fire tube boiler design for dry back reversal chamber and wet back

Horizontal Return Tubular Fire Tube Boiler. As one of the oldest and most simple designs for … Dec 09, 2019· Fire Tube Boilers Also referred to as smoke tube boilers, shell boilers, package boilers Multiple gas paths – 2, 3 and 4 pass Internal furnace or fire box as the 1st pass Dry back or wet back design Single fuel or dual fuel design Little or no steam separation equipment +wet +back +boiler – Steam Boiler in Mexico. Removing a back boiler.

A dry base boiler has a fire box under the boiler and will need refractory material oposite the burner (target wall) to absorb and help distribute the heat back up into the bottom of the boiler. Since the fire is under the boiler, most dry based boilers are vertical tube to get the exhaust gases past the boiler and out the top mounted flue.

The typical design is the "wet back", where the rear face of the combustion chamber is water-jacketed as a heating surface. The "dry back" variation has the rear of the combustion chamber as an open box, backed or surrounded by only a sheet-metal jacket. This simplifies construction, but also loses much efficiency. It is used for only small boilers where capital cost outweighs fuel costs.

This type of turnaround chamber is called a “Wet-Back” in contrast to the “Dry Back” that refers to traditional boilers with turnaround chambers made of fragile refractory and insulating materials. The Wet-Back design provides the following advantages over a traditional (Dry Back) boiler: Greater boiler efficiency (less fuel consumption)

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 [1] has a rear wall that is lined with refractory, which passes combustion gasses from the furnace to multiple tube sheets and resulting in radiation losses. Wetback boiler designs have a water gap between the furnace and back wall…

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

Figure 3.2.1a shows a dry back boiler where the hot gases are reversed by a refractory lined chamber on the outer plating of the boiler. Figure 3.2.1b shows a more efficient method of reversing the hot gases through a wet back boiler configuration. The reversal chamber is contained entirely within the boiler.

Wet-back Fire Tube Boiler for Sale 2018-08-14 11:15:37. The two most commonly types of boilers are the dry and wet back. Wet back have steadily become more popular option as they are considerably more efficient and require far less maintenance. The term ‘wet back’ comes from the fact that the reversal chamber is completely surrounded by water.

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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.

A fire-tube boiler is a type of boiler in which hot gases pass from a fire through one or (many) more tubes running through a sealed container of water. The heat of the gases is transferred through the walls of the tubes by thermal conduction, heating the water and ultimately creating steam.. The fire-tube boiler developed as the third of the four major historical types of boilers: low