共查询到19条相似文献,搜索用时 109 毫秒
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煤调湿技术不但可以增加焦炉生产能力和焦炭产品质量,还可以减少炼焦时所需的能源,从而起到节能环保的作用。本文对煤调湿这种技术进行了系统的简介,并阐述了煤调湿技术的几种主要工艺,以及每种工艺的优点和缺点,最后又分析了煤调湿技术在炼焦工业中的应用效果。以期该技术能够在今后的发展中得到大力的推广。 相似文献
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针对云煤能源公司下属焦化公司生产中因配煤水分高而造成的煤饼剥蚀量大、易坍塌、捣固成型困难等问题,进行了煤调湿工艺开发,以焦炉烟道气余热为热源或动力源,开发的"焦炉烟道废气-流化床"和"焦炉烟道废气-滚筒干燥机"煤调湿技术,可以控制配煤水分在10%左右,并且在节能、降耗、减排方面效益显著。 相似文献
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煤调湿技术开发及在焦化厂的应用 总被引:1,自引:0,他引:1
中国是世界第一焦炭生产大国,但我国焦化厂炼焦用煤普遍存在含水量偏高(10%左右)的问题。采用煤调湿技术,将焦化厂入炉煤稳定在5%~6%,可降低炼焦耗热量,提高焦炉生产能力,改善焦炭质量,延长焦炉寿命。介绍了煤调湿技术进展及在日本和我国应用的情况,指出煤调湿是我国焦化工业今后重点开发和推广的技术之一。 相似文献
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焦炉装炉煤调湿及其效益 总被引:1,自引:1,他引:1
介绍装炉煤调湿技术的优点及近十年来日本普遍开展焦炉装炉煤调湿技术的试验和生产实践。利用荒煤气及烟道废气或干熄焦发电机背压蒸汽做热载体与湿煤进行热交换,使装炉煤达到预期的含水量。 相似文献
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气泡生成过程中气液传质是气液接触设备的设计、优化的重要参考指标。以二氧化碳气泡在羧甲基纤维素钠(carboxymethyl cellulose,CMC)溶液中生成过程中的传质为研究对象,分别考察了气速、CMC溶液浓度、针头直径对气泡生成过程气液传质的影响,采用具有CCD显微相机的动态接触角分析仪测量了气泡形状、表面积和体积的变化,进而获得气泡生成过程气液传质系数kl。实验结果表明,CMC浓度从0.2%增加到0.8%,黏度逐渐增大,传质系数随CMC浓度的增大而增大;针头直径从2.5 mm增加到4 mm,传质系数也随之增大;气速从1 ml·min-1增加到9 ml·min-1,传质系数也逐渐增大。 相似文献
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The local bubble behavior such as holdup, bubble frequency, bubble size and rising velocity in a bubble column of CMC solution
was measured using the eleclroresislivity probe technique, and the effects of gas velocity and CMC concentration on the behavior
were investigated. Also, the total gas holdup was measured from the liquid level in the column, and its relation with gas
velocity and CMC concentration was studied. Two correlations of mean bubble size and total gas holdup with dimensionless groups,
composed of gas velocity and physical properties of gas and liquid, were obtained from the experimental results. 相似文献
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New experimental data are presented on the coalescence dynamics of twin bubbles at two adjacent nozzles in carboxymethyl cellulose (CMC) solutions. The coalescence process was recorded by using a fast video technique and the images were then analyzed to evaluate the regime, efficiency, and patterns of bubble coalescence. The results reveal that the coalescence process contains the four periods of spherical expansion, rapid mergence, overall growth, and instant departure. The coalescence efficiency always passes through five stages with the gas flow rate; it grows with the CMC solution concentration, but decreases with the surfactant concentration, except at very low gas flow rates. The bubble coalescence pattern strongly depends on the nozzle spacing, but conditionally on the gas flow rate and the solution properties. 相似文献
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Rémy Bois Elisabeth van Hecke Isabelle Pezron Alla Nesterenko 《Journal of surfactants and detergents》2020,23(2):359-369
Foaming properties of five model surfactants, namely, sodium laureth sulfate (SLES), sodium dodecylsulfate (SDS), polyoxyethylene 23 lauryl ether (Brij L23), polysorbate 20 (Tween 20), and polysorbate 80 (Tween 80), have been compared as a function of experimental conditions using the gas-sparging method. The influence of surfactant concentration relative to the critical micelle concentration (CMC) and three process parameters—frit porosity, gas flow rate, and preset volume of foam (or bubbling time)—was studied by means of a 24–1 factorial design. Three foaming properties were considered: foam capacity, foam stability, and maximal foam density. At the CMC, SLES, SDS, Tween 20, and Brij L23 were indistinguishable, all having very high foaming capacity and stability, regardless of process conditions. At 0.1 CMC, differences among them were highlighted especially at the lowest frit porosity coupled to the highest gas flow rate. Those conditions are thus recommended when a rapid screening of surfactant foaming performances is needed. 相似文献
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以拟塑性羧甲基纤维素钠(CMC)水溶液作为非牛顿流体,对在线上升气泡的聚并规律进行了研究。利用光电信号采集系统测定了不同高度的气泡聚并分布规律,分析了气体速度及流体性质等因素对聚并规律的影响。结果表明,在测量高度和实验气速范围内,随着高度升高,在高气速下,气泡聚并率减小,在低气速下,则先增大后减小。2种情况下,达到一定高度后均趋于恒定;在一定高度下,达到一定气速后,气泡聚并率变化较小;中低气速下,聚并率随CMC质量分数增大而减小,而在高气速下,CMC质量分数变化对聚并率影响较小。 相似文献
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以处理量400t/h煤调湿为例,对比了蒸汽热源和焦炉煤气燃烧后废气热源2种煤调湿技术的技术可行性、出口废气露点、能源利用效率和操作安全性,结果表明,以焦炉煤气燃烧后废气或掺入一定比例甲醇驰放气的焦炉煤气燃烧后废气为热源的煤调湿技术是可行的。 相似文献
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很多废水处理装置涉及非牛顿型流体中的多相流动和传质问题,研究其中的气液传质过程有助于实现装置的优化设计和高效节能运行。以鼓泡反应器内清水和不同质量分数的羧甲基纤维素钠(CMC)水溶液为实验对象,分别研究气相表观气速和液相流变特性对气泡尺寸分布、全局气含率和体积氧传质系数的影响。实验结果表明,液相的流变特性对其传质特性参数均有较大影响。与清水相比,CMC水溶液中气泡平均直径和分布范围更大;清水和CMC水溶液的全局气含率均随表观气速的增加而增大;CMC水溶液的体积氧传质系数随CMC水溶液质量分数的增加而减小。基于实验研究,得出修正的体积氧传质系数公式和适用于幂律型非牛顿流体流动体系氧传递过程的无量纲关联式,可很好地实现非牛顿流体流动的废水处理装置中气液传质参数的计算。 相似文献
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To develop a new method for the manufacture of anionic surfactants such as alkanesulfonates, which are completely biodegradable,
we used linear aliphatic hydrocarbons C12 and C14 as raw material. These hydrocarbons were transformed into the corresponding sulfochlorides in quantitative vield by photosulfochlorination
with sulfuryl chloride. The operating conditions led to reaction mixtures containing all the position isomers of sulfochlorinated
and chlorinated alkanes. These compounds have been identified by gas chromatography-mass spectrometry. The isomeric distribution
of different reaction products, as well as the molar ratio of the main product, the alkanesulfochlorides, vs. the by-products,
the alkanechlorides, were determined by the gas chromatogrpahy method. The particular isomeric distribution observed during
these reactions was different from that of classic chain reactions, as highlighted by the values of calculated relative reactivities.
After separation, purification, and alkaline hydrolysis steps, the resulting dodecane and tetradecanesulfonates showed good
surface activity. Indeed, the values of the surface tensions at the critical micelle concentration (CMC) compare well with
those in the literature. CMC values of these mixtures are given, and the influence of isomeric distribution on CMC values
and on the surface tension values at the CMC is presented. 相似文献