Hydrodynamic Lubrication Analysis of Eccentric Bearing in Rotary Compressor

This paper numerically and experimentally analyzed mechanical loss of an eccentric bearing to improve mechanical efficiency of a rotary compressor. On the basis of dynamic analysis on eccentric bearing, the dynamic load of the eccentricity bearing was solved, and the lubrication of eccentric bearing was analyzed. The trajectory of the bearing was calculated to analyze the fluid dynamic lubrication of the bearing in order to find out which parts may be wear. The numerical results show that an eccentric bearing with cut off frictional surface gives higher mechanical efficiency than that of a normal eccentric bearing. The experimental results showed increase in coefficient of performance (COP) by 0.6% which correspond to the numerical results. In addition, to confirm the reliability of an eccentric bearing with cut off frictional surface, we did the reliability test under conditions of optimum shape. This paper concludes that an eccentric bearing with an optimum shape is effective for obtaining higher efficiency

Simple Aminated Modified Zeolite 4A Synthesized Using Fly Ash and Its Remediation of Mercury Contamination: Characteristics and Mechanism

In this study, through simple ammonia impregnation, more amine functional groups could be introduced into the zeolite 4A synthesized using fly ash, which efficiently improved the mercury ion removal capacity of modified zeolites. The impregnation-modification mechanism of NH3·H2O, ammonium chloride, and silane coupling agent (KH792) for zeolite 4A, and the Hg2+ ion removal-efficiency by aminated zeolites, were studied and compared. Through ion exchange and hydroxyl reactions, NH3·H2O impregnation introduced the same kinds of nitrogen-containing groups into zeolite as KH792 grafting, which was more than the NH4Cl modification. The Hg2+ ion adsorption capacity of NH3·H2O-zeolite was higher than those of KH792-zeolite and NH4Cl-zeolite through ion exchange and the complexation of nitrogen-containing groups. When coexisting with Pb2+, Cu2+, and Zn2+ ions, the Hg2+ ion removal rate of NH3·H2O-zeolite was still higher than 99%. After five adsorption and desorption cycles, the Hg2+ ion removal rate of NH3·H2O-zeolite was 72.03%. When NH3·H2O-zeolite was added to the leaching of mercury-contaminated soil, the content of soluble mercury significantly decreased. Therefore, we synthesized a potential cheap and safe adsorbent using fly ash as the main raw material through the simple NH3·H2O impregnation modification for the treatment of mercury-contaminated water and soil

Simple Aminated Modified Zeolite 4A Synthesized Using Fly Ash and Its Remediation of Mercury Contamination: Characteristics and Mechanism

In this study, through simple ammonia impregnation, more amine functional groups could be introduced into the zeolite 4A synthesized using fly ash, which efficiently improved the mercury ion removal capacity of modified zeolites. The impregnation-modification mechanism of NH3·H2O, ammonium chloride, and silane coupling agent (KH792) for zeolite 4A, and the Hg2+ ion removal-efficiency by aminated zeolites, were studied and compared. Through ion exchange and hydroxyl reactions, NH3·H2O impregnation introduced the same kinds of nitrogen-containing groups into zeolite as KH792 grafting, which was more than the NH4Cl modification. The Hg2+ ion adsorption capacity of NH3·H2O-zeolite was higher than those of KH792-zeolite and NH4Cl-zeolite through ion exchange and the complexation of nitrogen-containing groups. When coexisting with Pb2+, Cu2+, and Zn2+ ions, the Hg2+ ion removal rate of NH3·H2O-zeolite was still higher than 99%. After five adsorption and desorption cycles, the Hg2+ ion removal rate of NH3·H2O-zeolite was 72.03%. When NH3·H2O-zeolite was added to the leaching of mercury-contaminated soil, the content of soluble mercury significantly decreased. Therefore, we synthesized a potential cheap and safe adsorbent using fly ash as the main raw material through the simple NH3·H2O impregnation modification for the treatment of mercury-contaminated water and soil

Corrosion behaviours of a LaB6/TiC/TiB/ti composite in neutral or acidic electrolytes

LaB6/TiC/TiB was incorporated into a Ti–Al–Zr–Sn alloy to achieve an efficient improvement in acid-resistance. The incorporation of LaB6/TiC/TiB deteriorated the performance of the passive layer, but impeded the penetration of the corrosive medium into Ti matrix. The incorporation of the conductive reinforcements promoted galvanic corrosion, leading to a decrease in barrier effect of the passive film. Delayed passivation in less aggressive media was achieved by controlling the formation and growth of corrosion pits. The distribution of LaB6/TiC/TiB determined the corrosion properties after complete failure of the passive layer. An appropriate approach for enhancing the acid-resistance of Ti-based materials was suggested