Effect of Feed-Flow Rate in a Solid-Liquid Hydrocyclone Based on Total Solid Recovery Equation

2017 ◽  
Vol 751 ◽  
pp. 173-179
Author(s):  
Pichai Soison ◽  
Pakpoom Supachart ◽  
Pratarn Wongsarivej
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Concentration Ratio ◽  
Separation Efficiency ◽  
Total Solid ◽  
Feed Flow Rate ◽  
Solid Concentration ◽  
Flow Ratio ◽  
Flow Rates ◽  
Solid Liquid

Many studies of hydrocyclones have confirmed that increasing the feed-flow rate results in a higher separation efficiency. The purpose of this study was to investigate the separation efficiency for a 100 mm solid–liquid hydrocyclone with 1 and 2 wt% solid concentrations at feed-flow rates of 2, 3, 4, 5 and 6 m3/hr. The solid concentration and particle size distribution were analysed using drying–weighing and a particle-size analyser (Mastersizer 2000), respectively. The experimental results indicated that an increase in feed-flow rate from 2 to 4 m3/hr produced decreased separation efficiency. However, when the feed-flow rates increased from 4 to 6 m3/hr, the separation efficiency increased. Furthermore, the higher the feed-flow rate, the smaller the cut size. A novel separation efficiency equation in terms of the concentration ratio and flow ratio is also proposed.

Development of a Regression Model of Stk50Eu for a Hydrocyclone

2017 ◽  
Vol 751 ◽  
pp. 151-159
Author(s):  
Pakpoom Supachart ◽  
Santita Rattanaphan ◽  
Pichai Soison ◽  
Thanit Swasdisevi ◽  
Pratarn Wongsarivej
Keyword(s):  
Regression Model ◽  
Separation Efficiency ◽  
Experimental Result ◽  
Feed Flow Rate ◽  
Solid Concentration ◽  
Constant Flow ◽  
Flow Ratio ◽  
Vortex Finder ◽  
Average Size ◽  
The Relationship

A hydrocyclone is a device used widely in various industries, especially for separation of solids from liquids. Many factors affect the separation efficiency of a hydrocyclone. In this research, the main objectives were a study of the conical length that affected the separation efficiency and proposal of a regression model of Stk50Eu for a hydrocyclone. First, research was performed on the separation efficiency using a 40-mm hydrocyclone. The effects of conical lengths of 200, 240 and 280 mm were investigated. The tested suspension was a mixture of silica and water. The silica particles have an average size of 9–10 μm at a solid concentration of 0.5% w/v. The feed-flow rate of 1 m3/hr was operated with the constant flow ratio of 0.1. From the experimental result, it was found that the shorter conical length obtained the higher separation efficiency. For a conical length of 200 mm, the cylindrical length of 60 mm and the vortex finder length of 40 mm showed the best separation efficiency, up to 84.06%. Second, a regression model of Stk50Eu of the hydrocyclone was established. In this work, data obtained from a total of 75 experiments in the first part and from earlier research were used to form the relationship between the dimensions of the hydrocyclone and Stk50Eu. The calculated Stk50Eu can successfully be used to predict experimental Stk50Eu.

scholarly journals Study of GLR and Inlet Velocity on Hydrocyclone for Fracturing Flow-Back Fluids

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Bing Liu ◽  
Huajian Wang ◽  
Luncao Li ◽  
Zhenjiang Zhao ◽  
Liping Xu ◽  
...  
Keyword(s):  
Particle Size ◽  
Separation Efficiency ◽  
Tangential Velocity ◽  
Reynolds Stress Model ◽  
Optimum Range ◽  
Inlet Velocity ◽  
Split Ratio ◽  
Vortex Finder ◽  
Computational Fluid Dynamics Cfd ◽  
Solid Liquid

In this work, based on the Reynolds stress model (RSM) of the computational fluid dynamics (CFD) software Fluent and experimental method, the velocity field, pressure characteristics, split ratio, and separation efficiency of the hydrocyclone are analyzed under different gas-liquid ratios (GLRs). For the inlet velocity, the lower limit is ascertained by the flow field stability, the upper limit is largely determined by the energy consumption, and the optimum range is 4 m/s to 10 m/s. Within the optimum range, the peak value of tangential velocity increases while the GLR increases, whereas the pressure and pressure drop decrease. With the increase in the GLR, the axial velocity decreases, and the locus of zero vertical velocity shifts inward. The increase in the GLR causes more gas to collect at the vortex finder, which hinders the discharge of the solid-liquid mixture from the overflow, and the larger the GLR, the faster the decrease in the split ratio. The separation efficiency of particles with a particle size of 15 μm is increased by 6.75%, and the separation efficiency of particles with a particle size of 30 μm is increased by 0.57%. Meanwhile, the separation efficiency is increased by 2.43%, and the cut size d50 is reduced as the GLR increases.

Modeling Pressurized Dense Phase Coal Fluidization and Transport

2019 ◽  
Author(s):  
Bradley R. Adams ◽  
Taylor L. Schroedter
Keyword(s):  
Flow Rate ◽  
Particle Interaction ◽  
Drop Out ◽  
Coal Bed ◽  
Flow Ratio ◽  
Feed System ◽  
Horizontal Pipe ◽  
Flow Rates ◽  
Coal Particles ◽  
Coal Flow

Abstract A transient gas-solid model based on CPFD Software’s Barracuda Virtual Reactor was developed for a feed system to a pilot-scale pressurized oxy-coal (POC) reactor. A simplified geometry with a vertical coal hopper feeding into a 0.635-cm diameter horizontal pipe was used to represent key elements of the feed system. Coal particles were transported with 20-atm CO2 gas. The feed system was required to maintain a steady flow of gas and solids at a coal flow rate of approximately 3.8 g/s and a CO2 to coal mass ratio in the range 1–2. Sensitivity of model results to mesh size and particle interaction sub-model settings was assessed. Two design concepts were evaluated. A gravity-fed concept was found to be infeasible due to inadequate coal flow rates even at very high CO2 to coal flow ratios. This was due to gravitational forces being insufficient to move the pressurized coal from the hopper into the CO2 stream at the desired rate. A fluidized bed concept was found to provide the desired coal flow rate and CO2 to coal flow ratio. CO2 injected at the hopper base first fluidized the vertical coal bed before transporting it through a horizontal exit pipe. A second CO2 inlet downstream of the hopper exit pipe was used to dilute the fluidized coal and increase pipe velocities to minimize coal drop out. The amount of coal transported from the hopper was dependent on the net CO2 hopper flow but independent of the CO2 dilution flow. This meant that the coal flow rate and CO2 to coal flow ratio could be controlled independently. Pipe exit coal flow rates were found to fluctuate at levels acceptable for steady burner operation.

scholarly journals OPTIMIZATION OF SPRAY DRYING CONDITION FROM TRAMETES VERSICOLOR MUSHROOM EXTRACT

2020 ◽  
Vol 39 (03) ◽  
Author(s):  
NGUYEN NGOC TUAN ◽  
NGUYEN THI NGAN ◽  
NGUYEN NGOC THUAN ◽  
NGUYEN TRAN NGOC MAI ◽  
NGUYEN DUC VUONG ◽  
...  
Keyword(s):  
Spray Drying ◽  
Flow Rate ◽  
Trametes Versicolor ◽  
Total Solid ◽  
Total Phenolic ◽  
Feed Flow Rate ◽  
Optimal Conditions ◽  
Drying Temperature ◽  
Surface Method ◽  
Experimental Values

In this study, the optimal conditions for the spray drying from Trametes versicolor (V.C.) extracts were determined using response surface method/technique (RSM). One kilogram of material was extracted with 30L ethanol 65% of 70oC for 7 hours. Solids were filtered off, extract was concentrated to obtain solution containing about 20% total solid using a vacuum evaporator. Study on the effects of three independent variables, namely maltodextrin ratio (% w/v), feed flow rate (ml/min) and inlet drying temperature (oC) on the responses; total phenolic content (TPC) and moisture content (MC). The optimal conditions for spray drying process from T. versicolor extracts were found to be maltodextrin ratio of 5%w/v, inlet drying temperature of 160oC and feed flow rate of 26.05ml/min. The experimental values of TPC and MC were 35.76±0.04mg GAE/g, 4.43±0.02%

Study on Hydrocyclone Part of Integration Equipment Used to Pretreatment on High Turbidity Silt Water

2015 ◽  
Vol 1092-1093 ◽  
pp. 927-932
Author(s):  
Dao Ji Wu ◽  
Pei Shi Sun ◽  
Jian Peng Shao ◽  
Lin Wang ◽  
Cheng Long Lv ◽  
...  
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Separation Efficiency ◽  
Optimal Solution ◽  
Water Medium ◽  
Inlet Flow ◽  
Silt Content ◽  
Inlet Flow Rate ◽  
High Turbidity ◽  
Medium Diameter

The silt content of inlet A, inlet flow B and underflow diameter C were the important factors on the separation efficiency of the hydrocyclone, using hydrocyclone for pretreatment of high turbidity silt water. The silt content of inlet selected 5 kg/m3, 4.5 kg/m3, 3 kg/m3, 2.5 kg/m3. Inlet flow rate selected 2.5 m3/h, 2.2 m3/h, 1.8 m3/h, 1.5 m3/h. The optimal solution selected B2A1C2,which was 2.5 m3/h, 2.5 kg/m3and 10 mm. The effects of various factors on the hydrocyclone separation were summarized objectively through the analysis of silt content of overflow and particle size. The result showed that: when the silt content of inlet was kept in a certain range, the medium diameter of overflow decreased to 18μm with the inlet flow rate increasing. Condensed bottle silt can discharged successfully, and the overflow water medium diameter decreased gradually with underflow diameter increasing.

Recovery of Molybdenum (VI) from Aqueous Solution with Packed Foam Column by Steady-State

2013 ◽  
Vol 641-642 ◽  
pp. 270-276
Author(s):  
Yong Qiang Zhang ◽  
Jing Wang ◽  
Mei Ling Shi ◽  
Xiao Xian Zhao
Keyword(s):  
Aqueous Solution ◽  
Steady State ◽  
Flow Rate ◽  
Recovery Rate ◽  
Surfactant Concentration ◽  
Separation Efficiency ◽  
Enrichment Ratio ◽  
Feed Flow Rate ◽  
Experimental Conditions ◽  
Distribution Density Function

The purpose of this study is to recover molybdenum (VI) from aqueous solution with packed foam column by steady-state operation using hexadecyl trimethyl ammonium chloride as the surfactant. The parameters include air and feed flow rate, packing layer heights, surfactant concentration and pH etc, then the macroscopical dynamics is studied. The experimental results show that there are little effects of liquor pH, air flowrate and surfactant concentration on recovery rate and enrichment ratio of molybdenum within experimental conditions, but with increase of feed flow rate, recovery rate and enrichment ratio all decline clearly, with increase of packing height, recovery rate enhances evidently, and enrichment ratio decreases slowly. The macroscopical dynamics show that the process can be regarded as first order reaction. The fluid flow pattern is close to piston, indicating that there is little liquid backmixing and in favor of advancing separation efficiency by analyzing variance and distribution density function.

Effects of Microstructure Types on the Evaporation Efficiency of Electrically Heated Micro Evaporator

2013 ◽  
Vol 655-657 ◽  
pp. 1123-1126
Author(s):  
Shu Zhang Zhou ◽  
Rui Kong ◽  
Min Qiang Pan ◽  
Qiao Xia Yuan ◽  
Ting Bo Hou
Keyword(s):  
Flow Rate ◽  
Input Voltage ◽  
Microchannel Plate ◽  
Feed Flow Rate ◽  
Flow Rates

In this work, a laminated microstructure-plate electrically heated micro evaporator was proposed. The effects of microstructure types on the evaporation efficiency of electrically heated micro evaporator under different input voltage values and flow rates of water were investigated. It was indicated that the triangular microstructure plate presented the best evaporation efficiency regardless of the change of input voltage and feed flow rate. The nonuniform-distributed microchannel plate presented better evaporation performance than that of uniform-distributed microchannel plate, while the triangular microstructure plate presented higher evaporative performance than that of rectangular microstructure plate.

Characterization and Testing of Copper-Containing Catalysts for Dehydrogenation of Cyclohexanol to Cyclohexanone

2018 ◽  
Vol 18 (5) ◽  
pp. 63-69 ◽  
Author(s):  
V. I. Vanchurin ◽  
O. I. Karachenko ◽  
A. Yu. Petrov ◽  
I. V. Tarakanovsky ◽  
D. S. Dzhumamukhamedov ◽  
...  
Keyword(s):  
High Activity ◽  
Flow Rate ◽  
Feed Flow Rate ◽  
Main Attention ◽  
Flow Rates

Main characteristics of currently used industrial catalysts and an innovative catalyst MAK-K for dehydrogenation of cyclohexanol were compared. Main attention was paid to comparison of the activity and selectivity of MAK-K and the best catalyst H3-11 (BASF) at 220–270 °C and feed flow rate of 0.6–1.3 h–1. Similar behaviors were characteristic of both catalysts, the use of MAK-K being preferable at lower temperatures and higher feed flow rates. The MAK-K catalyst manufactured by LLC «NIAP-KATALIZATOR» was tested. The catalyst (1.4 m3) was loaded to a reactor for dehydrogenation of cyclohexanol at Shchekinoazot Co. and employed for more than 2000 h to demonstrate its high activity and selectivity. The catalyst was competitive against all the samples under study.

Impact of recycled effluent on the hydrolysis during anaerobic digestion of vegetable and flower waste

2008 ◽  
Vol 58 (8) ◽  
pp. 1637-1643 ◽  
Author(s):  
F. Lü ◽  
P. J. He ◽  
L. P. Hao ◽  
L. M. Shao
Keyword(s):  
Lactic Acid ◽  
Flow Rate ◽  
Degradation Rate ◽  
Solid Phase ◽  
Flow Ratio ◽  
Acid Fermentation ◽  
Flow Rates ◽  
Operation Stability ◽  
Lower Ratio ◽  
Butyric Acid Fermentation

Two trials were established to investigate the effect of recycled effluent on hydrolysis during anaerobic co-digestion of vegetable and flower waste. Trial I evaluated the effect by regulating the flow rate of recycled effluent, while Trial II regulated the ratio of hydrolytic effluent to methanogenic effluent, which were recycled to hydrolysis reactor. Results showed that the recirculation of methanogenic effluent could enhance the buffer capability and operation stability of hydrolysis reactor. Higher recycled flow rate was favourable for microbial anabolism and further promoted hydrolysis. After 9 days of hydrolysis, the cumulative SCOD in the hydrolytic effluent reached 334, 407, 413, 581 mg/g at recycled flow rates of 0.1, 0.5, 1.0, 2.0 m3/(m3·d), respectively. It was feasible to recycling a mixture of hydrolytic and methanogenic effluent to the hydrolysis reactor. This research showed that partially introducing hydrolytic effluent into the recycled liquid could enhance hydrolysis, while excessive recirculation of hydrolytic effluent will inhibit the hydrolysis. The flow ratio 1:3 of hydrolytic to methanogenic effluent was found to provide the highest hydrolysis efficiency and degradation rate of lignocelluloses-type biomass, among four ratios of 0:1, 1:3, 1:1 and 3:1. Under this regime, after 9 days of hydrolysis, the cumulative TOC and TN in the hydrolytic effluent reached 162 mg/g and 15 mg/g, the removal efficiency of TS, VS, C and cellulose in the solid phase were 60.66%, 62.88%, 58.35% and 49.12%, respectively. The flow ratio affected fermentation pathways, i.e. lower ratio favoured propionic acid fermentation and the generation of lactic acid while higher ratio promoted butyric acid fermentation.

scholarly journals Influences of CO2 Bubbling Types on Preparation of Calcite Nanoparticles by Carbonation Process

2017 ◽  
Vol 62 (2) ◽  
pp. 209 ◽  
Author(s):  
Mahmut Altiner
Keyword(s):  
Particle Size ◽  
Calcium Hydroxide ◽  
Flow Rate ◽  
Bubble Size ◽  
Flow Rates ◽  
Carbonation Process ◽  
Complete Reaction ◽  
High Production ◽  
Co2 Flow

This study investigates the comparison of influences of CO2 bubbling into the calcium hydroxide (Ca(OH)2) slurry through a microbubble generator (MBG) and an ordinary CO2 generator (OCG) on the preparation of calcite nanoparticles by a carbonation method. Each obtained precipitate was characterized using XRD, SEM and particle size analyses. During the carbonation process at each CO2 flow rates, it was determined that the MBG generates tiny bubbles whereas an increase in CO2 flow rates led to an increase bubble size when the OCG was used. The flow rate of CO2 was not an important parameter with using the MBG as calcite nanoparticles were prepared (<125 nm) at each CO2 flow rates. The necessary time for the complete reaction decreases with an increase in the CO2 flow rates through the MBG in comparison to the OCG. To produce calcite nanoparticles with a high production recovery in shorter times, the MBG should be adopted to the carbonation reactor.

Sign in / Sign up

Export Citation Format

Share Document