What is part of the fuel that cannot be burned referred to as?

The component of fuel that remains after combustion and cannot be burned is referred to as ash. During the burning process, the combustible material in the fuel reacts with oxygen, producing energy, gases, and solid residues. The solid residue that remains after the burning has ceased consists primarily of non-combustible minerals and elements that did not undergo a chemical transformation during combustion. This residue is what we identify as ash.

Understanding ash is important, especially in the context of energy production, because it can impact the efficiency of boilers and other combustion systems. High levels of ash can lead to build-up and blockages, affecting the overall operation of these systems. Additionally, ash composition can vary greatly depending on the type of fuel being burned, and analyzing ash can provide insights into the fuel quality and combustion efficiency. By knowing what remains after combustion, operators can make informed decisions regarding maintenance and operation to improve efficiency and sustainability in energy production.