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1. Load on the electric steam generator plays a crucial role in steam quality. When the load increases, meaning more steam is produced per hour within the steam generator's unit space, the velocity of steam inside the boiler drum accelerates. This heightened speed can effectively lift small droplets suspended on the water surface, leading to degraded steam quality. This issue becomes particularly problematic during load fluctuations or overload conditions—even when the salinity of the boiler water isn’t excessively high—resulting in significant instances of steam-water carryover.
2. Pressure changes within the steam generator also impact steam quality. A sudden drop in pressure causes the volume of steam for the same mass to expand, increasing the volume of steam passing through the unit space. These minute water droplets are then more easily carried along by the steam, affecting its purity.
3. The concentration of dissolved solids in the boiler water is another key factor. Boiling water in the steam generator contains numerous bubbles. As these bubbles rise and burst at the water’s surface, they release countless tiny droplets. Under normal conditions where the boiler water concentration is low and other parameters like water level, load, and pressure remain stable, these droplets aren't easily swept away by the steam in large quantities. However, as the concentration of the boiler water increases due to continuous evaporation, the salinity rises, and the surface tension of the water intensifies. This leads to the formation of thick foam layers atop the boiling water. With higher concentrations, the foam thickens further, reducing the available space in the drum. Consequently, when the bubbles burst, the resulting fine droplets are more likely to be carried upward by the steam, degrading its quality. In extreme cases, this can lead to a surge of steam and water together, carrying significant amounts of boiler water along with it.
4. The water level in the steam generator also significantly affects steam quality. If the water level is too high, the available steam space in the boiler drum diminishes, increasing the density of steam passing through the unit volume and raising the steam velocity. Additionally, the separation space for droplets becomes limited, making it easier for droplets to be carried along with the steam, worsening the steam quality. Fluctuations in the water level can also cause instantaneous steam carryover, further impacting steam purity.
In conclusion, maintaining optimal conditions for all these factors—load, pressure, water concentration, and water level—is essential to ensure the quality and reliability of steam production in an electric steam generator.