The Research of Compressor Oil Used on Filling Supercritical Sulfur Dioxide

2013 ◽  
Vol 664 ◽  
pp. 789-794
Author(s):  
Zhao Xia Lu ◽  
Zong Yi Tian ◽  
You Cheng Xiao ◽  
Sheng Li ◽  
Cai Zhen Tang ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Working Conditions ◽  
Sulphur Dioxide ◽  
Supercritical Condition ◽  
It Use ◽  
Base Oil ◽  
Performance Requirements ◽  
Lubrication Performance ◽  
Dioctyl Sebacate

According to compressor working conditions and compressor lubrication performance requirements in this paper. It use a polyether and dioctyl sebacate as the base oil, and adding a variety of functions of composite additive deployment, Develop a kind of a compressor oil used on compressing and filling sulphur dioxide (SO2) in the supercritical condition. Experiments show that the developed compressor oil not only meets the performance requirements of compress and filling SO2 in supercritical condition, but also has a very strong adaptability condition.

Optimization of Working Conditions by Response Surface Methodology of Sulfur Dioxide Gas Sensors Based on Au/CoO‐2La 2 WO 6 Nanoparticles

2020 ◽  
Vol 5 (36) ◽  
pp. 11145-11151
Author(s):  
Fuxiu Yang ◽  
Wenjuan Zhang ◽  
Youxi Zhao ◽  
Yizhi Ji ◽  
Baining Liu ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Sulfur Dioxide ◽  
Response Surface ◽  
Working Conditions ◽  
Gas Sensors

Purification Route of Pyrite from Coal Mining

2016 ◽  
Vol 869 ◽  
pp. 155-158
Author(s):  
Camila Machado de Oliveira ◽  
Adilson Oliveira ◽  
Jeane Almeida do Rosário ◽  
Agenor de Noni Jr. ◽  
Michael Peterson
Keyword(s):  
Solar Cells ◽  
Organic Solvent ◽  
Solid Waste ◽  
Coal Mining ◽  
Sulphuric Acid ◽  
Sulphur Dioxide ◽  
Hot Water ◽  
Soluble Salts ◽  
It Use ◽  
Purity Level

Pyrite, mineral largely found in nature, is considered a solid waste when is obtained from the coal mining. However, can be precursor of products like: sulphur, sulphuric acid, hematite, sulphur dioxide, fertilizers and iron sulfates. Several studies also point it property of semiconduction and it use in solar cells. Increase it purity level is important for transforming it in products with more aggregate value. Thus, the present work suggests a purification route for the reduction in soluble salts in water, organics and quartz associated with pyrite from the coal mining beneficiation. The used methods were solubilization in hot water and in organic solvent (dichloromethane). Were applied XRD, FTIR, total sulphur determination, and gas helium picnometry. Comparing the results obtained for the “in nature” pyrite with the purified one, proved the efficiency of the proposed method.

Temperature of Grinding Carbide with Castor Oil-based MoS2 Nanofluid Minimum Quantity Lubrication

2021 ◽  
pp. 1-30
Author(s):  
Menghua Sui ◽  
Changhe Li ◽  
Wentao Wu ◽  
Min Yang ◽  
Hafiz Muhammad Ali ◽  
...  
Keyword(s):  
Working Conditions ◽  
Minimum Quantity Lubrication ◽  
Grinding Force ◽  
Cemented Carbide ◽  
Machining Process ◽  
Minimum Quantity ◽  
Lubrication Performance ◽  
Nanofluid Minimum Quantity Lubrication ◽  
G Ratio ◽  
Specific Grinding Force

Abstract Nanofluid minimum quantity lubrication (NMQL) has better stability, higher thermal conductivity, and excellent lubrication performance compared with traditional flood lubrication. The heat transfer model and finite difference model were established to verify the feasibility of NMQL conditions in grinding cemented carbide. Based on them, the grinding temperature of cemented carbide is calculated numerically. Results show that the grinding zone temperatures of flood grinding and NMQL are lower, 85.9 °C and 143.2 °C, respectively. Surface grinding experiments of cemented carbide YG8 under different working conditions are carried out. Dry grinding (227.2 °C) is used as the control group. Grinding zone temperatures of flood grinding, minimum quantity lubrication, and NMQL decrease by 64.2%, 39.5%, and 20.4% respectively. The error is 6.3% between theoretical calculation temperature and experimental measurement temperature. Based on machining process parameters (specific grinding force, force ratio) and experimental results (microstructure of grinding wheel, workpiece, and grinding debris), the effects of different working conditions on wheel wear are studied. NMQL achieves the highest G ratio of 6.45, the smallest specific grinding force, and the smallest Fn/Ft ratio of 2.84, which further proves that NMQL is suitable for grinding cemented carbide.

scholarly journals Nanodiamond Particles as Secondary Additive for Polyalphaolefin Oil Lubrication of Steel–Aluminium Contact

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1438
Author(s):  
Ankush Raina ◽  
Mir Irfan Ul Haq ◽  
Ankush Anand ◽  
Sanjay Mohan ◽  
Rajiv Kumar ◽  
...  
Keyword(s):  
Coefficient Of Friction ◽  
Hexagonal Boron Nitride ◽  
Normal Load ◽  
Lubricant Additive ◽  
Oil Lubrication ◽  
Volumetric Wear ◽  
Base Oil ◽  
Applied Normal Load ◽  
Lubrication Performance ◽  
The Coefficient Of Friction

Nanodiamond (ND) particles are effective lubricant additives. Attention of research has shifted towards investigating the particles as secondary additives. ND particles provide more benefits as secondary additives than as the sole lubricant additive for steel–steel contacts. In this work, the influence of ND particles as secondary additives on oil lubrication of steel–aluminium tribopair (hard–soft contact) was examined. AISI 52100 steel balls were slid against AA2024 aluminium alloy discs, in the presence of polyalphaolefin (PAO) base oil, in boundary lubrication regime (applied normal load: 10 N to 50 N). Primary additives were copper oxide (CuO) and hexagonal boron nitride (h-BN) nanoparticles. The addition of ND particles to PAO, with CuO and h-BN as primary additives, at the lowest applied normal load of 10 N: (i) decreased the volumetric wear of the aluminium discs by 28% and 63%, respectively, and (ii) decreased the coefficient of friction by 15% and 33%, respectively. At the highest applied normal load of 50 N, it: (i) decreased the volumetric wear of the aluminium discs by 20% and 38%, respectively, and (ii) decreased the coefficient of friction by 5.4% and 8%, respectively. ND particles as secondary additives significantly reduce energy loss and power loss as a consequence of an effective reduction in friction during sliding. Unique characteristics of ND particles—such as their (a) physicochemical and thermal properties, (b) ball bearing and polishing effects and (c) synergistic interaction with primary additives to form stable tribofilms—enhance the lubrication performance of steel–aluminium contact. ND particles in combination with h-BN nanoparticles showed the best performance, due to better synergy between the primary additive and the secondary additive. Results from the investigation indicate that ND particles taken as secondary additives in small amount (0.2 wt%) can improve oil lubrication performance of hard–soft contacts in engineering systems.

scholarly journals OCCUPATIONAL HYGIENE AND HEALTH OF WORKERS EMPLOYED IN THE PROCESSING OF NATURAL GAS

2019 ◽  
Vol 96 (6) ◽  
pp. 541-548
Author(s):  
V. I. Boiko ◽  
Yu. I. Dotsenko ◽  
A. Kh. Akhmineeva ◽  
Oksana V. Boiko
Keyword(s):  
Hydrogen Sulfide ◽  
Sulfur Dioxide ◽  
Natural Gas ◽  
Environmental Protection ◽  
Working Conditions ◽  
Raw Materials ◽  
Elevated Pressure ◽  
Physical And Mental Health ◽  
Scientific Center ◽  
Harmful Substances

This review in chronological order considers steps of the solution of the one of key issues of occupational medicine, namely - a hygienic assessment of working conditions at enterprises of gas-processing industry - the most steadily growing sector of economy, reliably providing the population’s needs and the national economy for fuel and energy resources. The intensity of the working process at these enterprises was shown to be often associated with the persistent exposure to various harmful factors of the occupational environment that in the complex promotes the formation of unfavorable functional states, a decline in the level of physical and mental health, productivity and efficiency of work. Industrial air environment in services workshop and compressor houses is often polluted with hydrogen sulphide, sulfur dioxide, mercaptans, methanol, saturated and unsaturated hydrocarbons, nitrogen and carbon oxides. The main cause of this pollution is a certain imperfection of the technological process and equipment, especially the lack of its tightness. The number of processes at a high temperature and elevated pressure in the presence of very aggressive reagents primarily, as hydrogen sulfide and sulfur dioxide promotes the release of harmful substances into air environment. The possibility of their additive or synergistic impact on employees is not excluded because just in such industries there is seen a number of combinations of harmful substances enforcing the action of each other. There is made a conclusion that working conditions and environmental protection at the enterprises for the processing of natural gas and condensate with the high content of hydrogen sulfide and other corrosive components need for the further comprehensive hygienic assessment with the aim of the development of measures for the improvement of working conditions, preservation of workers’ health and environmental protection at all stages of production and processing of hydrocarbon raw materials in modern conditions. In preparing the review, the Scopus and Russian Information Scientific Center databases were used.

scholarly journals The kinetics and mechanism of the sulfur dioxide oxidation by the oxygen in the presence of the cobalt and nickel complexes, fixed on polymer matrix

2016 ◽  
Vol 1 (1) ◽  
pp. 65
Author(s):  
V.S. Emelyanova ◽  
K.A. Zhubanov ◽  
T.V. Shakieva ◽  
G.A. Yuldasheva
Keyword(s):  
Sulfur Dioxide ◽  
Quantum Chemical Calculations ◽  
Polymer Matrix ◽  
Sulphur Dioxide ◽  
Quantum Chemical ◽  
Nickel Complexes ◽  
Uv Spectra ◽  
Kinetics Study ◽  
Sphere Mechanism ◽  
Cobalt And Nickel

<p>Catalytic sulphur dioxide oxidation by oxygen on the cobalt and nickel complexes fixed on polyetheleneamine was investigated. On the base of kinetics study it was established that SO<sub>2</sub> and oxygen interact in inner sphere mechanism. UV-spectra and quantum-chemical calculations are presented, and on the base of them the ways of oxygen activation are discussed.</p>

Tribological assessment of vegetable oil based CeO2/CuO hybrid nano-lubricant

2020 ◽  
Vol 234 (12) ◽  
pp. 1940-1956
Author(s):  
Ayamannil Sajeeb ◽  
Perikinalil K Rajendrakumar
Keyword(s):  
Friction Coefficient ◽  
Vegetable Oil ◽  
Oxidation Stability ◽  
Coconut Oil ◽  
Nano Particles ◽  
Wear Scar Diameter ◽  
Base Oil ◽  
Lubrication Performance ◽  
Nano Lubricant ◽  
Worn Surface

Vegetable oil based lubricants attract much attention nowadays due to their excellent boundary lubrication performance and biodegradability. Coconut oil is a vegetable oil with excellent lubricating properties which provides low friction coefficient and better oxidation stability. The purpose of this study is to investigate the performance of coconut oil based new hybrid CeO2/CuO nano-lubricant with various ratios of CeO2/CuO viz. 25/75, 50/50, and 75/25 at different concentrations (0.1, 0.25, 0.5, and 1.0 wt%). The rheological, thermal, thermo-gravimetric, and tribological evaluations were conducted for hybrid nano-lubricants and the results were compared with those of base oil (coconut oil) and nano-lubricants containing CeO2 and CuO nano-particles individually. A reduction of 15.7% in average friction coefficient and 23.4% in wear scar diameter was observed with the use of 0.25 wt% CeO2/CuO: 50/50 hybrid. Oil degradation studies and worn surface analyses after engine test were also done. The results showed that the surface enhancement is evidenced with the use of hybrid nano-lubricant.

Effects of Working Conditions on TEHL Performance of a Helical Gear Pair With Non-Newtonian Fluids

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Mingyong Liu ◽  
Caichao Zhu ◽  
Huaiju Liu ◽  
Huafeng Ding ◽  
Zhangdong Sun
Keyword(s):  
Working Conditions ◽  
Power Law ◽  
Elastohydrodynamic Lubrication ◽  
Helical Gear ◽  
Gear Pair ◽  
Power Law Fluid ◽  
Finite Line Contact ◽  
Lubrication Performance ◽  
Finite Line ◽  
Helical Gear Pair

A thermal elastohydrodynamic lubrication (TEHL) finite line contact model is developed for a helical gear pair lubricated with an Eyring fluid or a power-law fluid in order to investigate the effects of the working conditions. A lubrication analysis within a meshing period shows that the differences between the Eyring and Newtonian solutions mainly lie in the film temperature and the shear stress. For the power-law fluid, the power index n has a significant effect on the film thickness. The effects of load and speed on lubrication performance along the line of action are discussed.

Analysis of tilting-pad thrust bearing static instability and lubrication performance under the bistability

2014 ◽  
Vol 66 (5) ◽  
pp. 584-592 ◽  
Author(s):  
Ouyang Wu ◽  
Yuan Xiaoyang ◽  
Jia Qian
Keyword(s):  
Working Conditions ◽  
Thrust Bearing ◽  
Equilibrium Points ◽  
Static Equilibrium ◽  
Distribution Area ◽  
Acceptance Test ◽  
Content Type ◽  
Lubrication Performance ◽  
Tilting Pad ◽  
Static Instability

Purpose – The purpose of this paper is to analyze the problems of tilting-pad thrust bearing static instability and lubrication performance under static bistability. Design/methodology/approach – The static equilibrium state of tilting-pad thrust bearing is analyzed, and key parameters are extracted from the general lubrication model. Then, a distribution area of bearing static equilibrium points is achieved by solving the model. The area is divided into three sub-areas which represent monostabillity, bistability and instability, and an unstable boundary of the area is discovered. By these findings, a reversible lubrication failure phenomenon is explained. A calculation method is proposed to obtain bearing lubrication performance under the bistability. Findings – The variation of working conditions can lead to migration of unstable boundary and static instability. After resuming the working conditions, unstable boundary will resume in situ, and the bearing will operate steadily again. Moreover, there is a big difference between the two groups of lubrication performance solutions under the bistability. Practical implications – The static stability acceptance test of tilting-pad thrust bearing should be implemented under start–stop, accidental excitation and other conditions before service to prevent such lubrication failure phenomenon. Moreover, fulcrum position of the bearing pad should be kept away from the bistable area. Originality/value – This paper has preliminarily revealed a static instability mechanism of tilting-pad thrust bearing, analyzed bistability lubrication performance and proposed some suggestions to improve the bearing stability.

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