Why is a row of tubes sometimes left out of an HRT boiler?

Leaving a row of tubes out of a Heat Recovery Steam Generator (HRT boiler) can facilitate improved circulation within the system, which is crucial for reducing the risk of carryover. In boilers, carryover refers to the unintended transfer of water droplets along with steam, which can lead to pressure fluctuations, reduced efficiency, and potential damage to downstream equipment. By omitting a row of tubes, the flow dynamics within the boiler can be optimized, enhancing the movement of water and steam. This targeted modification helps ensure that the steam generated is of a higher quality and minimizes the amount of water that enters the steam lines, thereby promoting a more efficient heat exchange process and overall system performance. Effective circulation is vital to maintain the boiler's operational integrity and efficiency, making this choice impactful for boiler design and functionality.