CN114215730B - Control method for realizing automatic frequency conversion of condensate pump of large-scale thermal power plant - Google Patents
Control method for realizing automatic frequency conversion of condensate pump of large-scale thermal power plant Download PDFInfo
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- CN114215730B CN114215730B CN202111331265.6A CN202111331265A CN114215730B CN 114215730 B CN114215730 B CN 114215730B CN 202111331265 A CN202111331265 A CN 202111331265A CN 114215730 B CN114215730 B CN 114215730B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 11
- 230000033228 biological regulation Effects 0.000 claims abstract description 25
- 238000010977 unit operation Methods 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 230000007423 decrease Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 description 7
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 206010063385 Intellectualisation Diseases 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000001363 water suppression through gradient tailored excitation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a control method for realizing automatic frequency conversion of a condensate pump of a large-scale thermal power plant, which comprises a unit operation automatic control mode and a unit start-stop control mode; corresponding critical values are set for the unit load, the low side pressure valve opening and the low side temperature reducing valve opening of the thermal power unit, the actual measured data are compared with the set critical values by detecting the unit load, the low side pressure valve opening and the low side temperature reducing valve opening when the thermal power unit operates, and the unit start-stop control mode or the peak regulation mode is automatically switched into according to the comparison result, so that the rotating speed of the high-voltage frequency converter of the condensate pump is driven to execute according to the corresponding modes.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a control method for realizing automatic frequency conversion of a condensate pump of a large-scale thermal power plant.
Background
Along with the increasing of peak-valley difference of power load and the large-scale access of random and intermittent renewable energy sources, the power system has higher requirements on the peak regulation capability of the thermal power unit, the technical research on the deep peak regulation of the thermal power unit, the peak regulation capability of the thermal power unit is improved, the power grid requirements are met, and the economic and environmental protection of the thermal power unit are improved.
At present, the deep peak shaving technology is limited specially aiming at 50% rated load and below of the thermal power generating unit, and peak shaving is usually carried out by adopting a measure of starting and stopping. In the start-up and stop states of the unit, the outlet pressure of the condensate pump needs to be high enough, namely, the rotating speed of the condensate pump high-voltage frequency converter gradually rises along with the load decrease, so that the initial hot water, the steam-water mixture, saturated steam and superheated steam with insufficient superheat degree are discharged; however, in the unit peak regulation state, the load is reduced without increasing the outlet pressure of the condensate pump, and the current method uniformly treats the unit peak regulation and start-stop machine, so that the blind bias of the power consumption of the condensate pump high-voltage frequency converter is caused, and the energy conservation, emission reduction and intelligent production requirements are not facilitated.
Disclosure of Invention
The invention aims at solving the problems existing in the prior art, and provides a control method for realizing automatic frequency conversion of a condensate pump of a large-scale thermal power plant, which is used for intelligently switching a unit operation automatic control mode and a unit start-stop control mode according to the operation condition of a unit, and realizing the functions of energy conservation, consumption reduction and intellectualization by automatically adjusting the rotation speed of the condensate pump, namely the outlet pressure of the condensate pump, which is automatically adapted.
The technical effects to be achieved by the invention are realized by the following technical scheme:
A control method for realizing automatic frequency conversion of a condensate pump of a large-scale thermal power plant comprises a unit operation automatic control mode and a unit start-stop control mode; the automatic operation control mode is applied to the condition of supercritical load of the thermal power generating unit, and the rotating speed of the high-voltage frequency converter of the condensate pump is adjusted in a sectional mode according to the outlet pressure curve of the condensate pump; the unit start-stop control mode is applied to the condition of starting and stopping the thermal power unit, the rotating speed of the high-voltage frequency converter of the condensate pump is gradually increased along with the decrease of the load, so that superheated steam in the unit is discharged when the thermal power unit is started and stopped, corresponding critical values are set for the unit load, the low side pressure regulating valve opening and the low side temperature reducing water regulating valve opening of the thermal power unit, the actual measured data are compared with the set critical values by detecting the unit load, the low side pressure regulating valve opening and the low side temperature reducing water regulating valve opening of the thermal power unit, and the rotating speed of the high-voltage frequency converter of the condensate pump is automatically switched into the operation automatic control mode, the unit start-stop control mode or the peak regulating mode according to the comparison result, so that the rotating speed of the condensate pump is driven to be executed according to the corresponding modes.
Preferably, the critical value of the unit load is set to be 50% of rated load, the critical value of the opening degree of the low side pressure water regulating valve is set to be 5%, and the critical value of the opening degree of the low side temperature reducing water regulating valve is set to be 50%; when the unit load is more than 50% of rated load, entering the automatic control mode; when the unit load is less than 50% of rated load and the low side pressure valve opening is more than 10% or the low side temperature reducing water valve opening is more than 50%, entering a unit start-stop control mode; when the unit load is less than 50% of rated load and the opening of the low side pressure regulating valve is less than or equal to 10% or the opening of the low side temperature reducing water regulating valve is less than or equal to 50%, the peak regulating mode is entered.
Preferably, the unit load is 300MW.
Preferably, the peak shaving mode is used for reducing the rotating speed of the high-voltage frequency converter of the condensate pump so as to reduce the outlet pressure of the condensate pump to a specified value.
Preferably, in the peak shaving mode, the outlet pressure of the coagulation pump needs to be reduced to 1.4MPa, and the unit load corresponding to the outlet pressure is 0-300MW.
Preferably, the unit start-stop control mode is used for increasing the rotation speed of the high-voltage frequency converter of the condensate pump when the thermal power unit is started or stopped so as to increase the outlet pressure of the condensate pump to a specified value, thereby discharging the superheated steam in the unit.
Preferably, in the unit start-stop control mode, the outlet pressure of the coagulation pump needs to be raised to 2.0MPa.
Compared with the prior art, the invention has the beneficial effects that:
The method is mainly applied to the deep peak regulation and start-stop operation of 50% rated load and below of the thermal power generating unit, the condition of the thermal power generating unit under 50% rated load and below is found out through identifying the operation condition of the thermal power generating unit, judging conditions are set for the low side pressure gate opening and the low side temperature reduction water gate opening, the deep peak regulation or start-stop mode is intelligently switched according to judging results, the deep peak regulation and the start-stop operation are distinguished, the rotating speed of the condensate pump is correspondingly controlled in different modes, and accordingly the outlet pressure of the condensate pump is generated. The method of the invention is used for separately processing according to the requirements of deep peak regulation and start-stop, so that the condition of energy loss caused by overlarge outlet pressure of the condensate pump during peak regulation is avoided, and the energy saving, consumption reduction and intellectualization functions are realized by an intelligent regulation method.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a workflow diagram of the present invention;
Table 1 shows pump outlet pressure-load piecewise functions above 300MW employed in the automatic control mode of operation;
table 2 shows the pump outlet pressure-load piecewise function of 0-600MW used in the unit start-stop control mode;
Table 3 shows the pump outlet pressure-load piecewise functions of 0-600MW for peak shaving mode;
table 4 is a comparison of condensate pump electrical performance and outlet pressure before and after the individual peak shaving mode;
table 5 shows the comparison of the power consumption of the condensate pump before and after the individual peak shaving mode.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment provides a control method for realizing automatic frequency conversion of a condensate pump of a large-scale thermal power plant, which is applied to a 600 MW-level supercritical thermal power plant condensate pump high-voltage frequency conversion control system.
Firstly, the embodiment measures the load of the unit so as to judge whether the unit enters the automatic control mode of unit operation or the start-stop control mode/peak regulation mode of the unit.
Specifically, the automatic control mode of operation is applied to the condition that the load of the thermal power generating unit exceeds 50%, when the load of the thermal power generating unit is more than 300MW, the automatic control mode of operation realizes the sectional adjustment of the rotating speed of the high-pressure frequency converter of the condensate pump according to the outlet pressure curve of the condensate pump, and the pressure-load sectional function of the condensate pump with the pressure of more than 300MW is shown in the following table 1:
TABLE 1
When the load of the unit is less than or equal to 300MW, the control system enters a unit start-stop control mode/peak regulation mode, and as to the specific start-stop operation or peak regulation operation, the method sets a judgment condition for the control mode, wherein the judgment condition is to measure and feed back the opening of the low side pressure regulating valve or the opening of the low side temperature reducing water regulating valve so as to identify the real requirement of the unit, and then control the rotating speed of the high-voltage frequency converter so as to achieve different outlet pressures.
Specifically, when the unit load is less than 300MW and the low side pressure valve opening is more than 10% or the low side temperature reducing water valve opening is more than 50%, the unit is judged to be in a starting and stopping state, and the system enters a unit starting and stopping control mode.
The unit start-stop control mode is applied to the condition of starting and stopping the thermal power unit, and the initial hot water, the steam-water mixture, saturated steam and superheated steam with insufficient superheat degree are required to be discharged when the thermal power unit is started and stopped, so that a large amount of condensation water is required to be consumed. In the unit start-stop control mode, the rotating speed of the high-pressure frequency converter of the condensate pump gradually rises along with the decrease of the load, and the rotating speed of the high-pressure frequency converter of the condensate pump determines the outlet pressure of the condensate pump, so that sufficient condensate can be generated. In this embodiment, the unit start-stop control mode drives the rotation speed of the condensate pump to rise, and the outlet pressure of the condensate pump rises accordingly, specifically, the outlet pressure of the condensate pump is increased to 2MPa by automatically increasing the bias at a rate of 0.1MPa/s, and when the outlet pressure rises to 2MPa, the unit load gradually decreases, and finally gradually decreases to 0.
In this example, the pump outlet pressure head pressure below 300MW is 2MPa, i.e., 300MW load corresponds to 1.4MPa pressure, 250MW to 0MW load corresponds to 2MPa pressure, and 0-600MW pump outlet pressure-load piecewise function is shown in Table 2 below:
TABLE 2
When the load of the unit is less than 300MW and the opening of the low side pressure regulating valve is less than or equal to 10% or the opening of the low side temperature reducing water regulating valve is less than or equal to 50%, the unit is judged to be in a peak regulating state, and the system enters a peak regulating mode.
The peak regulation mode is used for reducing the rotating speed of the high-voltage frequency converter of the condensate pump so as to reduce the outlet pressure of the condensate pump to a specified value. In this embodiment, the peak regulation mode needs to reduce the outlet pressure of the coagulation pump to 1.4MPa at a rate of 0.06MPa/s, and the peak regulation mode is not disturbed to be switched to an operation automatic control mode, and the unit load corresponding to the outlet pressure of 1.4MPa is 0-300 MW.
The peak shaver pattern employs a pump outlet pressure-load piecewise function as shown in Table 3 below:
TABLE 3 Table 3
The control method sets corresponding critical values for the unit load, the low side pressure valve opening and the low side temperature reducing water valve opening of the thermal power unit, compares actual measured data with the set critical values by detecting the unit load, the low side pressure valve opening and the low side temperature reducing water valve opening when the thermal power unit operates, and automatically switches into the operation automatic control mode, the unit start-stop control mode or the peak regulation mode according to the comparison result to drive the rotation speed of the high-pressure frequency converter of the condensate pump to execute according to the corresponding modes.
Especially in the peak regulation mode, the control method optimizes the original design that the pressure gradually rises along with the load drop (the top pressure is 2.1 MPa) to automatically adjust the rotation speed of the condensate pump so as to keep the outlet pressure of the condensate pump at 1.4MPa, and the condensate amount corresponding to the outlet pressure value not only meets the total demand of a temperature reduction water system, but also greatly reduces the electric energy loss of the high-voltage frequency converter, thereby realizing two functions of energy saving, consumption reduction and intelligent adjustment.
In order to verify the effectiveness of the invention in saving the power consumption of the condensate pump, the electric performance and the outlet pressure are compared with the original common mode of starting and stopping of the unit and peak regulation and the single peak regulation mode provided by the invention, and technical data collected on site are shown in table 4:
TABLE 4 Table 4
As can be seen from the data results in table 4, after the start-stop mode and the peak shaving mode are automatically switched, the power consumption of the condensate pump is significantly reduced, and the total demand of the temperature reduction water system is satisfied, and the peak shaving effect is also achieved.
Further, we compare the power consumption of the condensate pump before and after setting the peak shaving mode, the unit is started and stopped and peak shaving shares a set of mode before transformation, the peak shaving mode is set independently after transformation, and the power consumption difference before and after transformation is shown in table 5:
TABLE 5
As can be seen from the data in Table 5, compared with the conventional mode of starting and stopping by means of the method for realizing peak regulation after identifying and switching into the peak regulation mode, the method can save electric quantity 26.38 kW.h, and the average power saving rate reaches 29.6%.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (3)
1. A control method for realizing automatic frequency conversion of a condensate pump of a large-scale thermal power plant comprises a unit operation automatic control mode and a unit start-stop control mode; the automatic operation control mode is applied to the condition of supercritical load of the thermal power generating unit, and the rotating speed of the high-voltage frequency converter of the condensate pump is adjusted in a sectional mode according to the outlet pressure curve of the condensate pump; the unit start-stop control mode is applied to the condition of starting and stopping the thermal power unit, the rotating speed of a high-voltage frequency converter of a condensate pump is gradually increased along with the decrease of load, so that superheated steam in the unit is discharged during starting and stopping the thermal power unit;
The critical value of the unit load is set to be 50% of rated load, the critical value of the opening of the low side pressure regulating valve is set to be 5%, and the critical value of the opening of the low side temperature reducing water regulating valve is set to be 50%; when the unit load is more than 50% of rated load, entering the automatic control mode; when the unit load is less than 50% of rated load and the low side pressure valve opening is more than 10% or the low side temperature reducing water valve opening is more than 50%, entering a unit start-stop control mode; when the unit load is less than 50% of rated load and the opening of the low side pressure regulating valve is less than or equal to 10% or the opening of the low side temperature reducing water regulating valve is less than or equal to 50%, entering the peak regulating mode;
The unit load is 300MW, the peak regulation mode is used for reducing the rotating speed of the high-voltage frequency converter of the condensate pump so as to reduce the outlet pressure of the condensate pump to a specified value, and the unit start-stop control mode is used for increasing the rotating speed of the high-voltage frequency converter of the condensate pump when the thermal power unit is started or stopped so as to increase the outlet pressure of the condensate pump to the specified value, so that superheated steam in the unit is discharged.
2. The control method for realizing automatic frequency conversion of a condensate pump of a large-scale thermal power plant according to claim 1, wherein in the peak shaving mode, the outlet pressure of the condensate pump is required to be reduced to 1.4MPa.
3. The control method for realizing automatic frequency conversion of a condensate pump of a large-scale thermal power plant according to claim 1, wherein in the unit start-stop control mode, the outlet pressure of the condensate pump is required to be increased to 2.0MPa.
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