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Gas Turbine Once-Through Steam Generators (GT-OTSG)

Direct fired cogeneration

TIW WESTERN has the ability to design and manufacture a Once through Steam Generator utilizing the exhaust stream of a Gas Turbine Generator. 

These units have all the design features of a "Direct Fired" OTSG but instead of a combustion air blower, they utilize the exhaust of a gas turbine as an air supply to the register style burner. 

When compared to a "Direct Fired" OTSG, the GT-OTSG can improve both greenhouse gas emissions and reduce overall energy usage. Steam outputs are comparable with either design.

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Already a leader in the design and manufacturing of the Direct Fired Once Though Steam Generator, TIWW can also offer an adaptation of this design by coupling it to a gas turbine generator package.  This unit allows the customer to match plant electrical demands with steam required for SAGD applications.
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Using a register style burner, the OTSG can be designed to operate using the flue gas from a gas turbine as the combustion air source. The overall design of the OTSG is very similar to a direct fired unit less the supply of a forced draft fan. The oxygen rich flue gas from the gas turbine is directed to the burner where it is "re"-fired to single digit stack oxygen levels. The overall design of the OTSG is very similar to a direct fired unit less the supply of a forced draft fan.

The OTSG can be designed for a number of different gas turbine suppliers and outputs.

The optimum size range is in the sub-35 megawatt (MW) output. Scope of supply for this package is the same as for a direct fired unit, however gas turbine supply would be by the customer.