Once Through Steam Generators

For offshore applications BIH can offer a once through steam generation (OTSG) solution in which high pressure, high purity steam is generated from the turbine exhaust gases and despatched to a steam turbine.

OTSGs are lighter and more compact than conventional HRSGS and are a drum-less solution that is perfectly suited to the constraints of offshore installation. Without the thermal mass of the steam drum the start-up and shut-down times are much shorter compared with those of drum -based HRSGs and therefore more suited to the frequent cycling that may be encountered in offshore applications.

• Flow stabilisation measures to minimise the risk of flow instability occurring
• Integral exhaust gas bypass system enables greater capacity control and increases operating flexibility
• Possibility to design with multiple pressure levels and/or utility heating
• Vertical exhaust gas flow arrangement reducing the footprint of the unit.
• OTSG essentially maintenance free with operating runtimes dictated by Gas Turbine maintenance schedule
• Shorter construction time due to modular design and no need for interconnecting boiler piping

OTSGs can be offered for onshore applications but the more stringent water quality needed compared to drum-based HRSGs mean that they are better suited for heat recovery where higher steam parameters and reduced footprint is required.