基于CCERT与声发射技术的气液固三相流相含率测量

传统的相含率测量方法在测量三相流相含率时只能对某单一相进行检测,针对此问题,基于电容耦合电阻层析成像(CCERT)技术与声发射技术,建立了相含率测量模型,提出了一种三相流各相相含率的非侵入式测量方法。利用偏最小二乘回归法,在静态情况下建立CCERT技术的相含率测量模型,同时在鼓泡床上进行动态实验,采用差压法进行同步测量作为参考值验证模型的有效性,实现了对两相相含率的非接触测量。在此基础上,通过对声发射技术采集到的声音信号进行处理,建立声发射技术的气相相含率预测模型,利用该模型测量出三相体系中的气相相含率,结合CCERT技术测量出三相体系中的不导电相相含率,从而利用非侵入式测量方法得到三相流中的各相相含率。

Measurement of phase holdup in gas-liquid-solid three-phase flow based on CCERT and acoustic emission

The traditional method to measure the phase holdup of three-phase flow is only for some single phase. In order to solve this problem,models to predict the phase holdup were established and a non-invasive method was proposed for the measurement of each phase holdup in three-phase flow based on capacitively cou-pled electrical resistance tomography (CCERT)and acoustic emission. Firstly,the phase holdup measurement model of gas-water two-phase flow was established by using partial least squares regression method in the static case. Meanwhile,the dynamic experiments that compare the method with the differential pressure method to verify the validity of the modelwere carried out on bubbling bed to fulfill the non-invasive measurement of the two-phase phase holdup. On this basis,the measurement model of gas holdup was established through process-ing the sound signals collected by acoustic emission system. Then,the gas holdupis measured in three-phase system by using the model and is combined with the non-conductive phase holdup measured by CCERT. Thus each phase holdup in three-phase flow is obtained in a non-invasive way.