Arkansas Boiler Operator Practice Exam

What is the function of an economizer in a boiler system?

1. To increase the temperature of the steam

2. To recover waste heat from exhaust gases

3. To control the water level in the boiler

4. To enhance the combustion process

The correct answer is: To recover waste heat from exhaust gases

The function of an economizer in a boiler system primarily involves recovering waste heat from the exhaust gases. An economizer is a heat exchange device that utilizes the hot flue gases leaving the boiler to preheat the feedwater before it enters the boiler. This process minimizes energy loss by capturing heat that would otherwise be wasted, thus improving the overall efficiency of the boiler system. By increasing the temperature of the feedwater, less energy is required from the fuel to achieve the necessary heating within the boiler, leading to reduced operational costs and improved energy efficiency. In contrast, the other functions listed do not accurately describe the role of an economizer. Increasing the temperature of the steam is a result of the boiler's heating process and not directly related to the economizer. Controlling the water level is a function of the boiler's water level control systems, which ensure safe and efficient operation. Enhancing the combustion process pertains to burners and combustion management systems rather than the economizer's function in heat recovery.