密炼机上辅机系统的发展方向

对密炼机上辅机系统的改进作了详细的分析,从炼胶工艺优化、缩短炼胶时间、提高炼胶质量、节能、环保排放、防爆安全等方面详细介绍了提高和改进密炼机上辅机系统性能的具体改进方案和要点。最后简介了智能化和大规格密炼机上辅机的特点。     

XHM2140/20密炼机终炼工艺条件的改进

对ＺＨＭ－１４０／２０密炼机终炼工艺进行改进：在密炼机中加硫黄／促进剂和粘合剂Ａ,通过时间控制排胶温主。试验结果表明,采用取这些措施不仅缩短混炼时间,提高瀑炼效率,改善工作环境和降低劳动强度,而且还可改善硫黄和粘合剂Ａ的分散,缩短粘合剂Ａ混入时间,改善混炼胶质量。     

XHM-140/20密炼机终炼工艺条件的改进

对ＸＨＭ１４０／２０密炼机终炼工艺条件进行改进：在密炼机中加硫黄／促进剂和粘合剂Ａ,通过时间控制排胶温度。试验结果表明,采取这些措施不仅缩短混炼时间,提高混炼效率,改善工作环境和降低劳动强度,而且还可改善硫黄和粘合剂Ａ的分散,缩短粘合剂Ａ混入时间,改善混炼胶质量     

苎麻快速脱胶剂的研制

将表面活性剂和无机助剂复配应用于苎麻脱胶。通过测定苎麻脱胶后的残胶率，用正交试验法优选了脱胶剂最佳配方，制备的脱胶剂将原脱胶工艺的2次煮炼改进为1次煮炼，煮炼时间由5.0h-6.0h缩短为2.0h-3.0h。按照国标测定，制备的脱胶剂优于瑞士进口助剂及原工艺脱胶效果。     

轮胎胎面挤出质量的控制

分析轮胎胎面挤出质量波动的原因，并提出相应解决措施。原材料性能波动、终炼胶性能不稳定、挤出胎面尺寸波动、终炼胶停放时间差异、操作差异性、挤出胎面质量监控办法不科学和工艺与工装不匹配是造成胎面质量波动的主要原因，通过采取改进原材料采购形式、严格控制终炼胶性能、提高挤出部件尺寸控制精度、控制终炼胶停放时间、消除操作差异性、采用挤出部件质量自动筛选系统以及确保工艺与工装匹配等措施，稳定了胎面质量，使成品轮胎合格率大幅提高。     

密炼机上压砣控制系统的改进效果

以全钢子午线轮胎带束层胶的混炼为例,探讨GK255型密炼机上压砣控制系统的改进效果。结果表明：上压砣由气压控制系统改为液压控制系统后,炼胶压力稳定,胶料门尼粘度减小,胶料密度均匀性和炭黑分散等级相当,成品轮胎耐久性能均有所提高;省去胶料三段混炼工序,可缩短混炼时间,提高生产效率,节约生产成本。     

低温一次法炼胶工艺的研究开发和应用进展

简述国外新型连续混炼工艺,重点总结和介绍国内低温一次法炼胶工艺的研究开发和应用进展。低温一次法炼胶工艺是将传统的多段混炼改为一次混炼,即胶料通过密炼机高温密炼后,先经过第一台开炼机进行冷却,然后通过中央输送系统对称地分配到周围多台开炼机进行连续低温混炼,直接得到终炼胶,整个过程强化了下辅机的混炼作用,且全过程实现自动化控制,取消了胶料中间传递和反复升降温过程,从而大幅度减少占用场地,降低能耗,缩短混炼时间。橡胶混炼技术未来的发展方向是利用物联网设计理念和可视化监控方式、高度集成成套智能装备的智能化炼胶车间总体设计。     

X(S)M系列加压式橡胶(塑料)密炼机的特点

X(S)M系列加压式密炼机具有以下特点:省电节能;向前翻转式自动卸料,结构紧凑,占地面积可减少30％左右;质量减轻了39％;因提高了炼胶时的工作压力而缩短了炼胶时间,可提高生产效率20％;有防     

改进炼胶工艺提高翻新轮胎胎面胶质量

近年来,我国很多翻新轮胎厂对炼胶设备和工艺进行了改进,但多偏重提高生产效率,而对改进炼胶工艺重视不够。本工作以提高翻新轮胎胎面胶质量为目的,探讨优化炼胶工艺。     

优化密炼机上辅机系统 提高密炼机炼胶效率

探讨气力输送过程中各工艺辅助时间及成本和炭黑粒子破碎对密炼机炼胶效率的影响.通过采用相应输送管材和相应技术措施防止结垢,并优化工艺缩短炭黑投料和注油等辅助过程时间后,可大大提高密炼机混炼效率.针对密炼机投料过程中易产生堵塞的问题,采用圆形偏心料斗和软斜槽及管夹阀后,可大大减少堵塞,提高炼胶效率.     

用统计方法分析密炼机混炼过程瞬时功率对混炼胶可塑性的影响

为比较密炼机混炼过程的时间、能量消耗、瞬时功率对混炼胶可塑性的影响，采用统计方法分析，发现瞬时功率与胶料可塑性相关系数大，影响最显著。即在密炼机混炼工艺过程中，采用瞬时功率为控制参数最好。     

Peppermint Drying Performance of Contact Dryer in Terms of Product Quality,Energy Consumption,and Drying Duration

Drying is a commonly used postharvest operation for medicinal and aromatic plants. Their high initial moisture contents, requirement of moderate drying temperatures, and quick deterioration of their quality attributes make their drying processes energy intensive and time consuming. These properties may also cause the dried product to be of heterogeneous quality. A contact dryer that transferred energy to drying plants mainly by heat conduction was developed and tested by mixing or not mixing batches of 15 kg of chopped peppermint plants. The contact dryer had three main operational units: a drying table, a mobile mixing/aeration car, and a control panel. The contact dryer was operated with one of four drying programs. All programs affected the completion duration of drying, essential oil content, and dried product color differently. The shortest drying time (15 h) was obtained using the drying program of gradually increased water temperature from 55–60 to 75–80°C in 6 h and mixing/aeration. However, mixing and aeration changed the product color slightly more and partially increased essential oil loss. These drawbacks can be alleviated by selecting the appropriate duration of mixing and aeration. The menthol and menthone percentages of fresh peppermint essential oil ranged from 31.02 to 34.02% (average value: 32.52%) and 23.23 to 26.47% (average value: 24.85%), respectively. The menthol and menthone percentages of dried peppermint essential oil ranged from 22.74 to 42.07% and from 8.95 to 21.76%, respectively. The significant variations in the essential oil composition of dried peppermint leaves within replications were possibly caused by the variations associated with the age and cutting order of fresh peppermint plants at harvest.     

Determination of the energy consumption during the production of various concrete recipes

This article presents a report of the mixing of concrete on the laboratory scale in a single-shaft and twin-shaft mixer. For both mixers we selected five concrete recipes that cover a broad spectrum of concrete mixing techniques. The concrete recipes differ from each other amongst other things by virtue of the aggregate-sized distribution curves, water-cement ratio, flow properties, compressive strength and mixing times. The specifically volume-related application of energy - which is necessary for the homogenization of the particular recipe in the mixer - is an essential influencing variable.The comparison of the specifically volume-related application of energy is possible only if the concrete recipes possess the same homogeneity. The time curve of the homogeneity plotted against the necessary mixing time indicates the mixing efficiency, which in turn is determined by an imaging measurement process. Comprehensive mixing experiments show that the resulting application of energy, measured via the current composition, does not provide sufficient information in order to define the actual homogeneity in the mixture. A method was developed for the purpose of comparing concrete mixtures based on various recipes with the same homogeneity in relation to the specifically volume-related application of energy. The particular application of energy can be determined via the required mixing time and the power output process in terms of time.     

旋转式能量回收装置混合过程优化研究

旋转式能量回收装置（RERD）是反渗透海水淡化系统中的关键设备之一,对降低系统运行成本起到重要作用。本研究采用流体力学软件FLUENT,建立RERD装置三维非稳态滑移网格模型,研究分析了转速和流速对装置盐度场分布、混合度和效率的影响规律,获得了可实现装置混合度≤4%和能量回收效率≥98%运行效果的适宜操作条件,模拟结果对RERD实用化开发具有理论指导意义。     

Experimental study of mixing performances using steady and unsteady jets

This paper deals with the experimental study of mixing characteristics by means of steady and unsteady jets. Investigations were carried out with one and two steady jets, and with two alternate intermittent jets, supplying 0.1 m³ and 70 m³ tanks. From the data obtained from several sensors put into the tank, the signification of the mixing time as applied to the tank is discussed. A Reech-Froude similarity appears to be a good way in scaling the results obtained on either 0.1 m³ or 70 m³ models. Combining the specific momentum of the jets and the tank characteristics, a mixing time factor M is deduced which permits the evaluation of the mixing time. The efficiency of different configurations of jets are then compared through a degree of transient inhomogeneity and required power.     

Single and two-phase flows in a horizontal pipe with a Kenics static mixer: Effect of pressure drop on mixing

Single and two-phase flows pressure drops through a Kenics static mixer were investigated, for liquid and gas Reynolds numbers ranging from 8110 < Re_L < 18 940 to 1730 < Re_G < 8680, respectively. New friction factor correlations were established for single and two-phase flows, showing better agreement than those available in the literature. Dissipated energy and characteristic time constants were estimated from experimental data. For instance, a dissipated energy with a maximum value of 510 W/kg was calculated in two-phase flow with the drift-flux model. The dispersed phase reduced the characteristic mixing times and its influence was more important than the continuous phase for all the characteristic mixing time investigated. Furthermore, the macroscopic characteristic mixing time was shown to be the governing mixing process for almost all gas and liquid flow rates explored.     

浅析燃煤蒸汽锅炉喷燃器节能技术改造

动力锅炉经常处于煤、气混烧运行状态。煤粉燃烧器在长期掺烧高热值炼厂干气后,煤粉燃烧恶化,燃烧效率降低,锅炉运行工况调节困难,甚至使燃烧器严重损坏,严重危及锅炉的正常安全稳定运行。本文针对锅炉燃烧器实际运行中存在的问题进行了深入的分析,提出了1套切实可行的改造方案,并详细介绍了喷燃器的改造方案及实施情况。改造后较好地解决了锅炉结焦问题,提高了锅炉运行负荷,避免了锅炉掉焦灭火,延长了锅炉连续运行周期。     

基于能量等效的双转子连续混炼机混炼段相似放大研究探讨

根据双转子连续混炼机自身特性和等效平均停留时间、等价转子顶部剪切速率的原则,以能量等效为衡量混合效果的准则,提出双转子连续混炼机混炼段相似放大设计的流程及其理论模型。在该模型确定的转子转速和喂料速率下,利用Polyflow软件模拟了机筒内径分别为30 mm和100 mm的双转子连续混炼机混炼段和卸料段内的流场特征,以能量等效为指导准则,通过对流场特征和混合效果进行分析,对所提出的相似放大设计理论模型进行了验证。     

密炼机密炼辅助时间减少措施浅析

介绍了密炼配方时间减少的措施,通过密炼控制工艺的调整,在不增加硬件改造费用,不调整工艺配方的前提下,缩短密炼辅助时间,提高胶料产量,提高密炼机的利用效率.