The exhaust gases then travel from the inversion chamber through the combustion tubes and exit the boiler through the exhaust stack. 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.

2019-11-28 · In general, our boilers, like the WNS gas and oil fired boiler, are designed as wet-back structure. Disadvantages of Dry-back boilers. Dry back boilers are subject to deteriorating rear refractory, leaking baffles, leaking door seals, and often found with a heat-stressed rear tube sheet.

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 bo

Dry-back designs rely on a refractory, fire brick, or some combination of the two to avoid the end closure from overheating. 4. Vertical Fire Tube Boiler Design. As a one-pass boiler design, vertical fire tube boiler has the furnace on the bottom. The tubes run between the upper and lower tube sheets. With this type of design, the furnace may

2019-11-29 · 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.

: 97KBThe weakest part of a conventional fire tube boiler is found in the combustion gas turnaround chamber, located just after the boiler furnace and comprised of the refractory frame and the back lid, the latter of which is made of refractory and insulating materials.

The dry back design refers to the use of refractory at the back of the boiler in the inversion chamber. The FT Firetube Boilers are specifically designed to minimize the thermal stress on the boiler not only at high pressures, but at low pressures as well.

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.

Fire Tube Boiler Designs. It is possible to vary the boiler design in several ways: Wet back – the rear of the furnace is surrounded by a water jacket. Dry back – the rear of the furnace is surrounded by sheet metal only. Steam dome – a dome mounted onto the top of the boiler shell to aid steam liberation.