This project goes over the build of a simple gasification system that functions to produce wood gas for running a generator, a cooking stove and for lanterns. We feed the wood chips and other materials through the opening at the top of the gasifier ,the air also gets drawn in from the top .The air would drop through the wood mass, down to the reduction zone and gets collected down at the bottom of the tank through the output pipe .
The materials needed to build this down draft style gasifier are a 3 old propane tanks, old steel sheets, wood pellets.
The first step is to make sure that propane tanks are empty .Remove the handles from the top of the 3 propane tanks and unthread the valves.
Cut the top portion from 2 tanks and stack the body of the tanks on top of each other and weld it. One of the cut out top pieces can be used a lid .
The bottom portion of the lower tank is cut open to create the reduction zone of the gasifier. To make the reduction point, we take the scrap steel sheet and make a five inch wide small tube of the them and weld them to the bottom third propane tank .
The bottom five gallon propane tank is used as a ash bin where all the ash is going to get caught and as an outlet for all the gases coming out of the system. The top portion of this tank is cut in such a way that it fits the reduction zone collar of the secondary tank.
Make sure that both the tanks fits nicely together so that you can pull the inner chamber out of the bottom ash tank to remove it, dump the ash catch out and use it again and again.
The top of the upper tank is cut open .This acts as the feed area where all the wood pieces are dropped in.
We make a screen with holes using a 20mm hole saw cutter from the leftover cutouts of the propane tank. We are gonna mount this screen inside the gasifier lower reduction zone.
A hinge and a wire is attached to the screen so it can open and close. This gives us the ability so we can shake the screen if it plugs up with ash or other materials. The wire goes through the reactor up to the top .
We have a pressure relief system installed on the lid of the gasifier. If anything were to happen inside of the gasifier , the build up pressure can be made to escape through the top lid .This is done by hooking up two springs on both sides of the lid through small loops .The springs on both sides is attached to hand levers.
We drill 8 half inch diameter holes just above reduction zone area and put thick steel tubing through them to the center of the chamber. The airflow will go in and be drawn down through the center of the reduction zone that helps in efficient burn. The pipes are curved in to the chamber so that it does not interfere with any wood mass as it goes into the reduction zone. We add plugs along these 8 tubes to regulate the air flow into the system.
Next step is to add the draw fan to the gasifier. Here we use a pellet stove fan .We add a 2 inch plate over the face of the fan and a threaded pipe to seal any air going into the gasifier.
We start up the gasifier by putting some chopped wood through the top and use the fan to get the wood gas producing out of the bottom outlet pipe.
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- How to build a Simple Homemade Bandsaw Mill from Old Car WheelsThis project goes over the build of a simple Bandsaw from old car wheels .Car wheels are big and heavy, but in many ways, they are ideal for bandsaws. They are available everywhere cheaply. They have a rubber tire for the blade to sit on, and they have excellent bearings. Take apart the brakes, the backplate , bearings and the stub axle out of the housing. Weld the stub axle onto an off cut of scaffolding. So we now have two wheels, spinning on the ends of two straight lengths of steel. We take some scrap angle iron pieces and make a rectangular frame for the mill. This form as the base of our mill. In order to make the sliding mechanism, we take a scrap pipe and try to fit it onto a square iron pipe so it can slide in and out smoothly. This will be used for all adjustments. This is welded onto the frame. A Steel plate is welded onto the sliding bars. This is for the engine to sit on. The engine will drive one of the car wheels We mount the 11 HP Petrol Engine to steel plate and the tire is connected directly to the engine shaft through a drive belt. The drive wheel is bolted on to the frame ,also added a lever for the engine mount which will act as a sort of clutch, tightening and slackening the belt when necessary. We add two more pipes on the bottom of the frame and slid them to the support platform of the second wheel made from the same square box iron and some short sections which is part of the blade guide. The second wheel has to be adjustable in a few different directions and has to be lined up with the first wheel so the blade stays on them both without running off the tires. To adjust the tension on the blade by moving the wheel away from the first one, we use a bottle screw. The blade guides are made from cheap bearings. They needs to be adjustable so that the saw can cope with logs of different sizes. The blade guides help keep the blade straight as it goes through the log and also stops the plate being pushed off wheels The band saw has to go up and down so that it can cut planks from a log. We make a simple frame to hold it. It has to fit inside vertical pieces of angle iron on the saw. The support frame is bolted onto to the saw by using a bracket which grip the uprights. Couple of barn door pulleys are bolted onto the top of the support frame and the mill frame. A trailer winch is bolted on to the middle of the support frame. Using a 3mm wire and winch-pulley system, we can move the wheel frame up and down. Two short pipes are added at the front and these hold up a guard which can be taken off when we need to get at the belt or the blade. If the blade snaps, the side guards should make sure that it heads down towards the ground and not up to the ceiling. The saw is stationary and the log is moved through it using dolly trailers or rails. https://www.youtube.com/playlist?list=PL3_dJayH6e6ibBd5sA6WgXO99zf2zBsUe
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