| The industrial water consumption in power plant is huge,in which the cooling tower water consumption accounts for a large proportion.The water collector is installed in cooling tower in order to reduce water loss.Most of the current water collectors are corrugated water collector made of PVC material.In the actual operation environment,this collector is demanding for high maintenance cost,water collection efficiency of which is low,and the material is easy to be damaged and fall off,which results in water resources waste.For the complex environment of gas-liquid two-phase flow in the cooling tower,the structure design and property study of fiber composite collecting device were conducted in this project.In this paper,collision and coalescence mechanism of tiny droplets in the vortex environment was analyzed,the water-saving reuse principle of the circulating cooling water coupling was descripted in meso scale;coalescence special function of the vapor-liquid two-phase vortex environment was programed and embedded in software"FLUENT";at the same time,to meet the demand for mechanics of collector,the structural design of the fiber composite water collector was conducted;by research methods combining numerical simulation and physical experiment,physical experiment system of the cooling towerand swirl water captation is established,it was believed that boundary parameters of coalescence kernel function of the numerical calculation should be are optimized by macroscopic physics experiment.For hot and humid environment of saturated vapor in the cooling tower of power plant,under the condition of meeting every index of the water captation,structural design of the fiber composite and its device was conducted.The 30%volume content of short-cut long glass fiber reinforced polypropylene composites was selected.Through testing,its tensile,bending and anti moisture aging properties were all better than that of the traditional PVC materials.According to Froude similarity theory,experimental platform of natural draft counter flow wet cooling tower was built by 50:1,for real-time monitoring and statistical analysis of macro experimental data,such as velocity in tower,pressure,temperature and humidity,water collection rate and water quality of,in which the accuracy and reliability of the model were verified;water collection rate and recycling water quality change water captation under different conditions were tested through the experimental platform;test results showed that,compared with that in traditional corrugated plate captation,the water collection rate increased more than 14%in the new swirl captation,and the content of suspended solids in recycling water decreased more than 50%,which verified the good effect of collecting water for tiny liquid drops with a diameter range of 5?50 microns within the "critical state" by the new water captation,which can effectively improve the circulating water quality at the same time.The coalescence mechanism of tiny droplets in the cyclone environment was obtained,and a special coalescence kernel function was established to instruct the design of fiber composite collector.According to different application environment and requirements,energy-saving and high efficient collector made of fiber composite can be customized,in which the water saving rate and service life would be improved.It can be widely used in various industries using the cooled water circulation system,which is of great significance for the saving of the industrial water. |
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