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2. Coal Burner :
https://www.assignmentpoint.com/science/chemistry/coal-burner.html
• A coal burner is mainly composed of a pulverized coal machine, a host of combustion machines (including a combustion
chamber, automatic back and forth motion system, automatic rotation system, the combustion air supply system) control
system, an ignition system, the crater, and others.
• In the worksite, a coal burner works with the coal pulverizer and coal hopper usually. The coal in the hopper is
conveyed to the coal pulverizer by a screw conveyor. The coal pulverizer will crush the coal into pulverized coal.
Water is heated, turns into steam, and spins a steam turbine, which drives an electrical generator. In the coal burner,
the pulverized coal mixes with air (High-speed airflow is generated by the draft fan on the coal burner), and is ignited
by the oil-burning igniter. After it passes through the turbine (one to three-stage), the steam is condensed in a
condenser and recycled to where it was heated; this is known as a Rankine cycle.
• Ignition : There are mainly two ways to ignite the coal burner. The manual way and automatic way, no matter which
way it adopts, the coal burner often needs fuel (oil, gas, etc.) as the combustion medium. It is predominantly
adopted in large coal-fired utility boilers. The finer the grinding of coal, the more efficient its combustion. The
difference is that the high-energy ignition devices which generate sparks replace people’s hands. The heart of a
pulverized coal-fired boiler is the pulverizer, also known as the mill
• Use: Pulverized coal can be used as a reducing agent by injecting it through the tuyeres. Pulverized coal burners
have a wide range of uses in industrial production and daily life, such as providing heat for boilers, hot mix asphalt
plant, cement kiln, metal furnace, annealing, quenching furnace, precision casting shell burning furnace, melting
furnace, forging furnace and other heating furnace or kiln. Depending on speed pulverizers are classified as low-
speed, medium-speed, and high-speed mills. Pulverized coal burners may be located on the front or opposed walls
or in the corners of the furnace.

4. Sinosun

5. Requirements for coal
Mark of coal: bituminous coal;
Gross calorific value: ≥5000kcal/kg (≥ 20000kJ/kg);
Net calorific value: ≥4200kcal/kg;
Volatile matter: ≥25%; Ash Content: ≤10%; Total moisture: ≤35%;
Inherent moisture: ≤14%; Total sulphur: ≤1%;
Particle size: ≤20mm.
Note: These indexes are the lowest requirements for the coal, the better coal will be better at practice.

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Pulverized Coal Burners
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