Apparatus and methods for tar removal from syngas
View Patent ↗A process and apparatus are provided for reducing content of tar in a tar containing syngas. The process includes contacting the tar containing syngas with a molecular oxygen containing gas in a first reaction zone to produce a gas mixture. The gas mixture is passed through a heat treatment zone maintained at a temperature between about 900° C. to about 2000° C. for a contact time of about 0.5 to about 5 seconds. In this aspect, at least a portion of the tar undergoes at least partial oxidation and/or cracking to produce a hot syngas.
1. A syngas production apparatus comprising:
(a) a gasification zone wherein a carbonaceous material is contacted with molecular oxygen and optionally contacted with one or more of steam and carbon dioxide to produce a tar containing syngas;
(b) a first reaction zone wherein molecular oxygen is introduced and mixed with said tar containing syngas to produce a gas mixture, wherein the molecular oxygen is introduced into the first reaction zone through inlets that includes one or more gas inlets attached to the first reaction zone, each gas inlet being angled to a diagonal drawn through a point of intersection of a cross section and axis of the gas inlet; and
(c) a heat treatment zone for thermal treatment of tar contained in said tar containing syngas oxygen mixture, wherein the heat treatment zone includes a first heat treatment zone for thermal treatment of tar contained in the gas mixture to produce a less tar containing gas mixture; and a second heat treatment zone for thermal treatment of tar contained in said less tar containing gas mixture to produce hot syngas;
wherein the first reaction zone is positioned vertically between the gasification zone and the heat treatment zone;
wherein the first reaction zone and heat treatment zone have a size and position that allows tar containing syngas oxygen mixture from first reaction zone to change direction of flow by impingement on a surface of the heat treatment zone;
wherein said heat treatment zone has a size that provides a contact time of about 0.5 to about 5 seconds in the heat treatment zone;
wherein the heat treatment zone has a size that is a ratio of a linear velocity (meters/second) to height (meters) of the heat treatment zone of about 0.3:12.5 to about 2.0:2.5;
wherein the gas inlets in the first reaction zone are angled to provide the molecular oxygen opposite to a flow of gas through the first reaction zone.
2. The syngas production apparatus of claim 1 wherein the gas mixture from the first reaction zone impinges on a surface in less than about 2 seconds.
3. The tar removal apparatus of claim 1 wherein the gas mixture from the first reaction zone impinges on a surface in less than about 1 second.
4. The tar removal apparatus of claim 1 wherein the gas mixture from the first reaction zone impinges on a surface in less than about 0.5 second.
5. The tar removal apparatus of claim 1 wherein the gas mixture from the first reaction zone impinges on a surface in less than about 0.1 second.