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Blower Changes for Thermal Oxidizer Outlet

Blower Changes for Thermal Oxidizer Outlet

Blower Changes for Thermal Oxidizer Outlet

We are trying to convert our Regenerative Thermal Oxidizer to a Catalytic Thermal Oxidizer.  The pressure drop through the media beds will increase when the catalyst is added (I believe by 7 in. H2O).  For the blower that will transport this air to the outlet stack, would I just need to increase the static pressure on the blower curve by 7 in. H2O to find a new flow, then use the fan laws to find a new RPM setting?  I think are blower can handle the increase in speed.


RE: Blower Changes for Thermal Oxidizer Outlet

What type of an air moving device it is? A positive displacement blower or a centrifugal fan? PD blowers give you fairly constant flowrate irrespective of the pressure but your entire system should be designed to the new pressures. As power consumptions increases drastically, you should atleast change the motor.

With a centrifugal fan, you can approximately calculate the new RPM required by affinity laws.

SP1/SP2 = (N1/N2)2. This also increases the flowrate. You have to throttle the flow if you want a constant flowrate but this will push the blower operation to less efficient zones resulting in more power consumption. 7" is quite high a pressure and I would look for a chance of replacing the blower if economics help.


RE: Blower Changes for Thermal Oxidizer Outlet

If it is centrifugal then:
flow will increase linear with speed
Pressure will be square of speed
Power will be cube of speed.
But, the efficency will go down as the speed increases, so everything will get worse.

In otherwords, you need to find speed curves for the blower before you can see if it will work.  If this is an industrial unit there may be data for it at different speeds.  You also need to know its max speed.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

RE: Blower Changes for Thermal Oxidizer Outlet

How did you determine the increased pressure drop, considering the lower oxidation temperature you will get less pressure drop in the beds but if you adding catalyst on top this will of course add.
I don't know what media you are using but it should be possible to add catalyst without any increase at all by removing some of the old media.

What is the current DP for the RTO?


RE: Blower Changes for Thermal Oxidizer Outlet

Thanks for all of the replys,

The catalyst company was the one who retrofitted out RTO to a CTO and gave the increased pressure drop.  I agree with you, I read that the catalyst should decrease dP since you are running at lower T (less heat recovery needed).  I might ask the question to the company.  I don't have the quote in front of me, but I will give more data later if interested.

Thanks again

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