Compressor pressure recursive control, as well as low selection and high selection

I need you to send over your control logic diagram before I can analyze it for you.

This post was last edited by zhangchao2012 on 2017-2-10 at 17:32. Talking about the recursive control of compressors can be a bit complicated, but the actual operation is quite simple. I’ll mention several common control methods: 1. Inlet pressure control – When the three return valves are set to automatic mode, the inlet is also placed in automatic control; in other words, the inlet pressure is maintained at a certain level, for example, 2.1 MPa. In cases where there are fluctuations in the hydrogen system, the inlet pressure is adjusted by changing the positions of the return valves between different stages. This approach can result in significant fluctuations in system pressure, so it is not recommended. 2. Outlet pressure control – The control mechanism is similar to the above; it aims to maintain system pressure. However, the inlet pressure remains unstable with large fluctuations, so this method is not advisable. 3. Manual control for each stage – This is a common control method that provides stability, and it is recommended. 4. Using variable air volume control – This is a simple method to adjust the flow rate, and it is recommended as well. 5. The control method that involves selecting between high and low settings is not recommended, as it can be difficult to understand. Although the operation itself isn’t complicated, it’s important to ensure that the outlet pressures, temperatures, and differential pressures at each stage do not reach the interlock values during operation

It can be considered a control scheme that represents a certain level of progress, but more energy-efficient new technologies should be developed

After extensive research, trying low-selective control once or twice didn’t work; the instrumentation field was unable to implement it. For 10 years, manual control has been used, as it ensures stability in the hydrogen level in the system – a simple and reliable method. Currently, efforts are being made to develop automatic low-selective control through technical innovation…

It’s complex; Holbiger’s infinitely adjustable shading system is good.

If stepless adjustment isn’t available, in later stages it’s usually necessary to use a manual control valve to regulate the compression ratio, or to control the inter-stage cooling temperature – after all, this is also very important for new hydrogen generators; manual setting of a fixed value provides greater stability than automatic adjustment~~~

First, the return valves at each stage of the new hydrogen machine are manually controlled to ensure stable pressures at each stage as well as in the reaction system. 2. Then, based on the valve position maps at various levels, the output of the regulator is calculated from the valve position outputs. 3. Due to this control scheme, each control valve is operated by two regulators; the principle for selecting which regulator will control the valve is to choose the one that results in a larger opening degree of the return valve. Afterwards, the outputs of all regulators are adjusted to the selected calculated values. 4. Finally, from level 1 to level 3 in sequence, set the regulator to automatic mode!