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Online monitoring system of air distribution in pulverized coal-fired boiler based on numerical modeling

Żymełka P., Nabagło D., Janda T., Madejski P.

Archives of Thermodynamics

2017

Vol. 38, no. 4

109–-125

Balanced distribution of air in coal-fired boiler is one of the most important factors in the combustion process and is strongly connected to the overall system efficiency. Reliable and continuous information about combustion airﬂow and fuel rate is essential for achieving optimal stoichiometric ratio as well as efficient and safe operation of a boiler. Imbalances in air distribution result in reduced boiler efficiency, increased gas pollutant emission and operating problems, such as corrosion, slagging or fouling. Monitoring of air ﬂow trends in boiler is an effective method for further analysis and can help to appoint important dependences and start optimization actions. Accurate real-time monitoring of the air distribution in boiler can bring economical, environmental and operational benefits. The paper presents a novel concept for online monitoring system of air distribution in coal-ﬁred boiler based on real-time numerical calculations. The proposed mathematical model allows for identification of mass ﬂow rates of secondary air to individual burners and to overﬁre air (OFA) nozzles. Numerical models of air and flue gas system were developed using software for power plant simulation. The correctness of the developed model was verified and validated with the reference measurement values. The presented numerical model for real-time monitoring of air distribution is capable of giving continuous determination of the complete air flows based on available digital communication system (DCS) data.

Wielowariantowa analiza możliwości i celowości współspalania osadów ściekowych w kotłach pyłowych opalanych węglem. (Część I) Warunki współspalania w świetle zapisów prawnych

Nitarska A., Marcisz M.

Energetyka

2008

nr 10

701-705

Część I stanowi merytoryczne wprowadzenie do prezentacji tytułowej analizy - przypadku z praktyki eksperckiej Energopomiaru. W tej części scharakteryzowano zasoby i właściwości komunalnych osadów ściekowych w kraju. Przedstawiono podstawowe warunki i wymagania dotyczące procesów termicznego przekształcania osadów i wytwarzania energii, także jakości poprocesowych odpadów paleniskowych.

Part (I) is a substantive preface to presentation of the title analysis - one of Energopomiar expert practice cases. Characterized are resources and properties of municipal sewage sludge in our country. Presented are basic conditions and requirements concerning thermal processes of sewage sludge conversion and energy production as well as the quality of afterprocess furnace wastes.