JPH06123203A - Turbine power generation control device - Google Patents

Abstract

PURPOSE:To regulate a steam amount with good accuracy by providing a flow meter and a bypass regulator in a bypass piping provided on a steam main piping in parallel, regulating a governor according to pressure in a steam reservoir, and regulating main and auxiliary bypass flow meters so as to reduce temperature and pressure. CONSTITUTION:Steam is supplied from a steam reservoir 1 through a main piping 5, an inlet flow amount detector 6, and a governor 7, and a steam turbine is driven so as to condense 12 steam. A bypass piping 4 is separated into two system, main and auxiliary and a temperature and pressure are reduced 11 through main and auxiliary bypass flow meters 9A, 9B and main and auxiliary bypass regulators 10A and 10B so as to condense 12 steam. Pressure in the steam reservoir 1 is detected 2, and the governor 7 is regulated by output of the inlet flow amount detector 6, in a pressure regulator 3. Respective opening degree of the main and auxiliary bypass regulators 10A, 10B are regulated by the main and auxiliary bypass flow meters 9A, 9B through main and auxiliary flow amount regulators 13A and 13B, in the regulator 3. It is thus possible to control the steam amount with high accuracy at the time of normal and abnormal operations so as to utilize steam effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbine power generation control device having a boiler facility.

[0002]

2. Description of the Related Art Conventionally, steam generated from a boiler is sent to a steam turbine via a steam reservoir and to a temperature reduction / decompression device via a bypass line to be condensed by a condenser. Then, it is composed of a steam sump pressure and a governor obtained from a pressure detector and a pressure controller controlled by a turbine bypass control valve so that the steam sump pressure set value is obtained. Then, during power generation, steam is effectively used for power generation at the very limit of the line of possible power generation, and at the time of line over, it is condensed as surplus steam via the bypass line.

[0003]

It is necessary to generate electric power by steam without exceeding the limit of the possible power generation line. For that purpose, it is necessary to measure the bypass flow rate with high accuracy and adjust the flow rate regardless of the power generation / total bypass state.

An object of the present invention is to provide a turbine power generation control device which measures a bypass flow rate with high accuracy and adjusts the flow rate so as to generate power at the limit of a possible power generation line.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a steam main pipe for supplying main steam from a steam reservoir to a steam turbine, and a main steam which is provided in a system of the steam main pipe and is supplied to an inlet of the steam turbine. An inlet flow rate detector for measuring the flow rate, a governor connected in series with the inlet flow rate detector to adjust the main steam flow rate supplied to the steam turbine, and an inlet flow rate detector and a main series consisting of the governor and steam turbine. An equipment circuit, a bypass pipe branching from the steam main pipe to form a bypass circuit, a main bypass flow meter connected to this bypass pipe to measure a large steam flow rate, and a pipe in series with this main bypass flow meter The main bypass controller, which is connected and regulates a large steam flow rate, and the auxiliary bypass flow meter, which is connected in parallel with the main bypass flow meter to measure a small steam flow rate, A supplementary bypass control valve connected in series with the bypass flow meter to regulate a small steam flow, a supplementary series circuit consisting of this supplementary bypass control valve and supplementary bypass flow meter, and a main series consisting of the main bypass control valve and main bypass flow meter. Bypass parallel device circuit in which the circuits are connected in parallel with each other, a temperature reducing and decompressing device that is connected in series with the bypass parallel device circuit to reduce the temperature and pressure of the bypass steam, and a pressure detector that detects the pressure of the steam reservoir And a pressure regulator that outputs a governor opening signal to the governor according to the pressure signal from this pressure detector and the inlet flow signal from the inlet flow detector, and the pressure adjustment signal from this pressure regulator and the main bypass flow meter. The main bypass flow controller that outputs the main bypass control valve opening signal to the main bypass control valve according to the main bypass flow signal of A turbine power generation control device comprising comprising an auxiliary bypass flow rate adjusting meter for outputting a complement bypass control valve position signal to the auxiliary bypass control valve, a by complement bypass flow rate signal from the integer signal and the auxiliary bypass flowmeter.

[0006]

In the turbine power generation control device of the present invention, main steam is supplied from the steam reservoir to the steam turbine, and an inlet flow rate detector is provided in the system of the steam main piping to supply the main steam at the inlet of the steam turbine. The governor is connected in series with the inlet flow detector, the main steam flow rate supplied to the steam turbine is adjusted, the inlet flow detector, the governor and the steam turbine are connected in main series A bypass circuit is provided by branching to form a bypass circuit, a main bypass flow meter is connected to the bypass pipe to measure a large steam flow, and a main bypass controller is connected in series with the main bypass flow meter to connect a large bypass flow meter. Adjust the steam flow rate, connect the auxiliary bypass flow meter in parallel with the main bypass flow meter to measure a small steam flow rate, and connect the auxiliary bypass control valve in series with the auxiliary bypass flow meter. A small series of steam is regulated, the auxiliary series circuit consisting of the auxiliary bypass control valve and the auxiliary bypass flow meter and the main series circuit consisting of the main bypass control valve and the main bypass flow meter are connected in parallel with each other, and in series with the bypass parallel equipment circuit. The temperature and pressure of the bypass steam is reduced by connecting a decompression / decompression device to the pipe to detect the pressure of the steam reservoir, and the governor opening degree is determined by the pressure signal from the pressure detector and the inlet flow rate signal from the inlet flow rate detector. A signal is output, the main bypass control valve opening signal is output to the main bypass control valve by the pressure control signal from the pressure controller and the main bypass flow signal from the main bypass flow meter, and the pressure control signal and the auxiliary bypass flow meter are output. An auxiliary bypass control valve opening signal is output to the auxiliary bypass control valve in accordance with the auxiliary bypass flow signal.

[0007]

EXAMPLE An example of the present invention will be described below. In FIG. 1, 5 is a steam main pipe for supplying main steam from the steam reservoir 1 to the steam turbine 8, and 6 is a system provided in the system of the steam main pipe 5 and measures the flow rate of the main steam supplied to the inlet of the steam turbine 8. An inlet flow rate detector, 7 is a governor connected in series with the inlet flow rate detector 6 to adjust the main steam flow rate supplied to the steam turbine 8, and 4 is a branch circuit provided from the steam main pipe 5 to form a bypass circuit. The main bypass flow meter 9A is connected to the bypass pipe 4 to measure a large steam flow rate, and the main bypass flow meter 10A is connected to the main bypass flow meter 9A in series to adjust a large steam flow rate, 9B. Is a supplementary bypass flow meter which is connected in parallel with the main bypass flow meter 9A to measure a small steam flow rate, and 10B is connected in series with the auxiliary bypass flow meter 9B to adjust a small steam flow rate. Complementary bypass control valve, 11 is connected in series with a bypass parallel device circuit in series, and is a temperature reducing / pressure reducing device for lowering the temperature and pressure of bypass steam. 2 is a pressure detector for detecting the pressure of the steam reservoir 1. 3 is pressure detection. A pressure regulator that outputs a governor opening signal to the governor 7 in response to a pressure signal from the device 2 and an inlet flow signal from the inlet flow detector 6.
3A is a main bypass flow controller that outputs a main bypass control valve opening signal to the main bypass control valve 10A in response to the pressure control signal from the pressure controller 3 and the main bypass flow signal from the main bypass flow meter 9A, and 13B is the pressure control. It is a supplementary bypass flow controller that outputs a supplementary bypass control valve opening signal to the supplementary bypass control valve 10B in response to a signal and a supplemental bypass flow signal from the supplementary bypass flow meter 9B.
It is a turbine-capable power generation control device for the purpose of obtaining a highly efficient power generation amount by accurately calculating the surplus steam amount and effectively using the steam in a plant that condenses the excess steam amount such as steam turbine power generation equipment. .

That is, in order to measure the bypass flow rate with high accuracy, the bypass line is divided into two systems, and the main bypass flow meter 9A for the large range, the main bypass control valve 10A, and the auxiliary bypass for the small range are provided for each. A flow meter 9B and an auxiliary bypass control valve are installed to measure the flow rate in a steady / unsteady state. Further, the primary bypass flow rate adjustment is performed in a steady state by the auxiliary bypass flow rate controller 13B configured by the auxiliary bypass flow rate control valve 10B and the flow rate value obtained by the auxiliary bypass 9B. The secondary bypass flow rate adjustment is performed in a non-steady state by the flow rate value obtained by the flow rate meter 9A and the main bypass flow rate controller 13A composed of the main bypass control valve 10A.

In FIG. 1, the steam accumulated in the steam sump 1 flows to a steam turbine 8 or a bypass line. This steam is first effectively utilized by the pressure control valve 3 in the possible power generation line of the steam turbine 8, and at the time of line over, the auxiliary bypass flow controller 13B which operates the auxiliary bypass control valve 10B so that the steam reservoir pressure becomes constant. Further, the main bypass flow rate controller 13A, which operates the main bypass control valve 10A so that the pressure becomes secondarily constant, performs turbine bypass control forming a closed loop.

The steam supplied from the boiler is sent to the steam turbine 8 via the steam sump 1. In addition, when the amount of power generation is exceeded / when the total amount is bypassed (during non-steady state), it is sent to the bypass line and condensed.

From the auxiliary bypass flow meter 9B, the steam pressure obtained from the pressure detector 2 and the pressure regulator 3 constituted by the governor 7 are adjusted to the set value from the pressure regulator 3 so that the set value is obtained. A supplementary bypass flow rate controller 13B configured by the obtained bypass flow rate (small range) and a supplementary bypass control valve (child valve) 10B, and a bypass flow rate (large range) also obtained from the main bypass flow meter 9A and a total bypass control valve. It is composed of a main bypass flow rate controller 13A composed of (large valve) 10A.

As long as the power generation amount pressure is allowed to reach the high-pressure steam sump pressure target value, the pressure controller 3 operates the governor to generate power, and if it exceeds, the bypass flow rate determined by the pressure controller 3 is exceeded. When the auxiliary bypass flow rate controller 13B operates the slave valve to flow the steam to the bypass line so as to reach the target value, and if the target value is still not followed, the main bypass flow rate controller 13A operates the large valve,
Constant pressure control is performed so that steam is further released to the bypass line.

As described above, by providing the small range / large range measurement flow meter, the slave valve / main valve, and the flow controller for adjusting the same, the pressure is controlled at a constant line limit of the possible power generation capacity of the steam turbine. Will be possible, and that will lead to effective use of steam.

[0014]

According to the present invention, the bypass flow rate can be measured and adjusted with high accuracy even in the steady / unsteady flow rate span, and the precise bypass flow rate control can be realized.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a turbine power generation control device showing an embodiment of the present invention.

[Explanation of symbols]

 2 Pressure detector 3 Pressure controller 6 Inlet flow detector 9A Main bypass flow meter 10A Main bypass control valve 13A Main bypass flow controller

Claims (1)

[Claims] 1. A steam main pipe for supplying main steam from a steam reservoir to a steam turbine, and an inlet flow rate detection for measuring a flow rate of main steam provided in a system of the steam main pipe and supplied to an inlet of the steam turbine. And a governor connected in series with the inlet flow rate detector to control the main steam flow rate to be supplied to the steam turbine, and a main series device circuit including the inlet flow rate detector, the governor and the steam turbine. A bypass pipe branching from the steam main pipe to form a bypass circuit, a main bypass flow meter connected to the bypass pipe to measure a large steam flow rate, and a main bypass flow meter connected in series to the bypass pipe. A main bypass controller for adjusting the large steam flow rate, and a supplementary bypass flow meter for connecting the main bypass flow meter in parallel and measuring a small steam flow rate. An auxiliary bypass control valve connected in series with the auxiliary bypass flow meter to control the small steam flow rate; a complementary series circuit including the auxiliary bypass control valve and the auxiliary bypass flow meter; the main bypass control valve; A bypass parallel equipment circuit in which main series circuits composed of bypass flow meters are connected in parallel with each other, a temperature reduction pressure reducing device for reducing the temperature and pressure of bypass steam connected in series with the bypass parallel equipment circuit, and the vapor reservoir A pressure detector for detecting the pressure of, a pressure controller for outputting a governor opening signal to the governor according to a pressure signal from the pressure detector and an inlet flow signal from the inlet flow detector, and from this pressure regulator Of the main bypass control valve and the main bypass flow signal from the main bypass flow meter to the main bypass control valve opening degree. A main bypass flow controller that outputs a signal, and a supplementary bypass flow controller that outputs a supplementary bypass control valve opening signal to the supplementary bypass control valve according to the pressure adjustment signal and the supplemental bypass flow signal from the supplementary bypass flow meter. A turbine power generation control device comprising: