Posted by Scott in SF on January 30, 2014 at 09:43:07 from (107.214.146.179):
In Reply to: Coal for heat. posted by oldtanker on January 30, 2014 at 07:14:37:
Rick, I don't think you will find a residential coal heating unit with any sort of emission control system. Any such thing would be expensive and labor intensive, and require a lot of electricity to run. The acid gas emissions combine with water to form a very corrosive product, acid rain is an example. Chemically it is SO2+H20=H2S04. The water in the scrubber would have to he highly caustic (chemically the opposite of acid) something that presents its own danger (think anhydrous ammonnia) and a Electostatic Precipitator (ESP)to knock out an residual particulates. Then, if we could even get it to work, we turned our air quality problem in to a solid hazardous waste one. All of this stuff would have to be built with highly crossive resistant materials. None of this is going to be cheap or easy. That, and the cost of natural gas is why all theas old coal fired plants are being shut down. (career tip for youngsters: become a wizzard at asbestos, hazardous waste, industrial demmolition and metal recycling, it is going to be a growth industry for the next 30 years) And as others mentioned it would do nothing to knock out heavy metals like mercury.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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