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以α-甲基丙烯酸、丙烯磺酸钠为原料合成的阴离子型分散剂PMS,和以α-甲基丙烯酸、丙烯磺酸钠、苯乙烯为原料合成的复合型分散剂MSS,分别用于水煤浆制浆,首先考察2种分散剂对水煤浆的黏度、流变性及稳定性的影响,并采用红外光谱、凝胶色谱等物理方法对产物进行分析。研究发现,与PMS相比,改进后的复合型分散剂MSS性质稳定,改善了水煤浆性能,具有很好的降黏效果,并明显增强了浆体的静态稳定性。 相似文献
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以2-萘酚、浓硫酸和甲醛为原料合成了磺化萘酚甲醛(NPF)水煤浆分散剂.首先探讨了分散剂的合成条件对其性能的影响并进行了性质分析;其次,通过NPF与萘系(NSF)分散剂进行复配改善了NSF的稳定性能.结果表明,当甲醛和2-萘酚的配比为0.86:1,聚合温度为130℃,反应时间为2h时分散剂性能最好.用此分散剂,在分散剂用量为0.5%,煤浆浓度为64%时,水煤浆黏度为463mPa·s,分散性能良好.萘系(NSF)水煤浆分散剂中NPF的掺杂量为20%时,水煤浆黏度降低了150mPa·s,7d后析水率下降1.07%,无硬沉淀出现,稳定性提升明显. 相似文献
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合成了两种以丙烯酸和苯乙烯磺酸钠为主链,淀粉以及甲氧基聚乙二醇(MPEG600)分别为侧链的聚羧酸系分散剂,将两种分散剂用于制备水煤浆,考察聚羧酸系分散剂的侧链结构对水煤浆性能的影响。结果表明,以淀粉为侧链的PC-St分散剂具有较好的分散降粘能力,且当PC-St分散剂用量为0.45wt.%时,水煤浆的最大成浆可达66.5wt.%,且PC-St水煤浆的稳定性也高于PC600水煤浆。 相似文献
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针对含磷或含氮水处理药剂长期使用造成水体富营养化的问题,以衣康酸和甲基丙烯磺酸钠为原料,合成了一种无磷非氮型阻垢分散剂.通过静态实验法评定阻垢分散性能,测定生物降解性能.结果表明,在原料衣康酸与甲基丙烯磺酸钠质量比为10:5时,综合性能最佳:药剂使用量分别为30和75 mg·L-1时,对碳酸钙和磷酸钙的阻垢率均可达10... 相似文献
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Volatile oil markets experienced in the seventies have promoted renewed interest in coal-based fuel technologies. Coal-slurry fuels have emerged as viable technical alternatives for oil and gas in utility and industrial boilers. Despite current low prices and the abundance of oil, concerns over its long-term availability and price, as well as strategic considerations, make coal-slurry technology attractive. Initially, coal-slurry fuels were based on coal-oil mixtures, now the emphasis is largely on coal-water fuels. This review assesses the status of the relevant technology. It covers the preparation of coal-slurry fuels, slurry properties, combustion characteristics, emissions, current applications and concludes with their future outlook. 相似文献
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Experiments conducted with water slurries of 1 mm particles of specific gravity 1.59 in a laboratory pipeline 0.105 m in diameter have provided evidence of a change in the friction mechanism at velocities above 3 m/s. These flows were stratified and at low velocities the frictional pressure gradients were in satisfactory agreement with the predictions of the conventional two‐layer model. However at higher velocities the friction is substantially lower than predicted. Measurements of concentration and velocity distributions within the pipe show that no major change in flow regime occurs concurrently with the change in the friction mechanism. It appears that the effect is due to a change in the nature of the particle‐wall interaction, of a type which suggests that an inward‐acting force affects the particles adjacent to the wall. 相似文献
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油气井固井施工完成之后,环空水泥石在如憋压、射孔、压裂、酸化、修井以及水泥石收缩和地层蠕动等作用下将受到一定程度的破坏,产生裂缝或微环隙,造成油气井封固失效,影响油气资源的开采。试验将一种新型水泥外加剂——自愈合剂RZ引入油气井水泥,以探究其自修复能力。研究表明:被破坏后的自修复水泥石试样在养护8周后,渗透率降至0.2 mD以下。试验还结合相关微观分析手段对自修复水泥石进行了微观分析,提出了自修复水泥的修复机理,包括二次水化、结晶沉淀、渗透结晶、膨胀封堵等理论。 相似文献
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Samir F. Moujaes 《加拿大化工杂志》1984,62(1):62-67
A study has been conducted on a slurry flow behavior in vertical tubes having diameters of one inch in an upflow mode. A tube sampling technique and an optical electronics method were developed to determine the slurry concentration and flow rates for flurries comprised of different size particles. These methods will be applied in cold flow simulation of a shell and tube slurry heat exchanger. 相似文献
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An experimental study of the errors arising in side wall sampling has been conducted. A two-dimensional model provides qualitative explanation of these errors but, unlike probe sampling, quantitative prediction of sampling efficiency is not possible because the flow to the sampler is more complex. The experiments show that serious errors in concentration or particle size distribution can arise unless the particles are fine, the concentration is high and a very high sampling velocity is used. A projection extending from the pipe wall was found to improve sampling efficiency. However this improvement was of marginal value because the complex nature of the flow precluded a simple theoretical prediction. 相似文献