Patent ID: 11921036
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G  C  F  Y | IPC F  G

Claim 18:
19. A control system for an industrial furnace comprising a processor, and a sensor assembly electronically communicating with said processor for sensing a velocity of at least part of a furnace combustion process off-gas flow, the sensor assembly comprising:
a first beam emitter/energy beam sensor pair comprising a first energy beam emitter operable to emit a respective energy beam through a first portion of the off-gas flow, and a first beam sensor positioned for receiving and sensing the energy beam emitted from the first energy beam emitter,
a second beam emitter/energy beam sensor pair comprising a second energy beam emitter operable to emit a respective energy beam through a second portion of the off-gas flow at a location spaced downstream from the first portion, and a second beam sensor positioned for receiving and sensing the energy beam emitted from the second energy beam emitter,
wherein each respective energy beam comprises beam energy having an absorption profile corresponding to an absorption profile of at least one target species component of said off-gas flow,
the first and second beam sensors operable to output electronic signals representative of the sensed energy beam to the processor, the processor including program instructions operable to:
correlate the electronic signals received from the first beam sensor to an absorption energy profile of at least one target gas species of said off-gas stream and identify a gas absorption signature of said off-gas flow at a first position,
correlate the electronic signals received from said second beam sensor to the absorption profile of the at least one target gas species of the off-gas stream and identify the occurrence of the gas absorption signature at a second position spaced from the first position, and
based at least in part on a time difference between the identification of the gas absorption signature at the first position and at the second position determine at least one of a flow velocity and/or a volume of at least part of the off-gas flow, and based on the determination, output of a control signal for at least one of a combustion process of the furnace and a downstream off-gas flow pollution control apparatus.