Energy Research Essay - Coal -- Energy Research Essays

Energy Research Essay - Coal First of all, coal can be classified in many different classes. One way is known as coal rank. Coal rank is a measure of degree of change (metamorphosis) from the peat stage. The ranks range from pocket-sized rank to high rank. These are called lignite, subituminous, bituminous, and anthracite. Heating value and sulfur content reach maximum values at the bituminous coal rank. This stage contains really important environmental implications. Low ranking coal (eg lignite) releases a smoky flame when ignited. Ignition is also easy. High rank coal (eg antracite) has a bully flame and difficult ignition. Coal contains minerals These are organic constituents derived from different parts of plants. An environmental analysis of coal shows it contain...