BD 95
The Alfa Laval range of centrifuges for the vegetable and animal oils refining industries is continuously updated to incorporate the advantages of current developments in materials, mechanical design and fluid dynamics.The BD 95 (BDPX 718CGV-14CERY/CERX) is a version of one of the units specially developed for biodiesel production. It is the second-largest machine in this range and is ATEX approved. It comes in two versions for two different process stages.
Product Description
Applications
- Separation of methyl ester and glycerol – BD 95X
- Washing of methyl ester – BD 95Y
Performance
The BD 95 is designed for a plant producing biodiesel fuel from up to 800 tons/day of vegetable oil. Below shows nominal capacities. Actual throughputs vary according to the type of oil to be treated.
Methyl ester/glycerol separation – 46,000 l/h
Methyl ester washing – 42,000 l/h
Standard design
The machine consists of a frame with a base that contains a horizontal drive shaft, worm gear, lubricating oil bath, and hollow vertical bowl spindle. The bowl is fixed on top of the spindle, inside the space formed by the upper part of the frame, the solids collecting cover, and the frame hood. The hood carries the liquid discharge system. All parts in contact with the process liquid are made of stainless steel.
The bowl is a solids ejecting disc type, with an automatic hydraulic operating system for “shooting”. The flameproof, standard electric motor is suitable for variable frequency drive. The BD 95X is designed for use in ATEX zones 1 and 2. The BD 95Y is designed for use in ATEX Zone 2, non-flammable process liquid.
Design features
The BD 95 is based on a unique, semi-hermetic design concept. The hermetic, bottom-fed inlet ensures a gentle, non-destructive acceleration of the feedstock up to full bowl
BD 95 speed. The outlets on the heavy and light phases are open, reducing the pressure drop across the separator. The feedpressure requirement of the machine is therefore low. The outlets are equipped with stationary paring discs for removal of the different phases under pressure. With the working environment in mind, the BD 95 is designed to operate at low noise levels. This is achieved by means of a rubber-damped bearing assembly, jacketed frame and an outer bowl design engineered for low wind noise.
Standard equipment
Each BD 95 comes complete with control unit, flameproof electric motor, inlet and outlet connections, auxiliary equipment, a spare parts kit and a set of tools.
Utilities consumption
| Electric power | max. 46 kW |
| Operating liquid during discharge | 10 l/h |
| Cooling water, jacket | 300 l/h |
| Cooling water, oil | 80 l/h |
| Sealing liquid | 100 l/h |
| Flushing liquid, per discharge | 25–30 l |
ATEX design codes
| BD 95X: EX II 2 G T4 X for zone 1 & 2 | Inert gas design |
| BD 95Y: EX II 3 G T4 X for zone 2 | Electrically protected |
Material data
| Bowl body, hood and lock ring | s.s. 1.4418 |
| Frame top part and hood | s.s. 1.4401 UNS 31600 |
| Frame bottom part | Cast iron |
| Gaskets and O-rings | Fluorocarbon rubber |
Technical Specifications
| Throughput capacity | max. 52 m3 /h |
| Bowl speed | 4,300 rpm |
| Bowl volume | 66 l |
| Sludge space | 17 l |
| Motor speed synchron. 60.7 Hz | 1,821 rpm |
| Motor power installed | 52 kW |
| Starting time | 6–8 min |
| Stopping time without brake | 80 min |
| Inlet pressure at 46 m3 /h | 300 kPa |
| Outlet pressure, methyl ester phase | min. 200 kPa |
| Outlet pressure, heavy phase | 800 kPa |
| Sound pressure | 78 dB(A) |
| Overhead hoist lifting capacity | min. 1,200 kg |