Economizer recirculation door opening and closing can be divided into three stages to study, of course, the premise is the normal combustion of the furnace (oil or coal can be).
1. There is no flow in the economizer, this time should be opened.
2. Discontinuous flow in the economizer, this time should be based on the Sheung Shui situation, the Sheung Shui is closed, not the water is open. But the rules stipulate that in this case can always be opened, and did not do so detailed requirements. The reason is estimated to have little impact and frequent operation.
3. There is a continuous flow of water in the economizer, this time should be closed.
After the boiler continuous water, because the water supply through the economizer recirculation tube directly into the drum, reducing the local area of the boiler water temperature, affecting the soda separation and steam quality, and the recycling tube and the steam at the interface of the metal Temperature stress, a long time may produce cracks. In addition, it also affects the normal operation of the economizer, so that the economizer outlet temperature is too high, so in normal operation, the economizer must be closed door closed.