Device and method for bleed air backflow recycling multi-stage baffling microbubble flotation oil removal

A micro-bubble and air flotation technology, applied in chemical instruments and methods, flotation water/sewage treatment, multi-stage water treatment, etc., can solve problems such as short flow, low efficiency of dissolved air, and poor dissolution effect

Pending Publication Date: 2022-05-13
SINOPEC SSC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional multiphase flow dissolved air pump air flotation device is used for oil removal, and the main problems are as follows: (1) The nitrogen consumption is large during the gas dissolution process; (2) The gas dissolution efficiency is low, and most of the gas-liquid ratios are <5%. Some dissolved air pumps also need to install a gas-liquid separation tank at t

Method used

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  • Device and method for bleed air backflow recycling multi-stage baffling microbubble flotation oil removal
  • Device and method for bleed air backflow recycling multi-stage baffling microbubble flotation oil removal
  • Device and method for bleed air backflow recycling multi-stage baffling microbubble flotation oil removal

Examples

Experimental program
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Effect test

Embodiment 1

[0084] (1) The output reflux water at 70°C produced by the reflux chamber 12 and the nitrogen gas precipitated in the air flotation tank 1 enter the dissolved air pump 2 through the nitrogen gas bleed return pipeline 32 from the water suction and air supply port 21 to pressurize and dissolve to produce microbubbles The dissolved air water; the inlet pressure of the dissolved air pump 2 is 0.04MPa, and the outlet pressure is 1MPa; the particle size of the microbubbles is 20-30 μm; the gas-liquid ratio of the dissolved air water containing the microbubbles is 10%.

[0085] (2) The dissolved air water containing microbubbles enters the dissolved air water replenishment pipeline 33 through the dissolved air water outlet 22, and the oily produced raw water transported through the oily produced raw water pipeline 35 is in the dissolved air water replenished pipeline 33 It is mixed with the oil-containing production raw water pipeline 35 obliquely connected to the pipeline to obtain d...

Embodiment 2

[0091] Carry out microbubble flotation oil removal according to the method for embodiment 1, the inlet pressure of dissolved air pump 2 and outlet pressure, the temperature of production reflux water, dissolved air pump gas-liquid ratio and air saturation solubility relationship in step (1) are as follows figure 2 shown. Depend on figure 2 It can be seen that the present invention controls the inlet pressure of the dissolved air pump 2 to 0.03-0.04MPa, and when the outlet pressure is controlled to 0.9-1.0MPa, the gas-liquid ratio can reach 10 after the water at 70°C is pressurized and mixed with the reflux nitrogen in the pump. %, the efficiency of dissolved air is high, and the outlet of the dissolved air pump can no longer be equipped with a gas-liquid separation tank, which avoids the waste of nitrogen at the outlet of the dissolved air pump.

Embodiment 3

[0093] Carry out oil removal by microbubble flotation according to the method of embodiment 1, the outlet pressure of dissolved air pump 2 in step (1) and the diameter relationship figure of the microbubble that produces are as follows image 3 shown. Depend on image 3 It can be seen that the present invention controls the outlet pressure of the dissolved air pump to 0.9-1.0 MPa and then releases it under reduced pressure. The particle size of the generated microbubbles can be controlled at 20-30 μm. The oil contact area improves the degreasing effect.

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Abstract

The invention provides a device and a method for deoiling by entraining, refluxing and reusing multistage baffling microbubble flotation, and relates to the technical field of deoiling of oilfield produced water. The multistage baffling microbubble flotation oil removal device for entrained air backflow recycling comprises an air flotation tank, a dissolved air pump and an electric control system, and a vortex reactor, a T-shaped water passing opening and an adjustable oil collecting groove are arranged in the air flotation tank; a nitrogen pressure automatic balancing pipeline system, a nitrogen entraining return pipeline, a dissolved air water replenishing pipeline, a dissolved air water return pipeline and an oil-containing raw water extraction pipeline are arranged outside the air floatation tank; the air dissolving efficiency is improved and the particle size of microbubbles is reduced by controlling the inlet and outlet pressure of an air dissolving pump; the vortex reactor slows down the bubble gathering and floating speed and prevents short flow; according to the nitrogen pressure automatic balancing pipeline system, a stable gas phase space can be formed at the inner top of the air floatation tank, the liquid level is kept stable, separated nitrogen serves as a gas source of the gas dissolving pump to be recycled, and the consumption of the nitrogen is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of deoiling oilfield produced water, in particular to a device and method for deoiling oil by multi-stage baffled microbubble flotation for bleed air backflow. Background technique [0002] Micro-bubble flotation oil removal in the oil-bearing produced water technology in oilfields, that is, air flotation oil removal, is to generate a large number of fine air bubbles in the water through the dissolved air system, so that the air is attached to the suspended particles in the form of highly dispersed fine air bubbles, resulting in The density is less than that of water, and the principle of buoyancy is used to make it float on the water surface, so as to realize the water treatment process of solid-liquid separation or liquid-liquid separation. At present, the air flotation methods are mainly divided into dissolved air flotation, multiphase flow dissolved air pump air flotation, jet air flotation, electroflocc...

Claims

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Application Information

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IPC IPC(8): C02F1/24C02F101/32C02F103/10
CPCC02F1/24C02F2101/32C02F2103/10C02F2301/08
Inventor 张磊赵桂龙黄文升李毅陈俊亮孙青张光辉呙如地王晓光邵帅顾婧杨立业徐辉张锐
Owner SINOPEC SSC
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