Powder dosing into a pressurized vessel
Powder dosing into a pressurized vessel
(OP)
Hello,
We feed powder into a vessel (vessel pressure slightly atm) through a funnel with a long pipe (7m length) and at times
due to the slight over pressure of the vessel, the powder is not strong enough to flow and is thrown out.
What are the possible solutions to depressurize this pressure before feeding into the vessel or to avoid such scenarios.
A pneumatic conveying system would be ideal but we dont want to go for a high end solution.
thanks
We feed powder into a vessel (vessel pressure slightly atm) through a funnel with a long pipe (7m length) and at times
due to the slight over pressure of the vessel, the powder is not strong enough to flow and is thrown out.
What are the possible solutions to depressurize this pressure before feeding into the vessel or to avoid such scenarios.
A pneumatic conveying system would be ideal but we dont want to go for a high end solution.
thanks





RE: Powder dosing into a pressurized vessel
What are the dimensions of the vessel, amount of powder charged, exact pressures?
RE: Powder dosing into a pressurized vessel
Since the powder is very fine, there is a huge volume of air purging upwards and spraying the powder all over the floor. We tried to create enough vacuum to feed in, still its not helping.
RE: Powder dosing into a pressurized vessel
RE: Powder dosing into a pressurized vessel
RE: Powder dosing into a pressurized vessel
Presumably there's some air feed or sweep on the tank, or it would eventually depressurize itself through your funnel/hose.
More questions than answers here, some more details would help clarify the situation.
RE: Powder dosing into a pressurized vessel
RE: Powder dosing into a pressurized vessel
https://www.youtube.com/watch?v=7l89Ho1m9-w
RE: Powder dosing into a pressurized vessel
thanks for your replies, i believe so with a slight N2 pressure, it could be resolved. Also, the vented rotary valve with a lock/hopper system, needs to be checked. But since its a Zone 0 classified we need to make sure the effective solution complies within the scope.
bye
RE: Powder dosing into a pressurized vessel
RE: Powder dosing into a pressurized vessel
You may be right, but it's not clear to me why or what (gas) is causing this ---> "at times
due to the slight over pressure of the vessel, the powder is not strong enough to flow and is thrown out."
What if the RX is inerted and the inert gas is causing this? What if the powder has no contained oxygen? How do they guarantee during the powder transfer that air (oxygen) is not transported into the RX too?
I think the OP needs to clarify some of these details, but you do have a very, very good point!
Good luck,
Latexman
To a ChE, the glass is always full - 1/2 air and 1/2 water.
RE: Powder dosing into a pressurized vessel
We are short details, but what has been described is potentially an accident waiting to happen.
RE: Powder dosing into a pressurized vessel
Let me add some more details. The vessel is normally at around 900 mbar abs pressure, the valve is located just above the vessel, connected to the dosing pipe (100mm) which is about 7m long, where we feed the fine powder through a hopper (during this process there is no reaction its only for stabilization), the volume of air, which is trying to leave the pipe while opening the valve, during the dosing is creating this dust/smoke during dosing, leaving the area sprayed with some powder on the floor. There is no inert gas or vapor causing this, its just the volume of air in the pipe trying to escape, and pushing the fine dust upwards.
RE: Powder dosing into a pressurized vessel
Good luck,
Latexman
To a ChE, the glass is always full - 1/2 air and 1/2 water.
RE: Powder dosing into a pressurized vessel
RE: Powder dosing into a pressurized vessel
Good luck,
Latexman
To a ChE, the glass is always full - 1/2 air and 1/2 water.
RE: Powder dosing into a pressurized vessel
RE: Powder dosing into a pressurized vessel
RE: Powder dosing into a pressurized vessel
Good luck,
Latexman
To a ChE, the glass is always full - 1/2 air and 1/2 water.
RE: Powder dosing into a pressurized vessel
RE: Powder dosing into a pressurized vessel
RE: Powder dosing into a pressurized vessel
The vessel is Zone 0 (under the circumstances when the lines are completely filled with the chemical substances), but in the process which i mentioned above, happens only, when the vessel is empty and the lines are drained completely. So it is Zone 0 during normal operation, where we dont expose any lines to atmosphere or Oxygen opening a valve.
RE: Powder dosing into a pressurized vessel
RE: Powder dosing into a pressurized vessel
http://www.ddpsinc.com/powderpump