A method for improving the coalescence efficiency of emulsified oil droplets induced by pulsed electric field
A technology of pulsed electric field and emulsified oil, which is applied in the direction of electric liquid separation and immiscible liquid separation, etc. It can solve the problems of not being able to adapt to the influence of particle size changes and slow particle size changes, and achieve superior results, improve agglomeration, and quickly The effect of agglomeration promotion
Inactive Publication Date: 2016-08-17
CHONGQING UNIV OF TECH
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Problems solved by technology
However, under the action of continuous pulsed electric field, the droplet size in the emulsified oil began to increase rapidly, but then the particle size changed slowly
The particle size change will have an important impact on the force of the droplet in the electric field, and also affect the coalescence electric field conditions. Therefore, the constant frequency pulse demulsification electric field obviously cannot adapt to the impact of the particle size change on it, and there are limitations
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[0018] The method for improving the coalescence efficiency of emulsified oil droplets induced by a pulsed electric field in the present invention adopts the method of changing the frequency of the pulsed electric field instead of the constant frequency method. There are two technical parameters that need to be determined: (1) the time interval for changing the frequency of the electric field. (2) The value of the changing electric field frequency.
[0019] 1. Time interval of changing electric field frequency
[0020] According to the influence of the application time of the electric field on the radius of the water droplet in oil, it is concluded that the radius of the water droplet increases with the increase of the application time of the electric field until it reaches the maximum radius. An emulsified oil system consists of coalescing from N water droplets with radius R to 0.5N water droplets with radius 2 1 / 3 The evolution time of the water droplet of R is determined by...
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The invention discloses a method for improving pulsed electric field induction emulsified oil liquid drop coalescing efficiency. According to the method for improving the pulsed electric field induction emulsified oil liquid drop coalescing efficiency, demulsification is performed by the exertion of a pulsed electric field with constant electric field intensity on emulsified oil, the frequency of the pulsed electric field is variable frequency, the time of electric field exerting under each frequency is the same, the time is called as a time interval of electric field frequency changing, and after each frequency pulsed electric field is exerted for the time, the next frequency pulsed electric field is exerted. According to the method for improving the pulsed electric field induction emulsified oil liquid drop coalescing efficiency, the influence on the electric field coalescing efficiency caused by the change of grain sizes of liquid drops is taken into consideration, the method is adapted to the liquid drop dynamic change, and the emulsified oil liquid drop coalescing efficiency can be effectively improved. The variable-frequency pulsed electric field better accords with the influence on the coalescing efficiency caused by the continuous increase of liquid drops, and quick coalescing and largening of the liquid drops are obviously facilitated.
Description
technical field [0001] The invention relates to the coalescence of emulsified oil droplets, in particular to a method for improving the coalescence efficiency of emulsified oil droplets induced by a pulse electric field, and belongs to the technical field of coalescence of emulsified oil droplets. Background technique [0002] Demulsification is the process of aggregating the small droplets of the dispersed phase of the emulsion into agglomerates to form large droplets, and finally separating the oil-water two-phase. Among them, electric field demulsification is a more common method. At present, pulsed electric field demulsification mainly uses constant frequency pulses to act on emulsified oil. However, under the action of continuous pulsed electric field, the droplet size in emulsified oil increases rapidly at first, but then the particle size changes slowly. The particle size change will have an important impact on the force of the droplet in the electric field, and als...
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IPC IPC(8): B01D17/04B01D17/06
Inventor 龚海峰彭烨尚浩浩
Owner CHONGQING UNIV OF TECH