Review of Performance of Coal Gasification Using Measured Property

This paper addresses the question how coal gasification may be used more efficiently and economically than it
is being used today. coal already plays a large role in the energy supply, especially in developing countries,
analysis is done on different parameter such as moister content, heating value, fusion temperature, O/C ratio,
carbon capture, slurry feed & dry feed technology, literature review show that low rank coal contain high
inherent moisture & it require predrying of coal & its cost more. Technical bottlenecks (e.g. CO2 Emission) and
non-technical bottlenecks (e.g. cost of transportation of coal) are still hampering large-scale implementation.
A detailed explanation is given why coal gasification is more efficient than biomass co-fire gasification. The
gasification efficiency that can be achieved for different fuels, ranging from biomass to coal, is compared.
These fuels are distinguished by their atomic O/C and H/C ratios as shown in a Van Krevelen diagram. The
amount of oxygen to be added for complete gasification relative to the amount required for combustion is lower
for biomass than for coal. Consequently, a lower gasification temperature is theoretically required. However,
at practical gasification temperatures in the range of 1200 K to 1500 K, biomass becomes over-oxidized.
Furthermore, the chemical exergy of biomass is high relative to its heating value, but this work potential is not
fully utilized in the process. Review shows that how fusion temperature of coal affect the design of furnace in
heating plant or electricity generating plant, Costly redesign of furnace is necessary in order to adapt different
type of coal. Again study show that on 100% removal of exhaust gas 90% CO2 is removed. However potential
work is not done on the technology of (UGC &CCS) Underground coal gasification with CO2capture & storage
it will considerably reduce the transportation cost of coal. Again on the basis of fuel feed supply system dry fuel
feed system generates higher energy efficiency than slurry feed technology