khan101
Petroleum
- Jun 21, 2004
- 111
Hello Forum,
We have a large number of disk stack centrifuges (Alfa Laval).
The feed containing the liquid and the solids is introduced to the rotating centrifuge bowl from the top via a stationary inlet pipe, and is accelerated in a distributor before entering the disc stack. The separation takes place between the discs.
The light phase moves through the disc stack towards the centre of the bowl, from where it is pumped out under pressure by means of a built-in paring disc.
The heavy phase is collected at the bowl periphery, from where it is continuously discharged through the nozzles. Filler pieces that avoid build-up of the sludge between the Nozzles can also be fitted.
A portion of the concentrated solids, discharged through the nozzles, can be recirculated into the bowl again through the recirculation inlet pipe, a separate distributor and the recirculation tubes. The bowl is mounted on a vertical spindle.
Now the problem is that these centrifuges are failing regularly. Some times when we put these machines on standby (without feeding them and on water only)the temp. gets too hot inside and as soon as we introduce feed (Hydrocarbon) there is a chance of explosion. There is no temp. indication for the inner bearing and we can not figure out how to install one (The whole assy. is inside the bowl which is rotating at 3600 rpm).
If any of you have any suggestion on how to measure temp. of the inner bearing, we will appreciate it.
Thanks.
p.s. For an illustration of how this thing works please click on the link below:
We have a large number of disk stack centrifuges (Alfa Laval).
The feed containing the liquid and the solids is introduced to the rotating centrifuge bowl from the top via a stationary inlet pipe, and is accelerated in a distributor before entering the disc stack. The separation takes place between the discs.
The light phase moves through the disc stack towards the centre of the bowl, from where it is pumped out under pressure by means of a built-in paring disc.
The heavy phase is collected at the bowl periphery, from where it is continuously discharged through the nozzles. Filler pieces that avoid build-up of the sludge between the Nozzles can also be fitted.
A portion of the concentrated solids, discharged through the nozzles, can be recirculated into the bowl again through the recirculation inlet pipe, a separate distributor and the recirculation tubes. The bowl is mounted on a vertical spindle.
Now the problem is that these centrifuges are failing regularly. Some times when we put these machines on standby (without feeding them and on water only)the temp. gets too hot inside and as soon as we introduce feed (Hydrocarbon) there is a chance of explosion. There is no temp. indication for the inner bearing and we can not figure out how to install one (The whole assy. is inside the bowl which is rotating at 3600 rpm).
If any of you have any suggestion on how to measure temp. of the inner bearing, we will appreciate it.
Thanks.
p.s. For an illustration of how this thing works please click on the link below:
