Immersion on-line multiphase measuring instrument and measuring method

Abstract

The invention provides an immersion on-line multiphase measuring instrument and a measuring method. The measuring instrument comprises a packaging pipe, a window, an LED lamp, a modulable light source, a telecentric lens, an image sensor, a controller, a signal processing and outputting system and a display system, wherein the modulable light source comprises a power supply, a signal generator and an oscilloscope; the LED lamp, the telecentric lens and the image sensor are located in the packaging pipe, and the exposure period of the image sensor is less than the pulse period of the signal generator. A shooting probe used in the measuring instrument is small in size, movable and not prone to influence by fluid temperature and surrounding environments, so the measuring instrument is applicable to real-time, on-line and quantitative measurement of two-phase, three-phase or even multi-phase transparent and opaque systems; and the measuring instrument can capture high-contrast images of flowing of local fluids in a multiphase reactor, and the concentration, granularity and velocity distribution of bubbles, liquid drops, solid particles or the like in multiphase flow flowing at a high speed can be obtained by using the corresponding measure method and professional image processing software.

Description

technical field [0001] The invention belongs to a physical measuring device, and relates to an immersion-type online multiphase measuring instrument and a measuring method. Background technique [0002] In industrial chemical reactors, there are often complex flows, mixing, dispersion, transfer and reactions of different phases. Parameters such as the particle size and concentration distribution of bubbles, liquid droplets or solid particles are the most direct and effective reflection of the internal characteristic information of the reactor, and are the key parameters for the analysis, selection and design of multiphase reactors. [0003] At present, the most commonly used methods for the determination of the distribution of bubbles and solid particles in multiphase flow are the optical fiber probe method based on light reflection and the conductance (capacitance) probe method based on conductance. Many successful applications have been obtained in the research. For exam...

AI Technical Summary

Problems solved by technology

However, these two methods also have some limitations: conductometric probes require the measured phase in the multiphase flow to be a conductive medium; needle-type optical fiber probes are very easy to break and damage the fiber; when there are multiple dispersed phases, the sampling signal will be damaged. Mutual interference, affecting the measurement results

The device images the liquid droplets or liquid films in the area to be tested in a non-invasive manner. Although the problem of image distortion is solved, there are also various shortcomings of the aforementioned non-invasive photography.

[0006] Invasive telecentric photography may be able to solve various shortcomings in the above technologies, but to achieve invasive telecentric photography still needs to be solved: (1) The probe needs to reach a certain length so that it can reach into each of the multiphase reactors. (2) The fluid medium in the multiphase reactor will exponentially attenuate the light intensity, and sufficient light is needed to ensure sufficient exposure when taking pictures; (3) The fluid in the multiphase reactor is flowing at a high speed, Need to solve high-speed moving object capture

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