Is the furnace maintained at a constant temperature of 120 degrees and 204 degrees to remove mechanical water and crystalline water respectively? How is temperature obtained?
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Is the furnace maintained at a constant temperature of 120 degrees and 204 degrees to remove mechanical water and crystalline water respectively? How is temperature obtained? This post was last edited by *aoye613 on 2009-3-9 18:55]
Generally speaking, the mechanical water should be removed at temperatures between 120-150 degrees, while the crystalline water should be removed at temperatures between 300-350 degrees. Check whether your oven drying setup maintains a constant temperature within these ranges 204 degrees may be intended to ensure even heating. (Just a guess, haha) ； This year we heated the furnace three times to remove water, with the constant temperature points being 150 and 350 degrees respectively.
I suggest you check the type of furnace bricks used in your furnace, as well as the type and properties of its insulation material; the control of this temperature is likely related to the furnace bricks and their insulation material.
Oven drying is generally carried out at atmospheric pressure or slightly negative pressure. At atmospheric pressure, the boiling point of water is 100 degrees; however, taking into account the thickness of the insulation material and heat transfer, a temperature of around 20 degrees can be considered. The exact value depends on the thickness of the insulation. The separation of crystalline water is related to the insulation material, and for substances such as silico-hydrates, their decomposition temperatures can be referred to. In oven drying, it is important that the temperature rise be gradual; the specific time spent at a constant temperature is not that critical.