What is the correct flow sequence for feed water to the steam drum?

The correct flow sequence for feed water to the steam drum involves starting with the deareator, which eliminates dissolved gases in the feed water such as oxygen and carbon dioxide that can cause corrosion in the boiler. After deareation, the water is then directed toward the boiler feed pump, where it is pressurized to ensure it can flow through the system to the boiler.

Following that, the pressurized water enters the feed water heater where it is preheated. This step is crucial because it improves overall efficiency by utilizing waste heat from the steam or flue gases, enhancing the thermal efficiency of the system. Once preheated, the water passes through the economizer, which further increases the temperature of the feed water using residual heat from exhaust gases before it finally reaches the steam drum.

In summary, the flow sequence for feed water to the steam drum starts with deareation, followed by pumping, heating, and economization, culminating in the introduction of the water to the steam drum. This sequence ensures that the feed water is treated effectively for optimal operation of the steam system.