CN205049928U - Boiler water wall slagging scorification on -line monitoring system - Google Patents
Boiler water wall slagging scorification on -line monitoring system Download PDFInfo
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- CN205049928U CN205049928U CN201520657675.3U CN201520657675U CN205049928U CN 205049928 U CN205049928 U CN 205049928U CN 201520657675 U CN201520657675 U CN 201520657675U CN 205049928 U CN205049928 U CN 205049928U
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Abstract
The utility model discloses a boiler water wall slagging scorification on -line monitoring system, including setting up in the intramural a plurality of thermocouples of water -cooling, the thermocouple is connected with difference in temperature changer, difference in temperature changer is connected with current -to -voltage converter, current -to -voltage converter is connected with adc, adc is connected with central processing unit, central processing unit is connected with the information management ware, the information management ware is connected with the DAS system, central processing unit still be connected with set up in the soot blower of water -cooling wall one side. The beneficial effect of the utility model: the utility model provides a difference in temperature is than slagging scorification coefficient, can accurate audio -visual reaction water -cooling wall slagging scorification degree, only need at water -cooling wall back of the body fire side -mounting thermocouple, and the installation is simple, compares the method of installation heat flow meter in the stove, and the cost is lower, can real -time monitoring water -cooling wall slagging scorification situation, guide the operation of soot blower.
Description
Technical field
The utility model relates to monitoring system, specifically, relates to a kind of boiler water wall slagging scorification on-line monitoring system.
Background technology
In large-sized station boiler, because in burner hearth, flue-gas temperature is the highest, the fly ash granule under molten condition is not fully cooled and is just impinged upon on water-cooling wall, and constantly attachment adheres to and produces slagging scorification.In accurate eastern coal, the alkaline metal of high-load can selectivity deposit, and form the fused matter of low melting point, make generating surface become coarse, viscosity strengthens, and more easily adsorbs fly ash granule, the slagging scorification of aggravation water-cooling wall.So the boiler Slagging problem using the high-alkali coal in Xinjiang is even more serious, so that Wulumuqi Area power plant can only use accurate eastern coal to mix burning mode, mixes to burn till that this is higher, is unfavorable for the large-scale development of accurate eastern coal.So the accurate eastern coal of accurate eastern regional Thermal generation unit single fire is most economical feasible scheme.Current each electricity power group and other energy company build Large Copacity Thermal generation unit energetically in Xinjiang, are design coal mainly with the accurate eastern coal of clean burn.The method of boiler furnace generation Serious Slagging if can not achieve a solution in time, ensure the safe operation of boiler controller system, then will have a strong impact on " boundary electricity is sent outside ", " boundary coal enters Chongqing " implementation, aim at the exploitation of east, industrial zone, Hami, and the transmission of electricity of the defeated coal in Xinjiang to develop simultaneously, transmit electricity be that main energy transportation system has an immense impact on.But for the problem of water-cooling wall slagging scorification, people constantly grope solution in practice.
So, develop a kind of monitoring system that can solve the problem of water-cooling wall slagging scorification, just become the problem that insider needs solution badly.
Utility model content
For the above-mentioned technical matters in correlation technique, the utility model proposes a kind of boiler water wall slagging scorification on-line monitoring system, the problem of water-cooling wall slagging scorification can be solved.
For realizing above-mentioned technical purpose, the technical solution of the utility model is achieved in that
A kind of boiler water wall slagging scorification on-line monitoring system, comprise the some thermopairs be arranged in water-cooling wall, described thermopair is connected with temperature difference transmitter, described temperature difference transmitter is connected with current-to-voltage converter, described current-to-voltage converter is connected with analog to digital converter, described analog to digital converter is connected with central processing unit, and described central processing unit is connected with information manager, and described information manager is connected with DAS system; Described central processing unit is also connected with the soot blower being arranged at described water-cooling wall side.
The beneficial effects of the utility model: the utility model proposes Temperature Difference Ratio slagging scorification coefficient, reaction water-cooling wall slagging scorification degree that can be accurate and visual, only need install thermopair at water-cooling wall back-fire side, and install simple, compare the method for installing heat flow meter in stove, cost is lower; Monitoring water-cooling wall Slagging that can be real-time, instruct the operation of soot blower, can reduce and blow because of unreasonable the steam loss or transducer wall ' s abrasion that ash causes in the past, for power plant brings direct economic benefit, ensure the safe operation of boiler, by temperature difference ash fouling coefficient data upload to power station decentralized controller, technical data can also be provided for optimizing boiler operatiopn simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the connection diagram of the boiler water wall slagging scorification on-line monitoring system according to the utility model embodiment;
Fig. 2 is that the boiler water wall slagging scorification on-line monitoring system according to the utility model embodiment increases thermopair point position schematic diagram newly;
Fig. 3 is the SVM prediction structural drawing of the boiler water wall slagging scorification on-line monitoring system according to the utility model embodiment;
Fig. 4 is the support vector predicting machine model Establishing process figure of the boiler water wall slagging scorification on-line monitoring system according to the utility model embodiment.
1, thermopair; 2, temperature difference transmitter; 3, current-to-voltage converter; 4, analog to digital converter; 5, central processing unit; 6, information manager; 7, DAS system; 8, soot blower; 9, water-cooling wall.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of the utility model protection.
As Figure 1-4, a kind of boiler water wall slagging scorification on-line monitoring system according to the utility model embodiment, comprise the some thermopairs 1 be arranged in water-cooling wall 9, described thermopair 1 is connected with temperature difference transmitter 2, described temperature difference transmitter 2 is connected with current-to-voltage converter 3, described current-to-voltage converter 3 is connected with analog to digital converter 4, described analog to digital converter 4 is connected with central processing unit 5, described central processing unit 5 is connected with information manager 6, and described information manager 6 is connected with DAS system 7; Described central processing unit 5 is also connected with the soot blower 8 being arranged at described water-cooling wall side.
Conveniently understand technique scheme of the present utility model, below by way of in concrete use-pattern, technique scheme of the present utility model is described in detail.
When specifically using, according to boiler water wall slagging scorification on-line monitoring system described in the utility model, comprise the steps:
Step one: the temperature difference measuring water-cooling wall back-fire side fin under grey dirty slagging scorification state, and compare with the temperature difference that ash clear up water-cooling wall back-fire side fin afterwards of blowing of prediction, pass through formula
Calculate the slagging scorification coefficient of water-cooling wall slagging scorification Temperature Difference Ratio
, wherein,
for the temperature difference of water-cooling wall back-fire side fin ab 2 under the dirty slagging scorification state of ash;
for blowing the temperature difference of the rear water-cooling wall back-fire side fin ab 2 of ash cleaning;
Step 2: pass through Fourier law
Calculate actual absorption hot-fluid, wherein,
for water-cooling wall is along the hot-fluid of a, b 2 direction actual absorption,
for a, b spacing;
Step 3: above-mentioned every data are stored in the SQL database of slagging scorification monitoring system, after accumulative mass data, slagging scorification detection model is set up by described data, calculate slagging scorification coefficient, after slagging scorification coefficient exceedes predetermined value, just export and blow gray signal to central processing unit, central processing unit will blow gray signal by temperature difference transmitter, current-to-voltage converter, analog to digital converter and convert digital signal to and be sent to soot blower and carry out blowing ash manipulation;
Step 4: ash manipulation to be blown is complete, repeat step, the temperature approach of real-time water-cooling wall back-fire side fin is saved in described SQL database, read six influence factor values of load (evaporation capacity), vapor pressure, intake, coal input quantity, coal and burner operation mode simultaneously by the database of the information manager of the real-time transmission data with it under decentralized controller, be stored in described SQL database in the lump;
Step 5: pass through formula
Data in SQL database are normalized, wherein,
for sample data,
,
be respectively the maximal value in sample data and minimum value,
for the data after normalization;
Step 6: the data after normalization are divided into two groups, first group as training sample, second group as checking sample, wherein,
Set up SVM prediction model by training sample, input load (evaporation capacity), vapor pressure, intake, coal input quantity, coal and burner operation mode six influence factor values are to formula
Calculate the back-fire side temperature difference, wherein,
for parameter, and find penalty factor by the method for crossvalidation
and kernel functional parameter
, and then solve best linear regression model (LRM);
Step 7: verify supporting vector machine model by checking sample.
Wherein, concrete, under not blowing out increases new heat flow meter situation, less thermocouple assembly is used to measure the temperature difference of water-cooling wall back-fire side fin under grey dirty slagging scorification state, and with prediction out blow ash clear up after the temperature difference of back-fire side fin compare, judge the slagging scorification degree of water-cooling wall, instruct putting into operation of soot blower.
In the utility model, water-cooling wall slagging scorification degree monitoring parameter is Temperature Difference Ratio slagging scorification coefficient
:
Wherein:
for the temperature difference of water-cooling wall back-fire side fin ab 2 under the dirty slagging scorification state of ash;
for blowing the temperature difference of the rear water-cooling wall back-fire side fin ab 2 of ash cleaning;
The Fire Radiation energy of water wall absorption burner hearth, passes to intraductal working medium by tube wall metal medium.Due to the existence of hot-fluid, will inevitably in tube wall metal formation temperature gradient.By analysis of Heat Transfer and calculating, water-cooling wall slagging scorification is more serious, and the grey fouling (thermal) resistance on its surface is larger, and the radiant heat flux of water-cooling wall actual absorption is less, by Fourier law
Wherein q is the hot-fluid of water-cooling wall along a, b 2 direction actual absorption,
for a, b spacing.
A, the b point-to-point transmission temperature difference is also less, Temperature Difference Ratio slagging scorification coefficient
also more close to 0.Conversely, Temperature Difference Ratio slagging scorification coefficient
more close to 1, show the actual temperature difference of water-cooling wall more close to blowing the clean rear temperature difference of ash, the actual radiant heat flux be subject to of water-cooling wall is more close blows the radiant heat flux after ash cleaning, the clean-up performance on its surface close to the clean-up performance blown after ash cleaning, without the need to the soot blower that puts into operation.So according to the change of Temperature Difference Ratio slagging scorification coefficient between 0-1, just can judge water-cooling wall any time relative to the slagging scorification degree of blowing after ash cleaning, if exceed the standard of setting, system sends automatically blows gray signal, ensures to blow ash timely and effectively.
In sum, by means of technique scheme of the present utility model, the utility model proposes Temperature Difference Ratio slagging scorification coefficient, reaction water-cooling wall slagging scorification degree that can be accurate and visual, only need install thermopair at water-cooling wall back-fire side, installs simple, compare the method for installing heat flow meter in stove, cost is lower; Monitoring water-cooling wall Slagging that can be real-time, instruct the operation of soot blower, can reduce and blow because of unreasonable the steam loss or transducer wall ' s abrasion that ash causes in the past, for power plant brings direct economic benefit, ensure the safe operation of boiler, by temperature difference ash fouling coefficient data upload to power station decentralized controller, technical data can also be provided for optimizing boiler operatiopn simultaneously.
Continue with reference to figure 1, water-cooling wall slagging scorification monitoring system comprises platinum rhodium 10-platinum thermocouple, temperature difference transmitter, current-to-voltage converter, analog to digital converter, central processing unit, DAS system, data management system, soot-blowing control device, soot blower, the water-cooling wall back-fire side temperature difference measured by platinum rhodium 10-platinum thermocouple, heat outputting electromotive force;
Thermoelectrical potential is converted into the current signal of 4-20mA by temperature difference transmitter, the current signal of the 4-20mA that temperature difference transmitter exports by current-to-voltage converter converts the voltage signal of 0-5V to, the voltage signal of the 0-5V that current-to-voltage converter exports by analog to digital converter carries out A/D conversion and Phototube Coupling, converts digital signal to.Boiler decentralized controller is a Distributed Control System being exclusively used in boiler automatic and controlling, can the operational factor of Real-time Obtaining boiler and state.Data management system and decentralized controller shared file, by DCS data through necessarily process after stored in MIS net background data base, for other subsystem; Central processing unit, accepts through thermopair, temperature difference transmitter, current-to-voltage converter, the real time execution parameter signal that analog to digital converter temperature signal and data management system export, sets up slagging scorification monitoring model, export slagging scorification coefficient, after slagging scorification coefficient exceedes certain value, export and blow gray signal; Soot blower, accept central processing unit blow gray signal after put into operation, ejection steam, purge furnace wall cooling.
Wherein, two platinum rhodium 10-platinum rhodium type thermopair positive poles are connected together, two negative pole access DDZ-S series SBW type temperature difference transmitters, the thermoelectrical potential that this bus connection method makes two thermopairs produce is cancelled out each other, then the method ratio subtracted each other with thermometric respectively, precision is higher, and the quantity of lead-in wire and temperature difference transmitter decreases half.
The prediction of the back-fire side temperature difference under desirable clean conditions: through thermodynamic computing and fluent simplation verification, the radiant heat flux that the temperature difference and the water-cooling wall of back-fire side are subject to is directly proportional, namely relevant with the combustion position of burner hearth.Affect hearth combustion situation because of the operation mode have load (evaporation capacity), vapor pressure, intake, coal input quantity, coal also have burner.Blow after ash terminates at every turn, according to the method for the above-mentioned measurement temperature difference, the temperature approach of water-cooling wall back-fire side fin is saved in the SQL database of slagging scorification monitoring system, read the value of above-mentioned six influence factors by the database of the MIS of the real-time transmission data with it under decentralized controller simultaneously, be stored in the lump in the SQL database of monitoring system, then according to the flow process shown in figure tri-, be first normalized
Wherein
for sample data
be respectively the maximal value in sample data and minimum value
for the data after normalization
Data after normalization are divided into two groups, and as training sample, set up SVM prediction model for one group, wherein the value of six influence factors is as input parameter, and the back-fire side temperature difference is as output parameter.Select radial basis function as kernel function
Be wherein parameter, find penalty factor by the method for crossvalidation
and kernel functional parameter
, six parametric variables are mapped in the linear space of higher-dimension, as shown in Figure 4, solve best linear regression model (LRM), other one group as checking sample, check the extensive popularization performance of supporting vector machine model.So monitoring system run early stage, it is also not enough to the information exporting grey dirty situation, it needs constantly to accumulate sample data, reach a certain amount of after, forecast model is built and just can successfully be set up, the real time execution duty parameter input supporting vector machine model that then will will gather from decentralized controller, just can obtain the temperature difference that water-cooling wall corresponding under any operating mode blows the fiery lateral fin sheet of ash cleaning back, namely the water-cooling wall clean condition of the best that can reach.
Continue with reference to figure 4, respectively install 20 pairs of thermopairs at burner hearth front wall, left side wall, right-side wall water-cooling wall back-fire side, at burner hearth rear water wall back-fire side fin, 16 pairs of thermopairs are installed at place, altogether 76 pairs of thermopairs.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (1)
1. a boiler water wall slagging scorification on-line monitoring system, it is characterized in that, comprise the some thermopairs (1) be arranged in water-cooling wall (9), described thermopair (1) is connected with temperature difference transmitter (2), described temperature difference transmitter (2) is connected with current-to-voltage converter (3), described current-to-voltage converter (3) is connected with analog to digital converter (4), described analog to digital converter (4) is connected with central processing unit (5), described central processing unit (5) is connected with information manager (6), and described information manager (6) is connected with DAS system (7); Described central processing unit (5) is also connected with the soot blower (8) being arranged at described water-cooling wall side.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731847A (en) * | 2018-06-01 | 2018-11-02 | 中国神华能源股份有限公司 | Heat-flow meter, boiler and heat-flow meter detection method |
| CN112629453A (en) * | 2020-11-27 | 2021-04-09 | 北京航天计量测试技术研究所 | Ultrasonic monitoring device, system and method for ash deposition and slag bonding of water-cooled wall of coal gasifier |
| CN112649098A (en) * | 2020-11-27 | 2021-04-13 | 北京航天计量测试技术研究所 | Coal gasifier water-cooled wall deposition slagging on-line monitoring device |
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2015
- 2015-08-27 CN CN201520657675.3U patent/CN205049928U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731847A (en) * | 2018-06-01 | 2018-11-02 | 中国神华能源股份有限公司 | Heat-flow meter, boiler and heat-flow meter detection method |
| CN112629453A (en) * | 2020-11-27 | 2021-04-09 | 北京航天计量测试技术研究所 | Ultrasonic monitoring device, system and method for ash deposition and slag bonding of water-cooled wall of coal gasifier |
| CN112649098A (en) * | 2020-11-27 | 2021-04-13 | 北京航天计量测试技术研究所 | Coal gasifier water-cooled wall deposition slagging on-line monitoring device |
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