JP4633376B2 - Process steam control system using steam turbine - Google Patents

Process steam control system using steam turbine Download PDF

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JP4633376B2
JP4633376B2 JP2004091197A JP2004091197A JP4633376B2 JP 4633376 B2 JP4633376 B2 JP 4633376B2 JP 2004091197 A JP2004091197 A JP 2004091197A JP 2004091197 A JP2004091197 A JP 2004091197A JP 4633376 B2 JP4633376 B2 JP 4633376B2
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steam
steam turbine
turbine
control valve
nozzle
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JP2005273597A (en
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直樹 松川
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TLV Co Ltd
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TLV Co Ltd
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Description

本発明は、蒸気により蒸気タービンを駆動し発電を行うと共に蒸気タービンから排出されプロセスに供給されるプロセス蒸気を制御する蒸気タービンを利用したプロセス蒸気の制御装置に関する。   The present invention relates to a process steam control apparatus using a steam turbine that drives a steam turbine with steam to generate electric power and controls process steam discharged from the steam turbine and supplied to a process.

従来の蒸気タービンを利用したプロセス蒸気の制御装置は、蒸気により駆動する蒸気タービンと、蒸気タービンに連結され機械エネルギーを電気エネルギーに変換して電気を発生する発電機と、蒸気タービンの蒸気入口に接続される主蒸気配管の途中に据え付けられ蒸気流路の開度を変化させる排気圧力制御弁と、蒸気タービンの蒸気出口からプロセスに供給するプロセス蒸気の圧力が所望の圧力値となるように排気圧力制御弁の開度を調節する調節計とを具備し、蒸気を蒸気タービンで減圧してプロセスに供給すると共に蒸気タービンの余剰出力を電力に変換するものである。   A process steam control device using a conventional steam turbine includes a steam turbine driven by steam, a generator connected to the steam turbine to generate electricity by converting mechanical energy into electric energy, and a steam inlet of the steam turbine. An exhaust pressure control valve installed in the middle of the connected main steam pipe and changing the opening of the steam flow path, and exhaust so that the pressure of the process steam supplied to the process from the steam outlet of the steam turbine becomes a desired pressure value And a controller for adjusting the opening degree of the pressure control valve. The pressure is reduced by the steam turbine and supplied to the process, and the surplus output of the steam turbine is converted into electric power.

上記従来の蒸気タービンを利用したプロセス蒸気の制御装置は、蒸気タービンの発電効率が低い値となってしまう問題があった。これは、主蒸気配管の途中に制御弁を据え付けているために、制御弁と蒸気タービンのノズルとの間での蒸気の圧力損失が大きく、そのため、蒸気タービンの入口から出口の熱落差が小さく、単位蒸気流量当たりの出力が小さなものとなってしまうためである。
特開平２−６１３０５号公報 The process steam control device using the conventional steam turbine has a problem that the power generation efficiency of the steam turbine is low. This is because the control valve is installed in the middle of the main steam pipe, so that the steam pressure loss between the control valve and the nozzle of the steam turbine is large. This is because the output per unit steam flow becomes small.
JP-A-2-61305

解決しようとする課題は、制御弁と蒸気タービンのノズルとの間での蒸気の圧力損失を小さくして蒸気タービンの発電効率を向上させることである。   The problem to be solved is to improve the power generation efficiency of the steam turbine by reducing the pressure loss of the steam between the control valve and the nozzle of the steam turbine.

本発明の特徴は、蒸気により駆動する蒸気タービンと、蒸気タービンに連結され機械エネルギーを電気エネルギーに変換して電気を発生する発電機と、蒸気タービンの蒸気入口とノズルとの間の蒸気流路の開度を変化させる制御弁と、蒸気タービンの蒸気出口からプロセスに供給するプロセス蒸気の状態を検出するセンサと、所望の設定値信号とセンサからの状態信号を比較してプロセス蒸気の状態が所望の設定値となるように制御弁の開度を調節する調節計とを具備し、制御弁は蒸気タービンの蒸気入口とノズルとの間の蒸気流路に設けられたケージと、ケージ内に設けられ蒸気流路の開度を変化させるプラグと、調節計からの制御信号により駆動されプラグの開度を制御する駆動部とを具備することを特徴とする蒸気タービンを利用したプロセス蒸気の制御装置にある。 The present invention is characterized by a steam turbine driven by steam, a generator connected to the steam turbine for generating electricity by converting mechanical energy into electrical energy, and a steam flow path between a steam inlet and a nozzle of the steam turbine A control valve for changing the opening degree of the engine, a sensor for detecting the state of the process steam supplied to the process from the steam outlet of the steam turbine, and comparing the desired set value signal and the state signal from the sensor to determine the state of the process steam. A controller for adjusting the opening of the control valve so as to obtain a desired set value , the control valve being provided in a steam flow path between the steam inlet of the steam turbine and the nozzle, and in the cage a plug to change the provided opening of the steam flow path, using a steam turbine, characterized by comprising a driving unit for controlling the opening of the drive plug by a control signal from the controller The control unit of the process steam.

本発明は、蒸気タービンの蒸気入口とノズルとの間に制御弁を設けることにより、制御弁と蒸気タービンのノズルとの間での蒸気の圧力損失を小さくできるので、蒸気タービンの発電効率を向上させることができるという優れた効果を生じる。また、蒸気タービンの蒸気入口とノズルとの間に制御弁を設けることにより、蒸気タービンの蒸気入口に接続される主蒸気配管の構造を簡略化できるという優れた効果を生じる。   In the present invention, by providing a control valve between the steam inlet of the steam turbine and the nozzle, the pressure loss of the steam between the control valve and the nozzle of the steam turbine can be reduced, thereby improving the power generation efficiency of the steam turbine. The excellent effect that it can be made is produced. Further, by providing a control valve between the steam inlet of the steam turbine and the nozzle, an excellent effect of simplifying the structure of the main steam pipe connected to the steam inlet of the steam turbine is produced.

本発明の蒸気タービンを利用したプロセス蒸気の制御装置は、蒸気タービンの蒸気入口とノズルとの間に制御弁を設けたものであるので、制御弁と蒸気タービンのノズルとの間を短くでき、制御弁と蒸気タービンのノズルとの間での蒸気の圧力損失が小さくなる。そのため、蒸気タービンの入口から出口で大きな熱落差が得られ、蒸気タービンの発電効率を向上させることができる。   Since the process steam control apparatus using the steam turbine of the present invention is provided with a control valve between the steam inlet of the steam turbine and the nozzle, the distance between the control valve and the nozzle of the steam turbine can be shortened, The pressure loss of steam between the control valve and the nozzle of the steam turbine is reduced. Therefore, a large heat drop is obtained from the inlet to the outlet of the steam turbine, and the power generation efficiency of the steam turbine can be improved.

上記の技術的手段の具体例を示す実施例を説明する（図１参照）。図１は本発明の蒸気タービンを利用したプロセス蒸気の制御装置の概略構成を示す図である。蒸気により駆動する蒸気タービン１の蒸気入口２に主蒸気配管３を接続して蒸気タービン１に高圧かつ高温の蒸気４を供給する。蒸気タービン１のロータブレード５に機械エネルギーを電気エネルギーに変換して電気を発生する誘導発電機６を機械的・動力的に連結する。蒸気タービン１の蒸気出口７にプロセス蒸気配管８を接続してプロセス蒸気９をプロセス１０に供給する。   An embodiment showing a specific example of the above technical means will be described (see FIG. 1). FIG. 1 is a diagram showing a schematic configuration of a process steam control apparatus using a steam turbine of the present invention. A main steam pipe 3 is connected to a steam inlet 2 of a steam turbine 1 driven by steam, and high-pressure and high-temperature steam 4 is supplied to the steam turbine 1. An induction generator 6 that generates electricity by converting mechanical energy into electrical energy is mechanically and dynamically connected to the rotor blade 5 of the steam turbine 1. A process steam pipe 8 is connected to the steam outlet 7 of the steam turbine 1 to supply process steam 9 to the process 10.

蒸気タービン１の蒸気入口２とノズル１１との間の蒸気流路１２に制御弁１３のケージ１４を設け、ケージ１４内に蒸気流路１２の開度を変化させる制御弁１３のプラグ１５を設ける。プラグ１５は調節計１６からの制御信号１７により駆動する制御弁１３の駆動部１８により開度制御される。プロセス蒸気配管８にプロセス蒸気９の圧力や温度や流量等の状態を検出するセンサ１９を設ける。センサ１９で検出されたプロセス蒸気９の状態信号２０を調節計１６に供給する。調節計１６はプロセス蒸気９の所望の設定値信号２１とセンサ１９からの状態信号２０を比較してプロセス蒸気９の状態が所望の設定値となるように制御弁１３の駆動部１８に制御信号１７を供給する。   A cage 14 for the control valve 13 is provided in the steam passage 12 between the steam inlet 2 of the steam turbine 1 and the nozzle 11, and a plug 15 for the control valve 13 for changing the opening degree of the steam passage 12 is provided in the cage 14. . The opening degree of the plug 15 is controlled by a drive unit 18 of a control valve 13 that is driven by a control signal 17 from the controller 16. A sensor 19 that detects the pressure, temperature, flow rate, and the like of the process steam 9 is provided in the process steam pipe 8. A state signal 20 of the process steam 9 detected by the sensor 19 is supplied to the controller 16. The controller 16 compares the desired set value signal 21 of the process steam 9 with the state signal 20 from the sensor 19, and controls the drive unit 18 of the control valve 13 so that the state of the process steam 9 becomes the desired set value. 17 is supplied.

主蒸気配管３から蒸気タービン１に供給される高圧かつ高温の蒸気は蒸気タービン１の蒸気入口２、蒸気流路１２、ノズル１１を通ってロータブレード５を回転させる。高圧かつ高温の蒸気はロータブレード５を回転させることにより、減圧かつ減温されプロセス蒸気９として蒸気出口７から流出し、プロセス蒸気配管８からプロセス１０に供給される。プロセス蒸気９の圧力や温度や流量等の状態がセンサ１９で検出され、検出された状態信号２０が調節計１６に供給される。調節計１６は供給された状態信号２０とプロセス蒸気９の所望の設定値信号２１を比較してプロセス蒸気９の状態が所望の設定値となるように制御弁１３の駆動部１８に制御信号１７を供給する。制御信号１７に基づいて制御弁１３が蒸気タービン１の蒸気流路１２の開度を変化させることにより、プロセス蒸気９の状態が所望の設定値に制御される。また、ロータブレード５の回転により誘導発電機６が定速駆動され、余剰出力が電力に変換される。   The high-pressure and high-temperature steam supplied from the main steam pipe 3 to the steam turbine 1 rotates the rotor blade 5 through the steam inlet 2, the steam flow path 12, and the nozzle 11 of the steam turbine 1. The high-pressure and high-temperature steam is depressurized and reduced in temperature by rotating the rotor blade 5, flows out from the steam outlet 7 as process steam 9, and is supplied to the process 10 from the process steam pipe 8. Conditions such as pressure, temperature, and flow rate of the process steam 9 are detected by the sensor 19, and the detected status signal 20 is supplied to the controller 16. The controller 16 compares the supplied state signal 20 with the desired set value signal 21 of the process steam 9 so that the control signal 17 is supplied to the drive unit 18 of the control valve 13 so that the state of the process steam 9 becomes a desired set value. Supply. The state of the process steam 9 is controlled to a desired set value by the control valve 13 changing the opening degree of the steam flow path 12 of the steam turbine 1 based on the control signal 17. Further, the induction generator 6 is driven at a constant speed by the rotation of the rotor blade 5, and the surplus output is converted into electric power.

本発明の蒸気タービンを利用したプロセス蒸気の制御装置の概略構成を示す図である。It is a figure which shows schematic structure of the control apparatus of the process steam using the steam turbine of this invention.

符号の説明Explanation of symbols

１ 蒸気タービン
２ 蒸気入口
３ 主蒸気配管
４ 蒸気
５ ロータブレード
６ 誘導発電機
７ 蒸気出口
８ プロセス蒸気配管
９ プロセス蒸気
１０ プロセス
１１ ノズル
１２ 蒸気流路
１３ 制御弁
１４ ケージ
１５ プラグ
１６ 調節計
１７ 制御信号
１８ 駆動部
１９ センサ
２０ 状態信号
２１ 設定値信号
DESCRIPTION OF SYMBOLS 1 Steam turbine 2 Steam inlet 3 Main steam piping 4 Steam 5 Rotor blade 6 Induction generator 7 Steam outlet 8 Process steam piping 9 Process steam 10 Process 11 Nozzle 12 Steam flow path 13 Control valve 14 Cage 15 Plug 16 Controller 17 Control signal 18 Drive unit 19 Sensor 20 Status signal 21 Set value signal

Claims (1)

蒸気により駆動する蒸気タービンと、蒸気タービンに連結され機械エネルギーを電気エネルギーに変換して電気を発生する発電機と、蒸気タービンの蒸気入口とノズルとの間の蒸気流路の開度を変化させる制御弁と、蒸気タービンの蒸気出口からプロセスに供給するプロセス蒸気の状態を検出するセンサと、所望の設定値信号とセンサからの状態信号を比較してプロセス蒸気の状態が所望の設定値となるように制御弁の開度を調節する調節計とを具備し、制御弁は蒸気タービンの蒸気入口とノズルとの間の蒸気流路に設けられたケージと、ケージ内に設けられ蒸気流路の開度を変化させるプラグと、調節計からの制御信号により駆動されプラグの開度を制御する駆動部とを具備することを特徴とする蒸気タービンを利用したプロセス蒸気の制御装置。 A steam turbine driven by steam, a generator connected to the steam turbine for generating electricity by converting mechanical energy into electric energy, and an opening degree of a steam flow path between a steam inlet and a nozzle of the steam turbine are changed. A control valve, a sensor for detecting the state of the process steam supplied to the process from the steam outlet of the steam turbine, and a desired set value signal are compared with the state signal from the sensor, and the state of the process steam becomes a desired set value. And a controller for adjusting the opening of the control valve, the control valve being a cage provided in the steam flow path between the steam inlet and the nozzle of the steam turbine, and a steam flow path provided in the cage. a plug for varying the opening degree control of process steam using a steam turbine, characterized by comprising a driving unit is driven to control the opening of the plug by a control signal from controller Apparatus.
JP2004091197A 2004-03-26 2004-03-26 Process steam control system using steam turbine Expired - Fee Related JP4633376B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6030402A (en) * 1983-07-28 1985-02-16 Toshiba Corp Steam control valve
JPS62195403A (en) * 1986-02-20 1987-08-28 Toshiba Corp Steam turbine
JPH0565808A (en) * 1991-09-04 1993-03-19 Fuji Electric Co Ltd Steam turbine plant supplying heat
JPH0617948A (en) * 1991-02-15 1994-01-25 Tlv Co Ltd Cage valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6030402A (en) * 1983-07-28 1985-02-16 Toshiba Corp Steam control valve
JPS62195403A (en) * 1986-02-20 1987-08-28 Toshiba Corp Steam turbine
JPH0617948A (en) * 1991-02-15 1994-01-25 Tlv Co Ltd Cage valve
JPH0565808A (en) * 1991-09-04 1993-03-19 Fuji Electric Co Ltd Steam turbine plant supplying heat

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