PH12018000172A1 - Extraction control method for steam turbine generator - Google Patents
Extraction control method for steam turbine generator Download PDFInfo
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- PH12018000172A1 PH12018000172A1 PH12018000172A PH12018000172A PH12018000172A1 PH 12018000172 A1 PH12018000172 A1 PH 12018000172A1 PH 12018000172 A PH12018000172 A PH 12018000172A PH 12018000172 A PH12018000172 A PH 12018000172A PH 12018000172 A1 PH12018000172 A1 PH 12018000172A1
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- steam
- extraction
- amount
- generator
- turbine
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- 238000000605 extraction Methods 0.000 title claims abstract description 143
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000001105 regulatory effect Effects 0.000 description 17
- 239000000284 extract Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000010485 coping Effects 0.000 description 1
- RLQJEEJISHYWON-UHFFFAOYSA-N flonicamid Chemical compound FC(F)(F)C1=CC=NC=C1C(=O)NCC#N RLQJEEJISHYWON-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004326 stimulated echo acquisition mode for imaging Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Control Of Turbines (AREA)
Abstract
Proposed is an extraction control method for a steam turbine generator which enables to reduce an excessively large amount of extraction steam to be released into the atmosphere and to maintain a stable generator output even when a generator load or an amount of extraction steam to be used in a factory unexpectedly and rapidly fluctuates. In the steam turbine generator including a steam flowmeter at an extraction outlet of the steam turbine and an automatically-controlled relief valve in an extraction line, a set value of a required amount of extraction steam which corresponds to a generator load is obtained by calculation based on characteristics of an amount of inlet steam and an amount of extraction steam with respect to a generator output of the steam turbine generator, and surplus steam is independently controlled by the relief valve based on the set value.
Description
extraction line can be automatically controlled in an - independent manner based on an appropriate amount of - extraction steam which corresponds to a generator load. =
Thus, it is possible to prevent an excessively large amount i. of extraction steam from being released into the atmosphere. =
At the same time, even when a generator load or an amount of extraction steam to be used in a factory unexpectedly ~ and rapidly fluctuates, a stable generator output can be o maintained. Further, the steam flowmeter and the 2 automatically-controlled relief valve installed to the extraction line can be easily and additionally installed to an existing turbine generator control device without applying any change to the existing turbine generator control device. Therefore, there is no possibility of equipment cost becoming high.
FIG. 1 is a schematic view showing a system configuration example for carrying out an extraction control method for a steam turbine generator according to the present invention:
FIG. 2 is an explanatory view showing a setting example 1 of a required amount of extraction steam with respect to a generator load in the system configuration example of the present invention shown in FIG. 1;
FIG. 3 is an explanatory view showing a setting example 2 of a required amount of extraction steam with respect to a generator load in the system configuration ~ example of the present invention shown in FIG. 1; H
FIG. 4 is an explanatory view showing a valve opening = of an automatically-controlled relief valve in the system o configuration example of the present invention shown in =
FIG. 1;
FIG. 5 is a schematic view showing a system = configuration example of a conventional internal & extraction pressure control type turbine generator; and ro
FIG. 6 is an explanatory view showing the relation between an amount of inlet steam and an amount of extraction steam with respect to a generator output in the conventional system configuration example shown in FIG. 5.
The system configuration for carrying out an extraction control method for a steam turbine generator according to the present invention as shown FIG. 1 includes: an extraction turbine type steam turbine 1 which converts a thermal energy of steam introduced from a superheated steam producing boiler (not shown) into a drive energy; a steam regulating valve 2 which adjusts a flow rate of steam to be introduced through a steam introducing port 2-1; an extraction regulating valve 3; an extraction pressure gauge 4; a speed indicator 5; a speed governor 6; a condenser 7; an extraction line 8; a steam flowmeter 9 installed at an extraction outlet of the steam turbine 1;
a calculation control device 10; and an automatically- ~ controlled relief valve (adjusting valve) 11. Also in the - system configuration according to the present invention, = the steam turbine 1 has a high pressure stage 1-1 and a eo low pressure stage 1-2. Steam which flows into the high = pressure stage 1-1 is extracted on the upstream side of the extraction regulating valve 3, a flow of steam into - the low pressure stage 1-2 is controlled by the extraction © regulating valve 3, and steam is then supplied to a factory - through the extraction line 8. In the system configuration example, the configurations of constitutional elements other than the steam flowmeter 9, the calculation control device 10, and the automatically-controlled relief valve 11 are substantially equal to the configurations of corresponding constitutional elements in the conventional art shown in FIG. 5. A distributed control system (DCS) or a programmable logic controller (PLC) is usually employed for the calculation control device 10. However, a general controller may also be used for the calculation control device 10. In the system configuration according to the present invention, a steam flowmeter and a relief valve which allows a sufficient amount of steam to flow therethrough are used for the steam flowmeter 9 and the relief valve 11. In measuring a flow rate of steam at the turbine extraction outlet, the difference between a flow rate of steam at the turbine inlet and a flow rate of water at an cutlet of the condenser 7 which is used for treating turbine exhaust may also be used.
In the extraction control method for a steam turbine w generator according to the present invention, when steam =” is extracted from an intermediate stage of the steam i. turbine 1 to supply the steam to a factory, a value = measured by the steam flowmeter 9 installed at the - extraction outlet of the steam turbine 1 is inputted into = the calculation control device 10 with respect to z fluctuation in a generator load or an amount of extraction - steam to be used in a factory. In response to such instruction from the steam flowmeter 9, a required flow rate is set by the calculation control device 10, and an opening of the relief valve 11 is automatically controlled corresponding to the set value.
To describe specifically, when extraction steam is supplied to a factory, a sum of an amount of extraction steam to be used in the factory and an amount of steam to be released into the atmosphere becomes an amount of extraction steam. Accordingly, as shown in FIG. 4, when an amount of extraction steam to be used in the factory exceeds a required amount of extraction steam, an opening of the relief valve 11 is closed. On the other hand, when an amount of extraction steam to be used in the factory is lower than the required amount of extraction steam, the relief valve 11 is automatically controlled such that an opening of the relief valve 11 is opened so as to release surplus steam into the atmosphere thus maintaining the required amount of extraction steam. In this regard, a set value of an amount of extraction steam is obtained by - calculating an appropriate amount of extraction steam . which corresponds to a generator load by the calculation & control device 10, and the opening of the relief valve 11 ox is controlled according to the set value. For the = appropriate amount of extraction steam which corresponds i. to the generator load, an appropriate amount of extraction - steam which corresponds to a generator load can be set © based on characteristics of each turbine generator, that - is, the relation between an amount of inlet steam and an amount of extraction steam with respect to a generator output shown in FIG. 2. In an actual operation, it is desirable to use an actual value of an amount of actual extraction steam obtained from operation results of the turbine generator. FIG. 2 and FIG. 3 show setting examples of the amount of extraction steam.
Particularly, as shown in the setting example 1 (FIG. 2) and the setting example 2 (FIG. 3) of a required amount of extraction steam with respect to a generator load, the present invention sets the required amount of extraction steam in a state where three regions consisting of a region
A, a region B, and a region C are defined corresponding to respective generator loads. In this regard, the region A is a region where a factory is completely stopped so that heating, heat retention, or the like performed by steam is not necessary whereby extraction is unnecessary. The region B is a region where a required amount of extraction steam is set to 0 (T/Hr) so that existing extraction ~ pressure control is unstable. The region C is a region where an amount of extraction steam is made constant, and = an amount of extraction steam 1s required to increase o corresponding to a turbine output. In the present = invention, a set value is obtained by calculation such o that a required amount of extraction steam is proportional = to a generator load in these three regions. Strictly © speaking, for the region C, a required amount of extraction - steam is not proportional to a generator load and hence, a control may be performed in a state where the region C is subdivided.
As has been described above, the extraction control method for a steam turbine generator according to the present invention enables to reduce an excessively large amount of extraction steam to be released into the atmosphere and to maintain a stable generator output even when a generator load or an amount of extraction steam to be used in a factory unexpectedly and rapidly fluctuates, by automatically controlling the relief valve in an independent manner based on an appropriate amount of extraction steam which corresponds to a generator load.
Further, by employing the system where the steam flowmeter and the relief valve installed to the extraction line are controlled in an independent manner from a control device of an existing turbine generator, the present invention can be easily carried out without changing the control - device of the existing turbine generator. -
Reference Signs List - ° 1 steam turbine . 1-1 high pressure stage - 1-2 low pressure stage © 2 steam regulating valve 2-1 steam introducing port 3 extraction regulating valve 4 extraction pressure gauge 5 speed indicator 6 speed governor 7 condenser 8 extraction line 9 steam flowmeter 10 calculation control device 11 relief valve (adjusting valve)
4 J A
EXTRACTION CONTROL METHOD FOR STEAM TURBINE GENERATOR =
The present invention relates to an extraction control © method for a steam turbine generator which extracts steam - from an intermediate stage of a turbine and supplies the steam to a factory, and more specifically to an extraction control method which can appropriately «cope with fluctuation in generator load and in amount of extraction steam to be used in a factory.
For steam turbine generators which extract steam from an intermediate stage of a turbine and supply the steam to a factory, an internal extraction pressure control type turbine generator is known where a pressure control valve is provided in the inside of a casing of the turbine, and a pressure control 1s performed on the upstream side of the pressure control valve so as to maintain a constant extraction pressure thereby allowing a stable pressure supply at every turbine load level from a low load to the rated load. The internal extraction pressure control type turbine generator is composed of: an extraction turbine type steam turbine 21 which converts a thermal energy of steam introduced from a boiler for producing superheated ~ steam (not shown in the drawing) into a drive energy; a - steam regulating valve 22 which adjusts a flow rate of =: pe steam to be introduced through a steam introducing port ne 22-1; an extraction regulating valve 23; an extraction = pressure gauge 24; a speed indicator 25; a speed governor 26; a condenser 27; and a relief valve 28, as this system - configuration example is shown in FIG. 5. The steam © turbine 21 has a high pressure stage 21-1 and a low = pressure stage 21-2. Steam which flows into the high pressure stage 21-1 of the steam turbine 21 is extracted on the upstream side of the extraction regulating valve 23, a flow of steam into the low pressure stage 21-2 is controlled by the extraction regulating valve 23, and the steam is then supplied to a factory through an extraction line 209.
In controlling the extraction turbine type steam turbine 21 in the internal extraction pressure control type turbine generator, a revolution speed measured by the speed indicator 25 and an extraction pressure measured by the extraction pressure gauge 24 are required. When a load on the steam turbine 21 or a required amount of extraction fluctuates, it is necessary to control the limit of the steam regulating valve 22 and the limit of the extraction regulating valve 23. For this reason, the internal extraction pressure control type turbine generator has a mechanism which automatically controls both valves of the steam regulating valve 22 and the ~ extraction regulating valve 23 to maintain a revolution speed of the steam turbine 21, a generator output and = extraction. Fe §
FIG. 6 is a graph illustrating the relation between a ; generator output, an amount of inlet steam, and an amount - of extraction steam in the above-mentioned internal © extraction pressure control type turbine generator. An = output (a) of the turbine generator indicates a turbine output when the amount of extraction steam is at maximum.
An output (b) of the turbine generator indicates a turbine output when the amount of extraction steam is 0 (T/Hr).
An output (c) of the turbine generator indicates a minimum capacity of the generator. That is, when the generator is operated in a state where a generator load exceeds a certain point, it is necessary to extract steam by a fixed amount or more so as to maintain a generator output.
Accordingly, as shown in FIG. 5, the relief valve 28 is provided to the extraction line so as to release surplus steam into the atmosphere. When a generator load or an amount of extraction steam to be used in a factory fluctuates, the relief valve 28 is opened or closed to maintain a required amount of extraction steam.
A manual valve or an automatically-controlled adjusting valve is used for the relief valve 28. When the manual valve is used for the relief valve 28, the relief valve 28 is controlled to a valve opening with an allowance ~ in advance roughly corresponding to a generator load and - a flow rate of inlet steam. On the other hand, for a =z method where the automatically-controlled adjusting valve - 1s used, a method is disclosed in Japanese Patent Laid-
Open No. 07-166808 (Patent Literature 1) and Japanese
Patent TLaid-Open No. H11-343814 (Patent Literature 2) = where an adjusting valve for releasing steam into the > atmosphere is installed to an extraction line and, when an : extraction pressure becomes a set pressure or more, an opening of the adjusting valve is automatically controlled by the extraction pressure. The method disclosed in Patent
Literature 1 is a control method where, in a steam turbine control device formed of a speed control device or a load control device and an extraction pressure control device, when an extraction regulating valve becomes a fully opened state or a minimum opening, or when an adjusting valve becomes a fully opened state, a speed control or a load control is excluded from the control, and an extraction pressure control is performed in preference to other controls. Further, the method disclosed in Patent
Literature 2 is a method where, in a boiler turbine generator where an extraction steam passage includes: a turbine bypass pipe through which surplus steam is released to the condenser side; and a load control device which controls boiler steam to be introduced into a steam turbine corresponding to a generator load, the surplus steam is constantly released to the condenser from the extraction steam passage by the turbine bypass pipe through which the - surplus steam is released to the condenser side, an input hs signal of a bypass device which controls a bypass amount o of the bypass pipe is transmitted from the extraction steam i. passage, and a control of an amount of bypass steam which = corresponds to load fluctuation is performed in preference § to a load control device. =
However, the above-mentioned conventional extraction control technique for the steam turbine generator has the following problems.
In the steam turbine generator which extracts steam from the intermediate stage of the turbine and supplies the steam to a factory, when a manual valve is used for the relief valve provided for coping with the fluctuation in generator load and amount of extraction steam to be used in a factory, the relief valve is adjusted to an opening with an allowance in advance roughly corresponding to a generator load and an amount of inlet steam and therefore an excessively large amount of steam is released into the atmosphere. In addition, the manual valve may not cope with an unexpected rapid fluctuate in generator load or amount of extraction steam to be used in a factory.
On the other hand, in the method where the relief valve 1s replaced with an automatically-controlled adjusting valve disclosed in Patent Literatures 1 and 2 so that the adjusting valve is controlled by an extraction ~ pressure, the extraction pressure fluctuates due to - opening and closing of the relief valve. Accordingly, the o control of a steam regulating valve, an extraction > regulating valve and the like, which are controlled by the = extraction pressure in the same manner, is affected and hence, there is a problem that a stable control of these - valves cannot be performed. o os
The present invention has been made in view of the above-mentioned problems of the conventional art, and it is an object of the present invention to propose an extraction control method for a steam turbine generator where a relief valve is automatically controlled in an independent manner based on an appropriate amount of extraction steam which corresponds to a generator load and hence, it is possible to reduce an excessively large amount of extraction steam to be released into the atmosphere and, even when a generator load or an amount of extraction steam to be used in a factory unexpectedly and rapidly fluctuates, a stable generator output can be maintained.
The present invention is directed to an extraction control method for a steam turbine generator configured to extract steam from an intermediate stage of a steam turbine and to supply the steam to a factory, the steam turbine generator including a steam flowmeter at an extraction outlet of the steam turbine and an automatically-
[| EE EERE, controlled relief valve in an extraction line, wherein a ~ set value of a required amount of extraction steam which corresponds to a generator load is obtained by calculation = based on characteristics of an amount of inlet steam and o an amount of extraction steam with respect to a generator = output of the steam turbine generator, and surplus steam . is independently controlled by the relief valve based on = the set value. =
The present invention is characterized in that, in the extraction control method for a steam turbine generator, based on a relation between the generator load and the set value of the required amount of extraction steam, a region
A where extraction is unnecessary, a region B where an existing extraction pressure control is unstable, and a region C where an amount of extraction steam is required to increase corresponding to a turbine output are set, and the required amount of extraction steam is set to 0 (T/Hr) in the region A where the extraction is unnecessary, a constant exhaust amount is set in the region B where the existing extraction pressure control is unstable, and the required amount of extraction steam is set to be proportional to a generator load in the region C where the amount of extraction steam is required to increase corresponding to the turbine output.
According to the extraction control method for a steam turbine generator of the present invention, the automatically-controlled relief valve installed to the
Claims (2)
1. An extraction control method for a steam turbine = po generator configured to extract steam from an intermediate we stage of a steam turbine and to supply the steam to a = factory, the steam turbine generator including a steam o flowmeter at an extraction outlet of the steam turbine and - an automatically-controlled relief valve in an extraction = line, the method comprising: - obtaining a set value of a required amount of extraction steam which corresponds to a generator load by calculation based on characteristics of an amount of inlet steam and an amount of extraction steam with respect to a generator output of the steam turbine generator, and independently controlling surplus steam by the relief valve based on the set value.
2. The extraction control method for a steam turbine generator according to claim 1, wherein based on a relation between the generator load and the set value of the required amount of extraction steam, a region A where extraction is unnecessary, a region B where an existing extraction pressure control is unstable, and a region C where an amount of extraction steam is required to increase corresponding to a turbine output are set, and the required amount of extraction steam is set to 0 (T/Hr) in the region A where the extraction is unnecessary, a constant exhaust amount is set in the region B where the existing extraction
CN pressure control is unstable, and the required amount of - extraction steam is set to be proportional to a generator load in the region C where the amount of extraction steam = is required to increase corresponding to the turbine output. on
’ iE LA
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017122595A JP6516209B2 (en) | 2017-06-22 | 2017-06-22 | Bleeding control method of steam turbine generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PH12018000172B1 PH12018000172B1 (en) | 2019-01-28 |
| PH12018000172A1 true PH12018000172A1 (en) | 2019-01-28 |
Family
ID=65028620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PH12018000172A PH12018000172A1 (en) | 2017-06-22 | 2018-06-21 | Extraction control method for steam turbine generator |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6516209B2 (en) |
| PH (1) | PH12018000172A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3609384A (en) * | 1969-09-03 | 1971-09-28 | Electrodyne Res Corp | Control means for stabilizing a steam-driven reheat-type turbine generator after sudden runback of electric generation |
| US3971219A (en) * | 1975-08-22 | 1976-07-27 | General Electric Company | Turbine control system |
| US4258424A (en) * | 1972-12-29 | 1981-03-24 | Westinghouse Electric Corp. | System and method for operating a steam turbine and an electric power generating plant |
| US20070266710A1 (en) * | 2006-05-18 | 2007-11-22 | Masanori Onuma | Steam turbine plant |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5390544A (en) * | 1977-01-18 | 1978-08-09 | Sumitomo Metal Ind Ltd | Output control method for power plant using extraction turbine |
| JPS59145307A (en) * | 1983-02-07 | 1984-08-20 | Kawasaki Steel Corp | Control system of bleeder condensing turbine in thermal and power generation plant |
| JPH0454204A (en) * | 1990-06-21 | 1992-02-21 | Mitsubishi Heavy Ind Ltd | Control device for gas-extraction and condensation type turbine |
| JPH11294112A (en) * | 1998-04-09 | 1999-10-26 | Mitsubishi Heavy Ind Ltd | Control device for private thermal power generation plant |
| JP3615077B2 (en) * | 1999-03-09 | 2005-01-26 | 株式会社日立製作所 | Operation method of steam turbine plant |
| JP2001317305A (en) * | 2000-05-12 | 2001-11-16 | Babcock Hitachi Kk | Method and device for controlling turbine generator |
-
2017
- 2017-06-22 JP JP2017122595A patent/JP6516209B2/en not_active Expired - Fee Related
-
2018
- 2018-06-21 PH PH12018000172A patent/PH12018000172A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3609384A (en) * | 1969-09-03 | 1971-09-28 | Electrodyne Res Corp | Control means for stabilizing a steam-driven reheat-type turbine generator after sudden runback of electric generation |
| US4258424A (en) * | 1972-12-29 | 1981-03-24 | Westinghouse Electric Corp. | System and method for operating a steam turbine and an electric power generating plant |
| US3971219A (en) * | 1975-08-22 | 1976-07-27 | General Electric Company | Turbine control system |
| US20070266710A1 (en) * | 2006-05-18 | 2007-11-22 | Masanori Onuma | Steam turbine plant |
Also Published As
| Publication number | Publication date |
|---|---|
| PH12018000172B1 (en) | 2019-01-28 |
| JP2019007391A (en) | 2019-01-17 |
| JP6516209B2 (en) | 2019-05-22 |
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