Research On The Design And Performance Of Self-powered Triboelectric Dehydrator

With the development of modern industry,the use of petroleum and petroleum products has increased dramatically and has spread to all aspects of production and life.As the last link of crude oil production and purification,the electric dehydration technology in crude oil has the characteristics of high dewatering efficiency,deep dewatering,and no pollution,and it is also extremely excellent from the perspective of energy utilization.However,with major oil fields entering the high moisture content extraction stage,short circuits and electric field maintenance failures caused by water chains frequently occur in the process of crude oil electric dewatering,which degrades the dewatering effect and even damages the dehydrator and endangers the safety of operators.The advent of Triboelectric Nanogenerator(TENG)provides a new solution to the drawbacks of electric dewatering.TENG is a new type of power generation method with high voltage and low current output,which is expected to solve the problem of high moisture content emulsions treated by electric dehydrator and thus break through the moisture content limit of traditional electric dehydrator.Therefore,this thesis innovatively combines triboelectric nanogenerator with electric dehydration technology and designs a new type of triboelectric dehydrator(TED).The main research contents and conclusions of this thesis are as follows:Firstly,this thesis combines the power generation principle of freestanding triboelectriclayer mode triboelectric nanogenerator and the principle of electric dehydration to design a selfpowered triboelectric dehydrator using ambient energy,which consists of a rotating freestanding-rotary triboelectric nanogenerator(FR-TENG)directly connected to the different electrodes form of the separators.Immediately afterward,simulations of the potential and electric field distribution of the separator with different electrode forms are performed.Next,the output performance of FR-TENG is tested and it is determined that its output voltage can satisfy the requirements of electric dehydration and can maintain the short-circuit current at the microampere level.This will help to solve the short circuit and electric field maintenance failure caused by the water chain.On top of that,microscopic experiments and observations of the motion characteristics of water droplets in oil under the alternating electric field generated by FR-TENG are carried out in conjunction with the principle of electric dehydration under different electric field forms,and the motion law of water droplets in emulsion under this electric field is summarized.Subsequently,a triboelectric dehydration experimental platform is built.The four factors of electric field strength,electric field uniformity,continuous phase viscosity,and initial moisture content,which affect the electric dehydration effect,are first experimentally investigated to verify the simulation results for separators with different electrode forms.The experimental results show that the electric field strength and continuous phase viscosity have a great influence on the electric dehydration effect,the effect of parallel electrode separator is generally higher than that of wire-duct electrode separator.The dehydration rate of emulsion with higher moisture content is also higher.Finally,the effect of triboelectric dehydration on water-in-oil emulsion with high moisture content is investigated under the derived optimal experimental conditions.The experimental results show that the triboelectric dehydrator can effectively treat water-in-oil emulsions with moisture content up to 60%,and the applicable moisture content range is more than twice that of the conventional AC electric dehydrator.This thesis conducts experiments on wind-driven triboelectric dehydration.The results show that the triboelectric dehydrator can indeed achieve self-powered treatment of water-in-oil emulsion with high moisture content by collecting environmental energy.