CN104807500B - The warehouse separated type air preheater method for testing performance of large-sized station boiler three - Google Patents
The warehouse separated type air preheater method for testing performance of large-sized station boiler three Download PDFInfo
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Abstract
A kind of warehouse separated type air preheater method for testing performance of large-sized station boiler three, including step：Detection obtains import and export wet flue gas measurement；Detection obtains the input gas temperature measured value of air preheater, inlet and outlet air themperature measured value, inlet and outlet flue gas pressures measured value, inlet and outlet air pressure measurement；Air leak rate of air curtain is determined according to inlet and outlet wet flue gas measurement；Determined to pass through ratio measurements of the heat capacity of air amount to flue gas thermal capacity of air preheater according to input gas temperature measured value, inlet and outlet air themperature measured value and exit gas temperature calculated value；Fume side efficiency is determined according to input gas temperature measured value, inlet air temperature measured value and exit gas temperature calculated value；Fume side flow resistance measured value is determined according to inlet and outlet flue gas pressures measured value；Air-side flow resistance is determined according to inlet and outlet air pressure measurement.The present invention adapts to the characteristics of three warehouse separated type air preheaters, and effectively the performance of three warehouse separated type air preheaters is detected and assessed.
Description
Technical field
The present invention relates to electric power network technique field, more particularly to a kind of warehouse separated type air preheater of large-sized station boiler three
Can detection method.
Background technology
With the rapid development of Power Plant in China, power station boiler air pre-heater develops into three by traditional Liang Fencang
Warehouse separated type air preheater.Up to the present, the standard for carrying out air preheater performance calculating has national standard and ASME
PTC4.3-1968 standards, because ASME PTC4.3-1968 standards consider air preheater scene operational factor off-design
The amendment of parameter, therefore air preheater performance test is carried out using ASME PTC4.3-1968 standards and gradually paid attention to.But
It is, it should be pointed out that the performance that ASME PTC4.3-1968 standards are suitable only for two warehouse separated type air preheaters calculates, right
Calculated in three warehouse separated type air preheater performances, lack corresponding calculating standard.And by being carried out to the performance of air preheater
Detection and calculating, effectively can be assessed the performance of air preheater, and air preheater can be changed accordingly
Make, to ensure air preheat performance, there is important directive significance and engineering application value, therefore, carry out three warehouse separated type air
The research of preheater performance detection scheme, it is a very urgent research work.
The content of the invention
Based on this, the purpose of the embodiment of the present invention is to provide the inspection of the warehouse separated type air preheater performance of large-sized station boiler three
Survey method, it effectively can be detected and be assessed to the performance of three warehouse separated type air preheaters.
To reach above-mentioned purpose, the embodiment of the present invention uses following technical scheme：
A kind of warehouse separated type air preheater method for testing performance of large-sized station boiler three, including step：
Detect and analyze the exiting flue gas composition of air preheater and the wet flue gas amount of each exiting flue gas composition, enter air preheater
Import smoke components and each import smoke components wet flue gas amount, obtain outlet wet flue gas measurement, import wet flue gas
Measurement；
Detect respectively the input gas temperature of air preheater, inlet air temperature, outlet air temperature, import flue gas static pressure,
Exiting flue gas static pressure, air side inlet pressure, air side outlet pressure, obtain input gas temperature measured value, inlet air temperature
Spend measured value, outlet air temperature measured value, import flue gas pressures measured value, exiting flue gas pressure measuring value, inlet air pressure
Power measured value, outlet air pressure measured value；
The air leak rate of air curtain of air preheater is determined according to outlet wet flue gas measurement, import wet flue gas measurement；
According to input gas temperature measured value, inlet air temperature measured value, outlet air temperature measured value and calculating
Exit gas temperature calculated value when obtained air preheater is without leakage, it is determined that by the heat capacity of air amount of air preheater to by empty pre-
The ratio measurements of the flue gas thermal capacity of device；
It is true according to input gas temperature measured value, inlet air temperature measured value and the exit gas temperature calculated value
Determine the fume side efficiency of air preheater；
The fume side flow resistance for determining air preheater according to import flue gas pressures measured value, exiting flue gas pressure measuring value is surveyed
Value；
The air-side flow resistance of air preheater is determined according to inlet air pressure measured value, outlet air pressure measured value.
According to the method for the embodiment of the present invention as described above, it is wet to the import and exports of three warehouse separated type air preheaters
Exhaust gas volumn, import and export flue-gas temperature, import and export air themperature, import and export air pressure, import and export flue gas pressures etc. are carried out
Detection, and air leak rate of air curtain, thermal capacity ratio, fume side efficiency, fume side flow resistance and air side are determined on this basis
Flow resistance, the characteristics of being adapted to three warehouse separated type air preheaters, can be effectively to the performance of three warehouse separated type air preheaters
Detected and assessed.
Brief description of the drawings
Fig. 1 is the warehouse separated type air preheater method for testing performance of large-sized station boiler three of the embodiment of the present invention；
Fig. 2 is schematic diagrames of the X in a specific example than fair curve.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with drawings and Examples, to this
Invention is described in further detail.It should be appreciated that embodiment described herein is only to explain the present invention,
Do not limit protection scope of the present invention.
Fig. 1 shows the warehouse separated type air preheater performance detection side of large-sized station boiler three in one embodiment of the invention
The schematic flow sheet of method.As shown in figure 1, the method in the present embodiment includes step：
Step S101：Detect and analyze the exiting flue gas composition of air preheater and the wet flue gas of each exiting flue gas composition
Measure, enter the import smoke components of air preheater and the wet flue gas amount of each import smoke components, obtain outlet wet flue gas measurement,
Import wet flue gas measurement；
Step S102：The input gas temperature of detection air preheater, inlet air temperature, outlet air temperature, import respectively
Flue gas static pressure, exiting flue gas static pressure, air side inlet pressure, air side outlet pressure, obtain input gas temperature measured value, enter
Mouthful air themperature measured value, outlet air temperature measured value, import flue gas pressures measured value, exiting flue gas pressure measuring value, enter
Mouth air pressure measurement, outlet air pressure measured value；
Step S103：The air leak rate of air curtain of air preheater is determined according to outlet wet flue gas measurement, import wet flue gas measurement；
Step S104：According to input gas temperature measured value, inlet air temperature measured value, outlet air temperature measured value
And the air preheater being calculated without leakage when exit gas temperature calculated value, it is determined that the heat capacity of air amount pair for passing through air preheater
Pass through the ratio measurements of the flue gas thermal capacity of air preheater；
Step S105：According to input gas temperature measured value, inlet air temperature measured value and the exiting flue gas temperature
Degree calculated value determines the fume side efficiency of air preheater；
Step S106：The fume side of air preheater is determined according to import flue gas pressures measured value, exiting flue gas pressure measuring value
Flow resistance measured value；
Step S107：The air side of air preheater is determined according to inlet air pressure measured value, outlet air pressure measured value
Flow resistance.
The method of the embodiment of the present invention as described above, to the air leak rate of air curtain of three warehouse separated type air preheaters, air-side flow resistance,
Fume side flow resistance, fume side efficiency etc. are detected, and effectively the performance of air preheater can be carried out on this basis
Assess.
Wherein, it is above-mentioned go out the exiting flue gas composition of air preheater and the wet flue gas amount of each exiting flue gas composition, can combine
The mode of gridding method sampling is carried out, such as is measured in every side preheater export level flue by 8 (hole) × 3 (point) grid, is surveyed
Amount composition can include O2、CO2, CO, measuring instrument can be flue gas analysis dolly.
Correspondingly, it is above-mentioned enter the import smoke components of air preheater and the wet flue gas amount of each import smoke components, can also
Carry out with reference to the mode that gridding method samples, such as measured on every side preheater inlet flue duct by 8 (hole) × 3 (point) grid, surveyed
Amount composition can include O2、CO2, CO, measuring instrument uses flue gas analysis dolly.The embodiment of the present invention is in combination with O2、CO2、CO
Air leak rate of air curtain is determined etc. the content of multiple gases, reduces the very big mistake for only obtaining air leak rate of air curtain in existing way by oxygen content
Difference, drastically increase the accuracy of air leak rate of air curtain.
The input gas temperature of above-mentioned air preheater, can be by arranging 8 (hole) × 3 on every side preheater inlet flue duct
(point) grid carries out grid measurement, and measurement primary instrument can use K-type thermocouple, and secondary meter can use FLUKE to measure
Instrument.
The outlet air temperature of above-mentioned air preheater, it can be determined with air temperature of conjunction outlet, outlet Secondary Air temperature, tool
Body is can to measure the air temperature of outlet one time of air preheater, export Secondary Air temperature and then will export an air temperature, go out
The weighted average of mouth Secondary Air temperature is defined as above-mentioned outlet air temperature measured value., can be with a specific example
It is weighted with reference to First air side outlet air capacity and Secondary Air side outlet air capacity and averagely obtains above-mentioned outlet air temperature survey
Value.
Wherein, the air temperature of the outlet of air preheater one time, can be carried out by the way of grid survey, for example, it is pre- in every side
Measured on the horizontal flue of hot device outlet First air side by 8 (hole) × 3 (point) grid.Measurement primary instrument can use T-shaped thermoelectricity
Even, secondary meter can use FLUKE measuring instrumentss.Correspondingly, the outlet Secondary Air temperature of air preheater, grid can also be used
Method measures, such as is measured on the horizontal flue of every side preheater outlet Secondary Air side by 8 (hole) × 3 (point) grid.Measurement is once
Instrument can use T-shaped thermocouple, and secondary meter can use FLUKE measuring instrumentss.
Correspondingly, the inlet air temperature of above-mentioned air preheater, air temperature of import, import secondary air temperature can also be combined
Degree determines, can be specifically after air temperature of import of measurement air preheater, import Secondary Air temperature, by import First air
Temperature, the weighted average of import Secondary Air temperature are defined as above-mentioned inlet air temperature measured value.In a specific example,
It can be combined with First air side-entrance air capacity and Secondary Air side-entrance air capacity be weighted and averagely obtain above-mentioned inlet air
Measured temperature.
Wherein, air temperature of the import of air preheater, can be by arranging 8 on every side preheater First air inlet flue duct
(hole) × 3 (point) grid measures.Measurement primary instrument can use K-type thermocouple, and secondary meter can use FLUKE measuring instruments
Table.Correspondingly, the import Secondary Air temperature of air preheater, can also be by arranging 8 on every side preheater secondary air inlet flue
(hole) × 3 (point) grid measures.Measurement primary instrument can use K-type thermocouple, and secondary meter can use FLUKE measuring instruments
Table.
Import flue gas static pressure, the exiting flue gas static pressure of above-mentioned air preheater, differential manometer entering in air preheater respectively can be used
Mouth flue-gas temperature gaging hole, exit gas temperature gaging hole measure.
The air side inlet pressure of above-mentioned air preheater, First air side-entrance static pressure, Secondary Air side-entrance static pressure can be combined
It is determined that entered respectively in air preheater First air side-entrance air themperature gaging hole, air preheater Secondary Air side with differential manometer
Mouth air themperature gaging hole measures.
Correspondingly, the air side outlet pressure of above-mentioned air preheater, First air side outlet static pressure, Secondary Air side can also be combined
Exit static pressure determines, can be specifically in air preheater First air side outlet air themperature gaging hole, air preheater Secondary Air with differential manometer
Side outlet air themperature gaging hole measures.
In another implementation, First air side-entrance static pressure, Secondary Air side-entrance static pressure, First air side outlet are quiet
Pressure, Secondary Air side outlet static pressure, directly (can also be directly obtained) from DCS system in scattered control system.
On the basis of above-mentioned each parameter is detected, further environment temperature, humidity, environmental pressure can also be examined
Survey, to carry out synthetic determination to air preheater performance.It is for instance possible to use glass thermometer measures atmospheric temperature, use is relatively wet
Table measurement atmospheric humidity is spent, atmospheric pressure is measured with aneroid barometer.
Further, it is also possible to be sampled to raw coal, and the raw coal of sampling is analyzed.The position of raw coal sampling can be
On the coal spout of every feeder, during experiment, all coal pulverizers that put into operation can be sampled in turn, the sample adopted
Sealing container will be put into time.And be sent to corresponding inspection center and carry out Industrial Analysis, elementary analysis and heating-value determination, and
The foundation that resulting result can calculate as air preheater heat exchange property.
Correspondingly, experiment flying dust can also be sampled in air preheater export level flue, test method can adopt
With gridding method, sample apparatus can use fly ash constant speed sampling instrument.The flying dust obtained to sampling can carry out phosphorus content analysis.
During experiment, it can also be exported in dragveyer and clinker is sampled, sampling interval can be set as 30 minutes.To taking
Clinker obtained by sample can carry out phosphorus content analysis.
In addition, by the place of boiler hot radiation effect, common thermometer measuring environment temperature can be not being used, is being adopted
Ambient humidity is measured with atmospheric humidity meter, atmospheric pressure is measured using aneroid barometer.During experiment, it can not be spaced 30 minutes
Measurement record once, takes arithmetic mean of instantaneous value as last measured value.
In detection process, central station of floating dock dial reading or record can also be obtained.
The various parameters obtained based on above-mentioned measurement, the air leak rate of air curtain of air preheater can be determined.Air preheater leaks out
Rate can be based on outlet wet flue gas measurement, import wet flue gas measurement determines.Can specifically following formula be used to carry out：
Wherein, ALRepresent air preheater air leakage rate, WG15Represent outlet wet flue gas measurement, WG14Represent import wet flue gas amount
Measured value.Its middle outlet wet flue gas measurement WG15Can be with every kilogram of wet flue gas amount for going out air preheater for entering stove fuel come table
Show, import wet flue gas measurement WG14It can be represented with every kilogram of wet flue gas amount for entering air preheater for entering stove fuel.
Above-mentioned ratio measurements can use following formula to determine：
Wherein, X represents the ratio measurements, tg1Input gas temperature measured value is represented, unit is DEG C (degree Celsius),
tg2NL represents exit gas temperature calculated value, and unit is DEG C (degree Celsius), ta1Inlet air temperature measured value is represented, unit is
DEG C (degree Celsius), ta2Outlet air temperature measured value is represented, unit is DEG C (degree Celsius).
Above-mentioned fume side efficiency can use following formula to determine：
Wherein, ηgRepresent the fume side efficiency, tg1Input gas temperature measured value is represented, unit is DEG C (degree Celsius),
tg2NL represents outlet smoke temperature measurement value, and unit is DEG C (degree Celsius), ta1Inlet air temperature measured value is represented, unit is
DEG C (degree Celsius).
Above-mentioned fume side flow resistance measured value can use following formula to determine：
ΔPg=Pg2-Pg1
Wherein, Δ PgRepresent fume side flow resistance measured value, Pg2Represent outlet flue gas pressures measured value, unit Pa
(pa), Pg1Import flue gas pressures measured value is represented, unit is Pa (pa).
Above-mentioned air-side flow resistance can use following formula to determine：
ΔPa=Pa1-Pa2
Wherein, Δ PaRepresent air-side flow resistance, Pa1Inlet air pressure measured value is represented, unit is Pa (pa), Pa2
Outlet air pressure measurement is represented, unit is Pa (pa).
In a specific example, can also further it detect at air inlet conduit adpting flange and exhanst gas outlet conduit
Pressure difference between adpting flange, obtains differential pressure measurement.The differential pressure measurement can be used for whether air leak rate of air curtain is needed to carry out
Amendment is judged.
In a specific example, deviation that can be between differential pressure measurement and pressure difference design load is inclined beyond predetermined pressure difference
Exceed predetermined inlet air temperature from the deviation between scope and inlet air temperature measured value and inlet air temperature design load
When deviateing scope, according to import wet flue gas measurement, import wet flue gas amount design load, the pressure difference design load, differential pressure measurement
Value, inlet air temperature measured value, inlet air temperature design load, are modified to the air leak rate of air curtain；
Wherein, above-mentioned pressure difference design load be design condition under air inlet conduit adpting flange at and exhanst gas outlet conduit
Pressure difference between adpting flange, above-mentioned inlet air temperature design load is the inlet air temperature value under design condition, above-mentioned
Import wet flue gas amount design load is the wet flue gas amount for entering air preheater under design condition.
In a specific example, the air leak rate of air curtain can be modified just using following formula：
In formula, AL,xRepresent revised air leak rate of air curtain, ALRepresent the air leak rate of air curtain before amendment, WG14Represent that import wet flue gas measures
Value, WGD14Represent import wet flue gas amount design load, Pa1d-Pg2dPressure difference design load is represented, unit is Pa (pa), Pa1-Pg2Represent
Differential pressure measurement, unit are Pa (pa), ta1Represent inlet air temperature measured value, ta1dRepresent inlet air temperature design load.
In scheme of the embodiment of the present invention, the exit gas temperature of air preheater can also be detected, obtain outlet cigarette
Gas measured temperature.During specific measurement, the mode that can combine grid survey is carried out, and is gone out in every side air preheater
Measured on mouth horizontal flue by 8 (hole) × 3 (point) grid.Measurement primary instrument can use T-shaped thermocouple, and secondary meter can be with
Using FLUKE measuring instrumentss.
, can be with the case where meeting exit gas temperature correction conditions after exit gas temperature measured value is obtained
Above-mentioned exit gas temperature measured value is modified.Exit gas temperature correction conditions can be based on different situation settings not
Same correction conditions.
In a specific example, exit gas temperature correction conditions can be：Inlet air temperature measured value and import
Deviation between air themperature design load deviates scope beyond predetermined inlet air temperature.Wherein, inlet air temperature design load
For the inlet air temperature value under design condition.
Deviation i.e. between inlet air temperature measured value and inlet air temperature design load exceeds predetermined inlet air
During temperature departure scope, judgement meets exit gas temperature correction conditions, and exit gas temperature measured value is modified, and repaiies
The value just obtained afterwards is referred to as first outlet flue-gas temperature correction value.
, can be according to inlet air temperature design load, input gas temperature measured value, inlet air temperature during specific amendment
Measured value, exit gas temperature measured value is modified, obtains revised first outlet flue-gas temperature correction value.
Specific correcting mode can use following formula to carry out：
Wherein, tg2,aRepresent first outlet flue-gas temperature correction value, ta1dRepresent inlet air temperature design load, tg1Represent
Input gas temperature measured value, tg2Represent the exit gas temperature measured value before amendment, ta1Represent inlet air temperature measurement
Value.
In another specific example, exit gas temperature correction conditions can be：Input gas temperature measured value is with entering
Deviation between mouth flue-gas temperature design load deviates scope beyond predetermined input gas temperature.Wherein, the input gas temperature
Design load is the input gas temperature value under design condition.
That is, the deviation between input gas temperature measured value and input gas temperature design load exceeds predetermined import flue gas
During temperature departure scope, judgement meets exit gas temperature correction conditions, and exit gas temperature measured value is modified, and repaiies
The value just obtained afterwards is referred to as second outlet flue-gas temperature correction value.
, can be according to input gas temperature design load, input gas temperature measured value, inlet air temperature during specific amendment
Measured value is modified to exit gas temperature measured value, obtains revised second outlet flue-gas temperature correction value.
Specific correcting mode can use following formula to carry out,
Wherein, tg2,gRepresent second outlet flue-gas temperature correction value, tg1dRepresent input gas temperature design load, tg1Represent
Input gas temperature measured value before amendment, tg2Represent outlet smoke temperature measurement value, ta1Represent inlet air temperature measurement
Value.
In another specific example, exit gas temperature correction conditions can be：The ratio measurements are set with ratio
Deviation between evaluation exceed default ratio deviation range and import wet flue gas measurement and import wet flue gas amount design load it
Between deviation exceed default wet flue gas amount deviation range.Wherein, ratio design load is the sky by air preheater under design condition
For gas thermal capacity to the ratio of the flue gas thermal capacity by air preheater, import wet flue gas amount design load is entering under design condition
The wet flue gas amount of air preheater.
Deviation i.e. between ratio measurements and ratio design load exceeds default ratio deviation range and import wet flue gas
When deviation between measurement and import wet flue gas amount design load exceeds default wet flue gas amount deviation range, judge to meet outlet
Flue-gas temperature correction conditions, and exit gas temperature measured value is modified, the value obtained after amendment is referred to as the 3rd outlet
Flue-gas temperature correction value.
During specific amendment, exit gas temperature measured value can be repaiied than fair curve according to the X under ECR operating modes
Just, revised 3rd exit gas temperature correction value is obtained.
X is the X ratios (ratio by the heat capacity of air amount of air preheater to the flue gas thermal capacity by air preheater than fair curve
Value) and import flue gas flow change after to the fair curve of the exit gas temperature of actual measurement.X in one specific example is than amendment
The schematic diagram of curve is as shown in Figure 2.
Above-mentioned three kinds of exit gas temperature correction conditions, based on being actually needed, it can be modified simultaneously with reference to three.Base
Repaiied in first outlet flue-gas temperature correction value obtained above, second outlet flue-gas temperature correction value, the 3rd exit gas temperature
On the occasion of can integrate and determine revised exit gas temperature measured value.
In a specific example, revised exit gas temperature measured value can be determined by following formula：
tg2'=tg2,a+tg2,g+tg2,X,M-tg2
Wherein, tg2' represent revised exit gas temperature measured value, tg2,aRepresent first outlet flue-gas temperature amendment
Value, tg2,gRepresent second outlet flue-gas temperature correction value, tg2,X,MRepresent the 3rd exit gas temperature correction value, tg2Represent amendment
Exit gas temperature measured value afterwards.
In the scheme of the embodiment of the present invention, flue gas flow can also be further detected, obtains import wet flue gas measurement
Value；
And the deviation between import wet flue gas measurement and flue gas flow design load deviates beyond predetermined flue gas flow
Deviation between scope, input gas temperature measured value and input gas temperature design load deviates beyond predetermined input gas temperature
Deviation between scope and exit gas temperature measured value and exit gas temperature design load is inclined beyond predetermined outlet flue-gas temperature
During from scope, fume side flow resistance measured value is modified.Wherein, flue gas flow design load is to enter sky under design condition
The flue gas flow of pre- device, input gas temperature design load are the input gas temperature under design condition, and exit gas temperature designs
It is worth for the exit gas temperature under design condition.
, can be according to import wet flue gas measurement, flue gas stream when being modified to fume side flow resistance measured value
Measure design load, input gas temperature measured value, exit gas temperature measured value, input gas temperature design load, exiting flue gas temperature
Design load is spent, fume side flow resistance measured value is carried out.Can specifically following formula be used to carry out：
Wherein, Δ Pg,xRepresent revised fume side flow resistance measured value, unit Pa, Δ PgBefore representing amendment
Fume side flow resistance measured value, unit Pa, MgdRepresent flue gas flow design load, unit t/h, MgRepresent import wet flue gas
Measurement, unit t/h, tg1dRepresent input gas temperature design load, unit for DEG C, tg2dRepresent exit gas temperature design
Value, unit for DEG C, tg1Represent input gas temperature measured value, unit for DEG C, tg2Represent outlet smoke temperature measurement value, unit
For DEG C.
In embodiments of the present invention, wind flow of import, import First air collateral resistance can also be further detected, is obtained
Import First air flow measurements, import First air collateral resistance measured value；
Deviation between import First air flow measurements and import First air flow design value exceeds predetermined import one
Deviation between secondary wind flow deviation range, import First air measured temperature and import First air temperature design value is beyond predetermined
Deviation between import First air temperature deviation scope and outlet First air measured temperature and outlet First air temperature design value
During beyond predetermined outlet First air temperature deviation scope, import First air collateral resistance measured value is modified.Wherein, it is described enter
Mouth First air flow design value is wind flow of import under design condition, and import First air temperature design value is design condition
Under air temperature of import, outlet First air temperature design value is the air temperature of outlet one time under design condition.
When being modified to import First air collateral resistance measured value, can according to import First air flow measurements, enter
Mouth First air flow design value, import First air measured temperature, import First air temperature design value, the air temperature of outlet one time are surveyed
Value, outlet First air temperature design value.Can specifically following formula be used to carry out：
Wherein, Δ P1a,xRepresent revised import First air collateral resistance measured value, unit Pa, Δ P1aBefore representing amendment
Import First air collateral resistance measured value, unit Pa, M1adRepresent import First air flow design value, unit t/h, M1aTable
Show import First air flow measurements, unit t/h, t1a1dRepresent import First air temperature design value, unit for DEG C, t1a2dTable
A mouthful First air temperature design value is shown, unit for DEG C, t1a1Represent import First air measured temperature, unit for DEG C, t1a2Represent
First air measured temperature is exported, unit is DEG C.
Correspondingly, in scheme of the embodiment of the present invention, import secondary air flow, import secondary side can also further be detected
Wind resistance, obtain import secondary air flow measured value, import secondary side wind resistance measured value；And measured in import secondary air flow
Deviation between value and import secondary air flow design load is beyond predetermined import secondary air flow deviation range, import secondary air temperature
The deviation spent between measured value and import Secondary Air temperature design load is beyond predetermined import Secondary Air temperature deviation range and exports
Deviation between Secondary Air measured temperature and outlet Secondary Air temperature design load exceeds predetermined outlet Secondary Air temperature deviation model
When enclosing, Secondary Air collateral resistance measured value is modified.
Wherein, the import secondary air flow design load be design condition under import secondary air flow, import Secondary Air
Temperature design value is the import Secondary Air temperature under design condition, and outlet Secondary Air temperature design load is the outlet under design condition
Secondary Air temperature.
, can be according to import secondary air flow measured value, import two when being modified to Secondary Air collateral resistance measured value
Secondary wind flow design load, import Secondary Air measured temperature, import Secondary Air temperature design load, outlet Secondary Air temperature survey
Value, outlet Secondary Air temperature design load are carried out.It can specifically be carried out by following formula：
Wherein, Δ P2a,xRepresent revised Secondary Air collateral resistance measured value, unit Pa, Δ P2aRepresent two before amendment
Secondary wind collateral resistance measured value, unit Pa, M2adRepresent import secondary air flow design load, unit t/h, M2aRepresent import two
Secondary distinguished and admirable measurement, unit t/h, t2a1dRepresent import Secondary Air temperature design load, unit for DEG C, t2a2dRepresent outlet two
Secondary air temperature design load, unit for DEG C, t2a1Represent import Secondary Air measured temperature, unit for DEG C, t2a2Represent that outlet is secondary
Air temperature measured value, unit are DEG C.
The method of the invention described above is specifically tested, the result obtained by testing is illustrated below.Certain
Power plant is transformed air preheater in No. 2 boiler SCR denitrations transform conveyance system, in order to examine No. 2 boiler air preheaters to change
Whether the performance parameter after making reaches performance guarantee value, and the power plant has carried out the performance of air preheater using the method for the present invention
Acceptance test.
It is as shown in table 1 below by specific experiment, the result of obtained air preheater air leakage rate.From table 1, actual measurement A is empty pre-
Device air leak rate of air curtain is that 4.77%, B air preheater air leakages rate is 4.48%；A air preheater air leakages rate is 4.86%, B empty pre- after amendment
Device air leak rate of air curtain is 4.97%.
The air preheater air leakage rate table of table 1
The result of the test of air preheater exhaust gas temperature (exit gas temperature) is as shown in table 2.
The air preheater exit gas temperature computational chart of table 2
| Survey calculation project | Symbol | Unit | Source | A sides preheater | B sides preheater |
| Import flue gas static pressure | Pg1 | kPa | Measurement | -1.80 | -1.92 |
| Exiting flue gas static pressure | Pg2 | kPa | Measurement | -3.42 | -3.60 |
| Import First air static air pressure | Pa11 | kPa | DCS | 8.43 | 8.53 |
| Export First air static air pressure | Pa12 | kPa | DCS | 7.96 | 8.06 |
| Import secondary air static pressure | Pa21 | kPa | DCS | 1.62 | 1.69 |
| Export secondary air static pressure | Pa22 | kPa | DCS | 0.57 | 0.70 |
| Flue gas resistance | ΔPg | kPa | Calculate | 1.620 | 1.680 |
| First air air drag | ΔPa1 | kPa | Calculate | 0.470 | 0.470 |
| Secondary air resistance | ΔPa2 | kPa | Calculate | 1.050 | 0.990 |
| Input gas temperature | tg1 | ℃ | Measurement | 349.60 | 345.50 |
| Exit gas temperature | tg2 | ℃ | Measurement | 138.82 | 136.05 |
| Import First air air themperature | ta11 | ℃ | Measurement | 34.30 | 34.70 |
| Export First air air themperature | ta12 | ℃ | Measurement | 313.00 | 309.00 |
| Import secondary air temperature | ta21 | ℃ | Measurement | 30.40 | 29.50 |
| Export secondary air temperature | ta22 | ℃ | Measurement | 320.00 | 316.00 |
| Atmospheric temperature | t0 | ℃ | Measurement | 32 | 32 |
| Atmospheric pressure | Bp | kPa | Measurement | 100.1 | 100.1 |
| Measure dynamic pressure | Pv | kPa | Measurement | 0.0460 | 0.0560 |
| Measure area | A | ㎡ | Measurement | 49.21 | 49.21 |
| Flue gas specific heat at constant pressure | Cpg | J/kg℃ | Design | 1094 | 1094 |
| Pressurization by compressed air specific heat | Cpa | J/kg℃ | Design | 1027 | 1027 |
| Exiting flue gas density | r | kg/㎡ | Calculate | 0.833 | 0.837 |
| Exiting flue gas amount | Mg2 | kg/s | Calculate | 430.76 | 476.44 |
| Import exhaust gas volumn | Mg1 | kg/s | Calculate | 411.13 | 456.01 |
| Inlet air amount | Ma1 | kg/s | Calculate | 350.85 | 391.35 |
| Outlet air amount | Ma2 | kg/s | Calculate | 331.22 | 361.69 |
| Correct flue-gas temperature | tg2n1 | ℃ | Calculate | 143.5 | 140.3 |
| X ratios | X | Calculate | 0.721 | 0.729 | |
| Fume side efficiency | hg | % | Calculate | 65.36 | 66.02 |
| Result of calculation amendment: | |||||
| Design flue gas resistance | ΔPgd | kPa | Design | 1.57 | 1.57 |
| Design First air air drag | ΔPad | kPa | Design | 0.47 | 0.47 |
| Design secondary air resistance | Pa21d-Pg2d | kPa | Design | 1.27 | 1.27 |
| Design First air differential pressure | tg1d | ℃ | Design | 11 | 11 |
| Design Secondary Air differential pressure | tg2d | ℃ | Design | 3.5 | 3.5 |
| Design input gas temperature | ta1d | ℃ | Design | 353 | 353 |
| Design exit gas temperature | ta2d | ℃ | Design | 126 | 126 |
| Design import First air air themperature | Mgd | kg/s | Design | 29 | 29 |
| Design outlet First air air themperature | Mad | kg/s | Design | 308 | 308 |
| Design import secondary air temperature | Lx | % | Calculate | 24 | 24 |
| Design outlet secondary air temperature | ΔPgx | kPa | Calculate | 318 | 318 |
| Design import exhaust gas volumn | ΔPax | kPa | Calculate | 366.350 | 366.350 |
| Design outlet air capacity | 292.000 | 292.000 | |||
| Exit gas temperature amendment | |||||
| Survey exit gas temperature | tg2 | ℃ | Measurement | 138.82 | 136.05 |
| The amendment that inlet air temperature deviates | tg2,a | ℃ | Calculate | 135.3 | 132.2 |
| The amendment that input gas temperature deviates | tg2,g | ℃ | Calculate | 139.9 | 138.5 |
| Air outlet slit and import exhaust gas volumn ratio | x | Calculate | 1.011 | 0.995 | |
| Actual measurement and design import exhaust gas volumn ratio | y | Calculate | 1.176 | 1.301 | |
| The deviation of X ratios, | tg2,x,m | ℃ | Look into figure | -11.0 | -10.0 |
| Exit gas temperature correction value | tg2′ | ℃ | Calculate | 125.4 | 124.7 |
From upper table 2, the A sides air preheater exit gas temperature that scene actually measures is 138.8 DEG C, and B sides air preheater goes out
Mouth flue-gas temperature is 136.1 DEG C, is 125.4 DEG C by revised A sides air preheater exhaust gas temperature；B air preheater exhaust gas temperatures are
124.7 DEG C, A, B side air preheater exit gas temperature meet design requirement.
By field test, A, B side the air preheater flue gas collateral resistance for measuring to obtain are respectively 1620Pa and 1690Pa, are passed through
It is respectively 1275Pa and 1082Pa that A, B side air preheater flue gas collateral resistance are obtained after amendment, and A, B air preheater flue gas collateral resistance meet to set
Meter requires.It is respectively 470Pa and 470Pa to measure obtained A, B side air preheater import First air collateral resistance, is obtained after amendment
A, B sides air preheater import First air collateral resistance is respectively 515Pa and 512Pa, and A, B air preheater import First air collateral resistance meet to set
Meter requires.It is respectively 1050Pa and 990Pa to measure obtained A, B side air preheater Secondary Air collateral resistance, and A, B are obtained after amendment
Side air preheater import First air collateral resistance is respectively 1151Pa and 1012Pa, and A, B air preheater Secondary Air collateral resistance meet that design will
Ask.
The inventive method is the warehouse separated type air preheater Performance Evaluation of large-sized station boiler three, has important directive significance
And engineering application value.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (4)
1. a kind of warehouse separated type air preheater method for testing performance of large-sized station boiler three, it is characterised in that including step：
Detect and analyze the exiting flue gas composition of air preheater and the wet flue gas amount of each exiting flue gas composition, enter entering for air preheater
The wet flue gas amount of mouth smoke components and each import smoke components, obtain outlet wet flue gas measurement, import wet flue gas measures
Value；
The input gas temperature of detection air preheater, inlet air temperature, outlet air temperature, import flue gas static pressure, outlet respectively
Flue gas static pressure, air side inlet pressure, air side outlet pressure, obtain input gas temperature measured value, inlet air temperature is surveyed
Value, outlet air temperature measured value, import flue gas pressures measured value, exiting flue gas pressure measuring value, inlet air pressure are surveyed
Value, outlet air pressure measured value；
The air leak rate of air curtain of air preheater is determined according to outlet wet flue gas measurement, import wet flue gas measurement；
According to input gas temperature measured value, inlet air temperature measured value, outlet air temperature measured value and it is calculated
Air preheater without leakage when exit gas temperature calculated value, it is determined that by the heat capacity of air amount of air preheater to passing through air preheater
The ratio measurements of flue gas thermal capacity；
Determined according to input gas temperature measured value, inlet air temperature measured value and the exit gas temperature calculated value empty
The fume side efficiency of pre- device；
The fume side flow resistance for determining air preheater according to import flue gas pressures measured value, exiting flue gas pressure measuring value measures
Value；
The air-side flow resistance of air preheater is determined according to inlet air pressure measured value, outlet air pressure measured value；
The exit gas temperature of air preheater is detected, obtains exit gas temperature measured value；
Detect meet exit gas temperature correction conditions when, the exit gas temperature measured value is modified；
Deviation between inlet air temperature measured value and inlet air temperature design load is inclined beyond predetermined inlet air temperature
During from scope, according to inlet air temperature design load, input gas temperature measured value, inlet air temperature measured value, to outlet
Smoke temperature measurement value is modified, and obtains revised first outlet flue-gas temperature correction value；
It is inclined that deviation between input gas temperature measured value and input gas temperature design load exceeds default input gas temperature
During from scope, according to input gas temperature design load, input gas temperature measured value, inlet air temperature measured value to exporting cigarette
Gas measured temperature is modified, and obtains revised second outlet flue-gas temperature correction value；
Deviation between the ratio measurements and ratio design load exceeds default ratio deviation range and import wet flue gas amount
When deviation between measured value and import wet flue gas amount design load exceeds default wet flue gas amount deviation range, according under ECR operating modes
X exit gas temperature measured value is modified than fair curve, obtain revised 3rd exit gas temperature correction value；
According to the revised first outlet flue-gas temperature correction value, revised second outlet flue-gas temperature correction value, repair
The 3rd exit gas temperature correction value after just determines revised exit gas temperature measured value；
The exit gas temperature correction conditions include：
Deviation between inlet air temperature measured value and inlet air temperature design load deviates beyond predetermined inlet air temperature
Scope, the inlet air temperature design load are the inlet air temperature value under design condition；
Deviation between input gas temperature measured value and input gas temperature design load deviates beyond predetermined input gas temperature
Scope, the input gas temperature design load are the input gas temperature value under design condition；
Deviation between the ratio measurements and ratio design load exceeds default ratio deviation range and import wet flue gas measures
Deviation between value and import wet flue gas amount design load exceeds default wet flue gas amount deviation range, and ratio design load is design bar
The heat capacity of air amount by air preheater under part is set to the ratio of the flue gas thermal capacity by air preheater, import wet flue gas amount
Evaluation is the wet flue gas amount for entering air preheater under design condition；
Also include step：
Deviation between import wet flue gas measurement and flue gas flow design load deviates scope beyond predetermined flue gas flow, entered
Deviation between mouthful smoke temperature measurement value and input gas temperature design load beyond predetermined input gas temperature deviate scope and
Deviation between exit gas temperature measured value and exit gas temperature design load deviates scope beyond predetermined outlet flue-gas temperature
When, measured according to import wet flue gas measurement, flue gas flow design load, input gas temperature measured value, exit gas temperature
Value, input gas temperature design load, exit gas temperature design load, are modified to fume side flow resistance measured value；
Wherein, flue gas flow design load is the flue gas flow for entering air preheater under design condition, and input gas temperature design load is
Input gas temperature under design condition, exit gas temperature design load are the exit gas temperature under design condition；
Wind flow of import, import First air collateral resistance are detected, obtains import First air flow measurements, import First air side
Drag force measurement；
Deviation between import First air flow measurements and import First air flow design value exceeds predetermined import First air
Deviation between flow deviation scope, import First air measured temperature and import First air temperature design value exceeds predetermined import
First air temperature deviation scope and outlet First air measured temperature and the deviation exported between First air temperature design value exceed
During predetermined outlet First air temperature deviation scope, according to import First air flow measurements, import First air flow design value, enter
Mouth First air measured temperature, import First air temperature design value, outlet First air measured temperature, an outlet air temperature are set
Evaluation is modified to import First air collateral resistance measured value；
Import secondary air flow, import secondary side wind resistance are detected, obtains import secondary air flow measured value, the secondary crosswind of import
Drag force measurement；
Deviation between import secondary air flow measured value and import secondary air flow design load exceeds predetermined import Secondary Air
Deviation between flow deviation scope, import Secondary Air measured temperature and import Secondary Air temperature design load exceeds predetermined import
Secondary Air temperature deviation range and outlet Secondary Air measured temperature and the deviation exported between Secondary Air temperature design load exceed
During predetermined outlet Secondary Air temperature deviation range, according to import secondary air flow measured value, import secondary air flow design load, enter
Mouth Secondary Air measured temperature, import Secondary Air temperature design load, outlet Secondary Air measured temperature, outlet Secondary Air temperature are set
Evaluation is modified to Secondary Air collateral resistance measured value；
Wherein, the import First air flow design value be design condition under wind flow of import, air temperature of import
Design load is air temperature of import under design condition, outlet First air temperature design value be outlet under design condition once
Air temperature；The import secondary air flow design load is the import secondary air flow under design condition, and import Secondary Air temperature is set
Evaluation is the import Secondary Air temperature under design condition, and outlet Secondary Air temperature design load is the outlet Secondary Air under design condition
Temperature.
2. the warehouse separated type air preheater method for testing performance of large-sized station boiler three according to claim 1, its feature exist
In, including：
Measure air temperature of import of air preheater, export an air temperature, import Secondary Air temperature, outlet Secondary Air temperature；
The weighted average of air temperature of import, import Secondary Air temperature is defined as the inlet air temperature measured value；
An air temperature will be exported, the weighted average of outlet Secondary Air temperature determines the outlet air temperature measured value.
3. the warehouse separated type air preheater method for testing performance of large-sized station boiler three according to claim 1, its feature exist
In, including：
Obtain First air side-entrance static pressure, Secondary Air side-entrance static pressure, First air side outlet static pressure, Secondary Air side outlet static pressure；
The inlet air pressure measured value is determined according to First air side-entrance static pressure, Secondary Air side-entrance static pressure；
The outlet air pressure measured value is determined according to First air side outlet static pressure, Secondary Air side outlet static pressure.
4. the warehouse separated type air preheater method for testing performance of large-sized station boiler three according to claim 1, its feature exist
In, in addition to step：
The pressure difference at air inlet conduit adpting flange and between exhanst gas outlet conduit adpting flange is detected, obtains differential pressure measurement
Value；
Deviation between differential pressure measurement and pressure difference design load deviates scope beyond predetermined pressure difference and inlet air temperature measures
When deviation between value and inlet air temperature design load exceeds predetermined inlet air temperature deviation scope, according to import wet flue gas
Measurement, import wet flue gas amount design load, the pressure difference design load, differential pressure measurement, inlet air temperature measured value, import
Air themperature design load, the air leak rate of air curtain is modified；
Wherein, the pressure difference design load is to be connected at the air inlet conduit adpting flange under design condition with exhanst gas outlet conduit
Pressure difference between flange, the inlet air temperature design load be design condition under inlet air temperature value, the import
Wet flue gas amount design load is the wet flue gas amount for entering air preheater under design condition.
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| CN108019773B (en) * | 2017-11-02 | 2019-11-29 | 华润电力（贺州）有限公司 | A kind of boiler air-supply volume optimizing regulation technology based on DCS system |
| 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 |
| CN112082786B (en) * | 2020-07-20 | 2022-07-22 | 国网河北省电力有限公司电力科学研究院 | Method and device for predicting normal operation performance of air preheater of generator set |
| CN112034782A (en) * | 2020-09-17 | 2020-12-04 | 江阴信和电力仪表有限公司 | Air preheater online state monitoring and fault prediction method |
| 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 |
| CN114048635B (en) * | 2022-01-11 | 2022-05-03 | 天津国能津能滨海热电有限公司 | Performance detection method and device of air preheater and electronic equipment |
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