共查询到19条相似文献,搜索用时 109 毫秒
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近些年来,几乎用于所有纸种的纸机车速都在不断增加.因为传统干燥能力与车速成正比,这会导致越来越长的干燥部和抄纸车间,以及与此相关的越来越高的投资费用.此外,纸幅离开烘缸的剥离点的不断增加会造成运行性能不佳.在过去的10年中,采用单毛毯干燥部同样引起了干燥部不断加长的趋势,其运行性能比双毛毯干燥部要好.这就是为什么要研究较有效干燥方法的原因,其中穿透干燥是最有希望的解决方法之一. 相似文献
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蒸汽喷射式热泵在多段通汽系统中的应用 总被引:1,自引:1,他引:0
在造纸企业,纸机干燥部蒸汽消耗占纸的生产成本5%~15%。因此,在纸机干燥部进行节能是非常必要的。近几年,蒸汽喷射式热泵在纸机干燥部多段通汽系统中得到了广泛应用,在节能降耗方面取得了显著效果. 相似文献
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介绍了泰国Inter Pacific纸厂纸机干燥部改造总承包工程的具体改造内容,对比了改造前后的运行效果,解决了干燥部传动负荷大的问题,提高了干燥部干燥能力,达到了预期效果。 相似文献
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纸机干燥部循环润滑系统关键控制参数的研究 总被引:1,自引:0,他引:1
介绍了纸机干燥部循环润滑系统的组成,分析了水分和温度对纸机干燥部润滑油性能的影响,对纸机干燥部润滑系统中水分的危害进行了探讨,进一步提出了对纸机干燥部循环润滑系统关键参数进行控制的必要性和潜在价值。最后,对纸机干燥部润滑系统关键参数的控制进行了研究。 相似文献
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JAN PÍSECKÝ 《International Journal of Dairy Technology》1981,34(2):57-62
A survey is presented of various processes and spray drying installations for obtaining skimmed milk powders with desired qualities. The spray dryers discussed are: spray dryer with pneumatic conveying system, two-stage drying system, spray dryer with cooling bed, and spray dryer with straight-through instantizer. The rewet agglomeration process is also described.
The second part deals with the most important final product properties (moisture, bulk density, and solubility index) and with the parameters controlling them.
In the third part the possibilities are discussed of saving energy and reducing stockloss. Two types of heat recuperators (air-to-air and air-to-liquid-to-air) and wet scrubber are described. 相似文献
The second part deals with the most important final product properties (moisture, bulk density, and solubility index) and with the parameters controlling them.
In the third part the possibilities are discussed of saving energy and reducing stockloss. Two types of heat recuperators (air-to-air and air-to-liquid-to-air) and wet scrubber are described. 相似文献
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从流送系统、流浆箱、网部、压榨部、干燥机、施胶机、热回收等方面介绍了琥珀纸业进口箱纸板机的参数、配置、特点及优势,如纸机流送系统的浆池具有容积小的特点,使纸机转换产品品种时的时间缩短;浆料净化使用中浓除渣器,使浆料净化的能耗降低;该纸机流浆箱无唇板温控系统,施胶机上料管无温控系统,该新设计不仅观念新,同时使系统简化、投资降低、操作简单、能耗降低;该纸机的气罩设计露点为64℃,运行露点为62℃,其高露点设计为干燥机节能创造了条件。 相似文献
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S Gunasekaran 《Critical reviews in food science and nutrition》1986,25(1):1-48
Grain drying is very specific to the geographic location, kind of drying system, and the type of grain. Under a given set of conditions, the optimal system can be selected based on careful evaluation. However, a good choice of drying systems, procedures, and management practices can be made from the information already available. The review of several grain-drying procedures has provided some insight in making a quick evaluation of the process and arriving at the most suitable system for a particular application. Despite extensive research efforts, the present knowledge of grain drying is yet insufficient to optimally design each drying process with respect to capacity, quality, and energy requirement. There is a need for incorporating grain and air parameters more accurately. It is also important to develop comprehensive drying simulation models to encompass agronomic practices, such as planting and harvesting. Recent efforts indicate a strong influence of planting and harvesting strategies on optimal drying and storage system selection. Results of the varietal trials at Ohio State University indicate that it is now possible to select midseason varieties, which dry down rapidly, without sacrificing yield. Also, low moisture at harvest is important to the energy management process because it affects total drying time and energy required. It is also important from a quality standpoint because kernel damage increases rapidly at harvesting moisture levels above 25%. The trend in grain-dryer design has shifted from focusing on drying capacity and operation reliability to energy consumption. The development in design of energy efficient continuous-flow dryers has been significant. Multistage concurrentflow dryers are excellent examples. Various aspects of dryer staging for efficient operation and control are yet to be determined. Recirculation of the exhaust air is a proven method of improving energy efficiency. Likewise, in batch-in-bin systems, stirring and intermittent drying are worth considering. Further research is required to formulate the best procedures for exhaust air recirculation and intermittent drying. Low temperature drying has a great potential in the U.S. corn belt. The suitability of low temperature drying at other places and for grains other than corn has not yet been well established. Energy savings resulting from low temperature drying entail careful planning and management on the part of the operator. Poor design and operation can result in a serious deterioration in grain quality.(ABSTRACT TRUNCATED AT 400 WORDS) 相似文献
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针对小颗粒(含粉料)状物料干燥方式简单,热利用率低、获得的物料干制品质量得不到有效保障的问题,利用射频给热技术,设计了针对小颗粒(含粉料)物料中试射频干燥机。该设备由给热系统和输送系统两部分组成,给热系统主要包含射频发生器和翅片加热管,输送系统的主要传送部件为输送带。同时为保证射频干燥的均匀性,设计了物料厚度的限制装置,并以玉米颗粒为试验物料,对所设计的射频干燥机进行物料衡算及能耗分析。结果表明,干燥1 000kg玉米颗粒,平均耗时40.83min,平均干燥能耗4 241.438 9kJ/kg·H2O。该机可以较大幅度地提高热能利用率,保障物料干制品质量。 相似文献
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为较好地解决单一红外干燥均匀性差的问题,利用红外加热高效节能的特点,结合喷动床流动性好、传热均匀的特点,设计了红外联合喷动床干燥设备。该装置包括喷动床干燥系统、红外辐射加热系统、回风式空气调节系统、动力循环系统和控制系统等。并以新鲜毛豆为物料,对该装置干燥均匀性和产品品质进行试验验证。结果表明,单一红外干燥耗时270 min,而红外—喷动床联合干燥耗时160 min,与单一的红外干燥相比,红外—喷动床联合干燥时间缩短了40.7%;同时,红外—喷动床联合干燥设备减轻了毛豆仁干瘪皱缩现象,使干制品具有较好的豆香味和感官品质。 相似文献
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德国米葱热泵干燥设备及工艺研究 总被引:1,自引:0,他引:1
利用空气能热泵干燥技术,结合热风干燥香葱失水规律,设计了干燥100 kg德国米葱热泵干燥设备的干燥室系统,并对热泵干燥室进行应用试验。结果表明:热泵干燥系统供热充足,控制系统工作准确,可以满足德国米葱的干燥工艺;比较了干燥室内5处德国米葱的干燥品质,并与燃煤干燥室产品进行比较,热泵干燥德国米葱在色泽、复水性、感官评价及能耗方面均有一定的优势;本次干燥总耗电35 k W·h,单位能耗除湿量为2.64 kg/(k W·h),总费用为17.5元,核算干燥成本为2.3元/kg,能源成本降低了23.3%,对于生产实践具有很好的指导意义。 相似文献