Principles of cooling and capacity reduction for petrochemical plants
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Volume increase principle: Increase temperature first, then increase volume； Decrease principle: Lower the temperature first, then reduce the volume. I know that. I just want to know if it’s synchronized? For example, the principle of gradual reduction: if I want to lower the temperature from 100℃ to 80℃ and the quantity from 150t to 120t, I first reduce the temperature to 80℃ and then gradually lower the quantity to 120t. Or should I lower the temperature by 10°C and correspondingly reduce the amount, until I reach the desired temperature and quantity?
Is it really necessary to be so strict?
This needs to be controlled based on actual conditions, following the principle of first reducing the temperature and then reducing the amount. This approach is intended to prevent large fluctuations in temperature. For example, if the temperature is reduced to 90°C and then the amount is decreased to 120t, the extent of this reduction in amount exceeds the decrease in temperature, which can cause the temperature to rise again, possibly to 105°C. Therefore, it’s necessary to control these factors oneself
This should be synchronized; there’s no need for a sequence – maintain steady operation and refer to auxiliary parameters as much as possible