Complete device and method for enhancing oil-water separation by combining fiber particles and double bubbles

Abstract

The invention provides a complete device and method for enhancing oil-water separation by combining fiber particles and double bubbles, and the complete device comprises a demulsification filtering unit and a rotational flow air flotation unit; the demulsification filtering unit is an oleophylic and hydrophobic fiber filter, and the interior of the demulsification filtering unit comprises a plurality of stages of fiber particle beds from top to bottom, and the demulsification filtering unit is used for coalescing, demulsifying and separating emulsion; the rotational flow air flotation unit is a double-bubble jet rotational flow type air flotation device, an air flotation inner cylinder is arranged in the air flotation device, and a first-stage bubble generator and a second-stage bubble generator are sequentially arranged in the air flotation inner cylinder from bottom to top and used for generating bubble groups and separating oil and water under the air flotation effect; a circulating injection mechanism comprising an entrainment nozzle is arranged on the air floatation inner cylinder, a swirling flow field is formed in the air floatation inner cylinder, and liquid drop collision and separation are accelerated; oil-water separation is enhanced through coupling of the circulating injection mechanism, the first-stage bubble generator and the second-stage bubble generator. The complete device and the method have the advantages of stable operation, wide adaptability, high oil-water separation efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of oil-water separation, and in particular relates to a complete set of equipment and a method for oil-water separation enhanced by fiber particles combined with double bubbles, which are suitable for the treatment of oily wastewater in offshore oil and gas platforms, petrochemical industry, textile printing and dyeing and other fields. Background technique [0002] Petroleum and various petroleum derivatives are important basic substances to promote the development of the national economy and technology. With the deepening of oil field exploitation, the water-oil ratio of the produced fluid is continuously increasing, which not only increases the cost of exploitation, but also causes a large number of pollution of water environment. In addition, the oily wastewater discharged from petrochemical, textile printing and dyeing, industrial processing and other industries contains hydrocarbons such as alkanes, na...

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Problems solved by technology

Among them, the gravity separation method is currently the most commonly used separation method for oil-water mixing. It can handle dispersed oil and floating oil in oil-water, remove oil droplets with a particle size greater than 60 μm, and can handle large quantities of oil-water mixtures. The separation effect is stable, but the disadvantage is that it occupies The ground area is large; the ultrasonic method can deal with the dispersed oil and emulsified oil in the oil-water mixture, remove the oil droplet size greater than 10 μm, and the separation effect is good, but the ultrasonic equipment is expensive and can only handle a small amount of oil-water mixture; the microbial method is used , use oil-eating bacteria to transform and decompose hydrocarbons, and convert oils into non-toxic substances such as fatty acids, carbon dioxide, and water. It has the advantages of cleanliness, environmental protection, and high efficiency. However, maintaining the reproduction of microorganisms requires strict conditions such as water temperature and nutrient supply. The earth limits the application of microbial methods; the adsorption method can be used to treat dissolved oil in oil-water mixtures, remove oil droplets with a particle size of less than 10 μm, and the separated water quality is good, and the equipment occupies a small area, but the investment of adsorption equipment is high, and the regeneration of adsorbents is difficult. ;The chemical coagulation method can treat the emulsified oil in the oil water, and the oil droplet size is larger than 10μm. The oil water treatment of the chemical coagulation method is easy to operate and the technology is mature, but the equipment occupies a large area and needs to add a large amount of chemicals, which is easy to produce secondary pollution; electrolysis The method can deal with emulsified oil in oil and water, and the droplet size is greater than 10 μm. The electrolysis method has high degreasing efficiency and strong operation sustainability, but the energy consumption is high, the equipment is complicated, and electrolysis will produce explosive gas H 2 ;Membrane separation method uses the pore size of the membrane to intercept macromolecules, particles, colloids and other substances, and treat oil droplets with a particle size of 0.1nm to 10μm. The separation efficiency is high and the operation is simple, but its maintenance cost is high, thermal stability is poor and it is not corrosion resistant

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