Established in 1942
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Since 1942 Strommasina Corp. has been successfully producing equipment for the mining, building, oil and gas, as well as road, metallurgical industries.

СN15.Scheme

Cyclone. General information

  1. Conical section of the body
  2. Cylindrical section of the body
  3. Dust-laden gas inlet branch pipe
  4. Exhaust tube
  5. Treated gas chamber
  6. Hopper

Example of cyclone reference designation when ordering.
СN - 15-500*4UP,
wherein CN – cyclone type;
15 – inlet branch pipe slope angle against horizontal line, degree;
500 – inner diameter of cyclone cylindrical part, mm;
4 – number of cyclones in assembly;
У – with treated gas chamber (spiral case);
П – pyramid-shaped hopper.

Hydraulic resistance of a cyclones group

Hydraulic resistance of a cyclones group НЦ with spiral inlet and outlet of combustion gases without additional devices is calculated according to the formula:
НЦ=zЦГР*wЦ2*g0/{(1+t/273)*2*g}, mm. w.c.
wherein wЦ –nominal speed of gases in a cyclones body at flow temperature, m/s;
zЦГР - resistance coefficient of cyclones group.
zЦГР=К1*К2*155+28,
wherein К1 - correction index considering the influence of cyclone diameter;
К2 - correction index considering the influence of dust content.

 

 

 

 

Performance data of single and group cyclones

Index nameValue
Permissible dust content of gas, for slightly sticky dust, g/m3., not more1000
For medium-sticky dust, g/m3., not more250
Treated gas temperature, оС, not more400
Maximum pressure (vacuum), Pa, not more5000
Treatment efficiency from dust 10 micron, density 2,72 g/cm3., %80
Nominal speed in the cyclone body, m/s.     2,5 - 4

Cyclone operational scheme

Centrifugal force is applied in reversible flow cyclones that generates when progressive rotation of a gas stream. Under influence of centrifugal force, dust particles are brought to the cyclone wall   and together with part of gases enter the hopper. Part of gases entered the hopper and got free from dust return to the cyclone through central part of a dust-removing hole, originating the internal whirl of treated gas leaving the device. Particles separation from gases entered the hopper occurs at changing the gas movement direction by 180° under action of inertial force. While this gas section is moving towards the exhaust tube, some gas portions missing the hopper gradually join them. The latter does not result in significant dust discharge in the exhaust tube since gas migration distributed along the large distance of cyclone length occurs with the speed insufficient for counteraction to particles movement to cyclone periphery. Incomparably bigger influence on gas treatment completeness gives their movement in the area of dust removing hole towards the releasing dust.

This points to the fact that the cyclones are extremely sensitive to suction through hopper due to increase of gas volumes moving towards the dust. The hopper is involved in gas dynamics of a cyclone process, therefore the use of cyclones without a hopper or with them with undersized dimensions against the recommended leads to decline of the devices operation efficiency.

Nominal speed in cyclone body.

Nominal speed in cyclone body of "СN-15" type shall be within 2,5ё4 m/s. It is recommended to use nominal speed equal to 3,5 m/s when calculation.

Nominal speed in cyclone body is determined using the following formula:
wЦ=1,2733* VЦТ* /(D2* N), m/s
wherein D-cyclone diameter ;
N –number of cyclones in a group;

VЦТ – volume of treated gas at actual temperature m3/s.

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