Optimization of a novel measurement technique for the simultaneous measurements of gaseous and liquid species compositions and phase volume fraction

多相过程（即，气-固、液-固、气-固和气-液-固）已经普遍用于许多工业领域，例如化学、石化、制药、能源、纸浆和造纸以及食品。这些系统可以通过测量化学物质组成和相体积分数来表征，以在工业和实验室中成功地控制、优化和故障排除。这两个参数是相互依赖的，同时通过系统流体力学和反应动力学耦合。多相系统的流体动力学通常以不同区域的不同固体浓度和物种组成为特征。此外，在反应体系中，固体体积分数通过非均相催化和/或抑制效应影响化学反应。在气-液-固流化床的情况下，借助于单一测量技术同时测量不同相的体积分数被认为是有问题的，主要是由于难以区分来自固体和气泡的信号。因此，同时和现场测量的气体/液体的物种组成和不同阶段的体积分数是至关重要的多相过程表征。

Multiphase processes (i.e., gas-solid, liquid-solid, gas-solid, and gas-liquid-solid) have been commonly employed in many industries in such areas as chemical, petrochemical, pharmaceutical, energy, pulp and paper, and food. Theses systems can be characterized through the measurements of chemical species composition and phase volume fraction to arrive at the successful control, optimization, and troubleshooting in the industries and laboratories. These two parameters are dependent while coupled through the system hydrodynamics and reaction kinetics. The hydrodynamics of multiphase systems are often characterized by different regions of varying solids concentration and the species composition. In addition, in a reactive system, solids volume fraction influences chemical reaction through heterogeneous catalytic and/or inhibitive effects. In the case of a gas-liquid-solid fluidized bed, the simultaneous measurement of volume fractions of different phases was considered problematic with the help of a single measurement technique principally due to the difficulties in differentiating between the signals from solids and the bubbles. Therefore, the simultaneous and in-situ measurements of gas/liquid species composition and the volume fraction of different phases are critical to the multiphase process characterization.