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As distinct from rice straw, rice husks come with numerous advantages—husks are
typically collected at the factory level, very dry and with very low moisture content, not
requiring preprocessing [
16
]. Nowadays, rice husks are widely applied as bedding in the
animal husbandry industry, mainly for poultry litter [
48
]. Globally, in the field of bioenergy,
a common procedure to obtain energy from rice husks is using thermochemical processes
as direct combustion, pyrolysis, gasification and liquefaction [
49
]. Various authors [
50
–
53
]
identified pyrolysis as the most promising and effective method to obtain energy and create
products like bio-char, bio-oil and pyrolysis gas. Manatura et al. [
54
] presented an exergy
analysis of combined torrefaction and gasification process on rice husks pellets.
3.2. Availability of Sugarcane Residual Biomass and Possibilities of Energy Use
The most important sugarcane producing regions in Vietnam could be seen in Table
4
.
As also mentioned by Bhattacharyya and Thang [
55
], they are Central Highlands, Northern
Central area and Central Coastal area. Production is according to the distribution of mills
across Vietnamese districts (Figure
3
). Based on Doanh [
56
], there are 36 mills under
operation in total. This number decreased in recent years. Fourteen mills are located in
the Central Highlands region and 11 mills are in the Northern Central area and Central
Coastal area region. By MARD [
12
], the sugarcane industry met numerous difficulties in
recent years. Recently, 17 of 36 factories faced the risk of equity, and the problem arose as a
result of the importation of cheap sugar from abroad.
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