Methanol compressor addition and subtraction issues
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Our methanol compressor is divided into a compression section and a circulation section. The compression section is divided into two stages of compression, with one circuit and one valve, and two circuits and one and two valves. When both valves are not completely closed: The outlet temperature of the first stage of compression is 102, and the outlet temperature of the second stage is 85 (alarm indicator 105). At this time, is it better to close one valve once or once every two times when adding volume? Even without adding volume, how to adjust the one-stage, one-stage, and two-stage valves so that the outlet temperature of one section does not approach the alarm indicator?
If I go to operate it, I will choose to close the valve opening once, then open the valve opening twice, lower one section first, and then open it up once, then reduce the valve opening two times to control the temperature stably. I don’t know if I am right? I hope others can give me some pointers as well.
I wonder if you have a reflux cooler? The poster did not explain in detail that the following measures should be taken: 1. Lower the intake air temperature of one stage. 2. Reduce the compression ratio of one stage.
I don’t know if there is a water cooler in the anti-surge circuit. If not, it is best to add one to prevent excessive temperature rise in the case of a large reduction in power. In addition, the temperature rise of one cycle is relatively high, so first adjust one to one, then adjust two to one, observe the alternating temperature changes, and adjust the temperature to almost the same level. In addition, the temperature of the inlet water cooling should be lowered as much as possible to reduce the compressor suction temperature. This post was last edited by FEIJING on 2009-2-18 12:37 ]
I personally feel that if you are afraid of a temperature alarm, you should turn off the two-stage one, because the temperature of the two-stage one is high, which will cause the inlet gas temperature to increase, which will directly increase the outlet temperature. But the one-stage temperature can be lower than the one. Is it useful to turn off the high-temperature one? Our compressor has two anti-surges, one compression section and one circulation section. It may be different from yours. I don’t know if what I said is correct. I hope you can give me your opinions.
It should be turned off once and back to one first, and then off twice and back to one. This is also done in actual operation. Be slow when adjusting!
The specific situation and specific treatment are actually similar. personal control * habit problem.
Off one cycle is the main one, and the adjustment on two cycles is more volatile.
I think the first and second speeds can be adjusted according to your compression ratio. If the compression ratio is suitable, then use one-time adjustment.
Turn off the first cycle first and then use the second cycle to adjust the air volume and temperature.
You should first turn off the small one and one control, and enable the second and second control. You might as well give it a try.
I don’t know if your circuit has a cooler. If so, I can adjust it however I want.
I think if the temperature of the outlet of one section is high, it should be that the compression ratio of the first section has exceeded. At this time, the pressure of the first outlet should be reduced, that is, turn it down two to one. If the amount is increased, the effect of turning off the second and second loops is not obvious. You should turn down the first and second loops, and adjust the compression ratio of each section within the index range to avoid overheating. I don’t know if that’s right or not, please discuss.
1. Reduce the amount； First subtract one back to one, then subtract two back to one. 2. Add amount ； First add two to one, then add one to one.
The amount of addition and subtraction is controlled using two loops to ensure that the compression ratio at all levels is within the design range. One time and one time are only used during startup and shutdown.
How to do it depends on the actual situation of your compressor. Use different methods such as adjusting once and once, once and twice, etc., and then summarize.
Even if no amount is added, an inter-section cooler should be used to control the primary and secondary outlet temperatures.