Manufacturing method and manufacturing apparatus of syngas, and manufacturing method of liquid hydrocarbon using the same
Provided are a method for manufacturing syngas including the steps of (S1) heat-treating organic waste in a first reactor to produce a first mixed gas; (S2) introducing the first mixed gas to a second reactor and subjecting it to methane reforming in the presence of a catalyst to produce a second mixed gas; (S3) separating the catalyst and carbon dioxide from the second mixed gas and recovering a third mixed gas from which the catalyst and the carbon dioxide have been removed; (S4) converting the carbon dioxide separated in step (S3) into carbon monoxide through a reverse Boudouard reaction in a third reactor; and (S5) mixing the third mixed gas recovered in step (S3) and the carbon monoxide converted in step (S4) to produce syngas, and an apparatus for manufacturing syngas.
1. A method for reducing greenhouse gas emission in the manufacture of syngas, the method comprising the steps of:
(S1) heat-treating organic waste in a first reactor to produce a first mixed gas, which comprises methane, hydrogen, carbon monoxide, and carbon dioxide;
(S2) introducing the first mixed gas to a second reactor and subjecting it to methane reforming in the presence of a catalyst to produce a second mixed gas;
(S3) separating the catalyst and carbon dioxide from the second mixed gas and recovering a third mixed gas from which the catalyst and the carbon dioxide have been removed;
(S4) introducing the carbon dioxide separated in step (S3) to a third reactor and converting the carbon dioxide into carbon monoxide through a reverse Boudouard reaction; and
(S5) mixing the third mixed gas recovered in step (S3) and the carbon monoxide converted in step (S4) to produce syngas,
wherein (S4) further comprises the steps of:
(S4-1) introducing the catalyst separated in step (S3) to the third reactor and regenerating the catalyst through a reverse Boudouard reaction; and
(S4-2) recirculating and resupplying the regenerated catalyst to step (S2).
2. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 1 , wherein the methane reforming in step (S2) comprises any one or two or more reactions selected from a methane pyrolysis reaction, a carbon dioxide reforming reaction, or a water vapor reforming reaction.
3. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 1 , wherein the second mixed gas comprises hydrogen, carbon monoxide, and carbon dioxide.
4. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 1 , wherein the catalyst of step (S2) is a composite catalyst in which a metal hydride is supported on a carrier.
5. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 4 , wherein the metal hydride comprises any one or two or more selected from nickel, vanadium, iron, platinum, palladium, or ruthenium.
6. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 4 , wherein the carrier comprises silica, alumina, silica-alumina, carbon, zirconia, titania, zeolite, SAPO, ALPO, and/or mixtures thereof.
7. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 1 , wherein step (S2) is performed at a temperature of 500 to 1000° C. and a pressure of 50 to 300 kPa.
8. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 1 , wherein step (S4) is performed at a temperature of 600 to 1000° C. and a pressure of 50 to 300 kPa.
9. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 1 , further comprising: (S6) performing a water-gas shift reaction.
10. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 1 , wherein the gas produced in step (S5) comprises hydrogen and carbon monoxide and a molar ratio between the hydrogen and the carbon monoxide satisfies 1.8:1 to 2.2:1.
11. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 1 , wherein the organic waste in step (S1) is any one or two or more selected from waste plastic, solid waste, biomass, waste oil or waste tires, and/or standard plastic garbage bags.
12. The method for reducing greenhouse gas emission in the manufacture of syngas of claim 1 , further comprising: before step (S2), purifying the first mixed gas of step (S1).