Page 96 - Biomass Gasification, Pyrolysis And Torrefaction Practical Design and Theory

74 Biomass Gasification, Pyrolysis and Torrefaction

The sulfur content of lignocellulosic biomass is exceptionally low, which
is a major advantage in its utilization in energy conversion when SO 2 emis-
sion is taken into account. To reduce SO 2 emission from the combustion of
sulfur-bearing fuels, such as fuel-oil, coal, and petcoke, one can use limestone.
Theoretically, for every mole of sulfur captured, only 1 mol of limestone

TABLE 3.10 Comparison of Ultimate Analysis (dry basis) of Some Biomass
and its Comparison with Other Fossil Fuels
C H N S O Ash HHV
(%) (%) (%) (%) (%) (%) (kJ/kg) Source
Maple 50.6 6.0 0.3 0 41.7 1.4 19,958 Tillman (1978)
Douglas fir 52.3 6.3 9.1 0 40.5 0.8 21,051 Tillman (1978)
Douglas fir 56.2 5.9 0 0 36.7 1.2 22,098 Tillman (1978)
(bark)
Redwood 53.5 5.9 0.1 0 40.3 0.2 21,028 Tillman (1978)
Redwood 53.4 6.0 39.9 0.1 0.1 0.6 21,314
waste
Sewage 29.2 3.8 4.1 0.7 19.9 42.1 16,000
sludge
Straw-rice 39.2 5.1 0.6 0.1 35.8 19.2 15,213 Tillman (1978)
Husk-rice 38.5 5.7 0.5 0 39.8 15.5 15,376 Tillman (1978)
SW 47.2 6.5 0 0 45.4 1.0 20,502 Wen et al. (1974)
Paper 43.4 5.8 0.3 0.2 44.3 6.0 17,613 Bowerman (1969)
MSW 47.6 6.0 1.2 0.3 32.9 12.0 19,879 Sanner et al. (1970)
Animal 42.7 5.5 2.4 0.3 31.3 17.8 17,167 Tillman (1978)
waste
Peat 54.5 5.1 1.65 0.45 33.09 5.2 21,230
Lignite 62.5 4.38 0.94 1.41 17.2 13.4 24,451 Bituminous Coal
Research (1974)
PRB coal 65.8 4.88 0.86 1.0 16.2 11.2 26,436 Probstein and Hicks
(2006), p. 14
Anthracite 83.7 1.9 0.9 0.7 10.5 2.3 27,656 Basu et al. (2000),
p. 25
Petcoke 82 0.5 0.7 0.8 10.0 6.0 28,377 Basu et al. (2000),
p. 25
Source: Reed (2002).Fuel