COMBUSTOR FOR ND-TLUD (NATURAL DRAFT-TOP LIT UP DRAFT) BIOMASS GASIFIER COOK STOVE

摘要

The sole objective of this invention (combustor) is to considerably reduce harmful emissions from ND-TLUD biomass gasifier cook stoves. Harmful emissions escaping from the stove flame are the result of incomplete combustion and contain harmful gases like carbon monoxide and fine black carbon particulate matter. Harmful emissions from biomass cook stoves adversely affect the health of cooks who operate these stoves. Blackening of the vessel bottom also happens when black tiny particulate matter from the flame gets deposited there. Also causes IAP (Indoor Air Pollution) when the stove is operated inside the house. Incomplete combustion also reduces the thermal efficiency of these stoves. In ND-TLUD stove, gases generated in the pyrolysis chamber (using primary air from the bottom) is enveloped by preheated secondary air (as shown in the attached drawing sheet 2 of 2) above the pyrolysis chamber, where the final combustion of the pyrolysis gases takes place. But the middle of the gas stream remains deficient in oxygen, leading to incomplete combustion of the gases. The role of the combustor is to provide a small quantity of preheated air in the middle of this gas stream (at the top of the pyrolysis chamber) to complete the combustion process, thereby reducing the harmful emissions considerably. Simultaneously the thermal efficiency of the stove also improves due to the completion of the combustion process. The material used for the construction of the entire combustor is stainless steel.