CN2058738U

CN2058738U - Support in between of pipe for shell-and-tube exchanger

Info

Publication number: CN2058738U
Application number: CN 89218385
Authority: CN
Inventors: 邓先和; 邓颂九
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 1989-10-20
Filing date: 1989-10-20
Publication date: 1990-06-27

Abstract

The utility model adopts a hollow ring as a support in between of pipe for shell-and-tube exchanger. The hollow ring's outer diameteris determined by the dimension of a heat-transfer tube bundle's tube pitch and a heat-transfer tube's outer diameter, and the hollow ring's longitudinal pitch is determined by the deflection of the heat-transfer tube. The structural form of the hollow ring can be a tube coupling hollow ring or a spiral line hollow ring. The hollow ring can be arranged in the tube gap of a strengthened heat-transfer tube symmetrically, and makes the outer surface of the hollow ring and the outer surface of the heat-transfer tube being in line contact. Adopting the heat exchanger of the utility model, the total heat-transfer coefficient enhances clearly, and the heat-transfer area is saved drastically.

Description

Support in between of pipe for shell-and-tube exchanger

The utility model belongs to supporter between a kind of pipe of shell-and-tube heat exchanger.

Americanized engineering meeting, the heat transfer proceeding was the 236th in 1984,80 volumes, disclose a kind of rod baffle in the 104th～109 page (" AICHE Heat Transter Conference Symposium Series " 1984 №: 236, V1.80PP104～109) and added the integral low-finned tube shell heat exchanger.Its purpose is to improve the tube bank resistance to shock, reduces the drag losses on the non-heat-transfer area, and its heat transfer property is better than the segmental baffle shell-and-tube heat exchanger and the toroidal membrane shell-and-tube heat exchanger of present industrial extensive use.Weak point is that rod baffle itself remains a non-heat-transfer area, produce fluid vortex in rod baffle lee side, except that less a part of turbulence energy can be delivered on the heat-transfer area of heating surface bank, most turbulence energy then is consumed among the vortex of fluid in vain, is difficult to energy loss with fluid and effectively utilizes convection current augmentation of heat transfer on heat-transfer area.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art and provides a kind of fluid that makes to drop to supporter between MIN shell-and-tube heat exchanger pipe at the drag losses on the non-heat-transfer area.This supporter cooperates suitable intensify heat transfer pipe (low finned tube, convergent-divergent pipe or band pipe etc.), just can utilize the fluid turbulent degree on the roughness promotion heat-transfer area on the heat-transfer area, make fluid almost all drop on the heat-transfer area of heating surface bank at the flow resistance loss of shell side, thereby make flow resistance loss be converted into raising more effectively, reach good augmentation of heat transfer effect the shell side heat transfer coefficient.

It is supporter between the shell-and-tube heat exchanger pipe that the utility model adopts cavity ring.The outer diameter D of cavity ring _OBy the tube pitch t of heating surface bank and the outside diameter d of heat-transfer pipe _OSize and decide, its computing formula is D _O= T-d _OThe tube coupling length L of cavity ring _O=1～1.2D; Wall thickness δ=0.07～the 0.09D of cavity ring; Cavity ring installation longitudinal pitch L decides on the amount of deflection of heat-transfer pipe, can be 200mm～1500mm.The version of cavity ring can be tube coupling cavity ring or helix cavity ring.The pitch L of helix cavity ring ₁=0～0.25D _O

Cavity ring should be installed in the middle of the tube gap of intensify heat transfer pipe (low finned tube or convergent-divergent pipe or band pipe etc.) symmetrically, and makes the outer surface of cavity ring be line with the outer surface of heat-transfer pipe to contact.

As follows to description of drawings:

Fig. 1 is a tube coupling cavity ring schematic diagram;

Fig. 2 is a helix cavity ring schematic diagram;

Fig. 3 is a cavity ring supporter scheme of installation.

D among Fig. 1,2 _OBe the cavity ring external diameter; D _iBe the cavity ring internal diameter; L _OBe cavity ring tube coupling length; L ₁Pitch for the helix cavity ring.1 is cavity ring among Fig. 3; 2 is heat-transfer pipe; d _OBe the heat-transfer pipe external diameter; T is the heat transfer tube pitch; L is that cavity ring is installed longitudinal pitch.

The inventor once had following embodiment:

As shown in Figure 3, the outside diameter d of heat-transfer pipe _O=19mm, tube pitch t=25mm, heat-transfer pipe is square arrangement, and cavity ring is distributed in the middle of the heat-transfer pipe symmetrically, and its outer surface is line with the outer surface of heat-transfer pipe and contacts.The cavity ring outer diameter D _O=16mm; The cavity ring inside diameter D _i=14mm; The length L of cavity ring _O=16mm; Cavity ring is installed longitudinal pitch L=700mm; When adopting the helix cavity ring, the pitch L of helix cavity ring ₁=1.6mm.The experimental result of adopting the intensify heat transfer pipe that such scheme makes shows: cavity ring supporter resistance of convection cell in shell side is very little, can in the shell side design, ignore the flow resistance of cavity ring, and be similar to the situation of unsupported parallel baffled tube bank.The cavity ring supporter does not have any influence to the convection heat transfer' heat-transfer by convection of shell-side fluid yet, can be used as unsupported situation yet and handles.

Adopt shell-and-tube heat exchanger of the present utility model compared with prior art, heat transfer property is significantly improved. The inventor had once done a large amount of experiments, had obtained concrete data. Now with its Specifeca tion speeification compared with the prior art such as following table:

Annotate: A_OBe segmental baffle shell-and-tube heat exchanger heat transfer area (m²）

a _OBe segmental baffle shell-and-tube heat exchanger shell side heat transfer coefficient (Kcal/m ²Hr ℃)

* segmental baffle adds the plain tube data, selects from Wei Dean " sulfuric acid industry " fourth phase, 1974.

* the rod baffle data that add the double-sided overall low finned tube select from Americanized engineering can heat transfer proceeding in 1984.

By the comparison of last table, promptly visible employing total exchange coefficient of the heat exchanger of the present utility model is significantly improved and has saved heat transfer area significantly.Routinely, the processing charges of intensify heat transfer pipe only accounts for about 15% of tubing price, and therefore, the saving of heat transfer area has brought great economic benefit.

Claims

1, supporter between a kind of shell-and-tube heat exchanger pipe is characterized in that the cavity ring that is shaped as of supporter, and the external diameter of cavity ring (Do) is decided by the size of the external diameter (do) of the tube pitch (t) of heating surface bank and heat-transfer pipe, and its computing formula is Do= T-do; The length L o=1 of cavity ring～1.2Do; Wall thickness δ=0.07～the 0.09Do of cavity ring; Longitudinal pitch L=200mm～1500mm, cavity ring is installed in the middle of the tube gap of intensify heat transfer pipe symmetrically, and makes the outer surface of cavity ring be line with the outer surface of heat-transfer pipe to contact.

2, supporter between shell-and-tube heat exchanger pipe according to claim 1, the version that it is characterized in that supporter is tube coupling cavity ring or helix cavity ring.

3, helix cavity ring according to claim 2 is characterized in that its pitch (L ₁) be 0～0.25D _O