How to reduce 4.0Mpa natural gas to 0.4Mpa
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How to reduce 4.0Mpa natural gas to 0.4Mpa. Now we need to design a method to reduce 4.0Mpa natural gas to 0.4Mpa, with a flow rate of 40000NM3/hr. The gas source is mainly used as fuel for industrial furnaces. What kind of equipment should be used? Can a simple control valve or pressure reducing valve work?
One definitely won’t work, at least you need PSV.
One definitely won’t work; you also need to design a pressure reducing buffer
If it is sent to combustion, it is best to have a buffer tank, and it is best to reduce the pressure in several stages. When the final stage requires precise control, a valve should be used, either a self-operated or a regulating valve. The pressure difference is so big, is there any way to do the work first and recover the energy?
There seems to be a special decompression pry for sale. You can check it online. I used to have a friend who made this pry, but now he doesn’t seem to do it anymore.
It is more feasible to use graded decompression. One-stage decompression is too dangerous and unreliable.
If the pressure difference of the first-level decompression is too large, it is better to decompress in stages, and a buffer tank can be installed in the middle.
When the pressure is adjusted from 4.0MPa to 0.4MPa, the pressure ratio drop is too low. Generally, the regulating valve can be adjusted up to 2-3 times at a time. The above situation requires three regulating valves. Moreover, as a fuel gas supply, in order to ensure the stability of the fuel gas, a fuel gas buffer tank should be set up. If the pressure drop is reduced so much, the temperature will be reduced by at least 20 degrees. The insulation issue needs to be considered.
I once did a project to reduce CNG 2.0MPA to 0.4MPA, using two stages of pressure reduction. If the pressure is reduced from 4.0MPA, three stages may be required. You need to calculate it. If the transmission pipeline is long, you don’t need a buffer tank. I would like to ask, where does the 4.0MPA natural gas come from? Is it the gas transported from the West to the East?
Using graded pressure reduction, it is best to calculate the volume of the intermediate buffer tank based on the buffer time of 5 minutes.； Level 1 decompression is too dangerous and unreliable
What you said above is very correct. Gradual decompression is fine. The key is to analyze this issue in the actual use process. Otherwise, it is just a one-point question, and the answer may not be the best.
You can use orifice plates, porous multi-stage pressure reduction.
A self-energized pressure reducing valve is sufficient, and a safety valve needs to be installed behind the valve. The pressure drop is very large, which is a critical flow. Consult the pressure reducing valve supplier whether it is necessary to install a flow limiting orifice plate, otherwise the pressure reducing valve will be easily damaged.
Need a pressure reducing valve and add a buffer! Alternatively, use graded decompression.
4MPa——>0.4MPa single-stage decompression is definitely not possible. Multiple levels are recommended.
Graded decompression is more feasible! Can energy utilization be considered?
With such high pressure and flow, you can consider adding an expander to generate electricity to recover energy and cooling capacity. A technical and economic analysis needs to be done to see if it is cost-effective. For direct pressure reduction, it is recommended to use the 4th floor method, which is safe and reliable. However, a safety valve must also be installed in the buffer tank or downstream of it.
This can be done using a two-stage voltage regulator.
:) This person has thought very carefully and must have practical experience. It is understood that the gas is transferred from the West to the East: handshake
Oh my God, there is such a good thing, it supplies such high-pressure natural gas, allowing you to use it at reduced pressure. If I ever find myself in this situation, at least let the gas power our running equipment and then get the gas to where it is used