First, why should the initial ignition of the boiler regularly discharge?
Answer: at this time for regular sewage, discharge is part of the water at the bottom of the circulation loop, so that impurities can be discharged, to ensure the quality of pot water;And the heat transfer loop of the weaker part of the heat strengthening, to prevent the local water circulation stagnation, so that the water circulation system components of the metal heating surface expansion uniform, reduce the temperature difference between the upper and lower walls of the drum.
Two. Why should the pressure boost speed still be controlled in the later stage of boiler start-up?
Answer: at this time, although the temperature difference between the upper and lower walls of the drum decreases gradually, the temperature difference between the inner and outer walls is still large and may even increase due to the thick metal of the drum wall.In addition, the stress in the drum is close to the working pressure in the later starting period, so the pressure boost speed should still be controlled in the later period to prevent the stress in the drum wall from increasing.
How to control the water level of drum in the process of boiler starting?
Answer: the boiler starting process, should according to the boiler working condition change control adjustment drum water level.At the beginning of ignition, the pot water is gradually heated, vaporized and expanded, making the water level rise. At this time, it is not easy to use the accident discharge gate to reduce the water level, but should be discharged from the regular discharge door, which can improve the quality of the pot water and promote the water circulation;With the increase of steam temperature and pressure, the amount of exhaust steam increases, the water supply should be supplemented in time according to the changing trend of drum water level;In the boiler flushing pipe or check the safety door, often due to the sudden increase of steam flow, steam pressure drop caused by serious "false water level" phenomenon, so before the above operation, should first maintain a low water level, and then according to the change of steam flow to increase the water supply, to prevent the safety door back seat and other reasons caused by the water level is too low;According to the boiler load, timely switch the feed water pipeline operation, and according to the specified conditions, into the feed water automatic.