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.
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:
- Gas expansion.
- Vortex formation.
- Friction loss.
- Changes in kinetic energy.
Here given a simple design for bagacillo cyclone design calculation. ( This geometry is recommended by Perry and Green )
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 |
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| 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 |
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