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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.
SENEGAČNIK, A., KUŠTRIN, I., LENART, J., LEBAN, M., SEKAVČNIK, M.
FEASIBILITY STUDY OF COALMINE VENTILATION AIR METHANE UTILIZATION
KOMUNALNA ENERGETIKA / POWER ENGINERING, 11
During coal mining some dangerous and explosive gases are released. Due to safety reasons the mines should be intensively ventilated. Much of the released gas at coal mining is methane. Released gases are vented to surroundings with ventilation air and therefore the methane is not profitable used. One of the potential beneficial utilization of methane in ventilation air is the utilization as a power station air intake. This paper analyzes the possibility of using the ventilation air from the Velenje Coal Mine as an air intake for power plant Šoštanj Unit 5. The analysis shows that this utilization would have a positive effect in environmental and energy aspect.
KUŠTRIN, I., SENEGAČNIK, A., JAMŠEK, M.
HARMFUL EFFECTS OF AIR LEAKAGE INTO PULVERISED-COAL FIRED BOILER
KOMUNALNA ENERGETIKA / POWER ENGINERING, 18
The paper presents the reasons and consequences of uncontrolled air on the operation of steam boilers with dust firing i.e. combustion of coal crushed into powder. This type of combustion is more advanced than the combustion of solid fuels of larger granulation. It enables achieving higher output and efficiency. Several conditions must be fulfilled to enable quality combustion. One of these conditions is the optimum fuel to air ratio. This condition can be met if good control over the allocation of combustion air to the burner nozzles is possible. Usually it is possible to achieve from the perspective of installed measurement and control equipment but a major obstacle to this is an entry of uncontrolled air into the boiler. This makes it impossible to maintain optimum conditions for quality combustion.
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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