Stainless Steel Tube for Evaporater Muffler Heat Exchanger Boiler
300 Series Pipes 304 316L Tubes IntroductionProduct
Description Product Parameters The finned tube is to
improve the heat exchange efficiency, usually by adding fins on the
surface of the heat exchange tube to increase the external surface
area (or internal surface area) of the heat exchange tube, so as to
achieve the purpose of improving the heat exchange efficiency, such
a change Heat pipe.classification1. Divided by fin structure
characteristicsAccording to the shape and structure of the fin, the
finned tube can be divided into the following types:square finned
tube, spiral finned tube, longitudinal finned tube, etc., spiral
serrated Finned tubes (Helical Serrated Finned Tubes), inner finned
tubes (inner finned tube) 2. According to whether the fin material
of the finned tube is the same as the material of the tube body, it
can be divided into a single metal finned tube and a bimetallic
composite finned tube.3. According to different processing
techniques of finned tubes, finned tubes can be divided into:
rolled finned tubes (extruded fin tubes), welded and formed finned
tubes, roll-formed finned tubes, and packaged finned tubes.Fin tube
production technology statusA set of finsThe set fin process is to
process a batch of individual fins with a punch in advance, and
then use manual or mechanical methods to set the fins on the outer
surface of the pipe by interference at a certain pitch height (wing
pitch). It is the earliest applied method for processing finned
tubes. Due to the simple process of the kit, the technical
requirements are not high, the equipment used is cheap, and it is
easy to maintain, so many factories are still using it. This
process is a labor-intensive process plan, suitable for the capital
and technical conditions of general small factories or township
enterprises.B mosaic spiral finInlaid spiral finned tube is a
spiral groove with a certain width and depth pre-processed on the
steel pipe, and then the steel belt is embedded on the steel pipe
on the lathe. During the winding process, due to a certain
pre-tightening force, the steel belt will be tightly tightened in
the spiral groove, thus ensuring a certain contact area between the
steel belt and the steel pipe. In order to prevent the springback
of the steel belt, both ends of the steel belt are welded to the
steel pipe. In order to facilitate inlaying, there should be a
certain side clearance between the steel strip and the spiral
groove. If the backlash is too small and the interference is
formed, the inlay process is difficult to proceed smoothly. In
addition, the wound steel belt will always rebound to a certain
extent, and as a result, the steel belt and the bottom surface of
the spiral groove cannot be well joined. Inlaid fins can be carried
out on general equipment, the cost is not high, but the process is
complex and the production efficiency is low.C brazed spiral finned
tubeThe brazed spiral finned tube is processed in two steps. First,
the steel strip plane is perpendicular to the axis of the pipe and
wound on the outer surface of the pipe in a spiral manner, and the
two ends of the steel strip are welded to the steel pipe to fix,
and then to eliminate the gap between the steel strip and the steel
pipe, the method of brazing Weld the steel strip and steel pipe
together. This method is expensive because of its cost, so another
method is often used, that is, the tube with the steel strip
wrapped in it is placed in a zinc bath for overall hot-dip
galvanizing instead. Using integral hot-dip galvanizing Although
the plating solution may not penetrate well into the very small gap
between the fin and the steel pipe, a complete galvanized layer is
formed on the outer surface of the fin and the outer surface of the
steel pipe. The spiral finned tube with integral hot-dip
galvanizing is limited by the thickness of the galvanized layer
(when the galvanized layer is thick, the zinc layer is poorly solid
and easy to fall off), and the zinc liquid cannot penetrate into
the gap completely. The combination rate of steel pipes is still
not high. In addition, the heat transfer coefficient of zinc is
smaller than that of steel (about 78% of steel), so the heat
transfer capacity is low. Zinc is extremely susceptible to
corrosion in acids, alkalis, and sulfides. Therefore, the use of
galvanized spiral finned tubes is not suitable for making air
preheaters (recovery of boiler flue gas waste heat).D high
frequency welding spiral finHigh-frequency high-frequency welding
spiral finned tube is one of the most widely used spiral finned
tubes. It is now widely used in electric power, metallurgy, cement
industry preheat recovery and petrochemical industry.
High-frequency welding spiral finned tube is While the steel tape
is wound around the steel tube, the skin effect and proximity
effect of the high-frequency current are used to heat the outer
surface of the steel tape and the ste
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