Fluidised bed pyrolysis apparatus and method
AssigneeUniversity of Pretoria
InventorsMichael David HEYDENRYCH, Ryan David MERCKEL
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Abstract
The invention provides a carbonaceous feed pyrolysis apparatus including two or more hot particle fluidised beds, and material transfer means for the transfer of hot catalyst particles between two or more of the beds, wherein one or more of the 5 fluidised beds is a gasifier which contains a gasification zone and one or more of the fluidised beds is a pyrolysis reactor which contains a pyrolysis zone, so that the particles are recirculated and serve as an energy carrier to drive pyrolysis in the pyrolysis zone. The invention extends to a carbonaceous feed pyrolysis process using said apparatus.
Claims21
1-64. (canceled)
A carbonaceous feed pyrolysis apparatus including two or more hot particle fluidised beds, and material transfer means for the transfer of hot catalyst particles between two or more of the beds, wherein one or more of the fluidised beds is a gasifier which contains a gasification zone and one or more of the fluidised beds is a pyrolysis reactor which contains a pyrolysis zone, so that the particles are recirculated and serve as an energy carrier to drive pyrolysis in the pyrolysis zone, which includes a char extraction device that removes char by overflow from the gasification zone.
A carbonaceous feed pyrolysis process including
- two or more hot particle fluidised beds wherein hot particles are transferred between two or more of the beds, wherein one or more of the fluidised beds is a gasifier which contains a gasification zone and one or more of the fluidised beds is a pyrolysis reactor which contains a pyrolysis zone;
- recirculating the particles so as to serve as an energy carrier to drive pyrolysis in the pyrolysis zone;
- purging some non-condensable gas which is produced in the recirculation pyrolysis gas loop and feeding purged gas to the gasifier or burning it in a combustor;
- controlling the flow rate of the purged gas in relation to the amount of biomass that is introduced into the pyrolysis zone which in turn determines the flow of gas between the gasification zone and the pyrolysis zone at the location where particles move from the gasification zone to the pyrolysis zone;
- burning the gas produced by the gasifier in a combustion zone that operates with excess air in order to completely combust all combustible species;
- adjusting oxygen flow rate to the combustion zone so that there is excess oxygen in the gas exiting the combustion zone;
- and
- estimating the oxygen flow rate by measuring CO2 concentration in the gas exiting the combustion zone thereby inferring excess oxygen.
Dependencies are inferred from the claim text.