Coal crusher is an important piece of equipment in the process of coal processing. It is used to crush coal into smaller size so that it can be used as fuel for boilers and other industrial equipment, and also used to make coke for steel production. The process of coal crusher involves the following steps:

1. Primary coal crusher: The first step in the coal crusher process is the primary coal crusher. It crushes the coal into smaller pieces by using a high-speed rotary impactor. This primary crusher reduces the size of the coal to 3-4 inches, which makes it easier to handle and transport.

2. Secondary coal crusher: After the primary crusher, coal is sent to the secondary crusher where it is further crushed into smaller pieces. The secondary crusher usually operates at a slower speed than the primary crusher and is used to crush coal that has been screened to a specific size.

3. Tertiary coal crusher: The tertiary coal crusher is the final stage in the coal crusher process. It reduces the coal to a uniform size of about 1/4 inch or less. This size is required for efficient combustion in the furnaces of the power plants.

4. Screening: After the coal is crushed, it is screened to separate the products into different sizes. The larger pieces of coal are sent back to the primary crusher for re-crushing, while smaller pieces of coal are sent to the power plant for use.

Coal crushers are of two types: primary and secondary crushers. Primary crushers are used for crushing larger coal into smaller particles. Secondary crushers are used for reducing the size of coal particles further down.

Coal crushers are also classified based on their capacity. Large and medium crushers are used for crushing coal in large-scale industries, while smaller crushers are used in small-scale industries.

Coal crushers are also classified based on the type of coal they can crush. The most common types are bituminous, lignite, and anthracite. Bituminous coal is the most widely used type of coal for industrial and power generation purposes, while lignite and anthracite are used in smaller quantities.

Hence, coal crusher plays a crucial role in the process of coal processing. It is a key piece of equipment that helps to reduce the size of coal particles for efficient combustion in power plants. The coal crusher process involves primary, secondary, and tertiary crushers, and screening. Therefore, it is important to choose the right type of coal crusher based on the specific needs of your industry.