CN103438749A

CN103438749A - U-shaped tube type multi-strand flow heat exchanger tube box structure

Info

Publication number: CN103438749A
Application number: CN2013103616684A
Authority: CN
Inventors: 方江敏; 张龙平
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2013-08-20
Filing date: 2013-08-20
Publication date: 2013-12-11
Anticipated expiration: 2033-08-20
Also published as: CN103438749B

Abstract

The invention provides a U-shaped tube type multi-strand flow heat exchanger tube box structure which comprises a guiding cylinder, a tube box end cover and pass partition boards. The U-shaped tube type multi-strand flow heat exchanger tube box structure is characterized in that the pass partition boards are arranged at the junction of an inlet and an outlet of the tube box guiding cylinder and the upper side and the lower side of the tube box guiding cylinder, therefore, a small part of fluid with lower temperature differences between the inlet and the outlet flows into one row or multiple rows of heat exchange pipes arranged above or below the junction of the inlet and outlet of the heat exchanger, the temperature difference of the junction of the inlet and the outlet of a tube sheet is lowered, thermal stress caused by the temperature difference between the liquid inlet and the liquid outlet is lowered, the thermal stress distribution of the tube sheet and thermal stress distribution of positions near the tube sheet is improved, and the risks during the operation of the heat exchanger is reduced.

Description

A kind of U-shaped tubular type Heat Exchangers channel structure

Technical field

The present invention relates to a kind of U-shaped tubular type Heat Exchangers channel structure, this structure can effectively be improved tube sheet and near thermal stress distribution thereof.

Background technology

In natural gas liquefaction process, often the U-shaped pipe heat exchanger is used for to the multiple flow heat exchange, because natural gas import and export Temperature Difference Ratio is larger, cause the localized heat stress of tube sheet import and export intersection larger, to heat exchanger, operation brings great risk, and the import and export temperature difference of another fluid streams is much smaller with respect to natural gas.

Summary of the invention

The technical problem to be solved in the present invention is to reduce U-shaped pipe Heat Exchangers tube sheet to import and export near the localized heat stress having a common boundary.

For solving the problems of the technologies described above, the invention provides a kind of U-shaped tubular type Heat Exchangers channel structure, comprise bobbin carriage end cap, adapter, guide shell, flange, tube sheet and pass partition, the fluid of this channel structure energy heat exchanger tube side is shunted, what make that a part imports and exports fluid that the temperature difference is less walks heat exchanger inlet and outlet upper and lower row or a few row's heat exchanger tube that have a common boundary, thereby reduce the temperature difference that tube sheet is imported and exported intersection, reach the purpose that reduces tube sheet localized heat stress.

Wherein, described guide shell is positioned at the heat exchanger inlet and outlet end.

Wherein, be provided with pass partition in described guide shell, pass partition lays respectively at guide shell and imports and exports intersection and upper and lower both sides thereof, and all pass partitions all extend to tube sheet from the bobbin carriage end cap, and all pass partitions and bobbin carriage end cap, tube sheet and stream guiding barrel weld together.

Wherein, described guide shell is together with the heat exchanger tube sheet flange welding.

Wherein, described bobbin carriage end cap is positioned at the other end of bobbin carriage guide shell and tube sheet flange welding end.

Wherein, described tube case end is covered with a plurality of import and export adapters.

Wherein, described bobbin carriage end cap and guide shell weld together.

The invention has the advantages that:

By channel structure, make a part import and export the less fluid of the temperature difference and walk the heat exchanger inlet and outlet both sides, reduced near temperature difference heat exchanger tube sheet is imported and exported, improve near localized heat stress distribution heat exchanger tube sheet is imported and exported, reduced the operating risk of heat exchanger.

The accompanying drawing explanation

Utilize accompanying drawing to be further described invention, but the embodiment in accompanying drawing does not form any limitation of the invention.

Fig. 1 is the structural representation of the embodiment of the present invention.

Fig. 2 is the U-shaped pipe heat exchanger fluid driving of the multiple flow schematic diagram that six general imports six export.

The fluid driving schematic diagram that Fig. 3 is the embodiment of the present invention.

In figure: 1 bobbin carriage end cap; 2 entrance sleeves; 3 propylene entrance sleeves; 4 propylene discharge connections; 5 discharge connections; 6 pass partitions; 7 tube sheets; 8 flanges; 9 guide shells; 10 natural gas passages; 11. propylene passage.

The specific embodiment

Below in conjunction with drawings and Examples, the present invention is further detailed explanation.

Embodiment mono-

As shown in Figure 1, a kind of U-shaped tubular type Heat Exchangers channel structure, comprise bobbin carriage end cap 1, entrance sleeve 2, discharge connection 5, guide shell 9, flange 8, tube sheet 7 and pass partition 6, described guide shell 9 is positioned at the heat exchanger inlet and outlet end, described guide shell 9 right-hand members and flange 8 weld together, right-hand member welds mutually with bobbin carriage end cap 1, it is characterized in that: in described guide shell 9, be provided with pass partition 6, pass partition 6 lays respectively at guide shell 9 and imports and exports intersection and upper and lower both sides thereof, all pass partitions 6 all extend to tube sheet 7 from bobbin carriage end cap 1, all pass partitions 6 and bobbin carriage end cap 1, tube sheet 7 and guide shell 9 weld together, on described bobbin carriage end cap 1, arrange be respectively arranged with pass partition 6 between cavity the propylene entrance sleeve 3 and the propylene discharge connection 4 that are connected.

Described bobbin carriage end cap 1 is provided with entrance sleeve 2 and the discharge connection 5 more than 2.

As shown in Figure 1, tube side has two fluid streams, one is natural gas, one is propylene, wherein the import and export Temperature Difference Ratio natural gas of propylene is imported and exported and to be had a narrow range of temperature a lot, allows a part of propylene enter from propylene entrance sleeve 3, in guide shell 9 due to the existence of pass partition 6, this fluid streams a row or a few row's U-shaped pipe above import and export having a common boundary flow through, then from propylene discharge connection 4 out.Natural gas and remaining propylene pass into from entrance sleeve 2, from discharge connection 5 out.

As shown in Figure 2, this is the U-shaped pipe heat exchanger fluid driving of the multiple flow schematic diagram of six general import six outlets, and the first half is import, the latter half is outlet, circulation natural gas in the natural gas path 10, and inlet temperature is 200K, outlet temperature is 100K, and importing and exporting the temperature difference is 100K; The interior circulation propylene of propylene passage 11, inlet temperature is 180K, and outlet temperature is 130K, and inlet temperature is 50K.The import and export of the import and export Temperature Difference Ratio natural gas of propylene have a narrow range of temperature a lot, because thermal stress is directly proportional with the temperature difference, the temperature difference more thermal stress is larger, it is 100K that natural gas is imported and exported the temperature difference, the temperature difference is larger, cause the localized heat stress of natural gas import and export intersection larger, it is relatively little that propylene is imported and exported near localized heat stress.

As shown in Figure 3, this is the fluid driving schematic diagram of the embodiment of the present invention, by six import six outlets, becomes seven import seven outlets, the first half is import, the latter half is outlet, circulation natural gas in the natural gas path 10, and inlet temperature is 200K, the interior circulation propylene of propylene passage 11, inlet temperature is 180K, because just change the arrangement mode of fluid, total heat transfer thermal efficiency of heat exchanger is constant, therefore the outlet temperature of natural gas is 100K, the outlet temperature of propylene is 130K.In this fluid driving, what the heat exchanger inlet and outlet intersection passed into up and down is propylene, and the import and export temperature difference of propylene is smaller, thereby has reduced the localized heat stress of heat exchanger inlet and outlet intersection.

The above embodiment of the present invention is only for example of the present invention clearly is described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in the protection domain of the claims in the present invention.

Claims

1. a U-shaped tubular type Heat Exchangers channel structure, comprise bobbin carriage end cap (1), entrance sleeve (2), discharge connection (5), guide shell (9), flange (8), tube sheet (7) and pass partition (6), described guide shell (9) is positioned at the heat exchanger inlet and outlet end, described guide shell (9) right-hand member and flange (8) weld together, right-hand member welds mutually with bobbin carriage end cap (1), it is characterized in that: be provided with pass partition (6) in described guide shell (9), pass partition (6) lays respectively at guide shell (9) and imports and exports intersection and upper and lower both sides thereof, all pass partitions (6) all extend to tube sheet (7) from bobbin carriage end cap (1), all pass partitions (6) and bobbin carriage end cap (1), tube sheet (7) and guide shell (9) weld together, described bobbin carriage end cap (1) is upper arrange be respectively arranged with pass partition (6) between propylene entrance sleeve (3) the propylene discharge connection (4) that is connected of cavity.

2. U-shaped tubular type Heat Exchangers channel structure according to claim 1, described tube case end is covered with entrance sleeve (2) and the discharge connection (5) more than 2.