Heat Flux Investifation in the Operation Conditions of the Horizontal Deposition Probe in the Boilers

• Autorzy: Dyjakon A. , Cieplik M.
• Języki publikacji: EN

Abstrakty

EN

The variety of biomass fuels and their constantly increasing content in the coal/biomass co-combustion requires further and more sophisticated on-line diagnostic methods, which can help in the properties characterization and fuels selection in terms of the impact on slagging and fouling of the heat exchange surfaces phenomena. One of the possibilities for such characterization is application of a deposition probe equipped with special thermal resistance sensors. The main aim of such a deposition probe is collecting deposits formed during combustion and co-combustion of solid fuels (coal, biomass, sludges, wastes etc.) in the Pulverized Fuel (PF) or Fluidized Bed (FB) boilers while also measuring the heat flux from the flue gas through the surface of the probe, to the simulated steam. As a result, the extend of the slagging and fouling processes as well as their influence on heat exchange can be determined, which is very important from operational, economic and environmental point of view of the power plant. The deposition probe can be used both in the main combustion chamber (radiant heat exchange zone) and in the convective ducts (convective heat exchange zone). However, the application of the deposition probe in such wide range of the operating conditions requires a very careful calibration of the sensor sensitivity as well as estimation and determination of the requirements for its proper operation. Unfortunately, many parameters can influence the sensor sensitivity and, as a result, the quantitative and qualitative measurements. In the paper, the influence of the deposition probe temperature, cooling medium temperature and cooling medium flow on the sensor sensitivity is shown and discussed. The said data have been obtained from measurements performed using a dedicated experimental test set up, covering the full applicable range of operating conditions. The said tests revealed that the sensor sensitivity varies broadly and the factors of primary importance are the mass flow of the cooling air and the deposition probe temperature.

Słowa kluczowe

EN

biomass; boilers; heat flux

• Wydawca: Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archivum Combustionis
• Rocznik: 2010
• Tom: Vol. 30 nr 3
• Strony: 275--284
• Opis fizyczny: Bibliogr. 16 poz., rys., tab.

Twórcy

autor

Dyjakon A.

autor

Cieplik M.

• TU Delft, Faculty 3mE, Section Energy Technology, Leeghwaterstraat 44, 2628 CA Delft, The Netherlands,

Bibliografia

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