Pre-treating process for sewage from thick oil refining
A technology for refining sewage and pretreatment, which is applied in the fields of flotation water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Really solve the problems of super heavy oil sewage treatment, achieve significant social and economic benefits, and realize the effect of resource utilization
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Embodiment 1
[0028] Embodiment 1 Ultra-heavy oil refinery wastewater pretreatment process flow
[0029]Please refer to Figure 1. The ultra-heavy oily sewage first enters the regulating water tank 1, which serves as a buffer tank for the sewage to enter the treatment system to provide stable water quality and quantity for the process operation, and complete the recovery of floating oil and dispersed oil in the sewage and the removal of sediment Removal; adjust the outlet water of the water tank 1 and the demulsifier from the demulsifier tank 2 to be mixed in the pipeline, and then be lifted by the pump 3 into the sedimentation deoiling tank 4. At this stage, most of the emulsified oil and dissolved oil in the water body are recovered, and the effluent Introduced into the buffer tank 5; the water in the buffer tank 5 is pressurized by the lift pump 6 according to the appropriate flow rate, and then sent to the cyclone oil-water separator 7 for oil-water separation (working pressure 0.2-0.6MPa...
Embodiment 2
[0034] Embodiment 2 dissolved air flotation machine
[0035] The dissolved air flotation machine used in the flow process of embodiment 1 can be conventional pressurized dissolved air purification mechanism, also can be such as figure 2 and image 3 The dissolved air flotation device described.
[0036] refer to figure 2 and image 3 , The air flotation device of this embodiment mainly includes a flotation cell, a dissolved air and release system, and a slag scraping system.
[0037] The inlet and outlet ports 211, 212 of the flotation cell 21 are respectively arranged at appropriate positions on the side lower parts of the left and right lower parts of the housing 22 (the position in the lower part of the side is basically the center in the figure), and the other side upper part of the flotation cell 21 is arranged The slag outlet 213, the dissolved air water outlet of the dissolved air device (the part shown in the dotted line box in the figure) is connected to the regul...
Embodiment 3
[0044] Among the pollution sources produced by the various units of PetroChina Liaohe Petrochemical Company, the ultra-heavy oil sewage has the greatest impact on the sewage field, which is also a special case in my country's refining and chemical enterprises. According to the process and operation of Example 1 and Example 2, the ultra-heavy oil sewage pretreatment process was first successfully realized industrial application in Liaohe Petrochemical Branch. The design processing capacity is 60t / h; including process equipment and infrastructure, the total investment of the project is 7.02 million yuan; the operating cost is 3.05 yuan / ton of sewage, the recovery rate of petroleum is as high as 95%, and the annual profit is more than 2 million yuan / year. achieve the expected performance.
[0045] Refer to the description of Example 1 for the specific process operation of the pretreatment of the ultra-heavy oil refinery wastewater in the Liaohe Oilfield of PetroChina, wherein, bo...
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Abstract
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