CN103149171B - Combustion exhaust analysis device - Google Patents
Combustion exhaust analysis device Download PDFInfo
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- CN103149171B CN103149171B CN201210507048.2A CN201210507048A CN103149171B CN 103149171 B CN103149171 B CN 103149171B CN 201210507048 A CN201210507048 A CN 201210507048A CN 103149171 B CN103149171 B CN 103149171B
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- gas concentration
- gas
- concentration lwevel
- sample air
- lwevel
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Abstract
The invention provides a combustion exhaust analysis device enabling a measurer to identify errors of measurements of a CO2 sensor. An operation processing part (32) comprises an operation unit (34), a correcting unit (36), a correlativity data hold part (37), a carbon dioxide concentration presumption unit (38) and a carbon dioxide concentration error presumption unit (40). The correlativity data hold part (37), the carbon dioxide concentration presumption unit (38) and the carbon dioxide concentration error presumption unit (40) are used for evaluating the accuracy of the measurement of carbon dioxide concentration used in correcting of component concentration of a measurement target by the correcting unit (36). In order that the accuracy of the carbon dioxide concentration of sample gas obtained according to a signal acquired by the CO2 sensor (14) can be judged, the measurement of an O2 sensor (24) in the device is used.
Description
Technical field
The present invention relates to a kind of using burning gases such as the burning and gas-exhaustings in thermal power plant as sample air, to the S0 in sample air
2and the concentration of NOx, CO carries out the burning and gas-exhausting analytical equipment of continuous measurement.
Background technology
S0 in the burning and gas-exhausting that thermal power plant etc. produce
2and the concentration general infrared absorbing type gas analyzer of the composition such as NOx, CO is measured continuously.The test section of infrared absorbing type gas analyzer comprises: the sample chamber that the burning and gas-exhausting for making as sample air circulates; Sample chamber is irradiated to the light source measuring light; With according to through the measurement light of sample chamber, the measuring transducer detected the concentration of the predetermined component in sample chamber is (see patent document 1.）。
Be provided with S0 in test section
2and the concentration of the respective composition such as NOx, CO carries out the measuring transducer measured.Each measuring transducer possesses the room enclosed by the gas of each measuring object composition, by making the measurement light through sample chamber pass through these indoor, optionally measures the infrared ray in the absorbing wavelength region of measuring object composition.
Also containing C0 in burning and gas-exhausting
2.There is C0
2infrared ray absorbing wavelength band and S0
2and the absorbing wavelength band portion of NO, CO is overlapping, C0
2concentration to S0
2and the measured value of the concentration of NO, CO produces the problem of interference effect.In order to suppress because of C0
2and the interference to measured value caused, at the light incident side of the room of detector, be generally configured with C0
2infrared ray absorbing wavelength region light remove filter or by CO
2the pneumatic filter that gas is enclosed.
But, in these filters, because do not have can by C0
2the light of infrared ray absorbing wavelength region remove completely, thus arrange the CO in sample air separately
2concentration carries out the CO measured
2sensor, with the CO recorded
2concentration is come S0
2and the measured value of the concentration of NO, CO is revised.In addition, as CO
2sensor, adopts thermoelectric pickup etc.
Prior art document
Patent document
Patent document 1 Japanese Unexamined Patent Publication 10-82740 publication
Summary of the invention
The problem that invention will solve
Due to the S0 as measuring object composition
2and the certainty of measurement that the concentration requirement of NO, CO is higher, often adopt calibrating gas to correct termly to each measuring transducer that these compositions detect.On the contrary, S0 is carried out to being used for
2and the C0 of the concentration correction of NO, CO
2concentration but do not pay attention to its certainty of measurement, thus to CO
2sensor carries out the regular calibration in expense time hardly.
CO
2the zero correction of sensor can to S0
2and the sensor of the measuring object composition such as NO, CO carries out when carrying out zero correction together.But, need CO in addition because SPAN corrects
2calibrating gas, thus often between longer-term (such as several months or several years) do not carry out SPAN correction state under and used.For this reason, even if because of CO
2the exception of the drift of sensor or fault etc. and cause CO
2measured value produces larger error, and gauger is this exception of None-identified also.Due to gauger's None-identified CO
2the measured value of sensor is abnormal, so exist with the CO comprised compared with big error
2the measured value of concentration is to S0
2and the measured value of NO, CO is revised, and thus makes S0
2and the problem that the certainty of measurement of NO, CO is deteriorated.
Therefore, the present invention enables gauger identify CO
2for the purpose of the error of the measured value generation of sensor.
For solving the means of problem
Burning and gas-exhausting analytical equipment of the present invention, is characterized in that, comprising: measuring transducer, it possesses the sample chamber for making sample air circulate, and measuring light, sending the signal of the concentration of the measuring object composition in sample air by irradiating this sample chamber; Carbon dioxide sensor, it, according to the measurement light through sample chamber, sends the signal of the gas concentration lwevel in sample air; Oxygen sensor, it sends the signal of the oxygen concentration in sample air; Arithmetic processing section, comprising: the measuring object composition arithmetic element obtaining the measuring object constituent concentration in sample air according to the signal of measuring transducer; The gas concentration lwevel arithmetic element of the gas concentration lwevel in sample air is obtained according to the signal of carbon dioxide sensor; The oxygen concentration arithmetic element of the oxygen concentration in sample air is obtained according to the signal of oxygen sensor; And with the amending unit that the gas concentration lwevel that gas concentration lwevel arithmetic element is tried to achieve is revised measuring object constituent concentration, arithmetic processing section possesses: the dependency relation data of the oxygen concentration in sample air and gas concentration lwevel to be carried out the dependency relation data retention portion kept; According to the dependency relation data that dependency relation data retention portion keeps, the gas concentration lwevel presumption unit that the oxygen concentration of being tried to achieve by oxygen concentration arithmetic element estimates the gas concentration lwevel in sample air; And gas concentration lwevel estimated gas concentration lwevel that unit estimates and the gas concentration lwevel that gas concentration lwevel arithmetic element is tried to achieve compares, when the difference of two gas concentration lwevels exceedes a reference value preset, be judged to be abnormal gas concentration lwevel error identifying unit.
The effect of invention
The present invention makes based on setting up this knowledge of certain dependency relation between concentration oxygenous in burning and gas-exhausting and the concentration of carbon dioxide.In the past, the oxygen sensor that the concentration being generally provided with oxygen contained in sample air in burning and gas-exhausting analytical equipment is measured, based on the measured value of this oxygen sensor, can infer the concentration of carbon dioxide contained in sample air.In the present invention, be that the presumed value of gas concentration lwevel in the sample air obtained by the measured value based on oxygen sensor carries out utilizing as the determinating reference of the accuracy of the measured value of carbon dioxide sensor.
Namely, burning and gas-exhausting analytical equipment of the present invention, its signal based on measuring transducer and carbon dioxide sensor obtains the concentration of each composition and the arithmetic processing section of carrying out computing comprises: the dependency relation data retention portion kept the dependency relation data of the oxygen concentration in sample air and gas concentration lwevel; Signal based on oxygen sensor obtains the oxygen concentration arithmetic element of the oxygen concentration in sample air; The gas concentration lwevel presumption unit that the oxygen concentration that the dependency relation data kept based on dependency relation data retention portion are tried to achieve by oxygen concentration arithmetic element estimates the gas concentration lwevel in sample air; And gas concentration lwevel estimated the gas concentration lwevel that the gas concentration lwevel of unit presumption and gas concentration lwevel arithmetic element try to achieve and compare, when the difference of two gas concentration lwevels exceedes a reference value preset, be then judged to be abnormal gas concentration lwevel error identifying unit.Thus, when the gas concentration lwevel that the correction of the measured value to measuring object constituent concentration uses error for more than certain time, just can be judged to be exception, easily can identify the deterioration of the certainty of measurement of gas concentration lwevel.
Accompanying drawing explanation
Fig. 1 is the summary construction diagram of the embodiment that burning and gas-exhausting analytical equipment is shown.
Fig. 2 is the summary construction diagram of an example of the structure that test section is shown.
Fig. 3 is used to illustrate the chart of the dependency relation between oxygen concentration in flue gas and gas concentration lwevel.
Detailed description of the invention
In a preferred embodiment of the invention, also comprise: when gas concentration lwevel error identifying unit is judged to be abnormal, to the abnormal show portion that these abnormal conditions show.Thus, gauger more easily can identify the exception of the measured value of gas concentration lwevel.
Below, with reference to Fig. 1, burning and gas-exhausting analytical equipment embodiment is described.
Be provided with the sample air stream 2 for sample air being imported and be used for the reference gas stream 3 of reference gas importing.Sample air stream 2 and reference gas stream 3 are all connected switching mechanism 16 and are connected with stream.
Stream connects switching mechanism 16 and is made up of two magnetic valve 16a and 16b.Sample air stream 2 is switched to the one party measured in stream 4 or gas exhaust stream 5 and connects by magnetic valve 16a; Reference gas stream 3 is switched to gas exhaust stream 5 by magnetic valve 16b or the one party measured in stream 4 connects.Control magnetic valve 16a and 16b, to make when sample air stream 2 is connected with measurement stream 4, reference gas stream 3 is connected with gas exhaust stream 5; When sample air stream 2 is connected with gas exhaust stream 5, reference gas stream 3 is connected with measurement stream 4.Gas exhaust stream 5 is provided with needle-valve 20.Needle-valve 20 is to adjust when carrying out sample air and reference gas switches, to make 0
2the sample air flow flowed in sensor 24 can not change because of the difference of flow path resistance and arrange.
Measurement stream 4 is configured with test section 10.Flowmeter 18 is provided with in the downstream measuring the test section 10 on stream 4.To carry out later describing about test section 10.
Sample air stream 2 is connected with and possesses 0
2the oxygen measurement stream 6 of sensor 24.Oxygen measurement stream 6 is used to a part for the sample air of flowing in sample air stream 2 to take out with the stream measured the oxygen concentration in sample air.0
2sensor 24 sends the signal corresponding to oxygen concentration; 0
2the signal that sensor 24 sends is taken into arithmetic processing section 32.Oxygen measurement stream 6 is also provided with needle-valve 26.Reference gas stream 3 is connected with one end of flow adjustment stream 8.Flow adjustment stream 8 leads to excretory duct 30, and has capillary 28, in order to the flow of the reference gas of subtend test section 10 side supply carries out adjusting arranging.
Test section 10 comprises: to S0 contained in sample air
2and the concentration of the composition of NO, CO etc. carries out the measuring transducer 12 detected and the CO detected the concentration of carbon dioxide contained in sample air
2sensor 14.Utilize measuring transducer 12 can obtain the signal corresponding to the concentration of measuring object composition; Utilize CO
2sensor 14 can obtain the signal corresponding to gas concentration lwevel.By measuring transducer 12 and CO
2the signal that sensor 14 obtains is taken into arithmetic processing section 32.
Arithmetic processing section 32 comprises: arithmetic element 34, amending unit 36, dependency relation data retention portion 37, gas concentration lwevel presumption unit 38 and gas concentration lwevel error identifying unit 40.
Arithmetic element 34 carries out basis by measuring transducer 12 or CO
2sensor 14 and 0
2the signal that sensor 24 obtains is to obtain S0
2and the computing of measuring object constituent concentration, gas concentration lwevel and the oxygen concentration such as NO, CO.This arithmetic element 32 comprises gas concentration lwevel arithmetic element and oxygen concentration arithmetic element.
Amending unit 36 utilizes the gas concentration lwevel of trying to achieve equally to revise to the measuring object constituent concentration of being tried to achieve by arithmetic element 34.The measuring object constituent concentration revised by amending unit 36 is shown in display part 42 in real time as measured value.
The precision that dependency relation data retention portion 37, gas concentration lwevel presumption unit 38 and gas concentration lwevel error identifying unit 40 are used for being used in amending unit 36 measured value of the gas concentration lwevel of the correction of measuring object constituent concentration is evaluated.In order to according to by CO
2whether the gas concentration lwevel in the sample air that the signal that sensor 14 obtains is obtained correctly judges, be provided with in operative installations 0
2the measured value of sensor 24.In addition, this evaluation can be set as that (such as, one month) carries out during certain, and gauger also can carry out at any time.
Gas concentration lwevel in burning gases and have certain dependency relation between oxygen concentration.Fig. 3 is the chart of the dependency relation representing gas concentration lwevel in the burning gases of coal, heavy oil and natural-gas and oxygen concentration.As indicates, the gas concentration lwevel in burning gases and oxygen concentration are roughly linear relation, and such as, the gas concentration lwevel in the burning gases of coal and the relation between oxygen concentration can be represented approx by following formula (1).
CO
2concentration=-0.9 × 0
2concentration+18.7(1)
Burning gases for heavy oil or natural-gas also can be represented by same linear formula approx.The approximate expression that the formula (1) corresponding to the kind of the fuel as coal or heavy oil, natural-gas is such is maintained in dependency relation data retention portion 37, before starting to measure, gauger is by inputting arithmetic processing section 32 by the kind of fuel, select the approximate expression of the dependency relation corresponding with the burning gases of this fuel, be used in the presumption of gas concentration lwevel described later.
Gas concentration lwevel presumption unit 38 uses the approximate expression be held in dependency relation data retention portion 37, and according to the oxygen concentration that arithmetic element 34 is tried to achieve, the gas concentration lwevel in sample air is estimated.
Gas concentration lwevel error identifying unit 40 using gas concentration lwevel presumption unit 38 presumed value of trying to achieve as judgment standard, to according to by CO
2whether the gas concentration lwevel in the sample air that the signal that sensor 14 obtains is obtained correctly judges.Particularly, to according to by CO
2the error that gas concentration lwevel calculated by the signal that sensor 14 obtains and gas concentration lwevel estimate the gas concentration lwevel calculated by unit 38 whether in certain allowed band (presumed value of such as gas concentration lwevel ± 3vol% within) judge, if outside allowed band, just be judged to be "abnormal", in display part 42, these abnormal conditions shown.
Such as when sample air is the burning gases of coal, by CO
2gas concentration lwevel (the CO that the signal of sensor 14 is tried to achieve
2concentration measurement) when meeting following formula (2) or (3), be then judged to be "abnormal".
CO
2concentration measurement >-0.9 × 0
2concentration+(18.7+3) (2)
CO
2concentration measurement <-0.9 × 0
2concentration+(18.7-3) (3)
Arithmetic processing section 32 can by the CPU(central operation treating apparatus of the special computer of such as this analytical equipment or personal computer) and data storage realize, display part 42 can be realized by the monitor of special computer or personal computer.
In addition, the structure had as shown in Figure 2 can be enumerated as test section 10.Below, the structure of test section in Fig. 2 10 is described.
Test section 10 is non-dispersive type INFRARED ABSORPTION photometer, comprising: light source 44, sample chamber 46, CO
2filter 48, measuring transducer 12a, 12b, 12c and CO
2sensor 14.Sample air or reference gas flow through sample chamber 46, carry out measurement illumination penetrate by light source 44 pairs of sample chambers 46.Across sample chamber 46 side contrary with light source 44, be configured with CO successively from sample chamber 44 side
2filter 48, measuring transducer 12a, 12b, 12c and CO
2sensor 14.
CO
2filter 48 is by being sealed with C0
2room composition, by making the measurement light process through sample chamber 46, from measurement light remove C0
2absorbing wavelength composition.Measuring transducer 12a, 12b, 12c comprise and are sealed with S0 respectively
2and the some rooms in NO, CO.
Each measuring transducer 12a, 12b and 12c are by allowing through sample chamber 46 and CO
2the measurement light of filter 48, through respective room, obtains the signal corresponding to the concentration of the measuring object composition in the gas flowing through sample chamber 46.The measuring object composition of each measuring transducer 12a, 12b and 12c is, such as, measuring transducer 12a is S0
2; Measuring transducer 12b is NO; Measuring transducer 12c is CO.The signal obtained by each measuring transducer 12a, 12b and 12c is taken into arithmetic processing section 32, is carried out the computing of the concentration obtaining each measuring object composition by the arithmetic element 24 of arithmetic processing section 32.
CO
2sensor 14 accepts to have passed through sample chamber 46, CO
2the measurement light of filter 48, measuring transducer 12a, 12b, 12c, intensity carbon dioxide to the light of absorbing wavelength detects.CO when flowing through sample chamber 46 according to sample air and when reference gas flows through sample chamber 46
2the difference of the signal strength signal intensity of sensor 14 can obtain the CO in sample air
2concentration.The structure of gas concentration lwevel error identifying unit 40 is: the gas concentration lwevel in the sample air of try to achieve arithmetic element 34 and gas concentration lwevel estimate the gas concentration lwevel that unit 38 deduces and compare, when the difference of two gas concentration lwevels is more than certain value (such as more than 3%) time, be then judged to be exception.
In addition, CO
2sensor 14 can be realized by such as electrothermic type sensor.
Symbol description
2 sample air streams
3 reference gas streams
4 measure stream
5 gas exhaust streams
6 oxygen measurement streams
8 bypass flow path
10 test sections
12 measuring transducers
14 CO
2sensor
16 streams connect switching mechanism
18 flowmeters
20,26 needle-valves
24 0
2sensor
28 capillaries
30 excretory ducts
32 arithmetic processing section
34 arithmetic elements
36 amending units
37 dependency relation data retention portion
38 gas concentration lwevel presumption unit
40 gas concentration lwevel error identifying units
42 display parts.
Claims (2)
1. a burning and gas-exhausting analytical equipment, it comprises:
Measuring transducer, it possesses the sample chamber for making sample air circulate, and measuring light, sending the signal corresponding to the concentration of the measuring object composition in sample air by irradiating this sample chamber;
Carbon dioxide sensor, it, according to the measurement light through described sample chamber, sends the signal corresponding to the gas concentration lwevel in sample air;
Oxygen sensor, it sends the signal corresponding to the oxygen concentration in described sample air;
Arithmetic processing section, it comprises: the measuring object composition arithmetic element obtaining the measuring object constituent concentration in sample air according to the signal of described measuring transducer; The gas concentration lwevel arithmetic element of the gas concentration lwevel in sample air is obtained according to the signal of described carbon dioxide sensor; The oxygen concentration arithmetic element of the oxygen concentration in sample air is obtained according to the signal of described oxygen sensor,
The feature of described burning and gas-exhausting analytical equipment is,
Described arithmetic processing section comprises: the amending unit that the gas concentration lwevel of trying to achieve by described gas concentration lwevel arithmetic element is revised described measuring object constituent concentration; The dependency relation data of the oxygen concentration in sample air and gas concentration lwevel are carried out the dependency relation data retention portion kept; According to the dependency relation data that described dependency relation data retention portion keeps, the gas concentration lwevel presumption unit that the oxygen concentration of being tried to achieve by described oxygen concentration arithmetic element estimates the gas concentration lwevel in sample air; And the gas concentration lwevel that the gas concentration lwevel to be estimated by described gas concentration lwevel presumption unit and described gas concentration lwevel arithmetic element are tried to achieve compares, when the difference of two gas concentration lwevels exceedes a reference value preset, be judged to be abnormal gas concentration lwevel error identifying unit.
2. burning and gas-exhausting analytical equipment according to claim 1, also comprises abnormal show portion, when described gas concentration lwevel error identifying unit is judged to be abnormal, shows these abnormal conditions.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011266382A JP5729285B2 (en) | 2011-12-06 | 2011-12-06 | Combustion exhaust gas analyzer |
| JP2011-266382 | 2011-12-06 |
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|---|---|
| CN103149171A CN103149171A (en) | 2013-06-12 |
| CN103149171B true CN103149171B (en) | 2015-03-25 |
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|---|---|---|---|
| CN201210507048.2A Active CN103149171B (en) | 2011-12-06 | 2012-11-30 | Combustion exhaust analysis device |
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| JP (1) | JP5729285B2 (en) |
| CN (1) | CN103149171B (en) |
Families Citing this family (9)
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| CN106442857B (en) * | 2016-10-20 | 2018-10-23 | 杭州经略科技服务有限公司 | A kind of CO2 emission detection method based on determination of oxygen content |
| JP6951167B2 (en) * | 2016-11-29 | 2021-10-20 | 株式会社堀場製作所 | Gas analyzer and gas analysis method |
| DE102017201742A1 (en) * | 2017-02-03 | 2018-08-09 | Robert Bosch Gmbh | Method for heating and regenerating a particulate filter in the exhaust gas of a gasoline engine |
| CN107036994A (en) * | 2017-05-25 | 2017-08-11 | 北京雪迪龙科技股份有限公司 | A kind of non-dispersion infrared gas analyzer of dynamic reference and the method for detecting gas concentration |
| CN109557869A (en) * | 2018-11-27 | 2019-04-02 | 江苏方天电力技术有限公司 | A kind of fired power generating unit carbon emission on-line monitoring management system |
| EP3772644A1 (en) * | 2019-08-06 | 2021-02-10 | Siemens Aktiengesellschaft | Non-dispersive infrared gas analyzer for determining at least two gas components in a measuring gas |
| CN114754496B (en) * | 2020-12-29 | 2024-03-08 | 芜湖美的厨卫电器制造有限公司 | Control method of gas water heater, gas water heater and readable storage medium |
| JP2022186267A (en) * | 2021-06-04 | 2022-12-15 | 株式会社島津製作所 | gas measuring device |
| WO2024034487A1 (en) * | 2022-08-08 | 2024-02-15 | 株式会社島津製作所 | Gas measurement device |
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| Publication number | Publication date |
|---|---|
| CN103149171A (en) | 2013-06-12 |
| JP5729285B2 (en) | 2015-06-03 |
| JP2013120058A (en) | 2013-06-17 |
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