TY - GEN
T1 - Fouling of heat exchanger tubes in pulverized-coal-fired combustion chambers
AU - Korytnyi, Efim
AU - Berman, Yuli
AU - Davidson, Boris
AU - Perelman, Miron
AU - Saveliev, Roman
AU - Bar-Ziv, Ezra
PY - 2008/12/1
Y1 - 2008/12/1
N2 - Fouling is a major concern in coal-fired power plants caused by fly ash deposit on the heat exchanger tubes that decreases the overall heat transfer coefficient to water-steam mixture. Fouling has been characterized by weakly bound-loose form, which may be removed by various methods, such as soot-blowing, blast, and sand blowing. We have carried out experimental and modeling work on fouling to develop a methodology by which the thermal conductivity of the ash deposit would be determined in a way similar to the fouling process prevailing in real systems. For that we used tubes identical in material, diameter and temperature to those used in many utility boilers. In the experimental work we placed a tube in an axially symmetric 50 kW furnace, and tested fouling from three coals, bituminous and sub-bituminous. We also developed a dynamic model for the prediction of the ash deposition growth and its heat resistance. Comparison of the model prediction and experimental results yielded satisfactory fit. Consequently, thermal resistance of heat exchanger tuber with ash deposit of those coals was determined.
AB - Fouling is a major concern in coal-fired power plants caused by fly ash deposit on the heat exchanger tubes that decreases the overall heat transfer coefficient to water-steam mixture. Fouling has been characterized by weakly bound-loose form, which may be removed by various methods, such as soot-blowing, blast, and sand blowing. We have carried out experimental and modeling work on fouling to develop a methodology by which the thermal conductivity of the ash deposit would be determined in a way similar to the fouling process prevailing in real systems. For that we used tubes identical in material, diameter and temperature to those used in many utility boilers. In the experimental work we placed a tube in an axially symmetric 50 kW furnace, and tested fouling from three coals, bituminous and sub-bituminous. We also developed a dynamic model for the prediction of the ash deposition growth and its heat resistance. Comparison of the model prediction and experimental results yielded satisfactory fit. Consequently, thermal resistance of heat exchanger tuber with ash deposit of those coals was determined.
UR - http://www.scopus.com/inward/record.url?scp=70349100078&partnerID=8YFLogxK
U2 - 10.1115/POWER2008-60044
DO - 10.1115/POWER2008-60044
M3 - Conference contribution
AN - SCOPUS:70349100078
SN - 9780791848326
T3 - American Society of Mechanical Engineers, Power Division (Publication) PWR
SP - 37
EP - 40
BT - Proceedings of the ASME Power Conference 2008
T2 - ASME Power Conference 2008
Y2 - 22 July 2008 through 24 July 2008
ER -