Oxygen compressor reverse operation issue
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For our newly installed equipment, the oxygen production capacity is 3200, and the oxygen compressor also has a capacity of 3200. So, how should we proceed when switching machines? Should we start the backup machine first and then shut down the current one, or should we shut down the current machine first before starting the backup one? If it is stopped first and then started again, it will have an impact on the subsequent chemical processing stages. But if it is started first, will the oxygen output be around 6,000 to 7,000? Will that disrupt the operating conditions of the distillation tower? I’m not sure how to proceed at the moment; please help me out
1. Is yours a turbine type or a reciprocating type? Reciprocating types are easier to handle, while turbine types are more difficult. . 2. First, start the machine and let it run idly; open all the inlet valves and the return valve fully. Then, slowly close the return valve to build pressure, and open the outlet valve to supply oxygen. After that, slowly open the return valve of the previous compressor, as well as the outlet valve of the backup compressor. . . The process is slow. . Then, close the outlet valve and inlet valve of the compressor before shutting it down. . . Just shut it down. .
It’s better to start the backup unit first; check its operating status under normal pressure. Once there are no issues, then reduce the pressure on the unit that is in use. If done properly, one unit can have its pressure reduced while the other has it increased – slowing down the increase in pressure will not affect the output volume. The output volume can be controlled using the release valve, and once the backup unit starts producing output, the other unit should be stopped. Because the subsequent stages of the ball tank process will not be affected.
If there are no ball tanks and the oxygen compressor lacks a return valve, how can flow be reversed when there is only a small return line from the outlet main pipe to the inlet main pipe?
When operating an oxygen-injection press, it is necessary to have a considerable level of control over pressure and flow.
Reply to 2#: It’s me, Jiu Tian. Ours is a reciprocating type. Before starting that backup unit, should the vent valve of the oxygen compressor be fully open or fully closed?
Reply to 6# syl38133: Before starting the oxygen compressor, nitrogen should be used for purging first to prevent air from entering. . . Then air defense can be activated, but once the replacement is complete, air defense must be turned off and full reflux should be enabled. . . However, slightly open the inlet valve to control the gas flow rate; yet during the overall reversing process, it is necessary to keep in touch with the air separation team to determine the amount of gas being removed, so as to make timely adjustments. . .
Generally, the drain valve of a compressor is fully open before startup, which is a requirement for starting it. We are exactly the opposite of the nine-day approach: after closing the return valve, we use the vent valve to increase the pressure until it matches that of the pipeline network, after which we open the discharge valve. This allows for complete displacement of nitrogen, preventing the pressure in the unit from rising too quickly and causing overpressure. Moreover, since all the nitrogen has been discharged, no further adjustments are needed.
Does each oxygen compressor come equipped with a return valve? Is it three times and then one return, or one time and then one? Looking forward to exchanging ideas
The old reciprocating oxygen compressors came in 1-stage and 4-stage versions; they have now been replaced with nitrogen compressors. In the new design, we use a turbine + piston-type sequential pressurization system. The turbine has return flows from both the high-pressure cylinder and the low-pressure cylinder, while the piston type involves only one stage of compression with just one return valve that connects the outlet to the inlet. Behind this return valve is a check valve, and it is behind that check valve that the discharge valve is located; the vent valve is connected in front of the check valve.