Boiler drum
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Why is it said that the drum is the place where vaporization occurs? Isn’t it a water wall? ? And where does the pressure in the drum come from? ? ?
Vaporization mainly occurs at the vapor-liquid interface, and there is a limit to the degree of vaporization on the water wall; I’ve forgotten exactly what that limit is, but it exists to prevent tube failure due to insufficient heat transfer. The pressure gauge on the drum is connected directly to the steam space of the drum.
Vaporization occurs only when there is a gas-liquid interface; the water wall serves merely as a heat absorption area
In that case, the water in the water wall vaporizes under the pressure in the drum, and then the mixture of steam and water from the water wall returns to the drum; the steam stays at the upper part of the drum while the saturated water remains in the lower part? ?
The pressure inside the drum comes from the steam-water mixture contained within it, and this steam-water mixture originates from the membrane wall. The membrane wall provides the drum pressure. The steam-water mixture inside the membrane wall enters the drum, where it is separated into saturated steam and saturated water. To use an analogy, \"Since the creation of the world, the clear and light elements became heaven, while the turbid and heavy elements became earth.\" In this context, heaven represents steam – it is clear and light, which is why it rises upward to form heaven. What forms the earth is water; it is heavy and turbid, hence it descends to form the earth. Since the creation of heaven and earth, there is nothing else! Heat drives movement.
The explanation on the 5th floor is perfect. Additionally, a steam separator is usually installed inside the drum to prevent steam from carrying water into the pipelines or gas-using equipment.
So how does the drum separate the steam-water mixture into saturated steam and saturated water? ? ?
The steam inside the drum rises automatically, passing through the water layer present in the drum. The drum is equipped with steam-water separation equipment, which further separates the water carried by the steam, thereby increasing the dryness of the steam.