Device for monitoring spatial evaporation characteristic of micro-droplets in high-temperature airflow on line

Abstract

The invention provides a device for monitoring the spatial evaporation characteristic of micro-droplets in high-temperature airflow on line, and the device comprises a heating system which is providedwith a heating hearth and a heating element installed in the heating hearth; transparent observation windows, arranged on two opposite sides of the heating hearth, and a gas inlet and a gas outlet being respectively formed in the top and the bottom of the heating hearth; a gas inlet system, connected to the gas inlet of the heating hearth through a pipeline and used for providing atmosphere required in the furnace and controlling the gas flow rate and the gas preheating temperature in the furnace, so that the interior of the furnace is in a negative pressure state; a micro-droplet jetting system, comprising a micro-droplet nozzle arranged at the top of the heating hearth and used for generating micro-droplets; a holographic measurement system, used for measuring the evaporation conditionof the micro-droplets in the furnace body in the vertical falling process and recording holographic images. The device comprises a laser generator for emitting micro-droplet irradiation light beams, an electric lifting platform for driving the laser generator, and a camera for collecting holographic images.

Description

technical field [0001] The invention relates to a high-temperature device for scientific research on micro-droplet evaporation in the fields of energy, combustion, and environmental protection, and in particular to a device for on-line monitoring of space evaporation characteristics of micro-droplets in high-temperature airflow. Background technique [0002] In the fields of energy, combustion, and environmental protection, etc., the evaporation process of micro-droplets is often involved. In industrial applications, the evaporation process of micro-droplets plays an extremely important role in the treatment of desulfurization wastewater using flue waste heat, rotary spray drying, selective non-catalytic reduction denitrification technology, and the combustion of liquid fuel droplets. The research on the evaporation process of micro-droplets with different physical properties is a difficult point in the study of the mechanism of the evaporation process. Therefore, there is a...

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Problems solved by technology

The main problems of this technology are: serious dust accumulation in the desulfurization tower, corrosion of equipment in the tower, insufficient reaction of flue gas and slurry in the tower, and SO 2 The concentration is unstable and the fluctuation range is large

[0006] At present, most studies on the evaporation law of micro-droplets use the analysis methods of hanging drop method, heating plane evaporation, thermogravimetric analysis and evaporation coefficient, without considering the particle size and three-dimensional space changes of the actual micro-droplets, and without considering the influence of gravity on micro-droplets. The influence of motion, without considering the convective heat transfer of liquid droplets in the evaporation process in high-temperature airflow

In addition, most of the research focuses on the atomization and evaporation of micro-droplet spray. There are few studies on the evaporation characteristics of a single micro-droplet in a heated atmosphere, and there is still a lack of dynamic process of gas-liquid reaction of micro-droplets. Research

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