Investigations on fouling rate in convective bundles of coal-fired boilers in relation to optimization of sootblower operation

Soft-computing models for soot-blowing optimization in coal-fired utility boilers

“…In general, they are based in a monitoring system of heat-flux transfer and temperature of certain points of the boiler [4][5][6][7][8]. So, the optimized strategies of soot-blowing are established according to certain dirty levels or temperature thresholds [9][10][11][12][13][14][15][16]. But published information about technical details is, unfortunately, very scarce.…”

Removal of gas-side particulate fouling layers by foreign particles as a function of flow direction

“…The direction of flow in case of Hupa's experiments [12] was downwards while in case of Kaiser et al [14] and Abd-Elhady et al [15] was upwards, which indicates that the flow direction with respect to gravity influences the position at which particulate fouling starts. Kalisz and Pronobis [16] found that particulate fouling at the economizer of a pulverized coal boiler, in which the gas flow is upwards, occurred at the downstream side of the tubes, while at the end of the process a little wedge at the upstream was observed. Nuntaphan and Kiatsiriroat [17] investigated the effect of fly ash deposit on the thermal performance of a cross flow heat exchanger having a set of spiral finned-tubes as a heat transfer surface [18,19].…”

An overview of problems and solutions for components subjected to fireside of boilers

“…It takes place as the suspended fly ash cools down along with flue gases [41]. Excessive fouling may lead to an increase in gas temperature and deposition rate which leads to continually changing conditions in the boiler, hence, reducing its efficiency [42]. Temperature variation for high temperature fouling lies in the range from 900 to 1300 °C, and for low temperature fouling, this range is from 300 to 900 °C [38].…”