TECHNICAL FIELD
The present invention relates to a steam turbine power generation facility and an operation method of the steam turbine power generation facility.
BACKGROUD OF THE INVENTION
[0002]It is necessary to start up the steam turbine generation facility while suppressing the shaft vibration caused by the thermal elongation difference between the revolving body (or rotor) and the stationary body (or casing), so that it is necessary to overcome such thermal elongation difference between the revolving body and the stationary body as early as possible to shorten the start-up time.
[0003]
The disclosure of Japanese Unexamined Patent Application Publication No. 2008-25429 is exemplified as the background art of the present technical field, in which the steam turbine includes a rotor to which movable vanes are attached; a diaphragm enclosing the outer

periphery of the rotor; a casing which incorporates the diaphragm and the rotor and whose upper and lower half sections are integrally clamped with each other at the flange section; a displacement detector which measures the thermal elongation difference in the axial direction between the casing and the rotor; a heating/cooling apparatus which is attached to the flange section and heats/cools the flange section; and a control unit which heats/cools the flange section with the heating/cooling apparatus until the measured value of the displacement detector corresponds to the set value during non-regular operation (refer to the description of abstract).
SUMMARY OF THE INVENTION [0005]
In Japanese Unexamined Patent Application Publication No. 2008-25429, such a steam turbine is disclosed as overcoming the thermal elongation difference between the revolving body and the stationary body by heating/cooling the flange section in order to shorten the start-up time. However, in Japanese Unexamined Patent Application Publication No. 2008-25429, there is no disclosure on the supply source of the medium (steam) to heat/cool the flange section (casing flange). In order for the heating/cooling medium (steam) to be fed from the

supply source to the flange section (casing flange), the enhancement of energy is necessary. When heating/cooling the flange section (casing flange), due to such enhanced energy, t the efficiency of the steam turbine power generation facility in which the steam turbine is installed may be deteriorated. [0006]
Thus, the present invention is to provide a steam turbine power generation facility and an operation method of the steam turbine power generation facility which not only overcome the thermal elongation difference between the revolving body and the stationary body of the steam turbine as early as possible so as to shorten the start-up time but also suppress the efficiency of such facility from deterioration. [0007]
In order to solve the above issue, the steam turbine power generation facility according to the present invention is characterized in including: a boiler to generate steam; a high-pressure turbine into which the steam generated by the boiler flows; an intermediate-pressure turbine into which the steam worked at the high-pressure turbine flows; and a low-pressure turbine into which the steam worked at the intermediate-pressure turbine flows, in which the high-pressure turbine and the

intermediate-pressure turbine are respectively provided with a heating section (described below) which is formed by communicating through the high-pressure and intermediate-pressure turbines; the steam turbine power generation facility further including a pipe to make the steam worked at the high-pressure turbine flow into the heating section. [0008]
Further, the operation method of the steam turbine power generation facility according to the present invention is characterized in manipulating the opening/closing of: first valves which are disposed on a pipe to make the steam worked at the high-pressure turbine flow into the intermediate-pressure turbine; second valves which are disposed on a pipe which is branched from the pipe to make the steam worked at the high-pressure turbine flow into the intermediate-pressure turbine and makes the steam worked at the high-pressure turbine flow into a heating section; third valves which are disposed on a pipe to make the steam worked at the intermediate-pressure turbine flow into the low-pressure turbine; and fourth valves which are disposed on a pipe which is branched from the pipe to make the steam worked at the intermediate-pressure turbine flow into the low-pressure turbine and makes the steam worked at the intermediate-pressure

6
turbine flow into the heating section, in which the first valves, the third valves, and the fourth valves are in closed condition while the second valves are in opened condition under an operation over a first load range. 5 [0009]
According to the present invention, it is possible to provide a steam turbine power generation facility and an operation method of the steam turbine power generation facility not only overcoming the thermal elongation
10 difference between the revolving body and the stationary body of the steam turbine so as to shorten the start-up time but also suppress the deterioration of the efficiency of such facility. [0010]
15 It should be noted that the issues, arrangements and
effects other than depicted above are clarified according to the explanation of the following embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS 20 [0011]
FIG. 1 is a schematic view illustrating the
structure of the steam turbine power generation facility
according to a first embodiment;
FIG. 2 is a schematic view illustrating the
25 structure of the steam turbine power generation facility

7
according to a second embodiment;
FIG. 3 is a schematic view illustrating the
structure of the steam turbine power generation facility
according to a third embodiment; and
5 FIG. 4 is a schematic view illustrating the
structure of the steam turbine power generation facility
according to a fourth embodiment.
DETAILED DESCRIPTION 10 [0012]
Hereinafter, the embodiments according to the
present invention are explained with reference to the
accompanying drawings. To note, the same or similar
features are denoted with the same reference signs, in 15 which upon certain explanations being overlapped, there
are some cases where such explanations are omitted.
First Embodiment
[0013]
FIG. 1 is a schematic view illustrating the 20 structure of the steam turbine power generation facility
according to a first embodiment.
[0014]
The steam turbine power generation facility
according to the present embodiment includes: a boiler 20 25 to generate steam; a high-pressure turbine (HP) 30 into

8
which the steam generated by the boiler 20 flows; an intermediate-pressure turbine (IP) 40 into which the steam (reheated steam) worked at the high-pressure turbine 30 flows; a first low-pressure turbine (LP1) 60 into which 5 the steam worked at the intermediate-pressure turbine 40 flows; a generator (GEN) 50 which is driven by the high-pressure turbine 30, the intermediate-pressure turbine 40 and/or the first low-pressure turbine 60; and a first condenser 80 to condense the steam worked at the first
10 low-pressure turbine 60 into water. [0015]
To note, according to the present embodiment, the high-pressure turbine 30, the intermediate-pressure turbine 40, the generator 50, and the first low-pressure
15 turbine 60 are connected to one another in this order, but they may be connected to one another in the order of the high-pressure turbine 30, the intermediate-pressure turbine 40, the first low-pressure turbine 60, and the generator 50.
20 [0016]
It should be noted that the high-pressure turbine 30, the intermediate-pressure turbine 40, and the first low-pressure turbine 60 are all steam turbines. [0017]
25 Then, a casing flange heating section (a steam pipe

9
for heating the casing flange heating portion, hereinafter, just referred to as ‘heating section’ in some cases) 700 is formed in the vicinity of the rotary shaft (casing flange) of the high-pressure turbine 30 and the 5 intermediate-pressure turbine 40. These heating sections 700 are formed by communicating through the high-pressure turbine 30 and the intermediate-pressure turbine 40. Steam flows into such heating section 700, thereby, overcoming the thermal elongation difference between the
10 revolving body (or rotor) and the stationary body (or
casing) of the high-pressure turbine 30 and the thermal elongation difference between the revolving body (or rotor) and the stationary body (or casing) of the intermediate-pressure turbine 40, which leads to
15 successfully shortening the start-up time of the steam turbine power generation facility. [0018]
Further, the steam turbine power generation facility according to the present embodiment is provided with a
20 pipe 800 (main steam in-flow pipe) to make the steam
generated by the boiler 20 flow into the frontal stage side of the high-pressure turbine 30; a pipe 900
(intermediate-pressure turbine steam in-flow pipe) to make the steam (reheated steam) worked at the high-pressure
25 turbine 30 flow into the frontal stage side of the

10
intermediate-pressure turbine 40; and a pipe 500 (low-pressure turbine steam in-flow pipe) to make the steam worked at the intermediate-pressure turbine 40 flow into the frontal stage side of the first low-pressure turbine 5 60 (which is flowed out from the rear stage side of the intermediate-pressure turbine 40). [0019]
To note, according to the present embodiment, the steam worked at the high-pressure turbine 30 is reheated
10 by the boiler 20 and the reheated steam is flowed into the intermediate-pressure turbine 40. In other words, the pipe 900 interconnects the high-pressure turbine 30, the boiler 20, and the intermediate-pressure turbine 40. [0020]
15 Further, the steam turbine power generation facility
according to the present embodiment is provided with a pipe 200 (in-flow pipe of the steam for heating the casing flange heating portion) which is branched from the pipe 900 and makes the steam (reheated steam) worked at the
20 high-pressure turbine 30 flow into the heating section
(casing flange) 700; a pipe 300 (a condensing pipe of the steam for heating the casing flange heating portion) to make the steam worked at the heating section 700 flow into the first condenser 80; and a pipe 400 (in-flow pipe of
25 the steam for heating the second casing flange heating

11
portion) which is branched from the pipe 500 and makes the
steam worked at the intermediate-pressure turbine 40 flow
into the heating section (casing flange) 700.
[0021]
5 In short, according to the present embodiment, such
facility is provided with the pipe 200 to make the steam worked at the high-pressure turbine 30 flow into the heating section (casing flange) 700, in which the pipe 200 is a pipe is branched from the pipe 900 to make the steam
10 worked at the high-pressure turbine 30 flow into the intermediate-pressure turbine 40. [0022]
Further, according to the present embodiment, such facility is provided with the pipe 400 to make the steam
15 worked at the intermediate-pressure turbine 40 flow into
the heating section (casing flange) 700, in which the pipe 400 is a pipe is branched from the pipe 500 to make the steam worked at the intermediate-pressure turbine 40 flow into the first low-pressure turbine 60.
20 [0023]
In addition, in order to suppress the temperature of the intermediate-pressure turbine 40 from rising, such facility is provided with a pipe 600 (steam in-flow pipe to the first condenser) to make the steam worked at the
25 intermediate-pressure turbine 40 flow into the first

12
condenser 80 from the rear stage side of the intermediate-
pressure turbine 40 by detouring the first low-pressure
turbine 60.
[0024]
5 The steam flowing through the pipe 200 (in-flow pipe
of the steam for heating the casing flange heating portion) is steam (for heating the casing flange heating portion) intended for heating the heating section 700 (for heating the casing flange); and flows in from the heating
10 section 700 on the rear stage side of the intermediate-pressure turbine 40 and flows out from the heating section 700 on the frontal stage side of the high-pressure turbine 30. [0025]
15 In short, the pipe 200 to make the steam worked at
the high-pressure turbine 30 flow into the heating section (casing flange) 700 is connected to the heating section (casing flange) 700 on the rear stage side of the intermediate-pressure turbine 40.
20 [0026]
Likewise, the steam flowing through the pipe 400 (in-flow pipe of the steam for heating the second casing flange heating portion) is steam (for heating the casing flange heating portion) intended for heating the heating
25 section 700 (for heating the casing flange); and flows in

13
from the heating section 700 on the rear stage side of the intermediate-pressure turbine 40 and flows out from the heating section 700 on the frontal stage side of the high-pressure turbine 30. 5 [0027]
In short, the pipe 400 to make the steam worked at the intermediate-pressure turbine 40 flow into the heating section (casing flange) 700 is connected to the heating section (casing flange) 700 on the rear stage side of the
10 intermediate-pressure turbine 40. [0028]
In this way, the provision of the pipe 200 and the pipe 400 according to the present embodiment, in other words, the steam flowing through the pipe 200 and the pipe
15 400 respectively overcomes the thermal elongation
difference between the revolving body and the stationary body of the high-pressure turbine 30 and the thermal elongation difference between such bodies of the intermediate-pressure turbine 40 so as to successfully
20 shorten the start-up time of the steam turbine power generation facility. Then, by utilizing the steam generated by the steam turbine power generation facility or by doing without any other supply source to feed (generate) the steam to overcome such thermal elongation
25 difference in terms of the steam turbine power generation

14
facility, it is unnecessary to enhance energy with which
to feed such steam, thus successfully suppressing the
efficiency of such facility from deterioration.
[0029]
5 Moreover, the steam turbine power generation
facility according to the present embodiment is provided: on the pipe 800, with valves M (main steam stop valve (MSV) 1 and main steam amount control valve (MCV) 2) to adjust the amount of the steam flowing into the high-10 pressure turbine 30; with valves A (first valves or
intermediate-pressure turbine in-flow steam stop valve (ASV) 3 and intermediate-pressure turbine in-flow steam amount control valve (ACV) 4, which are disposed on a pipe directed to the intermediate-pressure turbine 40 after the 15 branching of the pipe 900) to adjust the amount of the
steam flowing into the intermediate-pressure turbine 40 after the branching of the pipe 900; and with valves E (third valves or low-pressure turbine in-flow steam stop valve (ESV) 10 and low-pressure turbine in-flow steam 20 amount control valve (ECV) 11, which are disposed on a
pipe directed to the first low-pressure turbine 60 after the branching of the pipe 500) to adjust the amount of the steam flowing into the first low-pressure turbine 60 after the branching of the pipe 500. 25 [0030]

15
In addition, the steam turbine power generation facility according to the present embodiment is provided: on the pipe 200, with valves B (second valves or first casing flange in-flow steam stop valve (BSV) 5 and first 5 casing flange in-flow steam amount control valve (BCV) 6, which are disposed on the pipe 200 branched from the pipe 900 and directed to the heating section 700) to adjust the amount of the steam (steam for heating the casing flange heating portion) flowing into the heating section 700; on
10 the pipe 400, with valves C (fourth valves or second
casing flange in-flow steam stop valve (CSV) 7 and second casing flange in-flow steam amount control valve (CCV) 8, which are disposed on the pipe 400 branched from the pipe 500 and directed to the heating section 700) to adjust the
15 amount of the steam (steam for heating the casing flange
heating portion) flowing into the heating section 700; and on the pipe 600, with a valve D (intermediate-pressure out-flow steam (vacuum) stop valve (DSV) 9) to switch on/off the steam flowing into the first condenser 80.
20 [0031]
In short, the first valves (valves A) are disposed on the pipe 900 (after branched) to make the steam worked at the high-pressure turbine 30 flow into the intermediate-pressure turbine 40; the second valves
25 (valves B) are disposed on the pipe 200 which is branched

16
from the pipe 900 to make the steam worked at the high-pressure turbine 30 flow into the intermediate-pressure turbine 40 and makes the steam worked at the high-pressure turbine 30 flow into the heating section 700; the third 5 valves (valves E) are disposed on the pipe 500 (after
branched) to make the steam worked at the intermediate-pressure turbine 40 flow into the first low-pressure turbine 60; and the fourth valves (valves C) are disposed on the pipe 400 which is branched from the pipe 500 to
10 make the steam worked at the intermediate-pressure turbine 40 flow into the first low-pressure turbine 60 and makes the steam worked at the intermediate-pressure turbine 40 flow into the heating section 700. [0032]
15 The operation method of the steam turbine power
generation facility according to the present embodiment is as follows, in which the method of manipulating the opening/closing of the valves respectively is disclosed. [0033]
20 Under the operation over the low load range (the
first range), it is prescribed that the valves A, the valves C, and the valves E are in closed condition whereas the valves B, the valve D, and the valves M are in opened condition.
25 [0034]

17
Steam flows into the high-pressure turbine 30 from the boiler 20 (in which the valves M are opened), and the generator 50 is driven with the driving of the high-pressure turbine 30. 5 [0035]
The steam worked at the high-pressure turbine 30 is reheated by the boiler 20, and the reheated steam flows through the pipe 200 so as to flow into the heating section 700) (in which the valves A are closed whereas the 10 valves B are opened). [0036]
Then, the steam flowing into the heating section is utilized for heating the casing flange heating portion of the heating section 700 at the casing flange of the high-15 pressure turbine 30 and the intermediate-pressure turbine 40 respectively. Thereafter, the steam, which has been utilized for heating the casing flanges and whose temperature has lowered, flows through the pipe 300 so as to flow into the first condenser 80 and be condensed into 20 water. [0037]
Under the operation over the low to middle load range (the second range higher in load than the first range), it is prescribed that the valves M are in opened 25 condition; the valves A and the valves C transit from the

18
closed condition to the opened condition; the valves B and
the valve D transit from the opened condition to the
closed condition; and the valves E are in closed condition.
[0038]
5 Steam flows into the high-pressure turbine 30 from
the boiler 20 (in which the valves M are opened), and the steam worked at the high-pressure turbine 30 is reheated by the boiler 20 so as to flow through the pipe 900 (in which the valves A are opened while the valves B are
10 closed) and flow into the intermediate-pressure turbine 40, thereby, the high-pressure turbine 30 and the
intermediate-pressure turbine 40 being driven, which leads to driving the generator 50. [0039]
15 The steam worked at the intermediate-pressure
turbine 40 flows through the pipe 400 (in which the valves C are opened while the valves E are closed) so as to flow into the heating section 700. [0040]
20 Then, this steam is utilized for heating the casing
flange heating portions of the heating sections 700 at the casing flanges of the high-pressure turbine 30 and the intermediate-pressure turbine 40. Thereafter, the steam, which has been utilized for heating the casing flanges and
25 whose temperature has lowered, flows through the pipe 300

19
so as to flow into the first condenser 80 and be condensed
into water.
[0041]
Under the operation over the middle load range (the 5 third range higher in load than the second range), it is prescribed that the valves A and the valves M are in opened condition; the valves C transit from the opened condition to the closed condition; the valves E transit from the closed condition to the opened condition; and the
10 valves B and the valve D are in closed condition. [0042]
Steam flows into the high-pressure turbine 30 from the boiler 20 (in which the valves M are opened); the steam worked at the high-pressure turbine 30 is reheated
15 by the boiler 20; the reheated steam flows through the pipe 900 (in which the valves A are opened while the valves B are closed) so as to flow into the intermediate-pressure turbine 40; the steam worked at the intermediate-pressure turbine 40 flows through the pipe 500 (in which
20 the valves C are closed while the valves E are opened) so
as to flow into the first low-pressure turbine 60, thereby, the high-pressure turbine 30, the intermediate-pressure turbine 40, and the first low-pressure turbine 60 are driven, which leads to driving the generator 50; and the
25 steam worked at the first low-pressure turbine 60 flows

20
into the first condenser 80 so as to be condensed into
water.
[0043]
To note, under the operation over the middle load 5 range above, the steam for heating the casing flange
heating portion does not flow to the heating section 700 of the casing flange at the high-pressure turbine 30 and the intermediate-pressure turbine 40 respectively. [0044]
10 As described above, according to the present
embodiment, it is possible to provide a steam turbine power generation facility and an operation method of the steam turbine power generation facility not only overcoming the thermal elongation difference (at the
15 heating section 700) between the revolving body and the
stationary body of the turbine so as to shorten the start-up time of such facility but also suppress the efficiency of such facility from deterioration. Second Embodiment
20 [0045]
FIG. 2 is a schematic view illustrating the structure of the steam turbine power generation facility according to a second embodiment. [0046]
25 The steam turbine power generation facility

21
according to the present embodiment includes: a boiler 20 to generate steam; a high-pressure turbine (HP) 30 into which the steam generated by the boiler 20 flows; an intermediate-pressure turbine (IP) 40 into which the steam 5 worked at the high-pressure turbine 30 flows; a first low-pressure turbine (LP1) 60 into which the steam worked at the intermediate-pressure turbine 40 flows; a generator (GEN) 50 which is driven by the high-pressure turbine 30, the intermediate-pressure turbine 40 and/or the first low-10 pressure turbine 60; and a first condenser 80 to condense
the steam worked at the first low-pressure turbine 60 into
water.
[0047]
The present embodiment differs from the first 15 embodiment in that the steam worked at the high-pressure turbine 30 is not reheated by the boiler 20 but directly flowed into the intermediate-pressure turbine 40. In short, the pipe 900 interconnects the high-pressure turbine 30 and the intermediate-pressure turbine 40. 20 [0048]
It should be noted that the other pipes are the same as those of the first embodiment and the places where the valves are disposed are the same as those of the first embodiment. 25 [0049]

22
In addition, the operation method of the steam turbine power generation facility according to the present embodiment is the same as that according to the first embodiment. 5 [0050]
In this way, the steam turbine power generation facility and operation method of such facility according to the present embodiment bring the same advantageous effects as those brought by the counterparts according to
10 the first embodiment. Third Embodiment [0051]
FIG. 3 is a schematic view illustrating the structure of the steam turbine power generation facility
15 according to a third embodiment. [0052]
The steam turbine power generation facility according to the present embodiment includes: a boiler 20 to generate steam; a high-pressure turbine (HP) 30 into
20 which the steam generated by the boiler 20 flows; an
intermediate-pressure turbine (IP) 40 into which the steam (reheated steam) worked at the high-pressure turbine 30 flows; a first low-pressure turbine (LP1) 60 into which the steam worked at the intermediate-pressure turbine 40
25 flows; a second low-pressure turbine (LP2) 70 into which

23
the steam worked at the intermediate-pressure turbine 40 flows; a generator (GEN) 50 which is driven by the high-pressure turbine 30, the intermediate-pressure turbine 40, the first low-pressure turbine 60, and/or the second low-5 pressure turbine (LP2) 70; a first condenser 80 to
condense the steam worked at the first low-pressure turbine 60 into water; and a second condenser 90 to condense the steam worked at the second low-pressure turbine 70 into water. 10 [0053]
Further, a clutch 100 is disposed between the first low-pressure turbine 60 and the second low-pressure turbine 70. The coupling condition between the first low-pressure turbine 60 and the second low-pressure turbine 70 15 is switched on and off with such clutch 100. [0054]
To note, according to the present embodiment, the high-pressure turbine 30, the intermediate-pressure turbine 40, the generator 50, the first low-pressure 20 turbine 60, and the second low-pressure turbine 70 are connected to one another in this order. [0055]
It should be noted that the high-pressure turbine 30, the intermediate-pressure turbine 40, the first low-25 pressure turbine 60, and the second low-pressure turbine

24
70 are all steam turbines. [0056]
Then, a casing flange heating section (a steam pipe for heating the casing flange heating portion, hereinafter, 5 just referred to as ‘heating section’ in some cases) 700 is formed in the vicinity of the rotary shaft (casing flange) of the high-pressure turbine 30 and the
intermediate-pressure turbine 40. These heating sections 700 are formed by communicating through the high-pressure
10 turbine 30 and the intermediate-pressure turbine 40. Steam flows into the heating sections 700, thereby, leading to overcoming the thermal elongation difference between the revolving body (rotor) and the stationary body (casing) of the high-pressure turbine 30 and the thermal
15 elongation difference between the revolving body (rotor) and the stationary body (casing) of the intermediate-pressure turbine 40. This permits the start-up time of the steam turbine power generation facility to be shortened.
20 [0057]
Further, the steam turbine power generation facility according to the present embodiment is provided with a pipe 800 (main steam in-flow pipe) to make the steam generated by the boiler 20 flow into the frontal stage
25 side of the high-pressure turbine 30; a pipe 900

25
(intermediate-pressure turbine steam in-flow pipe) to make the steam (reheated steam) worked at the high-pressure turbine 30 flow into the frontal stage side of the intermediate-pressure turbine 40 (which steam is flowed 5 out from the rear stage side of the high-pressure turbine 30); and a pipe 500 (low-pressure turbine steam in-flow pipe) to make the steam worked at the intermediate-pressure turbine 40 flow into the frontal stage side of the first low-pressure turbine 60 and/or the frontal stage
10 side of the second low-pressure turbine 70 (which is
flowed out from the rear stage side of the intermediate-pressure turbine 40). [0058]
To note, according to the present embodiment, the
15 steam worked at the high-pressure turbine 30 is reheated by the boiler 20, and such reheated steam is flowed into the intermediate-pressure turbine 40. In short, the pipe 900 interconnects the high-pressure turbine 30, the boiler 20, and the intermediate-pressure turbine 40.
20 [0059]
In addition, the steam turbine power generation facility according to the present embodiment is provided with a pipe 200 (in-flow pipe of the steam for heating the casing flange heating portion) which is branched from the
25 pipe 900 and makes the steam (reheated steam) worked at

26
the high-pressure turbine 30 flow into the heating section (casing flange) 700; a pipe 300 (condensing pipe of the steam for heating the casing flange heating portion) to make the steam worked at the heating section 700 flow into 5 the first condenser 80; and a pipe 400 (in-flow pipe of the steam for heating the second casing flange heating portion) which is branched from the pipe 500 and makes the steam worked at the intermediate-pressure turbine 40 flow into the heating section (casing flange) 700.
10 [0060]
In short, the steam turbine power generation facility according to the present embodiment is provided with the pipe 200 to make the steam worked at the high-pressure turbine 30 flow into the heating section (casing
15 flange) 700, in which the pipe 200 corresponds to a pipe
branched from the pipe 900 to make the steam worked at the high-pressure turbine 30 flow into the intermediate-pressure turbine 40. [0061]
20 Further, the steam turbine power generation facility
according to the present embodiment is provided with the pipe 400 to make the steam worked at the intermediate-pressure turbine 40 flow into the heating section (casing flange) 700, in which the pipe 400 corresponds to a pipe
25 branched from the pipe 500 to make the steam worked at the

27
intermediate-pressure turbine 40 flow into the first low-
pressure turbine 60 and/or the second low-pressure turbine
70.
80: first condenser
90: second condenser
100: clutch
5 700: heating section

We claim:

A steam turbine power generation facility
comprising:
a boiler to generate steam;
a high-pressure turbine into which the steam generated by the boiler flows;
an intermediate-pressure turbine into which steam worked at the high-pressure turbine flows; and
a low-pressure turbine into which steam worked at the intermediate-pressure turbine flows,
wherein the high-pressure turbine and the intermediate-pressure turbine are respectively provided with a heating section which is formed by communicating through the high-pressure turbine and the intermediate-pressure turbine,
the steam turbine power generation facility further comprising a pipe to make the steam worked at the high-pressure turbine flow into the heating section.
2. The steam turbine power generation facility
according to claim 1, wherein the pipe to make the steam
worked at the high-pressure turbine flow into the heating
section is connected to the heating section on a rear
stage side of the intermediate-pressure turbine.

3. The steam turbine power generation facility
according to claim 2, further comprising a pipe to make
the steam worked at the high-pressure turbine flow into
the intermediate-pressure turbine,
wherein the pipe to make the steam worked at the high-pressure turbine flow into the heating section is a pipe branched from the pipe to make the steam worked at the high-pressure turbine flow into the intermediate-pressure turbine.
4. The steam turbine power generation facility according to claim 1, further comprising a pipe to make the steam worked at the intermediate-pressure turbine flow into the heating section.
5. The steam turbine power generation facility according to claim 4, wherein the pipe to make the steam worked at the intermediate-pressure turbine flow into the heating section is connected to the heating section on the rear stage side of the intermediate-pressure turbine.
6. The steam turbine power generation facility according to claim 5, further comprising a pipe to make the steam worked at the intermediate-pressure turbine flow

into the low-pressure turbine,
wherein the pipe to make the steam worked at the intermediate-pressure turbine flow into the heating section is a pipe branched from the pipe to make the steam worked at the intermediate-pressure turbine flow into the low-pressure turbine.
7. The steam turbine power generation facility according to claim 3, wherein the pipe to make the steam worked at the high-pressure turbine flow into the intermediate-pressure turbine and the pipe which is branched from the pipe to make the steam worked at the high-pressure turbine flow into the intermediate-pressure turbine and makes the steam worked at the high-pressure turbine flow into the heating section are respectively provided with a valve to adjust an amount of steam.
8. The steam turbine power generation facility according to claim 7, wherein the pipe to make the steam worked at the intermediate-pressure turbine flow into the low-pressure turbine and the pipe which is branched from the pipe to make the steam worked at the intermediate-pressure turbine flow into the low-pressure turbine and makes the steam worked at the intermediate-pressure turbine flow into the heating section are respectively

provided with a valve to adjust an amount of steam.
9. An operation method of a steam turbine power
generation facility to manipulate opening/closing of:
first valves which are disposed on a pipe to make steam
worked at a high-pressure turbine flow into an
intermediate-pressure turbine; second valves which are
disposed on a pipe which is branched from the pipe to make
the steam worked at the high-pressure turbine flow into
the intermediate-pressure turbine and makes the steam
worked at the high-pressure turbine flow into a heating
section; third valves which are disposed on a pipe to make
steam worked at the intermediate-pressure turbine flow
into a low-pressure turbine; and fourth valves which are
disposed on the pipe which is branched from the pipe to
make the steam worked at the intermediate-pressure turbine
flow into the low-pressure turbine and makes the steam
worked at the intermediate-pressure turbine flow into the
heating section,
wherein the first valves, the third valves, and the fourth valves are in closed condition while the second valves are in opened condition under an operation over a first load range.
10. The operation method of a steam turbine power

generation facility according to claim 9, wherein the first valves and the fourth valves are in opened condition while the second valves and the third valves are in closed condition under an operation over a second load range whose load is larger than the first load range.
11. The operation method of a steam turbine power generation facility according to claim 10, wherein the first valves and the third valves are in opened condition while the second valves and the fourth valves are in closed condition under an operation over a third load range whose load is larger than the second load range.