The proportion of cooling loss and incomplete heat exchange loss in the total cooling loss of air separation equipment is influenced by various factors, including device capacity, design temperature difference, etc. Generally speaking, with the advancement of equipment technology and the improvement of insulation performance, the proportion of runaway cooling loss in the total cooling loss shows a downward trend; Incomplete heat exchange loss is difficult to completely avoid due to temperature differences and accounts for an important proportion of total cooling loss.
Cold running loss refers to the amount of cold consumed to maintain internal temperature stability in an air separation equipment, even though it is filled with insulation material, due to the external environment temperature being higher than the internal temperature, causing heat to enter the interior. Influencing factor: The unit cooling loss decreases with the increase of device capacity. This is because large equipment has better insulation performance and larger heat capacity, which can better resist the influence of external environment.
Incomplete heat exchange loss refers to the loss of cooling capacity that cannot be fully recovered due to the existence of temperature differences during the process of transferring heat from high-temperature substances to low-temperature substances in a heat exchanger. Influencing factors: The incomplete loss of heat exchange is directly proportional to the magnitude of the temperature difference at the hot end. The temperature difference at the hot end of large-scale air separation equipment design is generally around 3 ℃, and the incomplete loss of unit heat exchange in different devices does not vary significantly.
Therefore, effective measures need to be taken in the design and operation of air separation equipment to reduce these two types of cooling losses, in order to improve the energy efficiency and economic benefits of the equipment.
