The steam pollution of steam boilers is caused by mechanical carrying and dissolving. There are water droplets in the saturated steam, and the water droplets contain impurities, that is, mechanically carried. Some impurities can be dissolved directly by steam, ie dissolved. The root cause of steam pollution is that the boiler feed water contains impurities.
1, pot water concentration
There are many bubbles in the boiling water in the boiler. When the bubbles rise and fall out of the water level, they will break down many small and scattered small water droplets. When the pot water concentration is low and the boiler water level, load, and pressure are normal and stable, these small water droplets are not easily taken away by the steam. Because the water droplets themselves have a certain weight, they will sway back into the water when they splash out of the water and rise to a certain height.
When the pot water is continuously evaporated and concentrated, the salt concentration of the pot water gradually increases. The surface tension of the pot water is also increasing, and a large amount of foam layer is generated on the surface of the pot boiling water. As the pot water concentration increases, the thickness of the bubbles also increases. The effective space of the drum is reduced, and the fine water droplets splashed when the bubble bursts are easily taken out by the upward flowing steam, which deteriorates the steam quality. In severe cases, the steam and water coexistence phenomenon occurs, and a large amount of Pot of water.
2. Steam boiler load
If the steam boiler load increases, that is, the amount of steam per hour through the unit steam space in the boiler increases, the rising speed of the steam in the drum increases, and there is enough energy to bring out the highly dispersed water droplets on the water surface. To deteriorate the steam quality, especially when the load fluctuates or is overloaded, even if the salt concentration of the pot water is not large, the serious consequences of the soda water will occur.
3. Steam boiler water level
When the water level of the steam boiler is too high, the steam space of the drum will shrink, and the amount of steam passing through the corresponding unit volume will increase. The steam flow rate will increase, and the free separation space of the water droplets will shrink, which will cause the water droplets to be carried out with the steam. It will also deteriorate the steam quality, and the fluctuation of the water level will cause the steam to bring water instantaneously.
4, steam boiler pressure
When the pressure of the steam boiler drops suddenly, the volume of steam of the same mass increases, and the volume of steam passing through the volume per unit volume increases. In this way, fine water droplets are also easily taken out, which affects the quality of the steam.
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