What are the coal sizing requirements for a power plant?

The coal used in power plants needs to meet certain requirements depending on the type of power plant. Generally, coal should have a size range of 0.25-6 mm and be as dry as possible. It must also meet certain chemical and physical requirements such as calorific value, ash content, volatile matter content, and sulfur content.

The coal sizing requirements for a power plant depend on several factors, including the type of power plant, the combustion technology used, and the specific design and requirements of the plant. However, I can provide you with some general guidelines that are commonly followed in the industry.

1. Particle Size Distribution: The coal used in power plants is typically crushed into a fine powder to increase its surface area and facilitate combustion. The particle size distribution is important for efficient combustion and to ensure uniformity in the burning process. Most power plants require coal with a particle size ranging from 20 to 75 microns.
2. Pulverized Coal: Many modern power plants use pulverized coal combustion technology. In this process, coal is ground into a fine powder (usually 70% through 200 mesh, i.e., 74 microns) and then blown into the combustion chamber of the boiler. The pulverization process helps to maximize the surface area of the coal particles and ensures efficient and complete combustion.
3. Crushed Coal: Some power plants, especially older ones, may use crushed coal rather than pulverized coal. In this case, the coal is crushed into a smaller size, typically around 1 inch (25mm) or smaller, before being fed into the boiler.
4. Coal Quality: The quality of coal also plays a significant role in determining the sizing requirements. Different power plants may have specific requirements for the coal's heating value, ash content, moisture content, and volatile matter, among other factors. Coal with high-quality characteristics usually leads to better performance and efficiency.
5. Handling and Storage: The size of the coal may also be influenced by the handling and storage facilities available at the power plant. Coal must be stored in large silos or bunkers, and the size of the particles can affect the flow and storage characteristics.

It's important to note that these are general guidelines, and specific power plants may have unique requirements based on their design and operational parameters. As coal-fired power plants are being phased out or replaced by cleaner energy sources in many regions, the sizing requirements may evolve with the use of alternative fuels or technologies. Always refer to the power plant's engineering specifications or consult with experts in the field for precise and up-to-date information.

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