Hydrogen supply system and hydrogen supply method

Patent metadata

Field	Value
Publication number	US-2016176784-A1
Application number	US-201414910161-A
Country	US
Kind code	A1
Filing date	Aug 5, 2014
Priority date	Aug 6, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

To reduce the emission of carbon dioxide and improve the energy efficiency in a hydrogen supply system. The hydrogen supply system ( 1 ) comprises: a reformer ( 5 ) for performing steam reforming of a hydrocarbon; a shift reaction unit ( 6 ) for producing a gas containing hydrogen and carbon dioxide by causing a water gas shift reaction of a gas obtained from the reformer; a first absorber ( 36 ) for absorbing the carbon dioxide contained in the gas obtained from the shift reaction unit in an absorption liquid; a hydrogenation reaction unit ( 8 ) for producing a hydrogenated aromatic compound by causing a hydrogenation reaction of an aromatic compound with a gas that has passed through the first absorber; and a regenerator ( 37 ) for separating the carbon dioxide from the absorption liquid by re-circulating the absorption liquid from the first absorber and heating the absorption liquid with heat generated from the hydrogenation reaction.

First claim

1 . A hydrogen supply system, comprising:
a reformer for performing steam reforming of a hydrocarbon; a shift reaction unit for producing a gas containing hydrogen and carbon dioxide by causing a water gas shift reaction of a gas obtained from the reformer; a first absorber for absorbing the carbon dioxide contained in the gas obtained from the shift reaction unit in an absorption liquid; a hydrogenation reaction unit for producing a hydrogenated aromatic compound by causing a hydrogenation reaction of an aromatic compound with a gas that has passed through the first absorber; and a regenerator for separating the carbon dioxide from the absorption liquid by re-circulating the absorption liquid from the first absorber and heating the absorption liquid with heat generated from the hydrogenation reaction.

2 . The hydrogen supply system according to claim 1 , further comprising
a heating furnace for supplying heat to the reformer; and a second absorber for absorbing the carbon dioxide generated from the heating furnace in an absorption liquid; wherein the second absorber re-circulates the absorption liquid to the regenerator, and the absorption liquid that has absorbed the carbon dioxide in the second absorber is heated in the regenerator to separate the carbon dioxide therefrom.

3 . The hydrogen supply system according to claim 2 , further comprising a hydrogen separation unit for separating the hydrogen from the gas that has passed through the first absorber, and supplying the separated hydrogen to the hydrogenation reaction unit, combustion heat of the gas remaining after the hydrogen is separated in the hydrogen separation unit being supplied to the heating furnace.

4 . The hydrogen supply system according to claim 1 , wherein the heat generated by the hydrogenation reaction is supplied to the regenerator as steam at a temperature of 100 to 200° C. and a pressure of 0.10 to 1.62 MPaA.

5 . The hydrogen supply system according to claim 1 , further comprising a pressure injection unit for pressure injecting the carbon dioxide that is separated from the absorption liquid by the regenerator into a pressure injection well in order to increase a fluidity of the fossil fuel buried underground when extracting fossil fuel buried underground, the reformer reforming at least a part of product gas produced as the fossil fuel or associated gas thereof that is extracted from a production well for extracting the fossil fuel.

6 . The hydrogen supply system according to claim 5 , further comprising a first separation unit for separating the hydrogen and the carbon dioxide in the gas obtained from the shift reaction unit from each other by using inorganic membrane.

7 . The hydrogen supply system according to claim 5 , wherein the production well is provided in an oil field for extracting petroleum, and the petroleum is extracted as the fossil fuel.

8 . The hydrogen supply system according to claim 5 , wherein the production well is provided in a shale formation for extracting natural gas, and the natural gas is extracted as the fossil fuel.

9 . The hydrogen supply system according to claim 5 , further comprising a desulfurization unit for removing a sulfur content from the product gas before the product gas is reformed by the reformer.

10 . The hydrogen supply system according to claim 8 , wherein the product gas includes the natural gas extracted from the shale formation and the pressure injected carbon dioxide, and the system further comprises a second separation unit for separating the natural gas and the carbon dioxide of the product gas from each other,
the reformer reforming at least part of the natural gas separated by the second separation unit, and the pressure injection unit pressure injecting the carbon dioxide separated by the second separation unit into the pressure injection well in order to increase a fluidity of the fossil fuel buried underground.

11 . A hydrogen supply method, comprising:
a hydrogen generation step for generating a gas containing hydrogen and carbon dioxide by a steam reforming of a hydrocarbon and a water gas shift reaction of a gas obtained by the steam reforming; an absorption step for absorbing the carbon dioxide contained in the gas obtained by the hydrogen generation step in an absorption liquid; a hydrogenation step for producing a hydrogenated aromatic compound by causing a hydrogenation reaction of an aromatic compound with the gas that has been processed by the absorption step; and a regeneration step for separating the carbon dioxide from the absorption liquid by heating the absorption liquid that has absorbed the carbon dioxide by using heat that has been generated by the hydrogenation reaction.

12 . The hydrogen supply method according to claim 11 , further comprising a pressure injection step for pressure injecting the carbon dioxide that is separated in the regeneration step into a pressure injection well in order to increase a fluidity of the fossil fuel when extracting the fossil fuel from the underground,
wherein at least a part of product gas produced as the fossil fuel or associated gas thereof that is extracted from a production well for extracting the fossil fuel is reformed in the hydrogen generation step.

Assignees

• Chiyoda Corp

Inventors

• Okada Yoshimi
• Shirasaki Tomohiko
• Ikeda Osamu
• Imagawa Kenichi
• Kawai Hironori
• Shiraga Masato
• Ishiyama Tatsuo

Classifications

• Y02P20/156

  Methane [CH4] · CPC title

• B01D2257/502

  Carbon monoxide · CPC title

• B01D2252/20478

  Alkanolamines · CPC title

• C01B2203/0475

  the impurity being carbon dioxide · CPC title

• B01D53/75

  Multi-step processes · CPC title