Feed of a Cyclone separator has 3 components, they are steam, moisture and STPP(Sodium Tri Poly Phosphate). To find Inlet duct area I'm having formula, A= inlet gas flow rate (kg/s)/(inlet duct velocity(m/s)*inlet gas density(kg/m3)). STPP is granular . For calculating the density, velocity and flow rate in above formula whether I need to include density, velocity and flow rate of STPP too. can anyone please explain how to calculate these three things for the above three components coming as feed.
@117 deg Celsius feed,
Water vapour(6.03kg/h;0.554kg/m3)
steam(0.915 kg/h;1.026kg/m3)
STPP(1.042kg/h;2520kg/m3)
If it is a "dirty" gas stream you will have to use a S-Type pitot tube which is calibrated. You will have to take your measurements upstream of the cyclone because the inlet may present problems in getting an accurate reading. Use the upstream flow rate along with the molecular weight (see below) to find the mass flow rate. You can then convert the flow rate for any changes in temperature, pressure, etc., in order to find a new volumetric flow rate at the cyclone entrance. Use this data along with the dimensions of the cyclone to find the cyclone inlet velocity, etc.
For the density, you will need to know the molecular constituents, not only the water vapor concentration. Use an Orsat device to find the CO, CO2, O2, and the N2 by difference (this assumes the gas is from a combustion process), along with the water vapor percent to then calculate the flue gas molecular weight. Then use the Ideal Gas Law to find the density.
Dear Santosh,
First of all you find out average density of the gas mixture as following,
Av. Density p =(p1v1 + p2v2 + p3v3)/(v1 +v2 +v3)
Where p1, p2,& p3 are the density of water vapour ,steam & STPP respectively.
And, v1, v2, & v3 are volume of water vapour, steam & STPP respectively.
Then applied formula as you discussed. After that, convert the flow rate for any changes in temperature, pressure, etc., in order to find a new volumetric flow rate at the cyclone entrance. Use this data along with the dimensions of the cyclone to find the cyclone inlet velocity where you want to calculate. The cyclone entrance cross section is either rectangular or circular. Take dimension for area of cross section to find out velocity. Find out Reynolds number. The characteristic velocity v can be defined for gas cyclones in various ways but the simplest and most appropriate definition is based on the cross-section of the cylindrical body of the cyclone, so that:
Velocity= 4Q/πD2
Where Q is the gas flow rate and D is the cyclone inside diameter.
Please find attached herewith related articles.
Regards,
Prem Baboo
Hi,
In this day and age of computing and transparency; why don't you use some online software which can not only calculate the required data but also optimize and give suggestions for it.
Here are a few links for your reference:-
Regards
Binoy Shah
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