过热蒸汽在制气中的使用

我厂造气工序原设计使用7.8×10~5Pa饱和蒸汽经减压后与煤气炉系统夹套副产蒸汽混合入炉制气。1986年改用7.8×10~5Pa过热蒸汽和炉系统夹套副产蒸汽混合入炉制气,生产工况和经济效益有了明显的改善和提高。     

过热蒸汽对烧碱蒸发的危害及对策

概述了过热蒸汽对烧碱蒸发的危害,和采取特殊方式的增湿减温措施取得的良好效果：汽耗由5.1t/t降到3.8t/t,节汽约1万t/a,节约资金50万元/a,产量得到很大提高,使烧碱的运行状态得到改善。但仍存在一定问题尚需改进。     

热电厂集中供热——过热蒸汽在轮胎工业中的应用

阐述了热电厂集中供热提供过热蒸汽在轮胎工业中的应用,根据轮胎双模定型硫化机的硫化工艺要求,实际采用内温和外温的供汽参数和供汽方案,以及过热蒸汽减温、减压装置控制原理。     

降温减压器在常压炉过热蒸汽线的应用

介绍了降温减压器的工作原理及其在庆阳石化公司常压炉过热蒸汽线改造中的应用效果。     

过热蒸汽携湿在褐煤干燥中的应用

通过调整过热蒸汽温度与流量,得到了理想的褐煤产品,并确定了最佳的携湿参数,为褐煤干燥携湿技术提供了理论依据。     

过热蒸汽流化床干燥装置

结合过热蒸汽干燥和流化床干燥的各自特性，开发出一种新型的过热蒸汽流化床干燥装置，阐述了工作原理。以卧式多室过热蒸汽流化床干燥装置干燥酒糟为例进行了工艺设计和计算，在保证稳定工作的条件下，干燥室内的绝对压力为0．3MPa，干燥室进出口的工作介质温度分别为180℃和140℃，最佳操作流化速度为2．6m／s。试验结果表明：该卧式多室过热蒸汽流化床干燥装置具有干燥速率大、热效率高、被干产品质量好和干燥操作成本低等优点，特别适宜于初始湿分高而加工附加值低的农产物料的干燥。     

高压过热蒸汽流量测量分析

高压过热蒸汽流量测量分析商凤羽闵修俐（锦西天然气化工有限责任公司,辽宁葫芦岛,１２５００１）１３０万ｔ／ａ合成氨装置高压蒸汽流量检测收稿日期：１９９８－０２－１７。１．１高压蒸汽管网简介合成氨装置的高压蒸汽来自转化段汽包Ｖ－７和合成段汽包Ｖ－２１,两...     

导热油取代过热蒸汽减压蒸馏松香生产工艺

介绍以有机载热体取代过热蒸汽加热的松香减压蒸馏生产工艺。该蒸馏工艺具有节能,安全,方便,易控等优点。     

蒸汽过热炉在高负荷运行中的瓶颈因素及分析

针对苯乙烯装置脱氢系统的实际生产现况,详细分析现阶段蒸汽过热炉(H3001)生产过程中的瓶颈因素,通过工艺、设备的设计参数与实际生产运行参数相结合做出对应的解决方案,日常的精细化操作,对H3001的每个参数变化、趋势变化要敏感对待,实时监控提前做出及时预判,最大限度保证蒸汽过热炉(H3001)的长周期稳定运行,对运行期...     

采取有效措施,降低烧碱蒸汽消耗

分析了近几年来我公司蒸发汽耗高的原因,并提出了相应对策。通过对隔膜蒸发 进行工艺设备改造,使蒸发的蒸汽消耗明显降低。     

Drying paper by impinging jets of superheated steam. Part 1: Constant drying rate in superheated steam

Over a wide range of operating conditions, the drying of paper by impinging jets of superheated steam proceeds by a constant rate period followed by a falling rate period. The constant drying rate, investigated here in the jet temperature range 150 ≤ T_j/ ≤ 465°C and over jet Reynolds numbers of 1000 ≤ Re_j ≤ 12000, is predicted within + 12% by a heat transfer expression using Martin's (1977) correlation for the heat transfer coefficient corrected for mass transfer by the Couette flow approximation factor, and a property ratio to account for the large temperature difference between the jet and the paper.     

过热蒸汽袋式除尘器阻力特性研究

过热蒸汽与高温、高湿烟气具有相似的特性,针对高温、高湿烟气袋除尘困难的问题,设计开发了过热蒸汽袋式除尘器,并试验分析了气体参数对其阻力的影响.结果表明,过热蒸汽袋式除尘器运行状况良好,除尘器阻力随进口气体温度的升高及蒸汽通入时间的延长呈"鱼钩曲线"变化;而蒸汽过热度增加,除尘器阻力减小.     

Convective drying of wood-waste in air and superheated steam

The convective batch drying of Western Hemlock hog fuel-sized particles in fixed beds under various operating conditions quantiatively established the effect of factors which govern the drying process. A correlation was obtained for the Nusselt number during the heat transfer controlled period. Under specific conditions, the existence of a unified characteristic drying rate curve was confirmed. Drying behaviour as described by the receding plane model provided a mathematical expression for such a curve. The existence of an inversion point temperature was experimentally confirmed.     

油页岩过热蒸汽的干燥动力学

以油页岩颗粒作为干燥物料,以过热蒸汽和热空气分别作为干燥介质,进行了油页岩干燥实验的研究。当颗粒粒径减小时,油页岩干燥速率越大;过热蒸汽和热空气温度增大时,干燥速率也越大。对比相同条件下过热蒸汽和热空气干燥油页岩的平均干燥速率,发现当干燥介质温度超过逆转点温度时,过热蒸汽条件下的平均干燥速率大于热空气下的数值。实验得出粒径分别为9,7,5 mm的油页岩颗粒逆转点温度值分别是154,179,177℃;逆转点温度值是个变量,随颗粒粒径大小变化而变化。颗粒粒径越大时逆转点温度值越小,粒径较小时逆转点变化不大。采用薄层干燥模型对油页岩的干燥数据进行动力学模拟,可得修正Page模型(Ⅱ)干基水分比w模拟值与实验值的最大绝对偏差是12%,综合比较发现修正Page模型(Ⅱ)能较好地描述油页岩在过热蒸汽条件下的干燥过程。     

过热蒸汽对氧化铝蒸发传热效率的影响及解决方案

在氧化铝的生产过程中,需要保持系统的水平衡和盐平衡,一般采用多效真空蒸发的生产工艺,换热设备大都采用列管式换热器,Ⅰ效多采用0.6 MPa的新蒸汽作为热源.由于铝酸钠溶液成分十分复杂,含有碳酸盐、硫酸盐等多种杂质,在蒸发过程中会以盐类结晶形式析出而附着在换热管壁上形成结疤,进而影响蒸发器的效率和运转率.作为热源的新蒸汽是由热力锅炉提供,由于输送路程较长,多采用过饱和蒸汽(其温度远远高于饱和蒸汽温度),这样虽然提高了蒸汽输送效率,但是却加剧了蒸发器结疤的形成.通过系统分析认为:用饱和蒸汽替代过饱和蒸汽作为蒸发器热源,可以有效地提高传热效率和蒸发强度,显著地降低能耗.     

Evaluation of the energy efficiency of combined drying and heat treatment by superheated steam

This study compares energy efficiency of a combined drying and heat treatment with that of conventional hot air heat treatment, the theoretical heat consumptions required for each treatment were determined, and the actual heat consumptions for each treatment were measured at a pilot scale. Conventional heat treatment method separately performs kiln-drying and heat treatment for wood with hot air in different equipment. On the contrary, in the combined treatment, the wood is simultaneously dried and heat-treated in the same enclosed space. Because of the time and energy savings, the economic feasibility of combined treatment is much higher than that of conventional heat treatment. Although the theoretical required energy of the combined treatment was similar to that of the two-stage method, the actual energy consumption of combined treatment was less than that of the two-stage method. And, the energy efficiency of the combined treatment was calculated to be two times higher than that of the two-stage method. From the results of this study, decreases in the processing time and energy consumption and increases in the energy efficiency of the combined treatment by superheated steam were quantitatively shown when compared to two-stage method.     

过热蒸汽间歇干燥酒精糟研究

以高湿物料酒精糟为研究对象,进行了过热蒸汽间歇干燥实验研究。利用自行设计的间歇干燥实验台,酒精糟的初始含水质量分数为66.7%,研究了不同实验条件对干燥速率的影响。结果表明:随着干燥介质温度的升高,干燥速率明显加快;被烘物料质量越少,烘干时间越短;随着物料颗粒直径的减小,恒速段的干燥速率基本不变,而降速段的干燥速率明显增加;过热蒸汽质量流量越大,干燥速率越高。因此随着蒸汽过热度的升高、质量流量的增大,过热蒸汽干燥速率加快,干燥效率越高;随着进料质量的增加、颗粒直径的增大,过热蒸汽干燥速率却有所降低。     

过热蒸汽流化床制备粒状磷酸一铵的实验研究

实验研究了过热蒸汽流化床反应干燥一步法制备粒状MAP的工艺条件,在70 kPa,100～130℃,进料n(NH3)/n(H3PO4)为1.2～1.6条件下,床层操作稳定,制得了性状良好的球形磷酸一铵产品。