Why do once-through boilers become unstable? [Basic Knowledge]

Is the rapid steam generation and instability caused by the same factor? An explanation of the structure of a once-through boiler.

■What is the structure of a once-through boiler? It is a type of boiler composed of pipes, where water is fed in from one side and steam is extracted from the other. It has a small water capacity, allowing for quick steam generation. Additionally, it is compact, requiring less installation space for the boiler. ■Why can it produce steam quickly? Having a small water capacity means there is less water to heat. The less water there is to warm, the quicker it can reach boiling and vaporization. Therefore, both water tube boilers and once-through boilers have the advantage of being able to produce steam relatively quickly compared to cylindrical boilers. ■Does this also make it unstable for the same reason? On the other hand, having a small water capacity means there is also less water reserve to maintain pressure and water level when the steam usage suddenly changes. As a result, pressure and water levels can fluctuate easily due to load variations, making operation more unstable, which requires quick control measures such as adjusting the feed water flow. ■Summary The same characteristic of having a "small water capacity" creates both the advantage of quick steam production and the disadvantage of potential operational instability. Please feel free to consult with us first.

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