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Integrating Gas Turbines with Cracking Heaters - Impact on Emissions and Energy Efficiency
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Date
2011
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Publisher
Energy Systems Laboratory (http://esl.tamu.edu)
Texas A&M University (http://www.tamu.edu)
Texas A&M University (http://www.tamu.edu)
Abstract
Turbine Exhaust Gas (TEG) contains high levels of
oxygen, typically 15 vol. percent, due to gas turbine blade
material temperature limits. As such it can be used as
an oxidant for combustion in cracking furnaces and
reformers. Its high temperature and flow rate results
in a significant reduction of fuel consumption of the
furnaces while increasing the high pressure steam
production. The resulting high combined energy
efficiency makes this an attractive option when
energy costs are high.
This paper will discuss some of the theoretical
considerations of NOx formation, and correlate
differences between air and TEG firing with adiabatic
flame temperature and oxygen concentration.
In order to validate emissions predictions an
industrial-scale test was conducted at the John Zink
Test Facility with two floor burners operating with
TEG. The results were compared with ambient air
tests and show good agreement with the predictions.
They also give some insight if and when reburn of
NO is significant.
Description
Keywords
Gas Turbines, Cracking Heaters, Energy Efficiency