What is the temperature at the economizer inlet?

The correct answer regarding the temperature at the economizer inlet being 254°C is based on standard operating conditions for economizers used in industrial heating systems. Economizers are designed to preheat the water entering the boiler by recovering heat from the flue gases that exit the boiler.

The bandwidth of temperatures that economizer inlets typically operate at depends on various factors, including the design of the heat exchanger and the type of fuel used. A temperature of 254°C represents a common operational point where the economizer efficiently raises the water temperature before it enters the boiler, enhancing the overall system efficiency by utilizing heat that would otherwise be lost.

Higher or lower temperatures, like 170°C, 280°C, or 320°C, may be atypical for economizer inlets under normal operating conditions, as they may either not utilize the flue gas heat effectively or operate outside safe design limits. Evaluating the specific design and application of the economizer can confirm the choice of 254°C as a practical temperature that achieves the goal of maximizing heat recovery while maintaining the equipment's operational integrity.