摘要
国内对粮堆籽粒间隙空气特性的研究相对较少。中温带地区4132 t小麦高大平房仓,在2019年12月2日~30日,采用2台1.1 kW的轴流风机进行上行吸出式智能间歇式通风,实际通风时数为286 h,而理论通风时数为279.4 h(焓值差校正因子为1.0),粮堆平均温度降低了14.3℃,粮堆水分基本不丢失,单位能耗为0.0085kW·h/(t·℃),与同条件下非间歇式通风降温相比节约能耗40%。通风过程中全仓平均最高粮温对应的相对湿度RH由61.1%降低到56.4%,含湿量由14.9 g/kg降低到5.8 g/kg,露点温度由20.2℃降低到6.2℃;全仓平均最低粮温对应的RH由53.7%降低到50.4%,含湿量由3.5 g/kg降低到2.0 g/kg,露点温度由-0.8℃降低到-8.4℃;全仓平均粮温对应的RH由58.9%降低到53.4%,含湿量由9.5 g/kg降低到3.4 g/kg,露点温度由13.3℃降低到-1.5℃。这些指标对粮食智能化精准通风控制具有参考价值。
Few studies in domestic deals with the properties of intergranular air in grain bulk.This study was carried out in 4132 t of wheat bulk in a large warehouse locating in medium temperate region during 12/2 to 12/30/2019.Two axial fans were used to upward aerated,and the average temperature in wheat bulk was decreased14.3℃without moisture loss.The real aeration hours were 286,the unit energy consumption was 0.0085 kW·h(t·℃),and 78%energy was saved,with a theoretical aeration hours were 279.4 and a correct fator of enthalpy difference was 1.0.The changes in relative humidity(RH),humidity ratio,dewpoint temperature(Tp)in grain bulk were,RH decreased from 61.1%to 56.4%,humidity ratio decreased from 14.9 g/kg to 5.8 g/kg,Tp de-creased from 20.2℃to 6.2℃,for the average of maximum temperature in whole bulk.RH decreased from 53.7%to 50.4%,humidity ratio decreased from 3.5 g/kg to 2.0 g/kg,Tp decreased from-0.8℃to-8.4℃,for the average of minimum temperature in whole bulk.The corresponding RH decreased from 58.9%to 53.4%,humidity ra-tio decreased from 9.5 g/kg to 3.4 g/kg,Tp decreased from13.3℃to-1.5℃,for the average temperature of whole bulk.These indexes could be used in smart accurate aeration control in grain bulk.
作者
闫恩峰
姜玉山
薛德军
李兴军
YAN Enfeng;JIANG Yushan;XUE Dejun;LI Xingjun(Shandong Pingyuan Longmen Depot of Grain Reserve,Pingyuan 253100 Shandong,China;Changping Pilot,Academy of the National Food and Strategic Reserves Administration,Beijing 102209,China)
出处
《粮食加工》
2021年第1期73-77,共5页
Grain Processing
基金
山东省农业重大应用技术创新项目SD2019ZZ012-4。
关键词
粮粒间隙
空气特性
白小麦
降温通风
含湿量
intergranular
air properties
wheat
cooldown aeration
theoretical aeration hours
humidity ratio
dewpoint temperature
