Plasma-assisted waste gasification system

摘要

A plasma-assisted waste gasification system and process for converting waste stream reaction residues into a clean synthesis gas (syngas) is disclosed. The feedstock is fed into a reactor roughly one-third from the bottom through the use of a feed mechanism. The reactor has three zones; a bottom zone where melting occurs, a middle zone where gasification takes place, and a top zone with integrated plasma torches to control the temperature and polish the syngas. The residence times in the three zones are selected to optimize the syngas composition and melted products. The syngas leaves the reactor and is partially quenched with relatively cooler synthesis gas. The partially quenched syngas is further cooled to recover heat for steam generation and/or preheating the waste stream to the reactor. The cold syngas is then processed to remove pollutants. The clean synthesis gas is combusted in power generation equipment to generate electricity, or converted to other fuels by chemical processes.

主权项

1. A plasma-assisted waste gasification system for converting a waste stream into a synthesis gas, comprising:
a reactor having three zones; a bottom zone for melting the waste stream reaction residues and forming a slag pool, a middle zone higher in elevation than the bottom zone for converting the waste stream into the synthesis gas, and a top zone higher in elevation than both the bottom zone and the middle zone and having at least one plasma arc torch for controlling a temperature of the synthesis gas and composition of the synthesis gas; and a feed mechanism for introducing the waste stream into the reactor.