TURBINE POWER GENERATION SYSTEM

Abstract

There is provided a turbine power generation system with a single casing configuration capable of easily executing the inhibition of an over-rotation speed. A turbine power generation system in an embodiment includes: a turbine including a turbine casing and a turbine rotor that rotates by a working medium to be introduced into the turbine casing; and a power generator including a power generator rotor connected to the turbine rotor, the power generator being caused to generate power by rotation of the power generator rotor caused by the rotation of the turbine rotor. The turbine casing of the turbine is single, and a moment of inertia of the power generator rotor is larger than a moment of inertia of the turbine rotor.

Claims

1. A turbine power generation system, comprising: a turbine including a turbine casing and a turbine rotor for rotating by a working medium to be introduced into the turbine casing; and a power generator including a power generator rotor connected to the turbine rotor, the power generator being caused to generate power by rotation of the power generator rotor caused by the rotation of the turbine rotor, wherein the turbine casing of the turbine includes is single, and a moment of inertia of the power generator rotor is larger than a moment of inertia of the turbine rotor.

2. The turbine power generation system according to claim 1, wherein a power generation capacity is 150 MW or more.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a view schematically illustrating an entire configuration of a turbine power generation system according to an embodiment.

[0029] FIG. 2 is a view schematically illustrating an entire configuration of a turbine power generation system according to a modified example of the embodiment.

[0030] FIG. 3 is a view schematically illustrating an entire configuration of a turbine power generation system according to a modified example of the embodiment.

[0031] FIG. 4 is a view schematically illustrating a turbine power generation system with a multiple casing configuration according to a prior art.

[0032] FIG. 5 is a view schematically illustrating a turbine power generation system with a multiple casing configuration according to the prior art.

[0033] FIG. 6 is a view schematically illustrating a turbine power generation system with a single casing configuration according to the prior art.

DETAILED DESCRIPTION

[0034] A turbine power generation system in an embodiment includes: a turbine including a turbine casing and a turbine rotor that rotates by a working medium to be introduced into the turbine casing; and a power generator including a power generator rotor connected to the turbine rotor, the power generator being caused to generate power by rotation of the power generator rotor caused by the rotation of the turbine rotor. The turbine includes the turbine casing that is single, and a moment of inertia of the power generator rotor is larger than a moment of inertia of the turbine rotor.

[A] Configuration

[0035] The turbine power generation system according to the embodiment is explained while using FIG. 1.

[0036] As illustrated in FIG. 1, a turbine power generation system 1 in this embodiment has a single casing configuration similarly to the above-described turbine power generation system 1c (see FIG. 6).

[0037] In the turbine power generation system 1, a turbine 10 is a single-flow type, and houses a turbine rotor 112 in a turbine casing 111.

[0038] A power generator 20 includes a power generator rotor 202 connected to the turbine rotor 112 via a coupling 30 and is caused to generate power by rotation of the power generator rotor 202 caused by rotation of the turbine rotor 112.

[0039] The turbine power generation system 1 in this embodiment has the single turbine casing 111 and has a power generation capacity of 150 MW or more. Further, the turbine power generation system 1 is configured to make the moment of inertia of the power generator rotor 202 larger than that of the turbine rotor 112. For example, the outside diameter of the power generator rotor 202 is larger than that of the turbine rotor 112.

[B] Operation—Effect

[0040] As in this embodiment, in the turbine power generation system 1 having the single turbine casing 111 and a large power generation capacity, in order to inhibit the turbine rotor 112 from rotating at an over-rotation speed exceeding its rated rotation speed when load rejection is to be performed, increasing the moment of inertia of the turbine rotor 112 and the moment of inertia of the power generator rotor 202 is desired.

[0041] The following equation (i) represents the relationship between an annular area S of an annular turbine flow path through which the working medium passes inside the turbine 10, an average diameter PCD of the turbine flow path, and a height H of turbine blades (rotor blade.Math.stator blade).

S=π×PCD×H   Equation (i)

[0042] The average diameter PCD of the turbine flow path is represented by a diameter D of the turbine rotor 112 (path inside diameter) and the height H of the turbine blades (rotor blade.Math.stator blade) as represented in the following equation (ii).

PCD=D+H   Equation (ii)

[0043] In order to increase the moment of inertia of the turbine rotor 112, the diameter D of the turbine rotor 112 needs to be increased. However, as is clear from the equation (i) and the equation (ii), in the case of the same annular area S, as the diameter D of the turbine rotor 112 is increased, the height H of the turbine blades (rotor blade.Math.stator blade) is reduced. The performance of the turbine 10 decreases as the height H of the turbine blades (rotor blade.Math.stator blade) is reduced. Therefore, it is difficult to arbitrarily increase the diameter D of the turbine rotor 112 in order to maintain the performance of the turbine 10, and it is not easy to increase the moment of inertia of the turbine rotor 112.

[0044] Further, increasing the diameter D of the turbine rotor for the purpose of increasing the moment of inertia of the turbine rotor 112 is not easy in terms of strength design because the centrifugal force of the rotor blades increases.

[0045] However, in this embodiment, as described above, the moment of inertia of the power generator rotor 202 is larger than that of the turbine rotor 112. As a result, the turbine power generation system 1 having the single turbine casing 111 and a large power generation capacity in this embodiment is capable of maintaining the performance of the turbine 10, and at the same time, effectively inhibiting the turbine rotor 112 from rotating at an over-rotation speed when load rejection is to be performed.

[0046] Conventionally, the turbine power generation system 1c with a single casing configuration had a difficulty in achieving a power generation output of 150 MW or more, and was configured to have a multiple casing, to thereby achieve the power generation output of 15 MW or more. However, as described above, this embodiment can achieve both the performance of the turbine 10 and the inhibition of the turbine rotor 112 from overspeeding when load rejection is to be performed, and thus it is possible to achieve the power generation capacity of 150 MW or more in the turbine power generation system 1 with a single casing configuration.

[C] Modified Example

[0047] There are explained turbine power generation systems according to modified examples in the embodiment while using FIG. 2 and FIG. 3.

[0048] As illustrated in FIG. 2, in the turbine power generation system 1 in this embodiment, the turbine 10 may be a double-flow type other than the single-flow type (see FIG. 1).

[0049] Further, as illustrated in FIG. 3, the turbine power generation system 1 in this embodiment may include a pressure booster part 40 such as a compressor or a pump. The pressure booster part 40 is installed, for example, on the other end side of the turbine rotor 112 located opposite to one end side located on the power generator rotor 202 side, and a rotary shaft (whose illustration is omitted) of the pressure booster part 40 is connected to the turbine rotor 112.

[0050] Even in the case of the configurations illustrated in FIG. 2 and FIG. 3, the same effect as that of the above-described embodiment can be exhibited by making the moment of inertia of the power generator rotor 202 larger than that of the turbine rotor 112.

<Others>

[0051] While certain embodiments of the present invention have been described above, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.

REFERENCE SIGNS LIST

[0052] 1: turbine power generation system, 1a: turbine power generation system, 1b: turbine power generation system, 1c: turbine power generation system, 10: turbine, 11a:

[0053] first turbine part, 11b: second turbine part, 11c: third turbine part, 20: power generator, 30: coupling, 40: pressure booster part, 111: turbine casing, 111a: first turbine casing, 111b: second turbine casing, 111c: third turbine casing, 112: turbine rotor, 112a: first turbine rotor, 112b: second turbine rotor, 112c: third turbine rotor, 201: power generator casing, 202: power generator rotor,