Device with dilated oxidation zone for gasifying feedstock

摘要

A downdraft gasifier that utilizes a plurality of vertically positioned tubes to create a pyrolysis zone, an oxidation zone beneath the pyrolysis zone and a reduction zone beneath the oxidation zone. The shape of the tubes eliminates the need for a restriction (hearth), which limits the maximum achievable throughput. A rotating and vertically adjustable grate is located beneath, but not attached to, the reduction zone of the gasifier.

主权项

1. A gasifier comprising:
a plurality of conjoined and vertically positioned tubes having a proximal end and a distal end, wherein the proximal end provides an inlet and the distal end provides an outlet; at least three contiguous reaction zones comprising a pyrolysis zone, followed by an oxidation zone with a dilated middle that is a Kline-Fogelman step, followed by a reduction zone; and at least two separate rings of pressurized plano air inlets, configured to deliver adjustable volumes and pressures of oxidant streams, wherein the at least two rings of plano air inlets are located around the perimeter of the oxidation zone, further wherein at least one of the at least two rings of plano air inlets is located at the dilated middle, and further wherein the gasifier is a downdraft gasifier used for gasification of feedstock.