Modeling of processes in utility steam boiler with air staging

Predmet istraživanja predstavlja razvoj proračunskog sistema koji obuhvata diferencijalni matematički model procesa u ložištu i integralni matematički model rada postrojenja sa međusobnim interakcijama, a sve u cilju procene rada energetskog parnog kotla u celini. Ovakav sistem omogućio je širi prikaz svih relevantnih stanja struja koje učestvuju u procesima energetskog parnog kotla na ugljeni prah. Potreba za ovakvim načinom istraživanja proistekla je iz činjenice da nije moguće posmatrati deo složenog postrojenja a pritom zanemariti njegovo sadejstvo sa ostatkom sistema u kome on funkcioniše, odnosno sa kojim čini celinu. Razvijeni metod je primenljiv za inverzne probleme procene radnog stanja kod postojećih postrojenja, kao i za one direktne, kako modifikacije postojećih tako i razvoja novih energetskih objekata. U sklopu razvoja proračunskog sistema predviđeno je definisanje matematičkog modela sagorevanja čestica ugljenog praha, strujanja i zračenja produkata sagorevanja, kao i podmodela formiranja i destrukcije azotnih oksida koji u korelaciji sa integralnim termičkim i aerodinamičkim proračunima omogućavaju formiranje sveobuhvatnog opisa pogonskog režima energetskog parnog kotla. Razvoj ovakvog proračunskog modela je značajan radi pouzdanog predviđanja performansi energetskih parnih kotlova. Kvalitet rada samog kotla koji je moguće proceniti primenom razvijenog sistema proračuna može se podeliti u grupe efektivnog, efikasnog, sigurnog i ekološki prihvatljivog rada. Ovakva analiza naročito je bitna s obzirom da rad kotla može imati presudan uticaj na raspoloživost i ekonomičnost celokupnog energetskog sistema čija je on komponenta...The subject of research is the development of a calculation system comprising a differential mathematical model of processes within the furnace and an integral mathematical operation model of plant with mutual interactions, with the aim of overall utility steam boiler operation assessment. Such system enabled a wider overview of all relevant flows involved in the processes of the utility steam boiler operating on pulverized coal. The need for such research originated from the fact that it is not possible to observe a part of a complex plant and disregard its joint action with the rest of the system, with which it forms a whole. The developed method is applicable to inverse problems of operation mode assessment at existing plants, as well as to direct problems both for modification of existing and development of new utility objects. Within the development of the programme system, it has been anticipated to define a mathematical model of pulverized coal particles combustion, flow and radiation of two-phase gas-particles mixture, as well as a submodel of nitrogen oxides formation and destruction, which, in correlation with integral thermal and aerodynamic calculations, allow the formation of a comprehensive description of the utility steam boiler operating regime. The development of such a calculation model is significant in the aim of reliable prediction of utility steam boilers’ performances. The operation quality of boilers that may be assessed by using the developed calculation system can be divided into groups of effective, efficient, safe and ecologically acceptable work. Such analysis is of particular importance due to the fact that boiler operation can have a decisive impact on the availability and cost of the entire energy conversion system of which it is a component..