Product Thermal Capacity: 1 - 20 t/h
Working Pressure: 0.7 - 2 Mpa
Available Fuel: Nature gas, coke oven gas, biogas, methanol, liquid propane gas, diesel, heavy oil, light oil, crude oil, etc.
Available Industries: Heat supplying, chemical, food, textile, printing and dyeing, cigarettes and tobacco, fodder, pharmacy, building materials, brewery, rubber, hospital etc.
WNS series horizontal internal combustion boiler is a boiler shell type 3 passes wetback oil/gas fired boiler. After fuel is being atomized by burner, flame is full of the wave furnace and transfer heat via furnace wall, this is 1st pass; the high temperature smoke is collected in reversal chamber and then enters 2nd pass which is grooved tubes bundle area; after heat convection, air temperature gradually falls and goes to front smoke box and turn to 3rd pass, which is smooth tubes bundle area, and then enters chimney passing back smoke box and exhausted to the atmosphere.
1. Digitized manufacture
The key part such as material cutting, rolling, drilling are proceeded by advanced CNC machining process to reduce the assemble stress and extend boiler working lifetime.
The front and back smoke chamber plates are cut by CNC plasma cutting machine and looks tidy and beautiful.
2.Easy operation and maintenance
Fully automatically operating, with automatically adjustment and protection of burning, water level, temperature and steam pressure.
3. Longer working life
Smoke tube and tube sheet connection is expanded first to eliminate the gap between them, then adopt automatic argon arc welding to relief the stress and expand boilers working life.
Longitudinal and girth joint adopt advanced automatic submerged-arc welding for good welding quality. All longitudinal and girth joint will have 100% radiographic inspection.
Fin tube us ND steel or stainless-steel material which avoid low temperature corrosion.
Inspection procedure point is set up to guarantee the sequence of expanding and welding, avoid cracking of the tube sheet holes.
4. Less fuel consumption
High quality aluminum silicate fiber is used with fire clay insulation, to control the boiler body temperature below 45℃ to control heat lost.
Sufficient steam storage room and heating area makes boiler to generate high quality steam and high thermal power.
Condenser is added to reuse the waste heat of the exhausted smoke to increase feeding water’s temperature and reduce emission temperature, which can increase the thermal efficiency above 98% and save operating cost.
File Size: 97KB Click to view16:09Jul 19, 2019· Fire tube boilers are used for many industrial processes to generator steam. They are one of the two common boiler designs commonly employed today, the other design being the water tube boiler.
Horizontal Return Tubular Fire Tube Boiler. As one of the oldest and most simple designs for … The wet back design refers to water at the back of the boilers inversion chamber thus eliminating the need for refractory. Another feature is that the tubes are both expanded and welded to the tube-sheets. The SG Firetube Boilers are only available in a two pass design. The two pass design has a more balanced heat transfer from the tube to the water than a three pass design.
Oct 07, 2016· Boiler is a closed vessel that is used to produce steam at desired pressure. There is a reversal chamber for flue gases between 1st & 2nd pass is provided inside the boiler shell .In dryback boiler rear wall is lined with refractory. In dryback boiler reversal chamber  has a rear wall that is lined with refractory, which passes combustion gasses from the furnace to multiple tube sheets and …
Reversal chamber is the posterior portion of the boiler combustion chamber through which the flue gases travel from the furnace’s first pass to the second pass tubes. And based on the construction of reversal chamber, boilers can be classified into wet-back boilers and dry-back boilers. In general, our boilers, like the WNS gas and oil fired boiler, are designed as wet-back structure.
A minimum return water temperature of 130 °F (54 °C) to 150 °F (66 °C) to the boiler, depending on the specific design, is used to avoid condensing water vapor from the flue gas and dissolving CO2 and SO2 from the flue gasses forming carbolic and sulfuric acid, a corrosive fluid that damages the heat exchanger.
A "Scotch" marine boiler (or simply Scotch boiler) is a design of steam boiler best known for its use on ships. Sectional diagram of a "wet back" boiler. The general layout is that of a squat horizontal cylinder. One or more large cylindrical furnaces are in the lower part of the boiler shell. Above this are many small-diameter fire-tubes.
Apply these costs to the average lifespan of the boiler: $6,000 X 8 = $48,000 $ 500 X 25 = $12,500 Compare the costs of replacing the rear door gasket of your wetback design: $30 X 25 = $750 The difference between the hard refractory dry back maintenance and the wetback maintenance is $60,500 - $750 = $59,750. Now comes the shocking part of the
Author: saVRee 3D Dry Back Boilers: The reversal chamber in dry back boilers is not completely surrounded by water. The posterior part is exposed to the atmosphere. This leads to the increased radiation losses, as the radiant heat is lost to the atmosphere instead of going to the water as in wet back boilers. Earlier generation boilers used to be dry back.
The dryback boiler reversal chamber has a rear wall that is lined, or jacketed with refractory, which passes combustion gasses from the furnace to multiple tube sheets and reflects burner heat, resulting in exterior radiation losses. The dry back boiler design uses a common rear tube sheet and features convenient fire-side and water-side access.
The wetback boiler specifically has water on the side opposite the flame gun or "target brick" in the old-style boilers. In a wetback style this is iron usually. A dry-back example might be an old porkchop style boiler where a refractory chamber and target brick wall is built up the back side.
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