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What are the requirements for the installation of the DEAR air separation plant instrumentation test lines?

What are the requirements for the installation of the DEAR air separation plant instrumentation test lines?
Aug 13, 2021
Author: DEAR AST

DEAR Air separation plant.The liquid oxygen circulating adsorber is used to absorb the impurities in the liquid oxygen and switch regularly; if the acetylene or hydrocarbon content in the liquid oxygen exceeds the standard, the alarm will start. In addition to the requirement of discharging liquid oxygen equivalent to 1% of the gas oxygen output per hour, the liquid discharge shall be increased; the plate type main cooler shall adopt full immersion operation; the main cooler shall have good grounding device.In the actual expansion process, due to the loss of mechanical friction and eddy current, the external work is reduced. It also transfers the heat energy to the gas, so that the actual enthalpy drop is reduced, the unit cooling capacity is reduced, and the temperature drop is also reduced. The expander efficiency η P is the degree that the actual expansion process is close to the ideal expansion process, that is, the ratio of unit actual refrigerating capacity △ h and unit theoretical refrigerating capacity △ HT.
The length of plate unit is about 5.4m, while the length of switching heat exchanger is 6m. Due to the simple equipment and low cooling loss in the device, the intermediate temperature of the heat exchanger can be generally higher or similar to the circulating temperature of the long plate heat exchanger.DEAR Air separation plant.Moreover, the cooling capacity of throttling effect accounts for a large proportion of the total cooling capacity. For example, when the working pressure is 3.0MPa, the refrigeration capacity of throttling effect per cubic meter of process air is 8.4kj/m3, and the refrigeration capacity of expander per cubic meter of expanded air is 37.7kj/m3.DEAR Air separation plant.When the heat flow is out of date, the heat (cold) storage body releases cold capacity (or heat storage), the temperature increases, and the temperature of the heat flow body decreases due to heat release. The cold fluid and the hot fluid do not contact each other, but indirectly transfer the cold quantity from the cold fluid to the hot fluid through the heat storage body as the medium.
DEAR Air separation plant.In the switching heat exchanger, the positive and backward gas flow through different channels at the same time to exchange heat directly. Therefore, under normal conditions, it is basically a stable heat transfer process, that is, the temperature of each section of the heat exchanger (the temperature of positive flow and backflow gas, as well as the temperature of baffles and fins) does not change with time.In addition to reducing air loss and equipment resistance as much as possible to increase air volume, and reducing cooling loss, incomplete heat exchange loss and leakage as much as possible to reduce expansion air volume, this paper mainly analyzes the method of adjusting the output from the perspective of adjusting distillation conditions.DEAR Air separation plant.The air temperature measured during the hot blowing period is not a straight line. During the cold blowing period, the temperature of waste nitrogen decreases continuously. This is because the waste nitrogen passes through the packing layer and transfers the cold energy to the packing, so that the packing temperature decreases continuously.

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