Theoretical Basis of Boiler Combustion

- Feb 14, 2019 -

1629223910(1) Composition of coal: In nature, coal is a mixture of various substances. Its main components are carbon, hydrogen, oxygen, nitrogen, sulfur, ash and water.

1. Carbon: Symbol C is the main component of coal. The more carbon the coal contains, the higher the calorific value. However, coal with higher carbon content is more difficult to ignite, because carbon can only be burned at higher temperatures. General carbon accounts for 50 90% of the fuel composition.

Coal is a mixture of many substances in nature. Its main components are carbon, hydrogen, oxygen, nitrogen, sulfur, ash and water.

1. Carbon: Symbol C is the main component of coal. The more carbon the coal contains, the higher the calorific value. But coal with higher carbon content is more difficult to ignite because carbon can only be burned at higher temperatures. General carbon accounts for about 50 90% of the fuel composition.

Hydrogen: Expressed by symbol H, it is the most active component in coal. The more the content of coal, the easier the fuel to ignite. The amount of hydrogen in coal is about 2%5%.

Sulphur: Symbol S is a harmful element in coal. Sulphur combustion produces sulfur dioxide (SO2) or sulfur trioxide (SO3) gases, which pollute the atmosphere and are harmful to human health. These gases, in turn, combine with water droplets condensed on the heating surface of the flue gas to form sulfite (H2SO3) or sulfuric acid (H2SO4) to corrode metals. Moreover, sulfur-containing flue gas discharged into the atmosphere will also cause environmental pollution. Coal with more sulfur is prone to spontaneous combustion. The content of coal in China is 0.5_5%.

Coal combustion

(1) Conditions for complete combustion of coal 1. Appropriate amount of air 2. Certain combustion temperature 3. Mixing uniformity of fuel and air 4. Full combustion time

(2) Coal combustion process 3. Fixed carbon ignition combustion 4. Fixed carbon combustion and ash formation. 1. Preheating and drying 2. Volatile analysis and ignition


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