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Operating Principle
Water is circulated inside the tubes of the boiler, with the heat source surrounding them. The heated water rises into the steam drum where saturated steam is drawn off the top of the drum. Cool water at the bottom of the steam drum returns to the feedwater drum via large-bore ‘downcomer tubes’, where it pre-heats the feedwater supply. (In large utility boilers, the feedwater is supplied to the steam drum and the downcomers supply water to the bottom of the waterwalls). To increase economy of the boiler, exhaust gases are also used to pre-heat the air blown into the furnace and warm the feedwater supply.
Advantages of Water Tube Boilers
- Steam production from 4.5 to 80 t/h
- Saturated steam and superheated steam up to 500°C
- 95.5% efficiency, without additional heat recovery system
- 10 – 90 Barg service pressure
- Suitable for use indoor or outdoor use
- Can be used with all types of liquid and gaseous fuels
- Construction compliant with PED : 2014/68/EU and Harmonized Standard EN-12952
- Different unattended modes with supervised operation until 72 Hours
- Reliable