To provide a method with which it is possible to ascertain a gas concentration in a furnace rapidly, and to charge an amount of fuel and/or oxygen corresponding to the state within the furnace, and with which it is possible to reduce the device maintenance load. In order to solve the abovementioned problem, this method for analyzing components contained in flue exhaust gas of a furnace includes: a sampling step of collecting a portion of the flue exhaust gas from a flue; a dust removal step of using a centrifugal dust collecting device to separate out dust in the flue exhaust gas collected in the sampling step, to yield an analysis gas; a measuring step of measuring components in the analysis gas to obtain the concentration of carbon monoxide in the analysis gas; and an analysis gas discharging step of causing the analysis gas to be sucked by an ejector.

Systems for measuring a concentration of a target species include a first and second tunable diode laser generating laser light at a respective first and second wavelength each corresponding to respective absorption lines of the target species. A first optical fiber is optically coupled to the first tunable diode laser, and does not support a fundamental mode at the second wavelength. A second optical fiber is coupled to the second tunable diode laser and does not support a fundamental mode at the first wavelength. A fiber bundle includes respective distal ends of the first and second optical fibers, which are stripped of their respective coatings and arranged with their claddings adjacent to each other. A pitch head is configured to project respective optical beams from the fiber bundle through a measurement zone. A catch head located across the measurement zone receives the projected beams and directs them to a sensor.

A method for measuring a concentration of at least one target species includes generating first and second laser beams having respective first and second wavelengths each corresponding to respective absorption lines of the at least one target species. The method includes coupling the first and second laser beams to proximal ends of first and second fundamental modes of first and second optical waveguides, respectively. The method includes transmitting through a measurement zone, for a distal end of the first and second optical waveguides, a probe signal including the first and second laser beam. The method includes determining a first signal strength of the probe signal at the first wavelength and a second signal strength of the probe signal at the second wavelength, and determining, from the first signal strength and the second signal strength, a concentration of the at least one target species.

Sensing of gas species characteristics within a process chamber includes selectively projecting a beam of a first select lasing frequency therethough. The beam is optically coupled to a detector to detect a process transmission spectrum having an absorption dip at a select lasing frequency caused by a gas species characteristic. The beam is selectively projected through a fiber Bragg grating which is formed in an optical fiber core to partially reflect at least a portion of the beam of the first select lasing frequency while passing a remainder of the beam. The remainder of the beam has an FBG transmission spectrum mimicking the absorption dip at or near the select lasing frequency caused by a gas species characteristic of interest. It is optically coupled the detector. Outputs of the detector are monitored to compare the FBG transmission spectrum to any process transmission spectrum produced in the process chamber.

A small heating system is provided for the combustion of solid fuels, having: a gasification zone for generating combustion gas and a combustion zone for combusting combustion gas; a first blower for supplying primary air into the gasification zone; and a second blower for supplying secondary air into the combustion zone , wherein the first blower can be regulated depending on the desired output of the small heating system and/or the second blower can be regulated depending on a desired oxygen content in the exhaust air from the combustion zone.

A system for electronically controlling a vent damper for a gas oven.

A burner includes an atomizing chamber, a flame tube in front of the atomizing chamber adapted to direct combusting fuel introduced by the atomizing chamber along an interior of the flame tube, and a controller. The controller is programmed to independently control rate of fuel flow to the atomizing chamber, rate of atomizing air flow to the atomizing chamber, and rate of combustion air to the flame tub. The controller is also programmed to perform operations including regulating, based on output of a gas sensor, at least the rate of combustion air to the flame tube to substantially maintain a first predetermined amount of excess air in the flame tube.

To provide a method with which it is possible to ascertain a gas concentration in a furnace rapidly, and to charge an amount of fuel and/or oxygen corresponding to the state within the furnace, and with which it is possible to reduce the device maintenance load. In order to solve the abovementioned problem, this method for analyzing components contained in flue exhaust gas of a furnace includes: a sampling step of collecting a portion of the flue exhaust gas from a flue; a dust removal step of using a centrifugal dust collecting device to separate out dust in the flue exhaust gas collected in the sampling step, to yield an analysis gas; a measuring step of measuring components in the analysis gas to obtain the concentration of carbon monoxide in the analysis gas; and an analysis gas discharging step of causing the analysis gas to be sucked by an ejector.

A flue gas analyser for determining the efficiency of a burner burning a supply gas and producing a flue gas by: calculating an efficiency of the burner based on a detected amount of a first target gas in the flue gas and an expected amount of the first target gas in the flue gas; predicting an amount of a second target gas in the flue gas based on the efficiency of the burner; estimating a composition of the supply gas based on a detected amount of the second target gas in the flue gas and the predicted amount of the second target gas in the flue gas; and correcting the calculated efficiency of the burner based on the estimated composition of the supply gas.

A method for measuring a concentration of at least one target species includes generating first and second laser beams having respective first and second wavelengths each corresponding to respective absorption lines of the at least one target species. The method includes coupling the first and second laser beams to proximal ends of first and second fundamental modes of first and second optical waveguides, respectively. The method includes transmitting through a measurement zone, for a distal end of the first and second optical waveguides, a probe signal including the first and second laser beam. The method includes determining a first signal strength of the probe signal at the first wavelength and a second signal strength of the probe signal at the second wavelength, and determining, from the first signal strength and the second signal strength, a concentration of the at least one target species.