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You are at:Home»Calculations in Clarification»Role of Bagacillo in vacuum filter | bagacillo cyclone Capacity Calculation

Role of Bagacillo in vacuum filter | bagacillo cyclone Capacity Calculation

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Bagacillo Screens, blower & Bagacillo Cyclone Sizing Calculation

In this article briefly discussed about bagacillo requirement for vacuum filters. Bagacillo screen, Bagacillo blower capacity requirement, Bagacillo transport line sizing and  Bagacillo cyclone design calculation.

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  • Role of bagacillo in mud treatment process of vacuum filters:
  • Bagacillo screens 
  • Bagacillo Blower and its pipeline:
  • Bagacillo Cyclone :
    • Bagacillo screen, blower, pipeline, cyclone calculation

Role of bagacillo in mud treatment process of vacuum filters:

A fine fraction of bagasse termed bagacillo. It is used as a filter aid in the rotary vacuum filter station.  Bagacillo helps to form mud in a porous layer on the rotary vacuum filter drum. Due to porous nature we can easily extract the sucrose from the filter cake by wash water. Bagacillo must be very fine, smaller than 0.85 mm in diameter. The surface area of the filter aid is most important because the smaller in size greater will cover the area per kg of bagacillo. A common criterion for the bagacillo should be pass through 20 mesh screen with at least 85 % of the material and 4 mesh screen by least 80-90 % of the material.

Bagacillo quantity required  6 to 8 kg per tonne of cane.  While consider the wet filter cake then  6 to 10% of  bagacillo required on weight of filter cake.

Bagacillo screens 

Generally, bagacillo screens are perforated plates with holes of 5 to 10 mm in diameter.  The best results have been achieved with the 5 mm hole dia screens or 4mesh. The quantity of bagacillo obtained from screens varies according to the cane preparation. (Preparatory Index of the milling section). The quantity of the bagacillo will furnish 60 to 135 kgs of bagacillo/m2/hr.

Bagacillo Blower and its pipeline:

Bagacillo extraction from the final bagasse and its transport from the bagacillo collection chamber to the mud mixer is an important for filter operation.  The quantity of bagacillo conveyed by the air with the help of a fan. The quantity of bagacillo produced can be controlled by regulating the amount of air admitted through the bleed line damper. As this is opened, less air is sucked through the separator and the quantity of bagacillo reduces.

The air required for bagacillo Pneumatic transport is 6 to 6.5  M3 of air will be required per kg of bagacillo. The velocity of air in the duct line is generally considered 2 to 3m/sec. The velocity considered for bagacillo transport pipeline sizing is 15 to 20 m/sec. The MOC of the pipeline used GI or PVC.

Bagacillo Cyclone :

The purpose of the bagacillo cyclone is to separate bagacillo or pith from an air stream. The Particles having more than 5 µm can usually be separated from a gas stream. In general, a smaller diameter cyclone gives a higher pressure drop and a higher collection efficiency.

The pressure drops throughout the cyclone owing to several factors:

  1. Gas expansion.
  2. Vortex formation.
  3. Friction loss.
  4. Changes in kinetic energy.

Here given a simple design for bagacillo cyclone design calculation. ( This geometry is recommended by Perry and Green )

Bagacillo Screens, blower & Bagacillo Cyclone Sizing Calculation

The diameter of the cyclone:  Q = 1.9 d2.

Here  Q is volumetric flow expressed in M3/sec &  the ” d ” cyclone diameter in mtrs.

Provide the tangential rectangular entry for the inlet line of cyclone separator. The tangential entry length (b2) and width(b1) required d/2 & d/4 respectively.

The cylindrical height of the cyclone L1 = 2d and reducer length (L2) also to be take 2d. So total length of the bagacillo cyclone is 4d (Except air vent line).

The bottom dia (d4) of the cyclone is d/4.

The air vent line dia (d2) is to be consider d/2.

The inserted length (L3) of air vent into the cyclone is to be consider 5d/8.

Take one example for better understanding purpose.

Take the 230TCH plant, Calculate bagacillo screen, bagacillo blower and its pipe line capacity requirement and also find the suitable size of bagacillo cyclone.

Bagacillo screen, blower, pipeline, cyclone calculation

S.No Description  Values UOM  Remarks
Required Data
1 Plant Capacity 230 TCH TCH
2 Bagacillo requirement 7 Kg/TCH Ba
3 Bagacillo obtained from screen 60 kg/m2/hr. Bs
4 Air requirement for transportation of Bagacillo 6.5 M3/ kg of bag. Bt
5 Velocity in air duct line 3 m/sec Vo
6 Velocity in Bagacillo transport line 20 m/sec V
7 Bagacillo density 120 kg/m3 ρ
Calculation Part
1 Bagacillo requirement 1610 Kg/ hr TCH x Ba
13.417 M3/hr TCH x Ba/ ρ
0.0037 M3/sec
2 Bagacillo screen required 26.8 m2 TCH x Ba / Bs
3 Bagacillo blower capacity 10465 M3/hr TCH x Ba x Bt
2.9069 M3/sec Qa
4 Air duct line size for blower 0.969 m2 Qa/Vo
1.111 mtr
5 Air + Bagacillo Quantity 2.9107 M3/sec Q
6 Bagacillo transport line size 0.1455 m2 A =  Q / V
430.57 mm
7 Bagacillo cyclone Dia 1.2377 mtr d = sqrt( Q/1.9)
To be take 1200 mm
8 Tangential rectangular entry length 600 mm b2 = d/2
9 Tangential rectangular entry width 300 mm b1 = d/4
10 Cylindrical height of the cyclone 2400 mm L1 = 2d
11 Reducer Length of the cyclone 2400 mm L2 = 2d
12 Bottom dia of the cyclone  300 mm d4 = d/4
13 Air vent line dia 600 mm d2 = d/2
14 Inserted length of air vent into the cyclone 750 mm L3 = 5d/8

Role of Bagacillo in vacuum filter | bagacillo cyclone Capacity Calculation

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Hello everyone! Thank you for taking the time to read about Bagacillo Cyclone Capacity Calculation. I hope you found the content valuable. Your feedback and comments are welcome, so please share your thoughts. If you think this information could benefit others, please share it!

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