Which of the Following Is Not a "Clean Coal" Technology

question 4

Multiple Choice

Which of the following is not a "clean coal" technology already in use?

• A)"Coal washing" to remove sulfur and other mineral impurities from the coal before it is burned.
• B)"Gasification" to convert coal to a mixture of carbon monoxide and hydrogen.The resulting gas burns at a lower temperature,thus reducing the generation of nitrogen oxides.
• C)"Wet scrubbing" to chemically remove SO₂ before it goes up the smokestack.This is accomplished by reacting the SO₂ with a mixture of ground limestone and water.
• D)"Sequestration" to capture and store CO₂ before it is emitted into the atmosphere.

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Definitions:

Specific Heat

The amount of heat per unit mass required to raise the temperature of a substance by one degree Celsius.

Specific Heats

The amount of heat per unit mass required to raise the temperature of a substance by one degree Celsius, a physical property that varies among different substances.

Copper, Aluminum

Copper is a reddish metal with high electrical and thermal conductivity, while aluminum is a silvery-white, soft, non-magnetic metal, both widely used in various applications.

Concrete

A building material made from a mixture of cement, aggregate (such as sand or gravel), and water, which hardens over time.