CN105043689B - Method and device for determining air leakage rate of air pre-heater - Google Patents
Method and device for determining air leakage rate of air pre-heater Download PDFInfo
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- CN105043689B CN105043689B CN201510353805.9A CN201510353805A CN105043689B CN 105043689 B CN105043689 B CN 105043689B CN 201510353805 A CN201510353805 A CN 201510353805A CN 105043689 B CN105043689 B CN 105043689B
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- 238000000034 method Methods 0.000 title claims abstract description 47
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000001301 oxygen Substances 0.000 claims abstract description 74
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 74
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000003546 flue gas Substances 0.000 claims abstract description 69
- 239000007789 gas Substances 0.000 claims abstract description 23
- 235000019504 cigarettes Nutrition 0.000 claims description 43
- 238000005259 measurement Methods 0.000 claims description 22
- 238000010586 diagram Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 13
- 238000004590 computer program Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- ISSXKNWTCLRPJY-UHFFFAOYSA-N O.O.[O-2].[Zr+4].[O-2] Chemical compound O.O.[O-2].[Zr+4].[O-2] ISSXKNWTCLRPJY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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Abstract
The invention discloses a method and device for determining the air leakage rate of an air pre-heater. The air pre-heater is dual-chamber air pre-heater or four-chamber air pre-heater. The method comprises: acquiring the inlet average oxygen content of the air pre-heater; determining an outlet excess air coefficient of the air pre-heater according to the inlet average oxygen content of the air pre-heater; determining an inlet excess air coefficient of the air pre-heater according to the outlet excess air coefficient of the air pre-heater; determining the leakage-free outlet flue gas temperature of the air pre-heater according to the inlet flue gas temperature of the air pre-heater, the outlet primary air temperature of the air pre-heater, the outlet secondary air temperature of the air pre-heater, the inlet primary air temperature of the air pre-heater, and the inlet secondary air temperature of the air pre-heater; determining the flue gas air leakage temperature of the air pre-heater according to secondary air temperature; determining the outlet air leakage coefficient increment of the air pre-heater according to the leakage-free outlet flue gas temperature of the air pre-heater, a real boiler exhaust gas temperature, and the flue gas air leakage temperature of the air pre-heater; and determining the air leakage rate of the air pre-heater according to the outlet air leakage coefficient increment of the air pre-heater and the inlet excess air coefficient of the air pre-heater. The method and the device may accurately acquire the air leakage rate of the air pre-heater.
Description
Technical field
The present invention relates to boiler technology field, more particularly to air preheater air leakage rate determines method and device.
Background technology
Air preheater (air pre-heater) is that the flue gas in boiler back end ductwork will be entered by internal fin
Enter the air preheat before boiler to the heating surface of uniform temperature, for improving the heat exchange performance of boiler, reduce energy ezpenditure, one
As referred to as air preheater.
Air preheater is the main auxiliary equipment of coal-fired station, and the method that air preheater air leakage rate can pass through test is true
It is fixed.Flue gas side outlet, entrance arrange very close measuring point by gridding method when determining air preheater air leakage rate, add by flow after measurement oxygen amount
Weight average calculates the oxygen amount that comes in and goes out, and is calculated with formula (1).
Wherein, αLFor air preheater air leakage rate；O2LvFor air preheater entrance oxygen amount, O2EnOxygen amount, α are exported for air preheater2It is pre- for sky
Device exports excess air coefficient；α1For air preheater entrance excess air coefficient.
Gridding method is the method for gathering flue gas sample in station boiler flue, using during the method in rectangle or circle
Equal-area method is pressed on the cross section of shape flue and arranges multiple measuring points, respectively in each point position collection flue gas sample, again finally
Weighted average is taken to the measurement result of all measuring points.For rectangular flue, the typically a line in flue cross section is first-class
Spacing opens up row's gaging hole, and at each gaging hole different depth measuring point is equally spacedly arranged.According to the regulation of professional standard, mesh point
Spacing be generally 0.6m～1m or so.
During using grid survey oxygen amount, the smoke components distribution of air preheater entry position is relatively uniform, but in outlet
Position, because the pressure differential of exhaust gases passes both sides has greatly difference, thus inleakage difference is very big, causes exiting flue gas composition difference
Very big, the oxygen amount degree of accuracy of measurement is relatively low.
Prior art is further contemplated using Oxygen Measuring Instrument on-line measurement air preheater entrance oxygen amount O2LvWith outlet oxygen amount
O2En, the air leak rate of air curtain of air preheater is then directly calculated according to formula (1).When on-line measurement is using oxidation zirconium measurement oxygen amount, oxidation
The limited length of zirconium head, typically not over 2m, the live measurement in order to increase air preheater air leakage rate is typically exported in air preheater
Three zirconium oxide measuring points are installed.But due to the inhomogeneities of oxygen amount at this, if there is the high oxygen amount air-flow of a local at measuring point,
Or the high tolerance air-flow of this local is not detected, can all cause huge deviation.
The content of the invention
The embodiment of the present invention provides a kind of air preheater air leakage rate and determines method, more accurately to obtain air preheater air leakage
Rate, the air preheater is two points of storehouse air preheaters or four points of storehouse air preheaters, and methods described includes：
Obtain the average oxygen amount of air preheater entrance；
According to the average oxygen amount of air preheater entrance, determine that air preheater exports excess air coefficient；
Excess air coefficient is exported according to air preheater, air preheater entrance excess air coefficient is determined；
Air temperature, air preheater outlet Secondary Air temperature, an air preheater are exported according to air preheater inlet flue gas temperature, air preheater to enter
Air temperature of mouth and air preheater entrance Secondary Air temperature, determine air preheater without outlet cigarette temperature of leaking out；
According to Secondary Air temperature, determine that air preheater flue gas leaks out temperature；
Leaked out temperature without outlet cigarette temperature of leaking out, boiler actual exhaust gas temperature and air preheater flue gas according to air preheater as follows
Degree, determines that air preheater exports air leakage coefficient incrementss：
Wherein, Δ α is that air preheater exports air leakage coefficient incrementss；θNLIt is that air preheater exports cigarette temperature without leaking out；θ2For boiler
Actual exhaust gas temperature；tLLeak out temperature for air preheater flue gas；cpAFor the specific heat of air；cpGFor the specific heat of flue gas；
Air leakage coefficient incrementss and air preheater entrance excess air coefficient are exported according to air preheater, air preheater air leakage is determined
Rate.
The embodiment of the present invention also provides a kind of air preheater air leakage rate determining device, more accurately to obtain air preheater leakage
Wind rate, the air preheater is two points of storehouse air preheaters or four points of storehouse air preheaters, and described device includes：
The average oxygen amount of entrance obtains module, for obtaining the average oxygen amount of air preheater entrance；
Outlet excess air coefficient determining module, for according to the average oxygen amount of air preheater entrance, determining that air preheater goes out to make a slip of the tongue
Amount air coefficient；
Entrance excess air coefficient determining module, for exporting excess air coefficient according to air preheater, determines that air preheater enters
Mouth excess air coefficient；
Without outlet cigarette temperature determining module of leaking out, for exporting air temperature, a sky according to air preheater inlet flue gas temperature, air preheater
Pre- device outlet Secondary Air temperature, air temperature of air preheater entrance and air preheater entrance Secondary Air temperature, determine air preheater without leakage
Wind exports cigarette temperature；
Flue gas leaks out temperature determination module, for according to Secondary Air temperature, determining that air preheater flue gas leaks out temperature；
Outlet air leakage coefficient incrementss determining module, for as follows according to air preheater without outlet cigarette temperature, the pot of leaking out
Stove actual exhaust gas temperature and air preheater flue gas leak out temperature, determine that air preheater exports air leakage coefficient incrementss：
Wherein, Δ α is that air preheater exports air leakage coefficient incrementss；θNLIt is that air preheater exports cigarette temperature without leaking out；θ2For boiler
Actual exhaust gas temperature；tLLeak out temperature for air preheater flue gas；cpAFor the specific heat of air；cpGFor the specific heat of flue gas；
Air leak rate of air curtain determining module, for exporting air leakage coefficient incrementss and air preheater entrance excess air system according to air preheater
Number, determines air preheater air leakage rate.
In the embodiment of the present invention, air preheater air leakage rate exports air leakage coefficient incrementss according to air preheater and air preheater enters to make a slip of the tongue
Amount air coefficient determines that wherein air preheater outlet air leakage coefficient incrementss and air preheater entrance excess air coefficient are in determination process
In export oxygen amount without using air preheater, therefore the embodiment of the present invention need not be measured using gridding method or Oxygen Measuring Instrument
Air preheater exports oxygen amount, it is to avoid high level error and air preheater that measurement brings export the arrangement of oxygen amount measuring point, are obtained in that more
Accurate air preheater air leakage rate.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.In the accompanying drawings：
Fig. 1 is the schematic diagram that air preheater air leak rate of air curtain determines method in the embodiment of the present invention；
Fig. 2 is the schematic diagram of two points of storehouse air preheaters in the embodiment of the present invention；
Fig. 3 is the schematic diagram of four points of storehouse air preheaters in the embodiment of the present invention；
Fig. 4 is the schematic diagram of air preheater air leak rate of air curtain determining device in the embodiment of the present invention.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention becomes more apparent, below in conjunction with the accompanying drawings to this
Bright embodiment is described in further details.Here, the schematic description and description of the present invention is used to explain the present invention, but and
It is not as a limitation of the invention.
Fig. 1 is the schematic diagram that air preheater air leak rate of air curtain determines method in the embodiment of the present invention.As shown in figure 1, the present invention is implemented
Air preheater air leak rate of air curtain determines that method can include in example：
Step 101, the average oxygen amount of acquisition air preheater entrance；
Step 102, according to the average oxygen amount of air preheater entrance, determine air preheater export excess air coefficient；
Step 103, according to air preheater export excess air coefficient, determine air preheater entrance excess air coefficient；
Step 104, exported according to air preheater inlet flue gas temperature, air preheater air temperature, air preheater outlet Secondary Air temperature,
Air temperature of air preheater entrance and air preheater entrance Secondary Air temperature, determine air preheater without outlet cigarette temperature of leaking out；
Step 105, according to Secondary Air temperature, determine that air preheater flue gas leaks out temperature；
Step 106, leaked out temperature without outlet cigarette temperature of leaking out, boiler actual exhaust gas temperature and air preheater flue gas according to air preheater
Degree, determines that air preheater exports air leakage coefficient incrementss；
Step 107, air leakage coefficient incrementss and air preheater entrance excess air coefficient are exported according to air preheater, it is determined that empty pre-
Device air leak rate of air curtain；Air preheater wherein in the embodiment of the present invention is two points of storehouse air preheaters or four points of storehouse air preheaters.
As shown in Figure 1 flow process is it is known that in the embodiment of the present invention, air preheater air leakage rate is leaked out according to air preheater outlet and is
Number incrementss and air preheater entrance excess air coefficient determine that wherein air preheater exports air leakage coefficient incrementss and air preheater entrance
Excess air coefficient exports oxygen amount in determination process without using air preheater, therefore the embodiment of the present invention need not adopt gridding method
Or Oxygen Measuring Instrument measurement air preheater outlet oxygen amount, it is to avoid the high level error and air preheater outlet oxygen amount that measurement brings is surveyed
The arrangement of point, is obtained in that more accurate air preheater air leakage rate.
The embodiment of the present invention mainly according to air preheater air leakage rate and primary and secondary air running temperature and thermal balance relation of leaking out,
To determine air preheater air leakage rate.In embodiment, the average oxygen amount of air preheater entrance is first obtained.For example can be obtained using grid survey
Obtain the average oxygen amount of air preheater entrance；Or, it is possible to use it is average that Oxygen Measuring Instrument on-line measurement obtains air preheater entrance
Oxygen amount.Because the smoke components distribution in air preheater entry position is relatively uniform, not only again can be sharp using grid survey oxygen amount
With Oxygen Measuring Instrument on-line measurement oxygen amount, two methods measurement result is very accurate, but needs measurement using gridding method
Personnel take instrument and remove in-site measurement, if realizing entrance oxygen amount on-line measurement using Oxygen Measuring Instrument, air leak rate of air curtain is again
Can directly calculate, calculate result and directly display on power plant's computer, so that it may realize On-line sampling system air leak rate of air curtain, tester
Scene need not be gone to, man power and material is so just saved.
In embodiment, after the average oxygen amount of air preheater entrance is obtained, can be according to the average oxygen amount of air preheater entrance, it is determined that empty
Pre- device exports excess air coefficient, and further according to air preheater excess air coefficient is exported, and determines air preheater entrance excess air coefficient.
Wherein air preheater outlet excess air coefficient is determined and according to the excessive sky of air preheater outlet according to the average oxygen amount of air preheater entrance
Gas coefficient determines that the method for air preheater entrance excess air coefficient can have various, for example：
As follows according to the average oxygen amount of air preheater entrance, determine that air preheater exports excess air coefficient：
Wherein, α2Excess air coefficient is exported for air preheater, O is the average oxygen amount of air preheater entrance；
As follows excess air coefficient is exported according to air preheater, determine air preheater entrance excess air coefficient：
α1=α2-∑Δα′；
Wherein, α1For air preheater entrance excess air coefficient, Δ α ' be boiler under rated load in addition to air preheater
Other local air leak rate of air curtain such as other places, such as pipeline.
When being embodied as, always according to air preheater inlet flue gas temperature, air preheater air temperature, an air preheater outlet Secondary Air are exported
Temperature, air temperature of air preheater entrance and air preheater entrance Secondary Air temperature, determine air preheater without outlet cigarette temperature of leaking out.Specifically
, when it is determined that air preheater exports cigarette temperature without leaking out, can be combined with mass ratio, the ratio of air of air and flue gas in air preheater
The parameter such as heat, the specific heat of flue gas, primary air ratio and secondary air ratio is carried out.For example, can as follows according to air preheater entrance
Cigarette temperature, air preheater export air temperature, air preheater outlet Secondary Air temperature, air temperature of air preheater entrance and an air preheater and enter
Mouth Secondary Air temperature, determines air preheater without outlet cigarette temperature of leaking out：
Wherein, θNLIt is that air preheater exports cigarette temperature without leaking out；θ1For air preheater inlet flue gas temperature；κ is air and cigarette in air preheater
The mass ratio of gas；cpAFor the specific heat of air；cpGFor the specific heat of flue gas；tpraHAn air temperature is exported for air preheater；tpraCFor sky
Air temperature of pre- device entrance；tsaHSecondary Air temperature is exported for air preheater；tsaCFor air preheater entrance Secondary Air temperature；γ1For
Primary air ratio；γ2For secondary air ratio.Wherein, primary air ratio γ1Each coal pulverizer inlet air quantity sum can be taken with total air
Ratio；Secondary air ratio γ2=α1-γ1。
When being embodied as, always according to Secondary Air temperature, determine that air preheater flue gas leaks out temperature.Fig. 2 is the embodiment of the present invention
In two points of storehouse air preheaters schematic diagram；Fig. 3 is the schematic diagram of four points of storehouse air preheaters in the embodiment of the present invention.Some units are without only
Vertical primary air fan, air preheater just selects two points of storehouse air preheaters.Inventor it is considered that for two, four points of storehouse air preheaters, due to cigarette
The adjacent secondary wind cabin of gas storehouse, Secondary Air lateral pressure is larger, thus fume side leak into for Secondary Air, therefore in embodiments of the present invention
Flue gas temperature of leaking out is defined as into Secondary Air temperature, as shown in equation below：
tL=tsa；
Wherein, tLLeak out temperature for air preheater flue gas, tsaFor Secondary Air temperature.
When being embodied as, after the temperature it is determined that air preheater leaks out without the gentle air preheater flue gas of outlet cigarette that leaks out, according to empty pre-
Device leaks out temperature without outlet cigarette temperature of leaking out, boiler actual exhaust gas temperature and air preheater flue gas, determines air preheater outlet air leakage coefficient
Incrementss.Temperature determination sky is leaked out in advance without leak out outlet cigarette temperature, boiler actual exhaust gas temperature and air preheater flue gas according to air preheater
Device outlet air leakage coefficient incrementss can have various ways, for example, can as follows determine that air preheater outlet air leakage coefficient increases
Dosage：
Wherein, Δ α is that air preheater exports air leakage coefficient incrementss；θNLIt is that air preheater exports cigarette temperature without leaking out；θ2For boiler
Actual exhaust gas temperature；tLLeak out temperature for air preheater flue gas.
Finally, air leakage coefficient incrementss and air preheater entrance excess air coefficient are exported according to air preheater, determines air preheater
Air leak rate of air curtain.Determine air preheater according to air preheater outlet air leakage coefficient incrementss and air preheater entrance excess air coefficient in embodiment
Air leak rate of air curtain can have various ways, for example, can export air leakage coefficient incrementss according to air preheater as follows and air preheater enters
Mouth excess air coefficient, determines air preheater air leakage rate：
Wherein, αLFor air preheater air leakage rate；Δ α is that air preheater exports air leakage coefficient incrementss；α1For air preheater entrance excess
Air coefficient.
Based on same inventive concept, a kind of air preheater air leakage rate determining device is additionally provided in the embodiment of the present invention, it is as follows
Described in the embodiment in face.Because the principle of air preheater air leakage rate determining device solve problem determines method phase with air preheater air leakage rate
Seemingly, therefore the enforcement of air preheater air leakage rate determining device may refer to the enforcement that air preheater air leakage rate determines method, part is repeated
Repeat no more.
Fig. 4 is the schematic diagram of air preheater air leak rate of air curtain determining device in the embodiment of the present invention.As shown in figure 4, the present invention is implemented
Air preheater air leak rate of air curtain determining device can include in example：
The average oxygen amount of entrance obtains module 401, for obtaining the average oxygen amount of air preheater entrance；
Outlet excess air coefficient determining module 402, for according to the average oxygen amount of air preheater entrance, determining that air preheater is exported
Excess air coefficient；
Entrance excess air coefficient determining module 403, for exporting excess air coefficient according to air preheater, determines air preheater
Entrance excess air coefficient；
Without outlet cigarette temperature determining module 404 of leaking out, for exporting a wind-warm syndrome according to air preheater inlet flue gas temperature, air preheater
Degree, air preheater outlet Secondary Air temperature, air temperature of air preheater entrance and air preheater entrance Secondary Air temperature, determine air preheater
Without outlet cigarette temperature of leaking out；
Flue gas leaks out temperature determination module 405, for according to Secondary Air temperature, determining that air preheater flue gas leaks out temperature；
Outlet air leakage coefficient incrementss determining module 406, for exporting cigarette temperature, the actual row of boiler without leaking out according to air preheater
Cigarette temperature and air preheater flue gas leak out temperature, determine that air preheater exports air leakage coefficient incrementss；
Air leak rate of air curtain determining module 407, for exporting air leakage coefficient incrementss and the excessive sky of air preheater entrance according to air preheater
Gas coefficient, determines air preheater air leakage rate；Air preheater therein is two points of storehouse air preheaters or four points of storehouse air preheaters.
When being embodied as, the average oxygen amount of the entrance obtains module 401 and specifically can be used for：
The average oxygen amount of air preheater entrance is obtained using grid survey；
Or, obtain the average oxygen amount of air preheater entrance using Oxygen Measuring Instrument on-line measurement.
When being embodied as, the outlet excess air coefficient determining module 402 specifically can be used for basis as follows
The average oxygen amount of air preheater entrance, determines that air preheater exports excess air coefficient：
Wherein, α2Excess air coefficient is exported for air preheater, O is the average oxygen amount of air preheater entrance；
The entrance excess air coefficient determining module 403 specifically can be used for going out to make a slip of the tongue according to air preheater as follows
Amount air coefficient, determines air preheater entrance excess air coefficient：
α1=α2-∑Δα′；
Wherein, α1For air preheater entrance excess air coefficient, Δ α ' be boiler under rated load in addition to air preheater
Other local air leak rate of air curtain.
When being embodied as, nothing outlet cigarette temperature determining module 404 of leaking out specifically can be used for as follows according to sky
Pre- device inlet flue gas temperature, air preheater export air temperature, air preheater outlet Secondary Air temperature, air temperature of air preheater entrance and
Air preheater entrance Secondary Air temperature, determines air preheater without outlet cigarette temperature of leaking out：
Wherein, θNLIt is that air preheater exports cigarette temperature without leaking out；θ1For air preheater inlet flue gas temperature；κ is air and cigarette in air preheater
The mass ratio of gas；cpAFor the specific heat of air；cpGFor the specific heat of flue gas；tpraHAn air temperature is exported for air preheater；tpraCFor sky
Air temperature of pre- device entrance；tsaHSecondary Air temperature is exported for air preheater；tsaCFor air preheater entrance Secondary Air temperature；γ1For
Primary air ratio；γ2For secondary air ratio.
When being embodied as, flue gas temperature determination module 405 of leaking out specifically can be used for as follows according to secondary
Air temperature, determines that air preheater flue gas leaks out temperature：
tL=tsa；
Wherein, tLLeak out temperature for air preheater flue gas, tsaFor Secondary Air temperature.
When being embodied as, the outlet air leakage coefficient incrementss determining module 406 specifically can be used for root as follows
Leak out temperature without outlet cigarette temperature of leaking out, boiler actual exhaust gas temperature and air preheater flue gas according to air preheater, determine that air preheater outlet is leaked
Wind coefficient incrementss：
Wherein, Δ α is that air preheater exports air leakage coefficient incrementss；θNLIt is that air preheater exports cigarette temperature without leaking out；θ2For boiler
Actual exhaust gas temperature；tLLeak out temperature for air preheater flue gas.
When being embodied as, the air leak rate of air curtain determining module 407 specifically can be used for being exported according to air preheater as follows
Air leakage coefficient incrementss and air preheater entrance excess air coefficient, determine air preheater air leakage rate：
Wherein, αLFor air preheater air leakage rate；Δ α is that air preheater exports air leakage coefficient incrementss；α1For air preheater entrance excess
Air coefficient.
In sum, in the embodiment of the present invention, air preheater air leakage rate exports air leakage coefficient incrementss and sky according to air preheater
Pre- device entrance excess air coefficient determines that wherein air preheater exports air leakage coefficient incrementss and air preheater entrance excess air coefficient
Oxygen amount is exported without using air preheater in determination process, therefore the embodiment of the present invention need not be using gridding method or zirconium oxide oxygen amount
Analyzer measurement air preheater outlet oxygen amount, it is to avoid high level error and air preheater that measurement brings export the arrangement of oxygen amount measuring point, energy
It is enough to obtain more accurate air preheater air leakage rate.
Further, it is possible to use Oxygen Measuring Instrument on-line measurement obtains the average oxygen amount of air preheater entrance, can be with
On-line sampling system air leak rate of air curtain is realized, tester need not go to scene, so just save man power and material.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using complete hardware embodiment, complete software embodiment or with reference to the reality in terms of software and hardware
Apply the form of example.And, the present invention can be adopted and wherein include the computer of computer usable program code at one or more
The computer program implemented in usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) is produced
The form of product.
The present invention is the flow process with reference to method according to embodiments of the present invention, equipment (system) and computer program
Figure and/or block diagram are describing.It should be understood that can be by computer program instructions flowchart and/or each stream in block diagram
The combination of journey and/or square frame and flow chart and/or the flow process in block diagram and/or square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced for reality by the instruction of computer or the computing device of other programmable data processing devices
The device of the function of specifying in present one flow process of flow chart or one square frame of multiple flow processs and/or block diagram or multiple square frames.
These computer program instructions may be alternatively stored in can guide computer or other programmable data processing devices with spy
In determining the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory is produced to be included referring to
Make the manufacture of device, the command device realize in one flow process of flow chart or one square frame of multiple flow processs and/or block diagram or
The function of specifying in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented process, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow process of flow chart or multiple flow processs and/or block diagram one
The step of function of specifying in individual square frame or multiple square frames.
Particular embodiments described above, has been carried out further in detail to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail it is bright, should be understood that the foregoing is only the present invention specific embodiment, the guarantor being not intended to limit the present invention
Shield scope, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc., should be included in this
Within the protection domain of invention.
Claims (12)
1. a kind of air preheater air leakage rate determines method, it is characterised in that the air preheater is two points of storehouse air preheaters or four points of storehouse skies
Pre- device, methods described includes：
Obtain the average oxygen amount of air preheater entrance；
According to the average oxygen amount of air preheater entrance, determine that air preheater exports excess air coefficient；
Excess air coefficient is exported according to air preheater, air preheater entrance excess air coefficient is determined；
Air temperature, air preheater outlet Secondary Air temperature, an air preheater entrance one are exported according to air preheater inlet flue gas temperature, air preheater
Secondary air temperature and air preheater entrance Secondary Air temperature, determine air preheater without outlet cigarette temperature of leaking out；
According to Secondary Air temperature, determine that air preheater flue gas leaks out temperature；
Leaked out temperature without outlet cigarette temperature of leaking out, boiler actual exhaust gas temperature and air preheater flue gas according to air preheater as follows,
Determine that air preheater exports air leakage coefficient incrementss：
Wherein, Δ α is that air preheater exports air leakage coefficient incrementss；θNLIt is that air preheater exports cigarette temperature without leaking out；θ2For boiler reality
Exhaust gas temperature；tLLeak out temperature for air preheater flue gas；cpAFor the specific heat of air；cpGFor the specific heat of flue gas；
Air leakage coefficient incrementss and air preheater entrance excess air coefficient are exported according to air preheater, air preheater air leakage rate is determined.
2. the method for claim 1, it is characterised in that the average oxygen amount of the acquisition air preheater entrance, including：
The average oxygen amount of air preheater entrance is obtained using grid survey；
Or, obtain the average oxygen amount of air preheater entrance using Oxygen Measuring Instrument on-line measurement.
3. the method for claim 1, it is characterised in that as follows according to the average oxygen amount of air preheater entrance, it is determined that
Air preheater exports excess air coefficient：
Wherein, α2Excess air coefficient is exported for air preheater, O is the average oxygen amount of air preheater entrance；
As follows excess air coefficient is exported according to air preheater, determine air preheater entrance excess air coefficient：
α1=α2-ΣΔα′；
Wherein, α1For air preheater entrance excess air coefficient, Δ α ' is other ground of boiler under rated load in addition to air preheater
The air leak rate of air curtain of side.
4. the method for claim 1, it is characterised in that gone out according to air preheater inlet flue gas temperature, air preheater as follows
Air temperature of mouth, air preheater outlet Secondary Air temperature, air temperature of air preheater entrance and air preheater entrance Secondary Air temperature,
Determine air preheater without outlet cigarette temperature of leaking out：
Wherein, θNLIt is that air preheater exports cigarette temperature without leaking out；θ1For air preheater inlet flue gas temperature；κ is air and flue gas in air preheater
Mass ratio；tpraHAn air temperature is exported for air preheater；tpraCFor air temperature of air preheater entrance；tsaHFor air preheater outlet two
Secondary air temperature；tsaCFor air preheater entrance Secondary Air temperature；γ1For primary air ratio；γ2For secondary air ratio.
5. the method for claim 1, it is characterised in that as follows according to Secondary Air temperature, determine air preheater cigarette
Gas leaks out temperature：
tL=tsa；
Wherein, tLLeak out temperature for air preheater flue gas, tsaFor Secondary Air temperature.
6. the method for claim 1, it is characterised in that as follows air leakage coefficient incrementss are exported according to air preheater
With air preheater entrance excess air coefficient, air preheater air leakage rate is determined：
Wherein, αLFor air preheater air leakage rate；Δ α is that air preheater exports air leakage coefficient incrementss；α1For air preheater entrance excess air
Coefficient.
7. a kind of air preheater air leakage rate determining device, it is characterised in that the air preheater is two points of storehouse air preheaters or four points of storehouse skies
Pre- device, described device includes：
The average oxygen amount of entrance obtains module, for obtaining the average oxygen amount of air preheater entrance；
Outlet excess air coefficient determining module, for according to the average oxygen amount of air preheater entrance, determining that air preheater outlet is excessive empty
Gas coefficient；
Entrance excess air coefficient determining module, for exporting excess air coefficient according to air preheater, determines that air preheater enters to make a slip of the tongue
Amount air coefficient；
Without outlet cigarette temperature determining module of leaking out, for exporting air temperature, an air preheater according to air preheater inlet flue gas temperature, air preheater
Outlet Secondary Air temperature, air temperature of air preheater entrance and air preheater entrance Secondary Air temperature, determine air preheater without leaking out
Mouth cigarette temperature；
Flue gas leaks out temperature determination module, for according to Secondary Air temperature, determining that air preheater flue gas leaks out temperature；
Outlet air leakage coefficient incrementss determining module, for as follows according to air preheater without outlet cigarette temperature, the boiler reality of leaking out
Border exhaust gas temperature and air preheater flue gas leak out temperature, determine that air preheater exports air leakage coefficient incrementss：
Wherein, Δ α is that air preheater exports air leakage coefficient incrementss；θNLIt is that air preheater exports cigarette temperature without leaking out；θ2For boiler reality
Exhaust gas temperature；tLLeak out temperature for air preheater flue gas；cpAFor the specific heat of air；cpGFor the specific heat of flue gas；
Air leak rate of air curtain determining module, for exporting air leakage coefficient incrementss and air preheater entrance excess air coefficient according to air preheater,
Determine air preheater air leakage rate.
8. device as claimed in claim 7, it is characterised in that the average oxygen amount of the entrance obtain module specifically for：
The average oxygen amount of air preheater entrance is obtained using grid survey；
Or, obtain the average oxygen amount of air preheater entrance using Oxygen Measuring Instrument on-line measurement.
9. device as claimed in claim 7, it is characterised in that the outlet excess air coefficient determining module is specifically for pressing
Equation below determines that air preheater exports excess air coefficient according to the average oxygen amount of air preheater entrance：
Wherein, α2Excess air coefficient is exported for air preheater, O is the average oxygen amount of air preheater entrance；
The entrance excess air coefficient determining module specifically for as follows according to air preheater export excess air coefficient,
Determine air preheater entrance excess air coefficient：
α1=α2-ΣΔα′；
Wherein, α1For air preheater entrance excess air coefficient, Δ α ' is other ground of boiler under rated load in addition to air preheater
The air leak rate of air curtain of side.
10. device as claimed in claim 7, it is characterised in that the nothing leak out outlet cigarette temperature determining module specifically for by
Equation below exports air temperature, air preheater outlet Secondary Air temperature, an air preheater and enters according to air preheater inlet flue gas temperature, air preheater
Air temperature of mouth and air preheater entrance Secondary Air temperature, determine air preheater without outlet cigarette temperature of leaking out：
Wherein, θNLIt is that air preheater exports cigarette temperature without leaking out；θ1For air preheater inlet flue gas temperature；κ is air and flue gas in air preheater
Mass ratio；tpraHAn air temperature is exported for air preheater；tpraCFor air temperature of air preheater entrance；tsaHFor air preheater outlet two
Secondary air temperature；tsaCFor air preheater entrance Secondary Air temperature；γ1For primary air ratio；γ2For secondary air ratio.
11. devices as claimed in claim 7, it is characterised in that the flue gas leaks out temperature determination module specifically for by such as
Lower formula determines that air preheater flue gas leaks out temperature according to Secondary Air temperature：
tL=tsa；
Wherein, tLLeak out temperature for air preheater flue gas, tsaFor Secondary Air temperature.
12. devices as claimed in claim 7, it is characterised in that the air leak rate of air curtain determining module is specifically for as follows
Air leakage coefficient incrementss and air preheater entrance excess air coefficient are exported according to air preheater, air preheater air leakage rate is determined：
Wherein, αLFor air preheater air leakage rate；Δ α is that air preheater exports air leakage coefficient incrementss；α1For air preheater entrance excess air
Coefficient.
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| CN108844589A (en) * | 2018-04-12 | 2018-11-20 | 国网天津市电力公司电力科学研究院 | A kind of boiler air preheater air leakage rate calculation method |
| CN109307573B (en) * | 2018-09-26 | 2021-06-29 | 国网河北省电力有限公司电力科学研究院 | Air leakage rate testing method for air preheater |
| CN110223007B (en) * | 2019-07-05 | 2023-08-25 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Calculation method for air leakage rate of boiler furnace |
| CN113203296B (en) * | 2021-04-26 | 2023-11-10 | 辽宁科技大学 | Online monitoring method for flue air leakage of steel rolling heating furnace |
| CN114397069B (en) * | 2022-01-05 | 2024-02-02 | 华北电力科学研究院有限责任公司 | Method and device for determining air leakage rate of air preheater with two bins |
| CN114414163B (en) * | 2022-01-05 | 2024-02-02 | 华北电力科学研究院有限责任公司 | Method and device for determining air leakage rate of air preheater with three bins |
| CN114509221B (en) * | 2022-01-06 | 2024-04-09 | 首钢京唐钢铁联合有限责任公司 | Heating cover sealing evaluation method, combustion air correction method and device |
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