What is the typical pressure after coming out of the molecular sieve, and then what is it for entering the booster-type turbine expander?
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What is the typical pressure after coming out of the molecular sieve? Also, what is the pressure at the inlet side of the booster-type turbine expander, and what is the pressure at the outlet side? And what is the pressure at the inlet side of the expansion side, and what is the pressure at the outlet side there? Thank you
Different devices have different situations, so it’s difficult to specify an exact parameter. For example, here we have 48,000 in terms of air separation capacity; the pressure at the molecular sieve outlet is around 0.49 Mpa. After three stages of compression in the compressor, the gas pressure reaches around 2.7 Mpa. This gas then enters the expansion machine’s compression section, where the exit pressure is around 3.87 Mpa. There is a slight decrease in pressure after heat exchange, but not significantly – it remains around 3.86 Mpa. The pressure at the exit of the expansion machine is around 0.45 Mpa. It depends on the specific situation; learn more about it.
Reply to 2# hxm2087: Does it first go through a booster to increase pressure, and then through a booster-type turbine expander? Does it enter at the booster end to have its pressure increased, and then enter at the expansion end for expansion?
Yes, heat exchange takes place at the high plate before entering the expansion section
Reply to 4# hxm2087: Why is heat exchange necessary?
Reply to 6# hxm2087: Is it to enter the main heat exchanger? Why is it necessary to recover cold energy? Please explain in more detail
The last edit to this post was made by hxm2087 on 2011-12-16 at 07:51. To achieve the separation of oxygen and nitrogen in air separation units, it is first necessary to liquefy the air, which requires lowering the air temperature to the liquefaction point. In air separation units, it is the expanded, low-temperature air that is used to cool the incoming air. For air to expand, it first needs to be compressed, and compression requires pressure enhancement equipment. Air separation expansion can be achieved through throttling expansion and expander expansion. However, the temperature resulting from these two types of expansion is ultimately limited, falling far short of the temperature required for air liquefaction; therefore, the main heat exchangers and condensation evaporators in air separation equipment play a crucial role in the production of liquid. The main exchanger uses the expanded, low-temperature, low-pressure air to cool the air flowing in the forward direction after the pressure-boosting stage, thereby gradually reducing the temperature of the air before the expander and also decreasing the temperature thereafter, until the temperature reaches that at which the air liquefies, thus enabling the liquefaction of the air flowing in the forward direction.
There are no specific figures for this issue, so it needs to be analyzed on a case-by-case basis. Different devices have different pressures. Internal compression, external compression, and self-pressurization devices are all different. The external compression is generally 0.45 MPa, while the self-pressurization is around 0.7 MPa.