What is the correct order for the flow of water to the steam drum?

The flow of water to the steam drum must follow a specific sequence to ensure the efficiency and safety of the steam system. The correct order begins with water being collected in the hot well, which serves as a reservoir for the boiler feedwater. From the hot well, the water is directed to the deaerator. The purpose of the deaerator is to remove any dissolved gases, such as oxygen and carbon dioxide, from the water, which could lead to corrosion in the boiler system.

Following the deaerator, the water is pumped to increase its pressure before it passes through heat exchangers. These heat exchangers raise the temperature of the water by capturing heat from the flue gases. After passing through the heat exchangers, the water goes through the economizer, which further increases the water temperature by capturing additional heat from the exhaust.

This flow sequence maximizes heat recovery and prepares the water adequately for boiling in the steam drum, where it will be converted to steam. Each step of this process is vital for the overall efficiency of the steam generating system, ensuring that the water is properly treated and at the appropriate temperature before reaching the steam drum.