How to increase the inlet flow rate of a compressor
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(In units of coal-to-methanol production,) whenever the hydrogen content is high, the inlet flow rate of the centrifugal compressor decreases significantly. Increasing the speed of the condensing steam turbine results in even higher hydrogen extraction rates, and the anti-surge point moves closer as well. How do top experts usually solve it? How to increase the inlet flow rate when the hydrogen content is high? Is it the only way to increase the inlet flow by adding a circuit?
1. It can reduce the pressure in the synthesis system, thereby lowering the pressure at the compressor outlet and decreasing the compression ratio； 2. Increase the compressor speed. I don’t understand why you say that the hydrogen level will keep rising as it is pumped out
This is a comprehensive issue that requires first examining the gas composition. Additionally, check the H/C value of the fresh gas to see if it deviates significantly from the design value.
Is the flow meter a volume or mass flow meter?
Reducing the pressure in the synthesis system is quite effective; the pressure ratio also decreases. The anti-stall point is also much further away.
Generally, at such times the gas composition consists of more hydrogen and less carbon, with a hydrogen-to-carbon ratio that differs from the normal value. The main issue is that water gas cannot be supplied. . .
This approach is wrong; when the hydrogen level is high, one should promptly adjust the gas composition. What’s the point of increasing the compressor speed?
When the hydrogen level was high, the composition was also adjusted. The last issue encountered was a fault in the gas generator – water gas could not be supplied properly, and the compressor’s anti-surge point was approaching, so the rotation speed was increased to pump air out and keep that point at a safer distance.
The main consideration is the change in the gas composition; the compressor’s design capacity is based on the gas composition under normal operating conditions. Any change in gas density will certainly affect the air intake volume, so it is necessary to conduct comparisons during operation