Energy Sources

Choose the Correct Answer

Correct Answer : Option a

Explanation
Statement 1 is correct: The hydrogen obtained from coal gasification can be used for various purposes such as making ammonia

Statement 2 is correct: Syngas produced through coal gasification is used in multiple industries, including fertilizer production, power generation, and chemical manufacturing.

Statement 3 is not correct: Gasification-based processes for power production characteristically result in much lower emissions of pollutants compared to conventional coal combustion. This can be traced to the fundamental difference between gasification and combustion: in combustion, air and fuel are mixed, combusted and then exhausted at near atmospheric pressure, while in gasification oxygen is normally supplied to the gasifiers and just enough fuel is combusted to provide the heat to gasify the rest. Since air contains a large amount of nitrogen along with trace amounts of other gases which are not necessary in the combustion reaction, combustion gases are much less dense than syngas produced from the same fuel. Pollutants in the combustion exhaust are therefore at much lower concentrations than the syngas, making them difficult to remove. Moreover, gasification is usually operated at high pressure (compared to combustion at near ambient).