Magh Bichar retort - 1 is a simple low-cost biochar making retort. In this design a two hundred liter steel drum is used. The top and bottom portions of the drum were cut open. One of the lids is used for covering the open side. The biomass is dumped into the drum and lit at the top and more biomass is added while it is still lit to fill it up to the brim. In TLUD condition the flame continuous. After some time the intensity of the flames lessen. Now the lid is placed over the flames and using soil the lid is sealed, so that no smoke is seen leaking out. Now the smoke appears at the pipe, which is attached through a connecting pit at the bottom of the drum. Leave it for more than 12 hours. The biochar continues to form and also the retort cools down. This second situation is the downdraft condition.
Note: Precaution should be taken to keep oneself as far as possible from the flames. The efficient production of the biochar also depends on the producers experience. For more details see http://maghbiocharretort.blogspot.com/
Magh Biochar Retort is demonstrated to the community under the GSBC Project. GEO is implementing the project with support of GoodPlanet, France.