Dave Dickey Forum Moderator 292 Posts
Re: What if we can't use a top-mounted mixer?17 August 2011 at 1:29pm
A mixer for this application sounds nearly impossible. If a mixer cannot be mounted on the top, then the next option is a side-entering mixer on one or both ends. Such a mixer must have a submerged seal that will tolerate 600 to 700 deg C. A seal for such high temperatures needs to be cooled and may encounter wear from the waste. Even a submerged mixer must be selected to avoid interference with the internal heaters.
The only other option that seems reasonable is a pumped recirculation loop, withdrawing waste from one end of the tank and returning the flow to the other end. With that arrangement, additional heating could be provided by a heat exchanger in the recirculation loop. A pump operating at those temperatures in a waste material is also going to encounter seal problems.
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We have a closed U trough, capacity 8 cu.m with internal and external electric heaters to heat solvent waste and recover the solvents. In this circuit it took us a long time to finish one batch (10-12 hours), since we don't have any rotating parts inside the U trough. Solvent waste will be stationary. We are recovering 30% solvent/batch. To reduce the batch time, we planned to agitate the solvent waste to get the effective heat transfer. We are not able to put the agitator on top cover to agitate the internal area. It took a long time to open the top cover and clean the waste. Also, to remove the solvent waste after completion of one batch, this reactor is designed to tilt and clean the waste. Operating Pressure: 2 psi g Operating Temperature: 600 -700 deg C
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