Mechanism And Experiment Of Heat And Mass Transfer Between Air And Water In Foam Ceramic Packing

China produces about 22 million tons of ceramic polishing waste residue every year,of which only 10% is recycled.Most ceramic factories use landfill to deal with polishing waste residue,which not only consumes manpower and material resources,but also pollutes underground water quality,resulting in great waste of resources and environmental pollution.Ceramic polishing waste residue has become the ceramic industry most difficult to use,but also the use of the least waste.Evaporative cooling is a kind of uses natural working medium promoting the high-quality development of China’s energy and achieving the goal of carbon peak and carbon neutral.Therefore,this thesis proposed to upgrade the polishing waste residue into ceramic filler and apply it to the field of air conditioning and refrigeration,in order to give new value to the recovery and utilization of ceramic polishing waste residue.The main research contents of this thesis are as follows:(1)Packing is the core medium of evaporative cooling technology.Firstly,the heat and mass transfer mechanism,material properties and research methods of the filler were analyzed and studied.It is considered that the high specific surface area,high porosity and good wettability of porous ceramic filler are very beneficial to evaporative cooling.Therefore,the porous ceramic filler of polishing waste residue is selected to carry out theoretical and experimental research on its performance.(2)Investigate and analyze the chemical composition and phase composition of the porous ceramic filler of polishing waste residue,explore the preparation process and mechanism of the porous ceramic filler of polishing waste residue,study the heat and mass transfer mechanism of the porous ceramic filler of polishing waste residue from the material level,and lay a theoretical foundation for the subsequent experimental research.(3)Design and build a test bed for porous ceramic packing with polishing waste residue for evaporative cooling.Using heat transfer and fluid mechanics knowledge,the indirect and direct evaporative cooling unit test system design and calculation of main equipment in the system for the calculation and selection,focus on the ceramic packing section area,packing to drench water,joining together to carry on the design and calculation of porous ceramic filler,implements the ceramic filler piece to the transformation of forming ceramic packing,completed the evaporative cooling polished waste residue of porous ceramic packing test system.(4)The performance of the new porous ceramic filler with polishing waste residue for evaporative cooling was tested under different working conditions on a test bed.Under the condition of the dry bulb temperature of the inlet 15.5℃ and the wet bulb temperature10.84℃,the evaporative cooling efficiency of the new ceramic packing could still reach75.2%.The work done in this thesis is expected to bring new vitality to the research of porous ceramic filler for evaporative cooling,is expected to realize the "waste into treasure" of ceramic waste,and open up a new way for the low-carbon and clean development of ceramic industry.It is the application of "reuse" in the "3R" principle of circular economy in the field of refrigeration and air conditioning.There are 41 diagrams,12 tables and 109 references in this thesis.