CN111810256B - Steam turbine cold start early warning system, method, storage medium and electronic equipment - Google Patents
Steam turbine cold start early warning system, method, storage medium and electronic equipment Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
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Abstract
The invention relates to the technical field of cold start of a steam turbine, in particular to a cold start early warning system, a cold start early warning method, a storage medium and electronic equipment of the steam turbine, and solves the problems that the system adopted by the existing steam turbine in the prior art is low in intelligent and differentiation degree and has no targeted early warning method and measure. The system comprises: the system comprises a parameter acquisition module for acquiring real-time parameters in the cold starting process of the steam turbine, a database module for storing simulation parameter thresholds, similar unit parameter thresholds and operation requirement parameter thresholds, a judging module for comparing the real-time parameters with the three parameter thresholds of the database module and outputting comparison results, a warning module for warning and prompting normal or abnormal according to the comparison results, and a suggestion module for parameter setting suggestion when prompting abnormal; the system is used for parameter monitoring and setting suggestion of the cold starting process of the steam turbine, and achieves the effects of shortening the cold starting time of the steam turbine, being more intelligent and having differentiation.
Description
Technical Field
The invention relates to the technical field of cold start of steam turbines, in particular to a cold start early warning system and method of a steam turbine, a storage medium and electronic equipment.
Background
Along with the rapid development of the power industry in China, the intelligent control technology is gradually applied to the starting, running and maintenance of power plant equipment. The steam turbine is used as main equipment of modern thermal power plant and is a rotary steam power device for converting steam heat energy into mechanical work. When the steam turbine is stopped for a period of time and reaches the ambient temperature, the steam turbine is started again, so that various preparation works before cold start are needed, and then the steam turbine can be started normally.
In the cold starting process of the steam turbine, whether the medium pressure cylinder is started or the high and medium pressure cylinders are started in a combined mode, the cold starting process is influenced by parameters such as expansion difference and temperature of the steam turbine generator unit, and the parameters also influence the safety, reliability and service life of the steam turbine. How to shorten the cold start time of the steam turbine brings greater economic benefit is a great difficulty in the technical field of steam turbine start.
At present, most of turbine units of power plants adopt a DCS system, various data can be accurately acquired in real time through a computer technology, a signal processing technology and a network technology, and protection warning and protection tripping instructions are correctly sent out, so that centralized operation, management and control and decentralized control in the operation of the turbine are realized. Under the control system, if a power plant operator starts the steam turbine, only required parameters are recorded, and according to the starting operation requirements of a steam turbine manufacturer, the parameters are correspondingly controlled and operated, so that the control system is really convenient to record compared with the traditional manual detection and handsheet. However, as the specific operation conditions of the power plants are different greatly, the starting operation requirements given by manufacturers are wider, and the data collected by the control system comprise all data of the whole operation process of the steam turbine, the data size is larger, and the like, the existing DCS system adopted by the current power plant turbine unit has the following problems:
1. Because the specific running conditions of the power plants are greatly different, the parameter setting is required to be manually carried out or whether the parameter setting is reasonable or not is manually judged after the system alarms, the requirement on operators is high, and human errors are easy to cause;
2. The operating parameter requirements of the manufacturers are relatively wide, the differentiation is lacking, the manual judgment is carried out only by depending on the starting operating parameter requirements given by the manufacturers of the steam turbines, and the starting time of the steam turbines can be increased due to the fact that the parameter requirements of most manufacturers are focused on the stable starting of the steam turbines, so that the economic benefit of the power plant is influenced;
3. early warning corresponding to key indexes or measures which can be taken cannot be fed back or prompted to operators, and misoperation situations can exist for operators with less experience;
4. the data volume that the system gathered is big, lacks pertinence, does not have corresponding parameter setting suggestion or method yet.
Therefore, the invention aims at the problems and provides a more intelligent, more automatic and more differentiated early warning system and method based on DCS, which can shorten the cold start time of a steam turbine, a storage medium and electronic equipment.
Disclosure of Invention
Aiming at the problems, the invention provides a cold start early warning system, a cold start early warning method, a cold start early warning storage medium and electronic equipment for a steam turbine, solves the problems that the existing system adopted by the steam turbine is low in intelligent degree and differentiation degree and has no targeted early warning method and measure, and achieves the purposes of shortening the cold start time, being more intelligent and having differentiation.
In order to achieve the above object, in a first aspect, the present invention provides a cold start early warning system for a steam turbine, including:
The parameter acquisition module is used for acquiring real-time parameters in the cold starting process of the steam turbine;
the database module is used for storing the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold;
the judging module is connected with the parameter acquisition module and the database module, and is used for comparing the real-time parameter with three parameter thresholds of the database module at the same time, judging whether the real-time parameter is in the range of a simulation parameter threshold, a similar unit parameter threshold and an operation requirement parameter threshold, and outputting three groups of comparison results;
The warning module is connected with the judging module and used for warning and prompting according to the three groups of comparison results, and prompting that the real-time parameters are normal or abnormal in the range of the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold respectively; and
And the suggestion module is connected with the warning module and the database module and is used for prompting the real-time parameter to correspondingly carry out parameter setting suggestion when the real-time parameter is abnormal in at least one threshold range of the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold.
According to an embodiment of the present invention, optionally, in the foregoing steam turbine cold start early warning system, the method further includes:
and the input module is connected with the database module and is used for inputting the operation requirement parameter threshold value into the database module according to the actual operation requirement of the power plant.
According to an embodiment of the present invention, optionally, in the foregoing steam turbine cold start early warning system, the method further includes:
and the display terminal is connected with the warning module and the suggestion module and is used for displaying real-time parameters, warning prompt information and parameter setting suggestions.
According to an embodiment of the present invention, optionally, in the foregoing steam turbine cold start early warning system, the real-time parameter includes at least one of expansion difference, temperature, pressure and rotational speed.
According to an embodiment of the present invention, optionally, in the foregoing steam turbine cold start early warning system, the parameter collecting module includes:
collecting a high-pressure cylinder expansion difference sub-module, a medium-pressure cylinder expansion difference sub-module and a low-pressure cylinder expansion difference sub-module of expansion difference,
A high pressure cylinder temperature sub-module, a medium pressure cylinder temperature sub-module, a main steam valve temperature sub-module and a regulating valve temperature sub-module for collecting temperature,
Condenser vacuum pressure sub-module for collecting pressure, and
And a rotor rotating speed sub-module for collecting rotating speed.
According to an embodiment of the present invention, optionally, in the foregoing steam turbine cold start early warning system, the database module includes:
The acquisition parameter storage sub-module is used for storing the real-time parameter data acquired by the parameter acquisition module, so that the later-period tracing is convenient;
The simulation parameter threshold submodule is used for storing a simulation parameter threshold value calculated by a turbine manufacturer according to a finite element model when the turbine is started in a cold state;
The similar unit parameter threshold submodule is used for storing similar unit parameter thresholds of the same type of unit when the turbine manufacturer researches the same type of unit in cold starting of other power plants;
And the operation requirement parameter threshold value sub-module is used for storing the operation requirement parameter threshold value set by an operator through the input module.
According to an embodiment of the present invention, optionally, in the foregoing steam turbine cold start early warning system, the parameter setting advice includes increasing or decreasing a main steam flow, increasing or decreasing a main steam temperature, increasing or decreasing a condenser vacuum pressure, and increasing or decreasing a rotor rotation speed.
In a second aspect, the invention provides a steam turbine cold start early warning method based on the steam turbine cold start early warning system, which comprises the following steps:
Calculating a parameter threshold setting simulation parameter threshold when the steam turbine is started in a cold state according to the finite element model by a steam turbine manufacturer, setting a similar unit parameter threshold according to the parameter threshold when the same type of unit is researched and researched in the cold state of other power plants, and storing the same type of unit parameter threshold into a database module;
setting an operation requirement parameter threshold by power plant operators and storing the operation requirement parameter threshold in a database module;
collecting real-time parameters in the cold starting process of the steam turbine, and storing the real-time parameters in a database module, wherein the real-time parameters comprise at least one of expansion difference, temperature, pressure and rotating speed;
Comparing the real-time parameters with three parameter thresholds of the database module at the same time, judging whether the real-time parameters are in the range of a simulation parameter threshold, a similar unit parameter threshold and an operation requirement parameter threshold, and outputting three groups of comparison results;
alarming and prompting are carried out according to the three groups of comparison results, if the real-time parameters are in the range of the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold, the prompting parameter is set normally, otherwise, the prompting parameter is set abnormally;
if the prompt parameter setting is normal, continuously collecting real-time parameters of the steam turbine; and if the prompt parameter setting is abnormal, corresponding parameter setting suggestions are carried out according to the data stored by the database module.
In a third aspect, the present invention provides a storage medium storing a computer program executable by one or more processors to implement a steam turbine cold start warning method as described above.
In a fourth aspect, the present invention provides an electronic device, including a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the cold start early warning method of the steam turbine is executed.
One or more embodiments of the above-described solution may have the following advantages or benefits compared to the prior art:
1. According to the steam turbine cold start early warning system, the method, the storage medium and the electronic equipment, whether the real-time parameters are normal or not is intelligently judged by comparing the real-time parameters acquired in the steam turbine cold start process with three parameter thresholds pre-stored in the database module, and parameter setting suggestions are automatically prompted for abnormal parameters; on the traditional DCS system, a monitoring and early warning module for main parameters in the cold starting process is added, so that an operator is prompted and warned, the operator can know whether the parameter setting is reasonable or not in time, and the system is more intelligent and automatic; the rationality of parameters in the cold starting process of the steam turbine is judged in multiple aspects through three parameter threshold standards, namely a simulation parameter threshold, a similar unit parameter threshold and an operation requirement parameter threshold, and the system is more differentiated; by prompting parameter setting suggestion for abnormal parameters, operators with less experience can conveniently adjust parameter setting correspondingly, and manual misoperation is avoided.
2. According to the invention, the operation requirement parameter threshold value is input according to the actual operation requirement of the power plant, and the threshold value can be set according to the operation requirements of different power plants, so that more reasonable starting parameter setting is performed, the safety, the reliability and the service life of the steam turbine are improved, the cold starting time of the steam turbine can be shortened to the greatest extent, and the heat exchange efficiency of the boiler and the economy of the steam turbine unit are improved.
3. Because the cold starting process of the turbine unit has a plurality of influencing factors, the invention only alarms and sets suggestions aiming at key parameters in the starting process of the turbine by collecting expansion difference, temperature, pressure and rotating speed, thereby more effectively shortening the cold starting time of the turbine, enabling the whole turbine unit to be started quickly, enabling the flue temperature of a flue at the tail part of a boiler to reach denitration input conditions as soon as possible, reducing the emission of NOx, reducing the pollution to the environment, having strong adaptability, universality, innovation and application value, and being suitable for technical popularization and expansion application.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings.
FIG. 1 is a system block diagram of a cold start early warning system for a steam turbine according to an embodiment of the present invention;
FIG. 2 is a system block diagram of another cold start early warning system for a steam turbine according to an embodiment of the present invention;
FIG. 3 is a graph showing a trend of a curve of a medium pressure cylinder started in a cold state by a conventional manner in the first embodiment of the present invention;
FIG. 4 is a display interface of a display terminal employing cold start according to an embodiment of the present invention;
fig. 5 is a graph showing the trend of the curve of the medium pressure cylinder started in the cold state according to the first embodiment of the present invention.
In the drawings, like parts are given like reference numerals, and the drawings are not drawn to scale.
Detailed Description
The following will describe embodiments of the present invention in detail with reference to the drawings and examples, thereby solving the technical problems by applying technical means to the present invention, and realizing the corresponding technical effects can be fully understood and implemented accordingly. The embodiment of the invention and the characteristics in the embodiment can be mutually combined on the premise of no conflict, and the formed technical scheme is within the protection scope of the invention.
Example 1
Referring to fig. 1 to 2, an embodiment of the present invention provides a cold start early warning system for a steam turbine, the system includes:
The parameter acquisition module is used for acquiring real-time parameters in the cold start process of the steam turbine, wherein the real-time parameters comprise at least one of expansion difference, temperature, pressure and rotating speed;
The database module is used for storing simulation parameter thresholds set by a steam turbine manufacturer, similar unit parameter thresholds and operation requirement parameter thresholds set by a power plant according to actual operation requirements;
the judging module is connected with the parameter acquisition module and the database module, and is used for comparing the real-time parameter with three parameter thresholds of the database module at the same time, judging whether the real-time parameter is in the range of a simulation parameter threshold, a similar unit parameter threshold and an operation requirement parameter threshold, and outputting three groups of comparison results;
The warning module is connected with the judging module and used for warning and prompting according to the three groups of comparison results, if the real-time parameters are in the range of the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold, the prompt parameter setting is normal, otherwise, the prompt parameter setting is abnormal, and the real-time parameters are respectively indicated to be normal or abnormal in the range of the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold;
The suggestion module is connected with the warning module and the database module and is used for correspondingly carrying out parameter setting suggestions when the warning module prompts that the real-time parameters are abnormal in at least one threshold range of a simulation parameter threshold, a similar unit parameter threshold and an operation requirement parameter threshold, wherein the parameter setting suggestions comprise increasing or decreasing main steam flow, increasing or decreasing main steam temperature, increasing or decreasing condenser vacuum pressure and increasing or decreasing rotor rotating speed;
The input module is connected with the database module and is used for inputting an operation requirement parameter threshold to the database module according to the actual operation requirement of the power plant; and
And the display terminal is connected with the warning module and the suggestion module and is used for displaying real-time parameters, warning prompt information and parameter setting suggestions.
Further, the parameter acquisition module includes:
collecting a high-pressure cylinder expansion difference sub-module, a medium-pressure cylinder expansion difference sub-module and a low-pressure cylinder expansion difference sub-module of expansion difference,
A high pressure cylinder temperature sub-module, a medium pressure cylinder temperature sub-module, a main steam valve temperature sub-module and a regulating valve temperature sub-module for collecting temperature,
Condenser vacuum pressure sub-module for collecting pressure, and
And a rotor rotating speed sub-module for collecting rotating speed.
Further, the database module includes:
the acquisition parameter storage sub-module is used for storing the real-time parameter data acquired by the parameter acquisition module;
The simulation parameter threshold submodule is used for storing a simulation parameter threshold value calculated by a turbine manufacturer according to a finite element model when the turbine is started in a cold state;
The similar unit parameter threshold submodule is used for storing similar unit parameter thresholds of the same type of unit when the turbine manufacturer researches the same type of unit in cold starting of other power plants;
And the operation requirement parameter threshold value sub-module is used for storing the operation requirement parameter threshold value set by an operator through the input module.
Specifically, a turbine with model numbers of CC350/275-24.2/1.4/0.4/566/566, maximum continuous output of 391MW, rated output of 350MW and rated rotation speed of 3000 rpm is started in a cold state, and the turbine consists of a high-pressure module, a medium-pressure module and a low-pressure module, namely, the turbine is provided with a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, and the inner cylinder is of a single-layer cylinder structure.
Firstly, the turbine is started to 3000 rpm in a cold state in a traditional mode, the time required for AGC input from the ignition of a boiler to the load carrying and 165MW is 35 hours, as shown in a medium pressure cylinder curve change trend chart shown in FIG. 3, the analysis data range is a time range from the ignition of the boiler to the load carrying and 165MW of a unit, and the time range is divided into 5 time ranges as shown in Table 1:
TABLE 1
| Numbering device | Time frame (time: minute) | DETAILED DESCRIPTIONS | Duration of time |
| 1 | 00:00～00:16 | Jigger speed is 1152 rpm | For 16 minutes |
| 2 | 00:16～02:16 | 1152 Rpm warm-up machine | For 2 hours |
| 3 | 02:16～02:23 | 1152 Rpm to 3000 rpm | 7 Minutes |
| 4 | 02:23～14:08 | 3000 Rpm heating machine | 11 Hours 45 minutes |
| 5 | 14:08～35:54 | 3000 Rpm load to 165MW | 20 Hours and 46 minutes |
As can be seen from fig. 3 and table 1, at time 00:00, the reheat steam temperature was 336.8 ℃, and the intermediate pressure cylinder expansion difference was 3.56mm;
From the time of 00:00 to the time of 00:16, the rotating speed of the unit is rotated to 1152 r/min for 16 minutes, the rising rate is about 72 r/min, the reheat steam temperature is 336.7 ℃, and the expansion difference of the medium pressure cylinder is 3.81mm;
starting medium-speed warm-up from the moment of 00:16 to the moment of 02:16, stopping the warm-up, wherein the warm-up time is 2 hours, the reheat steam temperature is 343.4 ℃, and the expansion difference of the medium-pressure cylinder is 3.96mm;
starting at the time of 02:16, the rotating speed is increased from 1152 rpm to 3000 rpm, 7 minutes are consumed until the time reaches 02:23, the rising speed is 264 rpm, the reheat steam temperature is 337.8 ℃, and the expansion difference of the medium pressure cylinder is 3.67mm;
Starting from the moment 02:23, carrying out high-speed warm-up at 3000 rpm until the temperature reaches 14:08, stopping for 11 hours and 45 minutes, wherein the reheat steam temperature is 372.9 ℃, and the expansion difference of the medium pressure cylinder is 4.08mm;
The load was increased from 14:08 to 165MW, to 35:54 cutoff for a total of 20 hours and 46 minutes, at which point the reheat steam temperature was 526.4C and the intermediate pressure cylinder differential expansion was 3.9mm.
From the whole starting time of the unit, the total time is 34 hours and 54 minutes, the consumed time is long, adverse effects are brought to the safety and economy of the unit, meanwhile, the flue gas temperature of the tail flue of the boiler after grid connection cannot reach the denitration input condition rapidly, the NOx emission reaches the standard and is delayed, and the environmental pollution is caused to a certain extent.
Even if the unit is fully warmed up by the high-pressure cylinder in the cold starting process, and the operation such as full warm-up, drainage, random starting of the heater and the like is performed in the speed increasing process, the time is at least 25.5 hours, and the time of the unit for connecting the unit with low load after grid connection is shortened, but the unit has a larger gap from the cold starting curve provided by a turbine manufacturer, so that the stability and the service life of the turbine can be influenced.
The steam turbine cold start early warning system provided by the embodiment is adopted for cold start of the steam turbine, and the working process of the system is as follows:
firstly, a turbine manufacturer calculates a parameter threshold setting simulation parameter threshold when a turbine is started in a cold state according to a finite element model, for example, the relative error between a set actual measurement value and a simulation value of the finite element model is not more than 8.5%, the parameter setting simulation parameter threshold is stored in a simulation parameter threshold submodule of a database module, similar unit parameter thresholds are set according to the parameter threshold when a unit of the same type is researched and researched in cold state of other power plants, for example, parameter values of other turbines of the same type which are started normally in the cold state and have short starting time are stored in a similar unit parameter threshold submodule of the database module, a power plant operator sets an operation requirement parameter threshold through an input module, and the parameter setting is required according to the actual condition of the power plant and the parameter threshold value is stored in the operation requirement parameter threshold submodule of the database module;
After the steam turbine is started, a parameter acquisition module of the system acquires the expansion difference of a high-pressure cylinder, the expansion difference of a medium-pressure cylinder, the expansion difference of a low-pressure cylinder, the temperature of the high-pressure cylinder, the temperature of the medium-pressure cylinder, the temperature of a main steam valve, the temperature of a regulating valve, the vacuum pressure of a condenser and the rotating speed of a rotor in real time respectively, sends the acquired parameters to a judgment module and stores the acquired parameters into an acquisition parameter storage submodule of a database module, wherein the number of actual parameter acquisition points can be set according to the actual conditions of a power plant turbine unit, for example, the acquisition points of the temperature of the high-pressure cylinder comprise the temperature of the outer wall, the temperature of the inner wall and the temperature difference of the inner wall of the high-pressure regulating stage, the temperature of the inner wall and the temperature difference of the inner wall and the temperature of the inner wall of the medium-pressure cylinder, the collecting points of the main steam valve temperature comprise the inner wall temperature, the outer wall temperature and the inner and outer wall temperature difference of the high-pressure main steam valve, the collecting points of the regulating valve temperature comprise the inner wall temperature, the outer wall temperature and the inner and outer wall temperature difference of the high-pressure regulating valve, in the embodiment, the expansion difference of the medium-pressure cylinder is provided with two collecting points, the high-pressure cylinder temperature collecting point is the outer wall temperature of the high-pressure regulating stage, the medium-pressure cylinder temperature collecting point is the inner wall temperature of the medium-pressure inner cylinder, the upper half inner wall temperature of the medium-pressure steam outlet and the lower half inner wall temperature of the medium-pressure steam outlet, the main steam valve temperature collecting point is the outer wall temperature of the high-pressure main steam valve, and the regulating valve temperature collecting point is the outer wall temperature of the high-pressure regulating valve;
the judging module is used for comparing the acquired real-time parameters with the simulation parameter threshold value, the similar unit parameter threshold value and the operation requirement parameter threshold value stored by the database module at the same time and outputting a comparison result to the warning module;
The warning module carries out warning prompt according to a comparison result, prompts that corresponding parameter setting is normal or abnormal, if the warning prompt parameter is normal, the parameter acquisition module continues to acquire real-time parameters, if the warning prompt parameter is abnormal, parameter setting advice is carried out according to data stored by the database module, the parameter setting advice comprises increasing or decreasing main steam flow, increasing or decreasing main steam temperature, increasing or decreasing condenser vacuum pressure and increasing or decreasing rotor rotating speed, for example, when the expansion difference parameter is abnormal, the main steam temperature is correspondingly increased or decreased according to the corresponding advice of the real-time expansion difference parameter being lower than or higher than a parameter threshold, when the temperature parameter is abnormal, the main steam flow is correspondingly increased or decreased according to the corresponding advice of the real-time temperature parameter being lower than or higher than the parameter threshold, when the pressure parameter is abnormal, the condenser vacuum pressure is correspondingly increased or decreased according to the corresponding advice of the real-time pressure parameter being lower than or higher than the parameter threshold, when the rotating speed parameter is abnormal, the rotating speed is correspondingly increased or decreased according to the corresponding advice of the real-time rotating speed parameter being lower than or higher than the parameter threshold, and the critical rotating speed of the rotor changes in real-time early warning;
finally, the real-time parameters, the alarm prompt information and the parameter setting suggestions are displayed through the display terminal, as shown in fig. 4, which is a display interface of the display terminal, wherein the left column in the figure is the real-time parameters, the right column is the parameter setting suggestions, and the alarm prompt information is reminded through a popup window (not shown in the figure).
The operator obtains a medium pressure cylinder curve change trend chart shown in fig. 5 after comprehensively considering the whole running state of the unit and adjusting parameters in the cold starting process according to the working flow and parameter setting suggestions, analyzes the time period from the ignition of the boiler to the loading of the unit to 165MW, and divides the time period into 7 time ranges as shown in table 2:
TABLE 2
| Numbering device | Time frame | DETAILED DESCRIPTIONS | Duration of time |
| 1 | 00:00～00:04 | 8.8 Rpm to 502.2 rpm | 4 Minutes |
| 2 | 00:04～00:32 | 502.2 Revolutions per minute warm-up machine | 28 Minutes |
| 3 | 00:32～00:39 | 502.2 Rpm to 1152 rpm | 7 Minutes |
| 4 | 00:39～02:26 | 1152 Rpm warm-up machine | 1 Hour and 47 minutes |
| 5 | 02:26～02:34 | 1152 Rpm to 3000 rpm | 8 Minutes |
| 6 | 02:34～05:24 | 3000 Rpm heating machine | 2 Hours 50 minutes |
| 7 | 05:24～14:15 | 3000 Rpm, load increases from zero to 165MW | 8 Hours 51 minutes |
As can be seen from fig. 5 and table 2, at time 00:00, the reheat steam temperature was 342.3 ℃, and the intermediate pressure cylinder expansion difference was 4.0mm;
from the time of 00:00 to the time of 00:04, the rotating speed of the unit is rotated to 502 rpm for 4 minutes, the rising rate is about 123.4 rpm, the reheat steam temperature is 336.7 ℃, and the expansion difference of the medium pressure cylinder is 4.2mm;
The machine set is warmed up from the moment 00:04 to the moment 00:32 for 28 minutes, the reheat steam temperature is 328.3 ℃, and the expansion difference of the medium pressure cylinder is 4.2mm;
From the time of 00:32 to the time of 00:39, the rotating speed of the unit is rotated to 1152 r/min for 7 minutes, the rising rate is about 92.8 r/min, the reheat steam temperature is 326.8 ℃, and the expansion difference of the medium pressure cylinder is 4.2mm;
The machine set is warmed up from the time of 00:39 to the time of 02:26 at the rotating speed of 1152 r/min for 1 hour and 47 minutes, the reheat steam temperature is 336.5 ℃, and the expansion difference of the medium pressure cylinder is 4.3mm;
from the time of 02:26 to the time of 02:34, the rotating speed of the unit is rotated to 3000 rpm for 8 minutes, the rising rate is about 231 rpm, the reheat steam temperature is 336.2 ℃, and the expansion difference of the medium pressure cylinder is 4.04mm;
the machine set is warmed up from the moment 02:34 to the moment 05:24 at the rotating speed of 3000 rpm for 2 hours and 50 minutes, the reheat steam temperature is 346.4 ℃ at the moment, and the expansion difference of the medium pressure cylinder is 4.68mm;
Starting from 05:24 to 14:15, the load is increased to 165MW, and the load is increased to 2019/6/4:15, and the load is cut off for 8 hours and 51 minutes, wherein the reheat steam temperature is 516.4 ℃, and the expansion difference of the medium pressure cylinder is 4.93mm.
From the whole starting time of the unit, the total time is 14 hours and 16 minutes, the time consumption is obviously shortened, the expansion difference of the medium-pressure cylinder always fluctuates within the range of 3.9-5.1 mm, the parameter setting measures given by the system are reasonable, and the time of high-speed warm-up and the load rising time are reduced. The system of the embodiment adds the monitoring and early warning module of main parameters in the cold starting process on the traditional DCS system, prompts and early warns operators, is convenient for the operators to know whether the parameter setting is reasonable in time, and has more intellectualization and automation; the rationality of parameters in the cold starting process of the steam turbine is judged in multiple aspects through three parameter threshold standards, namely a simulation parameter threshold, a similar unit parameter threshold and an operation requirement parameter threshold, and the system is more differentiated; by prompting parameter setting suggestion for abnormal parameters, operators with less experience can conveniently adjust parameter setting correspondingly, and manual misoperation is avoided; the operation requirement parameter threshold value is input according to the actual operation requirement of the power plant, and the threshold value can be set according to the operation requirements of different power plants, so that more reasonable starting parameter setting is performed, the safety, the reliability and the service life of the steam turbine are improved, the cold starting time of the steam turbine can be shortened to the greatest extent, and the heat exchange efficiency of the boiler and the economical efficiency of the steam turbine unit are improved.
Example two
The embodiment provides a steam turbine cold start early warning method applicable to electronic equipment based on the steam turbine cold start early warning system of the embodiment, wherein the method executes the following steps when applied to the electronic equipment:
Step 1: the method comprises the steps that a turbine manufacturer calculates a parameter threshold setting simulation parameter threshold when a turbine is started in a cold state according to a finite element model, for example, the relative error between a set actual measurement value and a simulation value of the finite element model is not more than 8.5%, the simulation parameter threshold is stored in a simulation parameter threshold submodule of a database module, similar unit parameter thresholds are set according to parameter thresholds of the same type of unit in cold state starting of other power plants in investigation, for example, parameter values of other types of turbines which are started in a normal cold state and have short starting time are stored in similar unit parameter threshold submodules of the database module;
step 2: the power plant operator sets the operation requirement parameter threshold value through the input module according to the actual condition of the power plant and stores the operation requirement parameter threshold value into the operation requirement parameter threshold value sub-module of the database module, so that the overall operation state of the unit can be comprehensively considered, and the threshold value can be set according to the operation requirements of different power plants, thereby performing more reasonable starting parameter setting;
Step 3: starting the steam turbine, wherein a parameter acquisition module acquires real-time parameters in the cold starting process of the steam turbine, the real-time parameters are sent to a judgment module and are stored in an acquisition parameter storage sub-module of a database module, and the real-time parameters comprise at least one of expansion difference, temperature, pressure and rotating speed;
specifically, the number of actual parameter collection points can be set according to the actual situation of the power plant turbine unit, in this embodiment, the expansion difference of the medium pressure cylinder is provided with two collection points, the collection points of the high pressure cylinder temperature comprise the outer wall temperature, the inner wall temperature and the inner and outer wall temperature difference of the high pressure regulating stage, the collection points of the medium pressure cylinder temperature comprise the outer wall temperature, the inner wall temperature and the inner and outer wall temperature difference of the medium pressure inner cylinder, the upper half inner wall temperature of the medium pressure exhaust port and the lower half inner wall temperature of the medium pressure exhaust port, the collection points of the main steam valve temperature comprise the inner wall temperature, the outer wall temperature and the inner and outer wall temperature difference of the high pressure main steam valve, and the collection points of the regulating valve temperature comprise the inner wall temperature, the outer wall temperature and the inner and outer wall temperature difference of the high pressure regulating valve;
Step 4: comparing the real-time parameter with the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold at the same time, judging whether the real-time parameter is in the range of the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold, and outputting three groups of comparison results;
Specifically, whether the real-time parameters are within a simulation parameter threshold, a similar unit parameter threshold and an operation requirement parameter threshold or not is respectively judged, and the parameters of the plurality of acquisition points in the step 3 are sequentially compared;
Step 5: alarming and prompting are carried out according to the three groups of comparison results, if the real-time parameters are in the range of the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold, the prompting parameter is set normally, otherwise, the prompting parameter is set abnormally;
Specifically, if a single parameter is beyond one of the thresholds, the parameter is indicated to be abnormal relative to the threshold, and prompts are sequentially carried out, for example, prompt that the high-pressure cylinder expansion difference is normal relative to the simulation parameter threshold, the high-pressure cylinder expansion difference is normal relative to the parameter threshold of the same type of unit, and the high-pressure cylinder expansion difference is abnormal relative to the operation requirement parameter threshold are sequentially prompted;
step 6: if the prompting parameters are normal, continuously acquiring real-time parameters of the steam turbine, and if the prompting parameters are abnormal, performing corresponding parameter setting suggestions according to the data stored by the database module, wherein the parameter setting suggestions comprise increasing or decreasing main steam flow, increasing or decreasing main steam temperature, increasing or decreasing condenser vacuum pressure and increasing or decreasing rotor rotating speed;
specifically, when the expansion difference parameter is abnormal, the main steam temperature is correspondingly suggested to be increased or decreased according to the fact that the real-time expansion difference parameter is lower than or higher than the parameter threshold, when the temperature parameter is abnormal, the main steam flow is correspondingly suggested to be increased or decreased according to the fact that the real-time temperature parameter is lower than or higher than the parameter threshold, when the pressure parameter is abnormal, the condenser vacuum pressure is correspondingly suggested to be increased or decreased according to the fact that the real-time pressure parameter is lower than or higher than the parameter threshold, when the rotating speed parameter is abnormal, the rotating speed is correspondingly suggested to be increased or decreased according to the fact that the real-time rotating speed parameter is lower than or higher than the parameter threshold, the rising speed is correspondingly increased or decreased, and the rotating speed change is real-time early-warned according to the critical rotating speed of the rotor;
step 7: the real-time parameters, the alarm prompt messages and the parameter setting suggestions are displayed through the display terminal, the real-time parameters and the alarm prompt messages are displayed through the display interface of the display terminal, and the alarm prompt messages are reminded in a popup window mode.
Because the cold starting process of the turbine unit has a plurality of influencing factors, the embodiment only alarms and sets suggestions for key parameters in the starting process of the turbine by collecting expansion difference, temperature, pressure and rotating speed, the cold starting time of the turbine is effectively shortened, the whole turbine unit is enabled to be started quickly, the flue temperature of a flue at the tail part of a boiler reaches denitration input conditions as soon as possible, NOx emission is reduced, environmental pollution is reduced, and the method has strong adaptability, universality, innovation and application value and is suitable for technical popularization and expansion application.
Example III
The present embodiment provides a computer readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, a server, an App application store, etc., on which a computer program is stored, which when executed by a processor, can implement the following method steps:
Calculating a parameter threshold setting simulation parameter threshold when the steam turbine is started in a cold state according to the finite element model by a steam turbine manufacturer, setting a similar unit parameter threshold according to the parameter threshold when the same type of unit is researched and researched in the cold state of other power plants, and storing the same type of unit parameter threshold into a database module;
setting an operation requirement parameter threshold by power plant operators and storing the operation requirement parameter threshold in a database module;
Collecting real-time parameters in the cold starting process of the steam turbine, and storing the real-time parameters in a database module, wherein the real-time parameters comprise expansion difference, temperature, pressure and rotating speed;
comparing the real-time parameters with the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold simultaneously, and outputting a comparison result;
Alarming and prompting according to the comparison result, wherein prompting parameters are normal or abnormal;
If the alarm prompt parameters are normal, continuously acquiring real-time parameters of the steam turbine, and if the alarm prompt parameters are abnormal, performing parameter setting suggestion according to the data stored by the database module.
The specific embodiment process of the above method steps can be referred to as the second embodiment, and the description of this embodiment is not repeated here.
Example IV
The embodiment of the invention provides electronic equipment which can be a mobile phone, a computer or a tablet personal computer and the like, and comprises a memory and a processor, wherein the memory is stored with a computer program which realizes the method in the second embodiment when being executed by the processor. It is to be appreciated that the electronic device can also include multimedia components, input/output (I/O) interfaces, and communication components.
Wherein the processor is configured to perform all or part of the steps in the application management method as in the first embodiment. The memory is used to store various types of data, which may include, for example, instructions for any application or method in the electronic device, as well as application-related data.
The Processor may be an Application SPECIFIC INTEGRATED Circuit (ASIC), a digital signal Processor (DIGITAL SIGNAL Processor, DSP), a digital signal processing device (DIGITAL SIGNAL Processing Device, DSPD), a programmable logic device (Programmable Logic Device, PLD), a field programmable gate array (Field Programmable GATE ARRAY, FPGA), a controller, a microcontroller, a microprocessor, or other electronic component for executing the Application management method in the first embodiment.
The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk or optical disk.
The multimedia component may include a screen, which may be a touch screen, and an audio component for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in a memory or transmitted through a communication component. The audio assembly further comprises at least one speaker for outputting audio signals.
The I/O interface provides an interface between the processor and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons.
The communication component is used for wired or wireless communication between the electronic device and other devices. Wireless Communication, such as Wi-Fi, bluetooth, near field Communication (NFC for short), 2G, 3G, or 4G, or a combination of one or more thereof, and accordingly the Communication component 405 may comprise: wi-Fi module, bluetooth module, NFC module.
In summary, according to the steam turbine cold start early warning system, the method, the storage medium and the electronic equipment provided by the invention, whether the real-time parameters are normal or not is intelligently judged by comparing the real-time parameters acquired in the steam turbine cold start process with three parameter thresholds pre-stored in the database module, and parameter setting suggestions are automatically prompted for the abnormal parameters; on the traditional DCS system, a monitoring and early warning module for main parameters in the cold starting process is added, so that an operator is prompted and warned, the operator can know whether the parameter setting is reasonable or not in time, and the system is more intelligent and automatic; the rationality of parameters in the cold starting process of the steam turbine is judged in multiple aspects through three parameter threshold standards, namely a simulation parameter threshold, a similar unit parameter threshold and an operation requirement parameter threshold, and the system is more differentiated; by prompting parameter setting suggestion for abnormal parameters, operators with less experience can conveniently adjust parameter setting correspondingly, and manual misoperation is avoided.
It should be noted that, since the drawings in the specification are not colored or modified, it is difficult to display a part of the drawings in which the distinction is obvious, and if necessary, a color picture may be provided.
In the several embodiments provided in the embodiments of the present invention, it should be understood that the disclosed system and method may be implemented in other manners. The system and method embodiments described above are merely illustrative.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.
Claims (9)
1. A steam turbine cold start early warning system, the system comprising:
The parameter acquisition module is used for acquiring real-time parameters in the cold starting process of the steam turbine;
the database module is used for storing the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold;
the judging module is connected with the parameter acquisition module and the database module, and is used for comparing the real-time parameter with three parameter thresholds of the database module at the same time, judging whether the real-time parameter is in the range of a simulation parameter threshold, a similar unit parameter threshold and an operation requirement parameter threshold, and outputting three groups of comparison results;
The warning module is connected with the judging module and used for warning and prompting according to the three groups of comparison results, and prompting that the real-time parameters are normal or abnormal in the range of the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold respectively; and
The suggestion module is connected with the warning module and the database module and is used for prompting that the real-time parameter is abnormal in at least one threshold range of the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold, and the parameter setting suggestion comprises increasing or decreasing the main steam flow, increasing or decreasing the main steam temperature, increasing or decreasing the condenser vacuum pressure and increasing or decreasing the rotor rotating speed.
2. The turbine cold start early warning system of claim 1, further comprising:
and the input module is connected with the database module and is used for inputting the operation requirement parameter threshold value into the database module according to the actual operation requirement of the power plant.
3. The turbine cold start early warning system of claim 1, further comprising:
and the display terminal is connected with the warning module and the suggestion module and is used for displaying real-time parameters, warning prompt information and parameter setting suggestions.
4. The turbine cold start warning system of claim 1, wherein the real-time parameters include at least one of differential expansion, temperature, pressure, and rotational speed.
5. The steam turbine cold start early warning system of claim 1, wherein the parameter acquisition module comprises:
collecting a high-pressure cylinder expansion difference sub-module, a medium-pressure cylinder expansion difference sub-module and a low-pressure cylinder expansion difference sub-module of expansion difference,
A high pressure cylinder temperature sub-module, a medium pressure cylinder temperature sub-module, a main steam valve temperature sub-module and a regulating valve temperature sub-module for collecting temperature,
Condenser vacuum pressure sub-module for collecting pressure, and
And a rotor rotating speed sub-module for collecting rotating speed.
6. The steam turbine cold start early warning system of claim 2, wherein the database module comprises:
the acquisition parameter storage sub-module is used for storing the real-time parameter data acquired by the parameter acquisition module;
The simulation parameter threshold submodule is used for storing a simulation parameter threshold value calculated by a turbine manufacturer according to a finite element model when the turbine is started in a cold state;
the similar unit parameter threshold submodule is used for storing similar unit parameter thresholds when turbine manufacturers research the same type of unit cold state start;
And the operation requirement parameter threshold value sub-module is used for storing the operation requirement parameter threshold value set by an operator through the input module.
7. A steam turbine cold start early warning method based on the steam turbine cold start early warning system according to any one of claims 1 to 6, characterized in that the method comprises:
Setting a simulation parameter threshold, setting a similar unit parameter threshold, and storing the same to a database module;
Setting an operation requirement parameter threshold and storing the operation requirement parameter threshold in a database module;
collecting real-time parameters in the cold starting process of the steam turbine, and storing the real-time parameters in a database module, wherein the real-time parameters comprise at least one of expansion difference, temperature, pressure and rotating speed;
Comparing the real-time parameters with three parameter thresholds of the database module at the same time, judging whether the real-time parameters are in the range of a simulation parameter threshold, a similar unit parameter threshold and an operation requirement parameter threshold, and outputting three groups of comparison results;
alarming and prompting are carried out according to the three groups of comparison results, if the real-time parameters are in the range of the simulation parameter threshold, the similar unit parameter threshold and the operation requirement parameter threshold, the prompting parameter is set normally, otherwise, the prompting parameter is set abnormally;
if the prompt parameter setting is normal, continuously collecting real-time parameters of the steam turbine; and if the prompt parameter setting is abnormal, corresponding parameter setting suggestions are carried out according to the data stored by the database module.
8. A storage medium having a computer program stored thereon, wherein the computer program is executable by one or more processors to implement the steam turbine cold start warning method of claim 7.
9. An electronic device comprising a memory and a processor, wherein the memory has a computer program stored thereon that, when executed by the processor, implements the cold start warning method of a steam turbine of claim 7.
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