During the operation of the low-pressure steam boiler, the water droplets in the drum are taken away by the saturated steam, mainly due to the poor water quality of the boiler and the improper operation of the boiler.
When this phenomenon occurs, the saturated steam carries a large amount of pot water, and the pot water dissolves a variety of salt substances, resulting in a significant deterioration of the steam quality, causing the following adverse effects:
1.The superheated steam line deposits salt scale, which can lead to production stoppage in severe cases.
2.The temperature of the superheated steam is significantly reduced, which reduces the efficiency of the low-pressure steam boilers and also causes waste of water and fuel.
3. Affect the production process conditions (such as insufficient heating temperature, etc.), resulting in unqualified product quality or reduced yield.
4. Materials or foods that come into direct contact with steam can be seriously polluted and become waste.
5.Caused a boiler accident. When the soda water is mixed, the liquid level is unclear, and the low-pressure steam boilers water level gauge is not displayed correctly, which may cause terrible boiler water shortage accidents (burning the pot plate or exploding).
6. Increase equipment maintenance and maintenance costs.
In order to prevent the above occurrences, we must start from the following aspects:
1.Control the water quality of boiler feed water. The content of impurities in the pot water is related to the water supply. The less the water supply impurities, the better the water quality of the pot water. In the process of evaporation and concentration of pot water, substances such as alkaline substances, silica, organic matter and oils in the feed water are prone to generate a foam layer, which increases the amount of steam.
2.Strengthen water and steam monitoring. The quality of boiler feed water, pot water and steam is only through daily water quality monitoring. In other words, water quality testing in boiler operation is essential. If there is no need for routine testing, it is difficult to make scientific judgments based on subjective guessing.
3.Timely adjustment of operating conditions. Boiler operating conditions (such as pressure, water level, load, etc.) have a great influence on preventing the co-existence of steam and water. It is mainly controlled by the operation of the furnace. Under the premise of ensuring the production of steam, the boiler operating pressure should not be raised too high; Under the premise of ensuring safe operation, the operating water level should not be too high, generally in the middle and low water level; The opening of the steam valve should not be too fast and too fast, and the boiler boost should be as gentle as possible.
4.Do a good job in boiler blowdown. The boiler discharge is to discharge the sediment in the pot water, that is, the water slag. The second is to discharge a part of the pot water with high salt content, and add new water supply to reduce the concentration of the pot water, prevent boiler fouling and generate steam and water.
Doing the above measures has important practical significance for ensuring efficient operation of low-pressure steam boilers, reducing equipment maintenance and extending equipment service life.