Hydrogen-fueled gas turbine power generation system and method of operating same

Abstract

A hydrogen-fueled gas turbine power system includes a compressor (22), a combustor (24), a turbine (26), and a fuel supply (10). The fuel supply (10) is in the form of a hydrogen gas production reactor system having at least one reactor (12) based on absorption-enhanced steam methane reforming (SE-SMR) and / or absorption-enhanced water-gas shift (SE-WGS) of syngas. The reactor (12) is connected in a closed loop to a regenerator (14) that regenerates a CO2 absorbent by circulating it between the reactor (12) and the regenerator (14). Additionally, a closed heat exchange loop (21) exists between the regenerator (14) of the hydrogen gas production reactor system (10) and at least one of the downstream end of the combustor (24) of the hydrogen-fueled gas turbine (20) and the upstream end of the turbine (26) of the hydrogen-fueled gas turbine (20) to increase the temperature within the regenerator (14) and decrease the temperature at the upstream end of the turbine (26) of the hydrogen-fueled gas turbine (20). Methods of use thereof are also contemplated.

Description

[Technical field]

[0001] The present invention relates to a hydrogen-fueled gas turbine power plant as set forth in the preamble of claim 1. According to another aspect, the present invention relates to a method for generating electrical power in a hydrogen-fueled gas turbine power plant as set forth in the preamble of claim 10. [Background technology]

[0002] Carbon Capture and Storage (CCS) constitutes a set of technologies being developed to mitigate the adverse effects of anthropogenic climate change by separating the CO2 generated during the combustion of fuels (e.g. gas, liquid hydrocarbons, coal, biomass) and from CO2-emitting industries (steel, aluminum, silicon, ferrosilicon, cement, etc.). CO2 capture can be performed in three main ways: post-combustion, pre-combustion, and by combustion in nearly pure oxygen. The separated CO2 can be utilized and / or sequestered in geological formations.

[0003] Historically, in pre-combustion capture situations, hydrogen or hydrogen-rich gases have resulted in combustion temperatures that are too high for conventional gas turbines.

[0004] However, recent technological developments such as pre-mixing of fuel and air, development of burners for hydrogen-rich fuels, and development of high temperature material systems (master alloys / superalloys, bond coats and thermal barrier coatings) have made it possible to capture CO2 before combustion for use in hydrogen-fueled gas turbines.

[0005] Hydrogen-fuel can be produced efficiently (in one process step) from clean, desulfurized synthesis gas (of any origin) or from natural gas and water by a process known as Sorption Enhanced Water Gas Shift (SE-WGS) and / or Sorption Enhanced Steam Methane Reforming (SE-SMR). The process is also called Sorption Enhanced Reforming (SER) and is characterized by the use of CaO as a CO2 absorbent (see WO 2011 / 078681 and the US Department of Energy). In the case of post-combustion capture, the process is also called Ca-looping (Dean at al.: 2011) (EP 1495794).

[0006] The following reactions occur (depending on the fuel used): a) Hydrogen is produced from synthesis gas (a gas with varying hydrogen and CO content) using absorption enhanced water gas shift (SE-WGS), as exemplified by the following reaction: CaO+CO+H2+H2O=CaCO3+2H2

[0007] b) Hydrogen is produced from natural gas (mainly CH4) by absorption-enhanced steam methane reforming (SE-SMR), exemplified by the following reaction: CaO+CH4+2H2O=CaCO3+4H2

[0008] c) Hydrogen is produced from a mixture of synthesis gas and natural gas (or methane-rich gas) according to the following "equation" (which is not balanced): CaO+CO+H2+CH4+H2O=CaCO3+H2

[0009] The temperatures of all reactions are between 500°C and 650°C. These reactions are slightly exothermic and may need to be cooled by adding water or by heat exchange. Reaction c) represents the sum of reactions a) and b). If the amount of CaO-CO2 absorbent is large enough to accommodate all the carbon in the reactions, all reactions will result in the same products (calcite and hydrogen) regardless of the proportion of syngas and natural gas in the fuel mixture introduced to the hydrogen production unit.

[0010] The hydrogen production unit includes a CO2 absorbent regenerator (calciner), in which solid calcium carbonate (CaCO3) generated in the hydrogen production process is regenerated according to the following reaction: CaCO3 = CaO + CO2

[0011] When this highly endothermic process (requiring approximately 850-950°C) is carried out without the use of hydrocarbon fuels (or fuels containing CO), the total amount of CO2 can be captured at "100% purity" and utilized and / or stored.

[0012] It is very important that this endothermic regeneration process is carried out at sustainable cost and energy efficiency. This can be achieved by providing heat or waste heat, which can be transferred in two different ways: directly or indirectly. Direct heat transfer involves oxy-combustion of fuel and therefore requires the use of an Air Separation Unit (ASU). Indirect heat exchange requires the incorporation of a high temperature heat exchanger in the regenerator. This heat can be extracted from a high temperature fuel cell (SOFC) (similar to WO 2011 / 078681).

[0013] Another option would be to use a high temperature generator to calcinate the calcium carbonate, as suggested very briefly in WO 01 / 42132, but this publication is silent as to how such calcination should be carried out.

[0014] Other publications in this field are U.S. Patent Application Publication No. 2008 / 155984, U.S. Patent Application Publication No. 2007 / 0130957, U.S. Patent Application Publication No. 2008 / 0141643, U.S. Patent Application Publication No. 2008 / 0161428, and U.S. Patent No. 5,490,377.

[0015] Conventional natural gas turbines may have temperatures that are too low for the CaO-CO2 sorbent regeneration reaction to occur efficiently, whereas hydrogen-fueled gas turbines suffer from high combustor end and turbine inlet temperatures but may benefit from the cooling provided by an efficient heat exchange loop. Summary of the Invention [Problem to be solved by the invention]

[0016] It is an object of the present invention to provide a cost-effective and energy-efficient hydrogen fueled gas turbine power plant capable of operating under sustainable conditions, and a secondary object is to mitigate the problem of excessive temperatures at the combustor end and / or inlet of the hydrogen fueled gas turbine.

[0017] It is a further subsidiary object to provide a method for operating such a power plant.

[0018] The essential aim is to provide a power plant in which CO2 is captured very effectively. [Means for solving the problem]

[0019] The above object is achieved by the present invention, which comprises a hydrogen-fueled gas turbine power plant as defined in claim 1 according to a first aspect.

[0020] According to another aspect, the invention relates to a method as defined by claim 10.

[0021] Preferred embodiments are disclosed by the dependent claims.

[0022] Sustainability is the keyword and common denominator for the whole process exemplified by the fact that the present invention allows for integrated CO2 capture. The heat transfer loop between the end of the combustor and / or the inlet of the turbine on one side of a hydrogen-fueled gas turbine and the regenerator (or calciner) on the other side includes a hollow ring-shaped compartment at the downstream end of the combustor or the inlet of the turbine. The heat transfer medium can be, for example, hydrogen, water vapor, CO2, air, helium, fluids such as mixed gases or mineral oils, hydrocarbons, and various types of molten salts.

[0023] Thus, according to the present invention, the high temperatures required for regeneration of the CaO sorbent are ensured by a specially designed heat exchange loop between the downstream (hot) end of the combustor or the upstream end of the turbine of a hydrogen-fueled gas turbine, where temperatures can reach 1800°C to 1900°C, and the CaO sorbent regenerator.

[0024] It is worth mentioning that gas turbines, including hydrogen-fueled gas turbines, encompass many different configurations and overall designs, and the present invention is applicable to all of these configurations and designs. For example, with respect to the combustor chamber(s) of a gas turbine, one or more combustor chambers may be formed as an annular chamber between the compressor and the turbine in some embodiments, and may have a common axis with the compressor and turbine axes. In other embodiments, the combustor chamber may be divided into two or more separate combustor chambers, each of which is positioned offset from the compressor and turbine axes. Thus, two, three, or four separate can combustor chambers may be positioned in parallel around the axis connecting the compressor and the turbine. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic diagram showing a first embodiment of the present invention. [Figure 2a] FIG. 2a is a schematic diagram illustrating a second embodiment of the present invention. [Figure 2b] FIG. 2b is a schematic diagram showing a variant of the second embodiment of the present invention. [Diagram 3] FIG. 3 is a schematic diagram showing a third embodiment of the present invention. [Figure 4] FIG. 4 is a schematic diagram showing a fourth embodiment of the present invention. [Diagram 5] FIG. 5 is a schematic diagram showing a fifth embodiment of the present invention. [Figure 6a] FIG. 6a is a cross-sectional view showing two variants of a detail of the invention. [Figure 6b] FIG. 6b is a cross-sectional view showing two variants of a detail of the invention. [Figure 7] FIG. 7 is a schematic diagram showing a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Various embodiments of the present invention will now be described with reference to the accompanying drawings.

[0027] Referring now to Figure 1, the power generation system is generally composed of a hydrogen-fueled gas turbine 20 and a fuel supply 10. The fuel supply 10 is mainly composed of i) a reactor or reformer 12 arranged to receive water (H2O) 3 and a base fuel 1, which in the embodiment of Figure 1 is methane (CH4) or a methane-rich gas, and ii) a regenerator 14. The hydrogen-fueled gas turbine 20 is composed of the following main components: i) a compressor 22, ii) a combustor 24 (having cylindrical compartments at the ends for heat exchange) arranged to receive a flow of hydrogen (H2) 17 from the reactor 12 and compressed air 23 from the compressor 22, and iii) a turbine 26 arranged to receive hot combustion gases 25 from the combustor 24 and thereby generate electricity 29. In addition to generating electrical energy, the turbine can also propel mechanical devices for various purposes.

[0028] 1, the fuel reformer 10 is based on the SE-SMR (or SER) method of hydrogen production and is arranged in a pre-CO2 combustion situation. A CaO containing CO2-absorbent regenerator 14 and an indirect heat transfer system 21 between the hot (downstream) end of a hydrogen-fueled gas turbine combustor 24 and the CO2-absorbent regenerator 14 provides the heat required for the release of CO2 and allows a substantially pure CO2 flow 19 to exit the regenerator 14.

[0029] The heat transferred by the indirect heat transfer system 21 is collected by a ring 28 at the downstream end of the combustor 24 and released in a heat exchanger of the regenerator 14 to form a closed heat exchange loop (21) between the regenerator (14) of the hydrogen gas production reaction system (10) and at least one of the downstream end of the combustor (24) of the hydrogen-fueled gas turbine (20) and the upstream end of the turbine (26) of the hydrogen-fueled gas turbine.

[0030] The CH4 fuel flow 1 is fed to a reactor 12, which is part of a hydrogen-fuel supply system configured to reform the fuel and treat the CO2 released in the reforming process SE-SMR (or SER) by a CaO-containing absorbent. In the embodiment of FIG. 1, the fuel is a methane-rich gas such as methane or natural gas. A substantially pure hydrogen 17 gas leaves the reformer unit. In the reactor 12, the reforming process involves a reaction between the fuel (CH4), water (steam) and CaO, which is converted to CaCO3 in an exothermic reaction. The CaCO3 produced from the CO2 in the reforming process is then regenerated to CaO in an endothermic process to be described. The reactor 12 is also fed with water 3 in vaporized form.

[0031] Substantially pure hydrogen gas 17 exits the reformer and is delivered to a combustor 24 (or combustor section) of a hydrogen fueled gas turbine. Compressed air 23 from a compressor 22 of the hydrogen fueled gas turbine 20 is also delivered to the combustor 24. The hydrogen gas 17 and compressed air 23 may be premixed (not shown) before being delivered to the combustor 24. The mixture is combusted at high temperature, typically at a temperature of about 1800°C to 1900°C.

[0032] A stream of high temperature, high pressure gases 25 enters a turbine 26 where it expands to generate electricity.

[0033] As mentioned above, the CaCO3 13 produced in the reformer unit needs to be regenerated to CaO 15 for reuse as a CO2 capturing agent in the reactor 12. This is done in the regenerator 14 which forms the second part of the hydrogen-fuel supply system 10.

[0034] The regeneration of CaCO3 requires temperatures of about 850°C to 950°C to operate efficiently. It is an endothermic process that consumes energy. At normal pressure, the process is carried out at temperatures of about 870°C and above. This is therefore the preferred embodiment. The energy, i.e. heat, required for this process is provided by the combustor 24 of the hydrogen-fueled gas turbine according to the invention. A closed thermal loop, for example with hydrogen as heat carrier, circulates between the hot end of the combustor 24 and the energy-requiring regenerator 14 of the fuel supply system. This thermal loop has two functions:

[0035] 1) To provide sufficient heat, approximately 900°C, required for the regeneration of the CaO-containing CO2 absorbent, and 2) To assist in cooling of the associated turbine components to levels acceptable for long-term stable operation of hydrogen-fueled gas turbines by reducing the need for dilution air to the turbine.

[0036] The closed loop heat exchange medium can be any medium capable of handling the temperatures experienced in combustor 24, and should preferably be capable of handling temperatures of about 1800°C to 1900°C.

[0037] The total amount of CO2 from this pre-combustion CO2 capture process is released from the regenerator and can be captured, stored, and / or utilized.

[0038] The high quality exhaust gases 27 (N2, H2O, and O2) exiting the turbine 26 at temperatures in excess of 500° C. can optionally be used for a variety of purposes. The heat 11 from the exothermic SE-SMR reaction likewise has optional uses. The heat 11 can be used, for example, in a gasification plant to convert solid carbonaceous material into more readily usable gases such as syngas or natural gas, or it may be used to preheat the air from the compressor 22.

[0039] 2, which illustrates a power plant, in which a hydrogen-fueled gas turbine is combined with a syngas-based fuel reformer (i.e., the SE-WGS method of hydrogen production) placed in a pre-CO2 combustion situation. A CaO-containing CO2 absorbent regenerator 14 and an indirect heat exchange system 21 between the hydrogen-fueled gas turbine combustor 24 and the CO2 absorbent regenerator 14 provide heat for absorbent regeneration and release CO2 19 for CO2 capture, storage, and / or utilization.

[0040] Most of the components in Figure 2a are the same as those in Figure 1. The main difference between Figure 1 and Figure 2 is that the fuel 1' supplied to the hydrogen gas fuel supply is synthesis gas. In addition, the ring-shaped member 28' of the heat transfer system 21 is somewhat wider than the ring-shaped member 28 shown in Figure 1, allowing for a larger contact area with the hot combustion gases 25 exiting the combustor 24, thereby enabling a higher heat transfer rate.

[0041] FIG. 2b is essentially the same as FIG. 2a, except that a ring-shaped member 28″ of the heat transfer system partially covers or constitutes the downstream region of the combustor 24 and partially the upstream end of the turbine 26, thereby further increasing the contact surface area with the hot combustion gases 25.

[0042] Although shown with respect to an embodiment in which syngas is the fuel, it should be understood that the different embodiments of the ring-shaped members 28, 28' and 28" will function similarly with natural gas as the fuel or a combination of the two fuels.

[0043] 3, which illustrates a power plant, where hydrogen in a pre-combustion state is produced by the SE-SMR hydrogen production process for use in a hydrogen-fueled gas turbine. In this embodiment, heat from the hot exhaust gases leaving the turbine is recovered for high pressure steam generation by the steam turbine 32 to produce additional power / electricity 29'.

[0044] Most of the components in Figure 3 are the same as those in Figure 1. The main difference between Figure 1 and Figure 3 is that additional power is produced by a steam turbine 32, a configuration known as a combined cycle. To this end, the hot exhaust gases from the turbine 26 are used to generate steam in a steam generator 30, which is supplied to the steam turbine 32.

[0045] 4, which illustrates a power plant, where hydrogen in a pre-combustion state is produced from syngas in a SE-WGS hydrogen production process for use in a hydrogen-fueled gas turbine. In this embodiment, heat from the hot exhaust gas 27 leaving the turbine 26 is recovered for high pressure steam generation by a steam turbine to produce additional power / electricity.

[0046] Most of the components in Figure 4 are the same as those in Figures 2a and 2b. The difference between Figures 2b and 4, as already explained with reference to Figure 3, is primarily that additional power 29' is produced by a steam generator 30 in combination with a steam turbine 32, a configuration known as a combined cycle.

[0047] It should be emphasized that all of the embodiments described herein may include the additional step of generating electricity as described with reference to FIGS.

[0048] Attention is now directed to FIG. 5, which illustrates a power plant, where hydrogen in a pre-combustion state can alternatively be produced for use in a hydrogen-fueled gas turbine from a source of natural gas (or methane) by the SE-SMR hydrogen production process, or from a source of syngas by the SE-WGS hydrogen production process, or from any combination of such sources. As described with reference to the previous embodiment, the CaO-containing CO2 absorbent regenerator 14 and the indirect heat transfer system 21 between the hydrogen-fueled gas turbine combustor 24 and the CO2 absorbent regenerator 14 provide heat for the regeneration of CaO and the release of CO2 for capture, storage and / or utilization. The system for CO2 capture is the same as described in all previous embodiments.

[0049] In FIG. 5, a common reactor / reformer 12 is shown to receive two feed gases. This means that the SE-SMR reforming reaction and the SE-WGS reaction take place simultaneously under the same conditions in the same reactor. It has been found that this does not constitute a problem. Alternatively, separate reactors / reformers may be used for each feed gas, CH4 and syngas. In such a case, the two reactors may be connected to a common regenerator or to separate regenerators. However, the simplest configuration is the one shown.

[0050] FIG. 5 also shows a separate H2 flow 16 for external use, illustrating the fact that the method and apparatus of the present invention allows for the simultaneous production of energy in the form of electricity, heat and high quality hydrogen.

[0051] The CaO-containing absorbent may simply be based on CaO obtained from natural rocks / minerals, but may also be a synthetically produced CaO-containing absorbent, for example of the kind described in WO 2011 / 005114. The advantage of such synthetic absorbers is that they withstand many regeneration cycles without losing significant absorption capacity.

[0052] Figures 6a and 6b show two alternative configurations of the ring-shaped member 28' shown in Figures 2a and 5. In the configuration shown in Figure 6a, the inlet 281 to the ring-shaped member 28' and the outlet 282 from the ring-shaped member 28' are adjacent to each other, and the heat transfer fluid flows in one direction, generally around the entire gap inside the ring-shaped member. The inside of the ring-shaped member 28'a may or may not be provided with ribs 283 that serve to increase the surface area that the hot combustion gases 25 contact on their way from the combustor 24 to the turbine 26. In the direction of gas flow through the compressor and the turbine, such ribs may have an extension that corresponds to or is smaller than the extension of the ring-shaped member. If ribs 283 are present, the size and profile of the ribs 283 will be adapted to the available space. The radial extension of the ribs 283 may vary along their length, as well as their thickness, to optimize the aerodynamic properties of the ribs 283, as well as their size. Optionally, the ribs may be slightly curved along their length to increase contact with the passing gas flow, and at least a portion of the ribs may be located in a longitudinal region of the turbine that is free of vanes occupying a portion of its cross section.

[0053] In FIG. 6b, the inlet 281 to the ring-shaped member 28'b and the outlet 282 from the ring-shaped member 28'b are located on opposite sides of each other, and the heat transfer fluid entering the gap in the ring-shaped member 28'b from the inlet is branched into two partial flows, each of which flows in a semicircle toward the outlet on the opposite side of the ring-shaped member 28'b.

[0054] For all of the embodiments shown, the ring-shaped members 28, 28', and 28" can have inlets and outlets in any of the configurations shown, as well as other configurations. Additionally, the ring-shaped members can be designed and configured to be replaceable when worn, such as by being connectable to the combustor 24 and turbine 26 with screws or the like.

[0055] When assembled into a hydrogen-fueled gas turbine, ring-shaped members 28, 28' and 28" become part of it and may be considered the downstream end of combustor 24, the upstream end of turbine 26, or a connection between the two.

[0056] The materials for the rings 28, 28' and 28" are selected from among materials having acceptable thermal conductivity and acceptable resistance to high temperatures. Thus, the materials typically selected for combustor and turbine walls, as discussed above, are good candidates.

[0057] FIG. 7 illustrates a different embodiment of the invention with respect to the combustor from the previous embodiments, in which the combustor is formed by two separate combustor chambers 24a, 24b offset from the axis between the compressor 22 and the turbine 26. Also, the heat exchange elements previously identified as features 28, 28' and 28" have been replaced by an axially offset heat exchanger 78 between the compressor 22 and the turbine 26. The offset location of the heat exchanger 78 means that it does not contribute to an increase in the length dimension of the turbine, allowing for the use of various types and sizes of heat exchange elements, thus greatly increasing the versatility of the system. This combination makes it easy to design the system in a way that allows fine tuning of the heat transferred to the regenerator 14. In FIG. 7, hot gas 25a is directed from the combustor 24a to the heat exchanger 78, and the same gas leaves the heat exchanger 78 at a slightly lower temperature as gas flow 25b, which is then directed to the turbine 26. Naturally, the flow path from the combustors 24a, 24b through the heat exchanger 78 and on to the turbine 26 must be shaped and dimensioned to accommodate a high velocity, efficient gas flow with an acceptably low pressure drop.

[0058] In all versions of the invention, additional heat exchange elements can be installed to those described, illustrated, and / or claimed, for example to cool hotter sections than are achieved by elements 28, 28' and 28" or 78.

[0059] Safety measures are essential in the turbine design and will not be described here but will mainly follow standards in the field, such as measures to immediately shut off fuel during load dump or emergency shutdown to prevent the turbine from overspeeding. Due to the large amount of energy stored in the heat exchangers during normal operation, additional safety measures can be implemented to prevent the turbine from overspeeding in these situations.

[0060] The present invention is a unique combination of technologies that allows for improved temperature control of the combustor and turbine of a hydrogen-fueled gas turbine power plant in a manner that utilizes heat extracted from the combustor in the most efficient manner in the regenerator for the CO2 absorber where temperature requirements are also an issue. This is achieved with a pre-combustion CO2 capture system, which is the most efficient way to capture CO2 in such power plants. This unique combination of advantages over the prior art makes the method and system of the present invention a good example of a synergistic invention.

Claims

1. The pre-combustion CO ２ 1. A hydrogen-fueled gas turbine power generation system with recovery, comprising: the turbine (26) being adapted for connection to auxiliary means for generating electricity in the form of electrical energy; The fuel supply (10) is in the form of a hydrogen gas production reactor system having at least one reactor (12) selected from the group consisting of: i) a reactor capable of supporting absorption enhanced steam methane reforming (SE-SMR) of methane, and ii) a reactor capable of supporting absorption enhanced water gas shift (SE-WGS) of syngas, or a combination of the two; The reactor (12) is a regenerator (14) between the reactor (12) and the regenerator (14). ２ The regenerator (14) is connected in a closed loop to circulate the absorbent to regenerate the absorbent; a closed heat exchange loop (21) exists between the regenerator (14) of the hydrogen gas production reactor system and at least one of a downstream end of the combustor (24) of a hydrogen fueled gas turbine (20) and an upstream end of a turbine (26) of the hydrogen fueled gas turbine, thereby increasing the temperature in the regenerator (14) to 900° C. and reducing the temperature at the upstream end of the turbine (26) of the hydrogen fueled gas turbine (20) to cool associated parts of the hydrogen fueled gas turbine (20). Hydrogen-fueled gas turbine power generation system.

2. 2. The hydrogen fueled gas turbine power generation system of claim 1, wherein the reactor (12) has an inlet conduit adapted to receive a gas flow from a methane rich source, from a syngas source, or from a combination of a methane rich source and a syngas source.

3. 3. The hydrogen fueled gas turbine power generation system of claim 1 or claim 2, wherein the reactor (12) has an inlet conduit adapted to receive a source of steam.

4. 4. A hydrogen fueled gas turbine power generation system according to claim 1, wherein the heat exchange medium for the heat exchange loop (21) is selected from among heat exchange media capable of handling temperatures up to at least 1500°C.

5. 5. The hydrogen fueled gas turbine power generation system of claim 1, further comprising a steam generator (30) configured to receive hot exhaust gas from the turbine (26) and to provide steam generated therein to a steam turbine (32) for additional power generation.

6. the closed heat exchange loop (21) between the regenerator (14) of the hydrogen gas production reactor system and at least one of a downstream end of the combustor (24) of the hydrogen fueled gas turbine (20) and an upstream end of the turbine (26) of the hydrogen fueled gas turbine, 6. The hydrogen-fueled gas turbine power generation system according to claim 1, further comprising an element (28, 28', 28") having the shape of a hollow ring having the same diameter as a downstream end of the combustor (24) and an upstream end of the turbine (26), connected between the combustor (24) and the turbine (26) and arranged to bridge the combustor (24) and the turbine (26).

7. 7. A hydrogen fueled gas turbine power generation system according to claim 6, wherein said hollow ring shaped element (28, 28', 28") is replaceable.

8. the closed heat exchange loop (21) between the regenerator (14) of the hydrogen gas production reactor system and at least one of a downstream end of the combustor (24) of the hydrogen fueled gas turbine (20) and an upstream end of the turbine (26) of the hydrogen fueled gas turbine, 6. The hydrogen fueled gas turbine power generation system of claim 1, further comprising a dedicated heat exchanger (78) arranged to cool exhaust gases from the combustor (24) prior to entering the turbine (26).

9. Pre-combustion CO ２ 1. A method for generating electricity in a hydrogen fueled gas turbine power plant with capture, comprising: providing a gas selected from the group consisting of methane-rich gas and syngas or a combination thereof to a hydrogen gas production reactor system comprising at least one reactor selected from the group consisting of i) a reactor capable of supporting absorption-enhanced steam methane reforming (SE-SMR) of methane, and ii) a reactor capable of supporting absorption-enhanced water gas shift (SE-WGS) of syngas; The gas provided is converted into hydrogen by at least one reaction selected from the group consisting of SE-SMR and SE-WGS, and natural or synthetic CaO-containing CO ２ The absorbent absorbs CO in the reactor. ２ and Pure CO at temperatures of at least 850°C ２ via a regeneration step that releases CO ２ Reusing the absorbent; supplying hydrogen gas produced in said hydrogen gas production reactor system along with compressed air to a combustor of a hydrogen fueled gas turbine and using the combined fuel mixture to power a turbine of said hydrogen fueled gas turbine downstream of said combustor; Including, The natural or synthetic CaO-containing CO ２ The CO2 is generated by exchanging heat between a regenerator for regenerating an absorbent and at least one of a downstream end of the combustor of the hydrogen-fueled gas turbine and an upstream end of a turbine of the hydrogen-fueled gas turbine. ２ The regeneration step of the absorbent is carried out at a temperature of at least 850° C. method.

10. 10. The method of claim 9, wherein the heat exchange is controlled in a manner that ensures a temperature of at least 872°C in the regeneration step.

11. 11. The method according to claim 9 or 10, wherein the heat (11) generated in the at least one reactor is used as an energy source for external purposes.

12. The method of claim 11, wherein the heat (11) is used for gasifying solid carbonaceous material.

Images