“What will be the effect of such optimization?
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This post was last edited by wt2008 on 2015-8-11 07:53. Recently, a group of people arrived; they are said to be from a company affiliated with a university in China, and they have come to the company to assist with optimization work. I asked, and it’s about optimizing the control system – a comprehensive optimization of all workshops and all control circuits. What is meant by control system optimization is nothing but the optimization of PID parameters. It is said that after the optimization, control became stable, with very significant results. Now, several major companies are implementing assessments based on stability rates; therefore, the managers assume that after optimization, the stability rate will increase. As a result, hundreds of control loops in each device are being optimized, even those that have always been operated manually are being optimized. They have already visited more than a dozen factories, and it is said that they are too busy to handle everything. I asked if you can optimize it when the reaction temperature varies greatly They say it can’t be optimized, as they don’t know the influencing factors. I mentioned that there are periodic fluctuations in the back-pressure at one factory – have you optimized it? They don’t either. I say it’s really easy to make money in China – no problems at all. It allows you to carry out lots of optimizations, but the real problems can’t be solved through those optimizations. China’s science and technology have been tarnished by you. Please discuss what the effects of optimization will be I would especially like to ask those friends from factories that have carried out optimizations to share how the results were
This post was last edited by liaifeng on 2015-8-11 08:19. Are you referring to APC (Advanced Process Control)? To be honest, under stable conditions, this system is indeed good – it offers relatively high yields and efficiency – but it requires manual setting of the upper and lower limits! However, units that start up or frequently change oil types are not recommended for use. We implemented this APC here precisely because of the large fluctuations in oil types!
This post was last edited by wt2008 on 2015-8-11 08:44. It might be the one you’re referring to; I’m not quite sure. However, these so-called advanced controls ended up falling through. The simplest is the most practical. Only the simplest and most practical solutions can stand the test of time and remain viable.
This post was last edited by liaifeng on 2015-8-11 08:47. People try to imitate, but they don’t succeed; DCS is implemented, but the equipment can’t keep up; APC is implemented as well, yet the equipment still can’t keep up! Leaving behind a sense of regret! However, things should be viewed from two perspectives: taking into account their advantages as well as their shortcomings! Many things are introduced, but it also depends on the actual circumstances; it’s not possible to make generalizations, at least they need to be in line with the characteristics of the device.
Advanced control technologies are good, but at present there are still some issues that need to be addressed, such as changes in the type of oil used as raw material and the identification of instrument failures. Additionally, the impact of these technologies on yield and energy consumption after they are put into use also needs to be taken into account; there is still a long way to go
Could someone who has used it share their experience? It would be best to have a detailed list of the advantages and disadvantages.
At present, many advanced control systems for control loops in our equipment have not been put into use, and they are unstable once activated
The APC system is indeed useful for devices that need to operate smoothly, saving time and effort. However, when faced with unstable properties of the crude oil or frequent changes in processing volume, adjusting the APC becomes another labor-intensive task. APC is very helpful in ensuring the smooth operation of large-scale installations and improving their stability, but the case is different for small-scale installations. Furthermore, the so-called simple adjustment of PID parameters only affects the tracking time and fluctuation amplitude of the control valve controller. Properly set PID parameters can indeed ensure stable operation, but the specific adjustments need to be made based on one’s own equipment; there is no one-size-fits-all approach. Moreover, the cost of installing an APC control system is not low either; after all, producing high-quality products through safe production is the ultimate goal. If it cannot generate profits for the company, then no amount of optimization will help!