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《煤炭转化》2015,(3)
利用陕北地区的兰炭末制备水炭浆,研究了兰炭末的粒度配比、制浆搅拌作用及温度对水炭浆表观黏度、流动性和稳定性的影响.兰炭末用实验室球磨机研磨好并筛合成830目(D1),200目~320目(D2),100目~200目(D3)和60目~100目(D4)四种粒径范围.结果表明,当兰炭末的粒度配比m(D1)∶m(D2)∶m(D3)∶m(D4)为5∶2∶2∶1,搅拌速率为1 500r/min,搅拌时间为15min,环境温度为30℃~40℃时,制备出的水炭浆质量分数可达到60%,表观黏度360mPa·s,浆体可以保持一个月内稳定并且流动性良好.随着细粒度兰炭颗粒加入量的增加,水炭浆表观黏度增大,流动性变差,稳定性增强.搅拌速率过高和搅拌时间过长会导致浆体老化,流动性变差.当温度逐渐升高时,水炭浆的表观黏度呈现出先降低后增加的趋势. 相似文献
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为提高新疆硫磺沟煤的成浆性能,通过提高添加率,改变煤粉粒度分布,利用中煤、乌冬、黑山3种煤与硫磺沟煤掺配混合制浆,进行成浆性实验。结果显示:硫磺沟煤可以单独制浆,但稳定性较差。单一成浆最优条件为:添加率为2.0‰,煤浆浓度最高为62.84%,此时煤浆黏度为579 mPa·s。随着煤粉通过率的提高,硫磺沟煤成浆黏度逐渐增加,稳定性明显提高。中煤、乌冬、黑山均能不同程度地提高硫磺沟煤的成浆性。硫磺沟煤与乌冬煤掺配后,煤浆稳定性的提高最为明显,与中煤质量比为4∶6时,浓度可达65.79%,黏度为578 mPa·s。 相似文献
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对碳化硅粉进行整形后分级得到1.2μm(细粉)和100肛μm(租粉)2种颗粒.对整形前后碳化硅粉的颗粒形貌、粒径分布、振实密度、素坯密度和料浆表观黏度的变化作了对比研究后发现:整形后的碳化硅颗粒球形度明显提高;细粉粒径由原始的双峰分布变为接近正态分布;细粉和粗粉的振实密度分别由原始的1,16g/cm3和 1.71 g/cm3提高到1.495g/cm3和1.905g/cm3;素坯的体积密度由2.501 8g/cm3提高到2.623 3 g/cm3,在剪切速率为0.3s-1的条件下,细粉配制料浆的表观黏度由6700mPa·s降至1100mPa·s.结果表明:颗粒粒径接近正态分布,颗粒球形度得以提高是注浆碳化硅料浆粘度得以降低、成型素坯密度得以提高的主要原因,其中,细粉的整形对料浆表观黏度的降低和注浆素坯体积密度的提高贡献最大. 相似文献
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为提高神府煤制备水煤浆的成浆性能,分析了神府煤的原煤性质,说明神府煤的成浆指标为11.55,属于很难成浆煤种。对不同粒度级配的干基煤样进行粒度分析,通过粗、细煤粉单独制浆实验和不同粒度级配煤粉的成浆性实验,研究了不同粒度级配对水煤浆成浆性的影响。结果表明:经过级配的干基煤样具有双峰粒度分布特征,适宜制浆;粗煤粉不能单独成浆,细煤粉单独制浆的最大成浆浓度为61%;粗细煤粉质量比约为1∶2时,水煤浆具有较好的流动性和稳定性,最大成浆浓度可达63.8%,此时水煤浆黏度为1000 mPa·s,符合工业水煤浆制备标准,说明合理的粒度级配可降低水煤浆黏度,增强流动性及稳定性。 相似文献
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神府煤内水含量高、氧碳比高,不利于湿法气化制备高性能水煤浆。选择神府同一矿区的原煤、洗煤,通过干磨湿配制浆,并对煤浆性能进行分析。结果表明,煤的可磨指数HGI与磨矿时间共同决定粉体的粒度分布,粉体粒度与煤浆的流动性及稳定性直接相关,磨矿过程应尽可能使粉体粒度偏细。粒度〉0.20 mm的粉体主要影响煤浆的稳定性,较多的大颗粒会因重力沉降作用导致煤浆性能变差;粒度〈0.076 mm的粉体主要影响煤浆的流动性,合适的质量比配能与大颗粒形成双级或多级级配。SFR、SFX制浆性能较好时粒度〈0.076 mm的粉体分别占45%、50%。 相似文献
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研究了水炭浆的成浆条件以及浆体的基本性能。将兰炭末原料研磨筛分为三个粒度等级(D_1200目,D_2为100~200目,D_3为60~100目)。得出以木质素磺酸钠(SL)和TPEG作为分散剂,羧甲基纤维素钠(CMC)作为稳定剂,可制备出水炭浆。设定水炭浆浓度为56%,粒度组成为D_1:D_2:D_3=80%:12%:8%,添加剂的总量占干料总量的1.5%,SL:TPEG:CMC=0.74%:0.38%:0.38%时所制备的水炭浆粘度为518mPa·s,流动性良好,稳定性长达30d,是性能优良的水炭浆制品。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献