$1.$Describe the operational principles and differences between various coal burning equipments such as stokers and pulverized fuel burners. Detail the design and function of gas and oil burners used in industrial applications, focusing on how these systems are configured and regulated to optimize combustion and minimize pollutants.

Conclude by defining fluidized bed combustion and discussing its advantages over traditional combustion methods. Explain the environmental benefits of this technology and how it addresses common combustion$-$related emissions.