Field application of reusing the treated heavy oil wastewater by MVC process to boiler feed-water
ZOU Longsheng1,2,,, NIU Yaolan1, XIONG Ying2, TANG Jing1, LIU Tiexiang3, QIAN Xiaode4 1.Guilin University of Aerospace Technology, Guilin 541004, China 2.Chongqing Water Resources and Electric Engineering College, Chongqing 402160, China 3.Wuhan Qingchuan University, Wuhan 430204, China 4.Panjin Dade Petroleum Technology Co. Ltd., Panjin 124000, China
Abstract:A large amount of heavy oil wastewater is produced in an oil field, while steam extraction of oil needs enough clean water. The combined effect of them resulted in the shortage of water resources. In order to achieve good economic and social benefits, a 20 m3·h?1 mechanical vapor compression process for wastewater recovery was designed in this study. The system could utilize the low temperature waste heat of heavy oil wastewater, had low energy consumption in operation and low requirement for the influent wastewater quality. The water quality parameters of condensed water from the system effluent were as follows: total effluent hardness ≤182.30 mg·L?1, Cl?≤10.00 mg·L?1, Ca2+≤1.00 mg·L?1, oily ≤2.00 mg·L?1, electrical conductivity (25 °C) ≤60.00 μS·cm?1, silica ≤3.50 mg·L?1, and it met the quality standards of steam injection boiler feed-water. Based on the analysis of operation results of MVC process, the influence degrees of boiling point rising, concentration factor, condensate water quality and fouling and so on were determined, especially the influencing factors and change trend of condensed water quality. The process established a practical foundation for large-scale treatment of heavy oil wastewater and realization of zero discharge. Key words:heavy oil wastewater/ condensed water/ energy consumption/ mechanical vapor compression/ concentration factor.
图1稠油废水产生工艺 Figure1.Production process of heavy oil wastewater
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1.Guilin University of Aerospace Technology, Guilin 541004, China 2.Chongqing Water Resources and Electric Engineering College, Chongqing 402160, China 3.Wuhan Qingchuan University, Wuhan 430204, China 4.Panjin Dade Petroleum Technology Co. Ltd., Panjin 124000, China Received Date: 2019-04-15 Accepted Date: 2019-09-11 Available Online: 2020-03-02 Keywords:heavy oil wastewater/ condensed water/ energy consumption/ mechanical vapor compression/ concentration factor Abstract:A large amount of heavy oil wastewater is produced in an oil field, while steam extraction of oil needs enough clean water. The combined effect of them resulted in the shortage of water resources. In order to achieve good economic and social benefits, a 20 m3·h?1 mechanical vapor compression process for wastewater recovery was designed in this study. The system could utilize the low temperature waste heat of heavy oil wastewater, had low energy consumption in operation and low requirement for the influent wastewater quality. The water quality parameters of condensed water from the system effluent were as follows: total effluent hardness ≤182.30 mg·L?1, Cl?≤10.00 mg·L?1, Ca2+≤1.00 mg·L?1, oily ≤2.00 mg·L?1, electrical conductivity (25 °C) ≤60.00 μS·cm?1, silica ≤3.50 mg·L?1, and it met the quality standards of steam injection boiler feed-water. Based on the analysis of operation results of MVC process, the influence degrees of boiling point rising, concentration factor, condensate water quality and fouling and so on were determined, especially the influencing factors and change trend of condensed water quality. The process established a practical foundation for large-scale treatment of heavy oil wastewater and realization of zero discharge.
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