Numerical Study Effect using Low Rank Coal on Flow Characteristics, Combustion and Furnace Exit Gas Temperature on Tangentially-Fired Pulverized Coal Boiler 350 MW

Putra, Arief Laga (2021) Numerical Study Effect using Low Rank Coal on Flow Characteristics, Combustion and Furnace Exit Gas Temperature on Tangentially-Fired Pulverized Coal Boiler 350 MW. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Coal combustion of a tangentially-fired boiler is influenced by time, temperature and turbulence as well as the oxygen sufficiency of combustion air. Low calorific coal design boiler, which contain high moisture so that it requires sufficient primary air for drying in the pulverizer output pipe before being put into furnace through coal burner at every corner and elevation installed. The ratio of the primary air to pulverized coal mass flow rate will affect the velocity of gas-solid particles that enter the furnace so that it has an impact on flow turbulence. The furnace exit gas temperature which is too high is avoided so that the combustion process does not occured outside the end limit of furnace path so that the formation of slagging in the convection area can be avoided.
This study will analyze several factors that have a significant effect on combustion using the CFD ANSYS FLUENT simulation software. In order for the implementation of the study to take place in a directed manner in accordance with the expected goals and targets, some boundaries are set as follows: the flow is assumed to be steady and turbulent. The object is the Tanjung Awar Awar Coal Fired Power Plant boiler with a capacity of 350 MWe, tangentially-fired pulverized coal boiler, operating conditions are the maximum continuous rate (MCR), operating data used is the commissioning or performance test, coal uses low rank coal and coal properties testing has been carried out in the laboratory. The ratio of the primary air to the pulverized coal mass flow rate studied were: 1.8; 2.0; 2.2.
The result showed that with increase the ratio of the primary air mass flow rate to the pulverized coal mass flow rate (PA/PC), the combustion temperature and the average velocity at the burner elevation increased. The lowest average furnace exit gas temperature was obtained at the PA/PC ratio: 2.0 of 1,379 °C. The operating pattern of using low rank coal (LRC) can be implemented continuously.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Primary Air - Coal flow Ratio, Low Rank Coal, Tangential Firing, computational fluid dynamic (CFD)
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Industrial Engineering > 26101-(S2) Master Thesis
Depositing User:	Arief Laga Putra
Date Deposited:	27 Aug 2021 01:19
Last Modified:	27 Aug 2021 01:19
URI:	http://repository.its.ac.id/id/eprint/90579

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