Catalytic baking lining
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According to the operating procedures, \"the settler, lift pipe, and external heat exchanger are heated at a rate of 3°C per hour; after 27 hours, the temperature is maintained at 110°C for 44 hours. Afterwards, heating continues at a rate of 5°C per hour, until the temperature reaches 150°C after another 8 hours, after which it is maintained at that level for 48 hours.\" Is it really necessary to use such a slow heating rate of 3°C or 5°C per hour? Why? Thank you!
For a plant being put into operation for the first time, the rate at which the lining is heated needs to be carefully controlled; generally, a slower rate is preferable. A sufficient amount of time at a constant temperature is required to ensure the proper drying of the lining. But your heating rate is really slow. It’s relatively difficult to control. For the lining drying curve at the start of construction, please consult the lining company. Personally, I think it is sufficient as long as the requirements of the lining company are met; for example, we use 15°C/h. The slower, the better!
The removal of water from the surface of the lining should be done slowly, to prevent the lining from cracking due to excessive heating as a result of rapid removal of the surface water.
Indeed, the slower, the better, to allow the moisture to evaporate gradually. If you want the water to gush out just like when boiling water, the lining will come off. But this speed of yours is a bit too slowly designed. The speed recommended for the 2nd floor is sufficient; also, note that the temperature increase should be done linearly, rather than increasing by 15° at a time.
Which company does the poster work for? I’ve never heard of something being this slow; it seems there’s a serious problem with these operating procedures you’ve provided After you start the backup unit, compressed air has to do work, which generates heat; as a result, the temperature of the air rises above 110 degrees. The main air pressure for heat extraction at Shanghai International Studies University still needs to be increased by nearly 20 degrees. Let’s pay attention and see what the experts have to say~
It seems like your operating procedures are incorrect; it’s very difficult to control such a low heating rate
Refer to the furnace heating curve provided by the lining manufacturer; generally, the temperature increase rate is between 10 and 20°C/h. It is important to maintain a constant temperature at 150°C and 350°C in order to remove any free water and crystalline water from the lining.