Chemical Engineering Science 1981 Vol 15 pp 303 to 309 Performance and design of hydrocyclones II Pressure drop in the hydrocyclone K RIETEMA Koninklijke/Shell
Hydrocyclone is a device for multiphase fluid separation using the centrifugal sedimentation principle With high operational efficiency excellent miniaturization and low maintenance cost it has been widely applied in coal Ni et al 2019 Dou et al 2020 petroleum Liu et al 2022 and municipal sewage and sludge treatments Gemza et al 2022 Li et al
Hydrocyclone has a history of about 129 years It has been used in various industries including mineral chemical coal petroleum papermaking environmental protection soil remediation waste management agriculture aquaculture food biotechnology nanotechnology material science technology and thermal energy due to its high separation
pressure forces inertial forces = P ˆ f v2=2 For a cyclone the characteristic velocity v = 4Q ˇD2 cyc P = pressure drop from inlet to over ow [Pa] v = characteristic velocity not inlet velocity [ 1] ˆ f = density of uid [ 3] Q = volumetric feed ow rate [ 1] D cyc = cylindrical section diameter of cyclone [m] 0 02 <D cyc <5 0 m
It is interesting to note that by using a rib in the cylindrical part of the hydrocyclone resulted in lower pressure drop and improved separation efficiency The pressure drop decreases by % and total efficiency increases by % at a feed velocity of 5 m/s and at a vortex finder depth of cm Pressure drop and separation efficiency
The efficiency of the hydrocyclone is influenced by pressure drop geometrical parameters and feed size distribution To increase the output of the hydrocyclone optimization of the geometry of hydrocyclone plays a vital shows that reducing the air core improves the separation efficiency of the hydrocyclone By
Stairmand high efficiency cyclone The cyclone was pilot plant scale with a design air flow of m3/s 300 cfm Collection efficiency and pressure drop were measured over a range of air flows at ambient tempera ture and pressure An oil mist was used as a test aerosol because it consisted of spherical drops of uniform density
The pressure drop over the axial hydrocyclone is significantly lower than that of the reverse flow hydrocyclone The pressure loss was found to be and kPa for axial hydrocyclone whereas the reverse flow hydrocyclone has a pressure loss of 60 and kPa for particle concentrations of % and % respectively
In order to save energy a Reducing Pressure Drop Stick Repds was installed in a new hydrocyclone to reduce the pressure drop The flow field was disturbed by the introduction of the Repds and
Two identical 10 mm hydrocyclone connected in series for improving particle separation efficiency is studied using two particulate samples The operating variable effects such as feed rate split ratio and pressure drop through hydrocyclones on the separation efficiency energy loss and outlet particle concentration are thoroughly discussed Some empirical
Multi inlet cyclone separators can play a vital role in industrial processes by enhancing particle separation efficiency and minimizing energy consumption This numerical study investigates multi inlet cyclone separators to enhance their performance using a constant flow rate with a varying inlet height and width By systematically varying the inlet height and
study on the change in pressure drop across the hydrocyclone and the latter s separation characteristics has been absent If all other operational parameters remain constant an increase in feed concentration will usually result in coarser cut size decreased separation sharpness and increased pressure drop
Semantic Scholar extracted view of "Experimental study of the drag reduction and separation efficiency for a new hydrocyclone with a Reducing Pressure Drop Stick" by Lian ze Wang et al {Experimental study of the drag reduction and separation efficiency for a new hydrocyclone with a Reducing Pressure Drop Stick} author={Lian ze Wang and Ji
Initially researcher Changirwa et al 1999a Changirwa et al 1999b separated oil solids water mixture by series connection of two hydrocyclone for solid liquid and liquid liquid separation proposing four stages of hybridization process was shown in Fig the turbulence of the former hydrocyclone may impact upon the feed stability and efficiency of the
Pressure drop = 10 psi The base d 50 c can be estimated by the expression d 50 c base = C Viscosity more efficient size separations Since ultrafine by pass is not related to the actual separation of particles based on the applied forces within the cyclone the effect of ultrafine by pass on the Actual Partition curve
The comparison of pressure drop and separation efficiency obtained from the present numerical study with the above mentioned results are shown in Fig 4 respectively It was obvious that the predicted results are in good agreement with the experimental data of Zhao et al [ 26 ] and numerical results were given by Siadaty et al [ 23 ]
PDR Pressure drop ratio PT Pressure transmitter Q Volumetric flow rate Q scale Factor to scale axial velocity distribution to satisfy mass balance R Radius S Hydrocyclone element u Control valve opening degree U d Slip speed between water and oil droplet V Control valve Y z ˆr Axial velocity distribution Subscripts b Back pressure
The interaction effect between feed size distribution FSD and underflow orifice diameter D u is crucial for the adjustment of the hydrocyclone in plant but not clearly paper presents a numerical study on effects of FSD on separation performances of hydrocyclones at a wide range of D numerical results show that both small or large D u will cause
The pressure drop decreases by % and total efficiency increases by % at a feed velocity of 5 m/s and at a vortex finder depth of cm Pressure drop and separation efficiency also
For a hydrocyclone to work at peak efficiency the volume of slurry and the feed pump delivery pressure must remain constant If the cyclone feed pump is allowed to SURGE the up and down pressure will cause poor separation at the point of high and low operating pressure There is a cycle to a surging pump box that causes this pressure First the pump
Since the relationship between the partial separation efficiency and Stokes number is known in Fig 8 the η/Stk values under the Stk > condition and a fixed pressure drop of MPa for the first hydrocyclone are plotted against ϕ in Fig 9 to understand the split ratio effect on the partial separation efficiency
Thereafter several empirical and theoretical hydrocyclone models were used for prediction of hydrocyclone performance The survey data revealed poor performance of the grinding circuit caused by a circulating load higher than the design size separation efficiency and pressure drop This section gives an overview on such models which are
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