refractory dry-out is an important component of a boiler system, as it protects the equipment from intense heat by absorbing and distributing it evenly throughout the steam drums and superheater headers. If your facility fails to adhere to proper refractory dry out procedures, it can lead to decreased efficiency and even structural damage.

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Oftentimes, production pressures can result in shortcuts or rushed dry out processes that quickly compound issues such as thermal damage to the refractory materials and potential safety risks for personnel. As such, it is critical to follow all of the refractory dry out steps outlined in your company’s procedures.

The Refractory Dry Out Process

The refractory dry out procedure, also known as bake out, is a vital process after refractory installation before operations can begin. The goal is to remove both mechanical and chemical water from the refractory lining. Mechanical water is released as the refractory heats up, and chemical water is removed at the upper hold points using high-velocity gas burners.

In order for the refractory to achieve maximum strength, the temperature and temperature rate of rise must be controlled and maintained. A rapid increase in temperature is often the culprit of failure due to weakened areas within the refractory material walls. In addition, excessive moisture content can reduce the refractory’s ability to resist thermal stress.

A refractory dry out should be performed with the help of qualified professionals to ensure complete success. A high velocity gas burner is the preferred method for heating refractory to the appropriate temperature for drying and heat-up. The burners provide accurate and controllable rates of temperature rise in accordance with the refractory manufacturer’s curing and dry out schedules.