Design And Experimental Study Of Artificial-snow Of Ice Slurry

In response to the country’s call of "300 million people on ice and snow",more and more national snow and ice programs have been carried out,and more and more snow requirements have been raised.Natural snowfall is usually not enough to meet ski resort snow requirements,and in recently global warming has reduced snowfall,lead to increasing the need for artificial snow.Traditional artificial snow production requires working environment below0℃,which makes it difficult to set up ski resorts in southern China.Artificial snow-making technology above 0℃ is commonly used to make ice instead of snow,among which sheet ice and sheet ice are the most common,with high cost and high energy consumption.The purpose of this project is to design a snow making system which can realize all-day snow without the restriction of working temperature.According to the design and experimental study,the system has the advantages of low energy consumption,environmental protection and high quality.Firstly,according to the theoretical analysis and actual demands,the system of ice slurry snow generating is designed.the super-cooling method is chosen to get the ice slurry.Meanwhile,the medium circulation process is designed and the cooling capacity is calculated,The design and selection of the ice main engine,heat ex-changer,refrigerant-carrying buffer tank and the device to prevent ice blocking are performed.The solid-liquid separation is carried out by gravity settling,and the separation device is designed according to the theoretical calculation results.Then,the snow is transported to the application site by lowtemperature wind to ensure that the snow does not melt during transportation.Secondly,the test bench is built and preliminary experiments are conducted as original design.The cooling curve is measured,and the temperature difference between the inlet and outlet of ethylene glycol and super-cooled water is obtained.Ice blocking experiment on the plate heat ex-changer is carried out to measure the flow of cooling water,ethylene glycol solution and super-cooled water.It can be seen that when the temperature of the system without imported heating regulator reaches 0℃,ice blocks occur in the heat ex-changer,followed by the automatic shutdown of the main refrigerating unit and the beginning of the ethylene glycol defrosting pump.The system with imported heating regulator can operate normally with minimal flow fluctuation.The ice slurry is then pumped to the separator for separation,and the snow yield and IPF are measured.It is found that the output meet the design requirements However it is not dry enough,the IPF of the ice slurry then should be increased.Then,in order to improve the separation efficiency,the separation device is designed and compared again.The storage device is integrated with the separation device which can reduce the storage time,pumping process and greatly improve the separation efficiency.In addition,the control experiment of the screw lifter in the ice storage separator is carried out to measure the snow density at different heights in the separator.By starting and stopping the screw lifter at different times,the snow density after separation is more uniform.In actual engineering application,two ice storage separators are used in parallel to effectively reduce separation holding time and improve production efficiency.Finally,exergic analysis is performed according to the operation data of the system.Exergy balance equation is established to calculate exergy loss and exergy efficiency,then exergic efficiency of the whole is calculated.Exergy analysis can grasp the energy utilization situation more accurately.Based on the analysis results,feasible optimization measurements are put forward to provide theoretical support for future engineering application.