What is the primary function of firetubes in steel plate heating boilers?

The primary function of firetubes in steel plate heating boilers is to provide heating surface area. Firetubes are designed to conduct heat from the hot gases produced during combustion. As these gases flow through the tubes, they transfer heat to the surrounding water or steam, which is contained in the boiler's shell. The larger the heating surface area provided by the firetubes, the more efficient the heat transfer will be, resulting in better heating of the water or steam within the boiler system.

This function is crucial because effective heat exchange is necessary for the boiler to perform its intended task—producing hot water or steam efficiently for heating or power generation purposes. By maximizing the surface area that is in contact with the hot gases, firetubes enhance the overall efficiency of the boiler operation, leading to reduced fuel consumption and improved performance.