Gasification combined cycle power generation process with heat-integrated chemical production

• US 5,666,800 A
• Filed: 06/14/1994
• Issued: 09/16/1997
• Est. Priority Date: 06/14/1994
• Status: Expired due to Fees

• Current Assignee: Air Products and Chemicals Incorporated (Linde Plc)
• Original Assignee: Air Products and Chemicals Incorporated (Linde Plc)
• Inventors: Scharpf, Eric William, Sorensen, James Christian
• Primary Examiner(s): FREAY, CHARLES GRANT
• Application Number:
  US08/259,649
• Time in Patent Office: 1,190 Days
• Field of Search: 60/39.02, 60/39.05, 60/39.463, 60/39.53, 60/39.59, 60/39.12
• US Class Current: 60/781
• CPC Class Codes: C10J 2300/165 integrated with a gas turbine or gas motor gas turbine plants provided with a gas producer F02C3/28; engines using solid fuels F02B43/08
• CPC Class Codes: C10J 2300/1653 integrated in a gasification combined cycle [IGCC] engines driven by heat coming from a gasification or pyrolysis unit F01K23/067
• CPC Class Codes: C10J 2300/1675 making use of a steam turbine
• CPC Class Codes: C10J 2300/1869 with one stream being air, oxygen or ozone
• CPC Class Codes: C10J 2300/1884 with one stream being synthesis gas
• CPC Class Codes: C10J 2300/1892 with one stream being water/steam
• CPC Class Codes: C10K 1/004 Sulfur containing contaminants, e.g. hydrogen sulfide
• CPC Class Codes: C10K 1/10 with aqueous liquids alkaline reacting aqueous liquids C10K1/12
• CPC Class Codes: F01K 21/047 having at least one combustion gas turbine
• CPC Class Codes: F01K 23/068 in combination with an oxygen producing plant, e.g. an air separation plant
• CPC Class Codes: F02C 3/22 the fuel or oxidant being gaseous at standard temperature and pressure F02C3/28 takes precedence
• CPC Class Codes: F02C 3/28 using a separate gas producer for gasifying the fuel before combustion
• CPC Class Codes: F02G 2250/03 Brayton cycles
• CPC Class Codes: F05D 2260/212 by water injection
• CPC Class Codes: F25J 2205/32 as direct contact cooling tower to produce a cooled gas stream, e.g. direct contact after cooler [DCAC]
• CPC Class Codes: F25J 2205/34 as evaporative cooling tower to produce chilled water, e.g. evaporative water chiller [EWC]
• CPC Class Codes: F25J 2230/02 Compressor intake arrangement, e.g. filtering or cooling
• CPC Class Codes: F25J 2240/70 Steam turbine, e.g. used in a Rankine cycle
• CPC Class Codes: F25J 2270/14 External refrigeration with work-producing gas expansion loop
• CPC Class Codes: F25J 3/04018 of main feed air
• CPC Class Codes: F25J 3/04127 : Gas turbine as the prime mechanical driver
• CPC Class Codes: F25J 3/04545 : for the gasification of solid or heavy liquid fuels, e.g. integrated gasification combined cycle [IGCC]
• CPC Class Codes: F25J 3/04575 : for a gas expansion plant, e.g. dilution of the combustion gas in a gas turbine
• CPC Class Codes: F25J 3/04593 : The air gas consuming unit is also fed by an air stream
• CPC Class Codes: F25J 3/04606 : Partially integrated air feed compression, i.e. independent MAC for the air fractionation unit plus additional air feed from the air gas consuming unit
• CPC Class Codes: F25J 3/04612 : Heat exchange integration with process streams, e.g. from the air gas consuming unit
• CPC Class Codes: Y02E 20/16 : Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
• CPC Class Codes: Y02E 20/18 : Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
• CPC Class Codes: Y02P 20/10 : Process efficiency
• CPC Class Codes: Y02P 20/129 : Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
• CPC Class Codes: Y02P 80/15 : On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Abstract

A method for improving the efficiency of a gasification combined cycle system for the coproduction of electric power and one or more chemical or liquid fuel products from a synthesis gas feed containing hydrogen and carbon monoxide. Waste heat is recovered from the chemical reaction system in the form of heated water which is used to heat and humidify one or more gas streams introduced into the combustor of the combined cycle system gas turbine. Waste refrigeration recovered from the synthesis gas purification system optionally is used to cool the air inlet to the gas turbine compressor.

Claims

1. In the coproduction of electric power and one or more chemical or liquid fuel products from a synthesis gas feed containing hydrogen and carbon monoxide, wherein said electric power is produced in a generator driven by a combustion turbine system in which inlet air is compressed and combusted with fuel in a combustor to provide hot pressurized combustion gas which is expanded through an expansion turbine to drive said generator, the efficiency of producing said power and chemical or liquid fuel products is improved by a method which comprises reacting a first portion of said synthesis gas feed exothermically to produce said chemical or liquid fuel products, unreacted synthesis gas, and heat of reaction, recovering at least a portion of said heat of reaction by indirect heat exchange with water to yield a stream of heated water, heating and humidifying a stream of supplemental fuel gas by direct contact with a portion of said stream of heated water to yield hot humidified supplemental fuel gas, introducing said hot humidified supplemental fuel into said combustor, combining said unreacted synthesis gas with a second portion of said synthesis gas feed, and introducing the resulting combined synthesis gas stream as additional fuel into said combustor.

2. The method of claim 1 wherein said supplemental fuel gas is natural gas.