SCHNEIDER-Three Pass Boilers | series HDO


High pressure steam generators in single flame-tube design


steam generation up to 25.0 t/h with light oil
steam generation up to 32.0 t/h with natural gas

Based on a furnace heat input of 18.0 MW with light fuel oil and 23.4 MW with natural gas, in accordance with the 97/23/EG (pressure equipment directive) and EN 12953, steam ratings of up to 25.0 t/h respectively 32.0 t/h, steam can be achieved, although this requires a state–of-the-art exhaust gas heat recovery system.

For the generation of superheated steam the SCHNEIDER-Three Pass Boilers are equipped with superheaters. Depending on the requested steam temperature the superheater is installed either in the front reversing chamber (steam dryer) or in the rear reversing chamber (superheater).
The SCHNEIDER-Three Pass Boiler is equipped with a total built in 100% water cooled and gas tight rear reversing chamber (wet back design).

SCHNEIDER-Three Pass Boilers | series HDO-D


High pressure steam generators in double flame-tube design


steam generation up to 50.0 t/h with light oil
steam generation up to 64.0 t/h with natural gas

The SCHNEIDER-Three Pass Boiler HDO-D supplements the single flame-tube boilers in the higher performance range. The double flame-tube design offers economic steam generation requiring a relatively small space for installation.
The special feature of the SCHNEIDER-Three Pass Boiler HDO-D double flame-tube design is the complete separation of the two combustion parts. The flue gas of the two burners flows, separated from each other, from the furnace through the smoke tube passes into the outlet chamber. Separation walls in both reversing chambers and the outlet chamber avoid any interference of the two flue gas flows. This is a basic requirement for faultless and low-pollution combustion and it also permits single flame tube operation.