JP2971172B2 - Steam / carbon dioxide two-fluid gas turbine plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing carbon dioxide (hereinafter referred to as CO2)._Two
Steam / CO that facilitates separation) _TwoTwo-fluid gas
It relates to a turbine plant.

[0002]

Conventionally, to drive the gas turbine by steam · CO ₂ gas mixture, steam · CO exiting the gas turbine
_There is no technology relating to a steam / CO ₂ two-fluid gas turbine plant that can easily separate CO _{2 of a two-} fuel mixture from steam.

[0003]

The technical problems of the steam / CO ₂ two-fluid gas turbine plant include the following. 1. It is extremely difficult to separate and remove CO ₂ from a two-fluid mixed gas of steam and CO ₂ generated when burning petroleum hydrocarbon fuel. 2. Relatively pure oxygen is required to burn the fuel.

An object of the present invention is to provide a novel steam / CO ₂ two-fluid gas turbine plant that can solve the above problems.

[0005]

Means for Solving the Problems The steam / CO _{2 of the} present invention is used.
A two-fluid gas turbine plant is a combustor that burns hydrocarbon fuel with oxygen to generate a combustion gas of a steam / CO ₂ mixture, a gas turbine driven by the combustion gas,
A waste heat boiler to which a mixture of steam and CO ₂ from the gas turbine is supplied, and a steam removal from the mixture of steam and CO ₂ from the waste heat boiler to separate and remove CO ₂ and a gas removal fan. A condenser, a flash evaporator for evaporating condensate from the condenser, and a vapor compressor for compressing steam from the evaporator and supplying the compressed vapor to the combustor.

[0006]

[Function] Combustion gas of a mixture of steam and CO ₂ two-fluid gas generated by a combustor that burns hydrocarbon fuel using oxygen gas is expanded by a gas turbine, and steam is generated by a waste heat boiler. Flows into the condenser. In the condenser, the water vapor in the air-fuel mixture is condensed and CO ₂ is discharged to the outside by a gas removal fan.

[0007] The condensed water is evaporated by a flash evaporator, and the generated steam is compressed by a steam compressor and supplied to a combustor to form a closed cycle.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. 3 is a case where petroleum hydrocarbon fuel is supplied from the fuel supply device 1;
The combustor is supplied with oxygen from the oxygen supply device 2, and the combustion gas of the combustor 3 is supplied to a gas turbine 4 that drives an air compressor 5 and a generator 6.

Reference numeral 7 denotes a waste heat boiler to which exhaust gas from the gas turbine 4 is supplied. The exhaust gas from the waste heat boiler 7 is supplied to a condenser 13 having a gas removing fan 12. The gas removal fan 12 is configured to discharge gas in the condenser 13 to the outside of the condenser 13, and a drain filter 14 is provided between the gas removal fan 12 and the condenser 13. . The lower part of the condenser 13 is connected to a flash evaporator 16 via a condenser pump 15 and a pipe 20, and the upper part of the flash evaporator 16 is connected to the inlet side of the steam compressor 5 driven by the gas turbine 4. The outlet side of the steam compressor 5 is connected to the combustor 3.

Water is supplied to the waste heat boiler 7 from a water supply pump 8 and evaporates.
The exhaust side of the steam turbine 9 is connected to the feed pump via a condenser 11. Reference numeral 17 denotes a control valve which is controlled by control air and extracts or extracts water from a pipe 20 between the condensate pump 15 and the flash evaporator 16.

In this embodiment constructed as described above, the fuel supply device 1 switches the petroleum hydrocarbon fuel and the oxygen supply device 2
The combustion is performed in the combustor 3 to which oxygen is supplied, respectively, and a combustion gas of a mixture of high-temperature steam and CO ₂ two-fluid gas is generated. This combustion gas expands in the gas turbine 4, drives the steam compressor 5 and the generator 6, and then flows into the waste heat boiler 7.

In the waste heat boiler 7, feed water from a feed water pump 8 is evaporated and superheated steam is sent to a steam turbine 9. The steam turbine 9 drives the generator 10, and the exhaust gas is supplied to the condenser 1.
The water is condensed at 1 and circulated to the water supply pump 8.

Steam / CO as exhaust gas of waste heat boiler 7
Mixture of ₂ two-fluid gas flows into condenser 13 having a gas removal fan 12, CO ₂ with steam to condensate through the drain Roki 14, gas removal fan 12 is discharged to the outside.

The condensate generated in the condenser 13 is pressurized by a condensate pump 15, sprayed to a flash evaporator 16 and flashed under reduced pressure to be steam. This flash steam is sucked into the steam compressor 5 and supplied to the pressurized upper combustor 3 again to form a closed cycle system.

As described above, in the present embodiment, the two-fluid gas phase of steam / CO ₂ from the combustor 3 to the condenser 13, the aqueous phase from the condenser 13 outlet to the flash evaporator 16, and the flash evaporator 16 outlet From the air to the inlet of the combustor 3 becomes a steam phase.

The adjustment of the gas turbine side is performed by extracting or extracting water from the system by the control valve 17.

As described above, in this embodiment, after the combustion gas, which is a mixture of the two-fluid gas of steam and CO ₂ generated in the combustor 3, works in the gas turbine 4, the CO ₂ in the combustion gas Can be easily separated in the condenser 13 having the gas removal fan 12.

Further, even if nitrogen or the like remains in the oxygen supplied to the combustor 3, it is removed together with CO ₂ in the condenser 13 having the gas removing fan 12, so that expensive high-purity oxygen is used. There is no need to use.

Furthermore, any kind of petroleum-based hydrocarbon fuel can be used.

[0020]

As described above, according to the present invention,
Steam / CO_TwoConventional problems in two-fluid gas turbine plants
Steam and CO_TwoFrom a mixture of two fluid gases
CO _TwoCan be easily removed and separated. Ma
Also, there is residual nitrogen etc. in the oxygen supplied to the combustor.
This is also a condenser with a gas removal fan_TwoWith
Need to use expensive high-purity oxygen
There is no.

[0021] Furthermore, all kinds of hydrocarbon fuels can be used, and when a gas turbine is combined with a steam turbine, a high-efficiency combined plant can be obtained.

[Brief description of the drawings]

FIG. 1 is a system diagram of one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel supply apparatus 2 Oxygen supply apparatus 3 Combustor 4 Gas turbine 5 Steam compressor 6 Generator 7 Waste heat boiler 9 Steam turbine 12 Gas removal fan 13 Condenser 15 Condenser pump 16 Flash evaporator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F01K 25/00 F01K 21/04 F02C 3/30 F02C 3/34 F28D 20/00

Claims (1)

(57) [Claims] 1. A combustor for burning a hydrocarbon fuel using oxygen gas to generate a combustion gas of a mixture of steam and carbon dioxide, a gas turbine driven by the combustion gas, and steam and carbon dioxide from the gas turbine. A waste heat boiler to which a gas mixture is supplied, a condenser having a gas removal fan and a condenser for separating and removing carbon dioxide by condensing steam from the steam / carbon dioxide mixture from the waste heat boiler, A flash evaporator for evaporating condensate, and a steam compressor for compressing steam from the flash evaporator and supplying the compressed steam to the combustor.
Carbon dioxide two-fluid gas turbine plant.