Effect of NTP Pretreatment on Thermal Resistance and Fouling Components of Oilfield Wastewater

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Zhao, Jie^1 ; Li, Wenli^1 ; Zou, Longsheng^2 ; Fu, Honghun^1

Chongqing Energy College, Chongqing

402260, China^1

Chongqing Water Resources and Electric Engineering College, Chongqing

402160, China^2

关键词: Concentrated solution;    Evaporation process;    Heavy oil wastewaters;    Low temperature plasmas;    Oilfield wastewaters;    Plasma pre-treatment;    Steam concentrations;    Water quality problems;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/3/032029/pdf
DOI  :  10.1088/1755-1315/108/3/032029

来源: IOP

【 摘 要 】

In order to prevent scaling in the process of oilfield wastewater evaporation, low temperature plasma is used for pretreatment of heavy oil wastewater. It reacts with the ions and radicals produced by the low-temperature plasma and then is send into the evaporator. The changes of various indexes of the distilled water and the distribution of fouling in the evaporation process of heavy oil wastewater after plasma pretreatment were studied. The results showed that the content and hardness of silica in wastewater were decreased after plasma pretreatment, which was more suitable for evaporation treatment. At the same time, the content of salt and oil in distilled water is reduced, and the quality is improved. In addition, when the steam concentration was 30∼40 times, the suspended solids in the concentrated solution of the wastewater increased significantly after the plasma treatment. Correspondingly, the fouling at the bottom of evaporator is greatly reduced. Comparing the various indexes of distilled water and the feed water index of gas injection boiler, it can be seen that the excessive oil content in distilled water is the biggest obstacle to the recovery of distilled water to boiler feed water. Low temperature plasma pretreatment can provide a quick and new way to solve the scaling problems and water quality problems in the recovery of distilled water from a large number of heavy oil wastewater.