Features:

1. Absorb the heat of low-temperature flue gas, reducing the exhaust gas temperature, and thus reducing smoke loss and save fuel.

2. Since the feed water is heated in the economizer before entering the steam drum, the heat absorption of the feed water on the heated surface is reduced, and the economizer can be used to replace the partially costly evaporating heating surface.

3. The temperature of the feed water is increased, so when it enteres the steam drum, the wall temperature difference is reduced, and the thermal stress is reduced accordingly to prolong the service life of the steam drum.

Precautions:

The failure of the large-capacity boiler economizer is mainly due to the leakage of the coil tube. Most of the leakage is caused by three reasons:

(1) Tube wall wear, (2) Poor weld quality, (3) Corrosion of the inner wall. There are also a few cases caused by other reasons, such as poor pipe material, cracks in the wall of the weld heat affected zone. Maintenance work should aim at eliminating these factors, grasp the inherent laws, and take preventive measures.