CN103791515A - Hearth outlet smoke temperature on-line soft-measurement system of coal-fired boiler - Google Patents
Hearth outlet smoke temperature on-line soft-measurement system of coal-fired boiler Download PDFInfo
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- CN103791515A CN103791515A CN201410056651.2A CN201410056651A CN103791515A CN 103791515 A CN103791515 A CN 103791515A CN 201410056651 A CN201410056651 A CN 201410056651A CN 103791515 A CN103791515 A CN 103791515A
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- 238000005259 measurement Methods 0.000 title claims abstract description 19
- 239000000779 smoke Substances 0.000 title abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 76
- 239000003546 flue gas Substances 0.000 claims description 76
- 239000007789 gas Substances 0.000 claims description 31
- 239000003245 coal Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 26
- 235000019504 cigarettes Nutrition 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000003517 fume Substances 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 6
- 239000000284 extract Substances 0.000 claims description 6
- 238000000205 computational method Methods 0.000 claims description 5
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- 238000002485 combustion reaction Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000013332 literature search Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003333 near-infrared imaging Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
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- 239000007795 chemical reaction product Substances 0.000 description 1
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Abstract
The invention discloses a hearth outlet smoke temperature on-line soft-measurement system of a coal-fired boiler and a measurement method of the hearth outlet smoke temperature on-line soft-measurement system. The measurement method comprises the following steps that (a) a smoke physical property parameter module is built; (b) a working medium lateral heat-absorption module and a low-temperature area outlet smoke enthalpy value module are built; (c) a hearth outlet smoke enthalpy value is obtained according to the step (a) and the step (b), and the hearth outlet smoke temperature is worked out. The hearth outlet smoke temperature on-line soft-measurement system of the coal-fired boiler and the measurement method of the hearth outlet smoke temperature on-line soft-measurement system can continuously monitor the average temperature of an outlet fracture surface of a hearth on line, and are easy to operate, small in investment of additional hardware and suitable for various boiler types.
Description
Technical field
The present invention relates to computer monitoring technical field, relate in particular to a kind of flue gas temperature of hearth outlet online soft sensor system of coal-burning boiler.
Background technology
At present, fossil-fired unit is along with the increase of capacity, and its structure becomes increasingly complex, and the parameter of required detection and control is also more and more, gives and controls and optimize and brought new problem.Coal-burning boiler burner hearth exit gas temperature online soft sensor system is for large-sized station boiler furnace outlet section temperature distribution measuring.Outlet Section is the outlet smokestack that is positioned at boiler horizontal gas pass, and it is different that tangential combustion, opposed firing mode, front wall firing mode and W flame combustion mode export the position of smokestack.
Furnace outlet is the separation of boiler radiation heat transfer and heat convection, and its exit gas temperature has a direct impact high temperature section steam parameter.Because flue gas temperature of hearth outlet is higher, and contain a large amount of dusts, work under bad environment, unit is general set temperature measuring point not at this place.And the total input heat of combustion system, burner hearth physical dimension, burner hearth, the factor such as quantity and layout of soot blower for boiler hearth will affect cigarette temperature, when boiler operatiopn, excessive air amount, burner hearth are stained situation, burner and coal pulverizer and are cut factors such as throwing combination, ature of coal and also will affect cigarette temperature.If be subject to the impact of above-mentioned certain factor, when furnace outlet gas temperature off-design value, will affect security and the economy of boiler operatiopn.In the situation that cannot predicting flue gas temperature of hearth outlet variation, cause not in time the problem such as steam and metallic walls overtemperature for preventing from adjusting, many units operate under lower steam parameter for a long time, or use a large amount of desuperheating waters, make unit economy variation.Carbonated drink side relatively, fume side belongs to fast change process.If can predict in advance the variation of flue gas temperature of hearth outlet, make automatic control system or operations staff have time enough adjustment burning operational factor, can make vapor (steam) temperature operate in higher trouble free service interval.
In prior art, conventionally comprise two different developing direction of hard ware measure and soft measurement.
The physical measurement device of existing furnace outlet gas temperature comprises heat radiation pyrometer, acoustics pyrometer etc.Through existing literature search is found, patent documentation " boiler furnace outlet smoke temperature on-line monitoring system " (notification number CN201532256U), a kind of boiler furnace outlet smoke temperature on-line monitoring system is disclosed, near being included in boiler smokestack, arrange that target is for temperature-sensitive, at horizontal flue, near infrared imaging instrument is installed and is used for gathering target emittance, and installation data computer process near infrared imaging instrument gather data, carry out the drafting of section temperature distribution curve.The application of sound wave temp measuring system has been introduced in " burner hearth sound wave temp measuring system is in the 1000MW of Ninghai power plant ultra-supercritical boiler business application " in " automation review ", that outside near the furnace wall of vertical cross section boiler smokestack, acoustic emission and receiving transducer are installed in left and right sides perforate, every pair of transducer composition line testing temperature pair, measures with pulsed sound once per second; Some to forming a complicated line temperature net in real time relevant to temperature, obtain the temperature altitude matrix on temperature surfaces according to temperature net.The monitoring error of this kind of method mainly depends near pneumatic noise and sound emission boiler horizontal gas pass, is very difficult and will overcome numerous interference.These hardware units are mostly very expensive, need to increase measurement device, buy relevant software and hardware, and installation and maintenance is all very difficult.Meanwhile, the installation site of these devices is also worthy of careful study very much, because for the large space of furnace outlet, choosing which type of mounting points is also the very difficult thing of part.
Soft measurement aspect is mainly obtained furnace outlet gas temperature or obtained by numerical simulation fire box temperature field by " boiler unit heating power calculates standard method " backstepping.Through existing literature search is found, Gu Erwei odd-numbered prescription method, Du Bo Paderewski modification method, ASME method etc. have been systematically discussed in " analysis of Calculation Methods of Furnace Outlet Temperature and comparison " in " power engineering ", and analyze the pluses and minuses that compared the semi-theoretical computational methods of these several semiempiricals, to providing some foundations for the correct calculating in boiler design and operation.The Zhou Huaichun of coal combustion National Key Laboratory of the Central China University of Science and Technology proposes a kind of boiler and furnace temp is field visualized and burning monitoring technique.These methods are all often the boilers for a certain type, and mostly rely on experience, do not have generalization and real-time.
Therefore, those skilled in the art is devoted to develop a kind of online soft sensor system of coal-burning boiler burner hearth exit gas temperature, can on-line continuous monitor furnace outlet section mean temperature, can be applicable to polytype boiler, is with a wide range of applications.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide a kind of coal-burning boiler burner hearth exit gas temperature online soft sensor system, can on-line continuous monitor furnace outlet section mean temperature, and simple to operate, additional hardware less investment, is applicable to multiple boiler type.
For achieving the above object, the invention provides a kind of coal-burning boiler burner hearth exit gas temperature online soft sensor system, comprise boiler body, the warm galvanic couple of cigarette, Distributed Control System, computer, real-time ature of coal chemical examination instrument and watch-dog; Distributed Control System is connected with boiler body and transmits the trip information of boiler unit; Distributed Control System is provided with uploads interface and download interface, and download interface is connected with computer, for transmitting the trip information of boiler unit, uploads interface and is connected with computer, for transmitting the dirty data message of ash of boiler unit; The warm galvanic couple of cigarette is located at the low-temperature space outlet of the back-end ductwork of boiler body, and the warm galvanic couple of cigarette is connected with computer, for transmitting the temperature information of flue gas; The instrument of ature of coal chemical examination is in real time arranged on coal pulverizer outlet, and the instrument of ature of coal chemical examination in real time is also connected with computer, for transmitting ature of coal information; Watch-dog is connected with computer, for transmission and demonstration flue gas temperature of hearth outlet data message.
The present invention also provides a kind of measuring method based on above-mentioned measuring system, comprises the steps:
A) set up flue gas physical parameter module;
B) set up working medium side heat-absorbing model and low-temperature space outlet flue gas enthalpy module;
C) obtain furnace outlet flue gas enthalpy according to step a) and step b), and calculate flue gas temperature of hearth outlet.
Further, in step a), carry out analysis of chemical elements in coal pulverizer outlet to entering stove ature of coal, and be input in the database of computer, set up flue gas physical parameter module, for determining the physical parameter of tail flue gas.
Further, in step b), by Distributed Control System, obtain the real-time operational factor of boiler working substance side, extract the steam of boiler working substance side and the measurement parameter of water, set up working medium side heat-absorbing model.
Wherein, the measurement parameter of steam and water comprises temperature and pressure.
Further, in step b), the computational methods of setting up working medium side heat-absorbing model are: the chimney heat exchanger between furnace outlet cross section and low-temperature space outlet is divided into several heat exchange modules by flue gas flow, extract the steam of each heat exchange module and the measurement parameter of water by Distributed Control System, obtain the working medium side caloric receptivity of each heat exchange module, summation obtains working medium side caloric receptivity again, and then obtains fume side caloric receptivity.
Further, in step b), obtain real-time exit gas temperature by the warm galvanic couple of cigarette that is arranged on low-temperature space outlet, and the exit gas temperature of gained is input to computer, be combined and obtain furnace outlet flue gas enthalpy with flue gas physical parameter storehouse, set up low-temperature space outlet flue gas enthalpy module.
Further, in step c), according to working medium side heat-absorbing model and low-temperature space outlet flue gas enthalpy module, obtain current working medium side caloric receptivity and low-temperature space outlet flue gas enthalpy, by conservation of energy formula, fume side caloric receptivity and the summation of low-temperature space outlet flue gas enthalpy are obtained to furnace outlet flue gas enthalpy, and obtain flue gas temperature of hearth outlet by the temperature backstepping module in computer.
Further, in step c), the computational methods of temperature backstepping module are that iterative computation is tried to achieve flue gas temperature of hearth outlet: first suppose that flue gas temperature of hearth outlet is t ', obtain a furnace outlet flue gas enthalpy and be
and with actual enthalpy h
yl" relatively, if being less than a certain predetermined small value, its difference thinks that the flue gas temperature of hearth outlet t ' of supposition is gained; Again adjust flue gas temperature of hearth outlet according to difference if be more than or equal to a certain predetermined small value, recalculate, until obtain actual furnace outlet gas temperature.
In preferred embodiments of the present invention, a kind of measuring method of coal-burning boiler burner hearth exit gas temperature online soft sensor system is as follows: first, carry out analysis of chemical elements in coal pulverizer outlet to entering stove ature of coal, and be input in the database of computer, set up flue gas physical parameter module, determine the related property parameter of tail flue gas.Then, download the real time execution parameter of boiler from Distributed Control System by the download interface of coal-burning boiler Distributed Control System, and the chimney heat exchanger from furnace outlet cross section to low-temperature space outlet is divided into different heat exchange modules according to working medium heating procedure, and extract the working medium side steam of corresponding heat exchange module and the measurement parameter of water, obtain total working medium side caloric receptivity Q
yq.Meanwhile, by the warm galvanic couple of cigarette being installed in low-temperature space outlet, obtaining real-time exit gas temperature and be input to computer and be combined with flue gas physical parameter module and obtain low-temperature space and export the enthalpy h of flue gas
2".Finally, by conservation of energy formula h
1"=Q
yq+ h
2" can obtain furnace outlet flue gas enthalpy, and obtain flue gas temperature of hearth outlet by the temperature backstepping module in computer, watch-dog is connected with computer and shows in real time flue gas temperature of hearth outlet data message.
As can be seen here, the present invention has following technique effect:
1, the present invention can obtain furnace outlet gas temperature value by real-time online continuously, after computer obtains monitoring result, be presented on monitored picture, or it is uploaded to DCS by microcomputer interface by result, for operating personnel's concrete operations or unit cooperative control provide data basis.
2, compared with existing monitoring technology, the soft measuring system of furnace outlet gas temperature that the present invention proposes, based on Real-time data drive, has data and easily obtains, and extra hardware drops into little and the various type of furnaces is had to the advantages such as broad applicability.
Below with reference to accompanying drawing, the technique effect of design of the present invention, concrete structure and generation is described further, to understand fully object of the present invention, feature and effect.
Accompanying drawing explanation
Fig. 1 is the coal-burning boiler burner hearth exit gas temperature online soft sensor system block diagram in one embodiment of the present of invention.
Fig. 2 is the fire coal boiler fume side flow chart of an embodiment.
Fig. 3 is the result figure of certain day 24 hours working medium side draught heats of the embodiment of Fig. 2.
Fig. 4 is the result figure of certain day 24 hours low-temperature space outlet flue gas enthalpies of the embodiment of Fig. 2.
Fig. 5 is the result figure of certain day 24 hours flue gas temperature of hearth outlet of the embodiment of Fig. 2.
The specific embodiment
As shown in Figure 1, a kind of coal-burning boiler burner hearth exit gas temperature online soft sensor system, comprises boiler body 1, the warm galvanic couple 2 of cigarette, Distributed Control System 3, uploads interface 4, download interface 5, computer 6, ature of coal chemical examination instrument 7 and watch-dog 8 in real time.
Distributed Control System 3 is connected with boiler body 1 and transmits the trip information of boiler unit.Distributed Control System 3 is provided with uploads interface 4 and download interface 5; Upload interface 4 and be connected with computer 6, for transmitting the dirty data message of ash of boiler unit; Download interface 5 is connected with computer 6, for transmitting the trip information of boiler unit; .
The warm galvanic couple 2 of cigarette is located at the low-temperature space outlet of the back-end ductwork of boiler body 1, and the warm galvanic couple 2 of cigarette is connected with computer 6, for transmitting the temperature information of flue gas.The instrument 7 of ature of coal chemical examination is in real time arranged on coal pulverizer outlet, and the instrument 7 of ature of coal chemical examination in real time is also connected with computer 6, for transmitting ature of coal information.Watch-dog 8 is connected with computer 6, for transmission and demonstration flue gas temperature of hearth outlet data message.
Below, the boiler of, Natural Circulation subcritical take 300MW, resuperheat, two arch list burner hearth, " W " flame combustion mode, dry ash extraction, the coal-fired drum boiler of all steel frame suspension type is example, describes the measuring method of the coal-burning boiler burner hearth exit gas temperature online soft sensor system of the present embodiment in detail.
A kind of coal-burning boiler burner hearth exit gas temperature online soft sensor method, comprises the steps:
Step 1: carry out analysis of chemical elements in coal pulverizer outlet to entering stove ature of coal, and be input in the database of computer, set up flue gas physical parameter module, for determining the physical parameter of tail flue gas.
Step 2: by Distributed Control System, obtain the real-time operational factor of boiler working substance side, extract the steam of described boiler working substance side and the measurement parameter of water, set up working medium side heat-absorbing model.
Step 3: obtain real-time exit gas temperature by the warm galvanic couple of cigarette that is arranged on low-temperature space outlet, and the exit gas temperature of gained is input to computer, be combined and obtain furnace outlet flue gas enthalpy with flue gas physical parameter storehouse, set up low-temperature space outlet flue gas enthalpy module.
Step 4: measure the composition into stove ature of coal, and result is sent in computer, the one-tenth that obtains flue gas by flue gas physical property model is grouped into, concrete ature of coal practical measuring examples is as shown in table 1:
Table 1
| Sequence number | Project | Unit | Measured value |
| 1 | As-received carbon Car | % | 63.52 |
| 2 | As-received hydrogen Har | % | 2.09 |
| 3 | As-received oxygen Oar | % | 1.02 |
| 4 | As-received nitrogen Nar | % | 0.92 |
| 5 | As-received sulphur Sar | % | 0.69 |
| 6 | As-received ash Aar | % | 23.76 |
| 7 | As-received moisture content Mar | % | 8.0 |
| 8 | Air-dried basis moisture content Mad | % | 2.25 |
| 9 | Dry ash free basis fugitive constituent Vdaf | % | 7.35 |
| 10 | As-received low heat valve Qnet, ar | kJ/kg | 23082 |
Step 5: pass through Distributed Control System, obtain result definite sampling period of the real-time operational factor of boiler working substance side, chimney heat exchanger between furnace outlet cross section and low-temperature space outlet is divided into five heat exchange modules by flue gas flow, as shown in Figure 2, be respectively pendant superheater, high temperature superheater, high temperature reheater, horizontal reheater (low-temperature reheater), horizontal superheater (low temperature superheater), economizer, wherein horizontal superheater comprises additional steam.Process as follows to working medium side measurement parameter:
A) working medium side heat balance: Q
gz=Q
s0+ Q
s1+ Q
s2+ Q
s3+ Q
s4
B) fume side thermal discharge:
Q
s0=D
0(h
ssm″-h
ssm′)
Q
s1=D
1(h
sdg″-h
sqb′)
C) the heat exchange amount of each heat exchanger: Q
s2=D
2(h
spg" h
spg')
Q
s3=D
3(h
sgg″-h
sgg′)
Q
s4=D
4(h
szr″-h
szr′)
Q in formula
gz, Q
s0, Q
s1, Q
s2, Q
s3, Q
s4---be respectively total working medium, economizer, low temperature superheater, pendant superheater, high temperature superheater, high temperature reheater working medium caloric receptivity, kJ/s; D
0, D
1, D
2, D
3, D
4---be respectively economizer, low temperature superheater, pendant superheater, high temperature superheater, high temperature reheater flow, kg/s; h
s", h
s'---be respectively each heating surface import and export steam enthalpy, kJ/kg, and heat exchanger corresponding to the different subscripts of enthalpy;
---be errors, can be approximately 1 here; Q
yq---be fume side caloric receptivity, kJ/kg.
Above-mentioned each heat exchanger working medium enthalpy is tried to achieve in real time by modular fluid properties storehouse.Fluid properties storehouse adopts international properties of water and steam IAPWS-IF97 formula, adopts vector pattern, as input, is output as the enthalpy of water and steam from Temperature of Working, the pressure etc. of each heat exchanger Real-time Collection, is expressed as follows:
Q=IF97
Vector(T,P)
The enthalpy of Q working medium in formula, T and P are respectively the temperature and pressure of the working medium of real-time measurement.
Step 6: obtain online the tail flue gas temperature of boiler by the warm galvanic couple of boiler tail cigarette, send it to computer and process, as the input of flue gas enthalpy module, obtain exporting the enthalpy h of flue gas
ysm".
Step 7: by step 5,6 result, will export flue gas enthalpy and the summation of flue gas thermal discharge, and can obtain furnace outlet flue gas enthalpy h
yl", the kJ/kg of unit.
Step 8: in the cigarette temperature backstepping module being input in computer, iterative computation is tried to achieve furnace outlet gas temperature t by step 7 acquired results.Need the furnace outlet gas temperature of new supposition to compute repeatedly, until the enthalpy calculating
with actual enthalpy h
yl" difference be less than a certain value:
Be required end product meeting the flue gas temperature of hearth outlet obtaining under above formula condition.In said process, relate to such an extent that the computational details all carries out according to relevant heating power calculating standard method.
Step 9: the soft measurement result of cigarette temperature being obtained by step 8, Distributed Control System by boiler upload interface, result is uploaded in Distributed Control System and coordinates to control, and be transferred to by network line in the watch-dog of field control chamber, provide effective reference for operations staff to current operation.
Fig. 3～Fig. 5 is respectively and utilizes the result figure of certain day 24 hours working medium side draught heats that the measuring method of the present embodiment obtains, the result figure of low-temperature space outlet flue gas enthalpy and the result figure of flue gas temperature of hearth outlet.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just can design according to the present invention make many modifications and variations without creative work.Therefore, all technical staff in the art, all should be in by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (9)
1. a coal-burning boiler burner hearth exit gas temperature online soft sensor system, is characterized in that, comprises boiler body, the warm galvanic couple of cigarette, Distributed Control System, computer, real-time ature of coal chemical examination instrument and watch-dog;
Described Distributed Control System is connected with boiler body, for transmitting the trip information of boiler unit; Described Distributed Control System is provided with uploads interface and download interface, described download interface is connected with described computer, for transmitting the trip information of described boiler unit, described in upload interface and be connected with described computer, for transmitting the ash dirt data message of described boiler unit;
The warm galvanic couple of described cigarette is located at the low-temperature space outlet of the back-end ductwork of described boiler body, and the warm galvanic couple of described cigarette is connected with described computer, for transmitting the temperature information of flue gas;
Described real-time ature of coal chemical examination instrument is arranged on coal pulverizer outlet, and described real-time ature of coal chemical examination instrument is also connected with described computer, for transmitting ature of coal information;
Described watch-dog is connected with computer, for transmission and demonstration flue gas temperature of hearth outlet data message.
2. a measuring method for coal-burning boiler burner hearth exit gas temperature online soft sensor system as claimed in claim 1, is characterized in that, comprises the steps:
A) set up flue gas physical parameter module;
B) set up working medium side heat-absorbing model and low-temperature space outlet flue gas enthalpy module;
C) obtain furnace outlet flue gas enthalpy according to step a) and step b), and calculate flue gas temperature of hearth outlet.
3. measuring method as claimed in claim 2, is characterized in that, in step a), carry out analysis of chemical elements in coal pulverizer outlet to entering stove ature of coal, and be input in the database of computer, set up flue gas physical parameter module, for determining the physical parameter of tail flue gas.
4. measuring method as claimed in claim 2, is characterized in that, in step b), by Distributed Control System, obtains the real-time operational factor of boiler working substance side, extracts the steam of described boiler working substance side and the measurement parameter of water, sets up working medium side heat-absorbing model.
5. measuring method as claimed in claim 2, it is characterized in that, in step b), the computational methods of setting up working medium side heat-absorbing model are: the chimney heat exchanger between furnace outlet cross section and low-temperature space outlet is divided into several heat exchange modules by flue gas flow, extract the steam of each heat exchange module and the measurement parameter of water by Distributed Control System, obtain the working medium side caloric receptivity of each heat exchange module, then summation obtains working medium side caloric receptivity, and then obtain fume side caloric receptivity.
6. measuring method as claimed in claim 5, is characterized in that, the measurement parameter of described steam and water comprises temperature and pressure.
7. measuring method as claimed in claim 2, it is characterized in that, in step b), obtain real-time exit gas temperature by the warm galvanic couple of cigarette that is arranged on low-temperature space outlet, and the exit gas temperature of gained is input to computer, be combined and obtain furnace outlet flue gas enthalpy with flue gas physical parameter storehouse, set up low-temperature space outlet flue gas enthalpy module.
8. measuring method as claimed in claim 2, it is characterized in that, in step c), according to working medium side heat-absorbing model and low-temperature space outlet flue gas enthalpy module, obtain current working medium side caloric receptivity and low-temperature space outlet flue gas enthalpy, by conservation of energy formula, fume side caloric receptivity and the summation of low-temperature space outlet flue gas enthalpy are obtained to furnace outlet flue gas enthalpy, and obtain flue gas temperature of hearth outlet by the temperature backstepping module in computer.
9. measuring method as claimed in claim 2, it is characterized in that, in step c), the computational methods of described temperature backstepping module are that iterative computation is tried to achieve flue gas temperature of hearth outlet: first suppose that flue gas temperature of hearth outlet is t ', obtain a furnace outlet flue gas enthalpy and be
and with actual enthalpy h
yl" relatively, if being less than a certain predetermined small value, its difference thinks that the flue gas temperature of hearth outlet t ' of supposition is gained; Again adjust flue gas temperature of hearth outlet according to difference if be more than or equal to described a certain predetermined small value, recalculate, until obtain actual furnace outlet gas temperature.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897291A (en) * | 2015-03-30 | 2015-09-09 | 北京京能电力股份有限公司石景山热电厂 | Urea pyrolyzing furnace deposit monitoring method and system |
| CN106066208A (en) * | 2016-05-26 | 2016-11-02 | 东南大学 | A kind of device and method of coal-fired power station boiler high temperature superheater wall surface temperature on-line monitoring |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897291A (en) * | 2015-03-30 | 2015-09-09 | 北京京能电力股份有限公司石景山热电厂 | Urea pyrolyzing furnace deposit monitoring method and system |
| CN106066208A (en) * | 2016-05-26 | 2016-11-02 | 东南大学 | A kind of device and method of coal-fired power station boiler high temperature superheater wall surface temperature on-line monitoring |
| CN106066208B (en) * | 2016-05-26 | 2018-11-23 | 东南大学 | A kind of device and method of coal-fired power station boiler high temperature superheater wall surface temperature on-line monitoring |
| CN106765031A (en) * | 2017-01-23 | 2017-05-31 | 东南大学 | A kind of furnace of power-plant boilers slagging scorification Multi sectional method of real-time |
| CN106765031B (en) * | 2017-01-23 | 2019-09-03 | 东南大学 | A kind of furnace of power-plant boilers slagging Multi sectional method of real-time |
| CN111121084A (en) * | 2019-12-13 | 2020-05-08 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Boiler is mixed and is burnt inferior coal anti-coking operating system |
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