Gas engine with a gas fuel reforming device
First Claim
1. A gas engine with a gas fuel reforming device, comprising:
- a fuel tank containing a natural gas fuel having CH4 as a major component;
an exhaust passage to discharge exhaust gas from combustion chambers;
a catalyst reactor installed in the exhaust passage to thermally decompose a gas mixture of CH4 and CO2 into a reformed fuel of CO and H2 by using thermal energy of the exhaust gas;
a gas fuel supply device to supply the natural gas fuel from the fuel tank to the catalyst reactor;
a CO2 supply device to supply to the catalyst reactor CO2 separated from the exhaust gas by a CO2 separator; and
a reformed fuel supply device to supply the reformed fuel to the combustion chambers;
wherein the combustion chambers are formed in a heat insulating structure of a ceramic member.
2 Assignments
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Accused Products
Abstract
The gas engine with a gas fuel reforming device thermally decomposes CH4, a major component of natural gas, into a reformed fuel of CO and H2 to increase the heat produced and thereby reduce the CO2 content in the exhaust gas and prevent the formation of NOx. The gas engine mixes CH4 with CO2 and sends the gas mixture to the catalyst reactor installed in the exhaust passage where the gas mixture is thermally decomposed into a reformed fuel by using the thermal energy of the exhaust gas. CO2 is extracted from the exhaust gas by the CO2 supply device which in turn sends the CO2 to the catalyst reactor. The CO2 supply device comprises a CO2 dissolving device that accommodates a solution to dissolve CO2 of low-temperature exhaust gas and a CO2 delivery device installed in the exhaust passage through which high-temperature exhaust gas flows and adapted to release CO2 from the solution supplied from the CO2 dissolving device. The CO2 supply device can be formed of a CO2 separation membrane that separates CO2 from the exhaust gas.
60 Citations
22 Claims
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1. A gas engine with a gas fuel reforming device, comprising:
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a fuel tank containing a natural gas fuel having CH4 as a major component; an exhaust passage to discharge exhaust gas from combustion chambers; a catalyst reactor installed in the exhaust passage to thermally decompose a gas mixture of CH4 and CO2 into a reformed fuel of CO and H2 by using thermal energy of the exhaust gas; a gas fuel supply device to supply the natural gas fuel from the fuel tank to the catalyst reactor; a CO2 supply device to supply to the catalyst reactor CO2 separated from the exhaust gas by a CO2 separator; and a reformed fuel supply device to supply the reformed fuel to the combustion chambers; wherein the combustion chambers are formed in a heat insulating structure of a ceramic member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A gas engine with a natural gas reforming device, comprising:
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a fuel tank containing a natural gas fuel having CH4 as a major component; a catalyst reactor installed in an exhaust passage to thermally decompose CH4 supplied from the fuel tank into a reformed fuel by using exhaust gas discharged from combustion chambers; a reformed fuel supply device to supply the reformed fuel to the combustion chambers; a turbocharger installed in the exhaust passage downstream of the catalyst reactor; a first-stage heat exchanger installed in the exhaust passage downstream of the turbocharger; a steam turbine driven by steam generated by the first-stage heat exchanger; a condenser to convert steam discharged from the steam turbine into water; a second-stage heat exchanger installed in the exhaust passage downstream of the first-stage heat exchanger to convert water delivered from the condenser into steam and supply the steam to the first-stage heat exchanger; and a CO2 supply device to separate CO2 from the exhaust gas by a CO2 separation membrane installed in the exhaust passage downstream of the second-stage heat exchanger and to supply the separated CO2 to the catalyst reactor. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A gas engine with a gas fuel reforming device, comprising:
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a fuel tank containing a natural gas fuel having CH4 as a major component; an exhaust passage to discharge exhaust gas from combustion chambers; a catalyst reactor installed in the exhaust passage to thermally decompose a gas mixture of CH4 and CO2 into a reformed fuel of CO and H2 by using thermal energy of the exhaust gas; a gas fuel supply device to supply the natural gas fuel from the fuel tank to the catalyst reactor; a CO2 supply device to supply CO2 separated from the exhaust gas to the catalyst reactor; and a reformed fuel supply device to supply the reformed fuel to the combustion chambers; wherein the CO2 supply device comprises; a CO2 dissolving device containing a solution to dissolve CO2 of a cooled, low-temperature exhaust gas; a CO2 delivery device installed in the exhaust passage through which high-temperature exhaust gas discharged from the combustion chambers flows, the CO2 delivery device being able to release CO2 from the solution, in which CO2 was dissolved by the CO2 dissolving device, by heating the solution with the high-temperature exhaust gas, the CO2 delivery device being able to accommodate the solution and send the released CO2 to the catalyst reactor; and a circulation pump to circulate the solution between the CO2 dissolving device and the CO2 delivery device.
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Specification