Engineering Thermodynamics
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that

Rankine cycle is hypothetical
A Rankine cycle receives heat at two places
Heat is supplied to water at temperature below the maximum temperature of the cycle
Carnot cycle can't work with saturated steam

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Engineering Thermodynamics
Producer gas is obtained by

Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing air and a large amount of steam over waste coal at about 650°C
Carbonization of bituminous coal
Passing steam over incandescent coke

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