Abstract: An apparatus and method operable for the continuous monitoring of a gas stream including an optical sensor operable to monitor and/or measure Hg concentrations in a flue gas by calculating the absorbance of the ultraviolet light thereby at a range of wavelength 253.7 nm+/?0.05 nm. The apparatus therefore provides as a spectrally narrow UV light source, a mercury lamp. The spectrally broad UV light source includes a UV LED. A 2×2 coupler is provided to mix the narrow and broad UV light energy which is propagated through the gas stream. The invention recognizes that measurement of radiation absorption at the 254 nm+/?1.5 nm range will result in not only from Hg0, but also from the SO2 component in the flue gas. To compensate for sulphur dioxide, measurement of energy absorption for both specially narrow radiant energy in the 253.7 nm+/?0.

Abstract: An apparatus and method operable for the continuous monitoring of a gas stream including an optical sensor operable to monitor and/or measure Hg concentrations in a flue gas by calculating the absorbance of the ultraviolet light thereby at a range of wavelength 253.7 nm+/?0.05 nm. The apparatus therefore provides as a spectrally narrow UV light source, a mercury lamp. The spectrally broad UV light source includes a UV LED. A 2×2 coupler is provided to mix the narrow and broad UV light energy which is propagated through the gas stream. The invention recognizes that measurement of radiation absorption at the 254 nm+/?1.5 nm range will result in not only from Hg0, but also from the SO2 component in the flue gas. To compensate for sulphur dioxide, measurement of energy absorption for both specially narrow radiant energy in the 253.7 nm+/?0.

Abstract: This invention relates to a method and apparatus for improved process control in combustion applications, and particularly those relating to the steelmaking industry. An apparatus is provided for process control in a combustion application comprising a laser to transmit a near-infrared laser beam through off-gas produced by the combustion application, a detector to detect the transmitted laser beam and convert the detected laser beam to an electrical signal, and a control system for providing adjustment of select inputs to the combustion application in response to the electrical signal from the detector. The method of this invention comprises transmitting a near-infrared laser beam through off-gas produced by the combustion application, detecting the transmitted laser beam, and adjusting select inputs of the combustion application in response to the detected transmitted laser beam.

Abstract: This invention relates to a method and apparatus for improved process control in combustion applications, and particularly those relating to the steelmaking industry. An apparatus is provided for process control in a combustion application comprising a laser to transmit a near-infrared laser beam through off-gas produced by the combustion application, a detector to detect the transmitted laser beam and convert the detected laser beam to an electrical signal, and a control system for providing adjustment of select inputs to the combustion application in response to the electrical signal from the detector. The method of this invention comprises transmitting a near-infrared laser beam through off-gas produced by the combustion application, detecting the transmitted laser beam, and adjusting select inputs of the combustion application in response to the detected transmitted laser beam.