高压旋喷工艺在上海某污染场地修复中的应用研究

发布时间：2018-01-04 15:19

本文关键词：高压旋喷工艺在上海某污染场地修复中的应用研究　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：在采用土壤原位化学氧化还原技术治理上海这种高粘性的受污染地层时,传统的注入井注射药剂的方式存在治理周期长、修复效果不理想等问题,因此在污染场地治理中运用高压旋喷注浆技术来弥补传统药剂注入方式的不足,达到修复目的。为了得到适用于土壤原位化学氧化还原修复技术的高压旋喷注浆工艺,本文进行了相关的研究,研究内容和成果如下:研究了高压旋喷工艺的工作原理、高压射流的流体性质和高压射流破坏土体的作用机理,并归纳总结了喷嘴出口处的流量计算公式、高压旋喷工艺的注浆量计算公式和有效作用直径的估算公式。选用过硫酸钠和亚硫酸氢钠两种常用的修复药剂进行浸泡实验,研究这两种试剂溶液对高压旋喷设备中的钻杆、喷嘴、密封圈和高压管的腐蚀性,并采用304、310、316L这三种不锈钢进行对比实验。实验发现这两种溶液对密封圈、高压管和三种不锈钢没有腐蚀性,对钻杆和喷嘴具有不同程度的腐蚀性,在10%的质量浓度中过硫酸钠溶液中试件最大的减重率为10.09%,相同质量浓度的亚硫酸氢钠溶液中试件最高的减重率仅为1.05%,过硫酸钠的腐蚀性比亚硫酸氢钠强。试验中还发现在亚硫酸氢钠溶液中试件的表面附着有大量的结晶体,而过硫酸钠溶液中并没有出现这一现象。采用环保型的染料溶液和水泥浆进行了高压旋喷的现场模拟实验。通过实验得到了适用于上海这种高粘性地层中的土壤原位修复高压旋喷工艺参数,具体参数设计为泵压25MPa,单喷嘴,喷嘴直径2.5mm,旋转速度为15r/min,提升速度15~30cm/min,动态螺距1~2cm/r。针对上海某污染场地设计了土壤修复方案。采用以原位化学修复技术为主,气相抽提修复技术为辅的组合修复技术,并且运用高压旋喷注浆技术的药物注入方式来治理该受污染地块,使其污染物降低到修复目标指以下,恢复其使用价值。
[Abstract]:In the treatment of high viscosity polluted formation in Shanghai by in-situ chemical redox technology, the traditional injection method of injection well has some problems, such as long treatment period and unsatisfactory remediation effect. Therefore, in the treatment of contaminated sites, high pressure rotary grouting technology is used to make up for the shortcomings of the traditional injection methods. In order to obtain the high pressure rotary jet grouting technology suitable for in situ chemical redox remediation of soil, this paper has carried on the related research. The research contents and results are as follows: the working principle of high pressure rotary jet technology, the fluid properties of high pressure jet and the mechanism of high pressure jet destroying soil are studied, and the calculation formula of flow rate at nozzle outlet is summarized. The calculation formula of grouting quantity and the estimation formula of effective action diameter of high pressure rotary jet technology. The soaking experiment was carried out with two kinds of commonly used repellents, sodium persulfate and sodium bisulfite. The corrosion of these two reagent solutions to drill pipe, nozzle, seal ring and high pressure pipe in high pressure rotary jet equipment was studied, and 304,310 was used. The results show that the two solutions are not corrosive to sealing ring, high pressure tube and three kinds of stainless steel, and are corrosive to drill pipe and nozzle to varying degrees. The maximum weight loss rate of sodium persulfate solution and sodium bisulfite solution was 10.09 and 1.05% respectively. The corrosion of sodium persulfate is stronger than that of sodium bisulfite. It is also found that a large number of crystals are attached to the surface of the sample in sodium bisulfite solution. However, this phenomenon was not found in sodium persulfate solution. Environmental friendly dye solution and cement slurry were used to carry out the field simulation experiment of high pressure rotary jet injection. The soil suitable for this kind of high viscosity formation in Shanghai was obtained through the experiment. In-situ repair of high pressure rotary spray process parameters. The parameters are designed as pump pressure 25MPa, single nozzle, nozzle diameter 2.5mm, rotating speed 15r / min, lifting speed 1530cm / min. A soil remediation scheme was designed for a polluted site in Shanghai with a dynamic pitch of 1 ~ 2 cm / r.Combinatorial remediation technique was adopted, which was based on in-situ chemical remediation technology and supplemented by gas extraction remediation technique. The drug injection method of high pressure rotary grouting technology is used to treat the contaminated plot, so that the pollutant can be reduced to the target of restoration, and its use value will be restored.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X53

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