What is priming in a boiler, and how can it be reduced?

Priming in a boiler refers to the phenomenon where water droplets are carried along with steam into the steam distribution system. This issue can lead to inefficiencies and potential damage in the system by introducing water into areas where only steam should be present.

The correct choice discusses the relationship between the amount of heat being applied to the boiler and the formation of steam. Lowering the firing rate reduces the amount of steam produced, which in turn minimizes the turbulence within the boiler. This turbulence can cause water to be lifted into the steam phase, resulting in priming. By carefully regulating the firing rate, operators can achieve a more stable steam production and effectively reduce the risks associated with priming.

In contrast to the other options, which don’t accurately address the mechanism of priming or suggest actions that would not effectively mitigate the problem, this choice highlights a direct approach to managing the operating conditions of the boiler to prevent water carryover alongside the steam.