Abstract

As electric demand increasing due to rapid economic growth, most developing country are sourcing for cheap fuel and low maintenance power plant which coal fired power plant become the more preferable plant. The cheap and abundant coal resources have played a major factor for coal power plant selection compare to other type of power plant. Although this plant type has low maintenance and operating cost but its emission of by product has a great effect on daily plant operation and environment. The one of the major emission was unburned carbon which by product of incomplete combustion where remaining of coal that unburned exits the furnaces with ash. Presence of higher percentage of unburned carbon indicates the low efficiency of furnace combustion and this directly affects financial status of the power plant operators. This condition causes severe damages on the boiler tube by formation of slagging and clinkering which reduces heat transfer and efficiency of the furnace. Current method proved to be more time consuming and plant operator facing difficulty to reduce unburned carbon in real time. As a solution for this problem, a best parameter was predicted to achieve low percentage of unburned carbon.

Highlights

  • Coal fired power plant has become Malaysia’s largest electric producer with commission of 5 plant in Manjung, Malaysia

  • Bottom ash used for ash that dropped into bottom of boiler or hopper and fly ash which flow together with flue gas to furnace outlet

  • Total 24 burner from 6 elevation used during normal operation while 1 used for back up during any required scenario inlet was located. This simulation was modelled using commercial Computational Fluid Dynamic (CFD) codes where Fluent was used for species mass fraction, enthalpy and momentum

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Summary

Introduction

Coal fired power plant has become Malaysia’s largest electric producer with commission of 5 plant in Manjung, Malaysia. There is incomplete combustion occurred when unburned carbon remaining mixed with fly ash and exits the furnace. This causes presence of higher percentage of unburned carbon level in fly ash and high amount. A DOE was carried out to determine the best combination of parameter that can be used to achieve lower percentage of unburned carbon in fly ash. This can be used in plant operation to control parameter to achieve desired parameter in short period of time [6]

CFD simulation
Validation result
DOE result
Conclusion
Full Text
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