Starting up a centrifugal air compressor
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How to enrich the gas in a centrifugal compressor driven by a turbine? Before starting the compressor in a catalytic cracking unit, the pressure in the compressor inlet is controlled using a flare system; at this point the compressor operates at low speed, while the turbine speeds up until all of the compressed gas has been fed into the downstream system. What is the process for adjusting the inlet flare valve and the compressor during this time?
In fact, these operations should all be described in detail in your operating procedures, as that would better suit your actual working conditions. If not, you can search for relevant information on the forum for reference!
Operations in this regard must be carried out in accordance with the operating procedures, without any ambiguity. Before starting work, it’s essential to understand the principles involved as well. Let’s create a flowchart first; it’s best to explain things by looking at the diagram.
An increase in the compressor speed leads to a decrease in pressure; at such times, the flare valve must be closed to maintain stable pressure. When increasing the speed and integrating it into the stabilization system, care must be taken to prevent surge in the unit. Once the flare valve is fully closed, speed should be used to control the pressure!
Initially, the rich gas was not fed into the absorption and stabilization system; why did the reaction pressure decrease as the speed increased?