Chinese Academy of Sciences

Nanjing Jiuzhang Chemical Technology Co., Ltd.

Guanqi Wang

Xiangyang Li

Chao Yang

Zaisha Mao

Shifang Yang

Haoliang Wang

The present invention provides an online measuring method of particle (such as bubbles, droplets and solid particles) velocity in multiphase reactor. The method based on an online multiphase measuring instrument includes the following steps: (1) the online multiphase measuring instrument is placed into the multiphase reactor, and then a particle image produced by two or more exposures are obtained; (2) the actual size of individual pixel in the particle image is determined; (3) valid particles are determined in the depth of field; (4) then the centroid coordinates are conversed to the actual length of the coordinates (x, y) and (x, y) using the actual size of individual pixel. Thus, the instantaneous velocity of particles can be calculated by The method can realize real-time measurement of the velocity distribution of bubbles, droplets or solid particles in a multiphase reactor, and the measurement accuracy is high.

Online measuring method of particle velocity in multiphase system

An online multiphase measuring method of concentration and diameter distribution of dispersed phase particles in a multiphase reactor is provided in the present invention. The method is based on an online multiphase measuring instrument. The method described herein includes the following steps: (1) the online multiphase measuring instrument is placed in a multiphase system, and an image of the particles in the multiphase system is obtained; (2) valid particles are determined as: the particle that its Grad(&#x3a6;) is greater than or equal to Grad(&#x3a6;) is labeled as a valid one; (3) the particle diameter is calculated by d=10&#xd7;n/N; according to the equation the concentration of the valid particles is calculated. The concentration and diameter of bubbles, droplets or solid particles can be obtained in real time and online measurement. The accuracy of this method is high.

Online measuring method of concentration and diameter of particles in multiphase system

Provided are an immersion-type online multiphase measuring instrument and method. The instrument includes a package tube; a viewport; LED lamps and a brightness-adjustable light source system including a power supply, a signal generator and an oscilloscope; a telecentric lens and an image sensor; a controller; a signal processing and outputting system; and a display system. The LED lamps, the telecentric lens and the image sensor are located in the package tube. The exposure period of the image sensor is less than the pulse period of the signal generator. The photographic probe used in this measuring instrument has the advantages of online quantitative measurement, small size, portability, less-impact of fluid temperature and the surrounding environment, adaptability to transparent and opaque reactors with two-phase, three-phase and more than three-phase.

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Beijing, China

Guanqi Wang