What is the effect of high feedwater temperature on boiler operations?

High feedwater temperature has several significant impacts on boiler operations, leading to improved efficiency and reduced risks associated with thermal shock. When the feedwater is heated before it enters the boiler, it helps maintain a more uniform temperature throughout the system. This uniformity minimizes thermal stress on the boiler components, resulting in a decreased risk of thermal shock, which can occur if cold water is introduced into a hot system.

Additionally, a higher feedwater temperature helps to enhance the overall efficiency of the boiler. When the water enters the boiler at a higher temperature, it requires less additional energy to reach the desired steam temperature and pressure. This efficiency translates to better fuel economy and more effective heat transfer, ultimately leading to reduced operational costs. Moreover, maintaining higher temperature feedwater supports steam generation without significant heat losses, further optimizing the performance of the boiler system.

In conclusion, the correct choice reflects a critical operational principle of boilers where managing feedwater temperature effectively can lead to improved efficiency while minimizing the potential for damaging thermal stresses.