WO2015058370A1 - Combined cycle power plant with heat storage device - Google Patents

Combined cycle power plant with heat storage device Download PDF

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Publication number
WO2015058370A1
WO2015058370A1 PCT/CN2013/085769 CN2013085769W WO2015058370A1 WO 2015058370 A1 WO2015058370 A1 WO 2015058370A1 CN 2013085769 W CN2013085769 W CN 2013085769W WO 2015058370 A1 WO2015058370 A1 WO 2015058370A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
storage device
phase
change material
heat storage
Prior art date
Application number
PCT/CN2013/085769
Other languages
French (fr)
Inventor
Bo Wu
Liqiang Yao
Original Assignee
General Electric Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Company filed Critical General Electric Company
Priority to PCT/CN2013/085769 priority Critical patent/WO2015058370A1/en
Publication of WO2015058370A1 publication Critical patent/WO2015058370A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
    • F01K3/20—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters with heating by combustion gases of main boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Definitions

  • Embodiments of the present disclosure relate generally to a combined cycle power plant and more particularly to one or more heat storage devices positioned within a heat recovery steam generator (HRSG).
  • HRSG heat recovery steam generator
  • a combined cycle power plant utilizes a gas turbine and a steam turbine in combination to produce power.
  • the power plant is arranged such that the gas turbine is thermally connected to the steam turbine through a HRSG.
  • the HRSG employs heat from the exhaust gases of the gas turbine to create steam for expansion in the steam turbine.
  • the primary efficiency of the combined cycle arrangement is the utilization of the otherwise wasted heat from the gas turbine exhaust gases.
  • Combined cycle power plants may not make the most efficient transfer of waste energy to the steam turbine. Thus, there is a desire for a combined cycle power plant that provides increased efficiency.
  • a combined cycle power plant may include an engine that generates an exhaust gas.
  • the combined cycle power plant may also include a HRSG configured to transfer excess energy from the exhaust gas to create steam.
  • the combined cycle power plant may include at least one heat storage device positioned within the HRSG. The at least one heat storage device may be configured to store and release excess energy from the exhaust gas to create additional steam.
  • the combined cycle power plant may include a steam turbine configured to receive the steam from the HRSG and the at least one heat storage device.
  • the HRSG may include an exhaust gas flue configured to receive an exhaust gas, a superheater positioned within the exhaust gas flue, an evaporator positioned within the exhaust gas flue downstream of and in communication with the superheater, and at least one heat storage device positioned within the exhaust gas flue between the superheater and the evaporator.
  • the at least one heat storage device may be configured to store and release excess energy from the exhaust gas.
  • the method may include providing an exhaust gas to a heat recovery steam generator configured to transfer excess energy from the exhaust gas to create steam.
  • the method may also include positioning at least one airfoil shaped heat storage device within the heat recovery steam generator.
  • the at least one airfoil shaped heat storage device may include a phase-change material configured to store and release excess energy from the exhaust gas to create additional steam.
  • the method may include providing the steam from the heat recovery steam generator and the at least one airfoil shaped heat storage device to a steam turbine.
  • FIG. 1 is a schematic of an example diagram of a combined cycle power plant, according to an embodiment.
  • FIG. 2 is a schematic of an example diagram of a HRSG, according to an embodiment.
  • FIG. 3 is a schematic of an example diagram of a heat storage device, according to an embodiment. DETAILED DESCRIPTION OF THE DISCLOSURE
  • Illustrative embodiments are directed to, among other things, a combined cycle power plant having one or more heat storage devices positioned within a HRSG.
  • Fig. 1 depicts an example schematic view of a combined cycle power plant 100 as may be used herein.
  • the combined cycle power plant 100 may include a gas turbine 101 having a compressor 102.
  • the compressor 102 may compress an incoming flow of air 108.
  • the compressor 102 may deliver the compressed flow of air 109 to a combustor 104.
  • the combustor 14 may mix the compressed flow of air 109 with a pressurized flow of fuel 110 and ignite the mixture to create a flow of combustion gases 112.
  • the gas turbine engine 101 may include any number of combustors 104.
  • the flow of combustion gases 1 12 may be delivered to a turbine 106.
  • the flow of combustion gases 112 may drive the turbine 106 so as to produce mechanical work.
  • the mechanical work produced in the turbine 106 may drive the compressor 102 via a shaft 114 and an external load 116, such as an electrical generator or the like.
  • the gas turbine engine 101 may use natural gas, various types of syngas, and/or other types of fuels.
  • the gas turbine engine 101 may be any one of a number of different gas turbine engines offered by General Electric Company of Schenectady, New York, including, but not limited to, those such as a 7 or a 9 series heavy duty gas turbine engine and the like.
  • the gas turbine engine 101 may have different configurations and may use other types of components.
  • the gas turbine engine may be an aeroderivative gas turbine, an industrial gas turbine, or a reciprocating engine. Other types of gas turbine engines also may be used herein. Multiple gas turbine engines, other types of turbines, and other types of power generation equipment also may be used herein together.
  • the hot exhaust gases 118 exiting the gas turbine engine 101 may be supplied to at least one HRSG 122.
  • the HRSG 122 may recover heat from hot exhaust gases 118 exiting the gas turbine engine 101 and employ the heat to create steam 126 for expansion in the steam engine 128.
  • the steam engine 128 may drive an external load 130, such as an electrical generator or the like.
  • the HRSG 122 may have one or more pressure sections, such as a high-pressure section, an intermediate -pressure section, and a low- pressure section. Each pressure section may include any combination of evaporators, superheaters, and/or economizers.
  • Each of these components typically includes a bundle of tubes across which the hot exhaust gases 118 flow, transferring heat from the hot exhaust gases 118 to a fluid (e.g., water 120) flowing through the tubes.
  • the evaporator may include feedwater flowing through its tubes, and the hot exhaust gases 118 may cause the feedwater to turn to steam.
  • the superheater may include steam flowing through its tubes, and the hot exhaust gases 118 may heat the steam to create superheated steam.
  • the economizer may include feedwater flowing through its tubes, and the hot exhaust gases 118 may preheat the feedwater for use in the evaporator.
  • the exhaust gas may exit the HRSG 122 as cool exhaust gas 124.
  • steam 134 may be extracted from the steam engine 128 and supplied to a heating and cooling application 136.
  • steam 132 may be extracted from the HRSG 122 (e.g., from an intermediate pressure section and/or a low pressure section) and supplied to the heating and cooling application 136.
  • the combined cycle power plant 100 may further include heating and cooling capabilities.
  • the HRSG 202 may include at least one evaporator 210 and at least one superheater 212.
  • the evaporator 210 may be in fluid communication with a water source by way of at least one water delivery pipe 216.
  • the evaporator 210 may be in fluid communication with the superheater 212 by way of at least one steam delivery pipe 218.
  • the HRSG 202 may define a flow path (i.e., a gas flue 204) for the hot exhaust gases 206 exiting a gas turbine.
  • the superheater 212 is usually positioned upstream of the evaporator 210, and the economizer (not shown) is usually positioned downstream of the evaporator 210, so that the hot exhaust gases flow 206 over the superheater 212, the evaporator 210, and the economizer in succession.
  • the economizer (not shown) is usually positioned downstream of the evaporator 210, so that the hot exhaust gases flow 206 over the superheater 212, the evaporator 210, and the economizer in succession.
  • HRSG configurations can be employed.
  • the hot exhaust gases flowing 206 through the HRSG 202 may superheat the steam flowing through the superheater 212 to create superheated steam 220, which may be provided to a steam turbine for expansion therein.
  • the HRSG 202 may include a heat storage device 214.
  • the heat storage device 214 may be in fluid communication with a water source by way of at least one water delivery pipe 222.
  • the hot exhaust gases flowing 206 through the HRSG 202 may heat the water flowing through the heat storage device 214 to create steam 224, which may be provided to a steam turbine for expansion therein.
  • the heat storage device 214 may be positioned between the superheater 212 and the evaporator 210 in the high-pressure section 200 of the HRSG 202.
  • the heat storage device 214 may be positioned anywhere within the HRSG 202, including the high-pressure section, the intermediate -pressure section, and the low-pressure section.
  • FIG. 3 is a schematic of an example heat storage device 300.
  • the heat storage device 300 may be configured to store and release excess energy from the hot exhaust gas 308 to create additional steam to supply to a steam generator.
  • at least a portion of the heat storage device 300 may be formed of a phase-change material 304.
  • the phase -change material of the heat storage device 300 may extract heat from the hot exhaust gas 308 from the gas turbine.
  • the heat may be stored within the heat storage device 300 by the phase-change material 304 and used to create additional steam for a steam generator.
  • the phase-change material 304 in the heat storage device 300 may absorb redundant heat from hot exhaust gas 308 and melt into a liquid.
  • the phrase-change material 304 may release the stored heat and generate additional steam. That is, the phrase-change material 304 in the heat storage device 300 may discharge latent heat and sensible heat sufficient to increase steam supply flow to a steam turbine to meet, for example, peak steam demands in the daytime during peak load.
  • the phrase-change material 304 may absorb redundant heat from hot exhaust gas 308 of the gas turbine.
  • the heat storage device 300 may be shaped like an airfoil or the like, such as the generally symmetric wing shape depicted in FIG. 3.
  • the airfoil shape of the heat storage device 300 may be configured to reduce pressure loss within the gas flue of the HRSG.
  • the heat storage device 300 may include an outer shell 302, a phase-change material 304 within the outer shell 302, and one or more steam/water pipes 306 disposed at least partially within the outer shell 302 and interstitial of the phase-change material 304.
  • the phase-change material 304 is configured to store and release excess energy from the hot exhaust gas 308 as the phase-change material 304 changes from solid to liquid and vice versa.
  • the one or more steam/water pipes 306 may be configured to supply water to the heat storage device 300 by way of, for example, at least one water delivery pipe 310.
  • the phase-change material 304 stores and releases excess energy from the hot exhaust gas 308, the water within the one or more steam/water pipes 306 is turned into steam.
  • the steam may then be supplied to a steam turbine or the like by way of, for example, at least one steam delivery pipe 312.
  • the phase-change material 304 may include a melting temperature between about 536F (280C) and 626F (330C). The melting temperature, however, may be any temperature and/or range of temperatures.
  • the phase-change material 304 may be ferric chloride (FeCl 3 ), potassium nitrate (KN0 3 ), sodium nitrate (NaN0 3 ), a compound thereof or the like.
  • FeCl 3 ferric chloride
  • KN0 3 potassium nitrate
  • NaN0 3 sodium nitrate
  • the composition and/or melting temperature of the phase-change material 304 may vary depending on the location of the heat storage device 300 within the HRSG and vice versa.
  • the outer shell 302 and/or the one or more steam/water piping 306 may be carbon steel, titanium, or the like. Further, the outer shell 302 and/or the one or more steam/water piping 306 may be corrosion resistant. For example, the outer shell 302 and/or the one or more steam/water piping 306 may include a Zn-Ni alloy coating, a modified silicone-alkyd resin coating, and/or an enamel coating to protect against corrosion.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

A combined cycle power plant is provided herein. The combined cycle power plant may include an engine that generates an exhaust gas. The combined cycle power plant may also include a heat recovery steam generator (HRSG) configured to transfer excess energy from the exhaust gas to create steam. Further, the combined cycle power plant may include at least one airfoil shaped heat storage device positioned within the HRSG. The at least one airfoil shaped heat storage device may comprise a phase-change material configured to store and release excess energy from the exhaust gas to create additional steam. Moreover, the combined cycle power plant may include a steam turbine configured to receive the steam from the HRSG and the at least one airfoil shaped heat storage device.

Description

COMBINED CYCLE POWER PLANT WITH HEAT STORAGE DEVICE
FIELD OF THE DISCLOSURE
[0001] Embodiments of the present disclosure relate generally to a combined cycle power plant and more particularly to one or more heat storage devices positioned within a heat recovery steam generator (HRSG).
BACKGROUND OF THE DISCLOSURE
[0002] A combined cycle power plant utilizes a gas turbine and a steam turbine in combination to produce power. The power plant is arranged such that the gas turbine is thermally connected to the steam turbine through a HRSG. The HRSG employs heat from the exhaust gases of the gas turbine to create steam for expansion in the steam turbine. The primary efficiency of the combined cycle arrangement is the utilization of the otherwise wasted heat from the gas turbine exhaust gases. Combined cycle power plants, however, may not make the most efficient transfer of waste energy to the steam turbine. Thus, there is a desire for a combined cycle power plant that provides increased efficiency.
BRIEF DESCRIPTION OF THE DISCLOSURE
[0003] Some or all of the above needs and/or problems may be addressed by certain embodiments of the present disclosure. According to an embodiment, there is disclosed a combined cycle power plant. The combined cycle power plant may include an engine that generates an exhaust gas. The combined cycle power plant may also include a HRSG configured to transfer excess energy from the exhaust gas to create steam. Further, the combined cycle power plant may include at least one heat storage device positioned within the HRSG. The at least one heat storage device may be configured to store and release excess energy from the exhaust gas to create additional steam. Moreover, the combined cycle power plant may include a steam turbine configured to receive the steam from the HRSG and the at least one heat storage device. [0004] According to another embodiment, there is disclosed a HRSG. The HRSG may include an exhaust gas flue configured to receive an exhaust gas, a superheater positioned within the exhaust gas flue, an evaporator positioned within the exhaust gas flue downstream of and in communication with the superheater, and at least one heat storage device positioned within the exhaust gas flue between the superheater and the evaporator. The at least one heat storage device may be configured to store and release excess energy from the exhaust gas.
[0005] Further, according to another embodiment, there is disclosed a method. The method may include providing an exhaust gas to a heat recovery steam generator configured to transfer excess energy from the exhaust gas to create steam. The method may also include positioning at least one airfoil shaped heat storage device within the heat recovery steam generator. The at least one airfoil shaped heat storage device may include a phase-change material configured to store and release excess energy from the exhaust gas to create additional steam. Moreover, the method may include providing the steam from the heat recovery steam generator and the at least one airfoil shaped heat storage device to a steam turbine.
[0006] Other embodiments, aspects, and features of the disclosure will become apparent to those skilled in the art from the following detailed description, the
accompanying drawings, and the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:
[0008] FIG. 1 is a schematic of an example diagram of a combined cycle power plant, according to an embodiment.
[0009] FIG. 2 is a schematic of an example diagram of a HRSG, according to an embodiment.
[0010] FIG. 3 is a schematic of an example diagram of a heat storage device, according to an embodiment. DETAILED DESCRIPTION OF THE DISCLOSURE
[0011] Illustrative embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. The present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like numbers refer to like elements throughout.
[0012] Illustrative embodiments are directed to, among other things, a combined cycle power plant having one or more heat storage devices positioned within a HRSG. Fig. 1 depicts an example schematic view of a combined cycle power plant 100 as may be used herein. The combined cycle power plant 100 may include a gas turbine 101 having a compressor 102. The compressor 102 may compress an incoming flow of air 108. The compressor 102 may deliver the compressed flow of air 109 to a combustor 104. The combustor 14 may mix the compressed flow of air 109 with a pressurized flow of fuel 110 and ignite the mixture to create a flow of combustion gases 112. Although only a single combustor 104 is shown, the gas turbine engine 101 may include any number of combustors 104. The flow of combustion gases 1 12 may be delivered to a turbine 106. The flow of combustion gases 112 may drive the turbine 106 so as to produce mechanical work. The mechanical work produced in the turbine 106 may drive the compressor 102 via a shaft 114 and an external load 116, such as an electrical generator or the like.
[0013] The gas turbine engine 101 may use natural gas, various types of syngas, and/or other types of fuels. The gas turbine engine 101 may be any one of a number of different gas turbine engines offered by General Electric Company of Schenectady, New York, including, but not limited to, those such as a 7 or a 9 series heavy duty gas turbine engine and the like. The gas turbine engine 101 may have different configurations and may use other types of components. The gas turbine engine may be an aeroderivative gas turbine, an industrial gas turbine, or a reciprocating engine. Other types of gas turbine engines also may be used herein. Multiple gas turbine engines, other types of turbines, and other types of power generation equipment also may be used herein together.
[0014] The hot exhaust gases 118 exiting the gas turbine engine 101 may be supplied to at least one HRSG 122. The HRSG 122 may recover heat from hot exhaust gases 118 exiting the gas turbine engine 101 and employ the heat to create steam 126 for expansion in the steam engine 128. The steam engine 128 may drive an external load 130, such as an electrical generator or the like. The HRSG 122 may have one or more pressure sections, such as a high-pressure section, an intermediate -pressure section, and a low- pressure section. Each pressure section may include any combination of evaporators, superheaters, and/or economizers. Each of these components typically includes a bundle of tubes across which the hot exhaust gases 118 flow, transferring heat from the hot exhaust gases 118 to a fluid (e.g., water 120) flowing through the tubes. For example, the evaporator may include feedwater flowing through its tubes, and the hot exhaust gases 118 may cause the feedwater to turn to steam. The superheater may include steam flowing through its tubes, and the hot exhaust gases 118 may heat the steam to create superheated steam. The economizer may include feedwater flowing through its tubes, and the hot exhaust gases 118 may preheat the feedwater for use in the evaporator. The exhaust gas may exit the HRSG 122 as cool exhaust gas 124.
[0015] In some instances, steam 134 may be extracted from the steam engine 128 and supplied to a heating and cooling application 136. Similarly, steam 132 may be extracted from the HRSG 122 (e.g., from an intermediate pressure section and/or a low pressure section) and supplied to the heating and cooling application 136. In this manner, the combined cycle power plant 100 may further include heating and cooling capabilities.
[0016] An example configuration of a high-pressure section 200 of a HRSG 202 is shown in FIG. 2. The HRSG 202 may include at least one evaporator 210 and at least one superheater 212. The evaporator 210 may be in fluid communication with a water source by way of at least one water delivery pipe 216. The evaporator 210 may be in fluid communication with the superheater 212 by way of at least one steam delivery pipe 218. The HRSG 202 may define a flow path (i.e., a gas flue 204) for the hot exhaust gases 206 exiting a gas turbine. To make the most efficient use of the waste energy in the hot exhaust gases 206, the superheater 212 is usually positioned upstream of the evaporator 210, and the economizer (not shown) is usually positioned downstream of the evaporator 210, so that the hot exhaust gases flow 206 over the superheater 212, the evaporator 210, and the economizer in succession. However, a wide range of HRSG configurations can be employed. The hot exhaust gases flowing 206 through the HRSG 202 may superheat the steam flowing through the superheater 212 to create superheated steam 220, which may be provided to a steam turbine for expansion therein.
[0017] In certain embodiments, the HRSG 202 may include a heat storage device 214. The heat storage device 214 may be in fluid communication with a water source by way of at least one water delivery pipe 222. The hot exhaust gases flowing 206 through the HRSG 202 may heat the water flowing through the heat storage device 214 to create steam 224, which may be provided to a steam turbine for expansion therein. In some instances, the heat storage device 214 may be positioned between the superheater 212 and the evaporator 210 in the high-pressure section 200 of the HRSG 202. However, the heat storage device 214 may be positioned anywhere within the HRSG 202, including the high-pressure section, the intermediate -pressure section, and the low-pressure section.
[0018] FIG. 3 is a schematic of an example heat storage device 300. In certain embodiments, the heat storage device 300 may be configured to store and release excess energy from the hot exhaust gas 308 to create additional steam to supply to a steam generator. In some instances, at least a portion of the heat storage device 300 may be formed of a phase-change material 304. For example, the phase -change material of the heat storage device 300 may extract heat from the hot exhaust gas 308 from the gas turbine. The heat may be stored within the heat storage device 300 by the phase-change material 304 and used to create additional steam for a steam generator. For example, at partial-load operation (such as in the evening) the phase-change material 304 in the heat storage device 300 may absorb redundant heat from hot exhaust gas 308 and melt into a liquid. Conversely, during peak load (e.g., in the daytime), the phrase-change material 304 may release the stored heat and generate additional steam. That is, the phrase-change material 304 in the heat storage device 300 may discharge latent heat and sensible heat sufficient to increase steam supply flow to a steam turbine to meet, for example, peak steam demands in the daytime during peak load. On the other hand, during the partial - load operating hours, the phrase-change material 304 may absorb redundant heat from hot exhaust gas 308 of the gas turbine.
[0019] In certain embodiments, the heat storage device 300 may be shaped like an airfoil or the like, such as the generally symmetric wing shape depicted in FIG. 3. The airfoil shape of the heat storage device 300 may be configured to reduce pressure loss within the gas flue of the HRSG. In some instances, the heat storage device 300 may include an outer shell 302, a phase-change material 304 within the outer shell 302, and one or more steam/water pipes 306 disposed at least partially within the outer shell 302 and interstitial of the phase-change material 304. Again, the phase-change material 304 is configured to store and release excess energy from the hot exhaust gas 308 as the phase-change material 304 changes from solid to liquid and vice versa. In this manner, the one or more steam/water pipes 306 may be configured to supply water to the heat storage device 300 by way of, for example, at least one water delivery pipe 310. As the phase-change material 304 stores and releases excess energy from the hot exhaust gas 308, the water within the one or more steam/water pipes 306 is turned into steam. The steam may then be supplied to a steam turbine or the like by way of, for example, at least one steam delivery pipe 312.
[0020] In an example embodiment, the phase-change material 304 may include a melting temperature between about 536F (280C) and 626F (330C). The melting temperature, however, may be any temperature and/or range of temperatures. In another example embodiment, the phase-change material 304 may be ferric chloride (FeCl3), potassium nitrate (KN03), sodium nitrate (NaN03), a compound thereof or the like. However, any phase-change material may be used herein, and any single or combination of phase-change materials may be used herein. The composition and/or melting temperature of the phase-change material 304 may vary depending on the location of the heat storage device 300 within the HRSG and vice versa. In yet another example embodiment, the outer shell 302 and/or the one or more steam/water piping 306 may be carbon steel, titanium, or the like. Further, the outer shell 302 and/or the one or more steam/water piping 306 may be corrosion resistant. For example, the outer shell 302 and/or the one or more steam/water piping 306 may include a Zn-Ni alloy coating, a modified silicone-alkyd resin coating, and/or an enamel coating to protect against corrosion.
[0021] Although embodiments have been described in language specific to structural features and/or methodological acts, it is to be understood that the disclosure is not necessarily limited to the specific features or acts described. Rather, the specific features and acts are disclosed as illustrative forms of implementing the embodiments.

Claims

CLAIMS THAT WHICH IS CLAIMED:
1. A combined cycle power plant, comprising:
an engine that generates an exhaust gas;
a heat recovery steam generator configured to transfer excess energy from the exhaust gas to create steam;
at least one heat storage device positioned within the heat recovery steam generator, the at least one heat storage device configured to store and release excess energy from the exhaust gas to create additional steam; and
a steam turbine configured to receive the steam from the heat recovery steam generator and the at least one heat storage device.
2. The combined cycle power plant of claim 1, wherein the heat recovery steam generator comprises:
an exhaust gas flue configured to receive the exhaust gas;
a superheater positioned within the exhaust gas flue; and
an evaporator positioned within the exhaust gas flue downstream of and in communication with the superheater, wherein the at least one heat storage device is positioned within the exhaust gas flue between the superheater and the evaporator.
3. The combined cycle power plant of claim 2, wherein the superheater comprises a high pressure superheater and the evaporator comprises a high pressure evaporator.
4. The combined cycle power plant of claim 1, wherein the at least one heat storage device comprises an airfoil.
5. The combined cycle power plant of claim 1, wherein the at least one heat storage device comprises: an outer shell;
a phase-change material within the outer shell; and
steam/water piping disposed at least partially within the outer shell and interstitial of the phase-change material.
6. The combined cycle power plant of claim 5, wherein the phase -change material is configured to store and release excess energy from the exhaust gas as the phase-change material changes from solid to liquid and vice versa.
7. The combined cycle power plant of claim 5, wherein the phase -change material comprises a melting temperature between about 536F (280C) and 626F (330C).
8. The combined cycle power plant of claim 5, wherein the phase-change material comprises one or more of: ferric chloride (FeCl3), potassium nitrate (KN03), sodium nitrate (NaN03), a compound thereof or the like.
9. The combined cycle power plant of claim 1, wherein the at least one heat storage device is at least partially corrosion resistant.
10. The combined cycle power plant of claim 1, wherein the engine is an
aeroderivative gas turbine, an industrial gas turbine, or a reciprocating engine.
11. A heat recovery steam generator, comprising:
an exhaust gas flue configured to receive an exhaust gas;
a superheater positioned within the exhaust gas flue;
an evaporator positioned within the exhaust gas flue downstream of and in communication with the superheater; and at least one heat storage device positioned within the exhaust gas flue between the superheater and the evaporator, the at least one heat storage device configured to store and release excess energy from the exhaust gas.
12. The heat recovery steam generator of claim 11 , wherein the superheater comprises a high pressure superheater and the evaporator comprises a high pressure evaporator.
13. The heat recovery steam generator of claim 11, wherein the at least one heat storage device comprises an airfoil.
14. The heat recovery steam generator of claim 11, wherein the at least one heat storage device comprises:
an outer shell;
a phase-change material within the outer shell; and
steam/water piping disposed at least partially within the outer shell and interstitial of the phase-change material.
15. The heat recovery steam generator of claim 14, wherein the phase -change material is configured to store and release excess energy from the exhaust gas as the phase-change material changes from solid to liquid and vice versa.
16. The combined cycle power plant of claim 14, wherein the phase-change material comprises a melting temperature between about 536F (280C) and 626F (330C).
17. The combined cycle power plant of claim 14, wherein the phase-change material comprises one or more of: ferric chloride (FeCl3), potassium nitrate (KN03), sodium nitrate (NaN03), a compound thereof or the like.
A method, comprisi providing an exhaust gas to a heat recovery steam generator configured to transfer excess energy from the exhaust gas to create steam;
positioning at least one airfoil shaped heat storage device within the heat recovery steam generator, the at least one airfoil shaped heat storage device comprising a phase- change material configured to store and release excess energy from the exhaust gas to create additional steam; and
providing the steam from the heat recovery steam generator and the at least one airfoil shaped heat storage device to a steam turbine.
19. The method of claim 18, further comprising:
positioning an outer shell about the phase-change material; and
positioning steam/water piping at least partially within the outer shell and interstitial of the phase-change material.
20. The method of claim 18, wherein the phase-change material is configured to store and release excess energy from the exhaust gas as the phase-change material changes from solid to liquid and vice versa.
PCT/CN2013/085769 2013-10-23 2013-10-23 Combined cycle power plant with heat storage device WO2015058370A1 (en)

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EP3306044A1 (en) * 2016-10-04 2018-04-11 General Electric Company Fast frequency response systems with thermal storage for combined cycle power plants

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US20090121495A1 (en) * 2007-06-06 2009-05-14 Mills David R Combined cycle power plant
US20110283706A1 (en) * 2010-05-19 2011-11-24 Diego Fernando Rancruel System and methods for pre-heating fuel in a power plant
CN102787944A (en) * 2011-05-18 2012-11-21 J·埃贝斯佩歇合资公司 Exhaust heat utilisation device

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US20090121495A1 (en) * 2007-06-06 2009-05-14 Mills David R Combined cycle power plant
US20110283706A1 (en) * 2010-05-19 2011-11-24 Diego Fernando Rancruel System and methods for pre-heating fuel in a power plant
CN102787944A (en) * 2011-05-18 2012-11-21 J·埃贝斯佩歇合资公司 Exhaust heat utilisation device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3306044A1 (en) * 2016-10-04 2018-04-11 General Electric Company Fast frequency response systems with thermal storage for combined cycle power plants

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