Performance Study Of Negative Air Ion Generator Driven By Wind Energy Triboelectric Nanogenerator

People spend most of their day indoors,indoor pollutants have a direct impact on human health,among them,particulate matter（PM）is not only harmful to physical health,but also has a negative impact on mental health,so it is important to reduce the concentration of indoor particulate matter.Particulate matter purification technologies currently used in indoor ventilation systems are water purification,filtration,electrostatic dust removal and negative ion purification.Various purification technologies have the disadvantages,among which the negative ion purification technology has less wind resistance,also in the removal of particulate matter at the same time to achieve sterilization,the negative ions generated can also have a positive impact on human health,but there are also electrical wiring and complex equipment problems.In summary,how to reduce energy consumption,reduce wind resistance is the key to the current study of air purification technology.The Triboelectric Nanogenerator（TENG）can effectively harvest environmental energy and convert mechanical energy into electrical energy.In this thesis,a Wind Energy Triboelectric Nanogenerator（WE-TENG）is innovatively proposed to capture the wind energy by vertical axis resistance type blades to rotate the rotor,which can collect mechanical wind energy in indoor air ducts and convert it into electrical energy output.The WE-TENG is connected to a power management circuit（PMC）and a negative air ion（NAI）generator to generate negative ions from the negative ion releasing electrode,which can precipitate suspended particles to achieve self-powered air purification.The self-powered air purification device proposed in this thesis is characterized by self-powered and relatively low wind resistance,and the generated negative ions can also have a positive impact on human health.In this thesis,the performance of WE-TENG and the purification performance of NAI generator are studied systematically,the main research contents and conclusions are as follows:（1）In this thesis,the relationship between air flow velocity and WE-TENG speed when WE-TENG is applied in low-speed air ducts is experimentally explored,and the power output of WE-TENG at different wind speeds is explored.The results show that the speed of WE-TENG increases as the wind speed increases,specifically,WE-TENG can start at 1.5 m/s wind speed.And reaches 1300 rpm at a wind speed of 5.5 m/s.For the study of output performance,when the speed increases,the short-circuit current of WE-TENG increases,and the open-circuit voltage of WE-TENG and transferred charge both increase first and then level off.（2）The WE-TENG outputs AC power and requires circuit management to output negative DC power to enable the subsequent NAI generator to generate negative ions in a stable and efficient manner.In this thesis,four different types of power management circuits are used:PMC-Ⅰis the full wave rectifier circuit,PMC-Ⅱis the Villard circuit with C_TENG,PMC-III is the Villard circuit,and PMC-IV is the voltage doubler.The results show that PMC-III and PMC-IV have the best output performance,specifically,PMC-III has the highest peak voltage and PMC-IV can output relatively stable high voltage,so further practical application experiments are needed to compare and analyze these two circuits.（3）Based on the connection of WE-TENG to PMC-III and PMC-IV,respectively,the performance of NAI generators with negative ion release electrodes of the tungsten-alloy,needle,and carbon-fiber electrodes is explored.The experiment mainly analyzes the negative ion generation rate of different types of negative ion release electrodes,and concludes that the carbon fiber electrode performs optimally.Based on the carbon fiber electrode,the negative ion generation of PMC-III and PMC-IV were compared horizontally,and it was concluded that the performance of PMC-IV was relatively better.（4）The power supply capability of WE-TENG and the dust removal capability of the purification module were demonstrated.The WE-TENG can light up 100 LEDs simultaneously.At a fixed speed,a single carbon fiber brush can operate for 80 s to decontaminate a cylindrical container with a diameter of 150 mm and a height of 300 mm.The experiments also compared the dust removal efficiency of 1,11 and 21 carbon fiber electrodes and showed that the higher the number of carbon fiber electrodes the better the dust removal,but the improvement of air cleaning capacity was relatively small when 11 or 21 carbon fiber electrodes were used.（5）The pressure drop of the self-powered NAI generator was measured by measuring the wind resistance at different face velocities,and the pressure drop of the self-powered NAI generator increased as the face velocity increased.The data also compared the pressure drop of the filtration equipment and the electrostatic precipitator and concluded that the self-powered NAI generator has the characteristic of low wind resistance.In summary,the WE-TENG researched in this thesis can effectively utilize the wind energy of air ducts to achieve low wind resistance self-powered air purification in air ducts,further promote the combination of TENG and air purification,and promote the development of self-powered air purification.