Large fluctuations in steam pressure and the issue of steam carrying water
Thread Content
As the title says! Our coking plant relies on a low-pressure boiler to meet the steam demand of the entire facility (the steam produced by this low-pressure boiler is not used only for coking purposes, but also by other equipment). The steam pressure is increased prior to steam testing and minor and major purging, raising the steam pressure in the coking unit from the usual 0.6 MPa to around 0.8 MPa. Before switching the four-way valve (around 17:00), when increasing the steam pressure, it was evident that the steam contained a significant amount of water; water would sometimes flow out in bursts from the drain point of the special valve’s gas seal. When the temperature at the top of the heating tower was very high, it could drop from over 400 degrees Celsius to 320 degrees Celsius – since this special valve’s gas seal does not have orifice plates, the only way to prevent this phenomenon is by reducing the size of the gas seal, which allows the temperature to rise gradually. Moreover, after the four-way valve is switched, the steam water content becomes even more severe than before the switch. . . (The above phenomena are particularly evident when there is a large temperature difference between day and night). I would like to ask experts: why does fluctuation in steam pressure cause water carryover? Why does the water problem worsen after switching the four-way valve (this happens every time the tower is switched; it’s not accidental)? How can effective dehydration be achieved? (Suggestions for replacing the boiler can be left out-_-!, Are there any good suggestions regarding the operation method?) ):loveliness: The more professional the explanations from everyone here, the better
It might be due to the boiler being overloaded, resulting in poor water vapor separation; pressure fluctuations are more noticeable in such cases. I’m not sure whether a low-pressure boiler refers to the vaporization of oil in the middle section of a distillation tower, or to a dedicated oil furnace It is recommended to use other steam from the pipeline network to maintain operational stability ； The steam generation rate of the boiler remains stable; after being superheated, it is fed into the pipeline network ； The pressure fluctuations in steam generation caused by the size of the equipment are regulated by the pipeline network, while the boiler in the power plant adjusts the steam production volume to absorb such fluctuations.
Install a water cut bag to reduce fluctuations; the boiler level should not be too high
As the steam pressure increases, the boiling point of water also rises; try increasing the temperature of the steam.