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Modern denitrification methods of coal fired boilers
 Nárovec, Jiří ; Houdek, Ing Milan (oponent) ; Skála, Zdeněk (vedoucí práce)
To fulfil strict NOx emission limits for large combustion plants it is nowadays necessary to equip existing boilers with denitrification techniques. This master’s thesis deals with denitrification of the existing 640 t•h-1 coal-fired boiler in Počerady power plant. The thesis contains background research of modern denitrification methods focused especially on secondary denitrification methods. Two variants for denitrification of the boiler are studied –variant 1 uses selective catalytic reduction (SCR) and variant 2 selective non-catalytic reduction (SNCR) supported by low NOx burners and over-fire air technology. An economic analysis of investment costs is carried out to find the suitable variant – variant 2 promises lower investment costs (by 19.4%). When comparing only SCR with SNCR, the SNCR method has 5 times lower investment costs. In accordance with investment costs, boiler dispositions and the difficulty of the installation, the second variant is chosen for further study. The next fundamental part of the thesis comprises the determination of suitable position for SNCR process. The determination contains a thermal calculation of the furnace and platen superheater for the fuel range within the load range of 60-100% of boiler maximum continuous rating (BMCR). According to the results of the calculation, two injecting levels of reagent were designed to ensure high effectiveness of the process within the considered boiler conditions. The last part of the thesis compares general applicability of SCR and SNCR installation in existing coal-fired boilers.
Úplný záznam
Modern denitrification methods of coal fired boilers
 Nárovec, Jiří ; Houdek, Ing Milan (oponent) ; Skála, Zdeněk (vedoucí práce)
To fulfil strict NOx emission limits for large combustion plants it is nowadays necessary to equip existing boilers with denitrification techniques. This master’s thesis deals with denitrification of the existing 640 t•h-1 coal-fired boiler in Počerady power plant. The thesis contains background research of modern denitrification methods focused especially on secondary denitrification methods. Two variants for denitrification of the boiler are studied –variant 1 uses selective catalytic reduction (SCR) and variant 2 selective non-catalytic reduction (SNCR) supported by low NOx burners and over-fire air technology. An economic analysis of investment costs is carried out to find the suitable variant – variant 2 promises lower investment costs (by 19.4%). When comparing only SCR with SNCR, the SNCR method has 5 times lower investment costs. In accordance with investment costs, boiler dispositions and the difficulty of the installation, the second variant is chosen for further study. The next fundamental part of the thesis comprises the determination of suitable position for SNCR process. The determination contains a thermal calculation of the furnace and platen superheater for the fuel range within the load range of 60-100% of boiler maximum continuous rating (BMCR). According to the results of the calculation, two injecting levels of reagent were designed to ensure high effectiveness of the process within the considered boiler conditions. The last part of the thesis compares general applicability of SCR and SNCR installation in existing coal-fired boilers.
Úplný záznam

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