Integrated calcium looping combined cycle for sour gas applications
AssigneeSaudi Arabian Oil Company
InventorsMourad Younes, Ali Hoteit, Aqil Jamal
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Abstract
A chemical looping combustion (CLC) process for sour gas combustion is integrated with a gas turbine combined cycle and a steam generation unit, and is configured to provide in-situ removal of H2S from the sour gas fuel by reacting the H2S with a oxygen carrier at a location within the fuel reactor of the CLC unit. The process is also configured such that oxygen-rich exhaust gases from the gas turbine combined cycle is used to feed the air reactor of the CLC unit and re-oxidize oxygen carriers for recirculation in the CLC unit.
Claims36
A process for utility and power generation using sour gas fuel integrating a chemical looping combustion process, a gas turbine, and a steam generation unit, comprising the steps of:
- injecting an oxygen carrier and a sour gas fuel into a fuel reactor;
- reforming the sour gas fuel in the fuel reactor to produce syngas and a reduced oxygen carrier;
- separating the reduced oxygen carrier from the syngas;
- cooling the syngas by passing the syngas through the steam generation unit;
- combusting the cooled syngas in a combustion chamber of the gas turbine whereby exhaust gases are produced;
- cooling at least a first portion of the exhaust gases by passing the first portion of the exhaust gases through the steam generation unit;
- and
- injecting the cooled first portion of the exhaust gases into an air reactor to oxidize the reduced oxygen carrier which was separated from the syngas resulting in formation of oxygen-depleted exhaust gases.
A utility and power generation system that utilizes a chemical looping combustion process comprising:
- a source of sour gas fuel;
- a fuel reactor in which the sour gas fuel and an oxygen carrier are introduced, the sour gas is reformed to form a product stream, and the oxygen carrier is reduced;
- a steam generation unit that is in fluid communication with the fuel reactor and receives the product stream through a first conduit, the steam generation unit being configured to act as a heat transfer unit that cools the product stream;
- a gas turbine that is in fluid communication with the steam generation unit and receives the cooled product stream through a second conduit, the gas turbine including a combustion chamber for combusting the cooled product stream to generate exhaust gases;
- a third conduit that fluidly connects the gas turbine to the steam generation unit such that at least a first portion of the exhaust gases is transported from the gas turbine to the steam generation unit which acts to cool the exhaust gases;
- an air reactor that is fluidly connected to the gas turbine by the third conduit and a fourth conduit such that the cooled exhaust gases are delivered to the air reactor, the fourth conduit being fluidly connected between the steam generation unit and the air reactor, the air reactor being in fluid communication with the fuel reactor such that the reduced oxygen carrier is received from the fuel reactor and is oxidized by the cooled exhaust gases from the combustion chamber of the gas turbine resulting in formation of oxygen-depleted exhaust gases;
- and
- wherein the air reactor is fluidly connected to the steam generation unit which acts to cool the oxygen-depleted exhaust gases exiting the air reactor.
Dependencies are inferred from the claim text.