JPH0491324A - Carbon dioxide recovering type thermal power generation system - Google Patents

Abstract

PURPOSE:To recover CO2 economically with good efficiency by forming a closed loop heat cycle containing a reheat gas turbine and a recovering boiler, and burning liquefied natural gas with pure O2 in a gas turbine, thereby extracting the increased CO2 outside a system for recovering it. CONSTITUTION:In a CO2 recovering type thermal power system, a closed loop heat cycle 3 consists of a reheat gas turbine 1 and an exhaust heat recovery boiler 2, and CO2 is circulated as a working fluid. To LNG serving as fuel, pure O2 equivalently to a theoretical amount of air is supplied from an oxygen supplying means 4 so as to burn by the reheat gas turbine 1. Since CO2 and H2O are generated by burning LNG with pure O2 in the reheat gas turbine 1, H2O is discharged by a condenser 5, and CO2 which is increased by burning, is extracted outside the closed loop system 3 liquefied with a cooling effect at time gasification of LNG or the like so as to recover CO2. Steam serving as the working fluid, which is generated in the exhaust heat recovery boiler 2 is supplied to a steam turbine 6 so as to carry out a work.

Description

Detailed Description of the Invention (Industrial Application Field) This invention is directed to reducing carbon dioxide in the combustion exhaust gas discharged from the boiler or gas turbine of a thermal power plant that uses liquefied natural gas (hereinafter referred to as LNG) as fuel. The present invention relates to a thermal power generation system that recovers CO2 (denoted as CO2).

(Prior Art) In recent years, the phenomenon of global warming caused by ever-increasing CO2 gas has become a worldwide problem, and there is a worldwide demand for its reduction. Approximately 30% of the CO2 generated in Japan comes from thermal power plants, and the electric power industry is under pressure to take effective measures to combat global warming caused by CO2.

However, enormous amounts of CO2 are emitted from thermal power plants, and there have been few reports on methods for efficiently and economically recovering this CO2 from the standpoint of environmental protection. Conventional methods for recovering CO2 by boat include chemical absorption methods, physical adsorption methods, membrane separation methods, and precipitation methods using calcium hydroxide. For example, it is conceivable to recover the entire amount of CO2 by employing a pressure fluctuation CO2 separation device that uses a zeolite adsorbent and separates a specific gas by utilizing the difference in gas adsorption rate depending on the pressure.

(Problem to be solved by the invention) However, these methods are for removing CO2 in relatively small-scale equipment, and only recover several percent of 002 from the huge amount of combustion gas emitted from thermal power plants. However, it is not necessarily practical from a technical or economic point of view to make it fixed.

In addition, when recovering low-concentration CO2 in exhaust gas using a pressure-swinging CO2 separator (PSOCO2), adsorption work must be repeated to increase the concentration, which requires
It seems that it will be quite difficult from an economical point of view, as the amount of water is increasing.

An object of the present invention is to provide a thermal power generation system that efficiently and economically recovers a huge amount of CO2 emitted from a thermal power plant that uses LNG as fuel.

(Means for Solving the Problems) In order to achieve the above object, the carbon dioxide recovery type thermal power generation system of the present invention includes at least a reheat gas turbine and a boiler that recovers exhaust heat from its combustion gas, and
A closed loop heat cycle using 02 as the working fluid is constructed, and the liquefied natural gas is combusted in the theoretical air amount of pure 02 in the Rehito gas turbine, and the CO increased by the combustion is
2 is extracted from the system and recovered.

In addition, the CO2 recovery type thermal power generation system of the present invention has LN
A reformer that reforms G to H2 and CO, a hydrogen separation means that separates H2 from the reformed gas and supplies the remaining gas to the reformer as reforming fuel, and from this hydrogen separation means. It consists of a power generation means that generates electricity using the supplied H2 as fuel, and an oxygen supply means that supplies O2 to the reformer. CO and 02 are introduced into the reformer to obtain reforming heat and recovered as 002.

Further, the CO2 recovery type thermal power generation system of the present invention includes at least a gas turbine and a boiler that recovers exhaust heat from its combustion gas, and a closed pool heat cycle that uses steam as a working medium, and a closed pool heat cycle that uses steam as a working medium, and converts LNG into N2 by reforming LNG. a reformer that converts 02 into CO; a N2 separation means that separates N2 from the reformed gas and supplies it to the gas turbine, while supplying the remaining gas to the reformer as reforming fuel; 02 supply means for supplying the reformer to the reformer, and extracts and excludes N20 generated by burning the reformed gas N2 and pure 02 in the gas turbine out of the closed loop system, while extracting and removing the CO of the reformed gas. and 02 are introduced into the reformer to obtain reforming heat and to be recovered as C02.

Moreover, the CO2 recovery type thermal power generation system of the present invention is comprised of a reformer, a fuel cell, and an 02 supply means,
is reformed in the reformer, and the obtained reformed gas is supplied to the fuel electrode of the fuel cell, and CO and N2 not consumed in the fuel cell and 02 from the 02 supply means are reformed. The reformed outlet gas is introduced into the fuel cell and used as a heat source for reforming.
A recycle gas closed loop system is constructed in which O2 and O2 are circulated as working fluids to the O2 pole of the fuel cell, and CO2 produced by combustion is recovered from this recycle gas.

(Operation) When CO2 is circulated as a working fluid in a closed pool heat cycle composed of a rehito gas turbine and an exhaust heat recovery boiler, only CO2 is produced as a result of combustion in the rehito power turbine.

This C02 is used as a working fluid in the closed pool heat cycle, and only the amount produced by combustion is extracted outside the system and recovered. On the other hand, although CO2 has a high specific heat, it is heated to a high temperature and the pressure ratio is increased in the Rehito gas turbine, so it performs a predetermined function as a working fluid.

In addition, when burning LNG reformed gas N2 and pure 02 in a gas turbine, CO2 is emitted from the gas turbine fuel.
Since the cause of the generation of C is eliminated, C from the huge amount of combustion gas
There is no need to recover O2. The carbon component in the fuel is converted into CO by reforming, is combusted using 02 in a reformer, is used as a reforming heat source, and is then recovered as CO2.

Furthermore, when LNG is reformed in a reformer and supplied to the fuel electrode of a fuel cell to generate electricity, the CO and remaining N2 that are not used for power generation by the fuel cell are used as a heat source for the reformer. 0 in the reformer outlet gas discharged from this reformer.
02 is a high concentration state. Therefore, only CO2 is recovered from the reformer outlet gas, excluding 02.

(Example) Hereinafter, the configuration of the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 shows a principle diagram of an embodiment of the 002 recovery type thermal power generation system of the present invention. In the power generation system of this embodiment, a closed loop heat cycle 3 is configured by a rehito gas turbine 1 and an exhaust heat recovery boiler 2, and CO2 is circulated as a working fluid. In this power generation system, LNG is used as a fuel, and pure O2 corresponding to a stoichiometric air type is supplied from an oxygen supply means 4 to be combusted in a silica gas turbine 1. In the Shishi-I gas turbine 1, CO2 and N20 are generated by combustion of LNG and pure 02. The composition of LNG differs depending on the local production area, but its main component is methane (80 to 100
%) and ethane. The combustion reaction of LNG and pure 02 results in CO2, N20, a few impurities, and a certain exothermic reaction.

Therefore, CO2 and N20 generated by combustion will increase in the closed loop heat cycle 3. N
20 is exhausted by the condenser 5, and the CO2 increased by combustion is extracted out of the closed loop system 3. And LNG
It is liquefied and recovered using vaporization cold heat, etc. Liquefied C0
2 is further sealed in a container and dumped or used industrially.

An example of the oxygen supply means 4 is an oxygen separator. This oxygen separator 4 selectively adsorbs O2 or N2 in the atmosphere using an adsorbent to increase the concentration of O2 and supply it. For example, there is a pressure fluctuation 02 separator (pso o2) that adsorbs and releases a specific gas based on the difference in adsorption rate caused by the pressure fluctuation of a zeolite adsorbent. Pure 02 is obtained by adsorbing 02 or N2 in the air with an adsorbent. Other impurities are ignored as they are extremely small.

Combustion gas discharged from the rehito gas turbine 1 is introduced into an exhaust heat recovery boiler 2, which recovers exhaust heat by heating steam serving as a working fluid and drives a steam turbine 6.

This system prevents nitrogen from being mixed into the combustion gas by burning LNG at 02. As a result, the combustion gas becomes only Co2, N20, and very few impurities, so if 1-I20 is condensed and removed, only CO2 is left, and CO2 can be recovered without a CO2 separator. Note that the remaining CO2 is used as a working fluid.

A more detailed example of this power generation system, ie, the Co2 closed cycle reburning gas turbine combined power generation system, is shown in FIG.

When CO2 is used as the working fluid, since the specific heat ratio of Co2 is small, a high pressure ratio of about 50 is required in order to extract sufficient expansion work from the turbine, and in a conventional simple cycle (pressure ratio of about 15), It is difficult to realize. Therefore, in this system, a fillet gas turbine 1 is adopted,
Pure 02 is supplied to the high-pressure combustor 7 and the reburner 8 separately. This is a combined power generation system in which heat is recovered from the exhaust gas of the Rehito gas turbine 1 using a known exhaust heat recovery steam system. Since CO2 is used as the working fluid in a closed loop, the CO2 emitted from the low-pressure compressor 9 is transferred to an intercooler (water-cooled type).
After being once cooled in step 10, it is introduced into a high-pressure compressor 11 and compressed to a predetermined pressure.

Then, together with this high pressure working fluid (002), L N
02 of the theoretical combustion amount of G is supplied to the high pressure combustor 7 and burned. The high-pressure compressor 11 and the high-pressure turbine 12 are free turbines, and balance the power of the high-pressure compressor and the output of the high-pressure turbine. After performing work in the high pressure turbine 12, the combustion gas is further expanded in the intermediate pressure turbine 13 and then guided to the reburner 8. Note that a part of the high-pressure combustor CO2 is supplied for cooling the blades of the high-pressure turbine 12. Reburner 8
A portion of the LNG is supplied to the reactor, and the combustion gas is reburned to raise the reburner temperature to a predetermined temperature.

However, it is assumed that the supply 02 supplies the theoretical combustion amount similarly to the high-pressure combustor 7. Combustion gas discharged from the low-pressure gas turbine 14 is guided to the exhaust heat recovery boiler 2, cooled to a predetermined temperature, and exhaust heat is recovered.

Then, the steam obtained in the exhaust heat recovery boiler 2 drives the steam turbine 6 to generate electricity. The steam that exits the steam turbine 6 is cooled in the condenser 15 and returned to N20, and then led to the intercooler 10 where it is converted into CO2 of the working fluid that exits the low-pressure compressor 9.
exchanges heat with CO2 and removes heat from it. On the other hand, the working fluid that has exited the heat recovery boiler 2 is passed through a condenser 5 to remove N20 generated by combustion, and then the amount of CO increased by combustion is removed.
2 is extracted out of the system and collected. In addition, the number 16 in the figure
．． 17 is a generator.

According to the inventor's estimate, the heat balance of this system is based on a generating end output of 10,100 O, and the gas turbine output is 530 MW (four 130 MW units), and the steam turbine output is 470 MW.

The amount of LNG supplied is recovered at a rate of 137.6 tons/h.
O2 is 19,30,000 Nm3/, which is 7.4% of the working fluid.
h (378,3 ton/h).

Figure 2 shows another power generation system. This system reforms liquefied natural gas into hydrogen and carbon monoxide, separates hydrogen from this reformed gas and uses it as fuel for power generation, and uses the remaining gas as fuel for reforming. In the reformer, the carbon monoxide of the reformed gas is combusted with pure oxygen supplied from the oxygen supply means to obtain reforming heat and recover it as carbon dioxide. That is, this system is a thermal power generation system that separates CO, which causes CO2 generation, from gas turbine fuel.
N2 is separated from the reformed gas and supplied to the gas turbine 23 for combustion, while the remaining gas is passed through the reformer 2.
1 and combust it to supply reforming reaction heat, and then CO2 is recovered from the combustion gas. The gas turbine 23 and the reformer 21 are supplied with O2 obtained from the atmosphere by an oxygen supply means, for example, the oxygen separator 26 mentioned above. The combustion gas discharged from the gas turbine 23 is further introduced into an exhaust heat recovery boiler 24 to obtain steam for driving a steam turbine 25.

In the gas turbine 23, H20 is generated by combustion of H2 and 02.
occurs. The amount of H20 generated by this combustion is extracted from the closed loop heat cycle system 27 by the amount increased by the combustion, and a part of it is supplied to the reformer 21 as needed to be used in the reforming reaction.

A more detailed example of this power generation system, that is, the LNG reforming CO separation combined power generation system, is shown in FIG.

This system uses reformed gas (
H2 is separated from I]2 and CO gas) and supplied to the combined power generation system as fuel. The remaining gas, including CO and some H2, is returned to the reformer 21 and combusted by 02, and CO2 is recovered from the exhaust gas. in this case,
Carbon content can be completely removed from power generation systems.

If the fuel is H2, it can be used in any power generation system such as a PA type fuel cell, a MC type fuel cell, etc. in addition to conventional combined power generation.

This example shows a closed-loop gas turbine (steam turbine) combined power generation system that burns H2 with 02 to obtain steam for reforming, but the water supplied from outside for steam for reforming is evaporated by an exhaust gas boiler. If used in this manner, the conventional combined cycle power generation system and PA type fuel cell power generation system shown in FIGS. 7 and 8 can also be considered. These power generation systems are
A reformer 21 that reforms NG into H2 and CO, a hydrogen separation means 22 that separates H2 from the reformed gas and supplies the remaining gas to the reformer 21 as reforming fuel, and this hydrogen separation It is composed of power generation means 23, 23A that generates electricity using H2 supplied from the means 22 as fuel, and an oxygen supply means 26 that supplies H2 to the reformer 21.
At A, the reformed gas H2 is used as fuel to generate electricity, while the reformed gases CO and 02 are introduced into the reformer 21 to obtain reforming heat and to be recovered as CO2. In the power generation system shown in FIG. 7, H2 supplied from the hydrogen separation means 22 is combusted with air in the gas turbine 23, and the combustion exhaust gas is recovered in the exhaust gas boiler 24 to drive the steam turbine. The water supplied to the vessel 21 is heated. In addition, in the case of the power generation system shown in FIG. 7, H2 supplied from the hydrogen separation means 22 is PA
After being used for power generation in the type fuel cell, the unconsumed water is returned to the reformer 21 and used as a heat source for reforming, while the water is converted to heat in the heat exchanger 28 using the heat of the cathode gas. It is heated and supplied to the reformer 21.

Through the LNG (methane) reforming reaction in the reformer 21, a reformed gas of CO and H2 is obtained from LNG. When this reformed gas H2 is combusted at 02 in the gas turbine 23, all of the combustion gas becomes water vapor. Here, H
Considering a closed-loop gas turbine system 27 based on 20, after heat is recovered in the exhaust heat recovery boiler 24, steam is further compressed fi.
It was decided to pressurize at 28. In addition, in some cases compression 8
! Part of the steam pressurized in 28 is extracted, the pressure is further increased in compressor 28, and the pressure is increased to be supplied to reformer 21.

For example, 3 moles of steam is mixed with 1 mole of carbon in LNG, heated by exchanging heat with the reformer outlet gas in the LNG preheater 31, and then supplied to the reformer 21. The reformed gas exchanges heat with LNG in the LNG preheater 31, and then cools it by exchanging heat with the gas returned to the reforming combustor 21a in the reformed gas heat exchanger 32, and then lowers the temperature to a relatively low temperature and performs hydrogen separation. It is guided to a device (hydrogen separation membrane) 22. Then, H2 is separated from it, 85% of which is supplied to the gas turbine 23, and the remaining gas containing CO is sent to the reforming combustor 21a.
will be returned to.

The H2 gas separated by the hydrogen separation membrane 22 is transferred to the H2 preheater 35.
After being preheated, it is supplied to the combustor 30 of the gas turbine 23, and is combusted in steam, which is a working fluid, by an oxygen supply means, for example, O2 supplied from the oxygen separator 26 mentioned above. At this time, only H2O is generated depending on the combustion. The combustion gas that has completed its work in the gas turbine 29 is guided to the exhaust heat recovery boiler 24, cooled to a predetermined temperature, and its exhaust heat is recovered. The steam obtained in the exhaust heat recovery boiler 24 rotates the steam turbine 25 to generate electricity, is condensed in the condenser 41, and is returned to the exhaust heat recovery boiler 24 again.

Mana, working fluid H'20 exiting the exhaust heat recovery boiler 24
A part of the increased amount due to combustion is discharged outside the system, while the remaining part is pressurized in the compressor 28 and then extracted in the branch system 46 to become LN.
Mix it with G.

On the other hand, the combustion gas at the exit of the reformer undergoes power recovery in the expansion turbine 37, is heated in the preheater 40, and is further heated in the condenser 3.
It is cooled at step 9 to condense and remove water and fish content, and only CO2 is recovered. Note that the rotation of the expansion turbine 37 rotates the steam booster 36, and the remainder is used for power generation work. Further, reference numerals 472, 43, 44 in the figure are generators, and 45 is a drive motor.

According to the inventor's estimate, the heat balance of this system is that the generating end output < 151 MW (3 units)) When converted to a 100 OMW base, the gas turbine output is 453 MW (151 MW 3 units)
The steam turbine output will be 479 MW, the expansion turbine output will be 68 MW, the amount of LNG to be supplied will be 135.3 ton/h, and the amount of CO2 to be recovered will be 189,000 Nm'/h (372 ton/h). Become.

Further, FIG. 3 shows another embodiment of the present invention. In this system, LNG is reformed in a reformer 51 and 1. fuel cell 52
At the same time, 002 is recovered from the reformer outlet gas, and this reformer outlet gas is circulated and supplied to the oxygen electrode of the fuel cell 52. The fuel cell 52 does not consume all of the supplied fuel, but consumes about 80% of it for power generation, leaving a portion of it, for example, about 20%. Therefore, the remaining 20%
The H2 and CO are returned to the reformer 31 and combusted by an oxygen supply means, such as O2 supplied from the oxygen separator 53 mentioned above, to obtain reforming reaction heat.

Therefore, the reformer outlet gas consists of CO2 and excess 02 not used for combustion. This reformer outlet gas is supplied to the oxygen electrode side of the fuel cell 52. Furthermore, the fuel cell 52
The C02 and remaining O2 discharged from the oxygen electrode are again combined with the reformer outlet gas and supplied to oxygen. That is, a recycle gas closed loop system 54 is constructed in which gas discharged from the oxygen electrode is guided to the oxygen electrode again. The concentration of CO2 in this recycled gas closed loop system 54 is high, while the CO2 contained in the reformer outlet gas is recovered outside the system by a CO2 separation and recovery means, such as a pressure fluctuation CO2 separation device 55. At this time, since the CO2 concentration is very high, it is efficiently recovered.

A specific example of this power generation system, that is, the LNG reforming 02-blown MC type fuel cell power generation system is shown in FIG. In this system, the LNG reformer 51 is the same as the system shown in FIG. The difference is that CO and H2 gases (e.g., anode gas fuel utilization rate μ6 = about 80%) are guided to the reforming combustor 51 and used as a heat source for reforming. water content (1-1
20) is evaporated with the cathode outlet gas in the evaporator 71, and is further evaporated in the superheaters 62, 60 and the anode gas heat exchanger 5.
The temperature of the fuel is raised through the filter 9 and the fuel is supplied to the reformer 51 . On the other hand,
The anode outlet gas is supplied to the anode gas heat exchanger 59, 61,
64, after being cooled by heat exchange with the superheater 60, 62 and the I, N, G preheater 63, H20 is condensed and removed in the condenser 65, and then pressurized with the anode gas blower 66, and the anode gas is again After being heated in heat exchangers 64, 61, and 59, it is supplied to the reforming combustor 51a. Reforming combustor 51 of reformer 51
In a, the amount of fuel remaining in the anode outlet gas (20% H
2 and CO) and O2 supplied from an oxygen supply means, such as the aforementioned O2 separation device 53, via the compressor 67 and the anode gas heat exchanger 59 are combusted. The reformer outlet gas consisting of CO2 and residual 02 generated by this combustion is
Supplied to the cathode (oxygen electrode) 58 of the MC type fuel cell,
Used for power generation. Note that 02 is pressurized by a motor-driven compressor 67 and then heated in an anode gas heat exchanger 59 before being supplied to the reforming combustor 51a.

At this time, in the MC type fuel cell 52, the anode 5711
In 11, )12±CO32-+H20MoC022eCO+CO
On the cathode 58 side, a reaction of CO2+1/202 +2e-"CO32 occurs. The generated CO32- passes through the electrolyte and passes through the rear anode electrode 5.
Move to the 7 side. In addition, the cathode recycle gas is 700
Since the temperature is as high as 0.degree. C., power is generated by an expansion turbine 70, and the exhaust gas is used to evaporate anode condensed water in an evaporator 71 to produce LNG reforming steam.

Here, if the 02 utilization rate of the cathode 58 is, for example, 25% (one pass), 02 is 4.8% by recycled gas.
Molar circulation is desirable.

Further, in the MC type fuel cell 52, since it is necessary to maintain the operating temperature at 700° C. or lower, the temperature is adjusted using cathode recycled CO2 gas.

Furthermore, 0.021 moles of carbon supplied by LNG is recovered by a pressure fluctuation CO2 separator 55 (PSA CO2). In this case, the required power and equipment are CO of raw material gas.
2 concentration is high (for example, C02:02 = 84:
16Vo1%) and about 4% of the recycled gas, it can be done with significantly less power and equipment than conventional methods. After the recycled gas is pressurized by the compressor 73, it is again supplied to the cathode 58 of the fuel cell.

According to the inventor's trial calculation, the heat balance of this system is calculated based on the generating end output of 10,100 O.
The amount of G (methane) is 110,8 tons/h, and the CO2 recovered is 156,000 Nm3/h (304,6 tons/h).
h).

It should be noted that although the above-described embodiment is an example of a preferred embodiment of the present invention, the present invention is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, implementation B in Figures 1 and 2 employs a combined power generation system with a gas turbine and a steam turbine, but the system is not limited to this, and the combustion gas discharged from the gas turbine is The heat may be recovered in a boiler and then the steam itself may be used.

(Effects of the Invention) As is clear from the above explanation, the thermal power generation system of the present invention generates only 002 gas through combustion, or eliminates the cause of 002 generation from the fuel, so C02 CO2 can be recovered without a separator or with a relatively small-scale oxygen separator.

Moreover, both systems can reduce the amount of exhaust gas and eliminate the generation of NOx in the combustion gas, making a denitrification device unnecessary. Furthermore, the transmission end efficiency of the thermal power generation system of the present invention is the same as or higher than that of current boiler-fired thermal power.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram showing an embodiment of the CO2 recovery type thermal power generation system of the present invention. FIG. 2 is a principle diagram showing another embodiment of the CO2 recovery type thermal power generation system of the present invention. FIG. 3 is a principle diagram showing still another embodiment of the CO2 recovery type thermal power generation system of the present invention. FIG. 4 is a system configuration diagram showing a power generation system that is a concrete example of the embodiment shown in FIG. FIG. 5 is a system configuration diagram showing a power generation system that is a concrete example of the embodiment shown in FIG. FIG. 6 is a system configuration diagram showing a power generation system that is a concrete example of the embodiment shown in FIG. FIG. 7 and FIG. 8 are principle diagrams showing modifications of the CO2 recovery type thermal power generation system shown in FIG. 2, respectively. DESCRIPTION OF SYMBOLS 1... Reheat power turbine, 2... Exhaust heat recovery boiler, 3... Closed loop heat cycle using C02 as working fluid, 4... Oxygen supply means, 21... Reformer, 22... - H2 separation means, 23... Gas turbine, 24... Exhaust heat recovery boiler, 26... Oxygen supply means, Closed loop heat cycle using O as working fluid, 1... Reformer, 2... - Fuel cell, 3... Oxygen supply means, 4... Recycling gas closed loop system, 5... CO2 separation means. 27...H2

Claims (1)

[Scope of Claims] (1) A closed-loop heat cycle including at least a Rehito gas turbine and a boiler for recovering exhaust heat from its combustion gas, and using carbon dioxide as a working fluid, wherein the Rehito gas turbine liquefies natural A carbon dioxide recovery type thermal power generation system that burns gas with a theoretical amount of pure oxygen and extracts and recovers the carbon dioxide increased by the combustion outside the system. (2) A reformer that reforms liquefied natural gas into hydrogen and carbon monoxide, and a hydrogen separation means that separates hydrogen from the reformed gas and supplies the remaining gas to the reformer as reforming fuel. , a power generation means for generating power using hydrogen supplied from the hydrogen separation means as fuel, and an oxygen supply means for supplying oxygen to the reformer, and the power generation means generates power using hydrogen in the reformed gas as fuel. On the other hand, a carbon dioxide recovery type thermal power generation system is characterized in that carbon monoxide and oxygen of the reformed gas are introduced into a reformer to obtain reforming heat and are recovered as carbon dioxide. (3) The carbon dioxide recovery type thermal power generation system according to claim 2, wherein the power generation means includes at least a gas turbine and a boiler that recovers exhaust heat from the combustion gas. (4) The carbon dioxide recovery type thermal power generation system according to claim 2, wherein the power generation means is a fuel cell. (5) A closed-loop heat cycle that includes at least a gas turbine and a boiler that recovers exhaust heat from its combustion gas and uses steam as a working medium, and a reformer that reforms liquefied natural gas to hydrogen and carbon monoxide. , hydrogen separation means for separating hydrogen from the reformed gas and supplying it to the gas turbine while supplying the remaining gas to the reformer as reforming fuel; and oxygen supplying oxygen to the gas turbine and the reformer. a supply means, which extracts and excludes water produced by burning the hydrogen and pure oxygen of the reformed gas from the closed loop system in the gas turbine, while reforming the carbon monoxide and oxygen of the reformed gas. A carbon dioxide recovery type thermal power generation system that is characterized by introducing heat into a vessel to obtain reforming heat and recovering it as carbon dioxide. (6) The carbon dioxide recovery type thermal power generation system according to any one of claims 1, 3, and 5, characterized in that the steam obtained from the boiler drives a steam turbine to perform combined power generation. (7) Consisting of a reformer, a fuel cell and an oxygen supply means,
LNG is reformed in the reformer, the resulting reformed gas is supplied to the fuel electrode of the fuel cell, and carbon monoxide and hydrogen not consumed in the fuel cell are combined with oxygen from the oxygen supply means. is introduced into the reformer and used as a heat source for reforming, and the reformed outlet gas is supplied to the oxygen electrode of the fuel cell, while carbon dioxide and oxygen are circulated as working fluids to the oxygen electrode of the fuel cell. A carbon dioxide recovery type thermal power generation system that constitutes a recycled gas closed loop system and recovers carbon dioxide generated by combustion from this recycled gas.