Axial-flow coaxial membrane tube microbubble uniform mixing device

Abstract

The invention provides an axial-flow coaxial membrane tube microbubble uniform mixing device which is used for floatation treatment of oily sewage and industrial wastewater. By adopting the coaxial membrane tube / electric-drive multistage-series helical blade special structure, the axial-flow coaxial membrane tube microbubble uniform mixing device implements organic combination of the microporous cyclone foaming and bubble crushing pressurized uniform mixing technique. The membrane tube assembly completes microporous cyclone primary foaming and generates a microbubble-carrying two-phase flow, and the large-diameter membrane tube is combined with the cyclone teeth and high-speed rotating blades, thereby increasing the foaming area of the rotating liquid flow, enhancing the utilization ratio of the floatation gas and implementing the membrane tube inside / outside bidirectional jet high-efficiency foaming. The pressurized uniform mixer completes axial-flow crushing secondary foaming and generates a small-particle-size bubble flow, the multistage-series helical blades shear and crush the bubbles, and the mixing uniformity between the microbubbles and sewage is high, thereby simultaneously implementing the functions of bubble spiral pressurization and self-cooling. The foaming uniform mixing control system remotely and automatically controls the floatation gas flow rate in the gas supply manifold, the sewage flow rate in the liquid supply manifold and the rotating speed of the variable-frequency motor.

Description

technical field [0001] The invention relates to a micro-bubble two-phase flow generating device for air flotation treatment of industrial wastewater and oily sewage, in particular to a coaxial membrane tube component microporous swirl foaming and micro-bubble and sewage pressurized uniform mixing shaft Flow device and its process flow. Background technique [0002] According to the formation mechanism of fine bubbles, air flotation treatment technology is divided into pressurized dissolved air flotation (Dissolved Gas Flotation), multiphase dissolved air pump air flotation, induced gas flotation (Induced Gas Flotation), etc., the current industrial wastewater and oily sewage (hereinafter Collectively referred to as sewage) treatment is mainly based on pressurized dissolved air flotation and induced air flotation technology. [0003] The bubble particles produced by the conventional pressurized dissolved air flotation technology are small, but the system composition is compl...

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Problems solved by technology

[0003] The bubble particles produced by the conventional pressurized dissolved air flotation technology are small, but the system composition is complex, and it needs supporting equipment such as gas compressor, packing dissolved air tank, air releaser, etc., which makes the equipment consume more energy and occupy a relatively small area. Big

Multiphase dissolved air pump air flotation technology, such as the ONYX-Micro Bubble pump of the American ExterranTM company and the dissolved air pump of the German Edur company, etc., the system configuration is simple, easy to operate and maintain, but its power consumption and the cost of the pump itself cannot be ignored, and many Compatible air pump has a strong emulsification effect on the sewage to be treated, which will cause a significant reduction in purification efficiency

The disadvantage of mechanically induced air flotation in induced air flotation technology is that the maintenance of the rotating parts of the mechanical system is complicated, and the system cannot perform backflow operation, and it is difficult to control the liquid level of the impeller rotary cutting air flotation machine, and it is more prone to short flow and Dead flow area; hydraulically induced air flotation such as Wemco ISF Systems of Natco Company in the United States and domestic YFP jet-type induced air flotation machines, etc., the power consumption of this technology is low, and there are no rotating parts in the jet, and the shear force is small, which will not cause The breakage of adherents, but the particle size of the microbubbles is large, and its efficiency is greatly affected by the outlet aperture of the ejector, and the requirements for water quality and pressure entering the nozzle are relatively strict, and small fluctuations may have a greater impact on the purification efficiency. big impact

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