left cavity into a left upper cavity and a left lower cavity, and a right baffle is arranged in the right head to separate the right cavity into a right upper cavity and a right lower cavity.

2. The shell and tube heat exchanger according to claim 1, characterized in that: Multiple groups of connecting components are arranged between the upper baffle and the lower baffle, and each group of connecting components includes a connecting rod and a positioning tube. One end of the connecting rod is connected to the upper baffle, and the other end is connected to the lower baffle. The positioning tube is sleeved on the outside of the connecting rod and is located between the upper baffle and the lower baffle.

3. The shell and tube heat exchanger according to claim 1, characterized in that: The heat exchange tube bundle includes a plurality of heat exchange tube rows spaced apart from each other, and each heat exchange tube row includes a plurality of heat exchange tubes spaced apart from each other.

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