When customers see the LY-200 for the first time, the obvious question is usually how 40 sets of filter frames can be arranged in it. The layout is only the outward appearance; what really decides how much oil the machine can handle is the match between the number of filter frames, the size of a single frame, the filtration area and the delivery capacity of the pump.
The filtration area is calculated
The flow rate of the LY-200 is 4800 L/h and the motor power is 11 kW, with 40 sets of filter frames of 300×300. Going from a single frame of 200×200 to 300×300 multiplies the area by 2.25, and going from 10 sets to 40 sets multiplies it by 4. The two together put the total filtration area of 40 sets of 300×300 and 10 sets of 200×200 in the ratio of 9. The filtration area decides how much solid contaminant the filter can take, and the power of the pump and the motor decides how much oil can be pushed through per unit of time. If the area is too small the filter paper is blinded quickly, the differential pressure rises and the flow falls; if the power is too low the flow cannot build up at all, because the oil has not yet filled the filter chamber.
How to choose the filter frame specification
- Large frames and deep chambers: suited to large-volume contaminants where a complete cake is wanted, because the cake lifts off in one piece and does not break up.
- Small frames and many sets: the filter chamber is shallow and each chamber takes little sludge, so a single chamber can be drawn out and changed while the others keep working.
- The filter paper and the cloth have to match the viscosity of the oil and the nature of the contaminants; for high-viscosity oil, choose a cloth with good liquid permeability.
Why the liquid content of the sludge holds up the next stage
What the plate and frame press separates out is the sludge, and the sludge inevitably carries some oil with it. A high oil content means that a considerable part of the oil has been left in the cake during filtration, which is the same as taking that part straight off the throughput. More troublesome still is that this oily sludge has to be dealt with: moving it and storing it both carry a risk of contamination, and if it is eventually discarded it means throwing away part of the oil together with the contamination. Once the filtration area is scaled up to 40 sets of 300×300, both the volume of the filter chamber and the distribution of the clamping force change, and the liquid content of the sludge varies with the clamping force, the material of the cloth and the nature of the contaminants in the incoming oil.
How it is positioned against the smaller plate and frame model
The LY-50 is a combination of 10 sets of 200×200, with a 4-1.5-b3 motor and a kcb33.3 oil pump; the specification is common, so spare parts are easy to obtain. The LY-200 has 40 sets of 300×300 and an 11 kW motor, and the open cabinet gives more room to draw out and fit the filter frames, which makes manual sludge removal more efficient; the chambers work independently, and servicing one chamber does not affect the others. The difference between the two is not only in size: one is oriented towards being available at any time with common spare parts, the other towards batch work and less downtime for sludge removal.
| Comparison | LY-50 | LY-200 |
|---|---|---|
| Filter frame configuration | 10 sets of 200×200 | 40 sets of 300×300 |
| Motor | 4-1.5-b3 | 11 kW |
| Oil pump | kcb33.3 | Matched to the 11 kW motor |
| Sludge removal | Screw clamping, the frames taken out one by one | Open cabinet with generous room to draw out the frames |
| Mode of operation | The other chambers keep working while one chamber is serviced | The chambers work independently, servicing one chamber does not affect the others |
The filtration area decides how much contaminant the machine can take, and the pump and the motor decide how much oil can be pushed through per unit of time; if the two do not match, the output does not come up.