Which boiler type eliminates a significant amount of refractory material?

The bent tube boiler is designed with tubes that are bent to efficiently manage the flow of flue gases and water. This design eliminates a significant amount of refractory material compared to other boiler types. The bending of the tubes allows for a more compact design while maintaining structural integrity and heat exchange efficiency. Since the bent tube boiler relies heavily on water for cooling and does not require extensive refractory lining to protect surfaces from high temperatures, it effectively reduces the amount of refractory material needed.

Refractory material is typically used in boilers to insulate and protect structural components from extreme temperatures, but the bent tube configuration minimizes the need for such materials. This design not only lowers construction costs but also enhances overall efficiency by reducing heat losses associated with excessive refractory.

In contrast, other boiler types like vertical firetube, locomotive, or cast-iron boilers often require more refractory material for insulation or structural support, thereby increasing their complexity and weight. The bent tube boiler’s efficiency and reduced reliance on refractory materials make it advantageous for many modern applications.