Approximately 2.8 × 1010 m3 of methane is emitted per year to the atmosphere from coal mining activities around the world. Mitigation and utilization of the fugitive coal mine methane is very difficult because its concentration is very low and varies from 0.1% to1%, and the methane is contained in a large air flow rate of 150–400 m3/s. This paper overviews existing and developing technologies for the mitigation and utilization of the fugitive mine methane, and then presents research progress in developing an innovative lean burn catalytic turbine technology for fugitive methane mitigation and utilization. This turbine system can be powered with about 1% methane in air.
Corresponding Author(s):
SU Shi,Email:shi.su@csiro.au
引用本文:
. Progress in developing an innovative lean burn catalytic turbine technology for fugitive methane mitigation and utilization[J]. Frontiers in Energy, 2011, 5(2): 229-235.
Shi SU, Xinxiang YU. Progress in developing an innovative lean burn catalytic turbine technology for fugitive methane mitigation and utilization. Front Energ, 2011, 5(2): 229-235.
Gas turbine with a catalytic combustor and a recuperator
Recuperative gas turbine
Thermal
Gas turbine with a recuperative combustor and a recuperator
Porous burner
Thermal
Oxidation inside porous ceramics with heat exchanger
Biofilter
Biologic
Oxidation inside composts
Concentrator
N/A
Adsorption
Multi-stage fluidised/moving bed using adsorbent, and a desorber
Adsorption
Novel carbon fiber composites, activated carbon
Tab.1
Fig.2
Features
VAMCAT system
Conventional gas turbine system
Fuel source
Fugitive methane as a primary fuel
High quality fuels such as natural gas, diesel
Combustion type
Heterogeneous combustion on honeycomb monolithic catalysts
Homogeneous combustion, diffusion flame
Start-up combustor
A start-up combustor is required, or other start up method
Use its main combustor for the start-up
Cooling and dilute air
No
Yes
Fuel feed position
Within the air through the compressor
Fed into the combustor through nozzles
Flow area
Larger for compressor and turbine of the VAMCAT system than those of the conventional gas turbine system
Tab.2
Items
Value
Compressor pressure ratio
2.4
Compressor outlet temperature/K
390
Compressor outlet pressure/Pa
239532
Compressor consumption/(kJ·kg-1)
97.94
Recuperator outlet pressure on the air side/Pa
232346
Recuperator outlet temperature on the air side/K
835
Recuperator outlet enthalpy on the air side/(kJ·kg-1)
1090.62
Recuperator outlet temperature on the gas side/K
474
Catalytic combustor outlet pressure/Pa
220729
Temperature-rise of the catalytic combustor/K
230
Catalytic combustor outlet temperature/K
1065
Catalytic combustor outlet enthalpy/(kJ·kg-1)
1350.92
Turbine outlet temperature/K
911
Turbine output work/(kJ·kg-1)
175.54
Specific work/(kJ·kg-1)
77.60
Thermal efficiency/%
29.81
Tab.3
Fig.3
Fig.4
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