共查询到19条相似文献,搜索用时 171 毫秒
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干燥装置典型用能方案的环境负荷分析 总被引:2,自引:0,他引:2
介绍了机电产品绿色设计及生命周期环境负荷评估 ( L CA)的概念 ,指出了干燥装置在使用 (即干燥物料 )过程中的能量消耗是干燥装置环境负荷的主要构成 ,也是干燥装置绿色设计研究的主要内容。在此基础上 ,分别对采用电能、天然气、煤作为能源 ,以及对干燥排气直接排放、用热管回收余热、用热泵回收余热等多种方案中除去湿物料中单位质量水分所造成的环境负荷 ( CO2 排放量 )进行了计算和分析 相似文献
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污泥热泵干燥速率及能耗的实验研究 总被引:1,自引:0,他引:1
利用小型热泵干燥试验台,对污泥干燥过程含水率、空气参数(温度、相对湿度)及热泵参数(制冷工质参数、排水量、能耗等)的变化进行了试验测试,并着重对干燥速率、能量回收率及影响因素进行了分析。试验显示,依靠外热源预热后,污泥干燥过程仅依靠热泵回收的排气余热供热,干燥箱内平均温度可达63℃,最高迭71℃。干燥箱内温度的高低取决于受制冷工况影响的热泵供风温度。污泥干燥速率随空气温度升高和相对湿度的降低而增大,湿基含水率从42.6%到18.74%的平均干燥速率为0.123%/(m·min)。热泵干燥回收排气余热的节能效果显著,并随热泵排水量的增加而增大。平均能量回收率为39.1%,最大值为48.9%和最小值为23.6%,分别发生在热泵排水量最大和最小的阶段。 相似文献
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介绍了热管技术,分析了热管换热器的优点,认为热管式空气预热器可用于回收管式炉低温烟气余热,并进行了热工计算和效益核算。结果表明,热管技术能提高加热炉热效率10.21%,节约焦炉煤气5.08×106m3/a,减排烟气2.9×107m3/a,节能减排效果显著。 相似文献
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移动式相变储热木材太阳能干燥装置的理论设计 总被引:1,自引:0,他引:1
针对木材太阳能干燥间歇性的不足以及传统太阳能储热采用混凝土、天然沸石等通过显热的方式储热体积大、热效率低的缺点,该文进行了移动式相变储热木材太阳能干燥装置的理论设计,并在此基础上完成了实际研制过程。该装置主要包括热管真空太阳能空气集热系统,石蜡相变储热系统,干燥系统,自动控制系统四个部分。该设计不仅能为相变储热式太阳能干燥装置的研制提供理论依据,更重要的是后续实验得出的规律可为进一步开展太阳能干燥技术的研究和工业化应用提供实验指导。 相似文献
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为了解决粮食的晾晒烘干问题,“远弘干燥”对玉米烘干塔进行了技术与设备的资源整合,研发了性能更好,更加高效的顺逆式循环流低温玉米烘干塔,并对其系统组成、烘干流程、热风循环流使用、余热利用、技术参数和经济性进行了介绍和分析。 相似文献
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A solar drier with and without air recycling (Methods I and II) along with a sun drying system (Method III) were used to reduce the moisture content of pistachio from 40 to ~5% (wet basis) at similar weight conditions. Although the ΔT’s of ambient air in Methods I and II reached, respectively, to 18 and 14°C, it did not increase more than 2°C in Method III. The drying air of Method I obtained ~55% more enthalpy from its solar collectors and transferred ~35% more heating energy to the product than the one in Method II. Consequently it’s thermal and pickup efficiencies became, respectively, 40 and 80% more than Method II. Although the highest exergy efficiencies of Methods I and II were equal to each other (~95%), the maximum exergy loss of Method I was higher than Method II due to its higher air temperature and pressure loss (because of continuous air circulation). Although its energy utilization ratio and drying rate were, respectively, 30% more than Method II and 20% higher than Method III, its drying time was 20 and 30% less than the ones in Methods II and III. Overall, the pistachio dried with Method I used much less energy than those dried with other methods and had a higher quality than those dried with commercial driers due to drying temperature <50°C. 相似文献
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Abstract Design features, development, experimental functional performance and economic evaluation of an energy efficient solar energy dryer for commercial production of high-quality hay and processed forage products are presented. The solar hay dryer consists of an improved solar collector with selective coated aluminum absorber plate and spaced fins, and a drying shed connected to the collector by an insulated duct and having a perforated metal grate floor, swing-away plywood frames and polyethylene curtains for effectively sealing the hay stack, and a crawl space below the floor where a 3-hp in-line centrifugal fan is housed for air circulation by suction. In late August and in early September, 1996, 160 small rectangular bales of alfalfa hay with about 25% bromegrass were successfully dried from 33% initial moisture content to 13%, and from 25% to 11% moisture in 4 and 3 days, respectively, under average weather conditions in Saskatoon, Saskatchewan, Canada. With about 18 m3/min per tonne airflow, 10-15 °C temperature rise above ambit was obtained during peak bright sunshine hours. Relatively high daily average collector Effciency of 76%, high drying effectiveness, drying uniformity, uniform air distribution and tight sealing of the stack were achieved which resulted in an attractive green color of hay, no mold growth on hay, and an overall system drying efficiency of about 79%. Compared to a conventional natural gas drying system or field-drying method, the payback period on extra investment costs recovered through drying cost savings of $3/ t to $6/ t or through over two times higher prices for high-quality hay produced by the solar drying system may be just one or two years, respectively. 相似文献
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我国太阳能干燥现状及在热利用中应有的地位 总被引:3,自引:0,他引:3
阐述了我国太阳能干燥的应用与研究概况,列举了谷物、蔬菜与果品、中草药及木材太阳能干燥的部分实例。干燥作业是耗能大户之一,所用能源占国民经济总能耗的12%左右,我国太阳能干燥在热利用中的地位应该引起重视,但我国对太阳能干燥缺乏资金与政策支持,宣传力度不够,因此目前太阳能干燥在我国的推广应用不太理想。论文分析了影响太阳能干燥推广应用的主要原因,提出了促进太阳能干燥发展的几条建议。 相似文献
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论述了国内外褐煤干燥提质技术的发展现状。针对传统热力干燥在褐煤电厂应用中存在的高能耗、高投资和低安全性等问题,开展了褐煤过热蒸汽干燥机理的试验研究和中试试验。结果表明:过热蒸汽的干燥效果优于常规热空气;中试试验系统能稳定、连续地对褐煤进行干燥,且干燥产品符合褐煤干燥实际工业应用的要求。最后提出了过热蒸汽预干燥低质煤提质洁净煤技术(SCU技术),对其在节能、安全等方面的技术先进性作了具体的对比分析,结果表明:SCU技术节能节水、安全性高,符合中国可持续发展战略和节能减排的要求。 相似文献