Experimental Research on the Influence of Inlet Conditions of Corrugated Plate Dryer

2017 ◽  
Author(s):  
Mao Feng ◽  
Tian RuiFeng ◽  
Chen BoWen ◽  
He Wei
Keyword(s):  
Pressure Drop ◽  
Steam Generator ◽  
Experimental Research ◽  
Separation Efficiency ◽  
Experimental Studies ◽  
Separation Performance ◽  
Separation Mechanism ◽  
Airflow Velocity ◽  
Pressurized Water ◽  
Water Separation

Corrugated plate dryer is one of the key components of natural circulation steam generator in the pressurized water reactor nuclear power plant. It play a decisive role in the water separation system to making steam become a good quality after steam flow out of a vertical steam generator. With the increase of the reactor power in the future design, it requires that the performance of corrugated plate dryer must be increased in the characteristics of steam load, separating efficiency, volume and resistance to make sure that steam generators still produce qualified steam at higher steam loads and higher cycle magnitudes. In this paper, we have done some experimental studies on the corrugated plate dryer. And we concentrated on airflow parameters on the separation performance and resistance performance of dryer. (1) First of all, we have determined the experimental research program about this study, after this, we finished the design works of the test bench, and then we have completed the construction work based on the design works. (2) Afterwards, the flow and separation mechanism of the wave plate dryer was experimentally studied by means of parameter measurement and analysis combined with observation and recording. The effects of different inlet humidities and inlet velocity on separation efficiency, pressure drop and re-entrainment were studied. The above study shows that: (1) The separation efficiency of corrugated plate dryer is related to inlet humidity and inlet airflow velocity. The separation efficiency of corrugated plate dryer is increase with inlet humidity goes higher, and increased to reach a highest point then goes down when inlet airflow velocity increased. (2) The re-entrainment is related to inlet humidity. When inlet humidity increased, the inlet airflow critical velocity which lead to re-entrain would decrease. (3) The pressure drop of dryer is related to the inlet airflow velocity. When the inlet wind velocity increases, the pressure drop increases.

scholarly journals Influence of Vortex Finder Structure on Separation Performance of Double-Overflow Three-Product Hydrocyclones

Separations ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 79
Author(s):  
Yuekan Zhang ◽  
Jiangbo Ge ◽  
Lanyue Jiang ◽  
Hui Wang ◽  
Junru Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Experimental Research ◽  
Separation Efficiency ◽  
Structural Parameters ◽  
Separation Performance ◽  
Insertion Depth ◽  
Flow Field Characteristics ◽  
Vortex Finder ◽  
Fine Classification

In view of the difficulty of traditional hydrocyclones to meet the requirements of fine classification, a double-overflow three-product (internal overflow, external overflow and underflow) hydrocyclone was designed in this study. Numerical simulation and experimental research methods were used to investigate the effects of double-overflow flow field characteristics and structural parameters (i.e., internal vortex finder diameter and insertion depth) on separation performance. The research results showed that the larger the diameter of the internal vortex finder, the greater the overflow yield and the larger the cut size. The finest internal overflow product can be obtained when the internal vortex finder is 30 mm longer than the external vortex finder. The separation efficiency is highest when the internal vortex finder is 30 mm shorter than the external vortex finder.

Analysis of Droplet Impacting on Inclined Wall

2020 ◽  
Author(s):  
Bowen Chen ◽  
Bo Wang ◽  
Bingzheng Ke ◽  
Ru Li ◽  
Ruifeng Tian
Keyword(s):  
Steam Generator ◽  
High Speed ◽  
Nuclear Power ◽  
Separation Efficiency ◽  
Inertial Force ◽  
High Speed Photography ◽  
Separation Mechanism ◽  
The Relationship ◽  
Plate Separator

Abstract The steam generator is an important part of the nuclear power plant, and the corrugated plate separator plays the important role of drying steam in the steam generator to improve power generation efficiency and protect the safety of the system. The separation mechanism of the corrugated plate separator is relatively complicated. The droplets are moved by the drag force of the steam and gravity in the corrugated plate separator, and captured by the wall of the corrugated plate separator. When the velocity is increased, the inertial force of droplet is increased, so that the droplet is more easily captured by the wall of the corrugated plate separator, and the separation efficiency of the corrugated plate separator is increased. In this paper, the phenomenon of droplet impact on the inclined wall is studied by high-speed photography technology, and the cause and mechanism of the phenomenon are analyzed. By analyzing the spreading and splashing on the droplets impacting on the inclined wall, the relationship between the inclination angle of the droplet impacting on the inclined wall and the spreading is obtained, and the influence of droplets with different Weber numbers, and dry and wetted walls were analyzed, which provide a basis for the optimization of the corrugated plate separator.

Experimental Study and Analysis of Different Air-Injecting Segment on the Separation Performance of Air-Injected De-Oiling Hydrocyclone

2008 ◽  
Author(s):  
Minghu Jiang ◽  
Dehai Chen ◽  
Lixin Zhao ◽  
Liying Sun
Keyword(s):  
Experimental Study ◽  
Theoretical Analysis ◽  
Separation Efficiency ◽  
State Of The Art ◽  
Experimental Studies ◽  
Separation Performance ◽  
Research Results ◽  
Compound Body ◽  
Oil Gas

Developing state-of-the-art and separating principle of deoiling hydrocyclones are introduced. By theoretical analysis, the ways to enhance hydrocyclone’s separation efficiency are described. One way is to inject air into the hydrocyclones so as to combine with oil to form oil-gas compound body, and then increase de-oiling efficiency. By means of injecting air into large cone segment, or fine cone segment of the hydrocyclone, experiments were carried out. It is found that the best injecting part is fine cone segment. Further experimental studies were continued for confirming detail part in fine cone segment, which includes one-third segment and two-thirds segment for the sake of research. Results show that the best air-injecting part is the first one-third segment of fine cone segment. This conclusion would be useful for understanding of air-injected de-oiling hydrocyclone’s separating process, and for its design and applications.

Study of the Particle Separation Performance of a Dust-settling Hopper

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Bofu Wu ◽  
Jinlai Men ◽  
Jie Chen
Keyword(s):  
Fluid Dynamics ◽  
Particle Concentration ◽  
Separation Efficiency ◽  
Simulation Analysis ◽  
Numerical Study ◽  
Particle Separation ◽  
Separation Performance ◽  
Particle Removal ◽  
Airflow Velocity ◽  
Calculation Results

This paper presents a numerical study to predict the particle separation performance of a dust-settling hopper using computational fluid dynamics. The Euler-Lagrange approach was employed to analyze the particle separation efficiency and the outflow particle concentration of the dust-settling hopper under different inlet airflow velocities. The calculation results obtained reveal that the overall particle separation efficiency and the outflow particle concentration decrease with the increase of the inlet airflow velocity, and the particle grade efficiency increases with particle size. Since there is a paradox between the particle separation performance and the particle removal performance for a street vacuum sweeper, it is necessary to counter-balance the effects of the inlet airflow velocity on them. According to the simulation analysis, an appropriate inlet airflow velocity is provided for the design of the dust-settling hopper.

Investigation on Flow and Breakdown Characteristics Under Horizontal Shear of Water Film Falling Down Vertical Corrugated Plate Dryer

2018 ◽  
Author(s):  
Bo Wang ◽  
Rui-feng Tian ◽  
Chen Bowen ◽  
Mao Feng
Keyword(s):  
Film Thickness ◽  
Separation Efficiency ◽  
Water Film ◽  
Experimental Result ◽  
Horizontal Shear ◽  
Airflow Velocity ◽  
Water Separation ◽  
Water Film Thickness ◽  
Film Breakdown ◽  
Two Phases

The corrugated plate dryer is a very important equipment for the steam-water separation in the steam generator. Its separation efficiency determines the economic indicators of nuclear power plants. The study of the complicated steam-water separation mechanism of the corrugated plate dryer is very helpful to improve its separation efficiency. Flow and breakdown characteristics under horizontal shear of water film falling down vertical corrugated plate dryer is investigated. Air and water are used as the two phases in the research. This paper also derives a model calculating the critical airflow velocity of water film breakdown and completes the comparison of the experimental result and the result calculated by the model. The relationship between the water film thickness and critical airflow velocity of water film breakdown is investigated through the experiment. In addition, the water film thickness is measured according to CCD high-speed camera acquisition system and the Planar Laser Induced Fluorescence (PLIF) method is also used for the measurement. The experimental result reveals that the critical airflow velocity of water film breakdown is related to the corrugated plate structural parameters, the properties of the two phases and the water film thickness. The critical airflow velocity of water film breakdown and the water film thickness are negatively correlated. The result calculated by the model is in good agreement with the experimental result as the water film thickness is large in a certain range.

A multi-function textile with pH-induced switch wettability transition for controllable oil−water separation

2021 ◽  
pp. 004051752110569
Author(s):  
Long Feng ◽  
Yimiao Hou ◽  
Qingqing Hao ◽  
Mingxing Chen ◽  
Shuo Wang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Separation Efficiency ◽  
Nonwoven Fabric ◽  
Dip Coating ◽  
Municipal Sewage ◽  
Alkaline Condition ◽  
Separation Performance ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water

The deterioration of water ecology caused by the discharge of oil spill wastewater, industrial sewage, and municipal sewage has attracted wide attention worldwide. Thus, it is significant to design a simple, environmentally friendly approach to separate oil–water mixtures. In this work, three different fabrics with pH-induced wettability transition were prepared by a dip-coating process for oil and water separation. The dip-coating fabrics had the advantages of oil–water separation, photocatalytic degradation, and recycling. Polyethylene terephthalate/polyamide nonwoven fabric was used as the substrate materials of the fabric. The carboxylic acid-modified TiO2 endowed the fabric with hydrophilicity–hydrophobicity and photocatalytic properties. The Fe3O4 nanoparticles obtained by the coprecipitation method provided magnetism for the fabric, facilitating the recycling of the fabric and improving the hydrophobicity of the fabric. The fabrics coated with dipping solutions were superhydrophobic in a neutral environment and hydrophilic in an alkaline environment. Among the three coated fabrics, the fabric coated with stearic acid/TiO2-Fe3O4 (FST) had the most satisfying oil–water separation performance and durability. Under the neutral condition, the contact angle of the FST was 151° and the separation efficiency was 98%. Under the alkaline condition, the underwater oil contact angle of the FST was 150° and the separation efficiency was 95%. After 15 cycles, the oil–water separation rate of the FST was still higher than 90%. Due to the presence of TiO2, the coated fabric had an exceptional performance in the photodegradation of organic pollutants (69.9%). In addition, the fabrics can be quickly recovered due to magnetism.

Parameter Analysis of the Static Droplets Phase Transformation Under the Pressure Variation Condition

2016 ◽  
Author(s):  
Fulong Zhao ◽  
Qianfeng Liu ◽  
Hanliang Bo
Keyword(s):  
Phase Transformation ◽  
Steam Generator ◽  
Pressure Variation ◽  
Parameter Analysis ◽  
Separation Mechanism ◽  
Time Step ◽  
Water Separation ◽  
Ultimate Pressure ◽  
Water Separator ◽  
Calculation Results

The steam-water separator is a vital important plant in the steam generator, whose function is to remove transported small droplets in the vapor stream and provide the high quality saturated steam for the steam turbine. The performance of the steam-water separator in the steam generator has a great impact on the safety and economy of the nuclear power station. The steam-water separation mechanism is far from maturity as a result of the complexity of the separator structure and the interaction of the steam, droplets together with the liquid film. Our research team tries to build a new research route about the steam-water separation mechanism from the microcosmic behavior aspects of the droplets including the production, movement, collision, extinction as well as the phase transformation. When the droplets move during the steam-water separator, the pressure could decrease continuously due to the resistance and the structure variation, which may break the liquid-vapor equilibrium and make the droplets evaporate and then could greatly influence the steam-water separating characteristics. This paper builds a hydrodynamic-kinetic model on the static droplets phase transformation under the pressure variation condition based on the physics phenomenon description of the droplets evaporation as well as the mechanism explanation. Through different kinds of calculations by change of the time step, the model has been proved to be independent on the time step. In order to make sure that the new model is correct, this paper compares the calculation results with the experimental ones and finds that the calculation results are in wonderful accordance with the existing experimental data. The relative errors between the calculation results and the experimental ones are between ± 5%. At last, this paper conducts the detailed sensitivity analysis of different relative parameters, which are useful for the understanding of the process of the droplets evaporation as well as could deepen the comprehension of the droplets phase transformation mechanism under the condition of the pressure change. The calculation results show that the evaporation characteristics of the static droplets under the pressure variation condition are predominantly influenced by the initial pressure, the ultimate pressure of the environment, as well as the difference of the initial and ultimate pressure. In addition, the initial radius of the droplets and the environment temperature can have a great impact on the droplets evaporation characteristics This model could provide the theoretical reference for further study of the process of the droplets phase transformation during transport in the steam-water separator as well as the steam-water separating performance of the separator, which can guide the design of the steam-water separation plants.

Numerical Simulation of a Gas-Liquid Cylindrical Cyclone

2012 ◽  
Vol 516-517 ◽  
pp. 1058-1061 ◽  
Author(s):  
Ming Hu Jiang ◽  
Zhen Wang ◽  
Jia Li You ◽  
Li Xin Zhao
Keyword(s):  
Pressure Drop ◽  
Gas Phase ◽  
Pressure Field ◽  
Separation Efficiency ◽  
Separation Performance ◽  
Distribution Characteristics ◽  
Cylindrical Cyclone ◽  
Computational Fluid Dynamics Cfd ◽  
Inlet Position ◽  
High Separation

Inner flow field, pressure field and gas phase concentration of the gas-liquid cylindrical cyclone (GLCC) was studied and simulated with a Fluent soft pack by means of Computational Fluid Dynamics (CFD). Distribution characteristics of pressure drop and velocity field of the GLCC reveal that the inlet position and the outlet diameter of overflow can affect its separation performance. Low pressure drop and high separation efficiency can be obtained by designing the inlet position and the overflow tube diameter.

Experimental Study on the Droplet Separation Performance of PTFE Demister

2014 ◽  
Vol 644-650 ◽  
pp. 5252-5255
Author(s):  
Feng Ming Zhang ◽  
Dong Dong Feng ◽  
Yu Xu ◽  
Xiao Bin Pei ◽  
Shun Quan Chen ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pressure Drop ◽  
Flow Rate ◽  
Separation Efficiency ◽  
Steam Flow ◽  
Separation Performance ◽  
Steam Flow Rate

An experiment setup was built to test the droplet separation performance of demister. Different experiments were conducted using various Polytetrafluoroethene (PTFE) meshes. Results show that the separation efficiency of demister is dependent on screen thickness, mesh count. Pressure drop increases with the increase of steam flow rate and screen thickness.

scholarly journals Experimental Investigation on the Separation Performance for a New Oil-Water Separator

2021 ◽  
Vol 8 ◽  
Author(s):  
Min Zhan ◽  
Wanyou Yang ◽  
Fenghui Zhang ◽  
Changhua Luo ◽  
Huaxiao Wu ◽  
...  
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Separation Efficiency ◽  
Water Flow Rate ◽  
Operating Parameter ◽  
Separation Performance ◽  
Water Separation ◽  
Split Ratio ◽  
Oil Fraction ◽  
Oil Water

To reduce the cost of oil exploitation, it is necessary to promote the development of cyclones for oil-water separation due to the increase of the water content in produced fluids. However, there are some limitations and disadvantages for the conventional separation device including bulky settling tanks and hydrocyclones. In this paper, a new axial inlet separator with two reverse flow outlets and a downstream flow outlet is introduced. In addition, an experimental system was designed and fabricated to investigate the effects of inlet flow rate, oil fraction, and a controlled split ratio on separation performance. The separator maintains high separation efficiency within the experimental range, namely water flow rate (4–7 m3/h), and oil fraction (1%–10%). Furthermore, the results show that a higher water flow rate and oil fraction will affect the separation efficiency. The change of a pressure drop in the separator was analyzed as well. Moreover, the controlled split ratio is a serious operating parameter, and a larger controlled split ratio is conducive to the separation performance.

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