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2021, vol. 76, br. 1, str. 43-49
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Uticaj višestepenog dovođenja vazduha po visini ložišta na procese u energetskom parnom kotlu TE Kostolac B
Impact of air stagging in furnace on processes in power steam boiler TPP Kostolac B
Ključne reči: energetski parni kotao; primarne mere; sistem proračuna; efikasnost
Keywords: power steam boiler; primary measures; calculation system; efficiency
Sažetak
U cilju dostizanja propisanih normi koncentracije azotnih oksida za velika ložišta na ugalj od 200 mg/Nm3 (u suvim gasovima na 6% O2) u termoelektrani Kostolac B, 2015. godine, primenjena je primarna mera višestepenog dovođenja vazduha po visini ložišta. U radu je prikazana analiza efekata modernizacije na rad parnog kotla u celini, proračunskim sprezanjem diferencijalnih matematičkih modela procesa sagorevanja čestica ugljenog praha, strujanja i zračenja produkata sagorevanja, kao i formiranja azotnih oksida sa integralnim termičkim i aerodinamičkim proračunskim procedurama. Ovakav proračunski sistem omogućava pouzdano predviđanje radnih karakteristika energetskih parnih kotlova i u uslovima neprojektnog - podstehiometrijskog sagorevanja. Primenom ovakvog pristupa kvalitet rada samog kotla moguće je proceniti sa aspekta efektivnog, efikasnog, sigurnog i ekološki prihvatljivog načina rada. Na osnovu navedenog izvršeni su proračuni parnog kotla bloka 1 TE Kostolac B za postojeći i reorganizovani sistem sagorevanja. U radu je prikazan uticaj većeg broja parametara na rad parnog kotla sa izvedenim konceptom primarnih mera.
Abstract
The European normatives prescribe the maximum content of 200 mg/Nm3 in dry flue gases with oxygen content of 6% for existing pulverized coal-fired power plants. In order to analyse the effects of applying some of the primary measures for NOx reduction on the overall steam boiler operation, calculational coupling of differential mathematical models has been applied. This calculation system enables reliable prediction of the performance of power steam boilers also in substoichiometric conditions, and the quality of the boiler operation can be described from the perspective of its effective, efficient, safe and ecological operation. In accorrdance to that, calculations of the steam boiler unit 1 TE Kostolac B have been carried out for the existing and the air staging combustion system. This paper presents an analysis of the influence of various parameters on the operation of the steam boiler with the application of primary measures.
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Reference
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