Calcination Process
AssigneeOrigen Power Ltd
InventorsBarrie Jenkins, Christine Bertrand
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Abstract
There is provided herein a process for producing metal oxide in a flash calciner, the process comprising: a. pre-heating a metal carbonate particulate stream, prior to the particulate stream being fed into the flash calciner; and, b. calcining the particulate stream in a flash calciner to produce a raw stream comprising metal oxide and a flue gas comprising CO2, wherein at least a portion of the flue gas comprising CO2 produced in step (b) is used to pre-heat the metal carbonate particulate in step (a).
Claims30
A process for producing metal oxide in a flash calciner, the process comprising:
- a. pre-heating a metal carbonate particulate stream, prior to the particulate stream being fed into the flash calciner;
- and,
- b. calcining the particulate stream in a flash calciner to produce a raw stream comprising metal oxide and a flue gas comprising CO2,
- wherein at least a portion of the flue gas comprising CO2 produced in step (b) is used to pre-heat the metal carbonate particulate in step (a);
- and
- wherein at least a portion of the flue gas comprising CO2 produced in step (b) is recycled back into the flash calciner via a furnace.
A process for calcining a metal carbonate feedstock within a flash calciner to produce a metal oxide and flue gas comprising CO2, wherein the process comprises recirculating a least a portion of the CO2 flue gas at a pressure above atmospheric pressure within a closed loop fluid path which includes the flash calciner.
A process for calcining a metal carbonate feedstock within a flash calciner to produce a raw stream comprising metal oxide and a flue gas comprising CO2, wherein the process comprises recirculating and feeding a portion of the flue gas comprising CO2 back into the flash calciner via a fluid path which includes a preheater furnace which heats the flue gas comprising CO2 to a temperature capable of maintaining auto-ignition of a fuel within the flash calciner.
A calcination plant comprising:
- a flash calciner arranged to calcine a metal carbonate particulate stream;
- a cyclonic heat exchanger system coupled to the flash calciner and configured to feed the metal carbonate particulate stream into the flash calciner,
- wherein a flue outlet of the flash calciner is coupled to an inlet of the cyclonic heat exchanger system such that in use, at least a portion of the flue gas produced by calcination of the metal carbonate particulate stream is used to pre-heat the metal carbonate particulate in the cyclonic heat exchanger system;
- wherein a flue outlet of the cyclonic heat exchanger system is coupled to a flue gas inlet of the flash calciner such that a flue gas recycle loop is formed,
- and further comprising a furnace between the cyclonic heat exchanger system and the flash calciner, wherein the furnace comprises an inlet for receiving oxygen and fuel, an inlet for receiving flue gas from the cyclonic heat exchanger, and an outlet for releasing heated flue gas to the flash calciner.
Dependencies are inferred from the claim text.