- #1
Tucker
- 6
- 0
Hi,
I'm going to school for mechanical engineering and I am interning at a water filtration company. I always come here for help on hw, and I see it as a good source of using my references available, so why not come for real life problems too?
Here is the situation:
I need to transfer powder activated carbon from a 1,000lbs carbon bulk bag from point A to point B, a storage tank about 20 feet in the air vertically, horizontally no more than a couple of feet. We do not use the whole bag in one sitting, depending on the recipe we take anywhere from 10-300 lbs at a time accurate to about .25-.5 of a pound. Currently we put the bulk bag on a scale and zero it out, then use a water venturi vacuum to suck up the carbon and watch the scale for the desired amount (example 100 lbs, suck until scale says -100). The reason the water venturi is a good idea is because the carbon is EXTREMELY dusty, and mixing it with water eliminates the dust.
The problem is the vacuum does not have enough power. I have looked into many options such as other industrial powered vacuums, but the filters would clog instantly because the carbon is so cakey and corrosive. I have also looked at bulk bag unloading systems designed just for this purpose... However, they are more so designed with the intension for the bag to stay on until it is empty, whereas like I said we only need X amount from the bag and then switch it with a different bag (about 8 different kinds of carbon bulk bags that we have). So it would be inefficient to put one on, install it, vacuum, and then switch it out for another. They are also very expensive and we are limited on space, so purchasing multiple systems is not an option.
So, as of now I’m trying to stick with the water venturi system. It is simple; no moving parts so maintenance free, and eliminates our dust problem. For those who do not know how the venturi works is it sends high pressure water through a nozzle. Due to the decrease in diameter of the nozzle in order for the water to continue flowing, the velocity is increased, while the pressure is decreased. Thus the decrease in pressure creates a vacuum, which is then used to suck up the carbon. Currently the inlet pressure is about 25psi and the outlet pressure is 2.5 psi. To my understanding, the larger the change in pressure, the stronger the vacuum.
1. Ideas that I have had and read about to strengthen this is to replace the nozzle with hopefully a more efficient on (tighten outlet diameter for increased velocity/greater decrease in pressure) and perhaps the one we have had on there for years is clogged/corroded.
2. Also thinking of adding in a bypass in the mainline right before the nozzle. When the valve is opened it will act as a pressure differential and further decrease the pressure.
3. Adding in a pump before the nozzle in an attempt to build more pressure for the inlet (currently 25 psi) for a greater overall decrease in pressure, thus more suction.
I am looking either for ways to replace this system or comments on improving the current venturi system or whether you think my ideas would really be enough to make a significant difference.
Thanks,
~Tucker
I'm going to school for mechanical engineering and I am interning at a water filtration company. I always come here for help on hw, and I see it as a good source of using my references available, so why not come for real life problems too?
Here is the situation:
I need to transfer powder activated carbon from a 1,000lbs carbon bulk bag from point A to point B, a storage tank about 20 feet in the air vertically, horizontally no more than a couple of feet. We do not use the whole bag in one sitting, depending on the recipe we take anywhere from 10-300 lbs at a time accurate to about .25-.5 of a pound. Currently we put the bulk bag on a scale and zero it out, then use a water venturi vacuum to suck up the carbon and watch the scale for the desired amount (example 100 lbs, suck until scale says -100). The reason the water venturi is a good idea is because the carbon is EXTREMELY dusty, and mixing it with water eliminates the dust.
The problem is the vacuum does not have enough power. I have looked into many options such as other industrial powered vacuums, but the filters would clog instantly because the carbon is so cakey and corrosive. I have also looked at bulk bag unloading systems designed just for this purpose... However, they are more so designed with the intension for the bag to stay on until it is empty, whereas like I said we only need X amount from the bag and then switch it with a different bag (about 8 different kinds of carbon bulk bags that we have). So it would be inefficient to put one on, install it, vacuum, and then switch it out for another. They are also very expensive and we are limited on space, so purchasing multiple systems is not an option.
So, as of now I’m trying to stick with the water venturi system. It is simple; no moving parts so maintenance free, and eliminates our dust problem. For those who do not know how the venturi works is it sends high pressure water through a nozzle. Due to the decrease in diameter of the nozzle in order for the water to continue flowing, the velocity is increased, while the pressure is decreased. Thus the decrease in pressure creates a vacuum, which is then used to suck up the carbon. Currently the inlet pressure is about 25psi and the outlet pressure is 2.5 psi. To my understanding, the larger the change in pressure, the stronger the vacuum.
1. Ideas that I have had and read about to strengthen this is to replace the nozzle with hopefully a more efficient on (tighten outlet diameter for increased velocity/greater decrease in pressure) and perhaps the one we have had on there for years is clogged/corroded.
2. Also thinking of adding in a bypass in the mainline right before the nozzle. When the valve is opened it will act as a pressure differential and further decrease the pressure.
3. Adding in a pump before the nozzle in an attempt to build more pressure for the inlet (currently 25 psi) for a greater overall decrease in pressure, thus more suction.
I am looking either for ways to replace this system or comments on improving the current venturi system or whether you think my ideas would really be enough to make a significant difference.
Thanks,
~Tucker