Biomedical Engineering Reference
In-Depth Information
Table 7
Overview of biomass gasification projects in China
Intensity, kg/(m 2
h)
Reactor
Power, kJ/
h
Use
Updraft fixed-bed biomass
gasifier
240
2,900
Heat production
180
1,600
Heating boiler
Downdraft
fixed-bed biomass gasifier
200
300
Tea drying
200
660
Wood drying
200
1,490
Gas boiler
200
1,000
Gas supply
200
2,000
Gas supply
637
900
Electricity production (30
kW)
510
920
Electricity production
Stratified downdraft
fixed-bed biomass gasifier
150
160 kW
Electricity production
150
60 kW
Electricity production
398
2-5 kW
Electricity production
Circulating fluidized bed
1,900
4,200
Gas boiler
2,000
67
Gas supply
1,000
160 kW
Electricity production
Internally circulating fluidized
bed
167
Gas supply
In China, studies on household dry anaerobic digesters started in the 1980s and
great progress has been made since then. Wu et al. [ 40 ] proposed a wet-dry
integrated digester and successfully applied it in the Huanghuaihai region to
achieve high gas production at low construction costs. Sun et al. [ 41 ] designed a
full-scale dry anaerobic digestion system, which consists of a sealed cylindrical
digester and cylindrical red mud plastic top cover digester. These digesters have
simple designs and need no daily feeding and discharge, thus they hold great
potential to be promoted in rural areas. Investigation of automatic discharge dry
digestion technology and related semi-continuous dry digestion technology was
initiated early in 1986 [ 42 ]. The automatic discharge technology was successfully
demonstrated at laboratory and pilot scales. This technology was approved by the
Ministry of Agriculture of China (MAC) in August 1988, and has been com-
mercially available since then. Ma et al. [ 43 ] designed a constant-pressure gas
separation tank dry anaerobic digester and successfully demonstrated it in
30 household projects. The gas production from such a system can basically meet
the energy needs for cooking and lighting of a family of four with two meals a day.
In addition, Kang et al. [ 44 ] also invented an efficient small-scale voltage-stabi-
lized automatic filtration dry anaerobic digester.
Studies of dry anaerobic digestion technology for large-scale application in
China began in the 21st century. Gan et al. [ 45 ] designed a horizontal stirred
digester equipped with a helical ribbon to treat livestock wastes and investigated
the operational parameters. Yan et al. [ 46 ] designed a heating and preserving
equipment for a livestock dry anaerobic treatment system, which can be used
for medium and large intensive farms. The optimum operational parameters
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