A boiler that employs moving furnace grates uses which type of fuel?

• A. Solid Fuel
• B. Liquid Fuel
• C. Gas Fuel
• D. Nuclear Fuel

Answer: (A)

The main idea here is that moving furnace grates are designed to burn solid fuels. A grate provides a solid surface for the fuel to sit on while air can pass from below, and the moving mechanism helps keep the fuel bed agitated, ensures good combustion, and carries ash away. This setup is typical for solid fuels such as coal or biomass, which require physical support and automatic ash removal as they burn.

Liquid fuels and gas fuels are handled differently—they burn on purpose-built burners that spray or mix the liquid or gas with air to create a flame, without a moving grate. Nuclear fuel isn’t used in conventional boilers at all; it involves a reactor core and different mechanisms for heat generation, not a grate-based combustion system.

So, a boiler with moving furnace grates is designed for solid fuels.