张卫鹏,郑志安,陈畅,潘忠礼.茯苓真空脉动中试干燥装置设计与试验[J].农业机械学报,2019,50(7):362-371. ZHANG Weipeng,ZHENG Zhian,CHEN Chang,PAN Zhongli.Design and Test of Pilot Pulsed Vacuum Infrared Drying Equipment for Poria cocos[J].Transactions of the Chinese Society for Agricultural Machinery,2019,50(7):362-371.
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茯苓真空脉动中试干燥装置设计与试验 [下载全文] |
Design and Test of Pilot Pulsed Vacuum Infrared Drying Equipment for Poria cocos [Download Pdf][in English] |
投稿时间:2019-01-08 |
DOI:10.6041/j.issn.1000-1298.2019.07.040 |
中文关键词: 茯苓丁 干燥 真空脉动 碳纤维 红外 |
基金项目:国家重点研发计划项目(2017YFD0400905)、现代农业产业技术体系建设专项资金项目(CARS-21)和北京工商大学青年教师科研启动基金项目(QNJJ2019-18) |
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中文摘要:为解决茯苓丁工业化干燥过程中破碎率高、干燥时间长的问题,将碳纤维红外干燥技术和真空脉动干燥技术相结合,设计了基于碳纤维红外板的真空脉动中试干燥装置,以验证该干燥方式实际应用的可行性。该中试干燥装备由干燥室、真空系统、干燥模块、控制系统等组成。将实际真空脉动过程划分为4个阶段:抽真空阶段、真空保持阶段、破空阶段、常压阶段。控制系统以触摸屏为主机,通过MODBUS协议与各从机进行通讯,组成控制器网络。基于对干燥室内真空度的监测,采用时序控制,实现干燥室内“真空-常压”的连续转换。控制系统基于干燥温度的实时监测和反馈,实现对碳纤维红外板加热的有效调控。以12mm×12mm×12mm的茯苓丁为试验原料进行了中试试验验证。结果表明:该中试干燥装备设计方案可行,控制方案可靠,可有效实现茯苓丁的干燥。真空保持时间、常压保持时间分别为5、4min时,干燥时间最短,约为480min。真空脉动红外干燥后茯苓丁一级品占比83.63%,相比目前的连续式热风干燥,破碎率明显降低 |
ZHANG Weipeng ZHENG Zhian CHEN Chang PAN Zhongli |
Beijing Technology and Business University,China Agricultural University,University of California at Davis and University of California at Davis |
Key Words:Poria cocos cubes drying pulsed vacuum carbon fiber infrared |
Abstract:In order to solve the problem of long drying time and high breakage rate of Poria cocos cubes during industrial drying process, the infrared drying technology of carbon fibers was combined with the vacuum pulsating drying technology, and a pulsed vacuum drying equipment was designed based on characteristic carbon fibers infrared plate. The pilot-scale drying equipment consisted of drying chamber, vacuum system, single-layer drying unit and control system. For convenience of analysis, the actual vacuum pulsed process was divided into four stages: vacuum stage, vacuum holding stage, breaking stage and atmospheric pressure holding stage. The touch screen was connected with the slave controllers by RS232/485 to form a network, and communicated with each other through the MODBUS protocol. Based on the monitoring of vacuum degree in drying chamber, the continuous conversion from vacuum to atmospheric pressure in drying chamber was realized by time sequence control. Based on the monitoring of the temperature of carbon fiber infrared board and the feedback of the drying temperature, the drying temperature can be effectively controlled. Poria cocos cubes with size of 12mm×12mm×12mm was used as experimental material to verify the results. The results showed that the design and control scheme of the drying equipment were reliable, and the continuous pulsation of vacuum atmospheric pressure can be realized, and the material can be dried effectively. The shortest drying time was about 480min when the vacuum duration time and atmospheric pressure duration time were 5min and 4min, respectively. Compared with continuous hot air drying, the breakage rate of pulsed vacuum drying was obviously reduced. The drying equipments and results can be applied to the drying of Poria cocos cubes, which can provide theoretical basis for the combined application of infrared drying technology and pulsed vacuum drying technology. |
Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.
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