Method and system for producing liquid fuel and generating power

Patent metadata

Field	Value
Publication number	US-9611438-B2
Application number	US-201314428461-A
Country	US
Kind code	B2
Filing date	Sep 4, 2013
Priority date	Sep 21, 2012
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A steam reformer generates reformed gas by a steam-reforming reaction of hydrocarbon gas such as natural gas. A methanol synthesis column and a gasoline synthesis column synthesize gasoline from the reformed gas via methanol and produce a liquid fuel. A superheater superheats a part of low-pressure steam that has been heat-recovered from the reformed gas with a part of middle-pressure steam that has been heat-recovered by the methanol synthesis column or the gasoline synthesis column, and the steam thereby brought into an unsaturated state is supplied to a low-pressure steam turbine.

First claim

The invention claimed is:

1. A system for producing a liquid fuel from hydrocarbon gas and for generating power, the system comprising:
a steam-reforming device configured to generate reformed gas by performing a steam-reforming reaction with hydrocarbon gas;
a synthesis column configured to synthesize gasoline, dimethyl ether, or a diesel fuel from the reformed gas via methanol;
a heat exchanging device configured to obtain saturated steam with a temperature of 180° C. or lower by performing heat exchange with the reformed gas before the reformed gas is used by the synthesis column;
a superheating device configured to superheat the saturated steam by using a heat source with a temperature of 200° C. or higher generated within the system and obtain superheated steam; and
a power generation device configured to generate power by using the superheated steam,
wherein the superheating device uses steam generated by an exothermic reaction run in the synthesis column as a heat source.

2. The system according to claim 1 , wherein a part of the reformed gas obtained by the steam-reforming device is used as the heat source for the superheating device.

3. The system according to claim 1 , wherein flue gas generated by from a burning portion of the steam-reforming device is used as the heat source for the superheating device.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Iijima Masaki
• Yoshiyama Ryuji
• Hirayama Haruaki
• Seiki Yoshio

Classifications

• C01B2203/0811

  by combustion of fuel · CPC title

• C01B3/384 Primary

  with external heating of the catalyst · CPC title

• C07C41/09

  by dehydration of compounds containing hydroxy groups · CPC title

• C07C29/152

  characterised by the reactor used · CPC title

• C10L2290/42

  Fischer-Tropsch steps · CPC title