A pulverizer or grinder is a mechanical device for the grinding of many different types of materials. For example, a pulverizer mill is used to pulverize coal for combustion in the steam-generating furnaces of fossil fuel power plants.Power plant Klingenberg, BerlinPower plant Reuter-West, BerlinPower plant Reuter-West, BerlinSchwarze Pumpe power station A pulverizer or grinder is a mechanical device for the grinding of many different types of materials. For example, a pulverizer mill is used to pulverize coal for combustion in the steam-generating furnaces of fossil fuel power plants. Coal pulverizers may be classified by speed, as follows: