Influence of Back Electrostatic Field on the Collection Efficiency of an Electrostatic Lunar Dust Collector

The deposition of lunar dust on the surface of solar panels and optical elements is one of the most important problems need to be solved in lunar exploration. This paper will propose an initiative lunar dust removal system based on the photovoltaic effect of PbLaZrTi (PLZT), which is activated by the ultraviolet light extracted from sun light at the lunar surface. When ultraviolet light with a wavelength near 365nm illuminates on polarized PLZT materials, high voltages of several kilovolt per centimeter can be generated between two electrodes of PLZT. When two electrodes of PLZT are connected to a lunar dust collector (LDC) and the ITO film of protected surface respectively, an electrostatic field forms between LDC and the protected surface. Coulomb forces over particles will overcome gravitational force and surface forces, so the particles can be absorbed to LDC and removed by LDC finally. Based on the equivalent electrical model, mathematical model of electrostatic force is derived when the lunar removal electric field is acted either by single piece PLZT or by multi-pieces PLZT which are connected in parallel. Experimental platform is set up to prove the feasibility of this lunar dust removal system. In order to improve the removal efficiency, a novel configuration design of LDC based on multi-PLZT patched is proposed and its removal efficiency is evaluated by experiments.

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Dust emissions’ reduction into the atmosphere by environmental-engineering systems of smallsize devices with counter-swirling flows (CSF)

E3S Web of Conferences ◽

10.1051/e3sconf/201913801037 ◽

2019 ◽

Vol 138 ◽

pp. 01037

Author(s):

N.M. Sergina ◽

A.A. Sakharova ◽

V.N. Azarov ◽

D.V. Azarov ◽

M.A. Nikolenko

Keyword(s):

Collection Efficiency ◽

Swirling Flows ◽

Environmental Engineering ◽

Emissions Reduction ◽

Dust Collector ◽

Engineering Systems ◽

Collection System ◽

Dust Collection ◽

Dust Emissions ◽

Dust Collection Efficiency

The article discusses the features of using environmentalengineering systems of small-size devices with counter-swirling flows (CSF) to reduce dust emissions into the atmosphere. The reasons for the decrease of the dust collection efficiency by CSF systems are analyzed. The layout diagram of the dust collection system with CSF devices and the organization of suction from the dust collector hopper are given.

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Effect of Funnel Shape of Outlet Pipe about Collection Efficiency of Axial Flow Cyclone Dust Collector with Fixed Guide Vanes

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2000.1.0_739 ◽

2000 ◽

Vol 2000.1 (0) ◽

pp. 739-740

Author(s):

Masaru ARAKAWA ◽

Makoto KOBAYASHI ◽

Tsuyoshi IGARI ◽

Akira OGAWA

Keyword(s):

Collection Efficiency ◽

Axial Flow ◽

Dust Collector ◽

Guide Vanes ◽

Cyclone Dust Collector ◽

Outlet Pipe ◽

Axial Flow Cyclone

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Study of dust collection effectiveness in cyclonic-vortex action apparatus

Technology audit and production reserves ◽

10.15587/2706-5448.2021.225328 ◽

2021 ◽

Vol 1 (3(57)) ◽

pp. 21-25

Author(s):

Andrei Torsky ◽

Alexander Volnenko ◽

Leonid Plyatsuk ◽

Larysa Hurets ◽

Daulet Zhumadullayev ◽

...

Keyword(s):

Turbulent Diffusion ◽

Particle Deposition ◽

High Efficiency ◽

Collection Efficiency ◽

Dust Collector ◽

Fine Dust ◽

Dust Collection ◽

Contact Stage ◽

Fractional Efficiency ◽

Overall Efficiency

The object of research is the efficiency of dust collection of fine dust in an apparatus with an intense turbulent mode of phase interaction. One of the most problematic areas of the existing dust and gas cleaning equipment is the low efficiency of collecting fine dust. Effective cleaning of exhaust gases from dust involves the use of multi-stage cleaning systems, including wet and dry dust cleaning devices, which entails high capital and operating costs. These disadvantages are eliminated in the developed design of the cyclone-vortex dust collector with two contact zones. The device implements both dry and wet dust collection mechanisms, which allows for high efficiency of dust removal at high productivity. The conducted studies of the total and fractional efficiency of dust collection when changing the operating parameters of the developed device showed that the efficiency of collecting fine dust is 98–99 %. The increase in the efficiency of dust collection in the dry stage of the device is due to an increase in centrifugal force. In the wet stage of contact, the efficiency reaches its maximum values due to the vortex crushing of the liquid in the nozzle zone of the apparatus. Studies of the fractional efficiency of the apparatus show that with an increase in the diameter of the captured particles, the efficiency of the dust collection process for dry and wet stages, as well as the overall efficiency, increases. With an increase in the density of irrigation, the overall efficiency of dust collection in the apparatus increases. It has been established that an increase in the efficiency of capturing highly dispersed particles occurs due to turbulent diffusion, the value of which is determined by the frequency of turbulent pulsations and the degree of entrainment of particles during the pulsating motion of packed bodies. To describe the results obtained, a centrifugal-inertial model for a dry contact stage and a turbulent-diffusion model of solid particle deposition for a wet contact stage are proposed, which make it possible to calculate the dust collection efficiency of the contact stages, as well as the overall efficiency of the cyclone-vortex apparatus. The results obtained show the prospects of using devices of this design at heat power plants and other industries.

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