How are boilers in multiple boiler heating plants typically operated?

In multiple boiler heating plants, the operation of the boilers is commonly organized in a sequential manner using a step controller. This method allows for the management of boiler operation based on the heating demand of the facility. When the heating load increases, the step controller can activate additional boilers sequentially, ensuring that the system meets the required heat output efficiently without overloading any single boiler.

By starting one boiler at a time, the system can maintain optimal operating conditions for each unit, prolonging their lifespan and enhancing overall efficiency. This method is particularly advantageous during varying load conditions, as it can reduce energy waste by only activating boilers as needed rather than operating all boilers simultaneously.

Simultaneous operation might lead to inefficiencies, especially if not all boilers are needed for the current demand. Operating in parallel by a manual controller would also not utilize the automation advantages provided by step controllers, while independent operation based on demand would complicate maintenance and efficiency management. Thus, sequential operation is the most effective method for ensuring that heating needs are met while controlling energy use and extending boiler life.