Serrated Spiral Boiler Fin Tube , Brazing Spiral Finned Tube
Fin Tube Types
High frequency resistance welding spira finned tube
High-frequency resistance welding spiral fin tube is in be weldment
import high power high frequency current, by using the current
welding joint contact area and adjacent area to produce the
resistance of the hot melt welding contact surface to melt or half
of the plastic state, and then give the appropriate pressure
welding contact surface, thus complete finned tube welding work.
Brazing spiral finned tube
Brazing spiral fin tube is a kind of solder which is filled with a
solder with a melting point lower than that of the solder, and then
heated the solder welding temperature. When the solder does not
melt, the fusion well of solder is wetted and welded, and the
solder joint is formed by spreading out the contact point of the
solder piece, so as to complete the welding of spiral fin tube.
Integral spiral finned tube
The integral spiral finned tube is an integral spiral finned tube
which is formed by the continuous heating of medium frequency with
thick wall pipe (billet pipe).
Serrated spiral finned tube is a special-shaped extended surface
developed on the basis of spiral finned tube. Its manufacturing
process is similar to that of high-frequency welded spiral finned
tube, but the difference is that the gap of the strip must be cut
before winding the serrated spiral finned tube.When winding, the cut part is separated naturally, forming a gear
shape.On high frequency welding spiral fin hobbing winding technology not
only simplifies greatly reduced (deformation), has combined with
tight, high strength, thermal shock and mechanical shock, thermal
performance is good, small flow loss, strong corrosion resistance
performance, and has considerable diffusion surface, in cold and
hot condition for a long time is not easy to deformation, long
working life, also because of the destruction of flow boundary
layer and intensified heat transfer.This serrated fin has been widely used in air conditioners and
|Item||Base Tube O.D|
|Base Tube Thickness (mm)||Fin Height (mm)||Fin thickness(mm)||Fin Pitch(mm)|
|Range||25.4 mm ~1600mm||2.5 mm ~40 mm||0.5 mm ~20.0 mm||0.5 mm ~3.0 mm||5 mm ~ 25.4 mm|
|Material||Carbon Steel,Alloy Steel,Stainless Steel|
1. Good corrosion resistance
The wear is mainly due to the impact and cutting effect of gray
particles on the pipe. The wear is the most severe around the pipe
at a level of 30 degrees. When S1/d=S2/d=2, the wear amount here is
3 times of the average value.
Due to the change of air flow direction, the second row has the
most severe wear. When S1/d=S2/d=2, the second row is twice as much
as the first row wear, and the subsequent row wear is generally 30%
to 40% higher than the first row.
The arrangement of the first row is the same as the arrangement of
the first row in the sequence.Under the same conditions, the
maximum wear of the longitudinal tube bundle is 3-4 times less than
that of the staggered tube bundle.
The abrasion speed of the pipe is directly proportional to the
non-uniformity coefficient of the flue gas velocity KV3.33, and is
directly proportional to the non-uniformity coefficient of the fly
ash concentration Ku.
The h-shape finned tube economizer is arranged in sequence. The
h-shaped fin divides the space into several small areas and has a
uniform flow effect on the airflow. Compared with the optical tube
economizer, spiral fin economizer and longitudinal fin economizer
with staggered arrangement, the wear life is 3-4 times higher under
Flue gas side damper protects the bend part.
2. Reduced dust accumulation
Ash formation occurs on the pipe's back and windward sides.It is
easy to scour the pipe by disarrangement, and less dust accumulates
on the back.As for the pipe arrangement in sequence, due to the
fact that the air flow is not easy to flush the back of the pipe,
there is more ash accumulation in the pipe arrangement in sequence
than in the wrong column.
The h-type fin is welded on both sides of the pipe, which does not
accumulate ash, while the air flow flows straight, the air flow
direction does not change, and the fin does not accumulate ash.
A gap of 4-10 is left in the middle of the h-type fin, which can
guide the air flow to sweep the pipe fin to accumulate dust.
As the spiral Angle of the fin guides the flow direction, the ash
accumulation of the fin tube is more serious, and the economizer
which does not form loose ash cannot be used.Field operation shows
that the h-shaped fin tube does not accumulate ash, while the
spiral fin is seriously.
The longitudinal fin tube is formed by the flow of air along the
fin as the fin is welded on the surface and back of the accumulated
ash.Some areas are prone to dust accumulation.
The h-shaped fin, which forms a straight channel on both sides, has
the best blowing effect.
3. Compact space and low cost
The pipe set is much compact and reduces the height of tail smoke
The total weight is greatly reduced and the load of the suspension
system is reduced.
Reduce cost of economizer and integral boiler.
4. Reduce smoke lateral resistance
Reduce the operating and investment cost of induced fan.