Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Compressed air before entering the combustion chamber is heated
Exhaust gases drive the compressor
Heated
Bled gas from turbine is heated and readmitted for complete expansion

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Compressors, Gas Turbines and Jet Engines
Producer gas is produced by

Passing air and a large amount of steam over waste coal at about 65°C
Carbonisation of coal
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke

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