What is the maximum temperature differential between feedwater and the metal during boiler drying?

The maximum temperature differential between feedwater and the metal during boiler drying is crucial for ensuring that the boiler components do not experience thermal shock or damage. When drying a boiler, it is important to manage the temperature differential to prevent the metal from expanding too rapidly, which can lead to cracking or other structural failures.

A temperature differential of 40℃ is considered safe and effective for most boiler systems. This limit allows for sufficient heating of the metal surfaces while ensuring that the feedwater temperature remains low enough to minimize the risk of overheating and subsequent damage.

In the context of boiler operation, keeping the differential within the specified range helps maintain the integrity of the metal and assures a gradual transition as the system heats up. This practice is part of standard operating procedures for power engineers, contributing to the overall reliability and safety of the boiler system.