Pressurized fluidized-bed combustion part-load behavior. Volume I. Summary report Page: 109 of 122
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Table 12. Response rate investigations - Comparison of
Measured and Calculated Time Constants
Test 1
Test 2
Test 3/1
Test 3/2
Test 3/3
Mass of bed
Id
2054
1328
889
1109
1842
Specific heat of bed
Btu/Ib °R
0.305
0.301
0.304
0.301
0.309
Mass of uncooled tubes
lb
687
301
189
155
668
Specific heat of tube material
Btu/lb°R
0.2
0.2
0.2
0.2
0.2
Five gas flew rate
lb/sec
2.76
3.11
2.88
1.95 :
2.78
Specific heat of flue gas
Btu/lb°R
0.286
0.281
0.286
0.281
0.286
Area of cooling surface -
ft2
34.67
57.6
38.52
41.09
38.52
Average overall heat
transfer coefficient
Btu/sec ft2 °R
0.015
0.014
0.014
0.013
0.015
Calculated time constant (T )
c
-sec
582
274
223
331
510
Measured time constant (T } -
m
sec
700
380
280
450
700
T /T
m—c
1.2
1.39
1.26
1.36
1.37
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Roberts, A. G.; Pillai, K. K.; Raven, P. & Wood, P. Pressurized fluidized-bed combustion part-load behavior. Volume I. Summary report, report, September 1, 1981; United States. (https://digital.library.unt.edu/ark:/67531/metadc1088075/m1/109/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.