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为了控制稻谷储藏期间品质的变化,针对稻谷的储藏不稳定性,对高大平房仓散存稻谷进行了稻壳压盖密闭控温技术与常规储藏技术试验对照。通过定层、定点、定时对粮温、品质等数据进行检测和分析,在粮面采取稻壳压盖控温的条件下,能有效控制稻谷表层粮温的上升,隔热保冷效果明显,延缓了稻谷品质变化的速度,实现了稻谷的安全度夏储藏。 相似文献
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针对春夏季粮温上升,导致粮食品质下降、虫霉危害增加的问题,利用杭嘉湖地区丰富的地下水资源和高效换热器技术,研发地下水风机盘管机组控制仓温工艺技术。实仓试验结果表明,该技术能够有效地控制仓内空间空气温度,最高仓温低于26℃,粮堆上层最高粮温低于25℃,同时延缓各层粮温的上升,并将整仓平均粮温控制在18.3℃以内。对照仓最高仓温约为36℃,粮堆上层最高粮温从第四周开始高于25℃,最高达到28.7℃,同时各层粮温的上升速度较快,整仓平均粮温达到21.0℃。使用该技术11周,吨粮电耗成本为1.175元。因此,应用该技术在试验仓实现了准低温储粮,在保证储粮安全方面发挥了重要的作用。 相似文献
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采用聚氨酯发泡喷涂技术对钢板仓外表面进行保温隔热处理,之后再喷涂白色乳胶漆作为聚氨酯硬泡体的保护反光层,这种保温技术有效地控制了外温变化对钢板仓的仓温、粮温的影响,延缓仓内粮食品质劣变,保温隔热效果显著,有利于钢板仓储粮保管和储粮安全,促进低温储粮发展。 相似文献
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针对当前农户储粮钢板仓存在的问题,重点研究了造成钢板仓漏气的部位——各层接缝处、出粮口的气密防潮方式和结构,提出了加装层沿密封条、层间加装紧固扣件、仓圈边缘加工成螺纹状、密封出粮口设计、加装整体密封罩等多个经济、方便、实用的气密防潮性改造设计方案.并通过气密防潮仓与对照实验表明,增加层沿密封条和采用密封出粮口后,气密防潮仓内粮食的含水量变化明显较对照仓缓慢,仓房防潮性能明显提高.在人为改变环境温度后,对照仓内的上层粮温明显高于气密防潮仓内的粮温,气密防潮仓的隔热性能也得到了提高. 相似文献
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几种粮仓隔热材料隔热效果比较 总被引:2,自引:2,他引:2
利用聚氨酯、膨胀珍珠岩、挤塑式聚乙烯保温板(PEF)、稻壳等隔热材料分别对仓顶、仓拱板上弦及粮面等部位进行控温效果试验。结果表明仓拱内采用10cm珍珠岩 50cm水泥珍珠岩隔热,效果最好,具有经济、有效的特点,最高可降低仓温10℃,降低粮温3~4℃,延缓了粮食陈化。仓顶采用20cm厚水泥珍珠岩隔热,最高可降低仓温8℃;仓拱内采用3cm聚氨酯隔热,最多可降低仓温6℃。粮面采用2cm厚PEF材料隔热,板上板下最高温差7℃;采用15cm厚稻壳覆盖粮面隔热,在一定时间内能够延缓粮温上升。 相似文献
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Mo Yusong Ding Mingliang Xu Jinhui 《保鲜与加工》1989,(6):1-6
In this paper we explain the method of the measurement of the wormwheel profile error with the three coordinate measuring machine. We first establish the wormwheel theoritical tooth profile equation according to the gear engage principle, then write the computing program and calculate the wormwheel theoritical profile, next analyse and calculate the error of the gage head interference. At last, we work out the measuring program and get the wormwheel profile measured with the three-coordinate measuring machine. 相似文献
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Wu Zhiqiang Zeng Xiangren 《保鲜与加工》1992,(4):73-79
This paper analyses the additional stray losses of transformer winding caused by harmonics,and suggests that the influence of harmonics should be taken into consideration in the selection of the conductor' s size in rectifier transformer and converter transformer design. 相似文献
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THE STRAIN OF THE BARS IN THE STRUCTURAL COLUMNS OF THE PRESTRESSED EARTHQUAKE-RESISTANT BRICK-WALLS
Luo Wankang 《保鲜与加工》1995,(1)
Through the comparative tests of prestressed and non-prestressed brick-walls un-der the repeated lateral loading,the effect of the prestress-force to the strain distribution in the non-prestressed bars of the structural columns has been investigated.This effect is beneficial:the pre-stress-force will reduce the value of strain in the bars of the lower part in the columns and uniformize the strain distribution along the whole height of the columns.Furthermore,instead of a strainreduction,the strain of prestressed be will increase along with the increasing of the lateral load.Thus,the coefficient of prestress-force-increase could be calculated in the tWo stages of the crack-resistance and ultimate bearing capacity.As a result,both the prestressed and non-prestressed barsare able to give the potential of their bearing capacity a full play,and improve the earthquake-resis-tant property. 相似文献
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Qiou Xiande Zhuang Qiancheng Wu Gang Xiao Changfu 《保鲜与加工》1992,(3):134-140
The problems that the bump of coal and methame in the mine is contraled by the
stress of longwall and that the coal and methane bump in the mine is affected by the physical properties of the coal are analysed and discussed through some specific bump cases. It is shown that the compressive stress, the content of the methane of the coal, and the bump of coal and methane are directly affected by the content of the ash and the volatile of the coal. 相似文献
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采用粮堆局部处理机解决了高大平房仓大粮堆局部生虫的问题,对处理区内粮温,水分无大的影响,人工、耗电量、药剂用量大大降低。该机可用于熏蒸、整仓通风和新仓干燥。 相似文献
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Liu Chengquan Song Qinan Li Yun Wen Liangying 《保鲜与加工》1992,(1):42-47
The computation principle for the pipe-casing gun of the equal acress-section area is studied by applying the basic theory of compressible. The aerodynamic parameter of the pipecasing gun and the friction factor of rustless sted-pipes and copper-pipes of different diameters are measured. On the basis of this measurement, the outlet-velcity profile and the change of the rate and pressure on the axis are measured. The results show that the friction factor measured is reliable and the computation method is practical. 相似文献
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在实验室条件下进行了两种挂面的储藏实验.在储藏过程中分析了挂面的水分,脂肪酸值和烹煮特性的变化.实验结果表明,挂面的水分随空气中的湿度而变化,脂肪酸值随储藏时间而增加,增加到一定程度又开始下降.在挂面烹煮特性方面,挂面的吸水率在储藏期间开始呈增加的趋势,然后变化较平缓,最后开始下降.面汤中直链淀粉含量随储藏时间迅速减少.挂面的烹煮损失呈下降趋势. 相似文献