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Twisted tube, Twist Flate-tube, Brown twisted tube

Industrial Corporation Limited

Twisted tube, Twist Flate-tube, Brown twisted tube

Country/Region china

Company Industrial Corporation Limited

Categories Tube Heat Exchanger

Update 2016-10-21 16:53:34

ICP License Issued by the Chinese Ministry

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Twist Flate-tube (Twisted tube)Heat Exchanger
Twist flat-tube is one kind of enhanced heat transfer tubes that were firstly presented by Swiss Allares Company, and then improved by the United States Brown company.
2.1 Structure and manufacture of twist flat-tube
The characteristic of twist flat-tube is that every cross section of the tube is oval, when assemble heat exchangers they can be mixed bundle (that is, the mixed use of twist flat-tube and bare tube), and can also be a pure twist flat-tube bundle.
The manufacturing process includes two forming steps: "partial pressure" and "distortion". The tube cross section is ellipse type the ratio of long and short axis is designed according to the flow velocity in heat transfer tube. When the flow rate in tube is low, we can increase the ratio of the long and short axis, or reduce the flow surface.
2.2 Enhanced heat transfer principles of twist flat-tube
The unique structure of twist flat-tube can make the flow in tube pass and shell pass in the spiral motion at the same time, in this way it enhanced the turbulent intensity. The heat transfer coefficient of the twist flat-tube is 40% higher than the normal one, but the pressure drop is almost the same.
2.3 Advantages of heat exchanger with twist flat-tube
1Lower pressure dropNo baffle plate, lower pressure drop in the
shell pass
2Higher heat transfer efficiencyIt can increase the turbulent intensity,
make the shell flow velocity and the direction
change regularly, and enhance the mixture in
lengthways
3Less depositNo blind zone in the shell
2.4 Specification of twist flat-tube heat exchanger
Fig: Basic dimension parameter figure of twist flat-tube
Table: Basic parameter table of twist flat-tube
Spec.Lead St(mm)Long axis of twist flat-tube a(mm)Length of two ends bare tube(mm)
14x1.515020025030016.0 Arbitrary length
16x1.515020025030018.5Arbitrary length
19x1.515020025030021.0Arbitrary length
25x1.520025030035029.0Arbitrary length
32x2.520025030035038.0Arbitrary length
Note: The above table is the basic parameter of standard twist flat-tube.Twist flat-tube can be manufactured according to St and L , if there are special requirements.
2.5 Application of the twist flat-tube
As twist flat-tube has developed and improved fastly in recent years, it is much more reliable and effective, and almost can be used in all shell and tube heat exchangers. More than 400 twist flat-tube heat exchangers have been used since 1984, and they can be used in gas-gas, liquid-liquid and liquid-gas heat transfer process, including chemistry, petroleum, food, papermaking, electric power, metallurgy, mining, and urban heating industry.
2.6 Application example
In 1997, Lanzhou refinery changed the traditional heat exchangers in the Ketone benzene dewaxing unit into the twist flat-tube heat exchangers, which were designed and fabricated by a local company. According to the process parameters, the HETECH was used for the type selection calculation of twist flat-tube heat exchanger.
Table: Related parameters of benzol-ketone dewaxing process
ItemTube passShell pass
MediumSolven

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