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KUŠTRIN, I., GOSTINČAR, P.
REDUCTION OF NOX EMISSION BY SECONDARY-AIR REDISTRIBUTION
KOMUNALNA ENERGETIKA / POWER ENGINERING, 10
Till the beginning of 2008 NOx emission limit value for large solid-fuel-fired furnaces was 650 mg/m3. Since the beginning of 2008 it was lowered to 600 mg/m3 for large furnaces from 50 MW to 500 MW fuel-energy input. Since the beginning of 2016 only 200 mg/m3 of NOx will be allowed in flue gas emitted from furnaces between 300 MW in 500 MW of fuel-energy input. This level of NOx emissions can in most cases be attained by combination of primary and secondary measures for NOx reduction. NOx formation is targeted by primary measures while secondary measures are used for NOx removal from flue gas.
The goal of the paper is to present the enhancements of primary measures on boiler 3 of Power plant Ljubljana. This enhancements cover redistribution of secondary air between respective burner nozzles. Currently the redistribution enabled operation of boiler 3 with emissions below the future limit value of 200 mg/m3.
KUŠTRIN, I., LENART, J., KOKOVNIK, A., GOSTINČAR, P., HOČEVAR, M.
COMBUSTION OPTIMIZATION WITH RESPECT TO COAL-DUST DISTRIBUTION BETWEEN BURNER NOZZLES
KOMUNALNA ENERGETIKA / POWER ENGINERING, 19
Any combustion should be optimized as much as possible to reduce specific fuel consumption and emissions of harmful substances to environment. Optimization of pulverized coal combustion is a complex task. Coal mills are also fans for pneumatic transport of coal particles to burners. Every mill supplies coal dust to two, three or four nozzles of the same burner. Due to large dimensions and complex geometry of mill and coal dust ducts and stochastic milling process it is practically impossible to evenly distribute coal dust between burner nozzles. It is easier to distribute combustion air according to actual coal distribution which is constantly changing. Coal distribution is affected by coal-feeder load, wear of main mill components and coal properties.
Paper deals with the method for continuous measurement of coal distribution in coal dust ducts after the mills. Electrostatic discharge sensors are applied.
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