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In C-Cyclones, dust laden gas enters the upper cylinder tangentially and moves down the conical section in a spiral path. The centrifugal force thus developed makes the dust particles move radially outward. They then strike the wall and drop out of the gas stream into the hopper. Clean gas flows out through central the exit tube.
Specific application parameters like the dust load, gas velocity, dust characteristics, particle size distribution and the overall system decide the optimum cyclone geometry and the internals. Factors such as length of the outlet tube inside the cyclone, length of the cylindrical portion, inlet and outlet areas, deflectors, length of conical portion etc. play an important role in determining the performance of the cyclone. Proper consideration of all these ensures high collection efficiency and very low emission levels, which is not possible in conventional cyclones.
For boiler applications it is possible to achieve emissions as low as 300 - 350 mg/Nm for agro-waste (husk) firing, which makes the C-Cyclones suitable as a final dust collector. This equipment from the was instrumental in providing an economical answer to the problem of handling fly-ash in husk fired fluidised bed boilers in the Punjab-Haryana belt, when norms of the above order were first introduced.
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TYPES OF C-CYCLONES |
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With increasing gas volumes, it is difficult to obtain the desired dust collection efficiency in a single cyclone construction. We can configure high efficiency cyclones into various versions - twin (two cyclones), quad (four cyclones) and double quad (eight cyclones) with the help of computer aided simulations to achieve higher efficiencies.
Optimization of dimensions to ensure maximum efficiency remains the basic approach in the final selection of any of these versions. Application requirements and site conditions are other important selection factors that influence the choice of an appropriate version.
For special applications like the fertiliser industry, individual collection hoppers with each cyclone in twin/quad version are provided instead of common hoppers. This prevents dust re-entrainment and facilitates free dislodging of dust from the hoppers. Dust discharge is affected through a motorized leak proof double flap dump valve or a rotary air lock valve.
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