PLC control in supercritical CO2 fluid extraction applications
3-0075-04 centrifugal pump mechanical seal selection of Zhang Wei,uggs kopen, Pan Libin, Zhang Xudong (Sulzer Dalian Pumps & Compressors Ltd., Dalian 116600, China) Abstract: This lists the basic structure of the mechanical seal,Scarpe Hogan, an analysis of its characteristics and use of made the choice to use centrifugal pump mechanical seal should consider several key aspects and considerations. Keywords: centrifugal pump; mechanical seal; structure; use CLC: TE964.03; TH136 Text Search: BMechanicalSealSelectionforCentrifugalPumpZHANGWei, PANLi-bin, ZHANGXu-dong (SulzerPumps & CornpressorsLtd.,ugg australia italia, Dalian116600, China) Abstract: Thebasicstructures,uggs australia, characteristicsandapplicationrangesaboutmechanicalsealswereintroduced, severalpiecesofadviceandattentiveissuesforthemechanicalsealselectionweresetforth . ·+critical fluid CO, and to drive the compressor, in the extraction vessel and the separation between the loop reactor from the top left of the extraction kettle extraction of dissolved substances in high-pressure gas by cutting the throttle into the buck to solute precipitation separation vessel, separating solute from the bottom of the reactor discharge. supercritical fluid is entering the compressor, the compressor recycle into the extraction vessel through the inverter to control the PID parameters, the use of PLC machine data changes in real-time monitoring, dynamic display and report output etc., and finally to print. 3.2 System test and control system based on detection and control requirements, the use Ptl00 thermal resistance as a temperature sensor to detect separation of the extraction kettle and the temperature, the use of piezoresistive pressure sensor detects pressure extraction vessel, using Standard cutting device detection flow. the detection signal by the conversion into a 0 ~ 5V loss of potential signal A / D converter, the pressure of the extraction kettle and CO flow is controlled by the PID algorithm, the signal by the D / A converter to control the execution device 4 Conclusion Using PLC technology to supercritical CO. +n +PLC control system design is reasonable, cost-effective, especially in the temperature, pressure and flow overload alarm was set when the interrupt control, the effect is good, to achieve the desired purpose. References: [1] GloynaEF, LiI, McBrayerRN. EngineeringAspectsofSu-percriticalWaterOxidation [J]. Wac. Sc /. Teeh. , 1994,30 (9) :1-10. [2] Tian Xiaojun. Pic teaching experiment of the control panel development and application [J]. Laboratory research and exploration, 2003,22 (2): l26-138. [3] Yuan Xiuying, cattle Hun Sen, Yu Qun Wei. Configuration control [M]. Beijing: Electronics Industry,ghd planchas, Press, 2003. [4] soup with Fan, Ye Zhen, Chen differences, and so on. Electrical and PLC technology [M]. Beijing: Mechanical Industry Press, 2004. E5] Liu Weimin. SCM in supercritical COz extraction device applied research on the [J]. Agricultural and Food Machinery,Scarpe Hogan, 1999,24 (6) :13-17. [6] river and the source, Jiang Ying. Supercritical fluid technology removal of caffeine and green tea catechins research [J]. Food Science and Technology, 2004,25 (2) :95-97. [7] Zheng Ping, Pan Shiyong. Pic event of a cost-effective communication to achieve bit machine [J]. Electronic technology,Hogan Scarpe, 2001,61 (4) :26-46. (Zhang ed.) Received date :2006 -12-16 Author: Zhang Wei (1970), male (Manchu),mac danmark, Dalian, engineers, bachelor, engaged in product development.