Natural gas reforming apparatus, oxygen eliminating apparatus provided in the same apparatus, and natural gas reforming apparatus-carrying gas engine
First Claim
1. A natural gas reforming apparatus comprising an exhaust gas pipe in which an exhaust gas discharged from an engine flows, an exhaust gas passage body provided in said exhaust gas pipe and comprising a porous material provided with a honeycomb or passage holes forming an exhaust gas passage, a gas fuel case provided on the outer side of said exhaust gas pipe and having an inlet from which a gas fuel supplied from a gas fuel supply source and containing CH4 as a main component is supplied, and an inlet from which CO2 separated from the exhaust gas is supplied, a porous member provided in said gas fuel case, forming a gas fuel passage and comprising a porous ceramic material, a catalyst applied to a surface of said gas fuel passage-forming porous member, and having an action of converting CH4 and CO2 into a reformed fuel of CO and H2 by thermally decomposing CH4 and CO2 by the thermal energy of the exhaust gas, and a heat insulating material provided on an outer circumferential surface of said gas fuel case.
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Accused Products
Abstract
This invention provides a gas engine in which a natural gas reforming apparatus for thermally decomposing CH4 in a natural gas into a reformed fuel of CO and H2 is used to improve the thermal efficiency, CO2 in an exhaust gas being used for the thermal decomposition operation to reduce the CO2 content of the discharged exhaust gas and minimize the generation of NOx. An oxygen eliminating apparatus for removing O2 from CO2 separated from the exhaust gas can be provided in the natural gas reforming apparatus. In this natural gas reforming apparatus, a gas fuel case in which a gas fuel flows is provided on the outer side of an exhaust gas passage body in which the exhaust gas flows, and a surface of a porous member provided in the gas fuel case is coated with a catalyst. The oxygen eliminating apparatus comprises a porous carbon member provided in a CO2 passage so as to subject O2 in CO2 and C to a reaction and convert the same substances into CO and CO2, and a power source for electrically heating the porous carbon member.
34 Citations
13 Claims
- 1. A natural gas reforming apparatus comprising an exhaust gas pipe in which an exhaust gas discharged from an engine flows, an exhaust gas passage body provided in said exhaust gas pipe and comprising a porous material provided with a honeycomb or passage holes forming an exhaust gas passage, a gas fuel case provided on the outer side of said exhaust gas pipe and having an inlet from which a gas fuel supplied from a gas fuel supply source and containing CH4 as a main component is supplied, and an inlet from which CO2 separated from the exhaust gas is supplied, a porous member provided in said gas fuel case, forming a gas fuel passage and comprising a porous ceramic material, a catalyst applied to a surface of said gas fuel passage-forming porous member, and having an action of converting CH4 and CO2 into a reformed fuel of CO and H2 by thermally decomposing CH4 and CO2 by the thermal energy of the exhaust gas, and a heat insulating material provided on an outer circumferential surface of said gas fuel case.
- 8. An oxygen eliminating apparatus for a gas engine provided with an exhaust passage through which an exhaust gas from combustion chambers is discharged, a CO2 supply apparatus provided in said exhaust passage and having a CO2 separation film for separating CO2 from said exhaust gas, and a natural gas reforming apparatus provided in said exhaust passage so as to convert a natural gas into a reformed gas of CO and H2 by thermally decomposing CH4 in said natural gas by the thermal energy of said exhaust gas, and adapted to receive CO2 from the CO2 supply apparatus, said oxygen eliminating apparatus comprising a casing provided in a CO2 passage in which a CO2 -containing separated gas which has passed through the CO2 supply apparatus flows, and having an inlet which said separated gas said separated gas enters and an outlet from which said separated gas is discharged, a porous carbon member supported in said casing via nonconductive supports and adapted to allow said separated gas to pass therethrough, and a power source for electrically heating said porous carbon member for the purpose of subjecting O2 contained in said separated gas to a reaction with the carbon of said porous carbon member and converting said substances into CO and CO2.
- 10. A gas engine comprising a gas fuel supply source holding a natural gas fuel containing CH4 as a main component, a natural gas reforming apparatus adapted to convert CH4, which is supplied from said gas fuel supply source, into a reformed fuel by thermally decomposing CH4 by the thermal energy of an exhaust gas from combustion chambers, and provided in an exhaust passage, a turbocharger provided in the portion of said exhaust passage which is on the downstream side of said natural gas reforming apparatus, an apparatus for supplying said reformed fuel to said combustion chambers, a Rankine cycle provided with heat exchangers and installed in the portion of said exhaust passage which is on the downstream side of said turbocharger, and a CO2 supply apparatus provided in the portion of said exhaust passage which is on the downstream side of said Rankine cycle, and adapted to supply CO2, which is separated from said exhaust gas by CO2 separation films to a gas fuel case of said natural gas reforming apparatus through a CO2 passage.
Specification