Full
Outline
The treatment process of uranium purification and conversion waste liquid involves a continuous circulation system composed of neutralization, extraction, stripping and other units. Its stability is highly dependent on the precise control of small flow in each link, and it is easy to cause system overshoot and oscillation when the parameters of PID controller are adjusted by trial and error method based on experience, which leads to system disorder. In view of the above problems, it is proposed to establish a mathematical model with the key equipment ' lean organic phase pump ' as the control object. Five kinds of PID parameter tuning methods, such as classical Ziegler-Nichols (Z-N) method, improved Z-N method with set point weighting, optimal setting method based on ISTE criterion, critical proportional zone method and relay feedback self-tuning method, are compared and studied. The simulation analysis is carried out by MATLAB and Simulink, and the optimal method is applied to the field for experimental verification. The test results show that compared with the traditional Z-N method, the PI controller based on the optimal setting method based on the ISTE criterion performs best. When the field flow step changes, its key performance indicators are better than other methods, which can fully meet the strict requirements of the process flow. For the small flow control system in the treatment of uranium purification and conversion waste liquid, this method is used to adjust the PI parameters, which can effectively suppress overshoot, speed up response and ensure accuracy, and significantly improve the stability and reliability of the whole process. This study can provide a reference for the controller optimization of similar industrial processes.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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