脱水菜隧道干燥设施的节能设计研究

脱水菜企业普遍使用风机顶置逆流隧道式干燥设施,其热效率较低,仅有40%。通过对各生产环节热损失分析后,新设计的风机直对逆流和混流两种隧道干燥设施热效率分别达到58%和68%。文中提供了已做和进一步可做的提高热效率的方法。

太阳能干燥设施内的结露及预防系统

解决太阳能干燥设施内高湿条件下的结露问题是应用和推广太阳能谷物干燥技术的难点之一。经研究分析认为,只要能抑制内壁表面结露现象,就可基本上解决干燥设施内的结露问题,在此基础上,建立了太阳能干燥设施内结露预防系统。初步试验表明,该系统利用换气、加温或换气与加温组合的方法来预防太阳能干燥设施内的结露现象,其效果是明显的,而且具有节能、操作简便等优点。该项研究对太阳能干燥技术的改进和完善有一定的意义,且具有潜在的技术价值和应用前景。

品种资源库种子干燥设施相对湿度指标设定应注意的问题

一般品种资源库保存的种子,在入库以前都要求将种子进行干燥,使其含水量降到一定范围之内。为此,资源库都配备有种子干燥设施,如干燥室、干燥箱等。由于种子含水量与种子所处环境的相对湿度有关相互影响而趋于平衡的关系。

硝酸铵气流干燥设施的设计与实践

气流干燥硝酸铵是粉状炸药加工中常见的生产工艺方法．文章根据气力悬浮运输和热力学理论，结合作者的实践，从设施布局原则到参数的确定，提出了一套简单、完整、可行的设计过程．

日本的谷物干燥技术发展趋向

日本是世界上唯一的以稻谷生产为主实现了农业机械化的发达国家，稻谷收获后的干燥处理加工技术研究排在农业机械化研究的最前列。其谷物干燥技术的发展是经历了自然干燥→半机械化干燥→机械化干燥→程控全自动机械化干燥后，步入了90年代的新技术、新系统时代。本文介绍在这一发展过程中，日本谷物干燥技术的变迁和干燥设施的普及实况，以促进我国农产品干燥加工技术的进一步发展。

日本对农业机械和设施的研究

日本农业机械化和设施化的水平和程度很高,其拖拉机每公顷平均数为9马力,居世界第1位;第2位是联邦德国7马力,第3位是法国4马力。日本有400万农户,耕地面积只不过是560万公顷。

日本金子谷物干燥技术考察

应日本国金子农机株式会社邀请,受山西省农机局的委派,我们于1996年9月24日至10月3日专程赴日进行了为期10天的技术考察,重点是金子谷物干燥技术及设备。一、金子谷物干燥技术发展状况金子农机株式会社是日本干燥机械生产较早。

Experimental Study on Hydrothermal Drying for Sewage Sludge in Large-Scale Commercial Plant

The study was conducted to demonstrate the performance of the large-scale commercial plant of the hydrothermal drying of sewage sludge. Its performance was compared with that of the small-scale pilot facility to confirm the scaling effect of the facility. It has been shown that the optimum reaction temperature was 190℃ and reaction time was 30 minutes for both facilities. The dehydration performance of the products of the hydrothermal treatment and the natural drying performance of the dehydrated residue were almost the same for both facilities, which demonstrated that the small-scale pilot facility could simulate the commercial-scale plant well. With these optimum hydrothermal reaction conditions, the moisture content of the dehydrated product was less than 40% by the use of the frame filter, which had better dehydration performance than the centrifuge dehydrator. The moisture content of the dehydrated solid residue could be reduced less than 20% and 10% after 24 hours and 48 hours natural drying, respectively. The solubilization rate of sludge into the dehydrated liquid was 10% and 90% of the solid content in the raw sludge could be recovered as a dry solid fuel by this process with reduced energy requirement compared with conventional thermal drying processes. Too high reaction temperature or too long reaction time increased the content of solid material in the dehydrated liquid （solubilization rate of sludge） and reduced the yield of the dry solid fuel.