CN104807500A - Performance detecting method for trisector regenerative air preheater of large power station boiler - Google Patents

Abstract

Disclosed is a performance detecting method for a trisector regenerative air preheater of a large power station boiler. The method comprises the steps of obtaining inlet and outlet wet flue gas measured value through detection; obtaining the inlet flue gas temperature measured value, the inlet and outlet air temperature measured value, the inlet and outlet flue gas pressure measured value and the inlet and outlet air pressure measured value of the air preheater through detection; according to the inlet and outlet wet flue gas measured value, determining the air leakage rate; according to the inlet flue gas temperature measured value, the inlet and outlet air temperature measured value and outlet flue gas temperature calculated value, determining the ratio measured value of the air heat capacity to the flue gas heat capacity of the air preheater; according to the inlet flue gas temperature measured value, the inlet air temperature measured value and outlet flue gas temperature calculated value, determining the flue gas side efficiency; according to the outlet flue gas pressure measured value, determining the flue gas side flow resistance measured value; according to the inlet and outlet air pressure measured value, determining the air side flow resistance. The performance detecting method of the trisector regenerative air preheater of the large power station boiler is applicable to the characteristics of the trisector regenerative air preheater and can effectively help detect and evaluate the performance of the trisector regenerative air preheater.

Description

Large-sized station boiler three warehouse separated type air preheater method for testing performance

Technical field

The present invention relates to electric power network technique field, particularly relate to a kind of large-sized station boiler three warehouse separated type air preheater method for testing performance.

Background technology

Along with the develop rapidly of Power Plant in China, power station boiler air pre-heater develops into three warehouse separated type air preheaters by traditional Liang Fencang.Up to the present, the standard of carrying out the calculating of air preheater performance has national standard and ASME PTC4.3-1968 standard, because ASME PTC4.3-1968 standard considers the correction of air preheater on-the-spot operational factor off-design parameter, therefore adopt ASME PTC4.3-1968 standard to carry out air preheater performance test and paid attention to gradually.But, it is pointed out that ASME PTC4.3-1968 standard is only only applicable to the performance calculating of two warehouse separated type air preheaters, three warehouse separated type air preheater performances calculated, lacks and calculate standard accordingly.And by detecting the performance of air preheater and calculate, can effectively assess the performance of air preheater, and can transform air preheater accordingly, to ensure preheating of air performance, there is important directive significance and engineer applied value, therefore, carrying out the research of three warehouse separated type air preheater Performance Detection schemes, is a very urgent research work.

Summary of the invention

Based on this, the object of the embodiment of the present invention is to provide large-sized station boiler three warehouse separated type air preheater method for testing performance, and it can effectively detect the performance of three warehouse separated type air preheaters and assess.

For achieving the above object, the embodiment of the present invention by the following technical solutions:

A kind of large-sized station boiler three warehouse separated type air preheater method for testing performance, comprises step:

Detect and analyze the exiting flue gas composition of air preheater and each exiting flue gas composition wet flue gas amount, 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;

Detect 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 top hole pressure respectively, obtain input gas temperature measured value, inlet air temperature measured value, outlet air temperature measured value, import flue gas pressures measured value, exiting flue gas pressure measuring value, inlet air pressure measured value, outlet air pressure measured value;

According to the air leak rate of air curtain of outlet wet flue gas measurement, import wet flue gas measurement determination air preheater;

According to input gas temperature measured value, inlet air temperature measured value, outlet air temperature measured value and the air preheater that calculates without exit gas temperature calculated value when revealing, determine by the heat capacity of air amount of air preheater the ratio measurements of the flue gas thermal capacity by air preheater;

According to the fume side efficiency of input gas temperature measured value, inlet air temperature measured value and described exit gas temperature calculated value determination air preheater;

According to the fume side resistance to flow measured value of import flue gas pressures measured value, exiting flue gas pressure measuring value determination air preheater;

According to the air-side flow resistance of inlet air pressure measured value, outlet air pressure measured value determination air preheater.

According to the method for the embodiment of the present invention as above, it is the import and export wet flue gas amount to three warehouse separated type air preheaters, import and export flue-gas temperature, import and export air themperature, import and export air pressure, import and export flue gas pressures etc. detects, and determine air leak rate of air curtain, thermal capacity ratio, fume side efficiency, fume side resistance to flow and air-side flow resistance on this basis, be adapted to the feature of three warehouse separated type air preheaters, can effectively the performance of three warehouse separated type air preheaters detected and be assessed.

Accompanying drawing explanation

Fig. 1 is the large-sized station boiler three warehouse separated type air preheater method for testing performance of the embodiment of the present invention;

Fig. 2 is the schematic diagram of the X in a concrete example than fair curve.

Embodiment

For making object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that embodiment described herein only in order to explain the present invention, do not limit protection scope of the present invention.

Fig. 1 shows the schematic flow sheet of the large-sized station boiler three warehouse separated type air preheater method for testing performance in one embodiment of the invention.As shown in Figure 1, the method in the present embodiment comprises step:

Step S101: detect and analyze the exiting flue gas composition of air preheater and each exiting flue gas composition wet flue gas amount, 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: detect 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 top hole pressure respectively, obtains input gas temperature measured value, inlet air temperature measured value, outlet air temperature measured value, import flue gas pressures measured value, exiting flue gas pressure measuring value, inlet air pressure measured value, outlet air pressure measured value;

Step S103: according to the air leak rate of air curtain of outlet wet flue gas measurement, import wet flue gas measurement determination air preheater;

Step S104: according to input gas temperature measured value, inlet air temperature measured value, outlet air temperature measured value and the air preheater that calculates without exit gas temperature calculated value when revealing, determines by the heat capacity of air amount of air preheater the ratio measurements of the flue gas thermal capacity by air preheater;

Step S105: according to the fume side efficiency of input gas temperature measured value, inlet air temperature measured value and described exit gas temperature calculated value determination air preheater;

Step S106: according to the fume side resistance to flow measured value of import flue gas pressures measured value, exiting flue gas pressure measuring value determination air preheater;

Step S107: according to the air-side flow resistance of inlet air pressure measured value, outlet air pressure measured value determination air preheater.

The method of the embodiment of the present invention as above, detects the air leak rate of air curtain, air-side flow resistance, fume side resistance to flow, fume side efficiency etc. of three warehouse separated type air preheaters, can effectively assess the performance of air preheater on this basis.

Wherein, 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 carry out in conjunction with the mode of gridding method sampling, such as measure by 8 (hole) × 3 (point) grid on every side primary heater outlet horizontal flue, measuring composition can comprise O ₂, CO ₂, CO, surveying instrument can for flue gas analysis dolly.

Correspondingly, above-mentioned enter the import smoke components of air preheater and the wet flue gas amount of each import smoke components, also can carry out in conjunction with the mode of gridding method sampling, such as, measure by 8 (hole) × 3 (point) grid on the primary heater inlet flue duct of every side, measuring composition can comprise O ₂, CO ₂, CO, surveying instrument adopts flue gas analysis dolly.The embodiment of the present invention is simultaneously in conjunction with O ₂, CO ₂, the multiple gases such as CO content determine air leak rate of air curtain, to decrease in existing mode by means of only oxygen level to obtain the maximum error of air leak rate of air curtain, drastically increase the degree of accuracy of air leak rate of air curtain.

The input gas temperature of above-mentioned air preheater, can by arranging that on the primary heater inlet flue duct of every side 8 (hole) × 3 (point) grid carries out grid measurement, measure primary instrument and can adopt K type thermopair, secondary instrument can adopt FLUKE measurement instrument.

The outlet air temperature of above-mentioned air preheater, can determine in conjunction with outlet First air temperature, outlet Secondary Air temperature, specifically after the outlet First air temperature of measurement air preheater, outlet Secondary Air temperature, then the weighted mean value of outlet First air temperature, outlet Secondary Air temperature can be defined as above-mentioned outlet air temperature measured value.In a concrete example, can also be weighted in conjunction with First air side outlet air capacity and Secondary Air side outlet air capacity and on average obtain above-mentioned outlet air temperature measured value.

Wherein, the outlet First air temperature of air preheater, can adopt the mode of grid survey to carry out, such as, measure by 8 (hole) × 3 (point) grid on the horizontal flue of every side primary heater outlet First air side.Measure primary instrument and can adopt T-shaped thermopair, secondary instrument can adopt FLUKE measurement instrument.Correspondingly, the outlet Secondary Air temperature of air preheater, also can adopt grid survey, such as, measure by 8 (hole) × 3 (point) grid on the horizontal flue of every side primary heater outlet Secondary Air side.Measure primary instrument and can adopt T-shaped thermopair, secondary instrument can adopt FLUKE measurement instrument.

Correspondingly, the inlet air temperature of above-mentioned air preheater, also can determine in conjunction with import First air temperature, import Secondary Air temperature, can be specifically after the import First air temperature measuring air preheater, import Secondary Air temperature, the weighted mean value of import First air temperature, import Secondary Air temperature is defined as above-mentioned inlet air temperature measured value.In a concrete example, can also be weighted in conjunction with First air side-entrance air capacity and Secondary Air side-entrance air capacity and on average obtain above-mentioned inlet air temperature measured value.

Wherein, the import First air temperature of air preheater, can by arranging that on the primary heater First air inlet flue duct of every side 8 (hole) × 3 (point) grid is measured.Measure primary instrument and can adopt K type thermopair, secondary instrument can adopt FLUKE measurement instrument.Correspondingly, the import Secondary Air temperature of air preheater, also can by arranging that on the primary heater secondary air inlet flue of every side 8 (hole) × 3 (point) grid is measured.Measure primary instrument and can adopt K type thermopair, secondary instrument can adopt FLUKE measurement instrument.

The import flue gas static pressure of above-mentioned air preheater, exiting flue gas static pressure, can adopt microbarograph to measure at the input gas temperature gaging hole of air preheater, exit gas temperature gaging hole respectively.

The air side inlet pressure of above-mentioned air preheater, can determine in conjunction with First air side-entrance static pressure, Secondary Air side-entrance static pressure, can be specifically measure at air preheater First air side-entrance air themperature gaging hole, air preheater Secondary Air side-entrance air themperature gaging hole respectively with microbarograph.

Correspondingly, the air side top hole pressure of above-mentioned air preheater, also can determine in conjunction with First air side outlet static pressure, Secondary Air side outlet static pressure, can be specifically measure at air preheater First air side outlet air themperature gaging hole, air preheater Secondary Air side outlet air themperature gaging hole with microbarograph.

In another kind of implementation, First air side-entrance static pressure, Secondary Air side-entrance static pressure, First air side outlet static pressure, Secondary Air side outlet static pressure, also can directly from DCS system (directly obtaining scattered control system).

On the basis above-mentioned each parameter being detected, can also detect environment temperature, humidity, environmental pressure further, to carry out synthetic determination to air preheater performance.Such as, glass thermometer can be adopted to measure atmospheric temperature, measure atmospheric humidity with relative humidity table, measure atmospheric pressure with aneroid barometer.

In addition, can also sample raw coal, and the raw coal of sampling is analyzed.The position of raw coal sampling can be on the coal spout of every platform feeder, and at duration of test, can sample in turn all coal pulverizers that puts into operation, the sample adopted will be put into airtight container in time.And send to corresponding inspection center and carry out technical analysis, ultimate analysis and heating-value determination, and the foundation that the result obtained can calculate as air preheater heat exchange property.

Correspondingly, can also export on horizontal flue at air preheater and sample test flying dust, test method can adopt gridding method, and sample apparatus can adopt fly ash constant speed sampling instrument.Carbon content analysis can be carried out to sampling the flying dust obtained.

At duration of test, can also in dragveyer outlet to slag sampling, sample interval can be set as 30 minutes.Carbon content analysis can be carried out to the slag of sampling gained.

In addition, be not subject to the place of boiler hot radiation effect, common thermometer measures ambient temperature can adopted, adopting atmospheric humidity meter measures ambient humidity, adopt aneroid barometer to measure atmospheric pressure.Duration of test, can not have the 30 minutes survey records in interval once, gets arithmetic mean as last measured value.

In testing process, central station of floating dock dial reading or record can also be obtained.

Based on the various parameters that above-mentioned measurement obtains, can determine the air leak rate of air curtain of air preheater.The air leak rate of air curtain of air preheater can be determined based on outlet wet flue gas measurement, import wet flue gas measurement.Following formula specifically can be adopted to carry out:

$A_L=\frac{W_{G15}-W_{G14}}{W_{G14}}*100\%$

Wherein, A _lrepresent air preheater air leakage rate, W _g15represent outlet wet flue gas measurement, W _g14represent import wet flue gas measurement.Its middle outlet wet flue gas measurement W _g15the wet flue gas amount going out air preheater that can enter stove fuel with every kilogram represents, import wet flue gas measurement W _g14the wet flue gas amount entering air preheater that can enter stove fuel with every kilogram represents.

Above-mentioned ratio measurements can adopt following formula to determine:

$X=\frac{t_{g1}-t_{g2}\mathrm{NL}}{t_{a2}-t_{a1}}$

Wherein, X represents described ratio measurements, t _g1represent input gas temperature measured value, unit is DEG C (degree Celsius), t _g2nL represents exit gas temperature calculated value, and unit is DEG C (degree Celsius), t _a1represent inlet air temperature measured value, unit is DEG C (degree Celsius), t _a2represent outlet air temperature measured value, unit is DEG C (degree Celsius).

Above-mentioned fume side efficiency can adopt following formula to determine:

${\mathrm{\η}}_g=\frac{t_{g1}-t_{g2}\mathrm{NL}}{t_{g1}-t_{a1}}$

Wherein, η _grepresent described fume side efficiency, t _g1represent input gas temperature measured value, unit is DEG C (degree Celsius), t _g2nL represents outlet smoke temperature measurement value, and unit is DEG C (degree Celsius), t _a1represent inlet air temperature measured value, unit is DEG C (degree Celsius).

Above-mentioned fume side resistance to flow measured value can adopt following formula to determine:

ΔP _g＝P _g2-P _g1

Wherein, Δ P _grepresent fume side resistance to flow measured value, P _g2represent outlet flue gas pressures measured value, unit is Pa (handkerchief), P _g1represent import flue gas pressures measured value, unit is Pa (handkerchief).

Above-mentioned air-side flow resistance can adopt following formula to determine:

ΔP _a＝P _a1-P _a2

Wherein, Δ P _arepresent air-side flow resistance, P _a1represent Inlet air pressure measured value, unit is Pa (handkerchief), P _a2represent outlet air pressure measurement, unit is Pa (handkerchief).

In a concrete example, the pressure reduction between air inlet conduit joint flange place and exhanst gas outlet tubes connection flange can also be detected further, obtain differential pressure measurement value.This differential pressure measurement value may be used for judging the need of carrying out correction air leak rate of air curtain.

In a concrete example, deviation between differential pressure measurement value and pressure reduction design load can exceed predetermined pressure difference and depart from scope and deviation between inlet air temperature measured value and inlet air temperature design load exceeds predetermined inlet air temperature when departing from scope, according to import wet flue gas measurement, import wet flue gas amount design load, described pressure reduction design load, differential pressure measurement value, inlet air temperature measured value, inlet air temperature design load, described air leak rate of air curtain is revised;

Wherein, above-mentioned pressure reduction design load is air inlet conduit joint flange place under design conditions and the pressure reduction between exhanst gas outlet tubes connection flange, above-mentioned inlet air temperature design load is the inlet air temperature value under design conditions, and above-mentioned import wet flue gas amount design load is the wet flue gas amount entering air preheater under design conditions.

In a concrete example, following formula can be adopted just to modify to described air leak rate of air curtain:

$A_{L,x}=A_L*\frac{W_{G14}}{W_{\mathrm{GD}14}}*\sqrt{\frac{P_{a1d}-P_{g2d}}{P_{a1}-P_{g2}}*\frac{t_{a1}+273.15}{t_{a1d}+273.15}}$

In formula, A _l,xrepresent revised air leak rate of air curtain, A _lrepresent the air leak rate of air curtain before revising, W _g14represent import wet flue gas measurement, W _gD14represent import wet flue gas amount design load, P _a1d-P _g2drepresent pressure reduction design load, unit is Pa (handkerchief), P _a1-P _g2represent differential pressure measurement value, unit is Pa (handkerchief), t _a1represent inlet air temperature measured value, t _a1drepresent inlet air temperature design load.

In embodiment of the present invention scheme, can also detect the exit gas temperature of air preheater, obtain exit gas temperature measured value.During concrete measurement, can carry out in conjunction with the mode of grid survey, can be specifically measure by 8 (hole) × 3 (point) grid on every side air preheater outlet horizontal flue.Measure primary instrument and can adopt T-shaped thermopair, secondary instrument can adopt FLUKE measurement instrument.

After obtaining exit gas temperature measured value, when meeting exit gas temperature correction conditions, can also revise above-mentioned exit gas temperature measured value.Exit gas temperature correction conditions can set different correction conditions based on different situations.

In a concrete example, exit gas temperature correction conditions can be: the deviation between inlet air temperature measured value and inlet air temperature design load exceeds predetermined inlet air temperature and departs from scope.Wherein, inlet air temperature design load is the inlet air temperature value under design conditions.

Namely the deviation between inlet air temperature measured value and inlet air temperature design load exceeds predetermined inlet air temperature when departing from scope, judge to meet exit gas temperature correction conditions, and exit gas temperature measured value is revised, the value obtained after correction is referred to as the first exit gas temperature modified value.

During concrete correction, according to inlet air temperature design load, input gas temperature measured value, inlet air temperature measured value, exit gas temperature measured value can be revised, obtain revised first exit gas temperature modified value.

Concrete correcting mode can adopt following formula to carry out:

$t_{g2,a}=\frac{t_{a1d}*(t_{g1}-t_{g2})+t_{g1}*(t_{g2}-t_{a1})}{t_{g1}-t_{a1}}$

Wherein, t _{g2, a}represent the first exit gas temperature modified value, t _a1drepresent inlet air temperature design load, t _g1represent input gas temperature measured value, t _g2represent the exit gas temperature measured value before revising, t _a1represent inlet air temperature measured value.

In another specific example, exit gas temperature correction conditions can be: the deviation between input gas temperature measured value and input gas temperature design load exceeds predetermined input gas temperature and departs from scope.Wherein, described input gas temperature design load is the input gas temperature value under design conditions.

Namely, deviation between input gas temperature measured value and input gas temperature design load exceeds predetermined input gas temperature when departing from scope, judge to meet exit gas temperature correction conditions, and exit gas temperature measured value is revised, the value obtained after correction is referred to as the second exit gas temperature modified value.

During concrete correction, can revise exit gas temperature measured value according to input gas temperature design load, input gas temperature measured value, inlet air temperature measured value, obtain revised second exit gas temperature modified value.

Concrete correcting mode can adopt following formula to carry out,

$t_{g2,g}=\frac{t_{g1d}*(t_{g2}-t_{a1})+t_{a1}*(t_{g1}-t_{g2})}{t_{g1}-t_{a1}}$

Wherein, t _{g2, g}represent the second exit gas temperature modified value, t _g1drepresent input gas temperature design load, t _g1represent the input gas temperature measured value before revising, t _g2represent outlet smoke temperature measurement value, t _a1represent inlet air temperature measured value.

In another specific example, exit gas temperature correction conditions can be: the deviation between described ratio measurements and ratio design load exceeds default ratio deviation range and deviation between import wet flue gas measurement and import wet flue gas amount design load exceeds default wet flue gas amount deviation range.Wherein, ratio design load be the heat capacity of air amount by air preheater under design conditions to the ratio of the flue gas thermal capacity by air preheater, import wet flue gas amount design load is the wet flue gas amount entering air preheater under design conditions.

Namely the deviation between ratio measurements and ratio design load exceed default ratio deviation range and deviation between import wet flue gas measurement and import wet flue gas amount design load exceeds default wet flue gas amount deviation range time, judge to meet exit gas temperature correction conditions, and exit gas temperature measured value is revised, the value obtained after correction is referred to as the 3rd exit gas temperature modified value.

During concrete correction, can revise exit gas temperature measured value than fair curve according to the X under ECR operating mode, obtain revised 3rd exit gas temperature modified value.

X is the fair curve to the exit gas temperature of surveying after X ratio (by the heat capacity of air amount of the air preheater ratio to the flue gas thermal capacity by air preheater) and the change of import flue gas flow than fair curve.X in a concrete example than fair curve schematic diagram as shown in Figure 2.

Above-mentioned three kinds of exit gas temperature correction conditions, based on actual needs, can revise in conjunction with three simultaneously.Based on the first exit gas temperature modified value obtained above, the second exit gas temperature modified value, the 3rd exit gas temperature modified value, revised exit gas temperature measured value comprehensively can be determined.

In a concrete example, revised exit gas temperature measured value can be determined by following formula:

t _g2′＝t _g2,a+t _g2,g+t _g2,X,M-t _g2

Wherein, t _g2' represent revised exit gas temperature measured value, t _{g2, a}represent the first exit gas temperature modified value, t _{g2, g}represent the second exit gas temperature modified value, t _{g2, X, M}represent the 3rd exit gas temperature modified value, t _g2represent revised exit gas temperature measured value.

In the scheme of the embodiment of the present invention, flue gas flow can also be detected further, obtain import wet flue gas measurement;

And the deviation between import wet flue gas measurement and flue gas flow design load exceeds that predetermined flue gas flow departs from scope, deviation between input gas temperature measured value and input gas temperature design load exceeds predetermined input gas temperature and departs from scope and deviation between exit gas temperature measured value and exit gas temperature design load exceeds predetermined outlet flue-gas temperature when departing from scope, revises fume side resistance to flow measured value.Wherein, flue gas flow design load is the flue gas flow entering air preheater under design conditions, and input gas temperature design load is the input gas temperature under design conditions, and exit gas temperature design load is the exit gas temperature under design conditions.

When revising fume side resistance to flow measured value, according to import wet flue gas measurement, flue gas flow design load, input gas temperature measured value, exit gas temperature measured value, input gas temperature design load, exit gas temperature design load, fume side resistance to flow measured value can be carried out.Following formula specifically can be adopted to carry out:

$\mathrm{\Δ}{P}_{g,x}=\mathrm{\Δ}{P}_g\×\frac{M_{\mathrm{gd}}^2}{M_g^2}\×\frac{t_{g1d}+t_{g2d}+2\×273.15}{t_{g1}+t_{g2}+2\×273.15}$

Wherein, Δ P _g,xrepresent revised fume side resistance to flow measured value, unit is Pa, Δ P _grepresent the fume side resistance to flow measured value before revising, unit is Pa, M _gdrepresent flue gas flow design load, unit is t/h, M _grepresent import wet flue gas measurement, unit is t/h, t _g1drepresent input gas temperature design load, unit is DEG C, t _g2drepresent exit gas temperature design load, unit is DEG C, t _g1represent input gas temperature measured value, unit is DEG C, t _g2represent outlet smoke temperature measurement value, unit is DEG C.

In embodiments of the present invention, import First air flow, import First air collateral resistance can also be detected further, obtain 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 First air flow deviation scope, deviation between import First air measured temperature and import First air temperature design value exceeds predetermined import First air temperature deviation scope and the deviation exported between First air measured temperature and outlet First air temperature design value exceeds predetermined outlet First air temperature deviation scope time, import First air collateral resistance measured value is revised.Wherein, described import First air flow design value is the import First air flow under design conditions, and import First air temperature design value is the import First air temperature under design conditions, and outlet First air temperature design value is the outlet First air temperature under design conditions.

When revising import First air collateral resistance measured value, can according to import First air flow measurements, import First air flow design value, import First air measured temperature, import First air temperature design value, outlet First air measured temperature, outlet First air temperature design value.Following formula specifically can be adopted to carry out:

$\mathrm{\Δ}{P}_{1a,x}=\mathrm{\Δ}{P}_{1a}\×\frac{M_{1\mathrm{ad}}^2}{M_{1a}^2}\×\frac{t_{1a1d}+t_{1a2d}+2\×273.15}{t_{2a1}+t_{2a2}+2\×273.15}$

Wherein, Δ P _{1a, x}represent revised import First air collateral resistance measured value, unit is Pa, Δ P _1arepresent the import First air collateral resistance measured value before revising, unit is Pa, M _1adrepresent import First air flow design value, unit is t/h, M _1arepresent import First air flow measurements, unit is t/h, t _1a1drepresent import First air temperature design value, unit is DEG C, t _1a2drepresent outlet First air temperature design value, unit is DEG C, t _1a1represent import First air measured temperature, unit is DEG C, t _1a2represent outlet First air measured temperature, unit is DEG C.

Correspondingly, in embodiment of the present invention scheme, import secondary air flow, import secondary side windage resistance can also be detected further, obtain import secondary air flow measured value, import secondary side windage resistance measured value; And the deviation between import secondary air flow measured value and import secondary air flow design load exceeds predetermined import secondary air flow deviation range, deviation between import Secondary Air measured temperature and import Secondary Air temperature design load exceeds predetermined import Secondary Air temperature deviation range and the deviation exported between Secondary Air measured temperature and outlet Secondary Air temperature design load exceeds predetermined outlet Secondary Air temperature deviation range time, Secondary Air collateral resistance measured value is revised.

Wherein, described import secondary air flow design load is the import secondary air flow under design conditions, and import Secondary Air temperature design load is the import Secondary Air temperature under design conditions, and outlet Secondary Air temperature design load is the outlet Secondary Air temperature under design conditions.

When revising Secondary Air collateral resistance measured value, can carry out according to import secondary air flow measured value, import secondary air flow design load, import Secondary Air measured temperature, import Secondary Air temperature design load, outlet Secondary Air measured temperature, outlet Secondary Air temperature design load.Specifically can be undertaken by following formula:

$\mathrm{\Δ}{P}_{2a,x}=\mathrm{\Δ}{P}_{2a}\×\frac{M_{2\mathrm{ad}}^2}{M_{2a}^2}\×\frac{t_{2a1d}+t_{2a2d}+2\×273.15}{t_{2a1}+t_{2a2}+2\×273.15}$

Wherein, Δ P _{2a, x}represent revised Secondary Air collateral resistance measured value, unit is Pa, Δ P _2arepresent the Secondary Air collateral resistance measured value before revising, unit is Pa, M _2adrepresent import secondary air flow design load, unit is t/h, M _2arepresent import secondary air flow measured value, unit is t/h, t _2a1drepresent import Secondary Air temperature design load, unit is DEG C, t _2a2drepresent outlet secondary air temperature degree design load, unit is DEG C, t _2a1represent import Secondary Air measured temperature, unit is DEG C, t _2a2represent outlet secondary air temperature degree measured value, unit is DEG C.

The method of the invention described above specifically being tested, being illustrated testing the result obtained below.Certain power plant transforms air preheater in No. 2 boiler SCR denitration transformation matching constructions, in order to check No. 2 improved performance parameters of boiler air preheater whether to reach performance guarantee value, this power plant adopts method of the present invention to carry out the performances acceptance test of air preheater.

Through concrete test, the result of the air preheater air leakage rate obtained is as shown in table 1 below.From table 1, actual measurement A air preheater air leakage rate is 4.77%, B air preheater air leakage rate is 4.48%; After revising, A air preheater air leakage rate is 4.86%, B air preheater air leakage rate is 4.97%.

Table 1 air preheater air leakage rate table

The test findings of air preheater exhaust gas temperature (exit gas temperature) is as shown in table 2.

Table 2 air preheater exit gas temperature reckoner

Survey calculation project	Symbol	Unit	Source	A side primary heater	B side primary heater
						Import flue gas static pressure	P g1	kPa	Measure	-1.80	-1.92
Exiting flue gas static pressure	P g2	kPa	Measure	-3.42	-3.60
						Import First air static air pressure	P a11	kPa	DCS	8.43	8.53
Outlet First air static air pressure	P a12	kPa	DCS	7.96	8.06
						Import secondary air static pressure	P a21	kPa	DCS	1.62	1.69
Outlet secondary air static pressure	P a22	kPa	DCS	0.57	0.70
						Flue gas resistance	ΔP g	kPa	Calculate	1.620	1.680
First air air resistance	ΔP a1	kPa	Calculate	0.470	0.470
						Secondary air resistance	ΔP a2	kPa	Calculate	1.050	0.990
Input gas temperature	t g1	℃	Measure	349.60	345.50
						Exit gas temperature	t g2	℃	Measure	138.82	136.05
Import First air air themperature	t a11	℃	Measure	34.30	34.70
						Outlet First air air themperature	t a12	℃	Measure	313.00	309.00
Import secondary air temperature	t a21	℃	Measure	30.40	29.50
						Outlet secondary air temperature	t a22	℃	Measure	320.00	316.00
Atmospheric temperature	t 0	℃	Measure	32	32
						Atmospheric pressure	B p	kPa	Measure	100.1	100.1
Measure dynamic pressure	P v	kPa	Measure	0.0460	0.0560
						Measure area	A	㎡	Measure	49.21	49.21
Flue gas specific heat at constant pressure	C pg	J/kg℃	Design	1094	1094
						Pressurization by compressed air specific heat	C pa	J/kg℃	Design	1027	1027
Exiting flue gas density	r	kg/㎡	Calculate	0.833	0.837
						Exiting flue gas amount	M g2	kg/s	Calculate	430.76	476.44
Import exhaust gas volumn	M g1	kg/s	Calculate	411.13	456.01
						Inlet air amount	M a1	kg/s	Calculate	350.85	391.35
Outlet air amount	M a2	kg/s	Calculate	331.22	361.69
						Revise flue-gas temperature	t g2n1	℃	Calculate	143.5	140.3

X ratio	X		Calculate	0.721	0.729
						Fume side efficiency	h g	％	Calculate	65.36	66.02
Result of calculation correction:
						Design flue gas resistance	ΔP gd	kPa	Design	1.57	1.57
Design First air air resistance	ΔP ad	kPa	Design	0.47	0.47
						Design secondary air resistance	P a21d-P g2d	kPa	Design	1.27	1.27
Design First air differential pressure	t g1d	℃	Design	11	11
						Design Secondary Air differential pressure	t g2d	℃	Design	3.5	3.5
Design input gas temperature	t a1d	℃	Design	353	353
						Design exit gas temperature	t a2d	℃	Design	126	126
Design import First air air themperature	M gd	kg/s	Design	29	29
						Design outlet First air air themperature	M ad	kg/s	Design	308	308
Design import secondary air temperature	L x	％	Calculate	24	24
						Design outlet secondary air temperature	ΔP gx	kPa	Calculate	318	318
Design import exhaust gas volumn	ΔP ax	kPa	Calculate	366.350	366.350
						Design outlet air capacity				292.000	292.000
Exit gas temperature correction
						Actual measurement exit gas temperature	t g2	℃	Measure	138.82	136.05
The correction that inlet air temperature departs from	t g2,a	℃	Calculate	135.3	132.2
						The correction that input gas temperature departs from	t g2,g	℃	Calculate	139.9	138.5
Air out and import exhaust gas volumn ratio	x		Calculate	1.011	0.995
						Survey and design import exhaust gas volumn ratio	y		Calculate	1.176	1.301
X ratio departs from,	t g2,x,m	℃	Look into figure	-11.0	-10.0
						Exit gas temperature modified value	t g2′	℃	Calculate	125.4	124.7

From upper table 2, the A side air preheater exit gas temperature of on-the-spot actual measurement is 138.8 DEG C, and B side air preheater exit gas temperature is 136.1 DEG C, and through revised A side, air preheater exhaust gas temperature is 125.4 DEG C; B air preheater exhaust gas temperature is 124.7 DEG C, and A, B side air preheater exit gas temperature meets design requirement.

Through site test, measure A, B side air preheater fume side resistance obtained and be respectively 1620Pa and 1690Pa, after revising, obtain A, B side air preheater fume side resistance be respectively 1275Pa and 1082Pa, A, B air preheater fume side resistance meets design requirement.Measure A, B side air preheater import First air collateral resistance obtained and be respectively 470Pa and 470Pa, after revising, obtain A, B side air preheater import First air collateral resistance be respectively 515Pa and 512Pa, A, B air preheater import First air collateral resistance meets design requirement.Measure A, B side air preheater Secondary Air collateral resistance obtained and be respectively 1050Pa and 990Pa, after revising, obtain A, B side air preheater import First air collateral resistance be respectively 1151Pa and 1012Pa, A, B air preheater Secondary Air collateral resistance meets design requirement.

The inventive method is large-sized station boiler three warehouse separated type air preheater Performance Evaluation, has important directive significance and engineer applied value.

Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.

The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (10)

1. a large-sized station boiler three warehouse separated type air preheater method for testing performance, is characterized in that, comprise step:

Detect and analyze the exiting flue gas composition of air preheater and each exiting flue gas composition wet flue gas amount, 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;

Detect 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 top hole pressure respectively, obtain input gas temperature measured value, inlet air temperature measured value, outlet air temperature measured value, import flue gas pressures measured value, exiting flue gas pressure measuring value, inlet air pressure measured value, outlet air pressure measured value;

According to the air leak rate of air curtain of outlet wet flue gas measurement, import wet flue gas measurement determination air preheater;

According to input gas temperature measured value, inlet air temperature measured value, outlet air temperature measured value and the air preheater that calculates without exit gas temperature calculated value when revealing, determine by the heat capacity of air amount of air preheater the ratio measurements of the flue gas thermal capacity by air preheater;

According to the fume side efficiency of input gas temperature measured value, inlet air temperature measured value and described exit gas temperature calculated value determination air preheater;

According to the fume side resistance to flow measured value of import flue gas pressures measured value, exiting flue gas pressure measuring value determination air preheater;

According to the air-side flow resistance of inlet air pressure measured value, outlet air pressure measured value determination air preheater.

2. large-sized station boiler three warehouse separated type air preheater method for testing performance according to claim 1, is characterized in that, comprising:

Measure the import First air temperature of air preheater, outlet First air temperature, import Secondary Air temperature, outlet Secondary Air temperature;

The weighted mean value of import First air temperature, import Secondary Air temperature is defined as described inlet air temperature measured value;

The weighted mean value of outlet First air temperature, outlet Secondary Air temperature is determined described outlet air temperature measured value.

3. large-sized station boiler three warehouse separated type air preheater method for testing performance according to claim 1, is characterized in that, comprising:

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;

Described inlet air pressure measured value is determined according to First air side-entrance static pressure, Secondary Air side-entrance static pressure;

Described outlet air pressure measured value is determined according to First air side outlet static pressure, Secondary Air side outlet static pressure.

4. large-sized station boiler three warehouse separated type air preheater method for testing performance according to claim 1, is characterized in that, also comprise step:

Detect the pressure reduction between air inlet conduit joint flange place and exhanst gas outlet tubes connection flange, obtain differential pressure measurement value;

Deviation between differential pressure measurement value and pressure reduction design load exceeds predetermined pressure difference and departs from scope and deviation between inlet air temperature measured value and inlet air temperature design load exceeds predetermined inlet air temperature when departing from scope, according to import wet flue gas measurement, import wet flue gas amount design load, described pressure reduction design load, differential pressure measurement value, inlet air temperature measured value, inlet air temperature design load, described air leak rate of air curtain is revised;

Wherein, described pressure reduction design load is air inlet conduit joint flange place under design conditions and the pressure reduction between exhanst gas outlet tubes connection flange, described inlet air temperature design load is the inlet air temperature value under design conditions, and described import wet flue gas amount design load is the wet flue gas amount entering air preheater under design conditions.

5. large-sized station boiler three warehouse separated type air preheater method for testing performance according to claim 1, is characterized in that, also comprise step:

Detect the exit gas temperature of air preheater, obtain exit gas temperature measured value.

6. large-sized station boiler three warehouse separated type air preheater method for testing performance according to claim 5, is characterized in that, also comprise step:

Detect meet exit gas temperature correction conditions time, described exit gas temperature measured value is revised;

Described exit gas temperature correction conditions comprise following every in any one or combination in any:

Deviation between inlet air temperature measured value and inlet air temperature design load exceeds predetermined inlet air temperature and departs from scope, and described inlet air temperature design load is the inlet air temperature value under design conditions;

Deviation between input gas temperature measured value and input gas temperature design load exceeds predetermined input gas temperature and departs from scope, and described input gas temperature design load is the input gas temperature value under design conditions;

Deviation between described ratio measurements and ratio design load exceeds default ratio deviation range and deviation between import wet flue gas measurement and import wet flue gas amount design load exceeds default wet flue gas amount deviation range, ratio design load be the heat capacity of air amount by air preheater under design conditions to the ratio of the flue gas thermal capacity by air preheater, import wet flue gas amount design load is the wet flue gas amount entering air preheater under design conditions.

7. large-sized station boiler three warehouse separated type air preheater method for testing performance according to claim 6, is characterized in that:

Deviation between inlet air temperature measured value and inlet air temperature design load exceeds predetermined inlet air temperature when departing from scope, according to inlet air temperature design load, input gas temperature measured value, inlet air temperature measured value, exit gas temperature measured value is revised, obtains revised first exit gas temperature modified value;

Deviation between input gas temperature measured value and input gas temperature design load exceeds default input gas temperature when departing from scope, according to input gas temperature design load, input gas temperature measured value, inlet air temperature measured value, exit gas temperature measured value is revised, obtain revised second exit gas temperature modified value;

Deviation between described ratio measurements and ratio design load exceed default ratio deviation range and deviation between import wet flue gas measurement and import wet flue gas amount design load exceeds default wet flue gas amount deviation range time, than fair curve, exit gas temperature measured value is revised according to the X under ECR operating mode, obtain revised 3rd exit gas temperature modified value;

Revised exit gas temperature measured value is determined according to described revised first exit gas temperature modified value, revised second exit gas temperature modified value, revised 3rd exit gas temperature modified value.

8. large-sized station boiler three warehouse separated type air preheater method for testing performance according to claim 1, is characterized in that, also comprise step:

Deviation between import wet flue gas measurement and flue gas flow design load exceeds predetermined flue gas flow and departs from scope, deviation between input gas temperature measured value and input gas temperature design load exceeds predetermined input gas temperature and departs from scope, and the deviation between exit gas temperature measured value and exit gas temperature design load exceeds predetermined outlet flue-gas temperature when departing from scope, according to import wet flue gas measurement, flue gas flow design load, input gas temperature measured value, exit gas temperature measured value, input gas temperature design load, exit gas temperature design load, fume side resistance to flow measured value is revised,

Wherein, flue gas flow design load is the flue gas flow entering air preheater under design conditions, and input gas temperature design load is the input gas temperature under design conditions, and exit gas temperature design load is the exit gas temperature under design conditions.

9. large-sized station boiler three warehouse separated type air preheater method for testing performance according to claim 2, is characterized in that, also comprise step:

Detect import First air flow, import First air collateral resistance, obtain 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 First air flow deviation scope, deviation between import First air measured temperature and import First air temperature design value exceeds predetermined import First air temperature deviation scope, and the deviation between outlet First air measured temperature and outlet First air temperature design value is when exceeding predetermined outlet First air temperature deviation scope, according to import First air flow measurements, import First air flow design value, import First air measured temperature, import First air temperature design value, outlet First air measured temperature, outlet First air temperature design value is revised import First air collateral resistance measured value,

Wherein, described import First air flow design value is the import First air flow under design conditions, and import First air temperature design value is the import First air temperature under design conditions, and outlet First air temperature design value is the outlet First air temperature under design conditions.

10. large-sized station boiler three warehouse separated type air preheater method for testing performance according to claim 1, is characterized in that, also comprise step:

Detect import secondary air flow, import secondary side windage resistance, obtain import secondary air flow measured value, import secondary side windage resistance measured value;

Deviation between import secondary air flow measured value and import secondary air flow design load exceeds predetermined import secondary air flow deviation range, deviation between import Secondary Air measured temperature and import Secondary Air temperature design load exceeds predetermined import Secondary Air temperature deviation range, and the deviation between outlet Secondary Air measured temperature and outlet Secondary Air temperature design load is when exceeding predetermined outlet Secondary Air temperature deviation range, according to import secondary air flow measured value, import secondary air flow design load, import Secondary Air measured temperature, import Secondary Air temperature design load, outlet Secondary Air measured temperature, outlet Secondary Air temperature design load is revised Secondary Air collateral resistance measured value,

Wherein, described import secondary air flow design load is the import secondary air flow under design conditions, and import Secondary Air temperature design load is the import Secondary Air temperature under design conditions, and outlet Secondary Air temperature design load is the outlet Secondary Air temperature under design conditions.