Rotational flow deoiling method for sulfur bearing sewage

A technology for sulfur sewage and sewage, which is applied in the field of dispersing oil and emulsified oil, and removing floating oil in sewage. It can solve the problems of increased pump energy consumption, unsatisfactory degreasing effect, and low degreasing efficiency, so as to improve efficiency and improve The recovery rate and the effect of improving the separation efficiency

Inactive Publication Date: 2004-11-03
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

However, for the sulfur-containing oily sewage system, the oil droplets still have fragmentation and emulsification, the oil removal efficiency is low (less than 40

Method used

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  • Rotational flow deoiling method for sulfur bearing sewage
  • Rotational flow deoiling method for sulfur bearing sewage

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] For the implementation plan of sulfur-containing sewage under atmospheric and vacuum pressure or the sulfur-containing sewage system whose pressure is lower than the working pressure of the cyclone, see figure 1 . exist figure 1 Among them, the pressure of the sulfur-containing sewage in the container is 0-0.02MPa, which is less than the minimum driving pressure of the cyclone, and the sulfur-containing sewage needs to be pressurized. The frequency conversion centrifugal pump is used to increase the pressure of the sulfur-containing sewage to 0.45-0.55MPa, and enter the cyclone through the basket filter, and the cyclone separates the sulfur-containing sewage into two parts, the oil phase and the water phase, and the pressure of the oil phase is 0.05 ~0.1MPa, water phase pressure is 0.25~0.30MPa, oil phase flow rate is 18% of water phase flow rate. The oil phase automatically returns to the container under its own pressure, and the water phase flows into the downstream...

Embodiment 2

[0056] See figure 2 . exist figure 2 Among them, the pressure of the sulfur-containing sewage in the container is 0.75-0.8MPa, which is greater than the minimum driving pressure of the cyclone, so the sulfur-containing sewage does not need to be pressurized. The sulfur-containing sewage directly enters the cyclone through the basket filter, and the cyclone separates the sulfur-containing sewage into two parts: oil phase and water phase. 10% of the water phase flow. . The oil phase returns to the container after being pressurized by the gear pump, and the water phase flows into the downstream device through the liquid level control valve of the container. The oil accumulated in the inner cavity of the cyclone is discharged regularly through the oil collecting pipe. When the concentration of the sulfur-containing sewage is 860ppm, the oil concentration of the separated water phase is 200ppm, and the oil removal rate of the sulfur-containing sewage reaches more than 77%. ...

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Abstract

The vortex oil eliminating method can eliminate dispersed oil, emulsified oil and floated oil effectively from sulfur containing sewage. It features the effective combination of liquid-liquid separating cyclone, container, control valve, frequency varying pump, filter and pipeline and the optimized operation conditions. The booster pump is made to operate always near designed flow rate by means of frequency varying speed regulating technology, and this can reduce the leakage of liquid from the pump and the breaking of oil drop obviously. For sewage with oil concentration less than 1000 ppm, the ratio between oil phase flow rate and the water phase flow rate in the cyclone is controlled in 8-18 % to avoid jamming in the oil phase outlet and raise the operation reliability. The said method has high separation efficiency, low cost, high oil recovering rate and other advantages.

Description

technical field [0001] The invention relates to a method for removing slick oil, dispersed oil and emulsified oil in sewage, and belongs to a sewage treatment process, in particular to a method for removing oil from sulfur-containing sewage (oil-containing and sulfur-containing sewage) in a petrochemical system. Background technique [0002] In petrochemical installations, the current methods for removing oil from sulfur-containing oily sewage (referred to as sulfur-containing sewage) include simple grease traps, advection grease traps, inclined plate grease traps, filtration and activated carbon adsorption [Petrochemical Environmental Protection Handbook, Beijing: Hydrocarbon Processing Press: First Edition in 1990]. These methods can be summarized into two categories: gravity sedimentation and filtration. Filtration uses a filter to collect oil, which requires regular backwashing; gravity settling is to place sulfur-containing sewage in a large...

Claims

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Application Information

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IPC IPC(8): C02F1/40
Inventor 汪华林钱卓群王建文
Owner EAST CHINA UNIV OF SCI & TECH
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