Research On The Collaborative Drying Technology Of Solar Energy For Poplar Veneer

Veneer is the basic unit of plywood.In the production process of plywood,the energy consumption of veneer drying is relatively high.The application of solar drying and coordinated heat storage or dehumidification drying in the veneer drying process has practical significance for improving the veneer drying efficiency and drying quality,promoting the practical application of veneer energy-saving drying technology,and reducing energy consumption in the production process of plywood.In this study,in a small top-wind solar drying room,the wind field in the drying room is simulated by CFD software,and combined with the actual situation to verify.Explore the optimal wind speed conditions in the drying room,and use this solar energy cooperative heat storage device or dehumidifier to dry poplar veneers of different thicknesses.By comparing and evaluating the drying rate,drying quality and energy consumption of the veneer under different drying conditions,a more optimized drying process was explored.The main findings are as follows:?The photovoltaic room performance test results of the solar room show that the daily average photovoltaic power generation capacity of the solar power generation system is 9.21 k W·h,and the average daily power consumption of the system is 8.14 k W·h,which can meet the energy consumption requirements of the drying room fan.Solar photothermal performance test results show that,compared with atmospheric drying,pure solar drying,heat storage cooperative solar drying,and dehumidification cooperative solar energy can significantly increase the temperature in the drying room,and the average temperature increases by 20?,21?,and 25?.?The simulation and optimization results of the wind speed field of the single-plate solar drying room by CFD software show that when the wind speed between the fans(top wind speed)is 5m/s and the distance between the stack and the side wall is 0.4m,the The distribution of dry media flow field is the most reasonable.At this time,the average wind speed flowing through the pile is 2.53m/s.The simulation accuracy is high,and the error value is below 6%.? Atmospheric,pure solar energy,heat storage synergy solar energy,dehumidification synergy solar energy drying conditions,veneer drying rate results show that,compared to atmospheric drying,pure solar energy,heat storage synergy solar energy,dehumidification synergy solar energy to dry veneer can significantly improve the single the speed of board drying.The drying time was shortened by 25.5h,26.5h and 29.0h respectively,and the drying rate was increased by 5.87%/h,6.72%/h and 9.91%/h on average per hour.When the thickness of the veneer increases,the average rate of decrease of the moisture content per hour of the veneer from low to high is: atmospheric drying<pure solar energy<heat storage synergy solar energy<dehumidification synergy solar energy.? Under the conditions of atmospheric drying,pure solar energy,heat storage synergy solar energy,and dehumidification synergy solar energy,the veneer drying quality results with thicknesses of 2.0mm,3.0mm,and 4.0mm show that when the veneer thickness increases,the final moisture content of the veneer drying increases,and some defects are reduced.The introduction of a heat storage system and a dehumidification system in the solar drying chamber can reduce the occurrence of defects in the solar drying process of the single board.When the solar dehumidification and drying are coordinated,the drying defects are the least and the quality is optimal.? The theoretical calculation and analysis results of energy consumption in the drying process of pure solar energy,heat storage synergy solar energy,and dehumidification synergy solar energy show that the introduction of heat storage system and dehumidification system on the basis of solar drying can improve energy utilization efficiency.Compared with pure solar drying and heat storage cooperative solar drying,dehumidification cooperative solar drying solar energy utilization efficiency is higher.