Three pass fire tube boiler
Structure: Single drum/ Horizontal type
Output: Steam or Hot Water
Rated output capacity: 1 t/h-20 t/h 0.7MW-14MW
Rated working pressure:0.7/1.0/1.25Mpa
Fuel : oil or gas
For the type of three pass fire tube boiler, each set of tubes that hot combustion flue gas travels through before making a turn within the boiler, is considered a "pass." Three pass firetube boiler designed by Shengli Boiler consists of three sets of horizontal tubes, with the stack outlet located on the rear. A downdraft design keeps the cooler water from having an effect on the hot surfaces within the boiler.
In a word, a boiler with more passes provides more opportunities for hot gasses to transfer heat to the water in a boiler and operate more efficiently, at the same time, boiler efficiency is deeply affected by the tube design, and not simply the number of passes. It is possible for a three pass boiler with a tube design that allows more heat transfer time to deliver the same or higher efficiency rating than a four pass boiler with standard tubes.