超临界二氧化碳闭式试验回路压力调节系统

Pressure Regulating System of Closed Test Circuit for Supercritical Carbon Dioxide

超临界二氧化碳具有低黏度、高密度以及良好的流动性等特点。通过闭式试验回路对其特性研究的过程中,试验回路的压力调节是一个重要方面。介绍了压力调节技术、压力调节系统组成,基于PLC控制系统、bang_bang控制原理、脉冲宽度调制和脉冲序列输出技术,以柱塞泵、电磁阀、压缩机等为主要设备,设计了一套压力调节系统。介绍了压力调节工艺流程及控制系统组成、压力调节原理及过程。经过系统设计和理论分析,可实现超临界二氧化碳闭式试验回路压力的远程、连续、精确调节。为类似闭式回路压力调节提供一种可行思路和方法。

Supercritical carbon dioxide has the characteristics of low viscosity,high density and good liquidity.In the process of studying its characteristics through a closed test circuit,the pressure regulation of the test circuit is an important aspect.Introduced pressure regulation technology,composition of pressure regulation system,based on PLC control system,bang_bang control principle,pulse width modulation and pulse sequence output technology,with plunger pumps,solenoid valves,compressors,etc.as the main equipment,a pressure regulation system has been designed.Introduced the process flow and control system composition of pressure regulation,as well as the principle and process of pressure regulation.Through system design and theoretical analysis,it can realize remote,continuous and accurate regulation of supercritical carbon dioxide closed test circuit pressure,providing a feasible idea and method for similar closed circuit pressure regulation.