摘要
针对延长气田某净化厂的含甲醇污水预处理装置存在结垢严重、腐蚀等问题,利用离子色谱、XRD等方法对含甲醇污水及再生塔塔板垢样进行分析,在单因素的实验基础上,以含甲醇污水的总铁、浊度为考察的总指标,采用响应面法优化得到氧化剂、碱化剂、絮凝剂及助凝剂4种预处理药剂的最佳注入量,最后验证了优化方案的可靠性。研究结果表明:含甲醇污水pH值偏低,矿化度较高,易结垢的Ca2+、Mg2+含量高;再生塔塔板垢样的主要成分为CaCO3、MgCO3,含量(质量百分比)分别为64.32%和35.58%,说明大量存在的Ca2+、Mg2+是导致甲醇再生装置结垢腐蚀的主要原因。预处理药剂的最佳加量为氧化剂832.39 mg/L,碱化剂1108.64 mg/L,絮凝剂889.01 mg/L,助凝剂57.59 mg/L,此时,预测的响应值为3.525。现场污水经优化处理后pH值为7.4,浊度为6.8 NTU,总铁含量为11.04 mg/L,均达到预处理水质指标要求;现场的设备和管线结垢、堵塞情况明显好转,由原来的1个月检修两次,降至3个月左右检修1次。
In view of the serious scaling and corrosion problems of the methanol-containing wastewater pretreatment device of a purification plant in Yanchang Gas Field, first, ion chromatography, XRD and other methods were used to analyze the methanol-containing wastewater and the scale samples of the regeneration tower tray. Based on the experiment, the total iron and turbidity of the methanol-containing sewage were used as the overall indicators. The response surface optimization was used to obtain the best injection amount of four pretreatment agents such as oxidant, alkalizer, flocculant and coagulant. The reliability of the optimized and improved program was optimized. The results show that the pH of the methanol-containing wastewater is low, the salinity is high, and the content of cations Ca2+ and Mg2+ that are easy to scale is very high;the scale sample of the regeneration tray is mainly composed of CaCO3 and MgCO3,and the content is 64.32%(w/w) and 35.58%(w/w),indicating that a large amount of Ca2+ and Mg2+ are the main causes of scaling and corrosion of the methanol regeneration unit. The optimal dosage of pretreatment agent is 832.39 mg/L for oxidant, 1 108.64 mg/L for alkalizing agent, 889.01 mg/L for flocculant, and 57.59 mg/L for coagulant. At this time, the predicted response value is 3.525. After optimized treatment, the on-site sewage has a pH of 7.4,a turbidity of 6.8,and a total iron content of about 11.04 mg/L,which all meet the requirements of pretreatment water quality. The scale and blockage of equipment and pipelines have improved significantly, from the original one Overhauled twice a month, reduced to about once every 3 months.
作者
白小芳
肖远牲
于笑丹
马鹏云
李军
Bai Xiaofang;Xiao Yuansheng;Yu Xiaodan;Ma Pengyun;Li Jun(No.2 Gas Production Plant of Yanchang Gas Field,Shaanxi Yanchang Petroleum(Group)Co.,Ltd.;CNPC Research Institute of Safety&Environment Technology)
出处
《油气田环境保护》
CAS
2021年第5期19-25,共7页
Environmental Protection of Oil & Gas Fields
关键词
含甲醇污水
预处理
工艺优化
响应面法
methanol-containing wastewater
pretreatment
process optimization
response surface methodology
