CN105571652A - Indirect boiler air volume measuring method based on air volume cold-state calibration - Google Patents
Indirect boiler air volume measuring method based on air volume cold-state calibration Download PDFInfo
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- CN105571652A CN105571652A CN201510938480.0A CN201510938480A CN105571652A CN 105571652 A CN105571652 A CN 105571652A CN 201510938480 A CN201510938480 A CN 201510938480A CN 105571652 A CN105571652 A CN 105571652A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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Abstract
The invention relates to an indirect boiler air volume measuring method based on air volume cold-state calibration and belongs to the technical field of boiler control. According to the method, firstly, air volumes under different pressure heads are calibrated and corresponding fan current values are recorded in the cold state, multiple calibration points are fit into characteristic curves of current and electricity under different pressure heads with the least square method, and multiple characteristic curves form an air volume query database finally; during operation, the fan air volumes can be inquired and acquired from the air volume query database with the interpolation method through real-time fan pressure heads and current, and more accurate real-time air volumes are acquired; in the practical application process, pressure heads and current value measurement accuracy and reliability are much higher than air volume measuring elements, so that the method can accurately and quickly provide reliable air volume data for boiler operation, and the accuracy of operation control on a boiler is improved.
Description
Technical field
The invention belongs to boiler applications technical field, particularly a kind of boiler air quantity indirect measurement method demarcated based on air quantity cold conditions.
Background technology
Boiler has been deep into industry and civilian every field as main fossil energy converting apparatus, and its capacity and type are also very extensive.Due to the increase of modern boiler capacity and the development of technology, its system is increasingly sophisticated, is equipped with many utility appliance, and wherein blower fan is of paramount importance ingredient.In order to the Efficient Conversion realizing energy utilizes, the requirement for boiler implosion level is also more and more higher.High automation controls and the prerequisite of Effec-tive Function can accurately be measured each operational factor of boiler exactly.In all kinds of parameters of boiler operatiopn, the measurement of air quantity is particularly important, and the precise relation of air quantity, to the burning efficiency of as-fired coal and combustion stability, realizes on Measurement accuracy that the burning of low nitrogen subregion also needs to be based upon boiler one Secondary Air and proportioning basis in addition.But the boiler put into operation at present generally has the problem of air measuring poor accuracy.Air measuring primary element poor stability, design of measuring system are unreasonable, maintaining low SI etc. to cause the main cause of this problem to comprise.Find that a kind of reliability is high, the air measuring method of good stability, assistance high efficiency boiler is run and has great importance.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of boiler air quantity indirect measurement method demarcated based on air quantity cold conditions, to compare air quantity, can both be ensured preferably at actual application apoplexy electromechanics stream and top hole pressure measurement accuracy and reliability, therefore the present invention is by setting up blast-electric current-air quantity database and fitting to continuous print three-dimension curved surface through mathematics manipulation, the real time data of air quantity can be obtained by real-time blast and current value in boiler running process, there is reliability high, the advantage of good stability, assistance high efficiency boiler is run and has great importance.
To achieve these goals, the technical solution used in the present invention is:
A kind of boiler air quantity indirect measurement method demarcated based on air quantity cold conditions, demarcate based on air quantity cold conditions, build the database of blast, air quantity and electric current, blast in database, air quantity and electric current three variablees are fitted to three-dimension curved surface, in boiler running process, on fitting surface, obtain real-time air quantity result by blast, electric current real-time measurements.
The construction method of described database is as follows:
When boiler cold-state, fan delivery is demarcated, fan outlet pressure is regulated by fan outlet valve opening, change blower fan at the same pressure to exert oneself, manual measurement air quantity also records corresponding electric current, finally obtains a detailed blast-air quantity-current data storehouse.
Described fan outlet pressure range is 6 ~ 15kPa, measures, increase 1kPa at every turn from 5kPa; When fixing fan outlet pressure, blower fan is exerted oneself and increase gradually, be increased to 100% load gradually from 50%, increase by 5% at every turn.
Described blower fan is boiler primary air fan or overfire air fan.
Described air-blower control mode is frequency control or fluid coupling speed governing.
In the present invention, by least-squares algorithm, the blast in database, air quantity and electric current three variablees are fitted to three-dimension curved surface.
Before the measuring point that described air quantity cold conditions is demarcated is positioned at air preheater or after air preheater, by oxygen amount before and after boiler air preheater, air leak rate of air curtain is calculated, and according to air leak rate of air curtain, the air quantity after preheating is revised.
The computing formula of described air leak rate of air curtain is
wherein δ is air leak rate of air curtain, α " be excess air coefficient after air preheater,
o "
2for oxygen amount after air preheater, α ' is excess air coefficient before air preheater,
o '
2for oxygen amount before air preheater;
Describedly according to air leak rate of air curtain to the formula that the air quantity after preheating is revised be:
Q＝Q
0×(1+δ)
In formula, Q is through revised air quantity, Q
0for air measuring value.
Compared with prior art, the invention has the beneficial effects as follows:
1. indirectly obtain fan delivery value by electric current, blast, compare direct reliable measuring data and stability better.
2. the method is indirect measurement method, and without the need to once and double measurement element, implementation cost is lower.
Accompanying drawing explanation
Fig. 1 is air quantity cold conditions nominal data scatter diagram of the present invention.
Fig. 2 is the three-dimensional matching surface chart of air quantity cold conditions nominal data of the present invention.
Embodiment
Embodiments of the present invention are described in detail below in conjunction with drawings and Examples.
Embodiment 1
For 220t/h Circulating Fluidized Bed Boiler, primary air fan is the centrifugal blower of variable frequency adjustment formula, and blower fan maximum pressure is 15kPa, rated power 1000kW (10kv, 69.6A).Carrying out air quantity cold conditions timing signal, fan outlet pressure range is 11 ~ 14kPa, measures from 11kPa, increases 1kPa at every turn.Exerted oneself by blower fan when fixing fan outlet pressure and increase gradually, be increased to 100% load gradually from 50%, rotating speed increases by 5% at every turn.Different blast-electric currents-air quantity data group record is formed database, and the data obtained as shown in Figure 1
Blast-electric current-air quantity data list
Surface fitting is carried out to three variablees and makes corresponding three-dimension curved surface, as shown in Figure 2.In operational process, the real-time air quantity of fan outlet can be obtained by gathering fan outlet pressure and electric current and carry out inquiry on three-dimension curved surface.Consider air-heater leakage factor, calculated air leak rate of air preheater by air preheater gateway oxygen amount and revised primary air flow, the formula of correction is:
Q＝Q
0×(1+δ)
In formula, Q is through revised air quantity, Q
0for air measuring value, δ is air leak rate of air curtain.
The computing formula of air leak rate of air curtain δ is
wherein α " be excess air coefficient after air preheater,
o "
2for oxygen amount after air preheater, α ' is excess air coefficient before air preheater,
o '
2for oxygen amount before air preheater.
Claims (8)
1. the boiler air quantity indirect measurement method demarcated based on air quantity cold conditions, it is characterized in that, demarcate based on air quantity cold conditions, build the database of blast, air quantity and electric current, blast in database, air quantity and electric current three variablees are fitted to three-dimension curved surface, in boiler running process, on fitting surface, obtain real-time air quantity result by blast, electric current real-time measurements.
2., according to claim 1 based on the boiler air quantity indirect measurement method that air quantity cold conditions is demarcated, it is characterized in that, the construction method of described database is as follows:
When boiler cold-state, fan delivery is demarcated, fan outlet pressure is regulated by fan outlet valve opening, change blower fan at the same pressure to exert oneself, manual measurement air quantity also records corresponding electric current, finally obtains a detailed blast-air quantity-current data storehouse.
3., according to claim 2 based on the boiler air quantity indirect measurement method that air quantity cold conditions is demarcated, it is characterized in that, described fan outlet pressure range is 6 ~ 15kPa, measures, increase 1kPa at every turn from 5kPa; When fixing fan outlet pressure, blower fan is exerted oneself and increase gradually, be increased to 100% load gradually from 50%, increase by 5% at every turn.
4., according to claim 2 based on the boiler air quantity indirect measurement method that air quantity cold conditions is demarcated, it is characterized in that, described blower fan is boiler primary air fan or overfire air fan.
5., according to claim 1 based on the boiler air quantity indirect measurement method that air quantity cold conditions is demarcated, it is characterized in that, described air-blower control mode is frequency control or fluid coupling speed governing.
6., according to claim 1 based on the boiler air quantity indirect measurement method that air quantity cold conditions is demarcated, it is characterized in that, by least-squares algorithm, the blast in database, air quantity and electric current three variablees are fitted to three-dimension curved surface.
7. according to claim 1 based on the boiler air quantity indirect measurement method that air quantity cold conditions is demarcated, it is characterized in that, before the measuring point that described air quantity cold conditions is demarcated is positioned at air preheater or after air preheater, by oxygen amount before and after boiler air preheater, air leak rate of air curtain is calculated, and according to air leak rate of air curtain, the air quantity after preheating is revised.
8., according to claim 7 based on the boiler air quantity indirect measurement method that air quantity cold conditions is demarcated, it is characterized in that, the computing formula of described air leak rate of air curtain is
wherein δ is air leak rate of air curtain, α " be excess air coefficient after air preheater,
o
2" be oxygen amount after air preheater, α ' is excess air coefficient before air preheater,
o
2' be oxygen amount before air preheater;
Describedly according to air leak rate of air curtain to the formula that the air quantity after preheating is revised be:
Q＝Q
0×(1+δ)
In formula, Q is through revised air quantity, Q
0for air measuring value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510938480.0A CN105571652A (en) | 2015-12-15 | 2015-12-15 | Indirect boiler air volume measuring method based on air volume cold-state calibration |
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| CN201510938480.0A CN105571652A (en) | 2015-12-15 | 2015-12-15 | Indirect boiler air volume measuring method based on air volume cold-state calibration |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106958833A (en) * | 2017-03-28 | 2017-07-18 | 安徽博微长安电子有限公司 | A kind of biomass suspension-combustion furnace autocontrol method |
| CN109296558A (en) * | 2018-11-09 | 2019-02-01 | 天津瑞能电气有限公司 | A kind of method for fast measuring of blower actual motion air quantity |
| CN109307573A (en) * | 2018-09-26 | 2019-02-05 | 国网河北省电力有限公司电力科学研究院 | Air leak rate of air preheater test method |
| CN111721370A (en) * | 2020-05-19 | 2020-09-29 | 中国石油大学(北京) | Double-nozzle natural gas flow measuring device and system based on differential pressure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106958833A (en) * | 2017-03-28 | 2017-07-18 | 安徽博微长安电子有限公司 | A kind of biomass suspension-combustion furnace autocontrol method |
| CN106958833B (en) * | 2017-03-28 | 2019-03-08 | 安徽博微长安电子有限公司 | A kind of biomass suspension-combustion furnace autocontrol method |
| CN109307573A (en) * | 2018-09-26 | 2019-02-05 | 国网河北省电力有限公司电力科学研究院 | Air leak rate of air preheater test method |
| CN109296558A (en) * | 2018-11-09 | 2019-02-01 | 天津瑞能电气有限公司 | A kind of method for fast measuring of blower actual motion air quantity |
| CN111721370A (en) * | 2020-05-19 | 2020-09-29 | 中国石油大学(北京) | Double-nozzle natural gas flow measuring device and system based on differential pressure |
| CN111721370B (en) * | 2020-05-19 | 2022-08-26 | 中国石油大学(北京) | Double-nozzle natural gas flow measuring device and system based on differential pressure |
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Application publication date: 20160511 |
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