scholarly journals High Efficiency Cyclone Filters for Decontamination of Dust and Gas Emissions

10.12737/5304 ◽  
2014 ◽  
Vol 3 (4) ◽  
pp. 51-54
Author(s):  
Каргашилов ◽  
D. Kargashilov ◽  
Романюк ◽  
E. Romanyuk ◽  
Некрасов ◽  
...  

The article studies the new construction of cyclone and the results of its testing, which confirm higher efficiency of air decontamination and lower hydraulic resistance. Operation process of the cyclone and methods of its geometric parameters’ calculation are provided.

2009 ◽  
Vol 2009 (8) ◽  
pp. 473-477 ◽  
Author(s):  
Xinying Zhang ◽  
Yingying Qu ◽  
Xuesen Fan ◽  
Xia Wang ◽  
Jianji Wang

The utilisation of an ionic liquid-[bmim][BF4] as both reaction medium and promoter for the reaction between aldehyde and 4-hydroxy-6-methylpyran-2-one is described. Without any added catalyst, this reaction was realised efficiently to give arylbispyranylmethane derivatives in high yields. Alternatively, when this reaction was carried out in the presence of acetic anhydride, fused pyran derivatives were obtained. These two novel procedures have advantages such as an environmentally benign nature, high efficiency, simple operation process and mild reaction conditions. As an application, these procedures were used in the preparation of novel 5-substituted pyrimidine nucleoside derivatives with potential antiviral activities.


Micromachines ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 584
Author(s):  
Inna Levitsky ◽  
Dorith Tavor

Atomization of liquid media is a key aim in various technological disciplines, and solutions that improve spray performance, while decreasing energy consumption, are in great demand. That concept is very important in the development of liquid fuel spray atomizers in high-efficiency microturbines and other generator systems with low inlet pressure and a wide range of power supply. Here we present a study of the liquid atomization characteristics for a new mechanical atomizer that has optimal geometric parameters and a preliminary swirl stage. In our air-assisted atomizer, air is introduced through a swirl chamber positioned at the exit of the mechanical atomizer. The optimized mechanical atomizer alone can achieve D32 drop diameters in the range of 80 to 40 µm at water supply pressures of 2 to 5 bar, respectively. The addition of an air swirl chamber substantially decreases drop sizes. At an air–liquid ratio (ALR) equal to 1, water pressures of 2.5 to 3 bar and air supply pressures 0.35 to 1 bar, D32 drops with diameters of 20–30 µm were obtained. In an air-assisted atomizer the parameters of the mechanical atomizer have a much stronger influence on drop diameters than do characteristics of the air-swirl chamber. Using a mechanical atomizer with optimal geometrical dimensions allows limiting the liquid supply pressure to 5 bar; but when an air-assisted component is introduced we can recommend an ALR ≈ 1 and an air supply pressure of up to 1 bar.


2013 ◽  
Vol 421 ◽  
pp. 453-458
Author(s):  
Wei Liu ◽  
Zhen Yuan Jia ◽  
Ming Xing Li ◽  
Yang Liu ◽  
Yang Zhang

t is difficult to obtain high measurement accuracy in online detecting the thermal geometric parameters of hot large forgings, based on machine vision method. In this paper, firstly, a spectrum selective image acquisition method for high-temperature components is proposed, which can successfully reduced the effect of high temperature on image quality. Then, a measurement method based on the coding feature lines for geometric parameters of hot large forgings is employed, which can effectively improve the extraction efficiency of geometry characteristic information of high-temperature components. Experiments on the forging workshop show that measurement accuracy of diameters for cylindrical forging reaches 0.2% and the measurement time is 2.25 seconds; measurement accuracy of lengths for cuboid forging reaches 0.48% and the measurement time is 5.9 seconds. The experimental results have verified the feasibility and high efficiency of the proposed method for measuring the geometric parameters of hot large forgings.


2020 ◽  
pp. 4-11
Author(s):  
A. G. Sokolova ◽  
F. Ya. Balitsky ◽  
V. D. Sizarev

The paper presents the results of the specific vibration condition monitoring approach for maintenance of unique critical equipment provided complete access impossibility to its components (due to radiation environment) throughout the entire operation period. The approach bases on the previously proposed S-discriminants of vibrations which are calculated with adaptation to the reference state of the equipment. The method showed its high efficiency in detecting the moment of machine operation process imbalance and in tracking the equipment components degradation, starting from the earliest stage. It is illustrated on the example of the movable neutron reflector PO-3 of the IBR-2 research reactor that it is possible not only to detect in time the moment when a fault occurs, but also to make a preliminary express diagnosis of its condition.


2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Jui-Yung Chang ◽  
Hao Wang ◽  
Liping Wang

The present study focuses on nanowire-based metamaterials selective solar absorbers. Finite-difference time-domain (FDTD) simulation is employed for numerically designing a broadband solar absorber made of lossy tungsten nanowires which exhibit spectral selectivity due to the excitation of magnetic polariton (MP). An inductor–capacitor circuit model of the nanowire array is developed in order to predict the resonance wavelengths of the MP harmonic modes. The effects of geometric parameters such as nanowire diameter, height, and array period are investigated and understood by the sweep of geometric parameters, which tunes the MP resonance and the resulting optical and radiative properties. In addition, the optical properties and conversion efficiency of this nanowire-based absorber are both demonstrated to be insensitive on incidence angles, which illustrates the potential applicability of the proposed nanowire-based metamaterial as a high-efficiency wide-angle selective solar absorber. The results show that the nanowire-based selective solar absorber with base geometric parameters can reach 83.6% of conversion efficiency with low independence of incident angle. The results will facilitate the design of novel low-cost and high-efficiency materials for enhancing solar thermal energy harvesting and conversion.


Author(s):  
Xuanyu Wang ◽  
Mengyang Fan ◽  
Yayu Guan ◽  
Yuyu Liu ◽  
Minmin Liu ◽  
...  

Electroreduction of CO2 to produce chemicals and fuels is recognized as a promising technology to reduce greenhouse gas emissions, especially by using renewable energy. In doing so, it is possible...


2021 ◽  
Vol 25 (2) ◽  
pp. 73-96
Author(s):  
عبد الجليل علي العبيدي

Hospital buildings consume high energy more than other buildings in the commercial buildings sector as there is a continuous demand for power  supplies. Energy consumption and greenhouse gas emissions can be reduced in the buildings sector by using various energy saving methods. In this study, on-sight visiting for energy audit has been conducted at a private hospital in Sana’a - Yemen to record all data relevant to energy consumption by equipment, machines, and all other mechanical systems. Different energy saving scenarios were using to estimate the potential of energy saving such as using high-efficiency lighting devices, raising the thermostat set point temperature for air conditioners, using high-efficiency motors (HEM) with a different load ratio, and using variable speed motors (VSM). Results indicated that energy consumption for the hospital was 4,061.8 Megawatthourper year whereas energy intensity was 232 kWh/m2. It is found that about 150.32 megawatt-hours of annual energy saving is achieved by using HEM and 689.72 Megawatt-hour per year by raising the set point of air conditioners thermostat to 26 °C. In addition, 1513 megawatt-hours per year of energy can be saved by reducing the VSM speed to 60% whereas95.8 megawatt-hours per year is estimated by adopting 100% load of HEM. The economic study of energy saving strategies was found that the use of HEM is not economically viable, while the use of VSM with large capacity motors is better from economic and environmental points of view. Keywords: Hospital building, energy consumption, Energy index, Energy saving, Emission reduction


Author(s):  
Mingshan Chi ◽  
Yaxin Liu ◽  
Yufeng Yao ◽  
Yan Liu ◽  
Shouqiang Li ◽  
...  

AbstractTo offer simple and convenient assistance for the elderly and disabled, researchers focus on programming by demonstration approach to improve the intelligence and adaptability of wheelchair mounted robotic arm assistive robot. But how to easily and quickly obtain the demonstration information is still an urgent problem to be solved. Based on the systematic analysis of the daily living tasks in need of robot assistance, this paper proposes the key-point-based programming by demonstration recording approach to quickly obtain the demonstration information and develops a specified demonstration interface to simplify the operation process. A corresponding evaluation approach is also proposed from the demonstration trajectories and demonstration process two aspects. Additionally, tasks of “holding water glass task”, “eating task”, and “opening door task” are carried out and experimental results, as well as comparative evaluations confirm the validity of the proposed approach with high efficiency. This study can not only offer a convenient and feasible way to obtain the demonstration information of daily living tasks, but also lay a good foundation for the assistive robot to learn relative motion skills, especially for the demonstrated dexterous manipulation skills, and semi-autonomously accomplish complex, multi-step tasks following the user’s instructions in the daily home environment.


2016 ◽  
Vol 5 (6) ◽  
Author(s):  
Moh R. Amer ◽  
Yazeed Alaskar ◽  
Hussam Qasem ◽  
Fadhel Alsaffar ◽  
Abdulrahman Alhussain

AbstractDuring the past few years, scientists have shown that climate change is a serious problem that mandates adequate solutions. Greenhouse gas emissions such as carbon dioxide contribute to heat trapping in the atmosphere, which increases the global temperature. Reducing greenhouse gas emissions and the carbon footprint to zero is an essential step toward maintaining a 2°C temperature change. In doing so, researchers and scientists have focused much attention on finding alternative technologies that provide clean and sustainable energy. In particular, nanotechnology can offer this alternative solution to the ongoing energy crisis. The recent progress in nanomaterial research has focused on the development of high-efficiency optoelectronics, batteries, low-power electronics, and thermoelectric devices for energy generation applications. With the emergence of new nanomaterials, such as carbonaceous materials and transition metal dichalcogenides, new physics have emerged. Scientists and engineers are still eager to answer some of the fundamental issues concerning these nanomaterials, including optical, electrical, and thermal properties. Yet, to this day, nanotechnology solutions to provide a sustainable energy are hinged by the ability to control and fully understand the properties of these nanomaterials. Here, we highlight some of the recent progress carried out in nano-optoelectronics, and share our thoughts on the opportunities and challenges facing low-dimensional devices to generate clean and sustainable energy.


Author(s):  
Wenjie Wang ◽  
Shouqi Yuan ◽  
Ji Pei ◽  
Jinfeng Zhang ◽  
Jianping Yuan ◽  
...  

To improve the performance of the centrifugal pump with a vaned diffuser, the influence of impeller geometric parameters on external characteristics of the pump was investigated by Orthogonal Experimental Method (OEM) based on CFD. Blade outlet width b2, blade wrap angle φ, blade outlet angle β2, and blade number Z were selected as the main impeller geometric parameters and the orthogonal experiment of L9 (33*21), which contained 3 levels of the 3 factors and 2 levels of one factor, was done in this study. Three-dimensional steady simulations were conducted by solving the RANS equations in the design procedure with SST k-ω turbulence model, and about 5.3 million structured grids for the whole calculation domains were used. The experimental results were justified by the variance analysis method. The inner flow of the pump was also analyzed in order to obtain the flow behaviors that can affect the pump performance. The results showed that the blade outlet angle β2 had the greatest influence on the efficiency and power. The high efficiency area of the optimal impeller is wider. The final optimized impeller accomplished better pump performance, which meet the design requirements. The velocity distribution in the optimized impeller is more regular and the area of the high turbulence kinetic energy is smaller in the optimal impeller.


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