A method for operating a combustion chamber is provided. The method includes introducing a fuel into the combustion chamber via a plurality of nozzles, each nozzle having an associated stoichiometry for an output end of the nozzle. The method further includes measuring the stoichiometry of each nozzle via one or more sensors to obtain stoichiometric data, and determining that at least one of a frequency and an amplitude of spectral line fluctuations derived from the stoichiometric data has exceeded a threshold. The method further includes adjusting the stoichiometry of at least one of the nozzles based at least in part on the stoichiometric data so as to maintain a flame stability of the combustion chamber.

An online pulverized coal concentration regulator is mounted at a front end of a pulverized coal pipe, and a pulverized coal concentration detector is arranged in the pipe. The regulator includes a control system, and an output of the concentration detector is connected with a signal input end of the control system. The regulator includes a top plate, a regulating rod, and a powder baffle plate. A mounting hole for fixedly mounting the front end of the pipe and a through hole for the powder baffle plate to penetrate through are arranged in the top plate, and a connector is arranged between the regulating rod and the powder baffle plate. The regulator includes a guider slidably connected with the powder baffle plate and fixedly connected with the top plate, and a diversion plate arranged on the top plate and slidably connected with the powder baffle plate.

A combustion system includes a combustion chamber, a plurality of fuel introduction locations in the combustion chamber where fuel and air are provided to the combustion chamber for combustion, a fluid flow control device associated with each fuel introduction location, each fluid flow control device being controllable to vary an amount of the air supplied to each fuel introduction location, a plurality of sensing devices configured to monitor a plurality of operational parameters of the combustion system, and a control unit configured to control each fluid flow control device to control the amount of air supplied at each fuel introduction location independent of the amount of air supplied at the other fuel introduction locations, and to control the amount of air provided to all other air introduction locations, in dependence upon at least one of the plurality of operational parameters to minimize excess air provided to the combustion chamber.

A gas meter includes a flow rate measuring part configured to measure a flow rate of gas flowing through a flow passage, a shutoff valve configured to shut off the flow passage, a wireless communicator configured to periodically perform wireless communication externally, and a communication interval setting part configured to set a communication interval in the wireless communication. The communication interval setting part is configured to set the communication interval according to the flow rate of gas measured by flow rate measuring part.

A method, control unit and rotating machine for determining a fuel split setting value for adjusting a fuel split setting for a combustion device, the fuel split setting defining a relation between main fuel and pilot fuel. The method includes: retrieving a first information item correlated to heating value of supplied main fuel; retrieving a second information item correlated to combustor operating condition; retrieving at least one third information item representing stability of combustion; selecting a predefined pair of minimum and maximum boundary curves for the fuel split setting from a plurality of predefined pairs based on the first and second information items, the minimum and maximum boundary curves defining a band of fuel split settings permitted for a range of second information item values; determining the fuel split setting value within the selected pair of minimum and maximum boundary curves based on the third information item.

A combustion system includes: a combustor including a first combustion region and a second combustion region continuous with the first combustion region on a downstream side thereof; a first burner including an injection portion of ammonia as first fuel, the injection portion facing the first combustion region, and a first injection portion of second fuel not containing nitrogen atoms, the first injection portion facing the first combustion region; a second burner including a second injection portion of the second fuel, the second injection portion facing the second combustion region; and a control device that adjusts a second fuel flow rate ratio between a flow rate of the second fuel injected from the first injection portion and a flow rate of the second fuel injected from the second injection portion.