共查询到20条相似文献,搜索用时 125 毫秒
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浅析控制水泥生料饱和比刘玉宏山东省龙口市诸由水泥股份有限公司(265705)近年来,水泥行业发展迅速,竞争激烈。市场对水泥质量要求越来越高,各厂都把重点放在如何提高熟料质量上。为了达到这一目的,搞好原材料的均化,稳定生料质量是获得优质熟料的前提条件,... 相似文献
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测定水泥比表面积时不可忽视的一个因素刘广华中国水泥质量监督检验中心(100024)水泥细度是水泥质量的重要指标之一,而透气法比表面积是水泥细度表示方法的一种。透气法比表面积的测定原理是根据一定量的空气,在一定压力下,通过一定空隙率和固定厚度的水泥层所... 相似文献
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本文就1992年发放未知样品对炭黑企业质部门的实际检验能力和检验质量进行考核的情况进行了总结,对收回的检验数据,检验结果的准确性及检验报告单进行了评述,并对加强质检机构的建设和管理提出了建议。 相似文献
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通过对次钠液用量、尿素液质量、肼液质量、尿素得率等大量测试,探讨氟尿比对肼产量和质量的影响。重点从反应动力学角度按反应速度方程讨论在105℃、95℃、77℃、68℃、等温度下主副反应速率以及氯尿比与肼的质量及浓度、有效氯得率和尿素得率的关系。其结论是氯尿比与次钠用量、肼液用量呈线性关系;不同反应温度下,氯尿比对肼的质量、浓度;尿素得率的影响程度不同;随着反应温度上升,最佳氟尿比也上升。 相似文献
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用稻壳生产沉淀白炭黑存在白炭黑产品比表面积高,分散性差等问题,质量难以提高,曾有报道用稻壳灰生产白炭黑,均因质量成本问题而不能生存,本文介绍了采用硫酸法生产沉淀自炭黑的工艺,调整工艺后的产品比表面积明显降低。分散性明显改善,产品质量明显提高。 相似文献
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The drying of paddy rice may result in quality degradation, expressed as a head kernel yield, leading to significant commercial depreciation of the product. A mathematical model of the drying and of the quality degradation process was combined with a dynamic optimization algorithm to determine the drying conditions (air temperature and relative humidity as functions of time) that ensured the highest possible final product quality for a specified drying time and a specified final moisture content. The robustness of the optimal drying strategy with respect to the initial state of the product, to the model parameters and to the initialization of the optimization algorithm was verified. The compromise between the highest achievable final quality and the allowed total drying time was studied. The combination of simulation and optimization yielded a new insight in the rice drying process and in the quality preservation strategies. 相似文献
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Sundaram Gunasekaran 《Drying Technology》2013,31(3):395-412
ABSTRACT Microwave drying of food materials has been investigated over several years as a potential means for reducing the total drying time. However, some quality loss almost always accompanied when foods were dried completely using microwaves due to nonuniform temperature and moisture distribution. Some strategies used to improve dried product quality include combination of microwave and conventional hot air drying. pulsed or intermittent drying, and microwave-vacuum drying. Combination of pulsing and vacuum drying is a useful technique to maximize energy use efficiency and product quality especially for temperature sensitive products such as fruits. Some results of pulsed, microwave-vacuum drying of cranberries are presented. Pulsed drying is more energy efficient than continuous drying. In pulsed drying, the longer the pulsing ratio (i.e. longer power-off time in relation to power-on time) was more energy efficient. The quality of pulse-dried product was also generally better than that of continuous-dried product. The cycle power-on time and pulsing ratio should be carefully selected to obtain maximize the benefits of pulsed, microwave vacuum drying 相似文献
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PULSED MICROWAVE-VACUUM DRYING OF FOOD MATERIALS 总被引:4,自引:0,他引:4
Sundaram Gunasekaran 《Drying Technology》1999,17(3):395-412
Microwave drying of food materials has been investigated over several years as a potential means for reducing the total drying time. However, some quality loss almost always accompanied when foods were dried completely using microwaves due to nonuniform temperature and moisture distribution. Some strategies used to improve dried product quality include combination of microwave and conventional hot air drying. pulsed or intermittent drying, and microwave-vacuum drying. Combination of pulsing and vacuum drying is a useful technique to maximize energy use efficiency and product quality especially for temperature sensitive products such as fruits. Some results of pulsed, microwave-vacuum drying of cranberries are presented. Pulsed drying is more energy efficient than continuous drying. In pulsed drying, the longer the pulsing ratio (i.e. longer power-off time in relation to power-on time) was more energy efficient. The quality of pulse-dried product was also generally better than that of continuous-dried product. The cycle power-on time and pulsing ratio should be carefully selected to obtain maximize the benefits of pulsed, microwave vacuum drying 相似文献
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直链烷烃氯磺酰化反应的光催化动力学研究 总被引:3,自引:1,他引:3
本系统采用氯气和二氧化硫作为气相原料,C18-17直链烷烃为液相原料,在光作用下进行气相氯磺酰化反应。由于该反应过程机理复杂,本研究采秀工程研究方法,对过程进行合理简化,导得该反应的动力学速率模型,并采用非线性多响应常微分模型的参数估计方法求得模型参数。模型计算值与实验结果能较好吻合,该模型可用于反应器的设计计算。 相似文献
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薄壁塑料件注塑模具设计 总被引:1,自引:0,他引:1
分析薄壁塑料件的设计过程,重点阐述根据模具结构、塑料件成型工艺、塑料件表面质量等来选择进胶方式和位置.通过优化塑料件壁厚和模具结构,实现生产可靠、尺寸稳定,质量满足要求,并总结此类塑料件的模具设计要点. 相似文献
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4,6—二甲氧基—2—甲硫基嘧啶的合成工艺改进 总被引:4,自引:0,他引:4
以丙二酸二乙酯,硫脲为原料,经缩合,甲基化,氯化,甲氧基化制得4,6-二甲氧基-2-甲硫嘧啶,并通过优化操作过程,改变反应温度,使总收率达到61%,而且产品质量提高,纯度达到99%以上。 相似文献
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SIPM的合成及精制 总被引:5,自引:0,他引:5
提供了以60% 发烟硫酸为磺化剂制备5-磺酸钠间苯二甲酸二甲酯(SIPM )的工艺技术。后处理采用二次重结晶的工艺,产品质量好,产品损失少。 相似文献