CN110805477A - Control method and control system for water feeding pump steam turbine - Google Patents
Control method and control system for water feeding pump steam turbine Download PDFInfo
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- CN110805477A CN110805477A CN201811635307.3A CN201811635307A CN110805477A CN 110805477 A CN110805477 A CN 110805477A CN 201811635307 A CN201811635307 A CN 201811635307A CN 110805477 A CN110805477 A CN 110805477A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/01—Purpose of the control system
- F05D2270/02—Purpose of the control system to control rotational speed (n)
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Abstract
The invention discloses a control method of a water feeding pump steam turbine, which comprises the steps that an S1 controller increases a servo valve instruction according to the deviation of the target rotating speed and the actual rotating speed of the steam turbine to control the opening of a low-pressure side regulating valve; the method comprises the following steps that S2 a pressure transmitter detects a steam inlet pressure parameter at the low-pressure side of a water supply pump steam turbine and transmits the determined steam inlet pressure parameter at the low-pressure side of the steam turbine to a controller; and the S3 controller judges whether the low-pressure side inlet steam pressure is matched with the target revolution of the steam turbine according to the low-pressure side inlet steam pressure parameter of the steam turbine from the pressure transmitter, and controls the high-pressure side throttle to be opened to enable the low-pressure side inlet steam pressure to be matched with the target revolution of the steam turbine after judging that the low-pressure side inlet steam pressure is not matched with the target revolution of the steam turbine, so that the revolution of the water feeding pump steam turbine is stabilized at the target revolution. Correspondingly, a feedwater pump steam turbine control system is also disclosed. The control of the invention is closer to the actual situation, and when the working condition changes, the high-pressure side regulating valve and the low-pressure side regulating valve of the water supply pump steam turbine respond quickly, thereby improving the response capability of the rotating speed.
Description
Technical Field
The invention relates to the technical field of water feeding pump turbines, in particular to a control method and a control system of a water feeding pump turbine.
Background
In recent years, with the rapid development of global economy, the total energy consumption is rising year after year, energy conservation and consumption reduction are at the forefront, a water feeding pump is dragged by an industrial steam turbine (a small steam turbine for short) for a thermal power plant, energy conversion links are reduced, steam extraction is used as a steam source, low-level utilization of energy is achieved, the energy utilization rate is improved, the industrial steam turbine operates at a variable rotating speed according to load requirements, the water feeding amount is not adjusted by throttling of a throttle, a large amount of throttling loss is avoided, and the method is more and more widely applied to thermal power plants.
The small steam turbine that thermal power plant is often used for dragging the feed pump is single cylinder, impulse, straight formula, many steam sources formula steam turbine that congeals, and high pressure side steam source is cold section reheat steam, and the low pressure steam source is four sections steam extractions and auxiliary steam, and two way low pressure steam sources are outer for trading, and be interior switching between high, the low pressure steam source, through high low pressure side combined action, realize feed pump rotational speed control, and then control boiler feedwater flow is in order to satisfy the needs of the different operating modes of unit.
At present, when the high-pressure side governor is involved in adjusting the rotation speed of the water feeding pump turbine, the high-pressure side governor is started according to a preset fixed overlapping degree, namely, the high-pressure side governor is controlled according to the opening degree of the low-pressure side governor, for example, when the opening degree of the low-pressure side governor is greater than N (generally, 60% to 95%, slightly different due to equipment differences), the high-pressure side governor is opened again. In the control mode, the situation that the pressure of a high-pressure side is higher than that of a low-pressure side can occur, when the high-pressure side regulating valve greatly causes the pressure in front of the low-pressure regulating valve to rise suddenly and is higher than the steam supply pressure of the low-pressure side, the phenomenon of steam robbery of the high-pressure side and the low-pressure side can occur, when the rotating speed of a steam turbine of the water supply pump is slightly deviated from the set value, the fluctuation of the water supply quantity is large, and when the rotating speed is serious, the vibration of the water supply pump is aggravated to cause; also can lead to high pressure side transfer door to open and have one section "idle stroke" before setting up improperly because of the overlap degree, lead to the feed pump steam turbine rotational speed to descend unusually, all can threaten unit safety operation seriously.
Disclosure of Invention
The main object of the present invention is to provide a control method and a control system for a feed pump turbine, which adjust the low-pressure side inlet steam pressure of the feed pump turbine so that the feed pump turbine operates at a stable target rotational speed.
The invention discloses a control method of a water feeding pump steam turbine, which comprises the following steps:
s1, when the rotating speed of the water feeding pump turbine needs to be increased, the controller sends an increasing servo valve instruction to control the opening of the low-pressure side regulating valve according to the deviation between the target rotating speed and the actual rotating speed of the water feeding pump turbine;
s2, the pressure transmitter detects the low-pressure side steam inlet pressure parameter of the water pump turbine according to the steam from the front sampling hole of the main valve at the low-pressure side of the water pump turbine, and transmits the determined low-pressure side steam inlet pressure parameter of the turbine to the controller;
and S3, the controller judges whether the low-pressure side inlet steam pressure is matched with the target revolution of the steam turbine according to the low-pressure side inlet steam pressure parameter of the steam turbine from the pressure transmitter, and controls the high-pressure side throttle to open to enable the low-pressure side inlet steam pressure to be matched with the target revolution of the steam turbine after judging that the low-pressure side inlet steam pressure is not matched with the target revolution of the steam turbine, so that the revolution of the water feeding pump steam turbine is stabilized at the target revolution.
Preferably, the step S3 includes:
s31, determining the target inlet pressure of the low-pressure side corresponding to the target rotating speed of the steam turbine by the controller;
s32, the controller compares the current steam inlet pressure of the low pressure side of the steam turbine from the pressure transmitter with the target steam inlet pressure of the low pressure side;
s33, if the current steam inlet pressure of the low-pressure side of the steam turbine is larger than the target steam inlet pressure, the controller controls the high-pressure side servo valve to close the high-pressure side regulating valve until the current steam inlet pressure measured by the low-pressure side of the water supply pump steam turbine reaches the target steam inlet pressure;
s34, if the current steam inlet pressure of the low-pressure side of the steam turbine is smaller than the target steam inlet pressure, the controller controls the high-pressure side servo valve to open the high-pressure side throttle valve to be large until the current steam inlet pressure measured by the low-pressure side of the water supply pump steam turbine reaches the target steam inlet pressure.
Correspondingly, the invention also discloses a control system of the feed pump steam turbine, wherein a sampling hole is arranged on a front pipeline of the main valve at the low-pressure side of the feed pump steam turbine, the sampling hole is communicated with a pressure transmitter of the control system through a sampling pipe, and the control system comprises:
one end of the pressure transmitter is connected with the controller, and the other end of the pressure transmitter is communicated with a sampling hole of a front pipeline of a main valve at the low-pressure side of the steam turbine through a sampling pipe and is used for detecting a steam pressure parameter at the low-pressure side of the water feeding pump steam turbine according to steam from the sampling hole at the low-pressure side of the water feeding pump steam turbine and transmitting the determined steam pressure parameter at the low-pressure side of the steam turbine to the controller;
the low-pressure side servo valve is arranged in a regulating loop of the low-pressure side regulating valve of the water feeding pump steam turbine, is electrically connected with the controller and is used for regulating the opening of the low-pressure side regulating valve of the steam turbine according to a control command of the controller;
the high-pressure side servo valve is arranged in a regulating loop of a high-pressure side regulating valve of the water feeding pump steam turbine, is electrically connected with the controller and is used for regulating the opening of the high-pressure side regulating valve of the steam turbine according to a control command of the controller;
the controller is used for sending an increasing servo valve instruction to control the low-pressure side servo valve to open the low-pressure side throttle valve greatly according to the deviation between the target rotating speed and the actual rotating speed of the steam turbine when the rotating speed of the steam turbine needs to be increased; and judging whether the low-pressure side inlet steam pressure is matched with the target revolution of the steam turbine or not according to the low-pressure side inlet steam pressure parameter of the steam turbine from the pressure transmitter, and controlling the high-pressure side servo valve to adjust the opening degree of the high-pressure side regulating valve to enable the low-pressure side inlet steam pressure to be adaptive to the target revolution of the steam turbine after judging that the low-pressure side inlet steam pressure is not matched with the target revolution of the steam turbine, so that the revolution of the water feeding pump steam turbine.
Preferably, the controller controls the high-pressure side servo valve to adjust the opening of the high-pressure side throttle valve to the low-pressure side inlet steam pressure to adapt to the target rotating speed of the steam turbine, and the specific process of stabilizing the rotating speed of the water feeding pump steam turbine at the target rotating speed comprises the following steps:
the controller determines a target low-pressure side steam inlet pressure corresponding to the target rotating speed of the water feeding pump turbine, compares the current steam inlet pressure of the low-pressure side of the turbine from the pressure transmitter with the target low-pressure side steam inlet pressure, controls the high-pressure side servo valve to close the high-pressure side throttle valve if the current steam inlet pressure of the low-pressure side of the turbine is larger than the target steam inlet pressure, and controls the high-pressure side servo valve to open the high-pressure side throttle valve if the current steam inlet pressure of the low-pressure side of the turbine is smaller than the target steam inlet pressure.
Preferably, the method comprises the following steps:
correspondingly, the invention also discloses a controller of the control system of the feed water pump turbine, which comprises one or more processors:
when the rotating speed of a steam turbine of the water feeding pump needs to be increased, the opening of a low-pressure side regulating valve is controlled by increasing a servo valve instruction according to the deviation of the target rotating speed and the actual rotating speed of the steam turbine;
and judging whether the low-pressure side inlet steam pressure is matched with the target revolution of the steam turbine or not according to the low-pressure side inlet steam pressure parameter of the steam turbine from the pressure transmitter, and controlling the high-pressure side regulating valve to be opened until the low-pressure side inlet steam pressure is matched with the target revolution of the steam turbine after judging that the low-pressure side inlet steam pressure is not matched with the target revolution of the steam turbine, so that the revolution of the water feeding pump steam turbine is stabilized at the target.
Preferably, the control of the high-pressure side regulating valve to open makes the low-pressure side inlet steam pressure adapt to the target rotating speed of the steam turbine, so that the rotating speed of the water feeding pump steam turbine is stabilized at the target rotating speed, and the control method specifically comprises the following steps:
determining the target inlet pressure of the low-pressure side corresponding to the target rotating speed of the water pump steam turbine;
and comparing the current steam inlet pressure of the low pressure side of the steam turbine from the pressure transmitter with the target steam inlet pressure of the low pressure side, controlling the high pressure side regulating valve to be closed to be small if the current steam inlet pressure of the low pressure side of the steam turbine is greater than the target steam inlet pressure, and controlling the high pressure side regulating valve to be opened to be large if the current steam inlet pressure of the low pressure side of the steam turbine is less than the target steam inlet pressure.
The control method implemented by the invention determines whether the low-pressure side pressure can meet the requirement of the rotating speed of the steam turbine by detecting the pressure of the low-pressure side of the steam turbine of the water feeding pump, and maintains the stability of the low-pressure side pressure by adjusting the opening of the high-pressure side throttle (namely adjusting the high-pressure side pressure) under the condition that the low-pressure side pressure is insufficient, so that the water feeding pump can stably rotate at the target rotating speed, the service life of the water feeding pump is prolonged, and the water feeding efficiency is improved. Therefore, the adjustment between the low-pressure side and the high-pressure side regulating valve is realized according to the real-time working condition, and the stability of the rotating speed of the steam turbine is realized. Meanwhile, the phenomenon of 'steam robbery' on the high-low pressure side caused by controlling the high-pressure side regulating valve by presetting the opening degree of the low-pressure side regulating valve (for example, when the low-pressure side regulating valve is opened to 60% -95%, the high-pressure side regulating valve is opened again) is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a feedwater pump turbine system incorporating a feedwater pump turbine control system according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of a feedwater pump turbine control system of the present invention;
FIG. 3 is a schematic flow chart diagram of one embodiment of a feedwater pump turbine control method of the present invention;
fig. 4 is a schematic diagram showing a relationship between the number of revolutions and the low-pressure side intake steam pressure of a feed water pump turbine to which a feed water pump turbine control method of the present invention is applied.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the diagram is a schematic diagram of a feed pump steam turbine system based on a control system of a feed pump steam turbine of the present invention, and includes a low pressure side regulating gate 1, a high pressure side regulating gate 2, and a pressure measuring point 3 before the low pressure side regulating gate, wherein a pressure measuring point (sampling hole) is added before the low pressure side regulating gate, and the pressure measuring point is connected to an MEH (feed pump steam turbine control system). In the feed pump steam turbine control system, the passing pressure detection point is used for detecting a low-pressure steam inlet pressure parameter and carrying out closed-loop control on a high-pressure side regulating valve so as to maintain the front pressure of the low-pressure side regulating valve; and regulating the rotating speed of the steam turbine by closed-loop control on the low-pressure side regulating valve. The control system controls the high-low pressure side regulating valve of the water feeding pump steam turbine, so that the high-low pressure side regulating valve respectively takes the duties of the high-low pressure side regulating valve, the rotating speed (target rotating speed) of the water feeding pump required by the unit is maintained together, the power shortage of the low pressure side can be timely compensated, and the phenomenon of steam robbery caused by excessive input of the high pressure side is avoided.
Referring to FIG. 2, there is shown a schematic diagram of an embodiment of a control system for a feedwater pump turbine of the present invention, the system comprising: the system comprises a pressure transmitter 10, a low-pressure side servo valve 20, a high-pressure side servo valve 30, a controller 40 and a rotating speed sensor 50, wherein one end of the pressure transmitter is communicated with a sampling hole of a front pipeline of a main valve at the low-pressure side of the steam turbine through a sampling pipe, and the other end of the pressure transmitter is connected with the controller through an IO bayonet; one end of the low-pressure side servo valve 20 is connected with the low-pressure side regulating valve, and the other end is connected with the controller; one end of the high pressure side servo valve 30 is connected to the high pressure side regulator, and the other end is connected to the controller.
The pressure transmitter 10 detects a low-pressure side steam inlet pressure parameter of the water feeding pump turbine according to steam from a low-pressure side sampling hole of the water feeding pump turbine, and transmits the determined low-pressure side steam inlet pressure parameter of the turbine to the controller.
And the low-pressure side servo valve 20 is arranged in a regulating loop of the low-pressure side regulating valve of the water feeding pump turbine and is used for regulating the opening of the low-pressure side regulating valve of the turbine according to a control command of the controller.
And the high-pressure side servo valve 30 is arranged in a regulating loop of the high-pressure side regulating valve of the water feeding pump turbine and is used for regulating the opening of the high-pressure side regulating valve of the turbine according to a control command of the controller.
And a controller 40 for controlling the entire system. In particular, the steam turbine is operated at a target rotation number by controlling the steam pressure, and the water feed pump is driven to a target water feed amount. Therefore, when the rotating speed of the steam turbine needs to be increased, the controller increases the servo valve command according to the deviation of the target rotating speed and the actual rotating speed of the steam turbine to control the low-pressure side servo valve to open the low-pressure side throttle; and according to the pressure parameter of the low-pressure side inlet steam of the steam turbine from the pressure transmitter, controlling the opening degree of the high-pressure side servo valve to maintain the pressure of the low-pressure side inlet steam to be stable, so that the water feeding pump steam turbine can operate at a stable target rotating speed.
And the rotating speed sensor 50 is used for acquiring the rotating speed of the water feeding pump turbine and transmitting the rotating speed to the controller.
The control method in the embodiment of the present invention is explained in detail below. In this embodiment, a method for controlling a water pump turbine will be described by taking a case where the rotational speed of the water pump turbine needs to be increased as an example. Referring to fig. 3, there is shown a schematic flow chart of a control method of a feedwater pump turbine according to the present invention, the flow chart including the steps of:
step s1, the controller sends an increasing servo valve instruction to control the opening of the low-pressure side regulating valve according to the deviation of the target rotating speed and the actual rotating speed of the steam turbine; during specific implementation, the rotating speed sensor acquires the rotating speed of the water feeding pump turbine and sends the rotating speed to the controller, and the controller compares the current actual rotating speed and the target rotating speed of the water feeding pump turbine to determine the deviation of the current actual rotating speed and the target rotating speed.
Step S2, the pressure transmitter detects the low-pressure side steam inlet pressure parameter of the water pump turbine according to the steam from the front sampling hole of the main valve at the low-pressure side of the water pump turbine, and transmits the determined low-pressure side steam inlet pressure parameter of the turbine to the controller;
step S3, the controller receives the steam turbine low pressure side inlet steam pressure parameter from the pressure transmitter,
step S4, judging whether the low-pressure side inlet steam pressure is matched with the target revolution number of the steam turbine, if so, executing step S5, otherwise, executing step S6;
step s5, judging that the current low-pressure side inlet steam pressure of the water feeding pump turbine can enable the turbine to reach the target rotating speed;
and step s6, controlling the high-pressure side regulating valve to open so that the low-pressure side steam inlet pressure is adapted to the target rotating speed of the steam turbine, and stabilizing the rotating speed of the water feeding pump steam turbine at the target rotating speed.
In a specific implementation, step s6 includes:
step s61, the controller determines a target low-pressure side inlet pressure corresponding to the target turbine speed;
step S62, the controller compares the current steam inlet pressure of the low pressure side of the steam turbine from the pressure transmitter with the target steam inlet pressure of the low pressure side, if the current steam inlet pressure of the low pressure side of the steam turbine is larger than the target steam inlet pressure, the step S63 is executed, and if the current steam inlet pressure of the low pressure side of the steam turbine is smaller than the target steam inlet pressure, the step S64 is executed;
the method of automatically adjusting the front pressure of the main valve at the low pressure side through the high pressure side adjusting valve supplements the deficiency of the steam parameters at the low pressure side, maintains the power source required by the current working condition of the water feeding pump turbine, and further maintains the current rotating speed of the turbine for the water feeding pump.
Step S63, the controller controls the high-pressure side servo valve to close the high-pressure side control valve, and in the concrete implementation, the high-pressure side control valve is continuously closed, and at the same time, the pressure parameter of the low-pressure side changes, when the actual pressure of the low-pressure side reaches the target pressure of the low-pressure side, the adjustment of the high-pressure side servo valve is stopped, when the low-pressure side reaches the target pressure, that is, when the water supply pump turbine reaches the target rotation speed, in the concrete implementation, the target pressure may be an actual deviation value from the target pressure in consideration of the actual operation condition.
Step S64, the controller controls the high-pressure side servo valve to open the high-pressure side throttle to a large extent, the large degree of opening the high-pressure side throttle is also determined according to the target pressure of the low-pressure side, that is, when the current pressure of the low-pressure side reaches the preset target pressure, the adjustment of the high-pressure side throttle can be stopped, so as to maintain the stability of the low-pressure side throttle and avoid the occurrence of the high-pressure side steam robbery.
In addition, the invention also discloses a controller of the control system of the water supply pump turbine, which comprises one or more processors and is used for: when the rotating speed of a steam turbine of the water feeding pump needs to be increased, the opening of a low-pressure side regulating valve is controlled by increasing a servo valve instruction according to the deviation of the target rotating speed and the actual rotating speed of the steam turbine;
and judging whether the low-pressure side inlet steam pressure is matched with the target revolution of the steam turbine or not according to the low-pressure side inlet steam pressure parameter of the steam turbine from the pressure transmitter, and controlling the high-pressure side regulating valve to open to enable the low-pressure side inlet steam pressure to be matched with the target revolution of the steam turbine after judging that the low-pressure side inlet steam pressure is not matched with the target revolution of the steam turbine, so that the revolution of the water feeding pump steam turbine is stabilized at the. Wherein, control high pressure side governing valve opens and makes low pressure side admission steam pressure suit with the target rotational speed of steam turbine, makes the process at the target rotational speed of feed pump steam turbine rotational speed stability, specifically includes:
determining the target inlet pressure of the low-pressure side corresponding to the target rotating speed of the water pump steam turbine;
and comparing the current steam inlet pressure of the low pressure side of the steam turbine from the pressure transmitter with the target steam inlet pressure of the low pressure side, controlling the high pressure side regulating valve to be closed to be small if the current steam inlet pressure of the low pressure side of the steam turbine is greater than the target steam inlet pressure, and controlling the high pressure side regulating valve to be opened to be large if the current steam inlet pressure of the low pressure side of the steam turbine is less than the target steam inlet pressure.
The embodiment of the invention automatically maintains the pressure before the low-pressure regulating valve through the high-pressure side regulating valve, and when the embodiment is specifically realized, the target pressure at the low-pressure side can be reflected as the target pressure at the low-pressure side under the normal working condition, and the control point when the high-pressure side is started can be a set value which is slightly higher than the front pressure of a main valve at the low-pressure side (the target steam inlet pressure at the low-pressure side) under the normal working condition, so that the intervention regulation of the high-pressure side regulating valve is not performed according to the preset and fixed overlapping degree any more, but the front pressure of the low-pressure regulating valve is automatically regulated according to the operating working condition, when the pressure is low, namely the steam parameter at the low-pressure side is lower, the rotating speed of a small steam turbine is not enough to maintain; when the pressure is high, namely the steam parameter of the low-pressure side is higher, the rotating speed of the small steam turbine can be maintained by closing the high-pressure side regulating valve.
Compared with the traditional control method which is only based on the preset and fixed overlapping degree, the control method for avoiding the steam robbing of the high-pressure side and the low-pressure side of the water-feeding pump steam turbine provided by the embodiment of the invention considers all normal operation working conditions of the small steam turbine from the impact to the full load and also considers the reasonable intervention of the high-pressure side throttle when the low-pressure side pressure is insufficient, can timely compensate the situation of the low-pressure side power insufficiency by automatically maintaining the front pressure of the main steam valve of the low-pressure side through the high-pressure throttle, can avoid the steam robbing phenomenon caused by the excessive input of the high-pressure side, is more practical in calculation, has small disturbance quantity of the rotating speed of the small steam turbine when the working conditions are changed, and improves the load response capability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A control method for a steam turbine of a feed water pump is characterized by comprising the following steps:
s1, when the rotating speed of the water feeding pump turbine needs to be increased, the controller sends an increasing servo valve instruction to control the opening of the low-pressure side regulating valve according to the deviation between the target rotating speed and the actual rotating speed of the water feeding pump turbine;
s2, the pressure transmitter detects the low-pressure side steam inlet pressure parameter of the water pump turbine according to the steam from the front sampling hole of the main valve at the low-pressure side of the water pump turbine, and transmits the determined low-pressure side steam inlet pressure parameter of the turbine to the controller;
and S3, the controller judges whether the low-pressure side inlet steam pressure is matched with the target revolution of the steam turbine according to the low-pressure side inlet steam pressure parameter of the steam turbine from the pressure transmitter, and controls the high-pressure side throttle to open to enable the low-pressure side inlet steam pressure to be matched with the target revolution of the steam turbine after judging that the low-pressure side inlet steam pressure is not matched with the target revolution of the steam turbine, so that the revolution of the water feeding pump steam turbine is stabilized at the target revolution.
2. The feedwater pump turbine control method of claim 1, wherein the feedwater pump turbine control method comprises
Step S3 includes:
s31, determining the target inlet pressure of the low-pressure side corresponding to the target rotating speed of the steam turbine by the controller;
s32, the controller compares the current steam inlet pressure of the low pressure side of the steam turbine from the pressure transmitter with the target steam inlet pressure of the low pressure side;
s33, if the current steam inlet pressure of the low-pressure side of the steam turbine is larger than the target steam inlet pressure, the controller controls the high-pressure side servo valve to close the high-pressure side regulating valve until the current steam inlet pressure measured by the low-pressure side of the water supply pump steam turbine reaches the target steam inlet pressure;
s34, if the current steam inlet pressure of the low-pressure side of the steam turbine is smaller than the target steam inlet pressure, the controller controls the high-pressure side servo valve to open the high-pressure side throttle valve to be large until the current steam inlet pressure measured by the low-pressure side of the water supply pump steam turbine reaches the target steam inlet pressure.
3. A control system for a feed pump turbine, characterized in that the feed pump turbine is low
The pipeline is provided with the thief hole before the main throttle of pressure side, the thief hole passes through the pressure transmitter intercommunication of sampling tube and control system, control system includes: one end of the pressure transmitter is connected with the controller, and the other end of the pressure transmitter is communicated with a sampling hole of a front pipeline of a main valve at the low-pressure side of the steam turbine through a sampling pipe and is used for detecting a steam pressure parameter at the low-pressure side of the water feeding pump steam turbine according to steam from the sampling hole at the low-pressure side of the water feeding pump steam turbine and transmitting the determined steam pressure parameter at the low-pressure side of the steam turbine to the controller;
the low-pressure side servo valve is arranged in a regulating loop of the low-pressure side regulating valve of the water feeding pump steam turbine, is electrically connected with the controller and is used for regulating the opening of the low-pressure side regulating valve of the steam turbine according to a control command of the controller;
the high-pressure side servo valve is arranged in a regulating loop of a high-pressure side regulating valve of the water feeding pump steam turbine, is electrically connected with the controller and is used for regulating the opening of the high-pressure side regulating valve of the steam turbine according to a control command of the controller;
the controller is used for sending an increasing servo valve instruction to control the low-pressure side servo valve to open the low-pressure side throttle valve greatly according to the deviation between the target rotating speed and the actual rotating speed of the steam turbine when the rotating speed of the steam turbine needs to be increased; and judging whether the low-pressure side inlet steam pressure is matched with the target revolution of the steam turbine or not according to the low-pressure side inlet steam pressure parameter of the steam turbine from the pressure transmitter, and controlling the high-pressure side servo valve to adjust the opening degree of the high-pressure side regulating valve to enable the low-pressure side inlet steam pressure to be adaptive to the target revolution of the steam turbine after judging that the low-pressure side inlet steam pressure is not matched with the target revolution of the steam turbine, so that the revolution of the water feeding pump steam turbine.
4. The feedwater pump turbine control system of claim 3, wherein said system comprises
The controller controls the high-pressure side servo valve to adjust the opening degree of the high-pressure side regulating valve so that the low-pressure side steam inlet pressure is adaptive to the target rotating speed of the steam turbine, and the specific process of stabilizing the rotating speed of the water feeding pump steam turbine at the target rotating speed is as follows:
the controller determines a target low-pressure side steam inlet pressure corresponding to the target rotating speed of the water feeding pump turbine, compares the current steam inlet pressure of the low-pressure side of the turbine from the pressure transmitter with the target low-pressure side steam inlet pressure, controls the high-pressure side servo valve to close the high-pressure side throttle valve if the current steam inlet pressure of the low-pressure side of the turbine is larger than the target steam inlet pressure, and controls the high-pressure side servo valve to open the high-pressure side throttle valve if the current steam inlet pressure of the low-pressure side of the turbine is smaller than the target steam inlet pressure.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112282867A (en) * | 2020-10-15 | 2021-01-29 | 华能重庆珞璜发电有限责任公司 | Method for solving EH oil pipeline vibration caused by primary frequency modulation of steam turbine |
| CN115387863A (en) * | 2022-08-26 | 2022-11-25 | 西安热工研究院有限公司 | BEST small steam turbine steam admission governing valve control system based on automatic undisturbed switching of multiplex condition |
| CN114576149B (en) * | 2022-01-28 | 2023-11-28 | 华电电力科学研究院有限公司 | Optimal operation control system and method for circulating water pump of thermal power plant |
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| CN112282867A (en) * | 2020-10-15 | 2021-01-29 | 华能重庆珞璜发电有限责任公司 | Method for solving EH oil pipeline vibration caused by primary frequency modulation of steam turbine |
| CN112282867B (en) * | 2020-10-15 | 2023-06-27 | 华能重庆珞璜发电有限责任公司 | Method for solving problem of vibration of EH oil pipeline caused by primary frequency modulation of steam turbine |
| CN114576149B (en) * | 2022-01-28 | 2023-11-28 | 华电电力科学研究院有限公司 | Optimal operation control system and method for circulating water pump of thermal power plant |
| CN115387863A (en) * | 2022-08-26 | 2022-11-25 | 西安热工研究院有限公司 | BEST small steam turbine steam admission governing valve control system based on automatic undisturbed switching of multiplex condition |
| CN115387863B (en) * | 2022-08-26 | 2024-05-07 | 西安热工研究院有限公司 | BEST small steam turbine inlet valve control system based on multi-working-condition automatic undisturbed switching |
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