CN101832543A - Method for intelligently managing wall temperature of final superheater and final reheater of boiler of power station - Google Patents
Method for intelligently managing wall temperature of final superheater and final reheater of boiler of power station Download PDFInfo
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Abstract
The invention provides a method for intelligently managing wall temperatures of a final superheater and a final reheater of a boiler of a power station. The method comprises the following steps of: firstly, building an online monitoring device, then reading online detection data of the final superheater and the final reheater of the boiler in a plant-level supervisory information system database and storing the data into a local relation type database; calculating the steam temperature and the tube wall temperature of each calculation point in the boiler according to the read online detection data; counting the data distribution range of historical temperatures of each screen, each tube and each calculation point of the final superheater and the final reheater and the over-temperature running time of each calculation point; and finally displaying the calculated result in real time. The invention has the advantages of realizing the fast online real-time calculation and the online monitoring and controlling of the wall temperatures of the final superheater and the final reheater of the boiler, realizing the safety operation of the final superheater and the final reheater of the boiler within the service period, and prolonging the service life of the final superheater and the final reheater of the boiler.
Description
Technical field
The present invention relates to a kind of station boiler finishing superheater and final reheater intelligence wall temperature management method, belong to the station boiler technical field.
Background technology
The developing stage that the generating set of present China has entered big capacity, high parameter, the supercritical unit of a collection of 600MW, 1000MW grade puts into operation in succession.Along with the raising of boiler parameter, the especially raising of vapor (steam) temperature, it is more outstanding such as the overtemperature problem that oxidation scale in the pipe causes that some are different from subcritical parameter.Big capacity super critical boiler generation booster that is in operation not only can cause huge direct economic loss, and since near the booster zone large stretch of pipe impaired, buried the hidden danger of continuous booster, have a strong impact on the safe operation of boiler.
For formation speed that slows down oxide skin in finishing superheater and the final reheater pipe and the booster that results in blockage that peels off of controlling oxide skin, effectively the interior wall temperature of the stove of monitoring finishing superheater and final reheater boiler tube distributes simultaneously, the blocking position of monitoring oxide skin, need further research finishing superheater and current running status and the interior wall temperature distribution of stove of final reheater, develop 600MW super critical boiler finishing superheater and final reheater intelligence wall temperature management method.
Summary of the invention
The object of the present invention is to provide a kind of boiler superheater and reheater intelligence wall temperature management method of carrying out, realization is carried out intelligent management to boiler finishing superheater and final reheater heating surface pipe, and one of thermal power plant or several unit boiler finishing superheaters and final reheater monitoring real time execution situation is provided.
In order to achieve the above object, technical scheme of the present invention has provided a kind of station boiler finishing superheater and final reheater intelligence wall temperature management method, it is characterized in that step is:
Step 1, web page server is connected with user side browser, database server and calculation server respectively, database server is connected with calculation server, and database server is connected by plant level supervisory information system and Power Plant DCS System or mis system and online measuring point;
Step 2, read boiler finishing superheater and final reheater online monitoring data in the plant level supervisory information system database, and be saved in the local relevant database;
The online monitoring data that step 3, basis read is calculated the vapor (steam) temperature and the tube wall temperature of each calculation level in the stove;
Each screen of step 4, statistics finishing superheater and final reheater is respectively managed the overheating operation time of the historical temperature data distribution of each calculation level and each calculation level;
Step 5, show result of calculation in real time.
The present invention has following characteristics:
1, on the calculated/applied server of boiler finishing superheater and final reheater thermal deviation on-line monitoring, installs with the boiler finishing superheater of VB language compilation and the computer software of final reheater intelligence wall temperature management, according to the time interval of software set, the boiler parameter of the on-line monitoring that from database server, reads, the wall temperature of online real-time calculating boiler, the result that computational analysis draws, deliver to database server again and preserve, call for web page server.
2, database server is deposited two class data:
Primary sources are the data of boiler parameter on-line monitoring, comprise main steam pressure (MPa), main steam temperature (℃), electric load amount (MW), each measuring point real time temperature of finishing superheater (℃), each measuring point real time temperature of final reheater (℃) etc.;
Secondary sources are the result of calculation of boiler finishing superheater and final reheater steam temperature, wall temperature.
3, external system interface has two kinds of functions:
The one, the monitor value of boiler parameter is deposited in database;
The 2nd, the boiler operatiopn control measure are transferred to boiler control system.
4, boiler automatic control system and parameter measuring point have two kinds of functions:
One provides the parameter of boiler on-line monitoring;
The 2nd, instruct the operation of boiler according to the result of calculation of boiler finishing superheater and final reheater wall temperature, guarantee boiler finishing superheater and final reheater not overtemperature, move at safe condition.
5, boiler finishing superheater and the online result calculated of final reheater wall temperature wall temperature are distributed on the computer website browser, according to the browser end user is that the technical staff of power plant sends request, by boiler finishing superheater in the calculated/applied server calls database server and the real-time result of calculation of final reheater wall temperature, on web page server, form boiler finishing superheater and final reheater intelligence wall temperature management result, return to the browser end user, instruct boiler operatiopn.
6, the user side browser is used for checking the intelligent wall temperature management result of boiler finishing superheater and final reheater.
The boiler finishing superheater that the present invention provides and final reheater intelligence wall temperature management method and system can realize online real-time calculating and the LINE REAL TIME MONITORING and the control of boiler finishing superheater and final reheater wall temperature.If a certain tube panel temperature of boiler finishing superheater and final reheater surpasses warning value, mode by online real-time control steam flow and boiler combustion adjustment reduces tube wall temperature, boiler finishing superheater and final reheater tube wall are in a safe condition, have reached the technique effect that monitors and control boiler finishing superheater and the management of final reheater intelligence wall temperature.
Advantage of the present invention is to realize boiler finishing superheater and final reheater wall temperature online real-time calculating and in-service monitoring and control fast, realize the safe operation in the phase under arms of boiler finishing superheater and final reheater, reached the technique effect in prolonged boiler finishing superheater and final reheater service life.
Description of drawings
Fig. 1 is the block diagram of boiler finishing superheater of the present invention and final reheater intelligence wall temperature management devices.
The specific embodiment
Specify the present invention below in conjunction with embodiment.
Embodiment
For the overcritical 600MW station boiler of certain power plant, finishing superheater and final reheater adopt intelligent wall temperature management system shown in Figure 1.Its main composition by: calculation server, database server, web page server and plant level supervisory information system (PI system) are formed.Web page server is connected with user side browser, database server and calculation server respectively, database server is connected with calculation server, and database server is connected by plant level supervisory information system and Power Plant DCS System or mis system and online measuring point.
Method provided by the invention comprises the following steps:
The first step: read boiler finishing superheater and final reheater online monitoring data in the PI database, and be saved in the local relevant database.
The data-interface service routine is every Δ τ=30s trigger process regularly: at first set up db transaction, realize reading data and being saved in the function of local data base from the PI Database Systems.In timetable, insert up-to-date data line, comprise corresponding ID and time.From the PI real-time data base read base regime information (main steam pressure (MPa), main steam temperature (℃), electric load amount (MW), each measuring point real time temperature of finishing superheater (℃), each measuring point real time temperature of final reheater (℃) etc.) and be saved in local relevant database.
Second step: the vapor (steam) temperature of calculating each calculation level in the stove (determining calculation level) according to actual measurement data according to heated face structure and user's request.
1, the segmentation computation model of steam temperature in the stove:
The flow through enthalpy of pipeline section of working medium increases to:
In the formula: K
1Be thermal deviation coefficient along the flue width; K
4Be thermal deviation coefficient along the screen height; E
0Area conversion factor for intermediate tube; l
aBe length of pipe section; D is a tube outer diameter; D
iOne calculates the flow of pipeloop; P
1And P
2Be respectively bottom smokestack radiation factor and anterior smokestack radiation factor; q
F1And q
F2Be respectively bottom smokestack and anterior smokestack radiant heat load; q
pFor the screen between flue gas to the screen radiation and the thermic load of convection heat transfer; ξ
1Heating surface deviation factor for pipeline section.The enthalpy result shows promptly vapor (steam) temperature as can be known by steam enthalpy temperature.
2, the technological difficulties of segmentation computation model:
The calculating of radiation factor:
In the formula: x
fBe the RADIATION ANGLE COEFFICIENT of smokestack to pipe row; s
1Be pipe transverse pitch (screen spacing).
Finding the solution of ascent: the ascent of each comb is calculated in definition according to ascent
Finding the solution of radiation penetrance:
During steam temperature calculates in stove in the past, generally all regard the radiation penetrance as 1 and handle, bring bigger deviation can for so interior steam temperature of stove and calculation of Wall Temperature, in order further accurately to calculate steam temperature and wall temperature in the stove, we must consider the influence of radiation penetrance.For this reason, we introduce the radiation penetrance in the calculating of radiation factor, take into full account the influence of penetrance to steam temperature and calculation of Wall Temperature.The influence of the consideration penetrance then formula of radiation factor calculating is:
The computational process of radiation penetrance τ is: according to calculating pipeline section residing position in stove, definition by penetrance is set out, calculate between parallel rectangle plane and the interplanar radiation penetrance of vertical rectangle problem with a multiple integral formula, its precision of radiation penetrance that calculates is higher, can solve the radiation penetrance problem of interior steam temperature of stove and calculation of Wall Temperature.
3, flow rate calculation
The flow of each sheet screen:
In the formula: g
i---calculate the flow of tube panel, g
0---the flow of average discharge tube panel, Δ P
iBe each screen pressure reduction, Δ P
0Be average pressure reduction;
The 3rd step: the tube wall temperature that calculates each calculation level in the stove according to actual measurement data.
1, tube wall metal temperature:
2, outside wall temperature:
In the formula: t
qBe vapor (steam) temperature in the calculation level pipe; β is a tube outer diameter and the ratio of internal diameter; μ is a coefficient of heat transfer; δ is the pipe wall thickness; Q is calculation level pipe heat absorption load; λ is the thermal conductivity factor of tube wall metal; α
2Exothermic coefficient for steam side;
3, pipe heat absorption load:
In the formula: θ is the calculation level flue-gas temperature; α
1Be calculation level fume side coefficient of convective heat transfer; α
3Be calculation level gas radiation exothermic coefficient; ε is the contamination factor of calculation level pipe.
The 4th step: each screen of statistics finishing superheater and final reheater is respectively managed the historical temperature data distribution of each calculation level.
Calculate each screen in real time and respectively manage the wall temperature of each calculation level, add up its historical distributed intelligence respectively.Set up historical data segmentation summary sheet in database side, the corresponding record of each calculation level, each record is gone up temperature is carried out the segmentation statistics, with 2 degrees centigrade is the interval, add up the Cumulative Elapsed Time of each calculation level segmentation temperature, when the Practical Calculation temperature is in the middle of two waypoint Temperature numerical, add up this calculation level tube wall temperature running time with less waypoint temperature.
The 5th step: each screen of statistics finishing superheater and final reheater is respectively managed each calculation level overtemperature time.
The maximum that various tubing are set allows running temperature, and (historical data base is the container that back-end data is preserved in the whole computational process, and each step data all will be saved in the historical data base after calculating and finishing according to historical data base then.Historical data base is installed on the database server, the data of preserving in database as time passes, all become historical data, especially calculate for the accumulation of overtemperature time in the database) in each screen respectively manage the Cumulative Elapsed Time and the corresponding segments point temperature of each segmentation temperature of each calculation level, each shields the overheating operation time of respectively managing each calculation level accumulation calculating.
The 6th step: each shields tube wall temperature, vapor (steam) temperature and the overtemperature information of respectively managing each calculation level to show finishing superheater and final reheater in real time.
The user selects " real time temperature detection " at display interface, select " finishing superheater " or " final reheater " object, and selection " screen " " pipe " " point ", display routine is imported the up-to-date record of real time access database correspondence position tube wall temperature table according to the user, the tube wall temperature that shows relevant position in the stove, according to the maximum allowable temperature of this position tubing, judge whether overtemperature of tube wall temperature, then use red display as overtemperature.The vapor (steam) temperature that shows relevant position in the stove according to the maximum allowable temperature of this position vapor (steam) temperature in the stove, is judged whether overtemperature of vapor (steam) temperature, then uses red display as overtemperature.
The 7th step: show in real time between finishing superheater and final reheater screen that vapor (steam) temperature distributes between tube wall temperature, screen, thermal deviation curve between screen.
The user selects " real time temperature detection " at display interface, select " finishing superheater " or " final reheater " object, and selection " screen " " pipe " " point ", storing process in the display routine real time access database is imported according to the user and to be shown between corresponding screen vapor (steam) temperature between tube wall temperature, screen.
The user selects " thermal deviation management " at display interface, selects " finishing superheater " or " final reheater " object, a up-to-date data record of display routine real time access database corresponding data table.
The 8th step: each screen of demonstration finishing superheater final reheater is respectively managed the historical temperature data distribution of each calculation level.
The user selects " monitoring running state " at display interface, select " finishing superheater " or " final reheater " object, select " operation conditions ", storing process in the display routine accessing database, import selection " screen " " pipe " " point " according to the user, show the tubing running temperature segmentation statistical information of relevant position.
The 9th step: show that finishing superheater final reheater tube wall temperature overtemperature information gathers.
The user selects " overtemperature information gathers " at display interface, selects " finishing superheater " or " final reheater " object, has finished the overtemperature information of statistics in the display interface real time access database, and has been input to display interface.
The tenth step: generate the maintenance suggestion automatically according to overtemperature information.
The user selects " system overhaul suggestion " at display interface, and display routine is according to the overtemperature information and the overtemperature time of tubing, and the material of tubing, generates the maintenance suggestion of boiler operatiopn automatically.Demonstration is to estimating the service life of particular location tubing, and makes the suggestion of changing tubing.
The 11 step: daily sheet, weekly return, month form of online generating run load statistics.
The user selects " operating load statistics " at display interface, display routine is added up the load of boiler operatiopn, the running time of each load section that 90% load at the line computation boiler is above, 80%-90% load, 70%-80% load, 60%-70% load, 50%-60% load, 50% load are following, and generation daily sheet, weekly return, the moon form.
Claims (6)
1. station boiler finishing superheater and final reheater intelligence wall temperature management method is characterized in that step is:
Step 1, web page server is connected with user side browser, database server and calculation server respectively, database server is connected with calculation server, and database server is connected by plant level supervisory information system and Power Plant DCS System or mis system and online measuring point;
Step 2, read boiler finishing superheater and final reheater online monitoring data in the plant level supervisory information system database, and be saved in the local relevant database;
The online monitoring data that step 3, basis read is calculated the vapor (steam) temperature and the tube wall temperature of each calculation level in the stove;
Each screen of step 4, statistics finishing superheater and final reheater is respectively managed the overheating operation time of the historical temperature data distribution of each calculation level and each calculation level;
Step 5, show result of calculation in real time.
2. a kind of station boiler finishing superheater as claimed in claim 1 and final reheater intelligence wall temperature management method is characterized in that the calculation procedure of each calculation level vapor (steam) temperature is described in the step 3:
Step 3.1A, calculating radiation penetrance τ
According to calculating pipeline section residing position in stove, set out by the definition of penetrance, calculate between parallel rectangle plane and the interplanar radiation penetrance of vertical rectangle τ with a multiple integral formula;
Step 3.2A, calculating radiation factor and ascent
Radiation factor is:
Wherein, x
fBe the RADIATION ANGLE COEFFICIENT of smokestack to pipe row, s
1Be the pipe transverse pitch, τ is the radiation penetrance;
Definition calculates the ascent of each comb according to ascent;
Step 3.3A, the result who calculates to step 3.3A according to step 3.1A set up the segmentation computation model;
Step 3.5A, calculate the flow of each sheet screen:
Wherein, g
iFor calculating the flow of tube panel, g
0Be the flow of average discharge tube panel, Δ P
iBe each screen pressure reduction, Δ P
0Be average pressure reduction;
The flow through enthalpy of pipeline section of step 3.6A, working medium increases to:
Wherein, K
1Be thermal deviation coefficient along the flue width; K
4Be thermal deviation coefficient along the screen height; E
0Area conversion factor for intermediate tube; l
aBe length of pipe section; D is a tube outer diameter; D
iThe flow of-calculating pipeloop; P
1And P
2Be respectively bottom smokestack radiation factor and anterior smokestack radiation factor; q
F1And q
F2Be respectively bottom smokestack and anterior smokestack radiant heat load; q
pFor the screen between flue gas to the screen radiation and the thermic load of convection heat transfer; ξ
1Heating surface deviation factor for pipeline section.
3. a kind of station boiler finishing superheater as claimed in claim 1 and final reheater intelligence wall temperature management method is characterized in that the calculation procedure of each calculation level tube wall temperature is described in the step 3::
Step 3.1B, tube wall metal temperature are:
The tube wall outside wall temperature is:
Wherein, t
qBe vapor (steam) temperature in the calculation level pipe, β is a tube outer diameter and the ratio of internal diameter, and μ is a coefficient of heat transfer, and δ is the pipe wall thickness, and q is a calculation level pipe heat absorption load, and λ is the thermal conductivity factor of tube wall metal, α
2Exothermic coefficient for steam side;
Step 3.2B, calculating pipe heat absorption load:
Wherein,
Be calculation level flue-gas temperature, α
1Be calculation level fume side coefficient of convective heat transfer, α
3Be calculation level gas radiation exothermic coefficient, ε is the contamination factor of calculation level pipe.
4. a kind of station boiler finishing superheater as claimed in claim 1 and final reheater intelligence wall temperature management method, it is characterized in that, the method that each screen of described statistics finishing superheater of step 4 and final reheater is respectively managed the historical temperature data distribution of each calculation level is: set up historical data segmentation summary sheet in database side, the corresponding record of each calculation level, each record is gone up temperature is carried out the segmentation statistics, with 2 degrees centigrade is the interval, add up the Cumulative Elapsed Time of each calculation level segmentation temperature, when the Practical Calculation temperature is in the middle of two waypoint Temperature numerical, add up this calculation level tube wall temperature running time with less waypoint temperature.
5. a kind of station boiler finishing superheater as claimed in claim 4 and final reheater intelligence wall temperature management method, it is characterized in that, the computational methods of the overheating operation time of described each calculation level of step 4 are: the maximum that various tubing are set allows running temperature, respectively manage the Cumulative Elapsed Time and the corresponding segments point temperature of each segmentation temperature of each calculation level then according to each screen in the historical data base, accumulation calculating obtains the overheating operation time that each screen is respectively managed each calculation level.
6. a kind of station boiler finishing superheater as claimed in claim 1 and final reheater intelligence wall temperature management method is characterized in that step 5 comprises:
Step 5.1, import the real time access database, show the tube wall temperature of relevant position in the stove,, judge whether overtemperature of tube wall temperature according to the maximum allowable temperature of this position tubing according to the user; The vapor (steam) temperature that shows relevant position in the stove according to the maximum allowable temperature of this position vapor (steam) temperature in the stove, is judged whether overtemperature of vapor (steam) temperature;
Step 5.2, import according to the user and to show between corresponding screen vapor (steam) temperature between tube wall temperature, screen;
Step 5.3, import the tubing running temperature segmentation statistical information that shows the relevant position according to the user;
Step 5.4, import the overtemperature information that statistics has been finished in demonstration according to the user;
Step 5.5, according to the overtemperature information of user input and tubing, the material of overtemperature time and tubing generates the maintenance suggestion of boiler operatiopn, shows the suggestion of changing tubing to estimating and make the service life of particular location tubing;
Step 5.6, the load of boiler operatiopn is added up according to user input, the running time of each load section that 90% load at the line computation boiler is above, 80%-90% load, 70%-80% load, 60%-70% load, 50%-60% load, 50% load are following, and generation daily sheet, weekly return and the moon form.
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| CN103574589A (en) * | 2013-10-31 | 2014-02-12 | 广东电网公司电力科学研究院 | Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler |
| CN103574579A (en) * | 2013-10-31 | 2014-02-12 | 广东电网公司电力科学研究院 | Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler |
| CN103574579B (en) * | 2013-10-31 | 2015-06-24 | 广东电网公司电力科学研究院 | Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler |
| CN103574589B (en) * | 2013-10-31 | 2015-07-22 | 广东电网公司电力科学研究院 | Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler |
| CN104913291A (en) * | 2015-06-02 | 2015-09-16 | 华北电力科学研究院有限责任公司 | Method for detecting wall temperature of steam heating surface of boiler |
| CN106594701A (en) * | 2016-10-12 | 2017-04-26 | 中电投电力工程有限公司 | Boiler temperature monitoring and measuring point arrangement method |
| CN107490000A (en) * | 2017-08-28 | 2017-12-19 | 北京航空航天大学 | The wall temperature monitoring method and system at a kind of Dissimilar Metal Joints In Power Boilers position |
| CN107490000B (en) * | 2017-08-28 | 2019-03-08 | 北京航空航天大学 | A kind of the wall temperature monitoring method and system at Dissimilar Metal Joints In Power Boilers position |
| CN110848731A (en) * | 2019-11-21 | 2020-02-28 | 华能罗源发电有限责任公司 | Ultra-supercritical tower boiler high-temperature heating surface pipe wall temperature measuring system |
| CN113757637A (en) * | 2021-07-29 | 2021-12-07 | 华能(浙江)能源开发有限公司玉环分公司 | Early warning method for wall temperature of boiler superheater |
| CN114088138A (en) * | 2021-10-30 | 2022-02-25 | 国家能源集团华北电力有限公司廊坊热电厂 | Power plant over-temperature and over-pressure monitoring system based on measuring points |
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