Compressing a gas above compressor's discharge pressure

In summary, a 2 stage compressor with a final delivery pressure of 250 bar is being used to compress and store hydrogen in vessels. When the pressure in the storage vessel reaches the delivery pressure, the compressor continues running as the vessel has a safety pressure of 450 bar. This results in the pressure increasing above the discharge pressure of 250 bar due to a no return valve. The question is raised about the effects of this situation on the compressor's power consumption, both when the storage pressure is below and above the discharge pressure. It is expected that the compressor will use more energy to pump up to a higher pressure, with some energy being lost as heat of compression and the rest being lost through inefficiency in regulating back down to the working
  • #1
ttt
A 2 stage compressor has a final delivery/discharge pressure of 250 bar.
hydrogen is been compressed and stored in vessels.
The pressure in the storage vessel reaches the delivery pressure(i.e.250 bar) and the compressor is still running ( vessel has a safety pressure of 450 bar) and the pressure increases above the discharge pressure of 250 bar( with the help of a no return valve).
I want to know what effects this situation will have on the compressor's power consumption?(when the storage pressure is below and above discharge pressure)
Would there be any energy losses?
 
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  • #2
The compressive uses more energy to pump up to a higher pressure, obviously. Some is lost as heat of compression and most of the rest is lost as inefficiency in regulating it back down to working pressure.
 

1. How does compressing a gas above a compressor's discharge pressure work?

When a gas is compressed above a compressor's discharge pressure, it is typically done through a series of stages. The first stage compresses the gas to a lower pressure, and then the gas is passed to a second stage where it is further compressed to the desired pressure. This process is repeated until the gas reaches the desired pressure above the compressor's discharge pressure.

2. What is the purpose of compressing a gas above a compressor's discharge pressure?

Compressing a gas above a compressor's discharge pressure is done for a variety of reasons. One common reason is to increase the density of the gas, making it easier to transport and store. It can also be used to increase the energy content of the gas, making it more efficient for use in various applications.

3. Can any type of gas be compressed above a compressor's discharge pressure?

Yes, most gases can be compressed above a compressor's discharge pressure. However, the type of gas and its properties will determine the specific methods and equipment needed for the compression process.

4. Are there any safety concerns when compressing a gas above a compressor's discharge pressure?

Yes, there can be safety concerns when compressing a gas above a compressor's discharge pressure. It is important to follow proper safety protocols and use appropriate equipment to prevent accidents or leaks. Additionally, compressed gases can be hazardous if not handled properly.

5. Are there any limitations to how much a gas can be compressed above a compressor's discharge pressure?

There are limitations to how much a gas can be compressed above a compressor's discharge pressure. The maximum pressure that a gas can be compressed to will depend on factors such as the type of gas, the temperature, and the equipment being used. Exceeding the maximum pressure can result in damage to the equipment or even a dangerous explosion.

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