CN103954153A - Multipath pure countercurrent shell-and-tube type heat exchanger - Google Patents

Abstract

The invention discloses a multipath pure countercurrent shell-and-tube type heat exchanger, belongs to heat exchange equipment, and particularly discloses a heat exchanger for liquids with low temperature difference, high temperature rise and zero phase change. The multipath pure countercurrent shell-and-tube type heat exchanger comprises a front tube box, a rear tube box and a shell pass, wherein the shell pass is composed of a flow guiding inlet/outlet end out of the shell side, a front tube sheet, a rear tube sheet, a pass partition plate, a heat exchange tube bundle, a baffling rod group and a sectioning shell; the flow guiding inlet/outlet end out of the shell side is composed of a outer flow guide cylinder and an inner flow guide cylinder which are respectively provided with a shell pass inlet and a shell pass outlet; the heat exchange tube bundle penetrates through the baffling rod group, the front tube plate and the rear tube plate; two ends of the heat exchange tube bundle are respectively welded or in expansion connection with the front tube plate and the rear tube plate, and the middle of the heat exchange tube bundle is supported by the baffling rod group; the pass partition plate in the middle is welded and connected with the front tube plate, the outer flow guide cylinder, the inner flow guide cylinder and the sectioning shell. The multipath pure countercurrent shell-and-tube type heat exchanger can realize single heat exchanger multipath pure countercurrent design, is resistant against high temperature and high pressure, good in heat transfer effect, low in running resistance, compact in structure, free from impact to the tube bundle, and the like.

Description

Multi-process pure countercurrent shell and tube heat exchanger

technical field

The invention belongs to heat exchange equipment, in particular to a multi-flow pure countercurrent shell-and-tube heat exchanger used for heat exchange between liquids with low temperature difference, large temperature rise, and no phase change.

Background technique

The heat exchange between liquids with low temperature difference, large temperature rise and no phase change is mainly used in pressure-isolated heat exchange equipment of district heating systems with large height differences and drain coolers in power plants. The temperature difference is generally only 5°C to 10°C. Good, and the high pressure of the equipment is generally 2.5-4.5MPa, which is unbearable for the plate heat exchanger, and it must be realized by pure counterflow. The heat exchange equipment currently used is mainly the traditional shell and tube type, fixed tube Multiple plate heat exchangers are connected in series to meet the temperature difference requirements or a single plate heat exchanger is realized at a low flow rate with extremely poor heat transfer, which requires sacrificing a very large heat transfer area. The single multi-process pure countercurrent structure is difficult to realize with the traditional shell-and-tube heat exchanger structure due to the shell-side multi-process. For this reason, those skilled in the art have been devoting themselves to designing a high-efficiency heat exchanger that can solve the problem of realizing shell-side multi-flow pure countercurrent heat exchange, but so far, there has been no new breakthrough

Contents of the invention

In order to solve the problem that there is no high-efficiency heat exchanger with good shell-side multi-process pure countercurrent heat exchange effect, the purpose of the present invention is to provide a multi-process pure countercurrent shell-and-tube heat exchanger, the multi-process pure countercurrent shell-and-tube heat exchanger The heat exchanger not only realizes the multi-process pure counterflow design of the single heat exchanger, but also has the characteristics of high temperature and high pressure resistance, good heat transfer effect, small running resistance, compact structure, and no impact on the tube bundle.

The technical solution adopted by the present invention to solve the technical problem is: a multi-flow pure countercurrent shell-and-tube heat exchanger, including a front-end tube box, a rear-end tube box, and a shell side. It is composed of inlet and outlet, front tube sheet, rear tube sheet, split-pass partition, heat exchange tube bundle, baffle rod group, split shell,

The shell-side external diversion inlet and outlet are composed of an outer diversion cylinder and an inner diversion cylinder equipped with a shell-side inlet and a shell-side outlet. The front end of the outer diversion cylinder is welded to the front tube plate, and the rear end is connected to the The split shell is welded and connected, the front end of the inner guide tube is empty, and the rear end is connected to the front end of the split shell.

The heat exchange tube bundle passes through the baffle rod group, the front tube sheet and the rear tube sheet, and the two ends of the heat exchange tube bundle are respectively welded or expanded to the front tube sheet and the rear tube sheet, and the middle is supported by the baffle rod group;

The middle splitter is welded to the front tube plate, the outer guide tube, the inner guide tube, and the split shell, the center plate of the middle splitter is welded to the rear tube plate, and the front tube with the inlet and outlet of the tube pass The box is provided with a front-end splitter corresponding to the middle splitter, and the rear pipe box is provided with a rear splitter corresponding to the center plate of the middle splitter.

The intermediate split-pass partition near the shell-side outlet and the outer guide tube and the inner guide tube form a semi-circular outlet guide chamber, and the intermediate split-pass partition near the shell-side inlet and the outer guide tube The tube and the inner guide tube form a semicircular inlet guide cavity.

The split shell has at least two petals, and is welded with the middle partition to form a circular cylinder.

The intermediate partitions are parallel to each other, and the number of processes is at least 2.

The beneficial effects of the present invention are: due to the multi-process pure countercurrent design, the heat exchange effect is good, and the heat exchange can be realized at low temperature difference and high temperature rise; due to the use of the traditional heat exchanger form of the circular shell, it has high temperature and high pressure resistance and convenient maintenance The characteristics of the plate heat exchanger are not available; because the shell-side tube bundle support adopts the baffle rod support structure, it has the characteristics of good heat exchange effect and low fluid resistance; because the shell-side inlet and outlet adopts the external flow guide buffer structure, It not only avoids the direct impact of the fluid on the tube bundle, increases the flow area of the inlet, greatly reduces the flow rate of the liquid inlet and outlet, but also flows the fluid back to the end of the tube bundle into the tube bundle so that there is no dead zone in the heat exchange of the tube bundle; due to the use of the shell side The structural form of the shell split shell is not less than two petals, so that the more complicated shell-side multi-process structure can be realized relatively simply by buckling the split shell in the case of unrealizable shell assembly, so that Realize the multi-process design and manufacture of the shell side, and divide the circular shell into multiple processes with the intermediate partition plate on the shell side; the structure of the equipment is simple, the manufacture is convenient, and it is an efficient energy-saving heat exchange equipment.

Description of drawings

Fig. 1 is the front view of the multi-flow pure inverse shell-and-tube heat exchanger of the present invention.

Fig. 2 is the A-A view of Fig. 1 .

Fig. 3 is a B-B view of Fig. 1 .

In the figure: 1. Front tube box, 2. Tube side outlet, 3. Front tube plate, 4. Outer diversion cylinder, 5. Shell side inlet, 6. Inlet diversion chamber, 7. Inner diversion cylinder, 8. Heat exchange tube bundle, 9. Baffle rod group, 10. Middle splitter, 11. Center plate of middle splitter, 12. Rear tube plate, 13. Rear tube box, 14. Front splitter , 15. Rear splitter, 16. Split shell, 17. Outlet guide cavity, 18. Shell side outlet, 19. Tube side inlet.

Detailed ways

The specific embodiment of the present invention is, as shown in the figure:

Embodiment 1, a multi-flow pure countercurrent shell-and-tube heat exchanger, including a front-end tube box 1, a rear-end tube box 13, and a shell side. Plate 3, rear tube plate 12, split-pass partition, heat exchange tube bundle 8, baffle rod group 9, split shell 16,

The shell-side external diversion inlet and outlet end is composed of an outer diversion cylinder 4 and an inner diversion cylinder 7 equipped with a shell-side inlet 5 and a shell-side outlet 18, and the front end of the outer diversion cylinder is welded to the front tube plate , the rear end is welded to the split shell, the front end of the inner guide tube is empty, and the rear end is connected to the front end of the split shell,

The heat exchange tube bundle passes through the baffle rod group, the front tube sheet and the rear tube sheet, and the two ends of the heat exchange tube bundle are respectively welded or expanded to the front tube sheet and the rear tube sheet, and the middle is supported by the baffle rod group;

The middle splitter is welded to the front tube plate, the outer guide tube, the inner guide tube, and the split shell, the center plate of the middle splitter is welded to the rear tube plate, and the front tube with the inlet and outlet of the tube pass The box is provided with a front end splitter 14 corresponding to the middle splitter, and a rear splitter 15 corresponding to the center board of the middle splitter is provided in the rear pipe box.

Embodiment 2, a multi-flow pure countercurrent shell-and-tube heat exchanger, including a front-end tube box 1, a rear-end tube box 13, and a shell side. Plate 3, rear tube plate 12, split-pass partition, heat exchange tube bundle 8, baffle rod group 9, split shell 16,

The shell-side external diversion inlet and outlet end is composed of an outer diversion cylinder 4 and an inner diversion cylinder 7 equipped with a shell-side inlet 5 and a shell-side outlet 18, and the front end of the outer diversion cylinder is welded to the front tube plate , the rear end is welded to the split shell, the front end of the inner guide tube is empty, and the rear end is connected to the front end of the split shell,

The heat exchange tube bundle passes through the baffle rod group, the front tube sheet and the rear tube sheet, and the two ends of the heat exchange tube bundle are respectively welded or expanded to the front tube sheet and the rear tube sheet, and the middle is supported by the baffle rod group;

The middle splitter is welded to the front tube plate, the outer guide tube, the inner guide tube, and the split shell, the center plate of the middle splitter is welded to the rear tube plate, and the tube inlet 19 and tube side are provided. The front pipe box of the outlet 2 is provided with a front end dividing plate 14 corresponding to the middle dividing plate, and a rear dividing plate 15 corresponding to the center plate of the middle dividing plate is arranged in the rear pipe box.

The intermediate split-pass partition near the shell-side outlet and the outer guide tube and the inner guide tube form a semi-circular outlet guide chamber 17, and the intermediate split-pass partition near the shell-side inlet and the outer guide tube The flow tube and the inner guide tube form a semicircular inlet guide cavity 6 .

The split shell has 2 petals, and is welded with the intermediate partition to form a circular cylinder.

The intermediate dividers are parallel to each other, and the number of processes is 2.

Claims (4)

1. the pure reverse stream pipe shell heat exchanger of multipaths, comprises front-end pipe box, rear end header, shell side, it is characterized in that: shell side is made up of the outer water conservancy diversion entrance end of shell-side, front tube sheet, back tube sheet, pass partition, heat-exchanging tube bundle, rod baffle group, distinguish housing,

The outer water conservancy diversion entrance end of described shell-side is made up of external flow guiding cylinder body and inner draft tube body that shell side import and shell side outlet are housed, external flow guiding cylinder front end and front tube sheet are welded to connect, and rear end and distinguish housing are welded to connect, and inner draft tube front end is vacant, rear end is connected to distinguish housing front end

Heat-exchanging tube bundle is through rod baffle group and front tube sheet, back tube sheet, and heat-exchanging tube bundle two ends are connected with front tube sheet, back tube sheet welding or expanded joint respectively, and centre is supported by rod baffle group;

Middle pass partition and front tube sheet and external flow guiding cylinder, inner draft tube, distinguish housing are welded to connect, middle pass partition central plate and back tube sheet are welded to connect, be provided with tube side import and export front header in be provided with the front end pass partition corresponding with middle pass partition, in rear header, be provided with the rear end pass partition corresponding with middle pass partition central plate.

2. the pure reverse stream pipe shell heat exchanger of multipaths according to claim 1, it is characterized in that: the middle pass partition exporting near described shell side and external flow guiding cylinder, inner draft tube surround the outlet diversion cavity of semicircle annular, the middle pass partition of close described shell side import and external flow guiding cylinder, inner draft tube surround the import diversion cavity of semicircle annular.

3. the pure reverse stream pipe shell heat exchanger of multipaths according to claim 1, is characterized in that: described distinguish housing is at least 2 lobes, and composition circular cylinder body after welding with middle pass partition.

4. the pure reverse stream pipe shell heat exchanger of multipaths according to claim 1, is characterized in that: described middle pass partition is parallel to each other, and flow process number is at least 2 journeys.