What are high-temperature expanders and low-temperature expanders in ACD?
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A domestic plant with 60,000 units of high-temperature and low-temperature expanders equipped with ACD; there are also domestically produced low-temperature expanders. But what exactly do these high-temperature and low-temperature expanders refer to here?
Simply put, to distinguish between high-temperature and low-temperature types, one looks at the inlet temperature of the expander; those with higher temperatures are referred to as high-temperature expanders or the hot side, while those with lower temperatures are known as low-temperature expanders or the cold side.
The relative value of the inlet temperature or the outlet temperature determines whether it is a high-temperature unit or a low-temperature unit; both types provide cooling capacity to the device~~
Why is it configured this way? Can’t a expander do it?
Isn’t the process of a conventional expander to draw medium-pressure air at 2.2 MPa from the compressor, pass it through the high-pressure plate, and then proceed from the compression side to the expansion side? How are high temperature and low temperature expressed?
The process organization varies depending on the purpose of the unit; this arrangement is commonly used in liquid air separation or liquefaction units
Taking the nitrogen cycle liquid air separation as an example, the inlet pressure of the high-temperature expander is ~2.5 MPa, the outlet pressure is ~0.45 MPa, the inlet temperature is -25 degrees Celsius, and the outlet temperature is -105 degrees Celsius. The inlet pressure of the cryogenic expander is ~5.2 MPa, the outlet pressure is ~0.45 MPa; the inlet temperature is -110 degrees Celsius, and the outlet temperature is -175 degrees Celsius. Air circulation or liquefaction equipment is similar as well~~
In what kind of process are two expanders for high temperature and low temperature installed?
Liquid air separation and liquefaction units (dual turbine expanders) have this configuration~~