Steam generator using oxygen-hydrogen combustion

Abstract

The present invention provides a steam generator using oxygen-hydrogen combustion, which cools the combustor liner with a gas-phase cooling medium, eliminates heat loss due to the gas-phase cooling medium, and achieves high evaporation efficiency of water injected into the combustor liner. [Solution] The steam generator 1 of the embodiment includes a primary burner 10 to which hydrogen, oxygen necessary for the complete combustion of the hydrogen, and excess oxygen are supplied; a main burner 30 which is provided in a burner casing 32 and burns hydrogen and oxygen, a liner cooling passage 34 formed between the burner casing 32 and the combustor liner 33 and flows exhaust gas containing excess oxygen from the combustor liner 11 along the combustor liner 33; a fuel supply unit 35 that supplies hydrogen into the combustor liner 33; an oxidizer supply unit 36 ​​that supplies exhaust gas that has passed through the liner cooling passage 34 into the combustor liner 33; and a water injection unit 37 that injects water into the combustor liner 33.

Description

Technical Field

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[0005]

[0001] Embodiments of the present invention relate to a steam generator using hydrogen-oxygen combustion.

Background Art

[0002] In a steam generator that burns hydrogen and oxygen to generate steam, from the viewpoint of generating high-purity steam, it is preferable that the steam after combustion does not contain hydrogen and oxygen. Therefore, the mass ratio of hydrogen to oxygen to be burned (fuel-air ratio) is set to the theoretical (stoichiometric) fuel-air ratio. That is, the mass of hydrogen and the mass of oxygen are set so that the equivalence ratio becomes 1. The equivalence ratio is calculated by dividing the fuel-air ratio by the theoretical fuel-air ratio.

[0003] When oxygen and hydrogen burn under the condition of an equivalence ratio of 1, the flame temperature rises to nearly 3000°C. Considering, for example, a steam turbine or steam utilization equipment to which the steam generated in the steam generator is supplied, it is necessary to adjust the temperature of the steam to a level of 1000°C or lower. Therefore, it is necessary to lower the combustion temperature by water injection. <00所00014> In a conventional steam generator, after cooling the wall surface of the combustor liner with cooling water from the outside, a direct cooling method is used in which dilution water is injected into the combustor liner through a nozzle formed on the wall surface of the combustor liner, and the combustion temperature is lowered. The combustor liner is made of a copper-based material with good thermal conductivity, such as a copper-based material, in which the temperature difference between the outer wall surface and the inner wall surface is small in order to reduce the thermal stress due to water cooling.

Prior Art Documents

Non-Patent Documents

[0005] TIFF2026106499000002.tif30157

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the conventional steam generator described above, the temperature of the combustor liner is low, depending on the temperature of the cooling water in contact with the outer wall surface of the combustor liner. As a result, the dilution water injected from the nozzle that adheres to the inner wall surface of the combustor liner does not evaporate, and the evaporation efficiency of the dilution water decreases.

[0007] Furthermore, if the temperature of the combustor liner rises, the cooling water in contact with the outer wall surface of the combustor liner boils, causing it to lose its cooling effect. If the temperature of the combustor liner rises to, for example, around 400°C due to the reduced cooling effect of the cooling water, the strength and lifespan of the combustor liner, which is made of copper-based material, become problematic.

[0008] Furthermore, the supply pressure of the cooling water is often set lower than the supply pressure of the dilution water. Therefore, if the cooling water used to cool the outer wall surface of the combustor liner is not injected into the combustor liner itself, and is used only for indirect heat exchange, heat will be released to the outside, and this heat loss to the outside becomes a problem in terms of thermal efficiency.

[0009] The problem that this invention aims to solve is to provide a steam generator using oxygen-hydrogen combustion that cools the combustor liner with a gas-phase cooling medium, eliminates heat loss due to the gas-phase cooling medium, and achieves high evaporation efficiency of water injected into the combustor liner. [Means for solving the problem]

[0010] The steam generator using oxygen-hydrogen combustion according to this embodiment comprises a first combustor and a second combustor into which exhaust gas from the first combustor is introduced. The first combustor comprises a first combustor liner for burning hydrogen and oxygen, a first fuel supply unit for supplying hydrogen into the first combustor liner, and a first oxidizer supply unit for supplying oxygen and excess oxygen necessary for the complete combustion of the hydrogen supplied from the first fuel supply unit into the first combustor liner.

[0011] The second combustor comprises a first casing, a second combustor liner provided within the first casing for burning hydrogen and oxygen, a liner cooling channel formed between the first casing and the second combustor liner for allowing the exhaust gas containing the excess oxygen from the first combustor liner to flow along the second combustor liner, a second fuel supply unit for supplying hydrogen into the second combustor liner, a second oxidant supply unit for supplying the exhaust gas containing the excess oxygen that has passed through the liner cooling channel as an oxidant into the second combustor liner, and a water injection unit for injecting water into the second combustor liner. [Brief explanation of the drawing]

[0012] [Figure 1] This figure schematically shows the configuration of the steam generator and the various supply systems to the steam generator according to the first embodiment. [Figure 2] This is a diagram showing cross-section AA in Figure 1. [Figure 3] This figure schematically shows a longitudinal cross-section of the main burner in the steam generator of the second embodiment. [Figure 4] This figure schematically shows a longitudinal cross-section of the main burner in the steam generator of the third embodiment. [Figure 5] This figure schematically shows a longitudinal cross-section of the main burner in the steam generator of the fourth embodiment. [Modes for carrying out the invention]

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0014] (First Embodiment) Figure 1 is a schematic diagram showing the configuration of the steam generator 1 and various supply systems to the steam generator 1 according to the first embodiment. Figure 2 is a diagram showing the cross-section AA of Figure 1. The steam generator 1 functions as a steam generator using oxygen-hydrogen combustion.

[0015] As shown in Figure 1, the steam generator 1 comprises a primary burner 10 and a main burner 30 into which exhaust gas from the primary burner 10 is introduced. Figure 1 also shows cross-sections of the primary burner 10 and the main burner 30. The primary burner 10 functions as the first combustor, and the main burner 30 functions as the second combustor.

[0016] First, let's explain the configuration of the primary burner 10.

[0017] The primary burner 10 comprises a combustor liner 11, a fuel supply unit 12, and an oxidizer supply unit 13. The combustor liner 11 functions as a first combustor liner, the fuel supply unit 12 functions as a first fuel supply unit, and the oxidizer supply unit 13 functions as a first oxidizer supply unit.

[0018] The combustor liner 11 is composed of, for example, a cylindrical member with one end 11a closed and the other end 11b open. Inside the combustor liner 11, hydrogen supplied from the fuel supply unit 12 and oxygen supplied from the oxidizer supply unit 13 mix and burn.

[0019] The fuel supply unit 12 supplies hydrogen into the combustor liner 11. The fuel supply unit 12 is composed of, for example, a cylindrical member. The hydrogen is injected into the combustor liner 11 from the opening of the fuel supply unit 12 on the combustor liner 11 side. The fuel supply unit 12 is provided, for example, in the center of one end 11a of the combustor liner 11. In other words, the fuel supply unit 12 is positioned such that its central axis is coaxial with the central axis of the combustor liner 11.

[0020] The oxidizer supply unit 13 supplies oxygen and excess oxygen necessary for the complete combustion of hydrogen supplied from the fuel supply unit 12 into the combustor liner 11. In other words, the oxidizer supply unit 13 supplies excess oxygen in addition to the oxygen necessary for the complete combustion of hydrogen supplied from the fuel supply unit 12. This excess oxygen is the oxygen necessary for the complete combustion of hydrogen supplied from the fuel supply unit 35 of the main burner 30, which will be described later.

[0021] The oxidant supply unit 13 is constituted by, for example, an annular passage between the fuel supply unit 12 and a cylindrical member 14 provided on the outer periphery of the fuel supply unit 12. The cylindrical member 14 is arranged concentrically with the cylindrical member constituting the fuel supply unit 12, for example. Oxygen is injected into the combustor liner 11 from the opening on the side of the combustor liner 11 of the oxidant supply unit 13.

[0022] As described above, in the primary burner 10, a diffusion combustion method is adopted in which hydrogen and oxygen are separately supplied into the combustor liner 11 and burn.

[0023] Further, the primary burner 10 includes an ignition device 15 for igniting the mixture of hydrogen and oxygen in the combustor liner 11. The ignition device 15 is arranged at a predetermined position through the side wall of the combustor liner 11, for example.

[0024] Here, the exhaust gas discharged from the combustor liner 11 of the primary burner 10 contains water vapor and surplus oxygen generated by the combustion in the primary burner 10. Since the hydrogen supplied from the fuel supply unit 12 burns almost completely in the combustor liner 11, in principle, the exhaust gas does not contain hydrogen.

[0025] Next, the configuration of the main burner 30 will be described.

[0026] The main burner 30 includes a burner end member 31, a burner casing 32, a combustor liner 33, a liner cooling flow path 34, a fuel supply unit 35, an oxidant supply unit 36, and a water injection unit 37. Note that the burner end member 31 functions as a combustor end member, the burner casing 32 functions as a first casing, the combustor liner 33 functions as a second combustor liner, the fuel supply unit 35 functions as a second fuel supply unit, and the oxidant supply unit 36 functions as a second oxidant supply unit.

[0027] The burner end member 31 is a member that seals one end (upstream side) of the main burner 30. The upstream side refers to the upstream side with respect to the main flow direction of the fluid flowing inside the combustor liner 33 (from right to left in Figure 1). The downstream side refers to the side from which the fluid flows inside the combustor liner 33. The burner end member 31 is composed of, for example, a hollow frustoconical member. The frustoconical member is composed of a small-diameter section that is sealed on the upstream side and a large-diameter section that is open on the downstream side. The burner end member 31 is equipped with a fuel supply section 35, an oxidizer supply section 36, and a water injection section 37.

[0028] In this example, the burner end member 31 is shown as a hollow, frustoconical member, but the configuration is not limited to this. The burner end member 31 may be made of, for example, a flat plate-shaped member.

[0029] The burner casing 32 is connected to the burner end member 31 and constitutes the outer wall of the main burner 30. The burner casing 32 is made up of, for example, a cylindrical member with openings at both ends. Both ends of the burner casing 32 have, for example, annular flanges 32a and 32b that protrude outward. The central axis of the burner end member 31 is positioned to be coaxial with the central axis of the burner casing 32.

[0030] Furthermore, the burner casing 32 is equipped with an exhaust gas inlet 38 for introducing exhaust gas containing excess oxygen from the primary burner 10 into the liner cooling channel 34. The burner casing 32 is also equipped with an exhaust gas outlet 39 for leading the exhaust gas containing excess oxygen introduced into the liner cooling channel 34 to the oxidizer supply unit 36. In the following, the exhaust gas containing excess oxygen will be simply referred to as exhaust gas.

[0031] As shown in Figure 1, for example, the exhaust gas inlet 38 is provided on the outlet side of the combustor liner 33, and the exhaust gas outlet 39 is provided on the burner end member 31 side. As a result, the exhaust gas introduced from the exhaust gas inlet 38 flows from the outlet end of the combustor liner 33 toward the burner end member 31 side of the combustor liner 33.

[0032] Furthermore, at least one exhaust gas inlet 38 and exhaust gas outlet 39 are provided in the circumferential direction of the burner casing 32. For example, multiple exhaust gas inlets 38 and multiple exhaust gas outlets 39 may be provided at predetermined intervals in the circumferential direction of the burner casing 32.

[0033] Here, the exhaust gas inlet 38 is connected to the exhaust section, which is the other end 11b of the combustor liner 11 in the primary burner 10, by the exhaust pipe 20. The exhaust gas outlet 39 is connected to the oxidizer supply section 36 of the main burner 30 by the oxidizer introduction pipe 21.

[0034] The combustor liner 33 is provided inside the burner casing 32 and is composed of, for example, a cylindrical member with openings at both ends. A predetermined gap is provided between the outer wall surface of the combustor liner 33 and the inner wall surface of the burner casing 32. The combustor liner 33 is arranged, for example, concentrically with the burner casing 32. Inside the combustor liner 33, hydrogen supplied from the fuel supply unit 35 and oxygen supplied from the oxidizer supply unit 36 ​​mix and burn.

[0035] Furthermore, the outlet end of the combustor liner 33 is provided with a ridge portion 33a that protrudes outward in the circumferential direction. The outer edge of the ridge portion 33a is fitted into, for example, an annular recess 32c formed on the downstream end face of the flange 32a of the burner casing 32. The upstream end face of the outer edge of the ridge portion 33a and the downstream end face of the annular recess 32c come into contact to form a sealing surface. The outer edge of the ridge portion 33a may be fixed to the downstream end face of the flange 32a, for example, with a bolt. By fitting the outer edge of the ridge portion 33a into the annular recess 32c in this way, it is possible to prevent exhaust gas introduced into the liner cooling channel 34 from flowing into the interior of the combustor liner 33 at the outlet side of the combustor liner 33.

[0036] Here, the combustor liner 33 is made of a Ni-based superalloy with a heat resistance temperature of 600-750°C. Examples of Ni-based superalloys include Hastelloy (trademark registered) and Nimonic (trademark registered). However, the materials that make up the combustor liner 33 are not limited to these; any metallic material with a heat resistance temperature of 600-750°C is acceptable.

[0037] By constructing the combustor liner 33 from the material described above, the temperature of the inner wall surface of the combustor liner 33 can be maintained at a temperature above the temperature at which water can evaporate. This allows, for example, water injected from the water injection unit 37 to adhere to the inner wall surface of the combustor liner 33, thereby improving the water evaporation efficiency.

[0038] The liner cooling channel 34 is formed by the gap between the outer wall surface of the combustor liner 33 and the inner wall surface of the burner casing 32. As described above, exhaust gas from the primary burner 10 is introduced into the liner cooling channel 34 via the exhaust gas inlet 38. This exhaust gas is in the gas phase and functions as an oxidizer in the main burner 30, as well as a cooling medium for cooling the combustor liner 33.

[0039] Here, an example is shown in which the flow of exhaust gas in the liner cooling channel 34 is parallel to and in the opposite direction to the flow of combustion gas along the inner wall surface of the combustor liner 33. In this case, the exhaust gas in the liner cooling channel 34 performs counterflow heat exchange with the combustion gas flowing along the inner wall surface of the combustor liner 33 via the combustor liner 33. Such counterflow heat exchange yields a higher heat exchange rate compared to parallel flow heat exchange, where the exhaust gas and combustion gas flow in parallel and in the same direction.

[0040] Furthermore, the exhaust gas introduced from the exhaust gas inlet 38 flows from the outlet end of the combustor liner 33 toward the burner end member 31 end of the combustor liner 33. As a result, the entire combustor liner 33 is effectively cooled.

[0041] Here, it is preferable that the temperature of the exhaust gas introduced into the liner cooling channel 34 be set in the range of 350-450°C. The temperature of the exhaust gas can be adjusted, for example, by adjusting the amount of hydrogen supplied to the primary burner 10.

[0042] By setting the exhaust gas temperature within the above range, the combustor liner 33 can be properly cooled while maintaining the temperature of the inner wall surface of the combustor liner 33 at a temperature at which the water injected from the water injection unit 37 can evaporate. Furthermore, because the combustor liner 33 is made of the aforementioned material, the exhaust gas temperature can be set within the above range. In addition, by setting the exhaust gas temperature within the above range, the temperature of the oxidizer for the main burner, described later, can be set to a temperature above the spontaneous ignition temperature of hydrogen.

[0043] The fuel supply unit 35 supplies hydrogen into the combustor liner 33. The fuel supply unit 35 is composed of, for example, a cylindrical member. The hydrogen is injected into the combustor liner 33 from the opening of the fuel supply unit 35 on the combustor liner 33 side. The fuel supply unit 35 is located in the center of the burner end member 31. In other words, the fuel supply unit 35 is positioned such that its central axis is coaxial with the central axis of the burner end member 31. As a result, the fuel supply unit 35 is positioned such that its central axis is coaxial with the central axis of the combustor liner 33.

[0044] The oxidizer supply unit 36 ​​supplies exhaust gas that has passed through the liner cooling channel 34 as an oxidizer into the combustor liner 33. The exhaust gas is heated in the liner cooling channel 34 by heat received from the combustion gas inside the combustor liner 33 via the combustor liner 33. In the following, the exhaust gas supplied to the oxidizer supply unit 36 ​​by the oxidizer introduction pipe 21 will be referred to as the main burner oxidizer.

[0045] The oxidizer supply unit 36 ​​is composed of, for example, an annular passage between the fuel supply unit 35 and a cylindrical member 40 provided on the outer circumference of the fuel supply unit 35. The cylindrical member 40 is arranged on the burner end member 31 concentrically with the cylindrical member constituting the fuel supply unit 35. The oxidizer for the main burner is injected into the combustor liner 33 from the annular opening of the oxidizer supply unit 36 ​​on the combustor liner 33 side.

[0046] Here, the oxidizer for the main burner contains oxygen necessary for the complete combustion of hydrogen supplied from the fuel supply unit 35. Furthermore, the mass ratio of hydrogen to oxygen burned in the main burner 30 (fuel-air ratio) is set to the theoretical (stoichiometric) fuel-air ratio. In other words, in the combustion in the main burner 30, the mass of hydrogen and the mass of oxygen are set to have an equivalent ratio of 1.

[0047] As described above, the main burner 30 shows an example in which a diffusion combustion method is employed in which hydrogen and the oxidizer for the main burner are supplied separately to the combustor liner 33 for combustion.

[0048] As mentioned above, the heat absorbed in the liner cooling channel 34 causes the temperature of the oxidizer for the main burner supplied into the combustor liner 33 to reach a temperature above the spontaneous ignition temperature of hydrogen (for example, 400-550°C). Therefore, combustion of hydrogen and the oxidizer for the main burner occurs in the main burner 30 without the need for forced ignition by an ignition device. As a result, an ignition device is not required in the main burner 30.

[0049] The water injection unit 37 injects (sprays) water into the combustor liner 33, which functions as diluent water to bring the temperature of the steam discharged from the main burner 30 to a predetermined temperature. Here, the predetermined temperature is the temperature required by the steam generated in the steam generator 1, for example, by a steam turbine or steam utilization equipment. In addition to functioning as diluent water to adjust the temperature of the combustion gas to the predetermined temperature, the water injected from the water injection unit 37 also functions as water for generating steam.

[0050] In the following, the steam generated by the combustion of hydrogen and oxygen, and the steam generated by the vaporization of water injected from the water injection unit 37, will simply be referred to as steam.

[0051] The water injection section 37 is provided on the outer circumference of the oxidizer supply section 36 on the burner end member 31. As shown in Figure 2, for example, multiple water injection sections 37 are provided circumferentially on the outer edge of the burner end member 31. Here, an example is shown in which eight water injection sections 37 are provided at predetermined intervals in the circumferential direction. Note that the number of water injection sections 37 is not limited to this and can be set as appropriate.

[0052] Specifically, as shown in Figure 1, the water injection unit 37 is positioned at a predetermined angle θ towards the central axis of the burner end member 31 and the combustor liner 33. The angle θ is the angle between the central axis L1 of the water injection unit 37 and the straight line L2, which is parallel to the central axis of the burner end member 31, centered at the intersection of the central axis L1 of the water injection unit 37 and the straight line L2, as shown in Figure 1. Note that the angle θ refers to the smaller of the angles made between the central axis L1 and the straight line L2.

[0053] Here, since the burner end member 31 is made of a frustoconical member, for example, the side wall of the frustoconical member is inclined outward at an angle θ with respect to the central axis direction of the burner end member 31. Furthermore, since the water injection section 37 is provided perpendicular to the side wall of the frustoconical member, the burner end member 31 is positioned at an angle θ toward the central axis.

[0054] Furthermore, if the burner end member 31 is made of, for example, a flat plate-shaped member, the water injection unit 37 is provided on the burner end member 31 at a predetermined angle θ towards the central axis side of the burner end member 31 or the combustor liner 33.

[0055] The water injection unit 37 is composed of, for example, an atomizing nozzle that sprays water and atomizes it. The water sprayed from the water injection unit 37 is atomized to form a spray consisting of numerous tiny droplets. Hereafter, the water sprayed from the water injection unit 37 and atomized will be referred to as spray water Wa.

[0056] From the viewpoint of promoting the evaporation of the sprayed water Wa injected from the water injection unit 37 within the combustor liner 33, it is preferable that the particle size of the fine droplets in the sprayed water Wa be as small as possible. Furthermore, the sprayed water Wa spreads out in a cone shape at a predetermined injection angle, starting from the injection holes of the water injection unit 37. Examples of the water injection unit 37 include, for example, a pressure injection nozzle. However, the water injection unit 37 is not limited to this; any configuration that sprays water and atomizes it is applicable.

[0057] By providing the water injection unit 37 on the outer edge of the burner end member 31, the spray water Wa is injected from the outer circumference of the flame Fm formed in the combustor liner 33, as shown in Figure 1. From the viewpoint of stable combustion, it is preferable that the spray water Wa is injected downstream of the flame base, which is the upstream end of the flame Fm. By injecting spray water Wa onto the flame Fm in this way, the flame temperature decreases, and the temperature of the combustion gas, which is steam, also decreases. Then, steam is generated when the spray water Wa vaporizes.

[0058] Next, we will describe the various supply systems to the steam generator 1: the hydrogen supply system 50, the oxygen supply system 60, and the water supply system 70.

[0059] As shown in Figure 1, the hydrogen supply system 50 supplies hydrogen, which is the fuel, to the primary burner 10 and the main burner 30. The hydrogen supply system 50 includes a fuel supply source 51, a fuel pipe 52 for the main burner, and a fuel supply pipe 53 for the primary burner.

[0060] The main burner fuel pipe 52 supplies fuel to the fuel supply unit 35 of the main burner 30. The main burner fuel pipe 52 connects the fuel supply source 51 and the fuel supply unit 35. The main burner fuel pipe 52 includes, for example, a pressure regulating valve 54 that adjusts the fuel pressure from the fuel supply source 51 and a flow rate regulating valve 55 that adjusts the fuel flow rate.

[0061] The primary burner fuel supply pipe 53 supplies fuel to the fuel supply section 12 of the primary burner 10. One end of the primary burner fuel supply pipe 53 is connected to the main burner fuel pipe 52 between the pressure regulating valve 54 and the flow control valve 55. The other end of the primary burner fuel supply pipe 53 is connected to the fuel supply section 12. The primary burner fuel supply pipe 53 is equipped with a flow control valve 56 for adjusting the fuel flow rate.

[0062] The oxygen supply system 60 supplies oxygen, which is an oxidizing agent, to the primary burner 10 and the main burner 30. The oxygen supply system 60 comprises an oxygen supply source 61, an oxidizing agent supply pipe 62 for the primary burner, a combustor liner 11, an exhaust pipe 20, a liner cooling passage 34, and an oxidizing agent introduction pipe 21.

[0063] The primary burner oxidizer supply pipe 62 supplies oxidizer to the oxidizer supply unit 13 of the primary burner 10. The primary burner oxidizer supply pipe 62 connects the oxygen supply source 61 and the oxidizer supply unit 13. The primary burner oxidizer supply pipe 62 includes, for example, a pressure regulating valve 63 for adjusting the pressure of the oxidizer from the oxygen supply source 61 and a flow rate regulating valve 64 for adjusting the flow rate of the oxidizer.

[0064] The combustor liner 11 guides the exhaust gas, which contains the combustion of hydrogen and oxygen, along with excess oxygen, to the exhaust pipe 20.

[0065] As mentioned above, the exhaust pipe 20 introduces the exhaust gas from the combustor liner 11 of the primary burner 10 into the liner cooling passage 34 of the main burner 30.

[0066] As described above, the liner cooling channel 34 allows the exhaust gas to function as a cooling medium for the combustor liner 33, while simultaneously guiding the exhaust gas to the oxidizer introduction pipe 21 as an oxidizer for the main burner.

[0067] As described above, the oxidizer introduction pipe 21 supplies the oxidizer for the main burner to the oxidizer supply unit 36.

[0068] The water supply system 70 supplies water to the main burner 30. The water supply system 70 comprises a water source 71, a main water supply pipe 72, and water supply pipes 73a and 73b for the water injection section.

[0069] The main water supply pipe 72 connects the water supply source 71 to the water supply pipes 73a and 73b for each water injection unit. One end of each water supply pipe 73a and 73b is connected to, for example, each water injection unit 37, and the other end of each water supply pipe 73a and 73b is connected to the main water supply pipe 72.

[0070] The main water supply pipe 72 includes, for example, a flow control valve 74 that adjusts the overall flow rate of the spray water Wa injected by each water injection unit 37. The water supply pipes 73a and 73b for each water injection unit include flow control valves 75a and 75b that adjust the flow rate of the spray water Wa injected by each water injection unit 37.

[0071] Here, if there are eight water injection units 37 as shown in Figure 2, the operation may be switched between water injection units 37 that inject spray water Wa and water injection units 37 that do not inject spray water Wa, based on the amount of heat generated in the combustor liner 33, in other words, the fuel flow rate supplied to the fuel supply unit 35. For example, when the fuel flow rate supplied to the fuel supply unit 35 is low, the water injection units 37 shown in Figure 2 may be operated alternately, so that spray water Wa is injected from four of the water injection units 37. Also, when the fuel flow rate supplied to the fuel supply unit 35 is high, all of the water injection units 37 may be operated.

[0072] Furthermore, as shown in Figure 2, if there are eight water injection units 37, for example, the water supply pipe 73a for the water injection units downstream of the flow control valve 75a may be branched into four systems and connected to four water injection units 37, and the water supply pipe 73b for the water injection units downstream of the flow control valve 75b may be branched into four systems and connected to the remaining four water injection units 37. In this case, opening the flow control valve 75a will cause spray water Wa to be injected from the four water injection units 37. Also, opening the flow control valve 75b will cause spray water Wa to be injected from the remaining four water injection units 37.

[0073] Next, the operation of the steam generator 1 will be explained.

[0074] First, combustion is initiated in the primary burner 10. Hydrogen is supplied to the fuel supply unit 12 from the primary burner fuel supply pipe 53, and oxygen is supplied to the oxidizer supply unit 13 from the primary burner oxidizer supply pipe 62. The mixture of hydrogen injected into the combustor liner 11 from the fuel supply unit 12 and oxygen injected into the combustor liner 11 from the oxidizer supply unit 13 is then ignited by the ignition device 15. A flame Fp is then formed, and combustion begins. Note that the hydrogen burns completely within the combustor liner 11.

[0075] The exhaust gas from the combustor liner 11 of the primary burner 10 is introduced into the liner cooling passage 34 of the main burner 30 via the exhaust pipe 20 and exhaust gas inlet 38. This exhaust gas contains water vapor and excess oxygen produced by the combustion in the primary burner 10, as described above. The temperature of the exhaust gas is also adjusted to the temperature range described above.

[0076] The exhaust gas introduced from the exhaust gas inlet 38 flows through the liner cooling channel 34 toward the exhaust gas outlet 39 while cooling the combustor liner 33. At this time, the exhaust gas flows from the outlet end of the combustor liner 33 toward the burner end member 31 end of the combustor liner 33. The exhaust gas then flows through the liner cooling channel 34 while being gradually heated by heat received from the combustion gas inside the combustor liner 33 via the combustor liner 33.

[0077] Therefore, the temperature of the exhaust gas at the exhaust gas outlet 39 is higher than the temperature of the exhaust gas at the exhaust gas inlet 38. The temperature of the exhaust gas at the exhaust gas outlet 39 is above the spontaneous ignition temperature of hydrogen.

[0078] The exhaust gas that has cooled the combustor liner 33 is then guided from the exhaust gas outlet 39 to the oxidizer introduction pipe 21 as an oxidizer for the main burner. In other words, an oxidizer for the main burner at a temperature above the spontaneous ignition temperature of hydrogen is guided to the oxidizer introduction pipe 21.

[0079] Next, combustion is started in the main burner 30. Hydrogen is supplied from the main burner fuel pipe 52 to the fuel supply unit 35, and the oxidizer for the main burner is supplied from the oxidizer introduction pipe 21 to the oxidizer supply unit 36. The hydrogen injected from the fuel supply unit 35 into the combustor liner 33 and the oxidizer for the main burner injected from the oxidizer supply unit 36 ​​into the combustor liner 33 mix within the combustor liner 33 to form a mixture. This mixture is then ignited and combusted by the heat contained in the oxidizer for the main burner.

[0080] Furthermore, as the main burner 30 starts combustion, water is supplied to each water injection unit 37 from the water supply pipes 73a and 73b. Then, spray water Wa is injected into the combustor liner 33 by each water injection unit 37. The spray water Wa is injected from the outer circumference of the flame Fm formed in the combustor liner 33. As a result, the temperature of the flame Fm decreases. The amount of water supplied to each water injection unit 37 is adjusted to a flow rate that maintains stable combustion.

[0081] Within the combustor liner 11, hydrogen and oxygen contained in the main burner oxidizer are completely combusted. Furthermore, the sprayed water Wa injected by each water injection unit 37 completely vaporizes into steam within the combustor liner 11. At this time, any water adhering to the inner wall surface of the combustor liner 11 also completely vaporizes. As a result, the entire amount of sprayed water Wa injected by each water injection unit 37 becomes steam. Additionally, by vaporizing the sprayed water Wa, the temperature of the combustion gas, i.e., the steam temperature, is adjusted to the temperature required by, for example, a steam turbine or steam utilization equipment.

[0082] The steam generated by the combustion of hydrogen and oxygen within the combustor liner 11, the steam contained in the main burner oxidizer, and the steam generated by the vaporization of the spray water Wa are discharged from the main burner 30. The steam discharged from the main burner 30 is supplied to, for example, a steam turbine or steam utilization equipment.

[0083] As described above, in the steam generator 1, the exhaust gas in the gas phase containing excess oxygen from the primary burner 10 functions as a cooling medium for the combustor liner 33 and also functions as an oxidizer for the main burner in the main burner 30.

[0084] As the exhaust gas flows through the liner cooling channel 34, the heat obtained from the combustion gas in the combustor liner 33 is not wasted to the outside but is used for combustion in the main burner 30. In other words, there is no heat loss due to the cooling medium used to cool the combustor liner 33.

[0085] Furthermore, in the main burner 30, even without an ignition device, the mixture of hydrogen and the oxidizer for the main burner can be ignited when the temperature of the oxidizer for the main burner reaches a temperature higher than the self-ignition temperature of hydrogen.

[0086] By introducing exhaust gas at a predetermined temperature into the liner cooling channel 34, the temperature of the inner wall surface of the combustor liner 33 is maintained at a temperature at which water can be evaporated. This maintenance of the inner wall surface temperature of the combustor liner 33 is achieved by constructing the combustor liner 33 from a Ni-based superalloy or the like.

[0087] By maintaining the temperature of the inner wall surface of the combustor liner 33 at a temperature that allows water to evaporate, even if spray water Wa adheres to the inner wall surface of the combustor liner 33, the attached water can be evaporated. This improves the evaporation efficiency of the spray water Wa.

[0088] By injecting spray water Wa towards the flame Fm using the water injection unit 37, the flame temperature can be lowered while completely burning hydrogen and oxygen. In addition, by vaporizing the spray water Wa, steam is generated, and the temperature of the steam is adjusted to the temperature required by the steam turbine and steam utilization equipment.

[0089] (Second Embodiment) Figure 3 is a schematic diagram showing a longitudinal cross-section of the main burner 30 in the steam generator 2 of the second embodiment. The steam generator 2 functions as a steam generator using oxygen-hydrogen combustion. In the following embodiments, the same reference numerals are used for components identical to those in the steam generator 1 of the first embodiment, and redundant explanations are omitted or simplified.

[0090] In the second embodiment of the steam generator 2, the main burner 30 is configured to have a water injection section 80 in the center of the burner end member 31, which differs from the configuration of the main burner 30 in the steam generator 1 of the first embodiment. This section will mainly describe this different configuration.

[0091] As shown in Figure 3, the water injection unit 80 is located in the center of the burner end member 31. In other words, the water injection unit 80 is positioned such that its central axis lies coaxial with the central axis of the burner end member 31. This ensures that the water injection unit 80 is positioned such that its central axis lies coaxial with the central axis of the combustor liner 33. The water injection unit 80 functions as the first water injection unit.

[0092] The water injection unit 80, like the water injection unit 37, is composed of an atomizing nozzle that sprays water and atomizes it. The water sprayed from the water injection unit 80 is atomized to form a spray consisting of numerous tiny droplets. Hereinafter, the water sprayed from the water injection unit 80 and atomized will be referred to as spray water Wb. The spray water Wb spreads out in a cone shape at a predetermined spray angle, starting from the injection hole of the water injection unit 80.

[0093] A cylindrical member 90 is provided on the outer circumference of the water injection unit 80. In other words, the water injection unit 80 is provided in a state where it is inserted into the cylindrical member 90. The cylindrical member 90 is positioned on the burner end member 31. The central axis of the cylindrical member 90 is coaxial with the central axis of the water injection unit 80.

[0094] One end of the water supply pipe 81 for the water injection unit is connected to the water injection unit 80. The other end of the water supply pipe 81 for the water injection unit is connected to the main water supply pipe 72, similar to the water supply pipes 73a and 73b for the water injection unit. The water supply pipe 81 for the water injection unit is equipped with a flow control valve 82 that adjusts the flow rate of the spray water Wb injected by the water injection unit 80.

[0095] The fuel supply unit 35 is composed of, for example, an annular passage between a cylindrical member 90 and a cylindrical member 91 provided on the outer circumference of the cylindrical member 90. The cylindrical member 91 is arranged on the burner end member 31 concentrically with the cylindrical member 90. Hydrogen supplied from the main burner fuel pipe 52 to the oxidizer supply unit 36 ​​is injected into the combustor liner 33 from an annular opening on the combustor liner 33 side of the oxidizer supply unit 36.

[0096] The oxidizer supply unit 36 ​​is composed of, for example, an annular passage between a cylindrical member 91 and a cylindrical member 92 provided on the outer circumference of the cylindrical member 91. The cylindrical member 92 is arranged on the burner end member 31 concentrically with the cylindrical member 91. The oxidizer for the main burner supplied from the oxidizer introduction pipe 21 to the oxidizer supply unit 36 ​​is injected into the combustor liner 33 from the annular opening of the oxidizer supply unit 36 ​​on the combustor liner 33 side.

[0097] As described in the first embodiment, the water injection unit 37 is provided on the outer circumference of the oxidizing agent supply unit 36 ​​on the burner end member 31. The water injection unit 37 also functions as a second water injection unit.

[0098] In the main burner 30, hydrogen injected into the combustor liner 33 from the fuel supply unit 35 and the oxidizer for the main burner injected into the combustor liner 33 from the oxidizer supply unit 36 ​​mix within the combustor liner 33 to form a mixture. This mixture is then ignited and combusted by the heat energy of the oxidizer for the main burner.

[0099] Furthermore, as the main burner 30 starts burning, water is supplied to the water injection units 37 and 80 from the water supply pipes 73a, 73b, and 81. The water injection unit 80 then sprays water Wb so as to penetrate the center of the flame Fm downstream. That is, the spray water Wb flows in a cone shape along the central axis of the flame Fm at a predetermined spray angle. The water injection unit 37 sprays water Wa onto the flame Fm from the outer circumference of the flame Fm.

[0100] In other words, as shown in Figure 3, the flame Fm is formed between the spray water Wa and spray water Wb. By spraying the spray water Wa and Wb onto the flame Fm in this way, the flame temperature decreases, as does the temperature of the combustion gas, which is steam. The amount of water supplied to the water injection unit 80 is adjusted to a flow rate within a range that maintains stable combustion.

[0101] Within the combustor liner 11, hydrogen and oxygen contained in the main burner oxidizer are completely combusted. Furthermore, the spray water Wa injected by each water injection unit 37 and the spray water Wb injected by the water injection unit 80 are completely vaporized into steam within the combustor liner 11. At this time, any water adhering to the inner wall surface of the combustor liner 11 is also completely vaporized. As a result, the entire volume of spray water Wa and Wb is converted into steam. By vaporizing the spray water Wa and Wb, the steam temperature is adjusted to the temperature required by, for example, a steam turbine or steam utilization equipment.

[0102] The steam generated by the combustion of hydrogen and oxygen within the combustor liner 11, the steam contained in the main burner oxidizer, and the steam generated by the vaporization of the spray waters Wa and Wb are discharged from the main burner 30. The steam discharged from the main burner 30 is supplied to, for example, a steam turbine or steam utilization equipment.

[0103] The steam generator 2 of the second embodiment described above can obtain the same effects as the steam generator 1 of the first embodiment. Furthermore, by injecting spray water Wb by the water injection unit 80, the temperature of the flame Fm can be further reduced while completely burning hydrogen and oxygen in the main burner 30.

[0104] (Third embodiment) Figure 4 is a schematic diagram showing a longitudinal cross-section of the main burner 30 in the steam generator 3 of the third embodiment. The steam generator 3 functions as a steam generator using oxyhydrogen combustion.

[0105] In the main burner 30 of the steam generator 3 of the third embodiment, the configuration downstream of the burner casing 32 and the combustor liner 33 differs from the configuration of the main burner 30 in the steam generator 2 of the second embodiment. This section will mainly describe this different configuration.

[0106] As shown in Figure 4, the main burner 30 is equipped with a burner casing 120 downstream of the burner casing 32. The main burner 30 is also equipped with a combustor liner 110 downstream of the combustor liner 33. Furthermore, the main burner 30 is equipped with a water injection unit 100 between the combustor liner 33 and the combustor liner 110 (between the burner casing 32 and the burner casing 120). The combustor liner 110 functions as a third combustor liner, and the water injection unit 100 functions as a third water injection unit.

[0107] The water injection unit 100, like the water injection unit 37, is composed of an atomizing nozzle that sprays water and atomizes it. The water sprayed from the water injection unit 100 is atomized to form a spray consisting of numerous tiny droplets. Hereinafter, the water sprayed from the water injection unit 100 and atomized will be referred to as spray water Wc. The spray water Wc spreads out in a cone shape at a predetermined spray angle, starting from the injection hole of the water injection unit 100.

[0108] The water injection unit 100 is arranged, for example, in an annular member 101. The annular member 101 has the same inner diameter as the combustor liner 33. The annular member 101 has a plurality of through holes 101a formed perpendicular to the central axis of the main burner 30 and toward the central axis of the main burner 30. The through holes 101a are formed at predetermined intervals along the circumferential direction. The water injection unit 100 is inserted into and fixed in the through holes 101a. The tip of the water injection unit 100 is located, for example, on the same plane as the inner wall surface of the annular member 101.

[0109] Each water injection unit 100 is provided with corresponding water supply pipes 102a and 102b. One end of the corresponding water supply pipe 102a or 102b is connected to each water injection unit 100. The other end of each water supply pipe 102a or 102b is connected to the main water supply pipe 72, similar to the water supply pipes 73a, 73b, and 81. Each water supply pipe 102a or 102b is equipped with flow control valves 103a and 103b to adjust the flow rate of the spray water Wc injected by each water injection unit 100.

[0110] The burner casing 120 is provided downstream of the burner casing 32 via an annular member 101. The burner casing 120 is composed of, for example, a cylindrical member with openings at both ends. The upstream end of the burner casing 120 has, for example, an annular flange that protrudes outward. The central axis of the burner casing 120 is positioned coaxially with the central axis of the burner casing 32.

[0111] The combustor liner 110 is provided downstream of the combustor liner 33 via an annular member 101. The combustor liner 110 is also arranged concentrically with the burner casing 120. The combustor liner 110 is composed of, for example, a cylindrical member with openings at both ends. A predetermined gap is provided between the outer wall surface of the combustor liner 110 and the inner wall surface of the burner casing 120. This gap is filled with, for example, an insulating material 111. Combustion gas (steam) that has been completely combusted in the combustor liner 33 is introduced into the combustor liner 110.

[0112] Here, the combustor liner 110 is made of a Ni-based superalloy, similar to the combustor liner 33. By constructing the combustor liner 110 from this material, the temperature of the inner wall surface of the combustor liner 110 can be maintained at a temperature above the temperature at which water can evaporate. This allows, for example, the atomized water Wc sprayed by the water injection unit 100 to adhere to the inner wall surface of the combustor liner 110, thereby improving the evaporation efficiency of the atomized water Wc.

[0113] In the main burner 30 described above, water is supplied to the water injection units 37, 80, and 100 from the water supply pipes 73a, 73b, 81, 102a, and 102b as soon as combustion begins. The spraying of the sprayed water Wa and Wb from the water injection units 37 and 80 is as described above.

[0114] Each water injection unit 100 sprays atomized water Wc onto the combustion gas (steam) discharged from the combustor liner 33. At this time, the atomized water Wc is sprayed from a direction perpendicular to the central axis of the main burner 30 toward the central axis of the main burner 30. The atomized water Wc then flows through the combustor liner 110 while mixing with the steam and vaporizing. At this time, the temperature of the steam decreases as the atomized water Wc vaporizes.

[0115] The sprayed water Wc injected by each water injection unit 100 completely vaporizes into steam within the combustor liner 110. The sprayed water Wa injected by each water injection unit 37 and the sprayed water Wb injected by water injection unit 80 also completely vaporize into steam within the combustor liner 11. As a result, the entire amounts of sprayed water Wa, Wb, and Wc are converted into steam. By vaporizing the sprayed water Wa, Wb, and Wc, the steam temperature is adjusted to the temperature required by, for example, a steam turbine or steam utilization equipment.

[0116] The steam generated by the combustion of hydrogen and oxygen within the combustor liner 11, the steam contained in the main burner oxidizer, and the steam generated by the vaporization of the spray waters Wa, Wb, and Wc are discharged from the main burner 30. The steam discharged from the main burner 30 is supplied to, for example, a steam turbine or steam utilization equipment.

[0117] The steam generator 3 of the third embodiment described above can obtain the same effects as the steam generator 2 of the second embodiment. Furthermore, by injecting spray water Wc by the water injection unit 100, the steam temperature can be adjusted to the required temperature even if steam at a temperature higher than the required temperature exists at the outlet of the combustor liner 33. In other words, by injecting spray water Wc by the water injection unit 100, steam with a uniform temperature across the outlet cross-section and meeting the required temperature can be obtained at the outlet of the combustor liner 110.

[0118] Furthermore, the configuration in the third embodiment, which includes a water injection unit 100 and a combustor liner 110, may be applied, for example, to the steam generator 1 of the first embodiment.

[0119] (Fourth embodiment) Figure 5 is a schematic diagram showing a longitudinal cross-section of the main burner 30 in the steam generator 4 of the fourth embodiment. The steam generator 4 functions as a steam generator using oxygen-hydrogen combustion.

[0120] In the main burner 30 of the steam generator 4 of the fourth embodiment, the configuration downstream of the water injection section 100 and the annular member 101 differs from the configuration of the main burner 30 in the steam generator 3 of the third embodiment. This section will mainly describe this different configuration.

[0121] As shown in Figure 5, the main burner 30 is equipped with a burner casing 130 downstream of the burner casing 32 via an annular member 101. The burner casing 130 is composed of, for example, a cylindrical member with openings at both ends. Both ends of the burner casing 130 have, for example, annular flanges that protrude outward. The inner diameter of the burner casing 130 is the same as, for example, the inner diameter of the combustor liner 33 and the annular member 101. The central axis of the burner casing 130 is positioned coaxially with the central axis of the burner casing 32. The burner casing 130 also functions as a second casing.

[0122] Here, the burner casing 130 is made of a Ni-based superalloy with a heat resistance of 600-750°C, similar to the material that makes up the combustor liner 33. By making the burner casing 130 from this material, the temperature of the inner wall surface of the burner casing 130 can be maintained at a temperature above the temperature at which water can evaporate. This allows, for example, the water sprayed by the water injection unit 100 to evaporate even if it adheres to the inner wall surface of the water injection unit 100, thereby improving the water evaporation efficiency.

[0123] Furthermore, the main burner 30 is equipped with a heat exchange passage 140 that is in contact with the outer wall surface of the burner casing 130 and covers the outer wall surface of the burner casing 130. The heat exchange passage 140 introduces exhaust gas from the combustor liner 11 of the primary burner 10 from one end and discharges the exhaust gas from the other end, introducing it into the liner cooling passage 34 via the exhaust gas inlet 38.

[0124] The heat exchange passage section 140 is composed of, for example, a tubular member 141 that is spirally wrapped around the outer wall surface of the burner casing 130. The tubular member 141 is wrapped around the outer wall surface of the burner casing 130 with a portion of it in contact with the outer wall surface of the burner casing 130. The outer circumference of the tubular member 141 is covered with an insulating member 142 to suppress heat loss to the outside. The heat exchange passage section 140 is provided in the space enclosed by the outer wall surface of the burner casing 130 and the insulating member 142.

[0125] By constructing the heat exchange passage 140 with a tubular member 141, it is possible to prevent exhaust gas flowing through the heat exchange passage 140 from flowing into the burner casing 130. Furthermore, the entire amount of exhaust gas that has exchanged heat with the combustion gas (steam) inside the burner casing 130 in the heat exchange passage 140 can be guided to the liner cooling passage 34.

[0126] An exhaust pipe 20 is connected to one end of a tubular member 141 on the outlet side of the burner casing 130. Another end of a connecting pipe 150 is connected to the other end of the tubular member 141 on the inlet side of the burner casing 130. The other end of the connecting pipe 150 is connected to an exhaust gas inlet 38.

[0127] In the main burner 30 described above, exhaust gas from the combustor liner 11 of the primary burner 10 is introduced into the tubular member 141 from one end of the tubular member 141 via the exhaust pipe 20. The temperature of the exhaust gas is adjusted to the temperature range mentioned above.

[0128] The exhaust gas introduced into the tubular member 141 flows toward the other end of the tubular member 141. At this time, any part of the burner casing 130 that is hotter than the exhaust gas is cooled by the exhaust gas via the tubular member 141. The exhaust gas is then heated by the heat received from the combustion gas via the burner casing 130.

[0129] On the other hand, areas with a temperature lower than the exhaust gas temperature are heated by heat received from the exhaust gas through the tubular member 141. As a result, the temperature of the inner wall surface of the burner casing 130 is maintained at a temperature above the temperature at which water can evaporate. In this case, the temperature of the exhaust gas decreases as heat is released. Furthermore, areas in the burner casing 130 with a temperature lower than the exhaust gas temperature can be imagined, for example, areas on the inner wall surface where a water film is formed.

[0130] Through this heat exchange, the temperature of the inner wall surface of the burner casing 130 is maintained at a temperature above the temperature at which water can evaporate. This allows, for example, the sprayed water Wc ejected by the water injection unit 100 to evaporate even if it adheres to the inner wall surface of the burner casing 130.

[0131] The exhaust gas is then introduced into the liner cooling channel 34 via the connecting pipe 150 and the exhaust gas inlet 38. The subsequent actions are as described above.

[0132] The steam generator 4 of the fourth embodiment described above can achieve the same effects as the steam generator 3 of the third embodiment. Furthermore, by providing a heat exchange passage 140 through which exhaust gas from the primary burner 10 is introduced via the exhaust pipe 20, the temperature of the inner wall surface of the burner casing 130 is maintained at a temperature above the temperature at which water can be evaporated.

[0133] As the exhaust gas flows through the heat exchange passage 140 and the liner cooling passage 34, the heat obtained from the combustion gas in the burner casing 130 and the combustor liner 33 is not wasted to the outside but is used for combustion in the main burner 30. In other words, there is no heat loss due to the cooling medium used to cool the burner casing 130 and the combustor liner 33.

[0134] Furthermore, the configuration in the fourth embodiment, which includes the heat exchange passage 140, may be applied, for example, to the steam generator 1 of the first embodiment and the steam generator 2 of the second embodiment.

[0135] According to the embodiments described above, the combustor liner is cooled by a gas-phase cooling medium, and there is no heat loss due to the gas-phase cooling medium, making it possible to obtain high evaporation efficiency of the water injected into the combustor liner.

[0136] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0137] 1, 2, 3…Steam generator, 4…Steam generator, 10…Primary burner, 11, 33, 110…Combustor liner, 11a…One end, 11b…Other end, 12, 35…Fuel supply section, 13, 36…Oxidizer supply section, 14, 40, 90, 91, 92…Cylindrical member, 15…Ignition device, 20…Exhaust pipe, 21…Oxidizer introduction pipe, 30…Main burner, 31…Burner end member, 32, 120, 130…Burner casing, 32a, 32b…Flange, 32c…Annular recess, 33a…Protruding section, 34…Liner cooling passage, 37, 80, 100…Water injection section, 38…Exhaust gas inlet, 39…Exhaust gas outlet, 50…Hydrogen supply system, 51… Fuel supply source, 52... Fuel pipe for main burner, 53... Fuel supply pipe for primary burner, 54, 63... Pressure regulating valve, 55, 56, 64, 74, 75a, 75b, 82, 103a, 103b... Flow control valve, 60... Oxygen supply system, 61... Oxygen supply source, 62... Oxidizer supply pipe for primary burner, 70... Water supply system, 71... Water supply source, 72... Main water supply pipe, 73a, 73b, 81, 102a, 102b... Water supply pipe for water injection section, 101... Annular member, 101a... Through hole, 111, 142... Insulation member, 140... Heat exchange passage section, 141... Tubular member, 150... Connecting pipe, Fm, Fp... Flame, Wa, Wb, Wc... Spray water.

Claims

1. The first combustor, A second combustor into which exhaust gas from the first combustor is introduced Equipped with, The first combustor is, A first combustor liner that burns hydrogen and oxygen, A first fuel supply unit that supplies hydrogen into the first combustor liner, The first combustor liner contains a first oxidizer supply unit that supplies oxygen and excess oxygen necessary for the complete combustion of hydrogen supplied from the first fuel supply unit, and Equipped with, The second combustor is, The first casing and A second combustor liner for burning hydrogen and oxygen is provided within the first casing, A liner cooling channel is formed between the first casing and the second combustor liner for allowing the exhaust gas containing the excess oxygen from the first combustor liner to flow along the second combustor liner, A second fuel supply unit that supplies hydrogen into the second combustor liner, A second oxidant supply unit supplies the exhaust gas containing the excess oxygen that has passed through the liner cooling channel as an oxidant to the second combustor liner, A water injection unit that injects water into the second combustor liner and A steam generator using oxyhydrogen combustion, characterized by being equipped with the following features.

2. The steam generator using oxygen-hydrogen combustion according to claim 1, characterized in that the excess oxygen supplied from the first oxidizer supply unit is the oxygen necessary for the complete combustion of the hydrogen supplied from the second fuel supply unit.

3. The steam generator using oxygen-hydrogen combustion according to claim 1, characterized in that, during operation of the steam generator, the temperature of the inner wall surface of the second combustor liner is at or above the temperature at which water can be evaporated.

4. The second combustor is, The combustion chamber end member is further connected to the first casing and seals one end of the second combustion chamber, The second fuel supply unit is provided in the center of the combustor end member, The second oxidizer supply unit is provided on the outer circumference of the second fuel supply unit at the combustor end member, The steam generator using oxygen-hydrogen combustion according to any one of claims 1 to 3, characterized in that the water injection unit is provided on the outer circumference of the second oxidizer supply unit in the combustor end member.

5. The second combustor is, The combustion chamber end member is further connected to the first casing and seals one end of the second combustion chamber, The water injection unit comprises a first water injection unit and a second water injection unit. The first water injection unit is provided in the center of the combustor end member, The second fuel supply unit is provided on the outer circumference of the first water injection unit at the combustor end member, The second oxidizer supply unit is provided on the outer circumference of the second fuel supply unit at the combustor end member, The steam generator using oxygen-hydrogen combustion according to any one of claims 1 to 3, characterized in that the second water injection unit is provided on the outer circumference of the second oxidant supply unit in the combustor end member.

6. The second combustor is, A combustor end member connected to the first casing and sealing one end of the second combustor, A third combustor liner is located downstream of the second combustor liner. Furthermore, The water injection unit comprises a first water injection unit, a second water injection unit, and a third water injection unit. The first water injection unit is provided in the center of the combustor end member, The second fuel supply unit is provided on the outer circumference of the first water injection unit at the combustor end member, The second oxidizer supply unit is provided on the outer circumference of the second fuel supply unit at the combustor end member, The second water injection unit is provided on the outer circumference of the second oxidant supply unit in the combustor end member, The steam generator using oxygen-hydrogen combustion according to any one of claims 1 to 3, characterized in that the third water injection unit is provided between the second combustor liner and the third combustor liner.

7. The second combustor is, A combustor end member connected to the first casing and sealing one end of the second combustor, A second casing provided downstream of the first casing, A heat exchange passage is provided that contacts and covers the outer wall surface of the second casing, and introduces the exhaust gas containing the excess oxygen from the first combustor liner from one end and discharges the exhaust gas containing the excess oxygen from the other end and introduces it into the liner cooling passage. Furthermore, The water injection unit comprises a first water injection unit, a second water injection unit, and a third water injection unit. The first water injection unit is provided in the center of the combustor end member, The second fuel supply unit is provided on the outer circumference of the first water injection unit at the combustor end member, The second oxidizer supply unit is provided on the outer circumference of the second fuel supply unit at the combustor end member, The second water injection unit is provided on the outer circumference of the second oxidant supply unit in the combustor end member, The steam generator using oxygen-hydrogen combustion according to any one of claims 1 to 3, characterized in that the third water injection unit is provided between the first casing and the second casing.

8. The steam generator using oxygen-hydrogen combustion according to claim 7, characterized in that the heat exchange passage is composed of a tubular member spirally wrapped around the outer wall surface of the second casing.

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