CN106596156B - A kind of performance of precipitator test error assessment method - Google Patents
A kind of performance of precipitator test error assessment method Download PDFInfo
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Abstract
The present invention is a kind of performance of precipitator test error assessment method, and the error of dust concentration is calculated using the directly precision of measured value and dependence test instrument such as weighing and sampling volume in smoke dust sampling and analysis continuous mode；The error of deduster air leak rate of air curtain is calculated using the precision of deduster import and export flue gas oxygen content data and dependence test instrument；According to Differential Principle, the error formula of dust concentration and air leak rate of air curtain is transmitted and synthesized, the error for calculating efficiency of dust collection is obtained.The present invention provides a kind of assessment methods that can really reflect performance of precipitator test error using existing test device.
Description
Technical field
The present invention relates to dust collector of heat power plant performance test analysis technical field, specially a kind of performance of precipitator examination
Test error assessment method.
Background technique
Currently, efficiency of dust collection, air leak rate of air curtain etc. are used as and remove in the performance test of Thermal generation unit deduster and assessment test
The major parameter of dirt device design is concerned, they are the important performance indexes for characterizing deduster effect superiority and inferiority, can directly be determined
The size of house outlet dust concentration, and then whether influence smoke stack emission dust concentration up to standard.The assessment of performance of precipitator tries
In testing, the size of parameters evaluated error directly affects the accuracy and reliability of performance of precipitator evaluation.It is ultralow realizing
Under the overall background of discharge, the reference value of related data is highlighted.Under these conditions, it is necessary to flue dust (gas) sampling process
Error source is recognized, and is carried out theory analysis to the transmittance process of error and is calculated, to propose to the link for generating error
Control method, while the accuracy for dust collector performance test data provides supporting condition and guarantee.
Summary of the invention
It can really reflect performance of precipitator test error using existing test device it is an object of the present invention to provide a kind of
Assessment method.The technical scheme is that
A kind of performance of precipitator test error assessment method；
The performance of precipitator test the step of include:
A, dust concentration measures: acquiring flue dust using filter cylinder, obtains sampling quality parameter and sampling volume parameter, substitutes into public
Formula (1) obtains dust concentration C, mg/dNm3:
In formula, M1For the filter cylinder quality after sampling, mg；M2For the filter cylinder quality before sampling, mg；V is the sampling body marked under condition
Product, dNm3；Δ M is the fume amount acquired at measuring point, mg；
B, air leakage rate measuring: measuring oxygen concentration parameter in flue gas in deduster inlet and outlet measuring point respectively with flue gas analyzer,
It substitutes into formula (2) and obtains body of deduster air leak rate of air curtain Δ σ:
In formula, O2inFor electric precipitator admission section flue gas average oxygen content, %；O2outFor electric precipitator Outlet Section cigarette
Gas average oxygen content, %；K is constant 20.9%, indicates oxygen content in atmosphere；
C, efficiency of dust collection η is obtained using air leak rate of air curtain and deduster inlet and outlet dust concentration calculating,
In formula, CiIndicate deduster import dust concentration, mg/dNm3；C0Indicate house outlet dust concentration, mg/
dNm3；Δ σ is air leak rate of air curtain, %；
The error of the performance test test and assess the following steps are included:
1) air leak rate of air curtain, the parameter of dust concentration continuous mode Instrumental are obtained；
It 2) will be in the sampling quality parameter, sampling volume parameter and the step 1) that are obtained in step A dust concentration continuous mode
Instrument parameter substitutes into formula (4) and obtains the evaluated error W of dust concentrationc:
In formula, V is the sampling volume marked under condition, dNm3；Δ M is the fume amount acquired at measuring point, mg；WMFor the mistake of balance
Difference, g；WVFor the error of the sampler of the mark dry volume for measuring flue gas, dNm3；
3) instrument parameter of the oxygen concentration parameter and step 1) that obtain during step B air leakage rate measuring is substituted into formula
(5) evaluated error of air leak rate of air curtain is obtained:
In formula, O2inFor electric precipitator admission section flue gas average oxygen content, %；O2outFor electric precipitator Outlet Section cigarette
Gas average oxygen content, %；WO2For the error of the sampler of the oxygen content for measuring flue gas, %；K is constant 20.9%, is indicated
Oxygen content in atmosphere.
4) evaluated error of the evaluated error of step 2) dust concentration and step 3) air leak rate of air curtain is updated in formula (6) and is obtained
To the evaluated error W of dust removal efficiency efficiencyη:
In formula, CiIndicate deduster import dust concentration, mg/dNm3；C0Indicate house outlet dust concentration, mg/
dNm3；Δ σ is air leak rate of air curtain, %；WciIndicate the evaluated error of deduster import flue gas concentration；Wc0Indicate that house outlet flue gas is dense
The evaluated error of degree；WΔσIndicate the evaluated error of air leak rate of air curtain.
Further, in step A dust concentration measurement: will acquisition to filter cylinder ash sample be placed on 105 DEG C baking oven in
2h is dried, is subsequently placed in drier and is cooled to room temperature, service precision is that the balance of a ten thousandth is weighed.
Further, the measurement of air leak rate of air curtain uses intelligent flue gas analyzer in step B, imports and exports measuring point in deduster respectively
Parameter measurement is carried out using section gridding method.
The beneficial effects of the present invention are:
Compared with the prior art, the present invention from performance of precipitator evaluation test used instrument and equipment and sampling
Method is started with, and is analyzed the error introduced in smoke dust sampling and analysis continuous mode, and by oxygen amount, filter cylinder matter
The error propagation and calculating of the directly measured value such as amount, sampling volume, have obtained deduster dust concentration, air leak rate of air curtain, efficiency of dust collection
Etc. important indicators parameter theoretical error value, increase performance of precipitator evaluation reliability, while be dust collector performance test
The accuracy of data provides supporting condition and guarantee.
Specific embodiment
A kind of performance of precipitator test error assessment method；
The performance of precipitator test the step of include:
A, dust concentration measures: acquiring flue dust using filter cylinder, obtains sampling quality parameter and sampling volume parameter, will acquire
Dry 2h in the baking oven for being placed on 105 DEG C to the ash sample of filter cylinder, be subsequently placed in drier and be cooled to room temperature, service precision be ten thousand/
One balance weighing；
Parameter substitutes into formula (1) and obtains dust concentration C, mg/dNm3:
In formula, M1For the filter cylinder quality after sampling, mg；M2For the filter cylinder quality before sampling, mg；V is the sampling body marked under condition
Product, dNm3；Δ M is the fume amount acquired at measuring point, mg；
B, air leakage rate measuring: the measurement of air leak rate of air curtain uses intelligent flue gas analyzer, adopts respectively in deduster inlet and outlet measuring point
Parameter measurement is carried out with section gridding method；With flue gas analyzer, oxygen concentration is joined in deduster inlet and outlet measuring point measurement flue gas respectively
Number substitutes into formula (2) and obtains body of deduster air leak rate of air curtain Δ σ:
In formula, O2inFor electric precipitator admission section flue gas average oxygen content, %；O2outFor electric precipitator Outlet Section cigarette
Gas average oxygen content, %；K is constant 20.9%, indicates oxygen content in atmosphere；
C, efficiency of dust collection η is obtained using air leak rate of air curtain and deduster inlet and outlet dust concentration calculating,
In formula, CiIndicate deduster import dust concentration, mg/dNm3；C0Indicate house outlet dust concentration, mg/
dNm3；Δ σ is air leak rate of air curtain, %；
It is characterized by:
The error of the performance test test and assess the following steps are included:
1) air leak rate of air curtain, the parameter of dust concentration continuous mode Instrumental are obtained；
It 2) will be in the sampling quality parameter, sampling volume parameter and the step 1) that are obtained in step A dust concentration continuous mode
Instrument parameter substitutes into formula (4) and obtains the evaluated error W of dust concentrationc:
In formula, αMFor the Transmitting error cofficient of Δ M,αVFor the Transmitting error cofficient of V,WMFor the error of balance, g；WVFor the error of sampler (for measuring the mark dry volume of flue gas), dNm3；
V is the sampling volume marked under condition, dNm3；Δ M is the fume amount acquired at measuring point, mg；
3) instrument parameter of the oxygen concentration parameter and step 1) that obtain during step B air leakage rate measuring is substituted into formula
(5) evaluated error of air leak rate of air curtain is obtained:
In formula: αinFor O2inTransmitting error cofficient,αoutFor O2outError propagation system
Number, For the error of sampler (for measuring the oxygen content of flue gas), %；O2inFor electricity
Deduster admission section flue gas average oxygen content, %；O2outFor electric precipitator Outlet Section flue gas average oxygen content, %；K is normal
Number 20.9% indicates oxygen content in atmosphere；Deduster inlet and outlet are used to be measured with model instrument；
4) evaluated error of the evaluated error of step 2) dust concentration and step 3) air leak rate of air curtain is updated in formula (6) and is obtained
To the evaluated error W of dust removal efficiency efficiencyη:
In formula, CiIndicate deduster import dust concentration, mg/dNm3；C0Indicate house outlet dust concentration, mg/
dNm3；Δ σ is air leak rate of air curtain, %；WciIndicate the evaluated error of deduster import flue gas concentration；Wc0Indicate that house outlet flue gas is dense
The evaluated error of degree；WΔσIndicate the evaluated error of air leak rate of air curtain.
The complete process of error calculating step of the invention:
(1) directly measured value and the dependence test such as weighing and sampling volume in smoke dust sampling and analysis continuous mode are utilized
The precision of instrument obtains the error calculation formula of dust concentration
It is often used the measurement that filter cylinder carries out dust concentration, according to the increased quality of sampling front and back filter cylinder and sampling volume meter
It calculates, formula is as follows:
In formula, M1、M2The filter cylinder quality of-sampling front and back, mg；Sampling volume under V-mark condition, dNm3；At Δ M-measuring point
The fume amount of acquisition, mg.
The evaluated error of dust concentration is obtained by error theory, Differential Principle and (1) formula are as follows:
In formula,--- the Transmitting error cofficient of Δ M；--- the error propagation of V
Coefficient；WM--- the error of balance, g；WV--- the error (for measuring the mark dry volume of flue gas) of sampler, dNm3(wherein,
WMWith WVIt is related to the precision of measuring instrumentss).
(2) air leak rate of air curtain is obtained by the oxygen content of smoke gas that deduster is imported and exported, its calculation formula is:
In formula, O2in、O2out- electric precipitator import and export section flue gas average oxygen content, %；K -20.9% is (in atmosphere
Oxygen content is checked according to height above sea level table).
The evaluated error of air leak rate of air curtain is obtained by error theory, Differential Principle and (2) formula are as follows:
It is measured since deduster inlet and outlet are used with model instrument, then Wout=Win=WO2, (7) formula is simplified to:
In formula,——O2inTransmitting error cofficient；
——O2outTransmitting error cofficient,For the error of sampler (for measuring the oxygen content of flue gas), %.
(3) error formula of dust concentration and air leak rate of air curtain is transmitted and is synthesized, obtain the error theory of efficiency of dust collection
Calculation formula
Currently, the measurement of efficiency of dust collection generally use " electric precipitator performance test method " (GB/T13931-2002) and
Method specified in " sack cleaner technical requirements " (GB/T 6719-2009), its calculation formula is:
In formula, η --- efficiency of dust collection, %；Ci, Co --- respectively indicate deduster import and export dust concentration, mg/dNm3；
Δ σ --- air leak rate of air curtain, %.
The evaluated error of efficiency of dust collection is obtained by error theory, Differential Principle and (3) formula are as follows:
In formula,
Therefore, (8) formula can be rewritten as:
(6) formula is efficiency of dust collection evaluated error theoretical calculation formula.
Claims (3)
1. a kind of performance of precipitator test error assessment method；
The performance of precipitator test the step of include:
A, dust concentration measures: acquiring flue dust using filter cylinder, obtains sampling quality parameter and sampling volume parameter, substitutes into formula
(1) dust concentration C, mg/dNm are obtained3:
In formula, M1For the filter cylinder quality after sampling, mg；M2For the filter cylinder quality before sampling, mg；V is the sampling volume marked under condition,
dNm3；Δ M is the fume amount acquired at measuring point, mg；
B, air leakage rate measuring: with flue gas analyzer oxygen concentration parameter, substitution in deduster inlet and outlet measuring point measurement flue gas respectively
Formula (2) obtains body of deduster air leak rate of air curtain Δ σ:
In formula, O2inFor electric precipitator admission section flue gas average oxygen content, %；O2outIt is average for electric precipitator Outlet Section flue gas
Oxygen content, %；K is constant 20.9%, indicates oxygen content in atmosphere；
C, efficiency of dust collection η is obtained using air leak rate of air curtain and deduster inlet and outlet dust concentration calculating,
In formula, CiIndicate deduster import dust concentration, mg/dNm3；C0Indicate house outlet dust concentration, mg/dNm3；Δσ
For air leak rate of air curtain, %；
It is characterized by:
The error of the performance test test and assess the following steps are included:
1) air leak rate of air curtain, the parameter of dust concentration continuous mode Instrumental are obtained；
2) sampling quality parameter, sampling volume parameter and the step 1) Instrumental that will be obtained in step A dust concentration continuous mode
Parameter substitutes into formula (4) and obtains the evaluated error W of dust concentrationc:
In formula, V is the sampling volume marked under condition, dNm3；Δ M is the fume amount acquired at measuring point, mg；WMFor the error of balance, g；
WVFor the error of the sampler of the mark dry volume for measuring flue gas, dNm3；
3) instrument parameter of the oxygen concentration parameter and step 1) that obtain during step B air leakage rate measuring formula (5) are substituted into obtain
To the evaluated error of air leak rate of air curtain:
In formula, O2inFor electric precipitator admission section flue gas average oxygen content, %；O2outIt is average for electric precipitator Outlet Section flue gas
Oxygen content, %；For the error of the sampler of the oxygen content for measuring flue gas, %；K is constant 20.9%, is indicated in atmosphere
Oxygen content；
4) evaluated error of the evaluated error of step 2) dust concentration and step 3) air leak rate of air curtain is updated in formula (6) and is removed
The evaluated error W of dirt rate efficiencyη:
In formula, CiIndicate deduster import dust concentration, mg/dNm3；C0Indicate house outlet dust concentration, mg/dNm3；Δσ
For air leak rate of air curtain, %；WciIndicate the evaluated error of deduster import flue gas concentration；Wc0Indicate the survey of house outlet flue gas concentration
Determine error；WΔσIndicate the evaluated error of air leak rate of air curtain.
2. performance of precipitator test error assessment method according to claim 1, it is characterised in that: flue dust is dense in step A
The measurement of degree: drying 2h for acquiring in the baking oven for being placed on 105 DEG C to the ash sample of filter cylinder, be subsequently placed in drier and be cooled to room temperature,
Service precision is that the balance of a ten thousandth is weighed.
3. performance of precipitator test error assessment method according to claim 1, it is characterised in that: air leak rate of air curtain in step B
Measurement use intelligent flue gas analyzer, respectively deduster inlet and outlet measuring point using section gridding method carry out parameter measurement.
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| US5311420A (en) * | 1992-07-17 | 1994-05-10 | Environmental Elements Corp. | Automatic back corona detection and protection system |
| CN204203203U (en) * | 2014-11-12 | 2015-03-11 | 山东科技大学 | A kind of experimental provision for measuring foam dedusting agent efficiency of dust collection |
| CN204411956U (en) * | 2015-01-11 | 2015-06-24 | 褚相武 | A kind of filter drum type precipitator |
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