We are discussing different types of wet scrubber designs for further gas clean up.
The two most common and accessible liquids for scrubbing are oil and water. I wanted to open a discussion here about the advantages and disadvantages of each and curious to what others have tried.
Water is readily available however it does require treatment before it can be discharged. While wood tars entrained in water do come from 'natural' biomass, it is not environmentally friendly to dispose of tarry water into the local watershed. Water will also be acidic due to contaminates in the water this will tend to accelerate corrosion in the tubes. Stainless steel scrubber housings have been recommended in this case.
Oil/Biodiesel has been used in large scale gasifiers as the liquid medium for gas scrubbers. As long as acidic water condensate does not form the scrubber housing can be a milder steel, and does not have to be stainless. The energy from the used oil can also be recovered in a boiler system.
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#2 Guest_solidwoods_*
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Posted 07 February 2013 - 02:34 PM
Howdy
My experience level -I'm just about to run my first engine from my gasifier.
My water filter is submerged in a tank of water, that warm water is sent to my greenhouse to a heat exchanger. I'm shooting for 100 deg gas temp out of the filter.
The filter tank is a 40gl hot water heater tank (prototype first ,, then SS).
Gas dispersal into the water is important to me, but for now I'll try just try sticking the gas in tube 1" into the water (which is 6" deep).
Managing the water level is important since it affects resistance to the system vacuum pressure.
To manage the water level, I'm trying the weight of a water column outside of the filter (open to atmospheric pressure) against the weight of the water under varying vac pressure the system achieves (1 column of water is under vac the other is not).
The cooled gas will yield water which will raise the water level on the outside tank and the excess will be overflowed into a container.
The excess water will be evaporated and the remaining soot? cake? I'll try running it back through the gasifier.
An advancement from the above would be to put the filter water through a Distillation Tube (it's a Still Yall). Because I'm guessing just open air evaporating of filter water would off gas some things (and maybe something that can go boom boom)
Water or oil.
I'm already not real happy with fly ash flitting around in gas that goes boom boom, so I'm thinking running fly ash through yet another flammable may prove some science that I wasn't prepared for or could exploit in a good way.
Yes I know fly ash should be one of the first things removed.
jim
My experience level -I'm just about to run my first engine from my gasifier.
My water filter is submerged in a tank of water, that warm water is sent to my greenhouse to a heat exchanger. I'm shooting for 100 deg gas temp out of the filter.
The filter tank is a 40gl hot water heater tank (prototype first ,, then SS).
Gas dispersal into the water is important to me, but for now I'll try just try sticking the gas in tube 1" into the water (which is 6" deep).
Managing the water level is important since it affects resistance to the system vacuum pressure.
To manage the water level, I'm trying the weight of a water column outside of the filter (open to atmospheric pressure) against the weight of the water under varying vac pressure the system achieves (1 column of water is under vac the other is not).
The cooled gas will yield water which will raise the water level on the outside tank and the excess will be overflowed into a container.
The excess water will be evaporated and the remaining soot? cake? I'll try running it back through the gasifier.
An advancement from the above would be to put the filter water through a Distillation Tube (it's a Still Yall). Because I'm guessing just open air evaporating of filter water would off gas some things (and maybe something that can go boom boom)
Water or oil.
I'm already not real happy with fly ash flitting around in gas that goes boom boom, so I'm thinking running fly ash through yet another flammable may prove some science that I wasn't prepared for or could exploit in a good way.
Yes I know fly ash should be one of the first things removed.
jim
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