Tube head anti-scour protection structure of vertical tubular heat exchanger

Abstract

An anti-scour protection structure for a tube head of a vertical tubular heat exchanger comprises a shell and a tube plate fixedly connected to the end of the shell, a heat exchange tube is installed on the tube plate, and the anti-scour protection structure for the tube head is detachably installed above the tube plate and comprises a connecting plate, a connecting tube and a pipe spacer; one end of the connecting pipe is fixedly connected with the upper end face of the connecting plate in a penetrating mode, and the other end of the connecting pipe is inserted into the heat exchange pipe. On one hand, abrasion and impact of axial fluid at the inlet of the tube box on the tube head can be prevented, on the other hand, secondary distribution can be carried out on the fluid at the inlet of the tube box, and uniform distribution of the fluid in the tube box is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchanger tube anti-impact, and relates to a vertical tube heat exchanger tube head anti-impact protection structure. Background Art

[0002] Heat exchangers are common equipment in chemical, petroleum, power, food and many other industrial sectors, and they occupy an important position in production. As a key auxiliary component of heat exchangers, anti-collision plates play a very important role in heat exchangers. Since the shell-side medium is usually a corrosive gas or a liquid with a high flow rate, if an anti-collision plate is not installed near the shell-side inlet for protection, the gas will directly impact the heat exchange tube, which will not only corrode the heat exchange tube but also cause the heat exchange tube to vibrate strongly, affecting the life of the heat exchanger. Therefore, most of the anti-collision plates in the prior art are fixed at the shell-side connecting pipe. There is no pipe box anti-collision structure in the literature. In actual production, a baffle is simply set at the pipe box, and no holes are opened on the baffle. Although this pipe box anti-collision structure has a certain anti-collision function, some fluids will still bypass the baffle to cause erosion on the tube sheet and the tube head, thereby causing the tube head to fail.

[0003] When the fluid enters the heat exchanger tube box inlet axially and is a two-phase or three-phase flow, it is usually necessary to set a tube side anti-collision structure at the tube side inlet. Utility Model Content

[0004] The utility model aims to provide an anti-collision protection structure for the inlet pipe head of a tube side of a vertical tube heat exchanger, which can realize the complete anti-collision of the pipe head and the uniform distribution of the fluid in the inlet pipe box, and the inlet pipe box and the pipe head anti-collision protection structure are detachable, and the pipe head connecting the tube sheet and the heat exchange tube can be inspected.

[0005] The technical solution adopted by this utility model:

[0006] A tube head anti-impact protection structure for a vertical tube heat exchanger comprises a shell and a tube sheet fixed at its end, a heat exchange tube is mounted on the tube sheet, a tube head anti-impact protection structure is detachably mounted above the tube sheet, the tube head anti-impact protection structure comprises a connecting plate, a connecting tube and a distance tube; one end of the connecting tube is fixedly connected to the upper end surface of the connecting plate, and the other end is inserted into the heat exchange tube, and the distance tube is arranged between the connecting plate and the tube sheet.

[0007] The number of the connecting tubes corresponds to the number of the heat exchange tubes. The wall thickness of the connecting tubes is 1 mm, and the outer diameter thereof is 0.5-1 mm smaller than the inner diameter of the heat exchange tubes. The connecting tubes are inserted into the heat exchange tubes to a depth of about 30-40 mm.

[0008] The connecting pipe is made of wear-resistant high-strength stainless steel.

[0009] The distance tube has a length of 30-40 mm.

[0010] The upper end of the tube sheet is provided with a tube box and tube sheet connecting section and an inlet connecting section in sequence; the tube box and tube sheet connecting section and the inlet connecting section are connected by flanges in a detachable manner.

[0011] The utility model realizes the complete anti-collision of the pipe head and also realizes the uniform distribution of the fluid in the inlet pipe box. The anti-collision protection structure of the inlet pipe box and the pipe head is detachable, and the pipe head connecting the tube sheet and the heat exchange pipe can be inspected. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall connection structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the component connection structure of the utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the utility model connected to the tube sheet;

[0015] Figure 4 This is a schematic diagram of the structure of the utility model connected with the heat exchange tube;

[0016] Figure 5 This is a schematic diagram of the structure of the connecting plate of the utility model;

[0017] Numbers in the figure:

[0018] Pipe box inlet 1, inlet connecting section 2, pipe box flange 3, pipe box corresponding flange 4, pipe box and tube sheet connecting section 5, tube sheet 6, shell 7, tube head anti-impact protection structure 8, heat exchange tube 9, connecting plate 10, connecting pipe 11, fastening bolts 12, nuts 13, distance pipe 14, connecting pipe hole 15, bolt connecting hole 16. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0020] See also Figure 1 , 2 , 3, 4, 5, a tube head anti-impact protection structure of a vertical tube heat exchanger, comprising a shell 7 and a tube sheet 6 fixed at its end, a heat exchange tube 9 mounted on the tube sheet 6, a tube head anti-impact protection structure 8 is detachably mounted above the tube sheet 6, the tube head anti-impact protection structure 8 comprises a connecting plate 10, a connecting tube 11 and a distance tube 14; one end of the connecting tube 11 is fixedly connected to the upper end surface of the connecting plate 10, and the other end is inserted into the heat exchange tube 9, and the distance tube 14 is arranged between the connecting plate 10 and the tube sheet 6.

[0021] The connecting plate 10 is provided with a connecting pipe hole 15 and a bolt connection hole 16. The connecting pipe hole 15 is used for welding the connecting pipe 11 and the connecting plate 10, and the bolt connection hole 16 is used for fastening the connection between the bolt 12 and the tube plate 6. The above structure solves the problem of connecting and fixing the connecting pipe 11 and the connecting plate 10.

[0022] The number of the connecting tubes 11 corresponds to the number of the heat exchange tubes 9, that is, each heat exchange tube has a corresponding connecting tube, which ensures the uniformity of the tube-side fluid entering the heat exchange tube.

[0023] The wall thickness of the connecting pipe 11 is 1 mm, which ensures that the connecting pipe 11 has sufficient strength and wear resistance while reducing the resistance drop of the pipe-side fluid passing through the connecting pipe 11 as much as possible.

[0024] The outer diameter of the connecting tube 11 is 0.5-1 mm smaller than the inner diameter of the heat exchange tube, so as to ensure the connectability of the connecting tube 11 and the heat exchange tube 9 .

[0025] The connecting pipe 11 is inserted into the heat exchange tube 9 to a depth of about 30-40 mm. The smaller inner extension length of the heat exchange tube reduces the resistance drop along the tube side fluid in the connecting pipe and reduces the difficulty of installing the tube head anti-impact protection structure 8.

[0026] The connecting pipe 11 is made of wear-resistant high-strength stainless steel. When the temperature of the fluid in the pipe side is low, such as below 300°C, SS2205 can be used; when the temperature of the fluid in the pipe side is high, such as above 300°C, SS310 can be used.

[0027] The length of the distance pipe is about 30-40 mm. A smaller distance pipe length corresponds to a smaller connecting pipe 11 length, which not only reduces the resistance drop along the pipe path of the connecting pipe, but also reduces the difficulty of installing the pipe head anti-impact protection structure 8.

[0028] Corresponding threaded holes are formed on the tube sheet 6 at the connection position with the fastening bolts 12, so as to connect the fastening bolts 12 and fix the pipe head anti-impact protection structure 8.

[0029] The upper end of the tube sheet 6 is provided with a tube box and tube sheet connection section 5 and an inlet connection section 2 in sequence; the flange between the tube box and tube sheet connection section 5 and the inlet connection section 2 is detachably connected. One end of the inlet connection section 2 is a tube box flange 3, and one end of the tube box and tube sheet connection section 5 is a tube box corresponding flange 4. When inspecting the pipe head anti-impact protection structure 8, the tube box flange 3 can be disassembled; when inspecting the pipe head connecting the heat exchange tube 9 and the tube sheet 6, while disassembling the tube box flange 3, the fastening bolts 12 and nuts 13 are disassembled, and the pipe head anti-impact protection structure 8 can be removed.

Claims

1. A vertical tube heat exchanger tube head anti-impact protection structure, comprising a shell and a tube sheet fixed at its end, and a heat exchange tube installed on the tube sheet, characterized in that: A tube head anti-impact protection structure (8) is detachably mounted above the tube sheet (6), the tube head anti-impact protection structure (8) comprising a connecting plate (10), a connecting tube (11) and a distance tube (14); one end of the connecting tube (11) is connected and fixedly connected to the upper end surface of the connecting plate (10), and the other end is inserted into the heat exchange tube (9); the distance tube (14) is arranged between the connecting plate (10) and the tube sheet (6).

2. The anti-impact protection structure for a tube head of a vertical tube heat exchanger according to claim 1, characterized in that: The number of the connecting tubes (11) corresponds to the number of the heat exchange tubes (9); the wall thickness of the connecting tubes (11) is 1 mm, and the outer diameter thereof is 0.5 to 1 mm smaller than the inner diameter of the heat exchange tubes; and the connecting tubes (11) are inserted into the heat exchange tubes (9) to a depth of about 30 to 40 mm.

3. The anti-impact protection structure for a tube head of a vertical tube heat exchanger according to claim 2, characterized in that: The connecting pipe (11) is made of wear-resistant high-strength stainless steel.

4. The anti-impact protection structure for a tube head of a vertical tube heat exchanger according to claim 1, characterized in that: The distance tube (14) has a length of 30-40 mm.

5. A vertical tube heat exchanger tube head anti-impact protection structure according to any one of claims 1 to 4, characterized in that: The upper end of the tube sheet (6) is provided with a tube box and tube sheet connecting section (5) and an inlet connecting section (2) in sequence; the tube box and tube sheet connecting section (5) and the inlet connecting section (2) are detachably connected by flanges.

Images