Gas conditioning system
The present invention provides a gas conditioning system for processing an input gas from a low temperature gasification system to an output gas of desired characteristics. The system comprises a two-stage process, the first stage separating heavy metals and particulate matter in a dry phase, and the second stage including further processing steps of removing acid gases, and/or other contaminants. Optional processes include adjusting the humidity and temperature of the input gas as it passes through the gas conditioning system. The presence and sequence of processing steps is determined by the composition of the input gas, the desired composition of output gas for downstream applications, and by efficiency and waste minimization.
1. A gas conditioning system for conditioning an input gas from one or more locations within a gasification system, the one or more locations including a gasifier, to provide a conditioned gas, said gas conditioning system comprising:
a. a first gas conditioner comprising one or more particle removal units for removing particulate matter from the input gas received from the gasifier in a first conditioning stage to provide a conditioned gas and removed particulate matter;
b. a solid residue conditioner, distinct from the gasifier, comprising a heat source and configured to receive, heat and process for receiving and processing said removed particulate matter to produce a secondary gas and solid waste; and
c. a second gas conditioner operatively associated with said solid residue conditioner, said second gas conditioner comprising a gas cooler and one or more further particle removal units for removing particulate matter from said secondary gas to provide a partially conditioned secondary gas, said second gas conditioner configured to pass said secondary gas through said gas cooler for cooling prior to entry of the secondary gas into the one or more further particle removal units and to pass said partially conditioned secondary gas to the first gas conditioner for further processing.
2. The gas conditioning system according to claim 1 , wherein said first gas conditioner further comprises one or more components downstream of said one or more particle removal units for implementing further conditioning of the input gas in a second conditioning stage to remove additional contaminants from the input gas.
3. The gas conditioning system according to claim 2 , wherein said one or more components comprise one or more components for acid gas removal.
4. The gas conditioning system according to claim 3 , wherein said one or more components for acid gas removal comprise an HCl scrubber.
5. The gas conditioning system according to claim 3 , wherein said one or more components for acid gas removal comprise an H 2 S removal system.
6. The gas conditioning system according to claim 2 , wherein said one or more components comprise a particle removal unit.
7. The gas conditioning system according to claim 6 , wherein said particle removal unit is an activated carbon mercury polisher.
8. The gas conditioning system according to claim 2 which outputs a conditioned gas suitable for use in a gas engine, and wherein the conditioned gas comprises carbon monoxide and hydrogen, and optionally nitrogen, methane and carbon dioxide, and comprises less than 20 ppm of H 2 S, less than 10 ppm of HCl, less than 17mg/Nm 3 of particulate matter and less than 190 μg/Nm 3 of mercury.
9. The gas conditioning system according to claim 1 , wherein said first gas conditioner additionally comprises at least one other component for implementing a dry phase processing step in said first conditioning stage.
10. The gas conditioning system according to claim 9 , wherein said component for implementing said dry phase processing step is a dry injection system.
11. The gas conditioning system according to claim 1 , wherein one of said one or more particle removal units is a baghouse filter.
12. The gas conditioning system according to claim 1 , wherein said converter gas conditioner further comprises a blower for moving the input gas through the gas conditioning system.
13. The gas conditioning system according to claim 1 , wherein said first gas conditioner further comprises a cooling unit upstream of said one or more particle removal units.
14. The gas conditioning system according to claim 1 , wherein said second gas conditioner further comprises a cooling unit downstream of the one or more further particle removal units, and an activated carbon bed downstream of said cooling unit.