Compressors, Gas Turbines and Jet Engines
Only rocket engines can be propelled to space because

These engines can work on several fuels
They have high propulsion efficiency
They can generate very high thrust
They are not air breathing engines

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

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

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