Cooling capacity issues of expansion compressors
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The air separation unit is equipped with a compression expansion machine. During previous testing, the engineers said that to increase the amount of cooling capacity, one needs to raise the speed of rotation. However, I believe that increasing the cooling capacity can be achieved by opening the nozzles; raising the rotation speed merely transfers the existing cooling capacity from the oil brakes to the compressed gas, without actually increasing the cooling capacity! Who can help me understand the relationship between expansion cooling capacity, compressed air, and oil brakes? Thank you so much!
I’ve never heard of oil brakes. Increasing the nozzle size is meant to raise the rotational speed. There are two ways to increase the rotational speed: one is to reduce the backflow in order to increase the pressure ahead of the machine. II. Increase the speed by enlarging the nozzle. The first method aims to improve the efficiency of the expander, while the second method increases the expansion volume, thereby increasing the amount of cooling as well.
Mainly, sometimes the nozzle is opened wide, but the rotation speed doesn’t increase; only the hydraulic braking force goes up! So ‘I can’t figure out the relationship between them... thanks!’
What is oil brake? ? Haven’t heard of them either?
Oil brakes? Have you never heard of them? How is the speed controlled when a compression expander is first started?
Is it convenient to upload the expander data or PID? Let’s all take a look at how to solve it!
This is indeed a bit inconvenient! I’m sorry! The company has rules against disclosing information such as PIDs!
We are gas expanders. To start an expander, it is sufficient to slightly open the guide vanes once the flow path is established, and the speed is controlled through these guide vanes. Adjust the speed in conjunction with the reflux.
Oh! More or less! We are also gas expanders… but oil brakes are still needed to control the speed when starting up
Are your expander and booster separate? If they are separate, there is a braking device available, such as hydraulic braking, mechanical braking, air braking, etc. In an integrated system, the energy from the expansion stage is transferred to the compression stage, where the compressor consumes that expansion energy.
We are also coaxial, but for safety reasons, we have added an oil brake as well! American ACD’s!