共查询到20条相似文献,搜索用时 93 毫秒
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简述环氧树脂反应原理与对反应器设计要求。详细介绍环氧树脂反应器从引进的118m3放大到36m3的设计计算,结果表明其基本符合实际工况要求。 相似文献
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废水处理光催化反应器的发展 总被引:2,自引:0,他引:2
光催化是一项很有前途的水处理技术,光催化反应器是影响光催化反应效率的重要因素之一。作者对影响光催化反应器效率的因素如光源种类、反应器结构、催化剂状态等进行了分析,并总结了近年来在国内外研制及应用的一些典型的光催化反应器.给出了其结构图.并对其优缺点进行了评价。 相似文献
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本文以探讨磷铵管式反应器的工作原理为基础,阐述了以保持通过单位反应器截面的反应量(以反应热的通过量表示)相等,作为放大准则的机理。指出在放大设计时,强化气-液两相间质量、热量、动量传递的重要性。给出了与之匹配的设计参数取值范围;以及在反应器规格设计完成后,必须做好的各项工作。 相似文献
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对目前使用很多的环状非均相光催化反应器的重要设计因素以及关键部件的选取进行了研究。依照得出的结论设计了一套简单实用的环状非均相光催化反应器,并进行了氨氮光催化降解实验以验证装置效果。结果证明,该设计装置降解效率较高,具有一定的推广前景。 相似文献
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光催化技术因其具有较高的催化活性和低廉的价格已经在水处理中被广泛采用,但是粉末催化剂的明显缺点制约了其工业化应用,因此固定化光催化技术应运而生。通过收集国内外资料,对于光催化固定技术应用的两个关键因素——固定方法和适用的反应器的发展进行了介绍。当固定的同时催化剂活性不会大幅下降,且采用适合于该种载体的反应器,固定化光催化技术在水处理领域有着广阔的应用前景。 相似文献
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This paper presents the results of a study on the scale-up, from a batch to a continuous flow unit, of an electrochemical reactor applied for the treatment of textile wastewater. Decolourisation of the wastewater bearing a reactive dye Red Procion H-EXGL proceeded via indirect electro-oxidation, mediated by “active chlorine”. The kinetics of decolourisation in a single-cell reactor under different operating conditions were second order, with the highest apparent rate constant (k = 0.523 l mol−1 s−1) achieved at 40 °C. A low Hatta number (Ha = 0.03) indicated that the reaction occurred totally in the bulk solution, hence homogeneous reaction kinetics were used successively to scale-up a continuous flow electrochemical unit: a once-through filter-press reactor. Its hydrodynamic characteristics were defined by the residence time distribution (E(t)) function using a pulse injection method. The decolourisation efficiency experimentally determined in a continuous flow reactor was further compared with that predicted on the basis of the knowledge of the E(t) of the reactor and the homogeneous phase kinetic expression, obtained from the batch study and corrected for the geometric parameters of the reactors. A complete segregation of the fluid inside the flow reactor was assumed. For different applied flow rates, the experimentally defined conversion of the dye was close to the calculated value. 相似文献
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通过改进清洗方式,进行电镀工艺改革,降低电镀废水量和有毒物质浓度。对电镀废水处理站的总体设计依据及其内容进行了详细描述。 相似文献
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采用循环式浆态光催化反应器对苯甲酰胺模拟废水光催化氧化特性和动力学进行了研究,系统地考察了操作条件对模拟污染物光催化降解的影响,并与搅拌式和鼓泡床式浆态光催化反应器中苯甲酰胺的降解效果进行对比.结果表明,循环式浆态光催化反应器中光催化剂的用量、污染物的初始浓度和初始pH值对模拟污染物光催化降解性能的影响存在适宜值;体系中H2PO-4、Cl-、Cu2+、Al3+对其光催化降解过程有明显的抑制作用.与传统的搅拌式和鼓泡床式浆态光催化反应器相比,循环式浆态光催化反应器中催化剂和废水的混合效果较好,光利用率高,较大程度上减少催化剂的用量和提高废水处理能力.同时,对不同催化剂的用量和污染物初始浓度下的光催化氧化反应动力学研究表明,此过程符合拟一级动力学,催化剂表面反应速率常数k0和催化剂吸附平衡常数KTiO2分别为0.0279 min-1和17.99 L8226;g-1. 相似文献
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CPR1000核电机组在运行过程中将会产生不同类型的非放射性污废水。介绍了CPR1000核电厂内非放射性污废水的来源、水质特征类型,以及排水系统的设置和非放射性污废水处理方法。建议生活污水采用CASS或MBR处理工艺;非放射性含油废水采用萃取法或吸附法的处理工艺。 相似文献
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综述了国内外厌氧折流板反应器(ABR)应用于废水处理的研究进展,从ABR的启动和进水方式、出水循环和增设填料、处理低浓度和高浓度废水等方面分析了ABR的特点和优缺点,并在此基础上提出了今后ABR的研究发展方向。 相似文献
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John D. Sheppard Philippe Marchessault Thomas Whalen Suzelle F. Barrington 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1994,59(1):83-89
The operation of a cyclone bioreactor differs from conventional stirred tanks since the agitation is accomplished by means of a pumped reciculation loop. Oxygen transfer can occur across the swirling gas—liquid interface in the cyclone or from bubbles entrained in the recirculation loop. A cyclone bioreactor was scaled-up from a 1 dm3 bench top unit to a 75 dm3 Process Development Unit (PDU). A reduction in the aspect ratio was compensated for by extending the length of the recirculation loop and providing additional aeration. Performance of the two reactors for the production of microbial poly-β-hydroxybutyrate (PHB) was compared under various operation conditions. The culture used for PHB production was Alcaligenes eutrophus DSM 545, grown on a mineral salts medium limited by the supply of nitrogen. The levels of dissolved oxygen obtained in the PDU were strongly dependent on the location at which the air was introduced into the reactor. However, with aeration balanced between two injection points and a similar level of power input, 17 J s?1 dm?3, the PDU was able to provide at least as much oxygen transfer capability as the laboratory-scale reactor. Under all conditions tested, the PHB accumulation by A. eutrophus was in excess of 80% of the biomass dry weight, although the yield on glucose was lower in the PDU than in the laboratory-scale reactor. 相似文献