The calorific value of coal is a critical parameter that measures the energy content per unit mass (typically in kcal/kg, MJ/kg, or Btu/lb). In 2004, global coal resources were extensively studied, with varying calorific values depending on the type and quality of coal.
Key Coal Types and Their Calorific Values (2004 Estimates)
1. Anthracite (High-grade coal)
– Calorific Value: ~7,000–8,500 kcal/kg (29–35 MJ/kg)
– Low moisture & volatile matter, high carbon content.
2. Bituminous Coal (Most widely used)
– Calorific Value: ~5,500–7,000 kcal/kg (23–29 MJ/kg)
– Used in power generation and steel production.
3. Sub-bituminous Coal
– Calorific Value: ~4,500–5,500 kcal/kg (19–23 MJ/kg)
– Lower sulfur content, used in power plants.
4. Lignite (Brown Coal)
– Calorific Value: ~2,500–4,500 kcal/kg (10–19 MJ/kg)
– High moisture content, less efficient for energy.
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Global Coal Resources in 2004
– Total estimated recoverable coal reserves (~2004): ~1 trillion metric tons.
– Major reserves in the U.S., Russia, China, India, Australia.
– China was the largest producer (~2.2 billion tons/year in 2004).
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Factors Affecting Calorific Value
– Moisture content
– Ash content
– Carbon & volatile matter
Would you like specific data from a particular country or region in 2004?