Cascaded steam temperature control applied to a universal pressure boiler
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United States of America Patent
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Jan 18, 1994
Grant Date -
N/A
app pub date -
Feb 5, 1993
filing date -
Feb 5, 1993
priority date (Note) -
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Abstract
The firing rate and the feedwater flow rate of a universal pressure boiler are controlled using a cascaded steam temperature control system. The secondary superheater outlet temperature comprises an outer loop for the control system, while the convection pass outlet temperature comprises an inner loop for the control system. Control variables for the system include the secondary superheater outlet temperature, the convection pass outlet temperature and the difference between the primary superheater outlet temperature and the secondary superheater inlet temperature.
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