What is the second pressure controller used in the High-Low fire control method called?

In the High-Low fire control method for boilers, the second pressure controller plays a crucial role in maintaining system safety and operability. This device is referred to as the Operating limit pressure control. Its primary function is to ensure that the operating pressure stays within safe limits, providing a level of redundancy in pressure management.

If the primary control system fails or if there is a deviation from the desired pressure, the operating limit pressure control acts as a safeguard to minimize the risk of overpressure situations that could lead to dangerous conditions. By continuously monitoring system pressure, this controller can automatically adjust the burner operation or other control elements to maintain optimal performance while preventing unsafe conditions.

This method is essential for maintaining operational efficiency and safety during varying loading conditions in a boiler system, thus demonstrating the importance of having robust control systems in place.