Method of treating a carbon dioxide rich flue gas and a flue gas treatment system
AssigneeGeneral Electric Technology GmbH
InventorOlaf Stallmann
Life of this patent
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Abstract
A method of treating a carbon dioxide rich flue gas and a flue gas treatment system for treatment of a carbon dioxide rich flue gas are provided. A boiler system includes a boiler, being operative for combusting a fuel and generating a carbon dioxide rich flue gas, and the flue gas treatment system. The flue gas treatment system includes a gas cleaning system, a nitrogen oxides reduction unit, being operative for reducing at least a portion of a nitrogen oxide(s) content of the flue gas, and a compression and cooling device being operative for pressurizing and cooling at least a portion of the flue gas treated by the gas cleaning system and the nitrogen oxide(s) reduction unit.
Claims15
A method of treating a carbon dioxide rich flue gas, the carbon dioxide rich flue gas further comprising contaminants, oxygen gas, water vapour, one or more nitrogen oxide(s), and, optionally, combustibles, wherein the method comprises:
- at least a portion of the contaminants comprised in the carbon dioxide rich flue gas is removed in a gas cleaning system to obtain a cleaned carbon dioxide rich flue gas;
- at least a portion of the cleaned carbon dioxide rich flue gas is heated in a gas-gas heater;
- at least a portion of the one or more nitrogen oxide(s) comprised in the heated and cleaned carbon dioxide rich flue gas is reduced in a nitrogen gas reduction unit to obtain a cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas;
- at least a portion of the cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas is sent to a gas processing unit, wherein the gas processing unit comprises a first pressurization stage, where the cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas is pressurized and cooled so that at least a portion of the water vapour comprised in the cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas is condensed;
- at least a portion of the cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas, after passing through the first pressurization stage, the pressurized, cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas is forwarded to a dehydration unit so that at least a portion of the water vapour present is adsorbed to, or absorbed by, a drying agent;
- and
- at least a portion of the cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas, after passing through the dehydration unit, is further pressurized and cooled in a second pressurization stage of the gas processing unit;
- wherein the method is devoid of condensation of carbon dioxide present in the carbon dioxide rich flue gas before the cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas is pressurized in the second pressurization stage.
A flue gas treatment system for treatment of a carbon dioxide rich flue gas, the flue gas treatment system comprising:
- a gas cleaning system being operative for removing at least a portion of a contaminant content of the carbon dioxide rich flue gas;
- a gas-gas heater, being operative for heating at least a portion of the cleaned carbon dioxide rich flue gas;
- a nitrogen oxides reduction unit, being operative for reducing at least a portion of a nitrogen oxide(s) content of the carbon dioxide rich flue gas;
- a gas processing unit comprising a first compression and cooling device and a second compression and cooling device, the first compression and cooling device being operative for pressurizing and cooling at least a portion of the cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas treated by the gas cleaning system and the nitrogen oxides reduction unit, so that at least a portion of a water vapour content comprised in the cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas is condensed;
- wherein:
- the first compression and cooling device comprises a dehydration unit being operative for adsorbing to, or absorbing by, a drying agent, at least a portion of the water vapour content present in the flue gas treated by the first compression and cooling device;
- the second compression and cooling device is operative for further pressurizing and cooling at least a portion of the flue gas treated by the dehydration unit;
- and
- the flue gas treatment system is devoid of a carbon dioxide condensation unit upstream, in the direction of flow of the carbon dioxide rich flue gas, of the second compression and cooling device.
A method of treating a carbon dioxide rich flue gas, the method comprising:
- forwarding the carbon dioxide rich flue gas to a gas cleaning system to remove contaminants from the carbon dioxide rich flue gas and produce a cleaned carbon dioxide rich flue gas;
- forwarding at least a first portion of the cleaned carbon dioxide rich flue gas to a boiler used to produce the carbon dioxide rich flue gas;
- forwarding at least a second portion of the cleaned carbon dioxide rich flue gas to a gas-gas heater and then forwarding the heated and cleaned carbon dioxide rich flue gas to a nitrogen oxides reduction unit to reduce nitrogen oxides present in the heated and cleaned carbon dioxide rich flue gas to nitrogen and water and produce a cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas stream;
- and
- providing the cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas stream to a condenser having a first stage and a second stage, the first stage operative to condense at least a portion of water vapour present in the cleaned and nitrogen oxide(s) depleted carbon dioxide rich flue gas stream to produce a cleaned, nitrogen oxide(s), and water vapour depleted carbon dioxide rich flue gas stream, and the second stage operative to further pressurize and cool at least a portion of the cleaned nitrogen oxide(s) depleted carbon dioxide rich flue gas.
Dependencies are inferred from the claim text.