83mm Pipe Laying CFB Water Wall Panels Low Air Leakage
Product Details
| Material: | Carbon Steel, Stainless Steel | Application: | Power Station And Industrial |
|---|---|---|---|
| Name: | Boiler Water Wall | Warranty: | 3 Years |
| Circulation Type: | Natural Circulation | Packing: | Standard Packing For Exportation |
| Highlight |
CFB Water Wall Panels,83mm Water Wall Panels,83mm CFB Water Wall |
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Product Description
83mm Pipe Laying CFB Water Wall Panels Low Air Leakage
Introduction
An evaporative heating surface consisting of a number of parallel pipes laid on the inner wall of a boiler hearth.The function of the water wall is to absorb the radiant heat of the high temperature flame or flue gas in the furnace, produce steam or hot water in the tube, and reduce the temperature of the furnace wall, and protect the furnace wall.In the large capacity boiler, the flame temperature in the furnace is very high, and the intensity of heat radiation is very large.40 ~ 50% or more of the heat in the boiler is absorbed by the water wall.Except for a few small capacity boilers, the water wall is the main evaporative heating surface in the modern water tube boilers.Water wall is divided into light tube type and membrane type according to its structure.Light tube water wall consists of ordinary boiler steel pipe (Fig. 1 light tube water wall).The closer the pipe arrangement is, the better the protection effect of the furnace wall is.Furnace walls are extensively made of light refractories and insulation materials.These materials can be built into the furnace wall, or laid on the water-cooled wall to become a tubular furnace wall for easy installation.
Membrane Water Wall
Membrane water wall is an air-tight structure consisting of pipes and fins.The advantages are less air leakage in furnace; can use pipe-laying wall, less load on steel structure and lower cost of boiler; easy to use suspension structure and improve thermal expansion system, suitable for large-scale mechanized production, high assembly rate, low heat storage capacity and shorten star-up and shutdown time. The disadvantage is that the manufacturing process is complex. Membrane water wall is often used in large capacity, high temperature and high pressure boilers.
Material and pipe diameter for medium, high and ultra-high pressure boilers, under normal water circulation conditions, pipe wall can be well cooled, carbon steel pipe can be selected. For sub critical and super critical pressure boilers, doe to the deterioration of heat transfer and the high medium temperature(especially when the super critical parameters are reached), it is often necessary to use internal threaded tubes(multi-head spiral grooves on the inner wall of the tube, the typical structure shown in Fig. 2) or Cr-Mo alloy steel tubes. For membrane water wall, the max. Temperature and stress of fins should also be checked. The outer diameter of water wall tubes of natural circulation boiler is generally 42-76mm, the sub-critical pressure controlled circulation boilers are 42-51mm, and the once-through boilers are 22-42mm.
Strong points of membrane water wall
(1) Ensure the sealing of furnace wall and reduce air leakage in combustion chamber.
(2)The realization of full water cooling in combustion chamber is beneficial to prevent coking under the condition of intensified combustion.
(3)The cooling time of start-up and shutdown of boilers can be shortened because of its small heat storage capacity, fast temperature rise and fast cooling in combustion chamber.
(4)Pipe-laying furnace wall is suitable, which greatly reduces the load of boiler frame and it is convenient for suspension and lifting.
(5)Compared with the bare tube type, the heat absorption capacity of the tube is improved.
(6)It improves the per-assembly degree of boiler components, facilitates and reduces the installation workload.
Water wall materials are generally made of carbon steel.When the boiler pressure is above 14 MPa, alloy steel is also partially used.Pipe outside diameter: natural circulation boilers generally use 51 ~ 83 mm; multiple forced circulation boilers and direct current boilers generally use 22 ~ 60 mm.The water wall of a DC boiler is not necessarily upright like that of a natural circulation boiler, and can also be horizontally surrounded or in other forms.When the parameters are high, especially in the direct-current boiler, in order to prevent the heat transfer deterioration in the high heat load area of the furnace, internal threaded tubes are often used or spoilers are installed inside the tubes.
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. |
Note
| 1 | Control of weld penetration to satisfy mechanical and heat transfer requirements Control of the deformation to acceptable tolerances. |
| 2 | Panels routinely require straightening in the workshop after welding and heat treatment, the question to be answered is can the shop then meet the required dimensional tolerances for successful site installation? |
| 3 | Can existing shop handling procedures be used as-is without adding excessive controls that will add cost and schedule. |
| 4 | The importance of preheating and its maintenance through the welding process could cause a number of handling and shop processing issues that will substantially increase cost. |
Product Highlights
83mm Pipe Laying CFB Water Wall Panels Low Air Leakage Introduction An evaporative heating surface consisting of a number of parallel pipes laid on the inner wall of a boiler hearth.The function of the water wall is to absorb the radiant heat of the high temperature flame or flue gas in the furnace, ...
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