Understanding Coal Types, Grades, and Waste Coal Recycling Technologies
This overview explores the various types of coal, including Anthracite, Bituminous, Sub-Bituminous, and Lignite, along with their energy content and ash composition. It highlights the average temperatures and carbon percentages of each coal type, emphasizing the importance of carbon as a key energy component. Additionally, we discuss the characteristics of waste coal mixtures, which typically contain limestone to control SO2 emissions during burning. The properties of waste coal ash, including its benign nature suitable for mine reclamation, are also covered.
Understanding Coal Types, Grades, and Waste Coal Recycling Technologies
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Presentation Transcript
Types of Coal Coal 2500Average Temperature Average = 7 % Ash, 93 % Carbon13,000 BTU Grades of Coal: Metric Anthracite Anthracite Bituminous Sub Bituminous Lignite Ranges Waste Coal 1700Average Temperature Average = 49 % Ash, 51 % Carbon5,000 BTU (4336) Ranges 96-97 Parts of Waste Coal and 3-4 Parts of Limestone Are added to produce the final mixture
CFB Waste Coal Mixture Waste Coal Coal Refuse 90 - 97 % Waste Coal Illite Kaolinite Pyrophylite Pyrite (Sulphur) Rutite Carbon Plus Limestone 3 - 10 % Limestone Limestone Added (All Rock 100% Ash) to control SO2 levels. Carbon is the key component that burns. Ash is the naturally occurring “rocks” elements found in the local area. When a “lump” of coal is burned the ash that remains is the rock elements (%) found in the lump of coal. The carbon burns off to produce energy.
CFB Environmental Controls AIR SO2 NO2 Mercury Opacity CO2 Stack/Chimney Fuel (Wood/Coal) ASH – (Beneficial Use) CFB Waste Coal Ash Monitored Controlled Elements Found in Carbon Burning (Coal) Process:1. Sulphur (SO2) – Limestone Control2. Nitrogen (NO2) – Low Temperature – More Oxygen 3. Mercury 4. Opacity (Particulates PM 10 – 5 – 2.5)5. CO2 6. Water (Cooling + Storm Water Controls) (+ 3% Limestone/Ash) CFB Ash Content The Waste Coal/Limestone Mixture is very alkaline ash with low permeability and benign chemical properties, making it safe and ideal for abandoned mine reclamation. CFB Ash Content The Waste Coal/Limestone Mixture is very alkaline ash with low permeability and benign chemical properties, making it safe and ideal for abandoned mine reclamation
