Zhangjiagang HuaDong Boiler Co., Ltd. |
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Power Station Heat Preservation Gas Hot Water Boiler Spare Parts Water Wall Panels
Product Information
A waterwall in a boiler is any furnace wall that is comprised of refractory and tubes in a water-tube boiler. The tubes are evenly spaced and generally connect to headers which in turn are connected back to the main generating bank of the boiler. They serve a two fold purpose here in that they capture heat that would otherwise escape to the atmosphere and help heat the water in the boiler. And they also help keep the refractory cool.This prevents spalling of the refractory.
Boiler water walls are membrane walls that are made of tubes welded
together with or without a strip of metal in between. These walls
form the enclosure of the coal combustion chamber. Water wall tubes
are also referred to as the evaporator section; they contain water
mostly in liquid form which gradually evaporates as it rises in the
boiler.
Our membrane water wall are manufactured using high grade raw
material and contemporary production equipment at our advanced
manufacturing unit. The offered range is available in various
sizes, shapes and specifications, as per the requirements of our
esteemed clients. Further, these are delivered to the clients
within promised time frame.
Specification
Name | Membrane water panel |
Material | Carbon steel,Alloy steel,etc. |
Tube size | Φ38 - 76 mm, Customization |
Standard | ISO , ASME |
Model | Studded |
Dimension | Customization |
Manufacturing process | Material→Ingot → Hot/Cold-Rolling→ Heat treatment (Normalizing+ tempering) → Inspection →Polishing→Tube joint welding→Assembly →Welding →Inspection→Heat treatment→Hydraulic pressure test→Painting→ Packaging |
Installation location | Around the boiler combustion chamber |
Construction Details
The combination characteristics of membrane water cooling wall are
as follows:
1. Check and adjust the width, length, flatness and diagonal of the
pipe row when the segmented pipe row is hoisted onto the
combination frame.If the width of the tube row is greater than or
less than the specified size, the fin can be cut to an appropriate
length, adjusted to the specified size and then re-welded.When the
diagonal difference of pipe row exceeds lOmm, fins between some
pipes with larger size can be cut to reduce the distance between
pipes to eliminate the diagonal difference, and then the fins can
be welded.When the unevenness of the pipe row exceeds the allowable
range, gantry frame can be used to correct the top pressure of the
jack.
2. The butt joint of pipe row is different from that of a single
pipe.The welding joint of a single pipe shrinks by about 1-2mm
after welding, which has no effect on other pipes.But the pipe row
is not the same, two sections of pipe row butt welding, if from one
side to the other side of the sequence of welding, welding to the
end of the pipe caused by the deformation is very large.Therefore,
before the butt welding, the butt clearance of this welding joint
should be comprehensively measured, and according to the butt
clearance is too small, moderate, too large classification, if the
butt clearance is too large or too small, must take the method of
cutting the pipe, replaced with a moderate short pipe.At this time,
due to the shrinkage of welding, the pipe with a larger gap will
become solderable. In order to reduce the shrinkage deformation of
pipe welding, the method of symmetry and cross welding should be
adopted.
3. The lower part of the front and rear water cooling wall has
furnace bottom (cold ash bucket), and the upper part of the rear
water cooling wall has flame Angle, so the size of the component is
larger and the shape is more special, so it is difficult to
combine.
4. The single pass ball of the rear water wall pipe is different
from other heating surface pipes.Because the rear water wall in the
upper header box has a flameproof Angle, the number of flameproof
Angle bending pipe is the same as that of the rear water wall, in
order to increase the rigidity of the flameproof Angle, there is
also a considerable number of spacing straight pipe (most furnace
type).At the intersection of flame Angle and straight pipe,
equidiameter special-shaped cast steel tee (three-branch pipe) is
installed.In the straight tube and the junction between the top
allied tank is equipped with orifice Φ 5 mm or Φ restrictor of 10
mm.In this way, most of the working medium bent pipe is conducive
to the cooling of the flame Angle, and a small part of the working
medium bent pipe ensures that the straight pipe and the curved pipe
have the corresponding amount of expansion, so as to reduce the
internal stress, so the difficulty of passing through the ball
increases.
Additional
1 | Water wall panels are used in Waste Heat recovery boilers. |
2 | We manufacture Water wall panels,these are fabricated out of carbon steel tubes to customers' drawings and specifications. |
3 | Special care is taken for ovality and thinning at the bent portion,during fabrication. |
4 | We are manufacturing and supplying a comprehensive range of Waterwall Panels. |
5 | The tubes offered by us are known to withstand a great internal pressure as a continual strip of fin material is wound spirally on the tube. |
6 | These tubes are known to provide heat uniformly that result in an increased heat output. |
7 | The main function of water wall panels in boiler is to absorb the
heat generated by high temperature flame or flue and to generate
steam or hot water in tubes, hence to reduce the temperature in the
chamber. |
Application
1 | Energy saving enviromental protection china supplier membrane water wall for CFB boiler are membrane walls that are made of tubes welded together with or without a strip of metal in between. |
2 | These walls form the enclosure of the coal combustion chamber. |
3 | Water wall tubes are also referred to as the evaporator section; they contain water mostly in liquid form which gradually evaporates as it rises in the boiler. |