【作者】 王玉晨；

【导师】 聂麦茜； 赵世杰；

【作者基本信息】 西安建筑科技大学 ， 建筑与土木工程， 2007， 硕士

【摘要】 随着我国工业生产的迅猛发展,水污染日趋严重。而水资源的短缺已成为国家经济持续发展的制约因素,工业污废水处理后回用是解决水资源不足和缓解水环境污染的有效方法之一。本论文以包钢高炉煤气洗涤水处理系统为对象,进行了较系统的研究,以期解决包钢高炉煤气洗涤水的循环利用问题,研究获得了如下成果:1、论文以国内外各钢铁企业高炉煤气洗涤水处理系统运行实践为基础,分析了高炉煤气洗涤水混凝沉淀处理技术的发展现状,以包钢高炉煤气洗涤水处理系统为试验对象,进行了静态和动态混凝沉淀试验,筛选出以聚合硫酸铁、聚丙烯酰胺、石灰复合混凝剂作为最佳的混凝剂处理包钢高炉煤气洗涤水,并通过试验确定了复合混凝剂最佳配比及最佳运行参数为:聚合硫酸铁10 mg/L、聚丙烯酰胺0.1 mg/L、石灰25～250 mg/L;pH=8.5左右;沉淀池停留时间:1.5h;混合槽停留时间:2min;反应槽停留时间:10min。2、在最佳运行工况下:出水悬浮物(SS)低于120 mg/L,去除率在93%左右;出水有机物(COD)低于30mg/L,去除率在96%左右;达到高炉洗涤水质要求(指标为SS＜120 mg/L)。经过沉淀试验研究,处理过的洗涤水出水水质完全符合高炉洗涤水水质要求。3、包钢高炉煤气洗涤水经过处理后循环使用,基本实现密闭循环但同时也造成了水质结垢加速、系统结垢严重的后果。因此对该洗涤水回用时进行脱垢问题的研究,使洗涤水脱垢后回用效果更好。其结论是:在动态试验的基础上,先投加聚合硫酸铁、聚丙烯酰胺、石灰作为复合混凝剂进行混凝沉淀处理后,投加25ppm水质稳定剂XF-B-01。一方面对包钢高炉煤气洗涤水系统钙、镁结垢的处理十分有效,起到了降低结垢速率的作用。另一方面对锌有非常良好的分散稳定作用,能起到“使锌结垢速率降低,逐渐达到不结垢状态”的作用。4、对混凝处理高炉煤气洗涤水污泥处理工艺进行改进,实施了提高压滤机运行效率的可行性措施,实现年节约滤板20块,滤机每月连续运行时间600h,出泥量达到月产4500t的水平。更多还原

【Abstract】 With a quick development of our country’s industry, water pollution has turned out to be increasingly serious. And the short of water resources is becoming one of bottlenecks in a sustained development of our country’s economy. Re-use of treated polluted and waste water of industry is one of the most effective methods to solve and relieve the water problems mentioned above. In order to have a cycle use of the blast furnace gas washing water of Baogang, the paper has systematically investigated and studied the existent blast furnace gas washing water-processing system in Baogang, resulting in as following:1. Based on the performance and practice of blast furnace gas washing water processing systems form various steel enterprises home and abroad, present development situation of treatment technology of concrete precipitate of blast furnace gas washing water is analyzed; on the blast furnace gas washing water-processing system in Baogang, Experiments of static and dynamic concrete precipitating have been carried on, having chosen poly Ferro, Polyacrylamide, lime compound concrete agent as the best concrete agent to treat the blast furnace gas washing water and having proved that the best blending rate of the compound concrete agent as well as the best operating parameters: poly Ferro sulphate 10 mg/L, Polyacrylamide 0.1 mg/L, lime 25～250 mg/L; pH = about 8.5; remaining time in precipitating tank: 1.5h; remaining time in mixing trough: 2mm; remaining time in reacting trough: 10 min.2.Under the best operating situation: out water suspended substance (SS) is lower than 120 mg/L with removing rate of about 93%; out water organic substance (COD) is lower than 30 mg/L with removing rate of about 96%; both above have met the requirement of blast furnace washing water quality the index of which is that SS is less than 120 mg/L. The research has proved that the quality of the processed washing water totally meets the requirement of blast furnace washing water.3.The closed cycle use of the processed blast furnace gas washing water is basically realized, but at same time, the serious subsequence of increased incrustation forming in the system is coming out. Therefore, the research has been done for prevention of the incrustation forming and the conclusion is that: Based on the dynamic experiment, after the treatment of the concrete precipitating with the fed in Poly Ferro, Polyacrylamide and lime as the compound concrete agent, 25ppm of water quality stabilizing agent XF-B-01 is put in. By doing this, the treatment of calcium and magnesium incrustation forming in the Baogang blast furnace gas washing water system becomes quite effective having decreased the speed of incrustation, and on the other hand, effect of dispersion and stabilization of zinc comes into being with gradually getting rid of zinc incrustation as a result.4. Improvement of the treatment technology of sludge in blast furnace gas washing water is made and feasible measures of increasing operating efficiency of the squeezing strainer is implemented saving 20 strainer cores annually, keeping the strainer working for 600 hours without any interruption monthly and reaching a level of output of 4500 tons of sludge per month.更多还原