Study on Pressure Drop Characteristics of a Two-Stage Swirler Separator

2021 ◽  
pp. 1-13
Author(s):  
Zhihui Wang ◽  
Xingkai Zhang ◽  
Ruiquan Liao ◽  
Yu Lei ◽  
Zhigang Fang
Keyword(s):  
Pressure Drop ◽  
Gas Flow ◽  
High Efficiency ◽  
Separation Efficiency ◽  
Movement Pattern ◽  
Superficial Velocity ◽  
Dominant Factor ◽  
Liquid Volume ◽  
Maximum Pressure ◽  
Two Stage

Summary The vane swirler separator is widely used in the separation process of wet natural gas owing to a small volume, high efficiency, economy, and environmental protection. In addition to the separation efficiency, the pressure drop is also an important technical and operational index for evaluating the performance of the swirler. In this study, the pressure drop of a swirler vane separator was studied through laboratory experiments and numerical simulations. Through the visualization experimental study of the liquid membrane formation rule and its movement pattern, the reduced gas velocity on the pressure drop was divided into three stages. For a gas superficial velocity less than 5.69 m/s, the effect of gas superficial velocity on the pressure drop was small; for a gas superficial velocity greater than 16.57 m/s, the pressure drop increased significantly with an increase in gas flow rate, and the maximum pressure drop was generated by the two-stage swirler, downstream of which the pressure decreased precipitously. We also observed that when the liquid volume content was less than 3%, the gas superficial velocity was the dominant factor affecting the change in the pressure drop. The average relative error of the pressure drop prediction model based on the conservation of the energy law was 6.16%, which indicated a high calculation accuracy.

scholarly journals Performance of a cyclone scrubber on removal of fine particulate matter

2020 ◽  
Vol 26 (1) ◽  
pp. 31-40
Author(s):  
Ana Achiles ◽  
Vádila Guerra
Keyword(s):  
Pressure Drop ◽  
Sugar Cane ◽  
Gas Flow ◽  
High Efficiency ◽  
Fine Particles ◽  
Collection Efficiency ◽  
Sugar Cane Bagasse ◽  
Flow Ratio ◽  
Liquid Injection ◽  
Gas Flow Ratio

Cyclones are not classified as effective devices for removing fine particles, while high efficiency wet scrubbers usually have high operational costs. In order to achieve better performance, the aim of this study is to evaluate, for the first time, a cyclone scrubber design based on the dimensions of a Stairmand cyclone separator with the inclusion of liquid injection nozzles located in different positions to improve the separation of fine particles. Given the lack of studies considering the effect of liquid injection and other operational conditions in the removal performance of a cyclone scrubber with Stairmand dimensions, the present paper provides a complete evaluation of these effects for the separation of sugar cane bagasse ash from air. The parameters investigated were inlet gas velocity, liquid injection position, liquid-to-gas flow ratio and droplet size distribution. The cyclone scrubber performance was evaluated considering collection efficiency and pressure drop. Overall efficiency of almost 99% and low-pressure drop was achieved by employing a liquid-to-gas flow ratio of 0.43 L/m? for the collection of ash from the combustion of sugar cane bagasse. Grade efficiencies revealed that injecting droplets into cyclones significantly improved the removal of fine particles with an aerodynamic diameter less than 2.5 ?m.

Numerical Simulation Analysis of Corrugated Plate With Hook

2017 ◽  
Author(s):  
Bowen Chen ◽  
Ruifeng Tian ◽  
Feng Mao ◽  
Wei He
Keyword(s):  
Pressure Drop ◽  
Steam Turbine ◽  
Steam Generator ◽  
Nuclear Power ◽  
High Efficiency ◽  
Separation Efficiency ◽  
Simulation Analysis ◽  
Saturated Steam ◽  
System Pressure ◽  
Water Separator

Separation device is one of the important equipment in the steam generator, which reduce the humidity, and it is a key device of nuclear plant which can guarantee the saturated steam to the steam turbine to provide clean. In nuclear power plant, the nuclear steam turbine uses saturated steam directly, so the separation system in steam generator requires a high efficiency of separation. Because of its simple process, high separation efficiency, low system pressure drop and large capacity, small volume, long life and other advantages, corrugated plate in water separator technology is more and more extensive application in the production process. In this paper, the corrugated plate water separator is simulated research, through the establishment of a two-dimensional model of corrugated plate, separation efficiency and pressure drop of corrugated plate is simulated. By setting the different air speed, different gap of hook-plate, observe the change of the pressure drop and separation efficiency, and analyzes the internal mechanism of the foundation for the optimization of corrugated plate dryer.

A Novel Inertial Separator for CFB Boilers

2005 ◽  
Author(s):  
Han-Ping Chen ◽  
Qiao He ◽  
Shi-Hong Zhang ◽  
Chu-Guang Zheng ◽  
De-Chang Liu ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Fine Particles ◽  
Circulating Fluidized Bed ◽  
Separation Efficiency ◽  
Scale Up ◽  
Low Pressure ◽  
Great Difficulty ◽  
Separation Mechanism ◽  
The Novel ◽  
Two Stage

Besides several cyclone separators, some inertial separators had also developed and applied in the circulating fluidized bed (CFB) boilers. The inertial separators have some advantages such as simple structure, small volume, low pressure drop, easy scale-up and so on. But almost every existing inertia separator has great difficulty in solving the main shortage of lower separation efficiency especially for fine particles. Based on the research for the separation mechanism and performances of inertial separators, the State Key Laboratory of Coal Combustion (SKLCC) had developed a novel inertial separator for CFB boilers. The patented separator improves the structure of the U-beam that is the separation element of U-beam separators of Studsvik Energiteknik (Sweden) and Babcok & Wilcox (USA). A ash channel is added to avoid re-entrainment of the separated solid downward along the U-beam. Test result indicates that the novel separator has great higher separation efficiency with the same pressure drop, compared with the U-beams at same conditions. The novel separator is more suitable for a larger CFB boiler or repowering projects as primary separator than the U-beams. The novel inertial separator had been used for designing 25 ∼ 420 tons of steam per hour (t/h) two-stage-recirculation CFB boilers. The two-stage-recirculation CFB boilers in capacity of 25 t/h and 65t/h had been put into operation. This paper presents the work on research, development and application of the novel inertial separator with high separation efficiency and low pressure drop.

Fluid Dynamics Study of the Influence of Direction of the Gas Flow in Fabric Filter

2010 ◽  
Vol 660-661 ◽  
pp. 520-524 ◽  
Author(s):  
Sandra Mara Santana Rocha ◽  
Luiz Gustavo Martins Vieira ◽  
M.L. Aguiar ◽  
João Jorge Ribeiro Damasceno
Keyword(s):  
Fluid Dynamics ◽  
Pressure Drop ◽  
Gas Flow ◽  
High Efficiency ◽  
Fluid Dynamic ◽  
Particulate Material ◽  
Dynamic Simulations ◽  
Environmental Laws ◽  
Fabric Filter ◽  
Operational Costs

The new environmental laws, as well as the search for technologies of accuracy production, have leaded companies to search for more and more efficient equipment. Regarding the emission of particulate material, the fabric filter is the most used equipment in the industry, for presenting a high efficiency and low operational costs, essential in any project of this type. In the search for a more efficient and economic filtering operation, this work studied, by techniques of CFD, the modification of the traditional way of feeding a filtering box (usually accomplished by the side of the system) by another in which the feeding was accomplished through the bottom of the equipment, in order to review the distribution of volumetric outflows in the bags and pressure drop. The fluid dynamic simulations had shown that the feeding fluid - through the bottom of the filtering box - provides an inferior operational pressure drop and a better distribution of fluids between the bags.

scholarly journals Performance comparison of a structured bed reactor with and without a chimney tray on the gas-flow maldistribution: A computational fluid dynamics study

2019 ◽  
Vol 234 (1) ◽  
pp. 83-97
Author(s):  
Hajer Troudi ◽  
Moncef Ghiss ◽  
Mohamed Ellejmi ◽  
Zoubeir Tourki
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Pressure Drop ◽  
Gas Flow ◽  
Orientation Angle ◽  
Turbulence Models ◽  
Axial Direction ◽  
Packed Bed ◽  
Performance Comparison ◽  
Maximum Pressure

In the present paper, two configurations of structured reactors (with and without) chimney tray placed below the packed bed have been investigated to study their effect on maldistribution factor and pressure drop characteristics. A simulation result based on a three-dimensional computational fluid dynamics was involved using ANSYS Fluent. First, maldistribution factors without chimney tray were calculated and compared to the results taken from the literature. The results were found to be in good agreement with the experimental data of Yuan et al. Second, the reactor with a chimney tray was modeled in Fluent, and steady-state simulations were performed. The uniformity due to the turbulence of the fluid was carried out using different turbulence models, and the velocity profiles along the axial direction inside the reactor were obtained. As a result, the comparison shows that the presence of a chimney tray yields lower maldistribution factor enhancement by 23% compared to the conventional structured reactor under the same operating condition. The effect of the plate orientation is also determined, and it is found that the maximum pressure drop is achieved through the rows with an orientation angle of α = 45° up to 2.3% higher than of α = 0° and α = 90°.

scholarly journals Dewatering of Kerosene using Hydrocyclone

2020 ◽  
Vol 26 (11) ◽  
pp. 84-99
Author(s):  
MOHANAD Abd RAHEEM ◽  
Raghad Fareed Qassim
Keyword(s):  
Pressure Drop ◽  
Dimensional Analysis ◽  
Flow Rate ◽  
Separation Efficiency ◽  
Water Concentration ◽  
Maximum Pressure ◽  
Oil Emulsion ◽  
Split Ratio ◽  
Pi Theorem ◽  
Maximum Separation

Water/oil emulsion is considered as the most refractory mixture to separate because of the interference of the two immiscible liquids, water and oil. This research presents a study of dewatering of water / kerosene emulsion using hydrocyclone. The effects of factors such as: feed flow rate (3, 5, 7, 9, and 11 L/min), inlet water concentration of the emulsion (5%, 7.5%, 10%, 12.5%, and 15% by volume), and split ratio (0.1, 0.3, 0.5, 0.7, and 0.9) on the separation efficiency and pressure drop were studied. Dimensional analysis using Pi theorem was applied for the first time to model the hydrocyclone based on the experimental data. It was shown that the maximum separation efficiency; at split ratio 0.1, was 94.3% at 10% concentration and 11 L/min flow rate; at 0.3 split ratio, was 70.8% at 10% concentration and 11 L/min flow rate; at split ratio 0.5, was 82.1% at 12.5% concentration and 11 L/min flow rate; at split ratio 0.7, was 70% at 11 L/min, for 5%, 7.5%, and 12.5% concentrations; at 0.9 split ratio was 96.8% at 11 L/min flow rate and 5% concentration. The maximum separation obtained within these ranges of variables was 96.8% at 0.9 split ratio, 11 L/min flow rate and 5% concentration. The maximum pressure drop recorded was 3.6 bar at split ratio 0.1 and 11 L/min flow rate for all concentrations. The correlations obtained by the dimensional analysis were;  at split ratio 0.1,  at split ratio 0.3,  at split ratio 0.5,   at split ratio 0.7, and  at split ratio 0.9. As an average  for all the studied variables.  

scholarly journals An Experimental Study of Gas Flow Regime and Pressure Drop in a Random Packed Bed with Sinter Particles

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 872
Author(s):  
Zude Cheng ◽  
Haitao Wang ◽  
Junsheng Feng ◽  
Hui Dong
Keyword(s):  
Pressure Drop ◽  
Turbulent Flow ◽  
Flow Regime ◽  
Gas Flow ◽  
Particle Diameter ◽  
Flow Regimes ◽  
Packed Bed ◽  
Superficial Velocity ◽  
Experimental Conditions ◽  
Gas Flow Regime

The gas flow regime and pressure drop in a gas–solid packed bed with irregularly shaped sinter particles were experimentally investigated. Using a self-made experimental facility for data measurement, the gas flow pressure drop in a sinter bed layer was determined for various experimental conditions. According to the changes in the modified coefficients, α and β, for different flow regimes, the flow transitions from one regime to another in packed beds with different particle diameters were described. Furthermore, the pressure drop correlations for different flow regimes were determined, and the reliabilities of the obtained correlations were contrastively analyzed. The results show that, when the particle diameter is constant, the modified pressure drop per unit height, ΔP/Hu, increases linearly with the increasing gas superficial velocity. When the gas superficial velocity is larger than 1.15 m/s under atmospheric conditions, the gas flow regime in the sinter bed layer is the turbulent flow. Compared with the experimental correlation of the whole flow, the pressure drop correlations obtained by the piecewise fitting method provided a better prediction of the experimental values, and the average deviations of the obtained correlations for the Forchheimer flow and the turbulent flow were 5.31% and 4.07%, respectively.

Recent Advances in Heterostructured Photocatalysts for Degradation of Organic Pollutants.

2020 ◽  
Vol 17 ◽  
Author(s):  
Chen-Jing Sun ◽  
Li-Ping Zhao ◽  
Rui Wang
Keyword(s):  
Organic Pollutants ◽  
High Efficiency ◽  
Separation Efficiency ◽  
Organic Pollution ◽  
Utilization Rate ◽  
Type I ◽  
Human Beings ◽  
Global Challenge ◽  
Global Environmental ◽  
High Efficient

: With the development of industrialization, the global environmental pollution and energy crisis are becoming increasingly serious. Organic pollutants pose a serious health threat to human beings and other organisms. The removal of organic pollutants in environment has become a global challenge. The photocatalytic technology has been widely used in the degradation of organic pollutants with its characteristics of simple process, high efficiency, thorough degradation and no secondary pollution. However, the single photocatalyst represented by TiO2 has disadvantages of low light utilization rate and high recombination rate of photocarriers. Building heterojunction is considered one of the most effective methods to enhance the photocatalytic performance of single photocatalyst, which can improve the separation efficiency of photocarriers and utilization of visible light. The classical heterojunction can be divided into four different cases: type I, typeⅡ, p–n heterojunctions and Z-scheme junction. In this paper, the recent progress in the treatment of organic pollution by heterostructure photocatalysts is summarized and the mechanism of heterostructure photocatalysts for the treatment of organic pollutants is reviewed. It is expected that this paper can deepen the understanding of heterostructure photocatalysts and provide guidance for high efficient photocatalytic degradation of organic pollutants in the future.

"Recent Patents on the Triboelectrostatic Separation of Fly Ash"

2019 ◽  
Vol 13 ◽  
Author(s):  
Haisheng Li ◽  
Wenping Wang ◽  
Yinghua Chen ◽  
Xinxi Zhang ◽  
Chaoyong Li
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
High Efficiency ◽  
Separation Efficiency ◽  
High Reliability ◽  
Operating Conditions ◽  
Security Requirements ◽  
Unburned Carbon ◽  
Efficient Operation ◽  
Triboelectrostatic Separation

Background: The fly ash produced by coal-fired power plants is an industrial waste. The environmental pollution problems caused by fly ash have been widely of public environmental concern. As a waste of recoverable resources, it can be used in the field of building materials, agricultural fertilizers, environmental materials, new materials, etc. Unburned carbon content in fly ash has an influence on the performance of resource reuse products. Therefore, it is the key to remove unburned carbon from fly ash. As a physical method, triboelectrostatic separation technology has been widely used because of obvious advantages, such as high-efficiency, simple process, high reliability, without water resources consumption and secondary pollution. Objective: The related patents of fly ash triboelectrostatic separation had been reviewed. The structural characteristics and working principle of these patents are analyzed in detail. The results can provide some meaningful references for the improvement of separation efficiency and optimal design. Methods: Based on the comparative analysis for the latest patents related to fly ash triboelectrostatic separation, the future development is presented. Results: The patents focused on the charging efficiency and separation efficiency. Studies show that remarkable improvements have been achieved for the fly ash triboelectrostatic separation. Some patents have been used in industrial production. Conclusion: According to the current technology status, the researches related to process optimization and anti-interference ability will be beneficial to overcome the influence of operating conditions and complex environment, and meet system security requirements. The intelligent control can not only ensure the process continuity and stability, but also realize the efficient operation and management automatically. Meanwhile, the researchers should pay more attention to the resource utilization of fly ash processed by triboelectrostatic separation.

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