Gas heat exchanger with vertical round shell and detachable square tube box

Abstract

The utility model provides a gas heat exchanger with a vertical round shell and a detachable square tube box, a shell is connected with an upper tube box and a lower tube box, finned tubes are arranged in the shell, the tube distribution range of the finned tubes is rectangular, the shell is a vertical round cylinder, the upper tube box and the lower tube box are detachable square tube boxes, an upper seal head is arranged between the upper tube box and the shell, the upper seal head and the upper tube box are welded and fixed, and the lower seal head and the lower tube box are welded and fixed. A lower sealing head is arranged between the lower tube box and the shell, a stuffing box is fixed to the lower sealing head, the lower tube box penetrates through the stuffing box and then is connected with the bottom of the finned tube, a gap between the lower tube box and the stuffing box is sealed through padding, the padding is pressed through a padding gland, and the lower tube box and the stuffing box are not fixed and are free ends; the finned tubes are supported by the supporting plates, the outer edges of the supporting plates are fixed to the inner wall of the shell, and the multiple supporting plates are in a single-bow shape, are arranged in a staggered mode and form baffling for shell pass fluid. The effect is that the lower tube box and the shell are sealed by the stuffing box, so that temperature difference stress between the heat exchange tube and the shell is prevented from acting on the tube plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchanger technical field, specifically vertical round shell pressure high, detachable square tube box gas heat exchanger. BACKGROUND

[0002] Heat exchanger is the basic equipment of realizing heat transfer process, and is very widely used in industrial production. In the construction of chemical plant, heat exchanger accounts for about 10-20% of total investment, and accounts for about 35-40% of total process equipment investment in oil refinery. Gas heat exchanger with medium as gas accounts for a certain proportion in the field of heat exchanger, especially has more application in tail gas waste heat utilization and other occasions. Process tail gas is at the end of the process, and the operating pressure is relatively low, and the control requirement of pressure drop of medium is harsh.

[0003] Generally, low finned finned tube is used as heat transfer element in general gas heat exchanger, and heat exchanger with rectangular section is used, and the pressure bearing capacity of rectangular shell is poor, and generally can only bear tens of kilopascal internal pressure. When used for higher pressure, the shell needs to be greatly strengthened, and the economy is poor. The support between heat exchange tubes adopts corrugated pad support, and the support effect is weak, the support structure is thin, and the precision control is poor.

[0004] In recent years, with the continuous growth of energy cost, the demand for low-temperature waste heat utilization technology increases, and new structure schemes of gas heat exchanger appear to adapt to the demand of various occasions. For example, in order to increase the pressure bearing capacity of the gas side, the gas side of the equipment is changed from rectangular structure to cylindrical structure, the heat exchange tubes are arranged in multiple rows perpendicular to the shell axis, and the two sides of the medium are staggered flow heat transfer. Although this scheme increases the pressure bearing capacity, in order to ensure the heat exchange area, the number of heat exchange tube rows is large, the shell side pressure drop is also increased, and the length of heat exchange tube is not the same, which increases the manufacturing difficulty. UTILITY MODEL CONTENTS

[0005] In order to solve the above problems existing in the prior art gas heat exchanger, the utility model provides a vertical round shell, detachable square tube box gas heat exchanger. The utility model has the characteristics of high air side heat transfer efficiency and low pressure drop, and has the advantages of high shell side pressure bearing, good heat exchange tube support effect, convenient heat exchange tube head maintenance and the like.

[0006] The utility model discloses a vertical round shell, detachable square tube box gas heat exchanger, shell upper portion connects upper tube box, lower portion connects lower tube box, and the finned tube is between upper tube box and lower tube box, and the finned tube distribution tube range is rectangle, and the shell is circular cylinder vertical, and upper tube box and lower tube box are all detachable square tube box, and upper tube box and shell are equipped with upper end socket, and upper end socket and upper tube box are welded and fixed, and lower tube box and shell are equipped with lower end socket, and lower end socket is fixed with packing gland, and lower tube box is connected with the bottom of finned tube after passing through packing gland, and the clearance of lower tube box and packing gland is sealed through packing, and packing gland and packing gland are connected through bolt, and lower tube box and packing gland are not fixed, and are free end, and the finned tube is supported by support plate, and the outer edge of support plate is fixed in the inner wall of shell, and support plate is single bow type, is equipped with a plurality, and is arranged staggeredly, and forms baffle for shell process fluid.

[0007] Further, the area outside the through hole of the support plate for the finned tube is provided with an overflow hole.

[0008] The preferred overflow hole is circular or rounded triangular.

[0009] Further, the finned tube base pipe and the support plate are not directly connected, but are indirectly connected through a distance box, the distance box is composed of two half boxes buckled together, the half box is composed of a hollow semicircular pipe and a semicircular ring plate, the semicircular ring plate has two, which are fixed on the upper and lower ends of the hollow semicircular pipe, and the inner circle formed by the two half boxes is clamped on the finned tube base pipe, and the butt joint of the two half boxes is welded and fixed.

[0010] Further, the upper tube box and the lower tube box are provided with rectangular detachable flat covers on the end faces, and the four sides of the rectangular detachable flat covers are rectangular flange structures.

[0011] The shell side inlet and the shell side outlet of the shell are arranged in the same direction.

[0012] The shell is fixed with a support seat on the outer wall.

[0013] The utility model discloses a positive effect for: the utility model discloses the shell side adopts the cylinder structure, and the shell side pressure bearing capacity is high, adopts the vertical arrangement, is favorable to the evaporation or condensate of the medium in the pipe, and the equipment lower tube box adopts the packing gland sealing with the shell, avoids the temperature difference stress between heat exchange pipe and shell and acts on the tube plate, and heat exchange pipe is arranged along the shell side cylinder body axial direction, adopts the finned tube, improves the heat transfer efficiency of gas side, and the medium is pure counterflow, and the shell side medium can multiple baffling, further improves the heat transfer efficiency, and the length of heat exchange pipe is not limited by the diameter of shell, and the heat exchange pipe distribution area is the rectangular structure, reduces the tube row number, is favorable to reducing the shell side pressure drop, and the distribution is many, and the upper and lower tube box is rectangular, and can be dismantled. The distance box is arranged on the finned tube, adopts the support plate support, and the distance box has a certain width, and is supported in the support plate position, and the support precision is high, and the effect is good, and effectively prevent heat exchange tube vibration, and the flow hole is set up around the distribution area on the support plate, and the shell side medium flow area is increased, and the shell side pressure drop is further reduced. The connection of tube box and rectangular detachable flat cover adopts the rectangular flange structure, and the tube box can be dismantled, and the operation difficulty of tube head welding and inspection maintenance is reduced, and the shell side entrance and shell side export are arranged on the same side, and the pipe connection difficulty of large diameter pipe is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structure schematic diagram of the utility model;

[0015] Figure 2 It is the internal structure schematic diagram of the utility model;

[0016] Figure 3 It is the structure schematic diagram of the part where packing gland is located;

[0017] Figure 4 It is the flow hole schematic diagram of the support plate of circular;

[0018] Figure 5 It is the flow hole schematic diagram of the support plate of rounded triangle;

[0019] Figure 6 It is the half box shape diagram of distance box;

[0020] Figure 7 It is the complete shape diagram of distance box;

[0021] Figure 8 It is the finned tube diagram of installing distance box;

[0022] Figure 9 It is the assembly schematic diagram of distance box on support plate.

[0023] In the figure: 1 - upper tube box pipe head, 2 - upper tube box, 3 - shell, 4 - shell side inlet, 5 - support seat, 6 - shell side outlet, 7 - lower head, 8 - lower tube box, 9 - lower tube box pipe head, 10 - upper head, 11 - finned tube, 12 - support plate, 13 - bolt, 14 - packing gland, 15 - packing box, 16 - packing, 17 - distance box, 18 - flow hole. DETAILED DESCRIPTION

[0024] As shown in the figure, a vertical round shell, detachable square tube box gas heat exchanger, the support seat 5 is fixed on the outer wall of the shell 3, the upper tube box 2 is connected to the upper part of the shell 3, and the lower tube box 8 is connected to the lower part of the shell 3. The finned tube 11 is between the upper tube box 2 and the lower tube box 8, the finned tube 11 is arranged in a rectangular range, and the finned tube 11 serves as a heat transfer element to form a heat transfer tube bundle. The shell 3 is a vertical circular cylinder, the upper tube box 2 and the lower tube box 8 are both detachable square tube boxes. The upper head 10 is arranged between the upper tube box 2 and the shell 3, and the upper head 10 is welded and fixed with the upper tube box 2. The lower head 7 is arranged between the lower tube box 8 and the shell 3, and the lower head 7 is fixed with the packing box 15. The lower tube box 8 is connected with the bottom of the finned tube 11 after passing through the packing box 15, and the gap between the lower tube box 8 and the packing box 15 is sealed by the packing 16. The packing 16 is compressed by the packing gland 14, and the packing gland 14 is connected with the packing box 15 by the bolt 13. The lower tube box 8 and the packing box 15 are not fixed, and are free ends. The finned tube 11 is supported by the support plate 12. The outer edge of the support plate 12 is fixed on the inner wall of the shell 3. The support plate 12 is single-arched, is provided with a plurality of support plates, is arranged staggered, and forms a baffle for the shell side fluid.

[0025] The flow hole 18 is arranged around the through hole 19 through which the finned tube 11 passes.

[0026] The shape of the flow hole 18 can be circular or rounded triangular, as shown in Figure 4 , 5 The flow hole 18 functions to increase the flow area of the shell side and reduce the pressure drop of the shell side fluid.

[0027] The base pipe of the finned tube 11 is not directly connected with the support plate 12, but is indirectly connected through the distance box 17. The support plate 12 supports the distance box 17, and the distance box 17 supports the base pipe. The distance box 17 separates and arranges the fins on the finned tube 11 at a certain distance, and the outer diameter of the distance box 17 is slightly larger than the outer diameter of the finned tube. The distance box 17 is composed of two half boxes buckled together. The half box is composed of a hollow semicircular pipe and a semicircular ring plate. The semicircular ring plate has two, which are respectively fixed on the upper and lower ends of the hollow semicircular pipe. The inner circle formed by the two half boxes is clamped on the base pipe of the finned tube, and the butt joint of the two half boxes is welded and fixed.

[0028] The upper tube box 2 and the lower tube box 8 are provided with rectangular detachable flat covers, and the four edges of the rectangular detachable flat covers are rectangular flange structures. The rectangular detachable flat covers facilitate the welding operation of the upper tube box pipe head 1, facilitate the inspection and maintenance during use, and facilitate the installation and disassembly of the rectangular packing gland.

[0029] The shell side inlet 4 and the shell side outlet 6 of the shell 3 are coaxially arranged, facilitating the pipe connection operation of the large-diameter pipe.

Claims

1. A vertical round shell, detachable square tube box gas heat exchanger, the upper part of the shell (3) is connected with the upper tube box (2), the lower part is connected with the lower tube box (8), the upper tube box (2) and the lower tube box (8) are finned tubes (11), the tube arrangement range of the finned tubes (11) is rectangular, the shell (3) is a vertical round cylinder, the upper tube box (2) and the lower tube box (8) are both detachable square tube boxes, characterized in that: An upper tube box (2) and a shell (3) are provided with an upper head (10), the upper head (10) is welded and fixed with the upper tube box (2), a lower tube box (8) and the shell (3) are provided with a lower head (7), the lower head (7) is fixed with a packing box (15), the lower tube box (8) is connected with the bottom of a finned tube (11) after penetrating through the packing box (15), the gap between the lower tube box (8) and the packing box (15) is sealed by packing (16), the packing (16) is compressed by a packing gland (14), the packing gland (14) and the packing box (15) are connected by a bolt (13), the lower tube box (8) and the packing box (15) are not fixed, and are free ends; the finned tube (11) is supported by a support plate (12), the outer edge of the support plate (12) is fixed on the inner wall of the shell (3), the support plate (12) is single-arched, a plurality of support plates (12) are arranged staggeredly, and the support plates (12) form baffles for the shell-side fluid. ​ 2. A vertical cylindrical, removable square box gas heat exchanger according to claim 1, characterized in that: An area outside a through hole (19) through which the finned tube (11) penetrates of the support plate (12) is provided with an overflow hole (18).

3. A vertical cylindrical, removable square box gas heat exchanger according to claim 2, characterized in that: The overflow hole (18) is circular or inversely rounded triangular.

4. A vertical cylindrical, removable square box gas heat exchanger according to claim 1, characterized in that: The base pipe of the finned tube (11) is not directly connected with the support plate (12), but is indirectly connected through a distance box (17), the distance box (17) is composed of two half boxes buckled together, the half box is composed of a hollow semicircular pipe and a semicircular ring plate, the semicircular ring plate has two and is fixed on the upper and lower ends of the hollow semicircular pipe, the inner circle formed by the two half boxes is clamped on the base pipe of the finned tube, and the butt joint of the two half boxes is welded and fixed.

5. A vertical cylindrical, removable square box gas heat exchanger according to claim 1, characterized in that: The end faces of the upper tube box (2) and the lower tube box (8) are provided with rectangular detachable covers, and the four edges of the rectangular detachable covers are rectangular flange structures.

6. A vertical cylindrical, removable square box gas heat exchanger according to claim 1, characterized in that: The shell-side inlet (4) and the shell-side outlet (6) of the shell (3) are arranged in the same direction.

7. A vertical cylindrical, removable square box gas heat exchanger according to claim 1, characterized in that: The outer wall of the shell (3) is fixed with a support seat (5).

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