Multi-point measurement system and method based on phosphor particle tracer method

Abstract

The invention discloses a multi-point measurement system and method based on a phosphor particle tracer method. The measurement system comprises a pulse injection device, a flash excitation device, aphosphor detection device and a data acquisition and control device. The pulse injection device comprises an injection spray gun, an electromagnetic valve and a gas cylinder. The flash excitation device comprises an excitation ring and a flash lamp tube. The excitation ring and the flash lamp tube are arranged at the downstream part of the injection spray gun and are close to the injection spray gun. The phosphor detection device comprises a plurality of photosensitive elements arranged in different positions of the same cross section in a to-be-detected tube. The data acquisition and controldevice is connected with the electromagnetic valve, the flash lamp tube and the photosensitive elements. Phosphor particles are injected into the to-be-detected tube from the injection spray gun in the form of a material bomb and are excited by the flash excitation device to form a phosphor tracer agent with afterglow, then the phosphor tracer agent is detected by the phosphor detection device toobtain an afterglow intensity signal, and the correction concentration is calculated out. According to the measurement system and method, synchronous multi-point measurement in a gas-solid two-phase flow field can be effectively realized, so that the overall state of the flow field can be reflected more accurately.

Description

technical field [0001] The invention relates to the measurement of gas-solid two-phase flow (including a circulating fluidized bed reactor), in particular to a phosphorescent particle tracer multi-point measurement method and an optimal design of a circulating fluidized bed boiler. Background technique [0002] The two-phase mixing and diffusion behavior of a gas-solid two-phase flow reactor reflects the characteristics of particle motion and distribution in the bed, and is the key to understanding the mass and heat transfer mechanisms in the reactor. Therefore, online acquisition of flow information such as particle concentration distribution and diffusion behavior in the flow field through high-precision and high-reliability gas-solid two-phase flow measurement devices and methods is an important step for the research and development of new high-efficiency and energy-saving two-phase reactors and the optimization of their structural parameters. basis of design. Taking the...

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Problems solved by technology

All of these measurements are based on the assumption of a uniform distribution of tracer particles, which is difficult to achieve under high-speed airflow with the particle distribution devices currently in use

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