共查询到17条相似文献,搜索用时 187 毫秒
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论述了循环水系统总铁来源,碱度对总铁的影响,现场监测结果与总铁的平衡及余氯对总铁的影响.结果表明,循环水系统总铁的高低与补充水中总铁、浓缩倍数、碱度控制范围有关.在碱度较低时,循环水中总铁与碱度呈负相关关系.当系统碱度超过一定范围(130 mg/L)以后,大部分铁离子形成沉积垢,总铁基本维持在低位且变化不大,此时用总铁判断系统腐蚀趋势已失去意义,应以现场监测结果为准.如果总铁稳定在一定范围内,并不持续升高,应属正常,否则就要细查原因,尤其要查氧化性杀菌剂的投加方式和投加量引起的系统腐蚀问题. 相似文献
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论述了循环水系统Fe2 和Fe3 (总铁质量浓度)来源,碱度对总铁质量浓度的影响,现场监测结果与总铁质量浓度的平衡及余氯对总铁质量浓度的影响.结果表明,循环水系统总铁质量浓度的高低与补充水中总铁质量浓度、浓缩倍数、碱度控制范围有关.在碱度较低时,循环水中总铁质量浓度与碱度呈负相关关系.当系统碱度超过一定范围(130 mg/L)以后,大部分铁离子形成沉积垢,总铁质量浓度基本维持在低位且变化不大,此时用总铁质量浓度判断系统腐蚀趋势已失去意义,应以现场监测结果为准.如果总铁质量浓度稳定在一定范围内,并不持续升高,应属正常,否则就要细查原因,尤其要查氧化性杀菌剂的投加方式和投加量引起的系统腐蚀问题. 相似文献
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通过对循环水总碱度偏低原因的分析,研究了气体SO2泄漏对循环水系统设备腐蚀的影响。采取加碱、大量排水补水的方法并加入15~20mg/L缓蚀增效剂等措施,使循环冷却水中总铁的质量浓度由0.7mg/L降至0.3mg/L,腐蚀速率控制在0.0405mm/a。 相似文献
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循环冷却水采用旁流弱酸处理后,由于工艺改变了循环水运行的碱度、硬度,对判断循环水系统是否结垢带来了困难。通过在循环冷却水的动态模拟试验过程中监测凝汽器管的污垢热阻,循环水的碱度、硬度、pH的变化以及试验结束后观察试片的表面状态等方法,对循环水系统是否结垢进行了探讨。 相似文献
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第一循环水系统,因甲醇洗装置丙烯换热器泄漏,导致循环水CODcr、浊度、总铁突然升高,循环水呈黄褐色状,细菌量剧增,水质明显变差,换热效率降低。经过系统分析排查、微生物控制、采取性粘泥剥离、排污置换、持续监测等应急措施后,恢复循环水系统正常运行。 相似文献
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A. Herman 《Journal of the American Ceramic Society》1941,24(10):323-327
To secure reproducible results with the chemical durability test in which distilled water is used as the leaching medium, the distilled water must be prepared with special care because certain impurities, of which copper is the most important, are present in small quantities and exhibit a marked effect on alkalinity values. Other impurities, such as lead, iron, sodium silicate, and sodium carbonate, which may be found occasionally in distilled water, do not have as great an effect as copper on alkalinity values. The temperature at which the leaching is carried out has a much greater effect on the test than the length of the test period. 相似文献
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研究了生化处理后焦化废水回用于转炉除尘水系统时CODCr和温度对水的pH和碱度的影响作用,揭示了回用水水质变化的规律.研究表明焦化废水处理水随着蒸发浓缩作用的进程,pH和碱度持续地呈降值变化趋势,由弱碱性水转化为酸性水.在实验设置温度范围内恒温温度的增高对pH的降值速率的变化影响不大,但对碱度降值速率变化的影响比pH的明显要大;焦化废水处理水在此工况下pH和碱度的变化趋势异于普通水在蒸发浓缩进程中pH和碱度均持续地呈增高变化的情况.该研究结果为焦化废水回用的后续技术处理,筛选水质稳定药剂配方提供了依据. 相似文献
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在小试条件下,以石英砂为载体,利用表面负载的铁锰复合氧化膜研究了地表水和地下水催化氧化去除锰的效果差异。结果表明,保持相同的操作条件,地表水中锰去除率(20%)远不及地下水(40%)。通过对比水质参数,认为该差异可能主要取决于水中pH和碱度。将地表水pH提高至和地下水相同,去除效果未见大幅提升;而将碱度提高至和地下水相同时去除效果有较大改善,锰去除率由20%提高至40%,认为碱度含量的不同是导致不同水源水中锰去除效果差异的主要原因。进而在提高碱度至120 mg/L的基础上改变其他运行条件,以寻求保持活性氧化膜去除地表水中锰的有效方法。发现降低进水锰浓度、滤速,增加滤层厚度均有助于提高去除效率,几乎可达到与地下水相同去除率。 相似文献
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为了在准确测量锅水碱度的前提下节约试剂,以煤粉工业锅炉的锅水为对象,研究了试剂用量和锅水取样体积对锅水碱度测量结果的影响。首先取样锅水100 m L,研究了酚酞和甲基橙试剂的用量对酚酞碱度和全碱度测量结果的影响;然后分别取样锅水100、50、25 m L,对比了取样体积和试剂用量对锅水碱度测量结果的影响。结果表明:酚酞和甲基橙试剂用量不同会导致溶液颜色不同,但对锅水碱度测量结果没有影响;锅水取样50 m L时,测量到的锅水碱度值与取样100 m L时基本相同,但锅水取样25 m L时测量误差较大。因此,从节约硫酸标准溶液和试剂的角度出发,测量锅水碱度时建议取样50 m L锅水、使用1滴酚酞试剂和1滴甲基橙试剂。 相似文献
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《分离科学与技术》2012,47(14):3217-3228
Abstract Polyaluminum Silicate Chloride (PASiC) is a new water treatment coagulant. It contains silica that can be hydrolyzed to produce SiO2 as coagulant aid. Hence, this coagulant consumes little alkalinity and is effective at low dosages. It is, therefore, especially suitable for treating water of low alkalinity and low turbidity. When manufacturing PASiC, the alkalinity solution involved in the polymeric reaction must be added slowly to the aluminum salt solution to avoid local over‐saturation which enhances the production of high‐valence medium polymer species (Alb) (e.g. Al12AlO4(OH)24 7+, Al13). In this research, the use of an ultrasonic vibrating system to assist the alkalinity dosing during the formation of PASiC was studied. The ultrasonic vibrating system breaks up the NaOH solution into fine mists so that the latter can be more evenly dispersed into the aluminum silica solution to avoid local over‐saturation. This ultrasonic‐assisted NaOH dosing method leads to a more stable polymerization of aluminum changing ratios of Ala, Alb, and Alc in the final product and raising the Alb portion in the coagulant. Long‐term observations also show that PASiC prepared with the ultrasonic‐aided NaOH dosing at 0.25 mL/min is more effective in removing turbidity. 相似文献
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Klaus J. Hüttinger 《Fuel》1983,62(2):166-169
Experimental results on iron-catalysed hydrogasification and water vapour gasification of a variety of carbons and coals are summarized. The influence of temperature, total pressure, water vapour partial pressure, catalyst introduction, catalyst amount and distribution, organic and inorganic bound sulphur and the caking of coals are discussed. Poisoning of catalyst iron by sulphur seems to be the most severe fundamental problem. 相似文献