Which type of incinerator uses graded silica?

The type of incinerator that uses graded silica is a fluidized bed incinerator. In a fluidized bed system, granular materials such as graded silica are employed to enhance the combustion process. These materials help create a fluid-like behavior when air is blown through them, allowing for more uniform heating and better mixing of solid waste. This results in more efficient combustion due to increased contact between the waste and the air needed for burning.

Fluidized bed incinerators are particularly advantageous for certain types of waste because they can accommodate variable feed rates and have better control of combustion temperatures. This leads to improved efficiency and minimizes the release of air pollutants. The use of graded silica aids in maintaining the fluidization and ensuring that the waste is adequately processed in the combustion chamber.

Other types of incinerators, such as induced draft, double stack, and multiple-hearth systems, work on different principles that do not involve the use of graded silica in the same way. Induced draft systems primarily rely on a fan to draw flue gases, double stack systems use two separate combustion stacks, and multiple-hearth systems utilize a series of hearths for combustion rather than the fluidized approach seen in fluidized bed incinerators.