CN106596156A - Method for evaluating performance test errors of dust remover - Google Patents

Abstract

The invention relates to a method for evaluating performance test errors of a dust remover, and the method comprises the steps: calculating a smoke concentration error through employing direct measurement values of weighing and sampling size in a smoke sampling and analysis measurement process and the precision of a related testing instrument; calculating an air leakage rate error of the dust remover through employing the smoke oxygen content data of the inlet and outlet of the dust remover and the precision of the related testing instrument; carrying out transmission and synthesis of an error formulas of smoke concentration and air leakage rate according to differential principle, and obtaining the error of a calculated dust removing efficiency. The method provided by the invention can truly reflect the performance test errors of the dust remover through a conventional testing device.

Description

A kind of performance of precipitator test error assessment method

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 technology

At present, during the performance test of Thermal generation unit cleaner unit is tested with assessment, the conduct such as efficiency of dust collection, air leak rate of air curtain is removed The major parameter of dirt device design receives much concern, and they are to characterize the good and bad important performance indexes of cleaner unit effect, directly can be determined The size of house outlet dust concentration, and then affect smoke stack emission dust concentration whether up to standard.The assessment examination of performance of precipitator In testing, the size of parameters evaluated error directly affects the accuracy and reliability of performance of precipitator evaluation.Realize it is ultralow 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 Source of error is recognized, and the transmittance process of error is carried out theory analysis and calculated, so that the link to producing error is proposed Control method, while the accuracy for performance of precipitator test data provides supporting condition and guarantee.

The content of the invention

It is an object of the present invention to provide a kind of can truly reflect performance of precipitator test error using existing test device Assessment method.The technical scheme is that：

A kind of performance of precipitator test error assessment method；

The step of performance of precipitator is tested includes：

A, dust concentration are determined：Flue dust is gathered using filter cylinder, sampling quality parameter and sampling volume parameter is obtained, is substituted 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 to mark the sampling body under condition Product, dNm³；Fume amounts of the Δ M for collection at measuring point, mg；

B, air leakage rate measuring：Oxygen concentration parameter in measuring point measurement flue gas is imported and exported in cleaner unit respectively with flue gas analyzer, Substitute into formula (2) and obtain cleaner unit body air leak rate of air curtain Δ σ：

In formula, O_2inFor electric cleaner admission section flue gas average oxygen content, %；O_2outFor electric cleaner Outlet Section cigarette Gas average oxygen content, %；K is constant 20.9%, represents oxygen content in air；

C, dust concentration imported and exported using air leak rate of air curtain and cleaner unit calculate and draw efficiency of dust collection η,

In formula, C_iRepresent cleaner unit import dust concentration, mg/dNm³；C₀Represent house outlet dust concentration, mg/ dNm³；Δ σ be air leak rate of air curtain, %；

The error test and appraisal of the performance test are comprised the following steps：

1) air leak rate of air curtain, the parameter of dust concentration continuous mode Instrumental are obtained；

2) by the sampling quality parameter, sampling volume parameter and the step 1 that obtain in step A dust concentration continuous mode) in Instrument parameter obtains evaluated error W of dust concentration in substituting into formula (4)_c：

In formula, V is to mark the sampling volume under condition, dNm³；Fume amounts of the Δ M for collection at measuring point, mg；W_MFor the mistake of balance Difference, g；W_VIt is the error for determining the sampler of the mark dry volume of flue gas, dNm³；

3) by the oxygen concentration parameter obtained during step B air leakage rate measuring and step 1) instrument parameter substitute into formula (5) obtain the evaluated error of air leak rate of air curtain：

In formula, O_2inFor electric cleaner admission section flue gas average oxygen content, %；O_2outFor electric cleaner Outlet Section cigarette Gas average oxygen content, %；W_O2It is the error for determining the sampler of the oxygen content of flue gas, %；K is constant 20.9%, is represented Oxygen content in air.

4) by step 2) evaluated error of dust concentration and step 3) evaluated error of air leak rate of air curtain is updated in formula (6) To evaluated error W of dust removal efficiency efficiency_η：

In formula, C_iRepresent cleaner unit import dust concentration, mg/dNm³；C₀Represent house outlet dust concentration, mg/ dNm³；Δ σ be air leak rate of air curtain, %；W_ciRepresent the evaluated error of cleaner unit import flue gas concentration；W_c0Represent that house outlet flue gas is dense The evaluated error of degree；W_ΔσRepresent the evaluated error of air leak rate of air curtain.

Further, in step A dust concentration measure：The ash sample of collection to filter cylinder is placed in 105 DEG C of baking oven 2h is dried, in being subsequently placed in exsiccator, is cooled to room temperature, service precision is weighed for the balance of a ten thousandth.

Further, in step B, the measure of air leak rate of air curtain adopts intelligent flue gas analyser, imports and exports measuring point in cleaner unit respectively Parameter measurement is carried out using section gridding method.

The invention has the beneficial effects as follows：

Compared with the prior art, the instrument and equipment that used and sampling of the present invention from performance of precipitator evaluation test Method is started with, and smoke dust sampling is analyzed with the error introduced in continuous mode is analyzed, and by oxygen amount, filter cylinder matter The error propagation of the direct measurement value such as amount, sampling volume and calculating, have drawn cleaner unit dust concentration, air leak rate of air curtain, efficiency of dust collection Etc. the theoretical error value of important indicator parameter, the reliability of performance of precipitator evaluation is increased, while testing for performance of precipitator The accuracy of data provides supporting condition and guarantee.

Specific embodiment

A kind of performance of precipitator test error assessment method；

The step of performance of precipitator is tested includes：

A, dust concentration are determined：Flue dust is gathered using filter cylinder, sampling quality parameter and sampling volume parameter is obtained, will collection Ash sample to filter cylinder is placed in 105 DEG C of baking oven and dries 2h, is cooled to room temperature in being subsequently placed in exsiccator, and service precision is ten thousand/ One balance is weighed；

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 to mark the sampling body under condition Product, dNm³；Fume amounts of the Δ M for collection at measuring point, mg；

B, air leakage rate measuring：The measure of air leak rate of air curtain adopts intelligent flue gas analyser, imports and exports measuring point in cleaner unit respectively and adopts Parameter measurement is carried out with section gridding method；Oxygen concentration ginseng in measuring point measurement flue gas is imported and exported in cleaner unit respectively with flue gas analyzer Number, substitutes into formula (2) and obtains cleaner unit body air leak rate of air curtain Δ σ：

In formula, O_2inFor electric cleaner admission section flue gas average oxygen content, %；O_2outFor electric cleaner Outlet Section cigarette Gas average oxygen content, %；K is constant 20.9%, represents oxygen content in air；

C, dust concentration imported and exported using air leak rate of air curtain and cleaner unit calculate and draw efficiency of dust collection η,

In formula, C_iRepresent cleaner unit import dust concentration, mg/dNm³；C₀Represent house outlet dust concentration, mg/ dNm³；Δ σ be air leak rate of air curtain, %；

It is characterized in that：

The error test and appraisal of the performance test are comprised the following steps：

1) air leak rate of air curtain, the parameter of dust concentration continuous mode Instrumental are obtained；

2) by the sampling quality parameter, sampling volume parameter and the step 1 that obtain in step A dust concentration continuous mode) in Instrument parameter obtains evaluated error W of dust concentration in substituting into formula (4)_c：

In formula, α_MFor the Transmitting error cofficient of Δ M,α_VFor the Transmitting error cofficient of V,W_MFor the error of balance, g；W_VFor the error of sampler (for determining the mark dry volume of flue gas), dNm³； V is to mark the sampling volume under condition, dNm³；Fume amounts of the Δ M for collection at measuring point, mg；

3) by the oxygen concentration parameter obtained during step B air leakage rate measuring and step 1) instrument parameter substitute into formula (5) obtain the evaluated error of air leak rate of air curtain：

In formula：α_inFor O_2inTransmitting error cofficient,α_outFor O_2outError propagation system Number, For the error of sampler (for determining the oxygen content of flue gas), %；O_2inFor electricity Cleaner unit admission section flue gas average oxygen content, %；O_2outFor electric cleaner Outlet Section flue gas average oxygen content, %；K is normal Number 20.9%, represents oxygen content in air；Cleaner unit is imported and exported and is measured using same model instrument；

4) by step 2) evaluated error of dust concentration and step 3) evaluated error of air leak rate of air curtain is updated in formula (6) To evaluated error W of dust removal efficiency efficiency_η：

In formula, C_iRepresent cleaner unit import dust concentration, mg/dNm³；C₀Represent house outlet dust concentration, mg/ dNm³；Δ σ be air leak rate of air curtain, %；W_ciRepresent the evaluated error of cleaner unit import flue gas concentration；W_c0Represent that house outlet flue gas is dense The evaluated error of degree；W_ΔσRepresent the evaluated error of air leak rate of air curtain.

The complete process of the error calculating step of the present invention：

(1) using weighing and direct measurement value and the dependence test such as sampling volume in smoke dust sampling and analysis continuous mode The precision of instrument draws the error calculation formula of dust concentration

The measure of dust concentration is carried out using filter cylinder often, according to the quality and sampling volume meter of filter cylinder increase before and after sampling Calculate, formula is as follows：

In formula, M₁、M₂Filter cylinder quality before and after-sampling, mg；Sampling volume under V-mark condition, dNm³；At Δ M-measuring point The fume amount of collection, mg.

Show that the evaluated error of dust concentration is by error theory, Differential Principle and (1) formula：

In formula,--- the Transmitting error cofficient of Δ M；--- the error propagation of V Coefficient；W_M--- the error of balance, g；W_V--- the error (for determining the mark dry volume of flue gas) of sampler, dNm³(wherein, W_MWith W_VIt is related to the precision of measuring instrumentss).

(2) oxygen content of smoke gas imported and exported by cleaner unit draws air leak rate of air curtain, and its computing formula is：

In formula, O_2in、O_2out- electric cleaner import and export section flue gas average oxygen content, %；K -20.9% is (in air Oxygen content, checks according to height above sea level table).

Show that the evaluated error of air leak rate of air curtain is by error theory, Differential Principle and (2) formula：

Imported and exported due to cleaner unit and be measured using same model instrument, then W_out=W_in=W_O2, (7) formula is simplified to：

In formula,——O_2inTransmitting error cofficient； ——O_2outTransmitting error cofficient,For the error of sampler (for determining the oxygen content of flue gas), %.

(3) error formula of dust concentration and air leak rate of air curtain is transmitted and is synthesized, obtained the error theory of efficiency of dust collection Computing formula

At present, the measure of efficiency of dust collection is generally adopted《Electric precipitator performance method of testing》(GB/T13931-2002) and 《Sack cleaner technical requirements》Method specified in (GB/T 6719-2009), its computing formula is：

In formula, η --- efficiency of dust collection, %；Ci, Co --- cleaner unit import and export dust concentration, mg/dNm are represented respectively³； Δ σ --- air leak rate of air curtain, %.

Show that the evaluated error of efficiency of dust collection is by error theory, Differential Principle and (3) formula：

In formula,

Therefore, (8) formula is rewritable is：

(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 step of performance of precipitator is tested includes：

A, dust concentration are determined：Flue dust is gathered using filter cylinder, sampling quality parameter and sampling volume parameter is obtained, formula is substituted into (1) dust concentration C, mg/dNm are obtained³：

$C=\frac{M_1-M_2}{V}=\frac{\mathrm{\Δ}M}{V},---\left(1\right)$

In formula, M₁For the filter cylinder quality after sampling, mg；M₂For the filter cylinder quality before sampling, mg；V is to mark the sampling volume under condition, dNm³；Fume amounts of the Δ M for collection at measuring point, mg；

B, air leakage rate measuring：Oxygen concentration parameter in measuring point measurement flue gas is imported and exported in cleaner unit respectively with flue gas analyzer, is substituted into Formula (2) obtains cleaner unit body air leak rate of air curtain Δ σ：

$\mathrm{\Δ}\mathrm{\σ}=\frac{O_{2out}-O_{2in}}{K-O_{2out}}\×100\%---\left(2\right)$

In formula, O_2inFor electric cleaner admission section flue gas average oxygen content, %；O_2outIt is average for electric cleaner Outlet Section flue gas Oxygen content, %；K is constant 20.9%, represents oxygen content in air；

C, dust concentration imported and exported using air leak rate of air curtain and cleaner unit calculate and draw efficiency of dust collection η,

$\mathrm{\η}=\frac{C_i-C_0(1+\mathrm{\Δ}\mathrm{\σ})}{C_i}\×100\%---\left(3\right)$

In formula, C_iRepresent cleaner unit import dust concentration, mg/dNm³；C₀Represent house outlet dust concentration, mg/dNm³；Δσ For air leak rate of air curtain, %；

It is characterized in that：

The error test and appraisal of the performance test are comprised the following steps：

1) air leak rate of air curtain, the parameter of dust concentration continuous mode Instrumental are obtained；

2) by the sampling quality parameter, sampling volume parameter and the step 1 that obtain in step A dust concentration continuous mode) Instrumental Parameter obtains evaluated error W of dust concentration in substituting into formula (4)_c：

$W_c=\±\frac{1}{V}\sqrt{{W_M}^2+\frac{{\mathrm{\ΔM}}^2{W_V}^2}{V^2}}---\left(4\right)$

In formula, V is to mark the sampling volume under condition, dNm³；Fume amounts of the Δ M for collection at measuring point, mg；W_MFor the error of balance, g； W_VIt is the error for determining the sampler of the mark dry volume of flue gas, dNm³；

3) by the oxygen concentration parameter obtained during step B air leakage rate measuring and step 1) instrument parameter substitute into formula (5) To the evaluated error of air leak rate of air curtain：

$W_{\mathrm{\Δ}\mathrm{\σ}}=\±\frac{W_{O_2}}{K-O_{2out}}\×\sqrt{1+{\left(\frac{K-O_{2in}}{K-O_{2out}}\right)}^2}---\left(5\right)$

In formula, O_2inFor electric cleaner admission section flue gas average oxygen content, %；O_2outIt is average for electric cleaner Outlet Section flue gas Oxygen content, %；It is the error for determining the sampler of the oxygen content of flue gas, %；K is constant 20.9%, in representing air Oxygen content.

4) by step 2) evaluated error of dust concentration and step 3) air leak rate of air curtain evaluated error be updated to formula (6) in removed Evaluated error W of dirt rate efficiency_η：

$W_{\mathrm{\η}}=\±\sqrt{{\left(\frac{1+\mathrm{\Δ}\mathrm{\σ}}{Ci}\right)}^2{W_{Co}}^2+{\[\frac{Co(1+\mathrm{\Δ}\mathrm{\σ})}{{\mathrm{Ci}}^2}\]}^2{W_{Ci}}^2+{\left(\frac{Co}{Ci}\right)}^2{W_{\mathrm{\Δ}\mathrm{\σ}}}^2}---\left(6\right)$

In formula, C_iRepresent cleaner unit import dust concentration, mg/dNm³；C₀Represent house outlet dust concentration, mg/dNm³；Δσ For air leak rate of air curtain, %；W_ciRepresent the evaluated error of cleaner unit import flue gas concentration；W_c0Represent the survey of house outlet flue gas concentration Determine error；W_ΔσRepresent 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：In step A, flue dust is dense The measure of degree：The ash sample of collection to filter cylinder is placed in 105 DEG C of baking oven and dries 2h, in being subsequently placed in exsiccator, be cooled to room temperature, Service precision is weighed for the balance of a ten thousandth.

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 Measure adopt intelligent flue gas analyser, respectively cleaner unit import and export measuring point parameter measurement is carried out using section gridding method.