Biogas, Oars EffortsDraco 2 Gallery February 12, 2014 Bob Hamburg Leave a comment Urbanic’s System – Draco I I From just above the house site, across creek, and to site excavation. Urbanic’s System – Draco I I The base of the digesters with footings and rock mass for heat storage; formed for pouring floor. Urbanic’s System Draco II -Laying up block for greenhouse, digesters and retaining walls. Believing the gas-tight claims for fiberglass-reinforced B-bond, block was set dry, i.e. without mortar. (Another mistake!) Urbanic’s System Draco II -Block work done up to level of digester ceiling. B-bond plastered over both sides of all. Urbanic’s System Draco II – Digester ceilings formed for concrete pour; digester sides tarred and insulated; thermosiphons in place. Ceiling consisted of 4” reinforced concrete, 2” styrofoam, and another 2+” reinforced concrete. Urbanic’s System Draco II – Above digesters, pond baffles completed. Urbanic’s System Draco II – Inlet covers, stirring plunger and channel extension completed. Note secondary loading port covers and plunger for agitation. Urbanic’s System Draco II – Digester wall outside the greenhouse – insulated and covered for cold weather operation. Note covered entry port and used gas valve for emptying. Urbanic’s System Draco II – Greenhouse completed and the first winter’s mud. Urbanic’s System Draco II – Condensation traps, hydrogen sulfide scrubbers and gas meters in the gas Urbanic’s System Draco II -A second condensation trap at the line’s low point in the creek bed. Urbanic’s System Draco II -Loading one digester through the main port with stable bedding and manure. Urbanic’s System Draco II -Upon loading the digester with water, it was discovered that the B-bond was a major failure! Water streamed out of a few retaining bolts holding the greenhouse. In spite of its inhibition of desired heat flows, I had a thin layer of urethane foam sprayed over the entire inside of the digesters. Urbanic’s System Draco II – Manometers, pressure gauges, for both systems. Gas pressure is seen in different levels of orange water on one gauge. Urbanic’s System Draco II -Greenhouse use the first year. Urbanic’s System Draco II -The system from above. Pond extensions completed. (Note earthen bottom of extensions – I should have spread a couple inches of bentonite clay) Photovoltaic thermosiphon fans installed. Urbanic’s System Draco II -The completed system and driveways to digesters and house. Urbanic’s System Draco II -The system from above the house. I continue to maintain that I saw to the birthing of a few of the most attractive of digesters. Urbanic’s System Draco II – The system with added work area during its second summer.Share this:Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to email this to a friend (Opens in new window)