CN215808425U - Thermal power plant deaerator water level control device based on condensed water rotating speed adjustment - Google Patents
Thermal power plant deaerator water level control device based on condensed water rotating speed adjustment Download PDFInfo
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- CN215808425U CN215808425U CN202121603063.8U CN202121603063U CN215808425U CN 215808425 U CN215808425 U CN 215808425U CN 202121603063 U CN202121603063 U CN 202121603063U CN 215808425 U CN215808425 U CN 215808425U
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Abstract
The utility model discloses a thermal power plant deaerator water level control device based on condensed water rotation speed adjustment, which comprises an adjustable pressure reducing valve, wherein the inlet of the adjustable pressure reducing valve is connected with a water inlet pipeline, and the outlet of the adjustable pressure reducing valve is connected with a drift diameter adjusting valve; the inlet of the drift diameter regulating valve is connected with an adjustable pressure reducing valve; the outlet of the drift diameter regulating valve is connected with a water outlet pipeline; the pressure control system is arranged on a water inlet pipeline of the adjustable pressure reducing valve and a water inlet pipeline and a water outlet pipeline of the drift diameter regulating valve and is used for controlling the inlet pressure of the adjustable pressure reducing valve and the inlet pressure of the drift diameter regulating valve; the flow control system is arranged on a water inlet pipeline of the adjustable pressure reducing valve and used for controlling inlet flow of the adjustable pressure reducing valve and the drift diameter regulating valve. Under the working condition of large load, condensed water enters a condensed water system through an adjustable pressure reducing valve and a drift diameter adjusting valve, so that throttling loss caused by a reducing valve is eliminated; under the working condition of the condensate pump operating in a power frequency mode, the adjustable pressure reducing valve gives consideration to the parameters of the condensate main pipe and the parameters of the inlet of the drift diameter regulating valve, so that the parameters accord with the design range.
Description
Technical Field
The utility model belongs to the technical field of energy conservation of thermal power plants, and relates to a thermal power plant deaerator water level control device based on condensed water rotation speed adjustment.
Background
The water level control mode of the deaerator in most power plants at present adopts a method of combining a condensate pump rotating speed control flow and a deaerator water feeding regulating valve flow control mode, the condensate pump rotating speed is directly adopted to regulate and control the flow under a large-load working condition, the deaerator water feeding regulating valve throttling mode is adopted to control the flow under a low-load working condition, however, a reducing regulating valve is adopted to control the water level of the deaerator in any mode, according to the design mode of the existing system, the deaerator water feeding regulating valve adopts reducing, and the pipeline system in the deaerator water level control process can be increased along the way; the increase of the on-way resistance can lead to the increase of the power consumption rate of the condensate pump and the reduction of the unit economy. At present, most of deaerators of power plants adopt a reducing valve for a water level control regulating valve.
In order to further realize energy conservation and emission reduction, in most power plants, in order to solve the problem that the power consumption rate of the condensate pump is higher at low load, two means of regulating the rotating speed in a frequency conversion mode of the condensate pump and fully opening a water level regulating valve of a deaerator are adopted, so that the power consumption rate of the condensate pump is reduced. The most adoption undergauge of present oxygen-eliminating device water level control transfer valve is controlled, no matter condensate pump rotational speed changes or oxygen-eliminating device water level control valve opens and all can produce inevitable undergauge throttle loss, if simply change the latus rectum valve, then probably appear condensate header pressure low with the unsatisfied designing requirement's of latus rectum valve operating condition phenomenon. By adopting the novel control device for the water level of the deaerator, the throttling loss caused by the structure of the regulating valve can be avoided, the minimum running pressure of condensed water is ensured to be safe and controllable, the generating power of the unit is improved, the heat consumption rate of the steam turbine is reduced, and the running economy of the thermal power unit is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art and provides a thermal power plant deaerator water level control device based on condensed water rotating speed regulation.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
a thermal power plant deaerator water level control device based on condensate water rotational speed is adjusted includes:
the inlet of the adjustable pressure reducing valve is connected with a water inlet pipeline, and the outlet of the adjustable pressure reducing valve is connected with a drift diameter regulating valve;
the inlet of the drift diameter regulating valve is connected with an adjustable pressure reducing valve; the outlet of the drift diameter regulating valve is connected with a water outlet pipeline;
the pressure control system is arranged on a water inlet pipeline of the adjustable pressure reducing valve and a water inlet pipeline and a water outlet pipeline of the drift diameter regulating valve and is used for controlling the inlet pressure of the adjustable pressure reducing valve and the inlet pressure of the drift diameter regulating valve;
and the flow control system is arranged on a water inlet pipeline of the adjustable pressure reducing valve and used for controlling the inlet flow of the adjustable pressure reducing valve and the drift diameter regulating valve.
The utility model further improves the following steps:
the outlet of the water outlet pipeline is also connected with a low-pressure heater.
The pressure control system comprises a first pressure measuring device arranged on an inlet pipeline of the adjustable pressure reducing valve, a second pressure measuring device arranged on an inlet pipeline of the drift diameter regulating valve and a third pressure measuring device arranged on an outlet pipeline of the drift diameter regulating valve.
The first pressure measuring device is electrically connected with the first signal processor, and the first signal processor is electrically connected with the adjustable pressure reducing valve.
The second pressure measuring device and the third pressure measuring device are simultaneously electrically connected with the second signal processor, and the second signal processor is electrically connected with the adjustable pressure reducing valve.
The flow control system comprises a flow measuring device and a condensate pump rotating speed adjusting controller which are arranged on an inlet pipeline of the adjustable pressure reducing valve.
And the flow measuring device is connected with a third signal processor.
And the third signal processor is simultaneously electrically connected with the condensate pump rotating speed adjusting controller and the drift diameter adjusting valve.
Compared with the prior art, the utility model has the following beneficial effects:
under the working condition of large load, condensed water enters a condensed water system through an adjustable pressure reducing valve and a drift diameter adjusting valve, so that throttling loss caused by a reducing valve is eliminated; under the working condition of the condensate pump operating in a power frequency mode, the adjustable pressure reducing valve gives consideration to the parameters of the condensate main pipe and the parameters of the inlet of the drift diameter regulating valve, so that the parameters accord with the design range.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a novel control device for the water level of a deaerator in a thermal power plant based on a condensed water rotating speed adjusting technology, which is adopted by a coal-fired power plant in the embodiment of the utility model.
Wherein: 1-adjustable pressure reducing valve; 2-a drift diameter regulating valve; 3-a water inlet pipeline; 4-a water outlet pipeline; 5-a pressure control system; 6-a flow control system; 7-a low pressure heater; 8-a first signal processor; 9-a second signal processor; 10-a third signal processor; and 11-a condensed water pump rotating speed adjusting controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience and simplicity, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The utility model is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the embodiment of the utility model discloses a thermal power plant deaerator water level control device based on condensed water rotation speed adjustment, which comprises an adjustable pressure reducing valve 1; a drift diameter regulating valve 2; a water inlet pipe 3; a water outlet pipeline 4; a pressure control system 5; a flow control system 6; a low-pressure heater 7; a first signal processor 8; a second signal processor 9; a third signal processor 10; the condensate pump speed adjustment controller 11.
The condensate water is adjusted through the adjustable pressure reducing valve 1, the condensate water enters the drift diameter adjusting valve 2 after the pressure reducing valve, the throttle loss can be reduced to the maximum degree through the flow control device, and the condensate water enters the low-price heater 7 through the water outlet pipeline 4 and returns to the steam turbine condensate system.
The frequency conversion operation mode of the condensate pump is characterized in that the flow rate of condensate water is dynamically adjusted through a condensate pump rotating speed adjusting controller 11, the pressure of a condensate water main pipe is adjusted through an adjustable pressure reducing valve 1, the condensate water firstly flows through the adjustable pressure reducing valve 1 through a water inlet pipeline 3, then flows through a drift diameter adjusting valve 2, and reaches a low-pressure heater 7 through a water outlet pipeline 4. When the pressure of a condensed water main pipe at the inlet of the adjustable pressure reducing valve 1 is higher than the lowest allowable pressure, the condensed water reaches the adjustable pressure reducing valve 1 through the water inlet pipeline 3, and the adjustable pressure reducing valve 1 and the drift diameter regulating valve 2 are both fully opened, so that the condensed water pipeline is ensured to obtain the minimum on-way resistance to realize the energy-saving effect; when the pressure of the condensate header at the inlet of the adjustable pressure reducing valve 1 is lower than the lowest allowable pressure of the system, a condensate pressure signal is transmitted to the first signal processor 8, a corresponding adjusting instruction is generated and transmitted to the adjustable pressure reducing valve 1, and the condensate header pressure is adjusted by the adjustable pressure reducing valve 1 to meet the operation requirement. The requirement that the pressure of the condensate header is not lower than the lowest allowable pressure is met while the minimum throttling loss is achieved under the condition that the condensate pump operates in a variable frequency mode through the adjustment.
The industrial frequency operation mode of the condensate pump is characterized in that the flow rate of condensate water is jointly adjusted through an adjustable pressure reducing valve 1 and a drift diameter adjusting valve 2, the pressure difference of an inlet and an outlet of the drift diameter adjusting valve 2 is adjusted through the adjustable pressure reducing valve, and the condensate water firstly flows through the adjustable pressure reducing valve 1 through a water inlet pipeline 3, then flows through the drift diameter adjusting valve 2 and reaches a low-pressure heater 7 through a water outlet pipeline 4. If the difference value between the outlet pressure of the adjustable pressure reducing valve 1 and the outlet pressure of the drift diameter regulating valve 2 is smaller than the designed maximum allowable pressure difference, slowly opening the adjustable pressure reducing valve 1 until the pressure difference is equal to the designed maximum pressure difference of the drift diameter regulating valve 2, and adjusting the condensate flow through the drift diameter regulating valve 2 and meeting the operation requirement at the moment; if the difference value between the outlet pressure of the adjustable pressure reducing valve 1 and the outlet pressure of the drift diameter regulating valve 2 is larger than the designed maximum allowable pressure difference, the adjustable pressure reducing valve 1 is slowly closed until the pressure difference of the inlet and the outlet of the drift diameter regulating valve 2 is smaller than the designed maximum pressure difference, and at the moment, the condensate flow is adjusted through the drift diameter regulating valve 2 and meets the operation requirement. The control requirement that the pressure difference between the inlet and the outlet of the drift diameter regulating valve 2 is always within the design range is met while the minimum throttling loss is achieved under the condition that the industrial frequency operation mode of the condensate pump is met through the regulation.
The pressure control logic of the adjustable pressure reducing valve 1 is as follows: according to the first pressure measuring device 51, an inlet pressure signal P1 of the adjustable pressure reducing valve 1 is measured, and the inlet pressure signal P1 enters the first signal processor 8 for processing; a second pressure measuring device 52 for measuring an outlet pressure signal P2 of the adjustable pressure reducing valve 1, a third pressure measuring device 53 for measuring an outlet pressure signal P3 of the drift diameter regulating valve 3, and pressure signals P2 and P3 which enter a second signal processor 9 for processing; under the condensate pump frequency conversion operating mode: if the inlet pressure of the adjustable pressure reducing valve 1 is higher than the lowest allowable pressure of a condensed water system, the first signal processor 8 forms a valve opening instruction D1 which is transmitted to the adjustable pressure reducing valve 1 to control the opening of a valve; if the inlet pressure of the adjustable pressure reducing valve 1 is lower than the lowest allowable pressure of the condensed water system, the first signal processor 8 forms a valve closing instruction D2 which is transmitted to the adjustable pressure reducing valve 1 to control the valve to be closed. Under the condensate pump power frequency operation mode: if the pressure difference of the inlet and the outlet of the drift diameter regulating valve 2 is lower than the designed highest pressure difference, the adjustable pressure reducing valve 1 is gradually opened, and the second signal processor 9 forms a valve opening instruction D1 which is transmitted to the adjustable pressure reducing valve 1 to control the valve to be opened; if the pressure difference of the inlet and the outlet of the drift diameter regulating valve 2 is higher than the designed highest pressure difference, the adjustable pressure reducing valve 1 is gradually closed, and the second signal processor 9 forms a valve closing instruction D2 which is transmitted to the adjustable pressure reducing valve 1 to control the valve to be closed.
The flow control logics of the drift diameter regulating valve 2 and the condensate pump rotating speed regulating controller 11 are as follows: according to the flow measuring device 61, an inlet flow signal F1 of the adjustable pressure reducing valve 1 is measured, the inlet flow signal F1 enters a third signal processor 10 for processing, the third signal processor 10 simultaneously sends instructions to a condensate pump rotating speed adjusting controller 11 and a drift diameter adjusting valve 2, and under the frequency conversion operation mode of the condensate pump: if the inlet flow signal F1 is lower than the flow required by the system operation, the third signal processor 10 forms an increase flow instruction E1, which is transmitted to the condensate pump rotating speed adjusting controller 11 to control the rotating speed to increase so as to increase the flow; the inlet flow signal F1 is higher than the flow required for system operation, and the third signal processor 10 forms an increase flow command E12, which is transmitted to the condensate pump rotational speed adjustment controller 11 to control the rotational speed decrease so as to reduce the flow. Under the condensate pump power frequency operation mode: if the inlet flow signal F1 is lower than the flow required by the system operation, the third signal processor 10 forms an increase flow instruction E1, and transmits the increase flow instruction to the drift diameter regulating valve 2 to control the valve to be opened so as to increase the flow; the inlet flow signal F1 is higher than the flow required for system operation and the third signal processor 10 forms an increase flow command E12 which is transmitted to the drift diameter regulating valve 2 to control the valve to close and thereby reduce the flow.
In this embodiment, both can guarantee that condensate can obtain minimum throttling loss when the controlling means is flowed through to the condensate, can guarantee that condensate header pressure is higher than the system and allow minimum value simultaneously, under the prerequisite that guarantees condensate pump power consumption minimum, improve the security of unit.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a thermal power plant oxygen-eliminating device water level control device based on condensate water rotational speed adjusts which characterized in that includes:
the inlet of the adjustable pressure reducing valve (1) is connected with a water inlet pipeline (3), and the outlet of the adjustable pressure reducing valve (1) is connected with a drift diameter regulating valve (2);
the inlet of the drift diameter adjusting valve (2) is connected with an adjustable pressure reducing valve (1); the outlet of the drift diameter regulating valve (2) is connected with a water outlet pipeline (4);
the pressure control system (5) is arranged on a water inlet pipeline of the adjustable pressure reducing valve (1) and a water inlet pipeline and a water outlet pipeline of the drift diameter regulating valve (2) and is used for controlling inlet pressures of the adjustable pressure reducing valve (1) and the drift diameter regulating valve (2);
and the flow control system (6) is arranged on a water inlet pipeline of the adjustable pressure reducing valve (1) and is used for controlling the inlet flow of the adjustable pressure reducing valve (1) and the inlet flow of the drift diameter regulating valve (2).
2. The thermal power plant deaerator water level control device based on condensed water rotation speed adjustment is characterized in that the outlet of the water outlet pipeline (4) is also connected with a low-pressure heater (7).
3. The thermal power plant deaerator water level control device based on condensed water rotation speed regulation according to claim 1 or 2, characterized in that the pressure control system comprises a first pressure measuring device (51) arranged on an inlet pipeline of the adjustable pressure reducing valve (1), a second pressure measuring device (52) arranged on an inlet pipeline of the drift diameter regulating valve (2) and a third pressure measuring device (53) arranged on an outlet pipeline of the drift diameter regulating valve (2).
4. The thermal power plant deaerator water level control device based on condensed water rotation speed adjustment is characterized in that the first pressure measuring device (51) is electrically connected with the first signal processor (8), and the first signal processor (8) is electrically connected with the adjustable pressure reducing valve (1).
5. The thermal power plant deaerator water level control device based on condensed water rotation speed adjustment is characterized in that the second pressure measuring device (52) and the third pressure measuring device (53) are simultaneously electrically connected with the second signal processor (9), and the second signal processor (9) is electrically connected with the adjustable pressure reducing valve (1).
6. The thermal power plant deaerator water level control device based on condensed water rotation speed adjustment is characterized in that the second pressure measuring device (52) and the third pressure measuring device (53) are simultaneously electrically connected with the second signal processor (9), and the second signal processor (9) is electrically connected with the adjustable pressure reducing valve (1).
7. The thermal power plant deaerator water level control device based on condensed water rotation speed regulation of claim 1 or 2, characterized in that the flow control system comprises a flow measuring device (61) and a condensed water pump rotation speed regulation controller (11) arranged on an inlet pipeline of the adjustable pressure reducing valve (1).
8. The thermal power plant deaerator water level control apparatus based on condensed water rotation speed regulation of claim 7, characterized in that a third signal processor (10) is connected to the flow measuring device (61).
9. The thermal power plant deaerator water level control device based on condensed water rotation speed regulation of claim 8, characterized in that the third signal processor (10) is electrically connected with the condensed water pump rotation speed regulation controller (11) and the drift diameter regulation valve (2) at the same time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121603063.8U CN215808425U (en) | 2021-07-14 | 2021-07-14 | Thermal power plant deaerator water level control device based on condensed water rotating speed adjustment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121603063.8U CN215808425U (en) | 2021-07-14 | 2021-07-14 | Thermal power plant deaerator water level control device based on condensed water rotating speed adjustment |
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| CN215808425U true CN215808425U (en) | 2022-02-11 |
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| CN202121603063.8U Active CN215808425U (en) | 2021-07-14 | 2021-07-14 | Thermal power plant deaerator water level control device based on condensed water rotating speed adjustment |
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- 2021-07-14 CN CN202121603063.8U patent/CN215808425U/en active Active
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