Compressor speed regulator

No problem at all; our 105-J and 103-J models use electro-hydraulic conversion for speed control. However, it enables seamless adjustment of the unit’s speed from 0 to 100%. Automatic acceleration and deceleration of the unit can be achieved. However, since the two turbines 103-J are related to the balance issues of the high and medium pressure steam networks, automatic speed control is generally not used.

That means there is no minimum control speed

Control can start from 0 RPM, enabling seamless adjustment of the speed. It can be controlled at every speed.

Any governor has a speed control range; it is not possible to start controlling from 0 RPM. There is also an absolute minimum control speed, that is, the lowest continuous speed. Here, there are both the control range of the governor and the process requirements; more importantly, the operating range must avoid the critical speed of the unit.

Our syngas compressor is of the centrifugal type; its speed regulator is controlled by oil pressure, and the operating speed set by the regulator is 9200 revolutions per minute. It can be controlled either by the main control system or by a local synchronizer, with the main control system being used in most cases.

I don’t know why this person is so confident When you say there is definitely a minimum control speed, that is, a minimum continuous speed, does your facility also use the speed control mode of the four main units in the original large-scale nitrogen fertilizer production plants? Let me explain a detail for your judgment: After modifying the speed controller of our 105-J ammonia chiller, it can automatically increase its speed from zero RPM along a predetermined acceleration curve until it reaches the normal operating speed. Once the desired speed is set according to the process requirements, the chiller will automatically reach that speed. It is also possible to manually start the unit from the control room, allowing it to be accelerated to various speeds such as 500 revolutions, 800, 1000, 1500, 2000, .............. 7000, and so on. A too low rotation speed is unnecessary due to issues with the speed sensing probe as well as the actual requirements of the unit. The unit can speed up as well as slow down; it’s a program that I personally tuned and improved. Of course, whether automatically or manually, we will not allow the unit to remain in the critical speed range to prevent damage to it.

This post was last edited by *ayanfeng on 2009-5-11 09:54. It deals with the control simulation of ammonia synthesis, in which compressors are simulated; they utilize a relatively advanced 3C control system for the compressors, without any minimum speed control, offering stepless control from 0–100%. Among them, the synthesizer compressor uses 3+ electronic speed control, while the high-pressure turbine

Yes, generally, the starting of large compressors involves one or two stages of priming, followed by adjustment to a speed above the critical speed. I have just started studying compressor control systems as well; I hope to seek your advice more in the future

This post was last edited by 2ndliver on 2009-5-11 10:10. According to the speed control mode of the four major imported units? What’s relatively advanced these days is the use of digital electro-hydraulic speed control systems, namely DEH. No matter how sophisticated the programming may be, if the hardware is from Hangqi, it’s still somewhat better. After starting up the feed oil and emergency shutdown oil on-site, everything else is controlled from indoors through steam inlet control valves. During the startup phase, true control isn’t possible. Our unit’s control system is ITCC. If you consider startup to fall within the scope of control, and if you don’t have an idea of what the minimum continuous speed should be, just imagine: for a 105-JT unit, which is typically of the condensing extraction type, there are high-high and low-low interlocks for the extraction steam. It’s not as simple as just setting a certain speed to enable continuous operation; the extracted steam serves as the source for the medium and low pressure steam networks in the ammonia synthesis process. If the speed falls below the minimum continuous speed, it’s still under control, though the result of such control is an automatic shutdown. Try seeing how your differential control system handles this situation. However, it is recommended not to try it. As for something like 103-JT, it’s driven using a quick-shut valve. Maybe I’m not well-informed, but with such hardware, I’d like to see how control is achieved starting from 0 RPM, and automatically at that We also welcome those from other large nitrogen fertilizer plants that have introduced control systems for their four main units to share their experiences

Electronic speed controllers have a minimum control speed; the synthesis gas compressors in large ammonia production plants can use such electronic speed controllers. The synthesis gas turbine mentioned by the original poster is not of the type that uses extracted steam for condensation. Under normal circumstances, the unit’s load is controlled so that the speed remains within the range from the minimum value to 105% of that minimum value, while still meeting the requirements of the manufacturing process.