Wheat Drying System Based On The Real-time Utilization Of Diesel Engine Waste Heat

At present,the wheat combine harvester in our country does not have the independent drying function,and the diesel engine equipped with the combine harvester produces only about 35% of the effective work,waste gas,cooling water away most of the energy,and waste gas away the waste heat quality is higher,if this part of the energy is used,not only saves resources,but also can realize the preliminary drying of newly harvested wheat,prevent mildew deterioration caused by not drying in time and other grain damage.Based on the waste heat utilization of diesel engine,a wheat drying oven was designed and used to dry wheat.the heat source for drying wheat was from the waste heat of diesel engine exhaust gas.This part of energy occupies a large proportion in the waste heat of diesel engine and has high quality.(1)In this paper,a theoretical study on wheat drying experiment based on diesel engine waste heat utilization is carried out.the temperature range of diesel engine waste heat is 301 ?-328 ?,and the suitable temperature range of drying wheat is 40?-70 ?.through calculation,and it's found that the waste heat energy of diesel engine waste heat is 1345.8 KJ,and the heat required to reduce the water content of wheat to 20 % is 32.94 KJ when hot air at 55 ? is introduced into the drying oven.the energy carried away by diesel engine waste heat is far greater than the energy required to dry wheat.through theoretical research,it is found that the waste heat of diesel engine waste heat can reach the required temperature of drying wheat and meet the energy required for drying wheat.(2)The design,manufacture scheme,material selection and working principle of wheat drying oven based on diesel engine waste heat real-time utilization technology are introduced in detail.The top and bottom of the drying oven are respectively provided with a feeding port and a discharging port.The inside of the box body is staggered with three downward-turnover material bearing baffles in the vertical direction.the baffles are fixed on two sides of the box body,and the lower part of the baffles is provided with limited bolts,and the bottom and two sides of the box body are provided with air inlets for introducing hot air.,that wheat is automatically overturned by the self weight of the wheat,the limit bolt at the bottom of the baffle can prevent the adjacent baffle from contacting,the heating time is adjusted by adjust the length of the bolt to change the inclined angle of the baffle,the effective drying of the wheat is ensured,and the honeycomb air outlet is designed at the top of the drying box to ensure that the hot gas in the box body is fully dispersed.Finally,the model of wheat drying oven was established,and the design scheme of wheat drying oven based on diesel engine waste heat utilization technology was determined after many modifications.Using ANSYS software to simulate the wheat drying oven,get the temperature field distribution diagram inside the drying oven,simulation analysis results show that the temperature field distribution inside the drying oven is uniform,as far as temperature is concerned,is conducive to wheat drying experiment,at the same time shows that the design of the drying oven is reasonable.Then the material is humidified manually,the experiment equipment is debugged and the experiment is carried out.(3)Single factor experiment analysis method was used to set the hot air temperature,baffle tilt angle and drying time as variable factors,and other experimental factors were set as specific values to carry out the hot air drying experiment of wheat.The drying curves of wheat under different hot air temperature,different angle of baffle and different drying time were obtained.The results showed that the optimum temperature for drying wheat was about 55 ?,and the optimum inclination angle of baffle was 23.25°.with the increase of drying time,the drying efficiency gradually increased,and the drying time decreased with the increase of drying temperature.The moisture content of wheat was reduced from 26 % to 20 % after drying in a drying oven.the experimental data showed that the waste heat of diesel engine could be used to dry wheat preliminarily.The effects of various experimental factors on wheat were analyzed.through data analysis,the drying oven of wheat was optimized and the experimental conditions were improved...