Which two types of fuel are commonly used in boiler operations?

In boiler operations, natural gas and oil are among the most widely utilized fuels due to their efficiency and the infrastructure available for their use. Natural gas is favored in many installations because it burns cleanly, producing fewer emissions compared to solid fuels like coal, and can be delivered via pipelines, allowing for a steady and reliable supply. Oil is also a common choice, particularly in areas where natural gas isn't readily available, and it can be stored easily for longer periods.

Both fuels can be used in different types of boilers and allow for precise control over combustion processes, which is crucial for maintaining efficiency and safety in steam production. The choice of these fuels also reflects the trend towards cleaner and more environmentally friendly energy sources in industrial applications.

The other fuel types listed, such as coal and wood, have seen a decline in use in many regions due to regulatory changes aimed at reducing emissions, while electricity and propane are less common for large-scale boiler operations in industrial contexts compared to natural gas and oil. Diesel and kerosene, although used in some specialty applications, do not match the widespread use and practicality of natural gas and oil in boiler systems.