Boiler operation failure often caused by: local overheating on tube wall, coal combustion on super heater area or flue gas temperature exceeding 900 C before entering super heater. For increasing its reliability, boiler should be operated by avoiding the causes. The present CFD simulation was performed by varying mean coal size (35 and 74 micron) and tilting angle (0 and -5 degree). The simulation was performed by maintaining operational boiler parameter, namely: coal flow rate 155 ton/hr, air flow rate 1180 ton/hr and Primary Air: Secondary Air (PA:SA)=0.53.The study was taken on 300 MW tangentially coal fired boiler at PLTU Pacitan. Simulation result shows that selection of coal size 74 micron gives best condition or high reliability since there is no local overheating, flue gas temperature maximum is 836 and all coal burn before entering super heater. On the other hand, selection of 35-micron coal size is not recommended since it causes local overheating on lower boiler area, flue gas temperature reaching 1100 C and 0.015% coal burn on super heater area. The variation of tilting angle gives small effect on the combustion.

1.
L.
Buresk
,
Influence of Coal Quality to the Boiler Efficiency and Opprtunity fot its Improvement
,
Fuel
vol.
43
, no.
1-4
,
2017
, pp.
59
65
2.
N.
Shapiro
,
Michael J.
Moran
and Howard,
Fundamentals of Engineering Thermodynamics
, 5th edition.
England
:
John Wiley & Sons Ltd
, The Atrium, Southern Gate, Chichester, West Sussex PO19 8SQ,
2006
3.
M.M
Rashidi
, et al,
Thermodynamic Analysis of a Steam Power Plant with Double Reheat and Feed Water Heater
.,
2014
,
Hindawi Publishing Corporation
, pp.
1
11
.
4.
Choi Choeng
Ryul
and
Kim Chang
Nyung
.,
2009
.
Numerical investigation on the flow, combustion and NOx emission characteristics in a 500 MWe tangentially fired pulverized-coal boiler
,
Fuel
88
(
2009
)
1720
1731
5.
Belosevic
Srdjan
,
Sijercic
Miroslav
,
Tucakovic
Dragan
,
Crnomarkovic
Nenad
,
A numerical study of a utility boiler tangentially-fired furnace under different operating conditions
.,
Fuel
87
(
2008
)
3331
3338
6.
Joo-Hyang
Yang
,
Jung-Eun A.
Kim
,
Jaehyun
Hong
,
Minsoo
Kim
,
Changkook
Ryu
,
Young Ju
Kim
,
Ho Young
Park
,
Se Hyun
Baek
,
Effect of detailed operating parameters on combustion in two 500-MWe coal-fired boilers of identical design
.,
Fuel
144
(
2015
),
145
156
.
7.
Bureau of Energy Efficiency, Energy Performance Assessment. Energy Performance Assessment of Boilers
,
2000
,
1
2
.
8.
Babcock
and
Wilcox
,
Burners and Combustion System for Pulverized Coal
,
2005
, Edition 41.
New York
:
The Babcock and Wilcox Company
9.
Asotani
T.
,
Yamashita
T.
,
Tominaga
H.
,
Uesugi
Y.
,
Itaya
Y.
,
Mori
S.
,
Prediction of ignition behavior in a tangentially fired pulverized coal boiler using CFD
,
Fuel
87
(
2008
)
482
490
.
10.
Srdjan
Belosevic
Ivan
Tomanovic
Nenad
Crnomarkovic
Aleksandar
Milicevic
,
Full-scale CFD investigation of gas-particleflow, interactions andcombustion in tangentiallyfired pulverized coal furnace
,
Energy
179
(
2019
),
1036
1053
.
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