Turbine for thermoelectric power generation and thermoelectric power generation system equipped with the turbine for thermoelectric power generation

Abstract

Provided is a cryogenic power generation turbine that is disposed in a heat transfer medium circulation line configured so as to circulate a heat transfer medium for heating liquefied gas. The cryogenic power generation turbine comprises: a rotor shaft; an inner casing; an outer casing; a generator that includes a generator rotor and a generator stator; a first stage rotor blade; a first stage stator blade; a second stage stator blade; a second stage rotor blade; and a heat transfer medium flowpath that is defined between the outer peripheral surface of the inner casing and the inner peripheral surface of the outer casing and extends along the axial direction of the rotor shaft from upstream of the first stage stator blade to downstream of the second stage rotor blade.

Description

Technical Field

[0001] The present disclosure relates to a cold thermal power generation system including a turbine for cold thermal power generation provided in a heat medium circulation line configured to circulate a heat medium for heating liquefied gas, and the turbine for cold thermal power generation.

Background Art

[0002] Liquefied gas (for example, liquefied natural gas) is liquefied for the purpose of transportation and storage, and when supplied to a supply destination such as city gas or thermal power generation, it is heated and vaporized with a heat medium such as seawater. There is cold thermal power generation that recovers cold thermal energy as electric power instead of discarding it to seawater when vaporizing liquefied gas.

[0003] As a cold thermal power generation cycle using liquefied natural gas, ORC (Organic Rankine Cycle) is known. In ORC, a low-temperature working fluid having a boiling point lower than that of water and circulating in a closed loop is cooled and condensed by liquefied natural gas in a condenser (condenser), then pressurized by a pump, and heated and evaporated using seawater or the like as a heat source in an evaporator, and this vapor is introduced into a turbine for cold thermal power generation to obtain power. This is a cycle process.

[0004] A turbine for cold thermal power generation that recovers cold thermal energy and generates electricity, such as ORC, generally has a structure in which the turbine is arranged only at one end of the shaft of the generator. However, in this structure, it was necessary to provide a counterweight at the other shaft end.

[0005] In Patent Document 1, in order to miniaturize a cold thermal power generation device, a turbine for cold thermal power generation in which two radial turbines and a generator are coaxially arranged in the same casing is disclosed. In this turbine for cold thermal power generation, a generator is arranged at the central portion of the shaft, and radial turbines are arranged at both ends of the shaft.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Since the generator rotates at a high speed, cooling is required. As the cooling method, the water cooling method is generally used. In the technology disclosed in Patent Document 1, in order to cool the generator, it is necessary to secure a cooling source (cooling water), and it is necessary to provide a cooling mechanism such as equipment and a cooling flow path required for cooling. For this reason, there is a concern that the thermoelectric power generation device may be enlarged.

[0008] In view of the above circumstances, an object of at least one embodiment of the present disclosure is to provide a turbine for thermoelectric power generation that can suppress the enlargement of the device by eliminating or miniaturizing the cooling mechanism.

Means for Solving the Problems

[0009] To achieve the above object, a turbine for thermoelectric power generation according to one aspect is a turbine for thermoelectric power generation provided in a heat medium circulation line configured to circulate a heat medium for heating liquefied gas, a rotor shaft, an inner casing that rotatably houses the rotor shaft, an outer casing disposed on the outer peripheral side of the inner casing, a generator including a generator rotor formed on the outer peripheral surface of the rotor shaft and a generator stator supported on the inner peripheral surface of the inner casing, a first-stage moving blade provided on one side of the rotor shaft with respect to the generator rotor, a first-stage stationary blade supported on the inner peripheral surface of the outer casing or the outer peripheral surface of the inner casing on the one side with respect to the first-stage moving blade, A second-stage stationary vane supported by the inner peripheral surface of the outer casing or the outer peripheral surface of the inner casing on the other side of the rotor shaft with respect to the generator rotor; A second-stage moving vane provided on the other side with respect to the second-stage stationary vane; A heat medium flow path defined between the outer peripheral surface of the inner casing and the inner peripheral surface of the outer casing, the heat medium flow path extending along the axial direction of the rotor shaft from upstream of the first-stage stationary vane to downstream of the second-stage moving vane.

Advantages of the Invention

[0010] According to the turbine for combined heat and power generation of the present disclosure, it is possible to provide a turbine for combined heat and power generation that can suppress the enlargement of the device by eliminating the need for a cooling mechanism or reducing its scale.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0012] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present disclosure, but are merely illustrative examples. For example, expressions indicating relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only precisely represent such arrangements, but also represent states with tolerances or relative displacements with angles or distances that achieve the same function. For example, expressions indicating that things are in an equal state such as "identical", "equal", and "homogeneous" not only precisely represent an equal state, but also represent states with tolerances or differences that achieve the same function. For example, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent shapes such as a rectangular shape or a cylindrical shape in a geometrically precise sense, but also represent shapes including uneven portions, chamfered portions, etc. within a range where the same effect is obtained. On the other hand, expressions such as "comprising", "including", or "having" a component are not exclusive expressions that exclude the existence of other components. Note that the same reference numerals may be given to similar configurations and the description may be omitted.

[0013] (Thermoelectric power generation system) FIG. 1 is a schematic configuration diagram schematically showing the overall configuration of a thermoelectric power generation system including a thermoelectric power generation turbine according to an embodiment of the present disclosure.

[0014] The thermoelectric power generation system 100 according to an embodiment of the present embodiment is a thermoelectric power generation system 100 for recovering the cold energy of liquefied gas as electric power through a heat medium for heating the liquefied gas. The thermoelectric power generation system 100 is not particularly limited, but is installed, for example, in the floating structure 10A on water or the onshore liquefied gas base 10B described below.

[0015] The floating structure 10A on water is a structure that can float on water. The floating structure 10A on water has a propulsion device configured to drive a propeller or other propulsion means, and includes a ship that can move forward by driving the propulsion device and a floating body without a propulsion device. In the floating structure 10A on water, liquefied gas in a liquid state is stored, and the liquefied gas in a liquid state is heated by seawater or the like and vaporized, and then flows into an engine (not shown) to obtain propulsion force. When vaporizing the liquefied gas, instead of discarding the cold energy to seawater by the cold power generation system 100, it is recovered as electric power by the cold power generation turbine 1 described later.

[0016] At the onshore LNG (liquefied gas) base 10B, the liquefied gas transported by the LNG carrier is received and stored. And when supplying to the supply destinations of liquefied gas such as city gas and thermal power plants, the liquefied gas is heated by seawater or the like and returned to gas. When vaporizing the liquefied gas, instead of discarding the cold energy to seawater by the cold power generation system 100, it is recovered as electric power by the cold power generation turbine 1 described later.

[0017] Here, in the following embodiments, the case where the cold power generation system 100 of the present disclosure is installed in the ship 10 that uses liquefied gas as fuel among the above-described floating structures 10A on water will be described as an example.

[0018] As shown in FIG. 1, the cold power generation system 100 includes a cold power generation turbine 1, a liquefied gas supply line 2, a condenser 3, a heating fluid supply line 4, a cold fluid pump 5, an evaporator 7, and a heat medium circulation line 9. The cold power generation turbine 1, the condenser 3, the cold fluid pump 5, and the evaporator 7 are respectively connected by the heat medium circulation line 9. Further, the liquefied gas supply line 2 is connected to the condenser 3. Further, the heating fluid supply line 4 is connected to the evaporator 7. Each of the heat medium circulation line 9, the liquefied gas supply line 2, and the heating fluid supply line 4 includes a flow path through which a fluid such as a pipeline flows. And the cold power generation system 100 is configured to be driven by the heat medium circulating in the heat medium circulation line 9 while changing its state between liquid and gas.

[0019] The heat medium circulation line 9 is configured to circulate a heat medium having a freezing point lower than that of water. Hereinafter, liquefied natural gas (LNG) will be taken as a specific example of the liquefied gas, and propane will be taken as a specific example of the heat medium flowing through the heat medium circulation line 9 for explanation. However, the present disclosure is also applicable to liquefied gases other than liquefied natural gas (such as liquefied hydrogen), and is also applicable when a heat medium other than propane, for example, R1234yf or R1234ze, is used as the heat medium flowing through the heat medium circulation line 9.

[0020] The condenser 3 is configured to condense the working fluid by heat exchange between the heat medium and the liquefied gas. Inside the condenser 3, there are provided a heating-side pipeline 31 connected to the heat medium circulation line 9 and through which the heat medium circulating in the heat medium circulation line 9 flows in, and a heated-side pipeline 32 connected to the liquefied gas supply line 2 and through which the liquefied gas flowing in the liquefied gas supply line 2 flows in. And it is configured such that the heat medium flowing through the heating-side pipeline 31 exchanges heat with the liquefied gas flowing through the heated-side pipeline 32. In the condenser 3, the heat medium is cooled and condensed by heat exchange, and the liquefied gas is heated.

[0021] The liquefied gas supply line 2 upstream of the condenser 3 is connected to the liquefied gas pump 22, and the further upstream side of the liquefied gas pump 22 is connected to the liquefied gas storage device 21. By driving the liquefied gas pump 22, the liquid liquefied gas stored in the liquefied gas storage device 21 is sent to the liquefied gas supply line 2, flows through the liquefied gas supply line 2 from the upstream side to the downstream side, and is supplied to the condenser 3. Then, the liquefied gas vaporized by heat exchange inside the condenser 3 flows through the heated-side pipeline 32, then flows through the liquefied gas supply line 2 again, and is supplied as fuel to an engine (not shown) of the ship 10 installed downstream of the condenser 3.

[0022] The heat pump 5 for cooling and heating is configured to boost the pressure of the heat medium supplied from the condenser 3. When the heat pump 5 for cooling and heating connected to the heat medium circulation line 9 is driven, the heat medium circulates through the heat medium circulation line 9. The heat medium flows from the condenser 3 to the heat pump 5 for cooling and heating, from the heat pump 5 for cooling and heating to the evaporator 7, from the evaporator 7 to the cooling and heating power generation turbine 1, and from the cooling and heating power generation turbine 1 to the condenser 3.

[0023] The heat pump 5 for cooling and heating only needs to be able to boost the pressure of the heat medium, and its type is not particularly limited. For example, the type can be appropriately selected according to the embodiment, such as a turbo pump (centrifugal pump, mixed-flow pump, axial-flow pump, etc.), a positive-displacement pump (reciprocating pump, rotary pump), a special pump (submersible motor pump), etc.

[0024] The evaporator 7 is configured to evaporate the heat medium by heat exchange between the heat medium boosted in pressure by the heat pump 5 for cooling and heating and the heating fluid introduced from outside the cooling and heating power generation system 100. Inside the evaporator 7, the heat medium boosted in pressure by the heat pump 5 for cooling and heating flows in, and there are provided a heat medium heated side pipe line 71 connected to the heat medium circulation line 9 and a heat medium heating side pipe line 72 connected to the heating fluid supply line 4 and into which the heating fluid introduced from outside the cooling and heating power generation system 100 flows. And it is configured such that the heat medium flowing through the heat medium heated side pipe line 71 and the heating fluid flowing through the heating side pipe line 72 perform heat exchange. In the evaporator 7, the heat medium is heated and evaporated by heat exchange, and the heating fluid is cooled.

[0025] The heating fluid supply line 4 upstream of the evaporator 7 is connected to the heating fluid pump 42. Further upstream of the heating fluid pump 42 in the heating fluid supply line 4 is connected to the supply source of the heating fluid so that the heating fluid is introduced from outside the cooling and heating power generation system 100. By driving the pump 42 for the heating fluid, the heating fluid is sent from the supply source of the heating fluid to the heating fluid supply line 4, flows from the upstream side to the downstream side of the heating fluid supply line 4, and is supplied to the evaporator 7. Then, the heating fluid cooled by the heat exchange inside the evaporator 7 flows through the heat medium heating side pipe line 72, then flows through the heating fluid supply line 4 again, and is discharged to the outside of the thermoelectric power generation system 100.

[0026] The above-mentioned "heating fluid" may be any fluid that heats the heat medium circulating in the heat medium circulation line 9 as a heat medium in the evaporator 7, and may be steam, hot water, seawater, engine cooling water, or water at room temperature. When the thermoelectric power generation system 100 is mounted on the ship 10, the heating fluid can preferably use water that is easily available on the ship 10 (for example, seawater outside the ship or engine cooling water that cools the engine of the ship 10).

[0027] The thermoelectric power generation turbine 1 is configured to be driven by the gaseous heat medium generated in the evaporator 7. In addition, the thermoelectric power generation turbine 1 has a generator 8. Then, when the rotor shaft 11 of the thermoelectric power generation turbine 1 described later rotates by the gaseous heat medium generated in the evaporator 7, the generator 8 is configured to be driven. The gaseous heat medium that has driven the thermoelectric power generation turbine 1 flows through the heat medium circulation line 9 toward the condenser 3 installed downstream of the thermoelectric power generation turbine 1.

[0028] (Thermoelectric power generation turbine) FIG. 2 is a schematic cross-sectional view of the thermoelectric power generation turbine according to an embodiment of the present disclosure, and is a view when the thermoelectric power generation turbine is placed horizontally. FIG. 3 is a cross-sectional view taken along line A-A of the thermoelectric power generation turbine shown in FIG. 2. FIG. 4 is a schematic cross-sectional view of the thermoelectric power generation turbine according to an embodiment of the present disclosure, and is a view when the thermoelectric power generation turbine is placed vertically. Hereinafter, the upstream side in the flow direction of the heat medium in the turbine 1 for thermoelectric power generation may be simply referred to as the upstream side, and the downstream side in the flow direction of the heat medium in the turbine 1 for thermoelectric power generation may be simply referred to as the downstream side. Also, the radial direction of the turbine 1 for thermoelectric power generation may be simply referred to as the radial direction, and the circumferential direction of the turbine 1 for thermoelectric power generation may be simply referred to as the circumferential direction. Also, the direction along the axis CA of the turbine 1 for thermoelectric power generation may be simply referred to as the axial direction.

[0029] The turbine 1 for thermoelectric power generation according to some embodiments includes, as shown in FIGS. 2 and 4, a rotor shaft 11, a casing 6, a generator 8, a first-stage axial-flow turbine 23, a second-stage axial-flow turbine 24, and a heat medium flow path 63. The first-stage axial-flow turbine 23 is composed of a first-stage moving blade 23B and a first-stage stationary blade 23A. The second-stage axial-flow turbine 24 is composed of a second-stage moving blade 24B and a second-stage stationary blade 24A.

[0030] In the illustrated embodiment, the rotor shaft 11 includes a shaft portion 111 having a longitudinal direction along the axis CA of the turbine 1 for thermoelectric power generation, a one-side disk portion 1ll3A that protrudes in a disk shape outward in the radial direction from the outer surface 112A on one side (upstream side) of the shaft portion 111, and the other-side disk portion 113B that protrudes in a disk shape outward in the radial direction from the outer surface 112B on the other side (downstream side) of the shaft portion 111. Also, the axis CA of the turbine 1 for thermoelectric power generation coincides with the axis of the rotor shaft 11 and the axis of the casing 6. Also, in the embodiment shown in FIG. 2, the axis CA of the rotor shaft 11 coincides with the horizontal direction, and the end on one side of the shaft portion 111 and the end on the other side of the shaft portion 111 are arranged at the same height level in the vertical direction.

[0031] On one end of the shaft portion 111 in the axial direction, a one-sided protruding portion 114A that protrudes axially outside the inner casing member 61A, which will be described later, is formed. Also, on the other end of the shaft portion 111 in the axial direction, a other-sided protruding portion 114B that protrudes axially outside the inner casing member 61A is formed. The one-sided protruding portion 114A and the other-sided protruding portion 114B are formed with a smaller diameter than other parts of the shaft portion 111. The above-described one-sided disk portion 113A is attached to the outer surface 112A of the one-sided protruding portion 114A. Similarly, the above-described other-sided disk portion 113B is attached to the outer surface 112B of the other-sided protruding portion 114B. Also, on the one side of the one-sided protruding portion 114A that is closer to the one-sided disk portion 113A, a one-sided nut 115A is screwed on, whereby the one-sided disk portion 113A is fixed to the shaft portion 111. Similarly, on the other side of the other-sided protruding portion 114B that is closer to the other-sided disk portion 113B, a other-sided nut 115B is screwed on, whereby the other-sided disk portion 113B is fixed to the shaft portion 111.

[0032] The casing 6 is composed of an inner casing 61 that rotatably houses the rotor shaft 11, and an outer casing 62 disposed on the outer peripheral side of the inner casing 61. In the illustrated embodiment, the inner casing 61 includes an inner casing member 61A, a one-sided cover member 61B disposed on one side (upstream side) in the axial direction with respect to the inner casing member 61A, and a other-sided cover member 61C disposed on the other side (downstream side) in the axial direction with respect to the inner casing member 61A.

[0033] The inner casing member 61A has a longitudinal direction along the axial direction of the thermoelectric power generation turbine 1, and is disposed between the first-stage moving blade 23B and the second-stage moving blade 24B in the axial direction of the thermoelectric power generation turbine 1. A space 610 is formed inside the inner casing member 61A, and the shaft portion 111 and a generator 8 (in the illustrated example, the generator rotor 81 and the generator stator 82), which will be described later, are housed.

[0034] The one-side cover member 61B is disposed on one side of the inner casing member 61A so as to cover one end of the shaft portion 111 including the one-side protruding portion 114A and the one-side nut 115A screwed thereto on one side in the axial direction with respect to the first-stage moving blade 23B. The other-side cover member 61C is disposed on the other side of the inner casing member 61A so as to cover the other end of the shaft portion 111 including the other-side protruding portion 114B and the other-side nut 115B screwed thereto on the other side in the axial direction with respect to the second-stage moving blade 24B.

[0035] The generator 8 is configured to include a generator rotor 81 including a permanent magnet formed on the outer peripheral surface of the rotor shaft 11 and a generator stator 82 supported by the inner peripheral surface 611 of the inner casing 61. In the illustrated embodiment, the generator rotor 8 is integrally formed on the outer peripheral surface of the rotor shaft 11, and the two have an integral structure. However, the generator rotor 8 and the rotor shaft 11 may be separately formed and configured such that the generator rotor 8 is supported on the outer peripheral surface of the rotor shaft. The generator stator 82 is supported by the inner peripheral surface 611 of the inner casing member 61A and is disposed outside the generator rotor 81 in the radial direction. Further, the generator rotor 81 and the generator stator 82 are disposed on the other side with respect to the one-side radial bearing 103A and on the one-side with respect to the other-side radial bearing 103B in the axial direction of the rotor shaft 11. That is, the generator rotor 81 and the generator stator 82 are located between the one-side radial bearing 103A and the other-side radial bearing 103B in the axial direction of the rotor shaft 11.

[0036] The first-stage moving blade 23B is provided on one side of the rotor shaft 11 with respect to the generator rotor 81. Further, the first-stage stationary blade 23A is supported by the inner peripheral surface 621 of the outer casing 62 or the outer peripheral surface 612 of the inner casing 61 on one side of the rotor shaft 11 with respect to the first-stage moving blade 23B. In the illustrated embodiment, the first-stage moving blades 23B are attached to the outer peripheral surface of the above-described one-side disk portion 113A at intervals in the circumferential direction. Further, the first-stage stationary blades 23A are supported by the inner peripheral surface 621 of the outer casing 62 and are provided at intervals in the circumferential direction on the inner peripheral surface 621. Further, in another embodiment, the first-stage stationary blades 23A may be supported by the outer peripheral surface 612 (the outer peripheral surface 612B of the one-side cover member 61B) of the inner casing 61 and may be provided at intervals in the circumferential direction on the outer peripheral surface 612 (the outer peripheral surface 612B), or may be supported by both the inner peripheral surface 621 of the outer casing 62 and the outer peripheral surface 612 (the outer peripheral surface 612B of the one-side cover member 61B) of the inner casing 61.

[0037] The second-stage stationary blades 24A are supported by the inner peripheral surface 621 of the outer casing 62 or the outer peripheral surface 612 of the inner casing 61 on the other side of the rotor shaft 11 with respect to the generator rotor 81. Further, the second-stage moving blades 24B are provided on the other side of the rotor shaft 11 with respect to the second-stage stationary blades 24A. In the illustrated embodiment, the second-stage moving blades 24B are attached to the outer peripheral surface of the above-described other-side disk portion 113B at intervals in the circumferential direction. Further, the second-stage stationary blades 24A are supported by the inner peripheral surface 621 of the outer casing 62 and are provided at intervals in the circumferential direction on the inner peripheral surface 621. Further, in another embodiment, the second-stage stationary blades 24A may be supported by the outer peripheral surface 612 (the outer peripheral surface 612A of the inner casing member 61A) of the inner casing 61 and may be provided at intervals in the circumferential direction on the outer peripheral surface 612 (the outer peripheral surface 612A), or may be supported by both the inner peripheral surface 621 of the outer casing 62 and the outer peripheral surface 612 (the outer peripheral surface 612A of the inner casing member 61A) of the inner casing 61.

[0038] The heat medium flow path 63 is defined between the outer peripheral surface 612 of the inner casing 61 and the inner peripheral surface 621 of the outer casing 62, and is configured to extend along the axial direction of the rotor shaft 11 from the upstream of the first-stage stationary blades 23A to the downstream of the second-stage moving blades 24B. In the illustrated embodiment, the heat medium flow path 63 has a longitudinal direction along the axial direction of the thermoelectric power generation turbine 1 and has an annular cross section surrounding the inner casing member 61A. And it is configured to guide the heat medium from one side to the other side between the outer casing 62 and the inner casing 61.

[0039] Also, on one side of the heat medium flow path 63, a one - side introduction path 64A for introducing the heat medium into the heat medium flow path 63 axially from one side is formed. The one - side introduction path 64A is defined by the inner surface 630A of the inlet casing 65A connected to one side of the outer casing 62 on the one - side in the axial direction rather than the one - side cover member 61B. Also, on the other side of the heat medium flow path 63, a the other - side discharge path 64B for discharging the heat medium from the heat medium flow path 63 axially to the other side is formed. The other - side discharge path 64B is defined by the inner surface 630B of the outlet casing 65B connected to the other side of the outer casing 62 on the other - side in the axial direction rather than the other - side cover member 61C.

[0040] Then, the heat medium introduced into the heat medium flow path 63 from the one - side introduction path 64A acts on the first - stage moving blade 23B after passing through the first - stage stationary blade 23A, applying a rotational force to the shaft portion 111, thereby driving the first - stage axial - flow turbine 23. The heat medium that has passed through the first - stage moving blade 23B exchanges heat with the heat generated in the generator 8 (generator rotor 81, generator stator 82) housed in the space 610 formed inside the inner casing member 61A while flowing through the heat medium flow path 63. That is, the heat generated in the generator 8 is absorbed by the heat medium flowing through the heat medium flow path 63. Thereby, the generator 8 is cooled and the heat medium flowing through the heat medium flow path 63 is heated.

[0041] The heated heat medium passes through the second-stage stationary blades 24A and then acts on the second-stage moving blades 24B to apply a rotational force to the shaft portion 111, thereby driving the second-stage axial-flow turbine 24. That is, a heat medium heated by heat exchange with the generator 8 in the heat medium flow path 63 flows into the second-stage axial-flow turbine 24, and this heated heat medium drives the second-stage axial-flow turbine 24. The heat medium that has flowed through the second-stage axial-flow turbine 24 is discharged from the heat medium flow path 63 to the other-side discharge path 64B and flows out of the external of the thermoelectric power generation turbine 1.

[0042] According to the thermoelectric power generation turbine 1 according to the present disclosure, a first-stage axial-flow turbine 23 composed of a first-stage moving blade 23B and a first-stage stationary blade 23A is provided on one side of the generator rotor 81, and a second-stage axial-flow turbine 24 composed of a second-stage moving blade 24B and a second-stage stationary blade 24A is provided on the other side. That is, axial-flow turbines are provided at both ends with the generator rotor 81 interposed therebetween. Since the axial-flow turbine does not require a large scroll (casing) like a radial turbine, it is possible to reduce the overall size of the thermoelectric power generation turbine. Further, the heat medium flows in the heat medium flow path 63 defined between the outer peripheral surface 612 of the inner casing 61 and the inner peripheral surface 621 of the outer casing 62, First-stage stationary vane 23A, first-stage moving vane 23B, second-stage stationary vane 24A, second-stage moving vane 24B in this order. That is, the heat medium that has passed through the first-stage axial-flow turbine 23 absorbs the heat of the generator 8 generated in the generator rotor 81 and the generator stator 82 while flowing through the heat medium flow path 63 and flows into the second-stage axial-flow turbine 24. With this configuration, since the generator 8 can be cooled using the heat medium, it is not necessary to additionally install a cooling mechanism such as equipment and a cooling flow path required for cooling, or it is possible to reduce the scale, and an increase in the size of the device can be suppressed. In addition, since the heat medium recovers the exhaust heat of the generator 8, the temperature of the heat medium at the inlet of the second-stage axial-flow turbine 24 rises, so that the efficiency of the second-stage axial-flow turbine 24 can be improved. That is, it is possible to achieve both cooling of the generator 8 and recovery of exhaust heat. In addition, since axial flow turbines are provided at both ends of the rotor shaft 11, the weight balance can be achieved, and thus no counterweight is required.

[0043] In the illustrated embodiment, as shown in FIGS. 2 and 4, a one-side radial bearing 103A and an other-side radial bearing 103B that rotatably support the shaft portion 111 are accommodated in a space 610 formed inside the inner casing member 61A. The one-side radial bearing 103A is disposed on one side of the generator rotor 81, and the other-side radial bearing 103B is disposed on the other side of the generator rotor 81. The one-side radial bearing 103A and the other-side radial bearing 103B are each in contact with the outer peripheral surface of the shaft portion 111 of the rotor shaft 11 at their inner circumferences and are arranged to rotatably support the shaft portion 111. Further, the one-side radial bearing 103A and the other-side radial bearing 103B are each supported by the inner peripheral surface 611 of the inner casing member 61A at their outer circumferences. In the following description, the device including the one-side radial bearing 103A and the other-side radial bearing 103B may be simply referred to as a radial bearing device 103.

[0044] In the illustrated embodiment, as shown in FIGS. 2 and 4, a thrust collar 101, a one-side thrust bearing 102A disposed to face the thrust collar 101 on one side in the axial direction with respect to the thrust collar 101, and an other-side thrust bearing 102B disposed to face the thrust collar 101 on the other side in the axial direction with respect to the thrust collar 101 are accommodated in the space 610 formed inside the inner casing member 61A. In the following description, the device including the one-side thrust bearing 102A and the other-side thrust bearing 102B may be simply referred to as a thrust bearing device 102.

[0045] In one embodiment, the one-side radial bearing 103A, the other-side radial bearing 103B, the one-side thrust bearing 102A, and the other-side thrust bearing 102B may be constituted by magnetic bearings. According to the above configuration, there is no need to use lubricating oil, and it is also unnecessary to form a device for supplying lubricating oil, so the enlargement of the device can be suppressed. In addition, since no lubricating oil is used, the mixing of oil components (lubricating oil) into the heat medium can be prevented.

[0046] In the illustrated embodiment, a thrust collar 101 and a thrust bearing device 102 are arranged on the other side of one-side radial bearing 103A and on one side of generator rotor 81. That is, generator rotor 81 and generator stator 82 are arranged between thrust bearing device 102 and the other-side radial bearing 103B along the axial direction of rotor shaft 11.

[0047] Also, in the illustrated embodiment, the blade height of the first-stage stationary blade 23A is smaller than the blade height of the second-stage stationary blade 24A, and the blade height of the first-stage moving blade 23B is smaller than the blade height of the second-stage moving blade 24B. Therefore, the inner peripheral surface 621 of the outer casing 62 that houses the first-stage axial-flow turbine 23 and the second-stage axial-flow turbine 24 is formed to widen the heat medium flow path 63 in the radial direction at the position where the second-stage axial-flow turbine 24 is arranged rather than at the position where the first-stage axial-flow turbine 23 is arranged.

[0048] In some embodiments, as shown in FIGS. 2 and 4, the turbine 1 for combined heat and power described above further includes a one-side seal portion 26A that seals the space between the rotor shaft 11 and the inner casing 61 on the other side (downstream side) of the first-stage moving blade 23B and on one side (upstream side) of the generator rotor 81.

[0049] In the illustrated embodiment, the one-side seal portion 26A seals the gap between the inner peripheral surface 611 of the inner casing member 61A and the outer peripheral surface of the shaft portion 111 of the rotor shaft 11 in the space 610 formed inside the inner casing member 61A. The one-side seal portion 26A is arranged on one side of the one-side radial bearing 103A in the axial direction of the turbine 1 for combined heat and power. Also, a ball bearing 27A is disposed between the one-side seal portion 26A and the one-side radial bearing 103A. Similarly, a ball bearing 27B is disposed between the other-side seal portion 26B and the other-side radial bearing 103B. When the turbine 1 for thermoelectric power generation stops or trips due to trouble, these ball bearings 27A and 27B support the rotor shaft 11, thereby preventing contact between the radial bearing 103 constituted by the magnetic bearing and the rotor shaft 11. Also, the one-side seal portion 26A may include a mechanical seal, or may include a labyrinth seal provided by machining unevenness on the shaft portion 111 or the inner casing member 61A.

[0050] According to such a configuration, since leakage of the heat medium that has passed through the first-stage moving blade 23B into the inner casing 61 can be suppressed, a decrease in the heat medium flowing through the heat medium flow path 63 can be suppressed as compared with the case where the seal member 26 is not provided. As a result, more heat of the generator generated in the generator rotor 81 and the generator stator 82 can be recovered as compared with the case where the seal member is not provided, so that the inlet temperature of the second-stage axial-flow turbine 24 rises and the efficiency of the second-stage axial-flow turbine 24 can be improved. Also, since the heat medium leaking into the inner casing 61 can be sealed between the high-pressure region on the first-stage axial-flow turbine 23 side and the low-pressure region on the second-stage axial-flow turbine 24 side, the pressure inside the inner casing 61 can be maintained lower as compared with the case where the seal member is not provided. Thereby, the thrust force acting on the rotor shaft 11 and the wind loss (loss) generated inside the inner casing 61 can be reduced.

[0051] Incidentally, providing the one-side seal portion 26A to suppress leakage and improve the efficiency of the second-stage axial flow turbine 24 is in a trade-off relationship with the cooling capacity of the generator 8 by the heat medium. That is, when the one-side seal portion 26A is not provided, the heat medium leaks into the inside of the inner casing 61, so that the inside of the inner casing 61 whose temperature rises due to the heat generated from the generator 8 (the heat generated by the generator rotor 81 and the generator stator 82) can be directly cooled. Therefore, the ability to cool the generator 8 is higher than when the one-side seal portion 26A is provided. According to the study by the present inventors, in the small-scale combined heat and power turbine 1 with an output of 100 kw or less, it has been clarified that the generator 8 can be sufficiently cooled by the heat medium flowing through the heat medium flow path 63 without directly cooling the inside of the inner casing 61. Therefore, in the case of the small-scale combined heat and power turbine 1, it is preferable to provide the one-side seal portion 26A to suppress leakage and improve the efficiency of the second-stage axial flow turbine 24.

[0052] In some embodiments, as shown in FIGS. 2 and 4, the above-described combined heat and power turbine 1 further includes an other-side seal portion 26B that seals between the rotor shaft 11 and the inner casing 61 on one side of the second-stage moving blade 24B and on the other side of the generator rotor 81.

[0053] In the illustrated embodiment, the other-side seal portion 26B seals the gap between the inner peripheral surface 611 of the inner casing member 61A and the outer peripheral surface of the shaft portion 111 of the rotor shaft 11 in the space 610 formed inside the inner casing member 61A. The other-side seal portion 26B is disposed on the other side of the other-side radial bearing 103B in the axial direction of the combined heat and power turbine 1. Also, the one-side seal portion 26B may include a mechanical seal or a labyrinth seal provided by performing uneven processing on the shaft portion 111 or the inner casing member 61A.

[0054] According to such a configuration, it is possible to reduce the outflow of the heat medium flowing into the inside of the inner casing 61 (inner casing member 61A) from the heat medium flow path 63 between the second-stage stator blade 24A and the second-stage rotor blade 24B, and suppress the generation of vortex flow in the heat medium passing through the second-stage axial-flow turbine 24. Thereby, the performance of the second-stage axial-flow turbine 24 can be improved.

[0055] In some embodiments, as shown in FIGS. 2 to 4, the turbine 1 for thermoelectric power generation described above further includes a bypass line 40 that communicates the inside of the inner casing 61 with a position downstream of the second-stage rotor blade 24B in the heat medium flow path 63.

[0056] In the illustrated embodiment, an inlet-side opening 40A is formed at one end of the bypass line 40 so as to open into a space 610 formed inside the inner casing member 61A on one side in the axial direction of the rotor shaft 11, on one side of the second-stage rotor blade 24B. Also, in the embodiment shown in FIG. 2, the bypass line 40 passes through an axially extending portion 61A1 on the bottom surface side of the inner casing member 61A on the lower side in the vertical direction of the turbine 1 for thermoelectric power generation. The inlet-side opening 40A is located below the lower surface of the shaft portion 111 and near the inner surface of the axially extending portion 61A1. The axially extending portion 61A1 is a side surface portion that extends along the axial direction of the inner casing member 61A and is provided such that the distance from the axis CA is constant in the radial direction, and is the bottom surface side surface on the lower side in the vertical direction where the heat medium leaking into the inside of the inner casing 61 tends to accumulate. By providing the inlet-side opening 40A near the axially extending portion 61A1, it is possible to facilitate the flow of the heat medium into the inlet-side opening 40A.

[0057] In the illustrated embodiment, the inlet-side opening 40A at the end of the bypass line 40 is connected to the radially extending introduction portion 40B of the bypass line 40. The heat medium that has leaked into the inside of the inner casing member 61A passes through the inlet-side opening 40A and flows through the radially extending introduction portion 40B of the bypass line 40. The radially extending introduction portion 40B is provided so as to penetrate the inner casing member 61A, the heat medium flow path 63, and the outer casing 62 along the radial direction and extend to the outside of the outer casing 62.

[0058] The radially extending introduction portion 40B is connected to the axially extending portion 40C, and the heat medium that has flowed through the radially extending introduction portion 40B flows into the axially extending portion 40C. The axially extending portion 40C is provided along the axial direction of the rotor shaft 11 outside the outer casing 62.

[0059] The axially extending portion 40C is connected to the radially extending discharge portion 40D, and the heat medium that has flowed through the axially extending portion 40C flows into the radially extending discharge portion 40D. The radially extending discharge portion 40D is provided so as to penetrate the outer casing 62 and the heat medium flow path 63 along the radial direction. Further, at the other end of the bypass line 40, an outlet-side opening 40E is formed so as to open into the heat medium flow path 63 on the other side (downstream side) of the second-stage moving blade 24B in the axial direction of the rotor shaft 11. The radially extending discharge portion 40D is connected to the outlet-side opening 40E, and the heat medium that has flowed through the radially extending discharge portion 40D is discharged to the outside of the bypass line 40 through the outlet-side opening 40E.

[0060] According to such a configuration, by flowing the heat medium flowing inside the inner casing 61 to the other side (downstream side) of the second-stage moving blade 24B in the heat medium flow path 63, it is possible to suppress the accumulation of the heat medium inside the inner casing 61. Further, it is possible to reduce the outflow of the heat medium flowing inside the inner casing 61 from between the second-stage stator blades 24A and the second-stage rotor blades 24B to the heat medium flow path 63, and suppress the generation of vortex flow in the heat medium passing through the second-stage axial-flow turbine 24. Thereby, the performance of the second-stage axial-flow turbine 24 can be improved.

[0061] In the illustrated embodiment, the waste heat power generation turbine 1 is provided with both the other-side seal portion 26B and the bypass line 40 described above. In the waste heat power generation turbine 1 provided with the other-side seal portion 26B but without the bypass line 40, although it is possible to reduce the outflow of the heat medium flowing into the space 610 inside the inner casing 61 from between the second-stage stator blades 24A and the second-stage rotor blades 24B to the heat medium flow path 63, due to the installation of the other-side seal portion 26B, there is no discharge destination for the heat medium that has leaked into the inside of the inner casing member 61A, and it will continue to accumulate inside the inner casing member 61A. However, by providing the bypass line 40 together with the other-side seal portion 26B, the heat medium that has leaked into the inside of the inner casing member 61A can be discharged to the outside of the inner casing member 61A, so that the accumulation of the heat medium inside the inner casing member 61A can be suppressed.

[0062] In some embodiments, the waste heat power generation turbine 1 described above further includes at least one support portion 30 extending in the heat medium flow path 63 along the radial direction of the rotor shaft 11, as shown in FIGS. 2 to 4. One end of the support portion 30 is connected to the inner peripheral surface 621 of the outer casing 62, and the other end is connected to the outer peripheral surface 612 of the inner casing 61.

[0063] The inner casing 61 is supported by the outer casing 62 by the support portion 30 described above. In the illustrated embodiment, the inner casing member 61A of the inner casing 61 is supported by the support portion 30. Further, the support portion 30 is provided in the heat medium flow path 63 and is connected to the outer peripheral surface 612 (the outer peripheral surface 612A of the inner casing member 61A) of the inner casing 61, and thus also functions as cooling fins for promoting the cooling of the generator 8.

[0064] At least one support portion 30 may be arranged along the axial direction of the thermoelectric power generation turbine 1, and at least one support portion 30 may be arranged also in the circumferential direction of the outer peripheral surface 612 of the inner casing 61. In the embodiment shown in FIG. 3, eight support portions 30 are arranged at equal intervals in the circumferential direction. Further, in the embodiments shown in FIGS. 2 and 4, one support portion 30 is arranged in the axial direction of the rotor shaft 11 in the heat medium flow path 63.

[0065] Further, in the embodiments shown in FIGS. 2 and 4, the upstream end of the support portion 30 is located on one side (upstream side) of the generator stator 82 in the axial direction of the rotor shaft 11. Also, the downstream end of the support portion 30 is located on the other side (downstream side) of the generator stator 82 in the axial direction of the rotor shaft 11. According to such a configuration, the generator stator 82 can be effectively cooled by the support portion 30.

[0066] And a part of the bypass line 40 is formed inside the support portion 30. In the illustrated embodiment, a through portion 40B1 penetrating the support portion 30 along the radial direction is formed inside the support portion 30. In one embodiment, a part of the bypass line 40 is constituted by this through portion 40B1. Also, in another embodiment, a part of the bypass line 40 is constituted by a pipe inserted into this through portion 40B1.

[0067] According to such a configuration, the bypass line 40 is provided inside the support portion 30 that supports the inner casing 61. Therefore, compared with the case where the bypass line 40 is provided outside the support portion 30 so as to extend in the heat medium flow path 63 without providing the bypass line 40 inside the support portion 30, the occurrence of new flow path losses can be suppressed.

[0068] In some embodiments, as shown in FIG. 4, the turbine 1 for thermoelectric power generation described above is installed such that one end of the rotor shaft 11 is higher in the vertical direction than the other end of the rotor shaft 11.

[0069] In the embodiment shown in FIG. 4, the axis CA of the rotor shaft 11 coincides with the vertical direction, and one end of the shaft portion 111 is arranged above the other end of the shaft portion 111 in the vertical direction.

[0070] According to such a configuration, in the vertical direction, the first-stage axial-flow turbine 23 side is higher and the second-stage axial-flow turbine side 24 is lower. Therefore, the heat medium in the heat medium flow path 63 passes through the second-stage axial-flow turbine 24 and is discharged to the outside of the turbine 1 for thermoelectric power generation. In particular, during partial load, since the flow rate of the heat medium flowing through the heat medium flow path 63 decreases, the pressure at the inlet of the second-stage stationary blade 24A (the outlet of the first-stage moving blade 23B) decreases, and accordingly the saturation temperature also decreases, so there is a risk of generating droplets (drain). However, according to the above configuration, it is possible to suppress the occurrence of liquid pooling in the heat medium flow path 63 during partial load.

[0071] Also, in the embodiment shown in FIG. 4, the bypass line 40 penetrates the inner casing member 61A from the radially extending portion 61A2 on the bottom surface side of the inner casing member 61A on the lower side in the vertical direction of the turbine 1 for thermoelectric power generation. The radially extending portion 61A2 is a side surface portion that extends along the radial direction of the inner casing member 61A and is provided so as to be perpendicular to the axis CA, and is the bottom surface side in the vertical direction where the heat medium leaking into the inside of the inner casing 61 tends to accumulate. By providing the inlet-side opening 40A in this radially extending portion 61A2, it becomes easier for the heat medium to flow into the inlet-side opening 40A.

[0072] The present disclosure is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

[0073] The content described in some of the above embodiments is understood as follows, for example.

[0074] 1) A turbine (1) for thermoelectric power generation according to one aspect is a turbine (1) for thermoelectric power generation provided in a heat medium circulation line (9) configured to circulate a heat medium for heating liquefied gas, a rotor shaft (11), an inner casing (61) rotatably accommodating the rotor shaft (11), an outer casing (62) disposed on the outer peripheral side of the inner casing (61), a generator (8) including a generator rotor (81) formed on the outer peripheral surface of the rotor shaft (11) and a generator stator (82) supported by the inner peripheral surface (611) of the inner casing (61), a first-stage moving blade (23B) provided on one side of the rotor shaft (11) with respect to the generator rotor (81), a first-stage stationary blade (23A) supported by the inner peripheral surface (621) of the outer casing (62) or the outer peripheral surface (612) of the inner casing (61) on one side with respect to the first-stage moving blade (23B), a second-stage stationary blade (24A) supported by the inner peripheral surface (621) of the outer casing (62) or the outer peripheral surface (612) of the inner casing (61) on the other side of the rotor shaft (11) with respect to the generator rotor (81), a second-stage moving blade (24B) provided on the other side with respect to the second-stage stationary blade (24A), and a heat medium flow path (63) defined between the outer peripheral surface (612) of the inner casing (61) and the inner peripheral surface (621) of the outer casing (62), the heat medium flow path (63) extending along the axial direction of the rotor shaft (11) from the upstream of the first-stage stationary blade (23A) to the downstream of the second-stage moving blade (24B).

[0075] According to the turbine for thermoelectric power generation according to the present disclosure, a first-stage axial-flow turbine composed of a first-stage moving blade and a first-stage stationary blade is provided on one side of the generator rotor, and a second-stage axial-flow turbine composed of a second-stage moving blade and a second-stage stationary blade is provided on the other side. That is, axial-flow turbines are provided at both ends with the generator rotor interposed therebetween. Since the axial-flow turbine does not require a large scroll (casing) like a radial turbine, the entire thermoelectric power generation turbine can be miniaturized. Also, the heat medium flows through the heat medium flow path defined between the outer peripheral surface of the inner casing and the inner peripheral surface of the outer casing in the order of the first-stage moving blade, the first-stage stationary blade, the second-stage moving blade, and the second-stage stationary blade. That is, the heat medium that has passed through the first-stage axial-flow turbine absorbs the heat of the generator generated in the generator rotor and the generator stator while flowing through the heat medium flow path, and flows into the second-stage axial-flow turbine. With this configuration, since the generator can be cooled using the heat medium, it is not necessary to additionally install a cooling mechanism such as equipment and a cooling flow path required for cooling, or it is possible to downsize it, and an increase in the size of the device can be suppressed. Also, since the heat medium recovers the exhaust heat of the generator, the temperature of the heat medium at the inlet of the second-stage axial-flow turbine rises, so the efficiency of the second-stage axial-flow turbine can be improved. That is, it is possible to achieve both cooling of the generator and recovery of exhaust heat. Also, since axial-flow turbines are provided at both ends of the rotor shaft, the weight balance can be achieved, and a counterweight is not required.

[0076] 2) The turbine (1) for thermoelectric power generation according to another aspect is the turbine (1) for thermoelectric power generation according to 1), and further includes a one-side seal portion (26A) that seals between the rotor shaft (11) and the inner casing (61) on the other side of the first-stage moving blade (23B) and on one side of the generator rotor (81).

[0077] According to such a configuration, since it is possible to suppress the leakage of the heat medium that has passed through the first-stage moving blades into the inside of the inner casing, it is possible to suppress a decrease in the heat medium flowing through the heat medium flow path as compared with the case where no sealing member is provided. As a result, more heat of the generator generated in the generator rotor and the generator stator can be recovered as compared with the case where no sealing member is provided, so that the inlet temperature of the second-stage axial-flow turbine rises, and the efficiency of the second-stage axial-flow turbine can be improved. Also, since it is possible to seal the heat medium leaking into the inside of the inner casing between the high-pressure region on the first-stage axial-flow turbine side and the low-pressure region on the second-stage axial-flow turbine side, the pressure inside the inner casing can be maintained lower than in the case where no sealing member is provided. As a result, the thrust force acting on the rotor shaft and the windage loss (loss) generated inside the inner casing can be reduced.

[0078] 3) Furthermore, the turbine 1 for thermoelectric power generation according to still another aspect is the turbine 1 for thermoelectric power generation described in 1) or 2), and further includes another sealing portion 26B that seals between the rotor shaft 11 and the inner casing 61 on one side of the second-stage moving blade 24B and on the other side of the generator rotor 81.

[0079] According to such a configuration, it is possible to reduce the outflow of the heat medium that has flowed into the inside of the inner casing from the heat medium flow path to the heat medium flow path between the second-stage stationary blade and the second-stage moving blade, and to suppress the generation of vortex flow in the heat medium passing through the second-stage axial-flow turbine. Thereby, the performance of the second-stage axial-flow turbine can be improved.

[0080] 4) Furthermore, the turbine for thermoelectric power generation according to still another aspect is the turbine 1 for thermoelectric power generation described in any one of 1) to 3), and further includes a bypass line 40 that communicates between the inside of the inner casing 61 and a position downstream of the second-stage moving blade 26B in the heat medium flow path 63.

[0081] According to such a configuration, by flowing the heat medium flowing inside the inner casing to the downstream side of the second-stage moving blade in the heat medium flow path, it is possible to suppress the accumulation of the heat medium inside the inner casing. In addition, it is possible to reduce the outflow of the heat medium flowing inside the inner casing from between the second-stage stationary blade and the second-stage moving blade to the heat medium flow path, and suppress the generation of vortex flow in the heat medium passing through the second-stage axial-flow turbine. Thereby, the performance of the second-stage axial-flow turbine can be improved.

[0082] 5) The turbine (1) for thermoelectric power generation according to another aspect is the turbine (1) for thermoelectric power generation described in 4), and includes at least one support portion (30) extending in the heat medium flow path (63) along the radial direction of the rotor shaft (11), one end of which is connected to the inner peripheral surface (621) of the outer casing (62) and the other end of which is connected to the outer peripheral surface (612) of the inner casing (61). A part of the bypass line (40) is formed inside the support portion (30).

[0083] According to such a configuration, the bypass line is provided inside the support portion that supports the inner casing. Therefore, compared with the case where the bypass line is provided outside the support portion so as to extend in the heat medium flow path without providing the bypass line inside the support portion, the generation of new flow path losses can be suppressed.

[0084] 6) The turbine 1 for thermoelectric power generation according to still another aspect is the turbine (1) for thermoelectric power generation described in any one of 1) to 5), and the turbine (1) for thermoelectric power generation is installed such that one end of the rotor shaft (11) is higher in the vertical direction than the other end of the rotor shaft (11).

[0085] According to such a configuration, in the vertical direction, the first-stage axial-flow turbine side is higher and the second-stage axial-flow turbine side is lower. Therefore, the heat medium in the heat medium flow path passes through the second-stage axial-flow turbine and is discharged to the outside of the thermoelectric power generation turbine. As a result, it is possible to suppress the occurrence of liquid pooling in the heat medium flow path during operation stop.

Explanation of Signs

[0086] 1 Thermoelectric power generation turbine 2 Liquefied gas supply line 3 Condenser 31 Heating side pipeline 32 Heated side pipeline 4 Heating fluid supply line 5 Heat medium pump 6 Casing 7 Evaporator 71 Heat medium heated side pipeline 72 Heat medium heating side pipeline 8 Generator 9 Heat medium circulation line 10A Floating structure on water 10 Ship 10B Liquefied gas base 11 Rotor shaft 21 Liquefied gas storage device 22 Liquefied gas pump 23 First-stage axial-flow turbine 23A First-stage stator blade 23B First-stage rotor blade 24 Second-stage axial-flow turbine 24A Second-stage stator blade 24B Second-stage rotor blade 26 Seal member 26A One-side seal part 26B The other-side seal part 27A One-side ball bearing 27B The other-side ball bearing 30 Support part 40 Bypass line 40A Inlet side opening 40B Radially extending introduction part 40B1 Through part Axial extension part of 40C Discharge part of 40D Outlet side opening of 40E Pump for heating fluid 42 Inner casing 61 Inner casing member 61A Axial extension part of 61A1 Radial extension part of 61A2 One - side cover member 61B Other - side cover member 61C Space 610 Inner peripheral surface 611 Outer peripheral surface 612 Outer peripheral surface 612B Outer casing 62 Inner peripheral surface 621 Heat medium flow path 63 One - side introduction path 64A Other - side discharge path 64B Inlet casing 65A Inner surface 630A Outlet casing 65B Inner surface 630B Generator rotor 81 Generator stator 82 Thermoelectric power generation system 100 Thrust collar 101 Thrust bearing device 102 One - side thrust bearing 102A Other - side thrust bearing 102B Radial bearing device 103 Other - side radial bearing 103A Other - side radial bearing 103B Shaft part 111 Outer surfaces of 112A and 112B One - side disk part 113A Other - side disk part 113B One - side protrusion 114A Other - side protrusion 114B One - side nut 115A Other - side nut 115B Axis CA

Claims

1. A turbine for thermoelectric power generation provided in a heat medium circulation line configured to circulate a heat medium for heating liquefied gas, a rotor shaft, an inner casing that rotatably houses the rotor shaft, an outer casing disposed on the outer peripheral side of the inner casing, a generator including a generator rotor formed on the outer peripheral surface of the rotor shaft and a generator stator supported on the inner peripheral surface of the inner casing, a first-stage moving blade provided on one side of the rotor shaft with respect to the generator rotor, a first-stage stationary blade supported on the inner peripheral surface of the outer casing or the outer peripheral surface of the inner casing on the one side with respect to the first-stage moving blade, a second-stage stationary blade supported on the inner peripheral surface of the outer casing or the outer peripheral surface of the inner casing on the other side of the rotor shaft with respect to the generator rotor, a second-stage moving blade provided on the other side with respect to the second-stage stationary blade, a heat medium flow path defined between the outer peripheral surface of the inner casing and the inner peripheral surface of the outer casing, the heat medium flow path extending along the axial direction of the rotor shaft from upstream of the first-stage stationary blade to downstream of the second-stage moving blade, wherein the heat medium flowing through the heat medium flow path acts on the second-stage moving blade after passing through the second-stage stationary blade to impart a rotational force to the shaft portion of the rotor shaft, a turbine for thermoelectric power generation.

2. The turbine for thermoelectric power generation according to claim 1, further comprising a one-side seal portion that seals between the rotor shaft and the inner casing on the other side with respect to the first-stage moving blade and on the one side with respect to the generator rotor. The turbine for thermoelectric power generation according to claim 1.

3. The turbine for thermoelectric power generation according to claim 1, further comprising an other-side seal portion that seals between the rotor shaft and the inner casing on the one side with respect to the second-stage moving blade and on the other side with respect to the generator rotor. The turbine for thermoelectric power generation according to claim 1.

4. The turbine for thermoelectric power generation according to claim 1, further comprising a bypass line that communicates the inside of the inner casing with a position downstream of the second-stage moving blade in the heat medium flow path. The turbine for thermoelectric power generation according to claim 1.

5. At least one support portion extending in the heat medium flow path along the radial direction of the rotor shaft, one end of which is connected to the inner peripheral surface of the outer casing and the other end of which is connected to the outer peripheral surface of the inner casing, and a part of the bypass line is formed inside the support portion. The turbine for thermoelectric power generation according to claim 4.

6. The turbine for thermoelectric power generation is installed such that the end on one side of the rotor shaft is higher in the vertical direction than the end on the other side of the rotor shaft. The turbine for thermoelectric power generation according to claim 1.

7. A thermoelectric power generation system including the turbine for thermoelectric power generation according to any one of claims 1 to 6.

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