Search

JP-2026514331-A - System and method having an oxidant supply unit for a duct burner of a heat recovery steam generator

JP2026514331AJP 2026514331 AJP2026514331 AJP 2026514331AJP-2026514331-A

Abstract

The system includes a duct burner configured to add combustion heat to exhaust gases led through a heat recovery steam generator (HRSG), a fuel supply unit configured to supply fuel to the duct burner, and an oxidizer supply unit configured to supply an oxidizer to the duct burner. The system also includes a control device having a memory, a processor, and instructions stored in the memory, which are executable by the processor, to control the fuel supply unit to supply fuel to the duct burner, and to control the oxidizer supply unit to supply an oxidizer to the duct burner, the control of the oxidizer supply unit being based on a comparison of the oxygen content in the exhaust gas with an oxygen threshold. [Selection Diagram] Figure 2

Inventors

  • サマック、マジェド
  • クルカルニ、パラグ ピー．
  • アゴスティネッリ、ジャン ルイジ
  • フルチャー、スティーブン ケー．
  • ショールズ、ジョン イー．
  • ヨーク、ミシェル ジー．

Assignees

  • ジーイー・ベルノバ・テクノロジー・ゲーエムベーハー

Dates

Publication Date
20260511
Application Date
20230331

Claims (20)

  1. It is a system, A duct burner (24) is configured to add heat from combustion to exhaust gas (184) that is guided through a heat recovery steam generator (HRSG) (16), A fuel supply unit (28) configured to supply fuel to the duct burner (24), An oxidizing agent supply unit (26) is configured to supply an oxidizing agent (244) to the duct burner (24), A control device (220), comprising a memory (226), a processor (224), and instructions stored in the memory (226), The fuel supply unit (28) is controlled to supply the fuel to the duct burner (24), The oxidant supply unit (26) is controlled to supply the oxidant (244) to the duct burner (24), and the control of the oxidant supply unit (26) is based on a comparison of the oxygen content in the exhaust gas (184) and the oxygen threshold. A control device (220) having instructions (228) that can be executed by the processor (224), A system equipped with these features.
  2. The control device (220) is Upon receiving feedback indicating the oxygen content in the exhaust gas (184), The comparison is obtained by comparing the oxygen content with respect to the oxygen threshold. If the oxygen content is less than the oxygen threshold, the flow of the oxidizing agent (244) from the oxidizing agent supply unit (26) is started or increased to increase the oxygen content. The system according to claim 1, configured as follows.
  3. The control device (220) is If the oxygen content is above the oxygen threshold, the flow of the oxidizing agent (244) from the oxidizing agent supply unit (26) is stopped or reduced to reduce the oxygen content. The system according to claim 2, configured as follows.
  4. The control device (220) is The oxidizer supply unit (26) is controlled in at least a first control mode to start or increase the flow of the oxidizer (244) to the duct burner (24), and the first control mode includes an exhaust gas recirculation (EGR) control mode. The system according to claim 1, configured as follows.
  5. The control device (220) is The oxidizer supply unit (26) is controlled in at least a second control mode to stop or reduce the flow of the oxidizer (244) to the duct burner (24), the second control mode including a non-EGR control mode. The system according to claim 4, configured as described above.
  6. The system according to claim 1, comprising: the HRSG (16); a gas turbine system (12) located upstream of the HRSG (16); and an exhaust gas recirculation (EGR) system configured to recirculate at least a portion of the exhaust gas (184) to the gas turbine system (12).
  7. The system according to claim 6, comprising a gas treatment system (18) configured to treat the exhaust gas (184), wherein the gas treatment system (18) comprises a gas capture system (20) configured to capture gas from the exhaust gas (184).
  8. The system according to claim 7, wherein the gas capture system (20) comprises a carbon capture system, and the gas contains carbon dioxide ( CO2 ).
  9. The system according to claim 1, wherein the oxidizing agent supply unit (26) comprises an ejector (246) configured to supply the oxidizing agent (244) via a power fluid (250).
  10. The system according to claim 9, wherein the ejector (246) comprises a variable ejector having a drive device coupled to a variable nozzle, the drive device being configured to adjust the cross-section of the variable nozzle, and the variable nozzle being configured to flow the power fluid (250).
  11. The system according to claim 9, wherein the ejector (246) comprises an oxidizer inlet, a power fluid inlet, a convergence passage (326), a throat (328), and a diffusion passage (330).
  12. The system according to claim 9, wherein the power fluid (250) includes a compressor bleed flow from a compressor (254) of a gas turbine system (12) configured to output the exhaust gas (184), the compressor bleed flow includes exhaust gas recirculation (EGR) compressed by the compressor (254), and the oxidizer (244) includes air.
  13. The system according to claim 1, wherein the oxidizer supply unit (26) comprises a compressor (254) driven by a steam turbine.
  14. The system according to claim 1, wherein the oxidizing agent supply unit (26) comprises a compressor (254) driven by an electric motor.
  15. The system according to claim 1, wherein the duct burner (24) comprises an injection grid (290) having a plurality of fuel ports (298) and a plurality of oxidizer ports (296).
  16. It is a system, A control device (220), comprising a memory (226), a processor (224), and instructions stored in the memory (226), The fuel supply unit (28) is controlled to supply fuel to the duct burner (24) of the heat recovery steam generator (HRSG) (16), and the duct burner (24) is configured to add heat from combustion to the exhaust gas (184) that is guided through the HRSG (16). The oxidizer supply unit (26) is controlled to supply the oxidizer (244) to the duct burner (24), and the control of the oxidizer supply unit (26) is based on a comparison of the oxygen content in the exhaust gas (184) and the oxygen threshold. A control device (220) having instructions (228) that can be executed by the processor (224), A system equipped with these features.
  17. The control device (220) is Upon receiving feedback indicating the oxygen content in the exhaust gas (184), The comparison is obtained by comparing the oxygen content with respect to the oxygen threshold. If the oxygen content is less than the oxygen threshold, the flow of the oxidizing agent (244) from the oxidizing agent supply unit (26) is started or increased to increase the oxygen content. If the oxygen content is above the oxygen threshold, the flow of the oxidizing agent (244) from the oxidizing agent supply unit (26) is stopped or reduced to reduce the oxygen content. The system according to claim 16, configured as described above.
  18. The control device (220) is The oxidizer supply unit (26) is controlled in at least a first control mode to start or increase the flow of the oxidizer (244) to the duct burner (24), and the first control mode includes an exhaust gas recirculation (EGR) control mode. The oxidizer supply unit (26) is controlled in at least a second control mode to stop or reduce the flow of the oxidizer (244) to the duct burner (24), and the second control mode includes a non-EGR control mode. The system according to claim 16, configured as described above.
  19. It is a method, The control device (220) controls the fuel supply unit (28) to supply fuel to the duct burner (24) of the heat recovery steam generator (HRSG) (16), wherein the duct burner (24) is configured to add heat from combustion to the exhaust gas (184) guided through the HRSG (16), The control device (220) controls the oxidizer supply unit (26) to supply the oxidizer (244) to the duct burner (24), wherein the control of the oxidizer supply unit (26) is based on a comparison between the oxygen content in the exhaust gas (184) and an oxygen threshold. Methods that include...
  20. Controlling the oxidizing agent supply unit (26) means Receiving feedback indicating the oxygen content in the exhaust gas (184), The comparison is obtained by comparing the oxygen content with respect to the oxygen threshold, If the oxygen content is less than the oxygen threshold, the flow of the oxidizing agent (244) from the oxidizing agent supply unit (26) is started or increased to increase the oxygen content. If the oxygen content is above the oxygen threshold, the flow of the oxidizing agent (244) from the oxidizing agent supply unit (26) is stopped or reduced to decrease the oxygen content. The method according to claim 19, including the method described in claim 19.

Description

This application generally relates to a system and method for supplying an oxidizer to a duct burner of a heat recovery steam generator (HRSG) located downstream of a combustion system (e.g., a gas turbine system), such as during exhaust gas recirculation (EGR) mode. Industrial plants, such as combustion-driven power plants, may include HRSGs for generating steam using heat from exhaust gases produced by the combustion system. The combustion system may include gas turbine engines, reciprocating piston cylinder engines, furnaces, or other industrial equipment. Exhaust gases may contain one or more undesirable gases, such as acidic gases and/or greenhouse gases. For example, undesirable gases may include carbon oxides ( CO₂ ) such as carbon dioxide (CO₂) and carbon monoxide ( CO ), nitrogen oxides ( NO₂ ) such as nitrogen dioxide ( NO₂ ), and/or sulfur oxides ( SO₂ ) such as sulfur dioxide ( SO₂ ). CO₂ is both an acidic gas and a greenhouse gas. Therefore, the use of gas treatment systems and/or exhaust gas recirculation (EGR) systems can help reduce the emission of undesirable gases. For example, an EGR system reduces NO₂ by lowering the oxygen content in the exhaust gas by replacing a portion of the intake air with recirculated exhaust gas. Unfortunately, low oxygen content can complicate the steam generation process in the HRSG. As a result, heat must be applied to the HRSG while addressing the low oxygen content in the exhaust gas (for example, insufficient oxygen for the duct burner). European Patent Application Publication No. 3287612 The following summarizes specific embodiments corresponding to the scope of the subject matter originally claimed. These embodiments are not intended to limit the scope of the claimed embodiments, but rather to provide a brief overview of possible forms of the subject matter. Indeed, the claimed embodiments may include various forms that may be similar to or different from the embodiments described below. The system includes a duct burner configured to add combustion heat to exhaust gases guided through a heat recovery steam generator (HRSG), a fuel supply unit configured to supply fuel to the duct burner, and an oxidizer supply unit configured to supply oxidizer to the duct burner. The system also includes a control device having memory, a processor, and instructions stored in memory, which are executable by the processor, for controlling the fuel supply unit to supply fuel to the duct burner and controlling the oxidizer supply unit to supply oxidizer to the duct burner, with the control of the oxidizer supply unit being based on a comparison of the oxygen content in the exhaust gas with an oxygen threshold. The system includes a control device having a memory, a processor, and instructions stored in the memory, which are executable by the processor and control a fuel supply unit to supply fuel to a duct burner of a heat recovery steam generator (HRSG). The duct burner is configured to add combustion heat to the exhaust gases leading through the HRSG. The control device is also configured to control an oxidizer supply unit to supply an oxidizer to the duct burner, and the control of the oxidizer supply unit is based on a comparison of the oxygen content in the exhaust gases with an oxygen threshold. The method includes controlling a fuel supply unit via a control device to supply fuel to a duct burner of a heat recovery steam generator (HRSG), wherein the duct burner is configured to add combustion heat to the exhaust gases guided through the HRSG. The method further includes controlling an oxidizer supply unit via a control device to supply an oxidizer to the duct burner, wherein the control of the oxidizer supply unit is based on a comparison between the oxygen content in the exhaust gases and an oxygen threshold. These, as well as other features, aspects, and advantages of the technology disclosed herein will be better understood by reading the following detailed description with reference to the accompanying drawings, where, throughout the drawings, similar reference numerals represent similar parts. This is a block diagram of one embodiment of a combined cycle system comprising a gas turbine system, a steam turbine system, a heat recovery steam generator (HRSG), a gas processing system having one or more gas capture systems, and a thermal control system having a duct burner coupled to the HRSG.Figure 1 is a schematic diagram of one embodiment of a combined cycle system, showing one embodiment of a thermal control system having multiple oxidizer supply units and fuel supply units coupled to a duct burner.Figures 1 and 2 are flowcharts of one embodiment of the process for operating the combined cycle system, and show the control logic for operating the thermal control system.Figures 1 and 2 are flowcharts of one embodiment of the process for operating the combined cycle system, and show the control logic for operating the thermal control system. The following describes