Oxy-fuel cracking furnaces and boilers using co2 as the working fluid
AssigneeLamar University, A Component of the Texas State University System ,An Agency
InventorsDaniel H. Chen, Russel Buss, Dan P. Femandes
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Abstract
Disclosed is an ethylene and/or propylene cracker unit that uses recycled carbon dioxide as a working fluid. A boiler may also use recycled carbon dioxide as a working fluid. In either instance, instead of releasing high-purity CO2 into the atmosphere, the bulk of the CO2 is utilized as the working fluid and the produced CO2 is captured and sent to the pipeline for utilization or storage. These systems will minimize heat loss and achieve essentially zero CO2 emission to the air.
Claims20
A method for cracking hydrocarbons, comprising:
- producing a heated outlet gas in a combustion chamber from combustion of a hydrocarbon fuel source mixed with an oxidant source and carbon dioxide gas, wherein the hydrocarbon fuel source is burned in the combustion chamber to produce the heated outlet gas comprising carbon dioxide and water;
- generating a mixture of the heated outlet gas with a hydrocarbon feed and steam in a cracking system;
- heating the mixture in the cracking system to produce an ethylene and/or propylene containing stream and a separate water/carbon dioxide stream;
- separating the water from the carbon dioxide in the water/carbon dioxide stream;
- and
- recycling at least a portion of the separated carbon dioxide back to the combustion chamber.
A system for cracking hydrocarbons, comprising:
- a combustion chamber configured to produce a heated outlet gas from combustion of a hydrocarbon fuel source mixed with an oxidant source and carbon dioxide gas, wherein the heated outlet gas includes carbon dioxide and water;
- a cracking system configured to heat a mixture of the heated outlet gas with a hydrocarbon feed and steam to produce an ethylene and/or propylene containing stream and a separate water/carbon dioxide stream;
- a separator system configured to separate the water from the carbon dioxide in the water/carbon dioxide stream;
- and
- a recycling stream exiting the separator system, the recycling stream configured to recycle at least a portion of the separated carbon dioxide back to the combustion chamber.
A method for heat treating hydrocarbons, comprising:
- providing a hydrocarbon fuel source mixed with an oxidant source and carbon dioxide gas to a boiler, wherein the hydrocarbon fuel source is burned in the boiler to produce a heated outlet gas comprising carbon dioxide and water;
- separating the water from the carbon dioxide in the heated outlet gas;
- and
- recycling at least a portion of the separated carbon dioxide back to the boiler.
A system for cracking hydrocarbons, comprising:
- a boiler configured to produce a heated outlet gas from combustion of a hydrocarbon fuel source mixed with an oxidant source and carbon dioxide gas, wherein the heated outlet gas includes carbon dioxide and water;
- a separator system configured to separate the water from the carbon dioxide in the heated outlet gas;
- and
- a recycling stream exiting the separator system, the recycling stream configured to recycle at least a portion of the separated carbon dioxide back to the boiler.
Dependencies are inferred from the claim text.