CN102252991A - Ultraviolet differential flue gas concentration monitoring system through heat and moisture extraction process - Google Patents
Ultraviolet differential flue gas concentration monitoring system through heat and moisture extraction process Download PDFInfo
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- CN102252991A CN102252991A CN2011101484573A CN201110148457A CN102252991A CN 102252991 A CN102252991 A CN 102252991A CN 2011101484573 A CN2011101484573 A CN 2011101484573A CN 201110148457 A CN201110148457 A CN 201110148457A CN 102252991 A CN102252991 A CN 102252991A
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Abstract
The invention relates to an ultraviolet differential flue gas concentration monitoring system through the heat and moisture extraction process, belonging to a flue gas monitoring device. A probe is directly inserted into a flue and connected with a heater, a filter and a measuring pool, which are placed in a heat tracing box, and a measuring light path and a light spectrum are not affected by temperature, flue dust, moisture and the like in the flue; full filtration of dust and other solid impurities is ensured; the heat tracing box can well control the temperature of extracted gas to be consistent with that of the gas in the flue, thereby ensuring the consistent size of the absorption section; the system is provided with a calibration device, thereby realizing on-line zero and full calibration; a measuring region can not deform due to the temperature of the flue and the adjustment of the light spectrum is simple; water interference in flue gas is removed in an ultraviolet differential manner, thereby realizing standard dry conversion; and the requirements on a site environment are reduced, and the ultraviolet differential flue gas concentration monitoring system is suitable for more sites.
Description
Technical field
The invention belongs to a kind of flue gas on-Line Monitor Device, particularly a kind of heat extraction method ultraviolet difference flue gas concentration monitor system that wets.
Background technology
The harmful gas of fixed-contamination source emission is mainly by sulphuric dioxide SO
2And oxides of nitrogen (NOx) formation, they are to cause the main dusty gas of air-polluting, country progressively increases for the input and the attention degree of flue gas monitoring.At present, the monitoring method that fume continuous monitoring system is taked mainly contains three kinds: the one, and the dilution extraction method, this method outside flue, is diluted fume extraction simultaneously, thereby is utilized dilution to measure to extracting gas, and advantage is that precision is good.The 2nd, direct extraction method, this method equally with fume extraction outside flue, but do not dilute extracting gas, extract the pneumatolytic branch but utilize various analytical instrument directly to analyze.These two kinds all are based on extraction method and measure.The third is a direct insertion method, and it is that probe is directly inserted in the flue, and extracting gases sensor flue gas direct and in the flue does not contact, and measures.On the detection principle of sulphuric dioxide and oxides of nitrogen, preceding two kinds based on removable method, often adopt electrochemical method to measure, then a kind of card edge type often adopts the ultraviolet difference absorption spectroscopy to measure.These three kinds of methods respectively have relative merits (seeing Table 1):
Three kinds of monitoring method contrasts of table 1
There is following several problem simultaneously in direct insertion method:
One, technical elements
1, directly insert difficult realization of on-line calibration of metering system, be the technical barrier of this industry always.
2, it is high temperature resistant to solve probe, and the scene temperature height surpasses 200 ℃, and instrument in use following problem can occur:
A, probe distortion owing to the flue-gas temperature height, add sonde configuration and installation question, can cause the probe distortion, and this moment, spectrum descended seriously, on-the-spot spectrum debug difficulties, and head it off needs to improve sonde configuration;
B, poly-PTFE melt, and temperature is too high, can cause poly-tetrafluoro deliquescing, distortion, cause light path to stop up, and head it off, need more conversion materials.
3, the probe gas consumption is big, and source of the gas is unclean, causes probe to pollute
Existing probe uses pressurized air, and gas consumption is bigger, and the scene provides the problem of clean gas source little, if on-the-spot no source of the gas provides the source of the gas maintenance issues big, the scene has source of the gas can not guarantee the cleaning of source of the gas, makes the maintenance of instrument very big.
When 4, steam was big, light signal was seriously decayed.
5, during the water-vapo(u)r saturation state, water exists with liquid and two kinds of forms of gaseous state, and there is certain error in the moisture measurement meeting, and the hygronom of on-line measurement at present can't address this problem, and the moisture that can only measure gaseous form how much.
Two, rig-site utilization aspect
1, the on-the-spot more complicated of installing, large-scale monitoring platform and Control Room need be built in the scene.
2, based on the restriction of spectrometer signal wire length, probe and mainframe need be placed on the same monitoring platform, and very inconvenient client checks data, parameter and maintenance are set.
3, under the wet desulphurization situation, eyeglass easily pollutes.
4, site environment is abominable, and vibrations are big, the pollution of dirt and sulfide, and when equipment was placed on the scene, can shorten greatly serviceable life, and deuterium lamp, paraboloidal mirror, optical fiber, electron device life-span seriously shorten.
5, analytic system (DAS) operation stability is poor.
6, during frequent maintenance, can't guarantee 45 minutes valid data of one hour.
Three, maintenance aspect
1, under high humidity, the high dirt situation, steam is big, and spectrum descends fast, and maintenance is big, causes measuring accuracy to descend.
2,, when installing, eminence bothers relatively during maintenance, repair because of mainframe can't separate with probe.
Generally speaking, the influence of the interference component in the flue is avoided in the measurement of extraction method easily, thereby obtains higher measuring accuracy; The advantage of direct insertion method is relatively simple for structure, is easy to realize.
Summary of the invention
Purpose of the present invention is at the defective of existing card edge type fume continuous monitoring system, mainly contain interference component, gas temperature, gaseous tension in the tested gas according to environment for the influence of difference ultraviolet absorption spectroscopy, design the wet extraction method fume continuous monitoring system of a kind of heat based on difference ultraviolet absorption spectroscopy measuring principle, its filtering system has guaranteed the abundant filtration of dust and other solid impurities; It is consistent with the temperature of gas in flue to accompany hot case can control the temperature of extracting gases well, has guaranteed that the size of absorption cross section is consistent.
The objective of the invention is to be achieved through the following technical solutions: a kind of heat extraction method ultraviolet difference flue gas concentration monitor system that wets, it is characterized in that: it comprises probe, measuring cell, caliberating device and dust-collecting bucket;
The front end of probe is shaped on the hot flange of the companion who is connected with flue, the rear end of probe is provided with air intake opening and gas outlet, air intake opening is connected purification of compressed air by pipeline with valve, the gas outlet is connected electric tracing pipe and pressurized air pilot piping respectively by pipeline and valve, and the pressurized air pilot piping connects purification of compressed air;
Accompany in the hot case and install and measure the pond, deuterium lamp is installed in the front end of measuring cell, spectrometer is connected by optical fiber with the measuring cell rear end, measuring cell is cylindric, the lining of inner installation and its uniform internal diameter, the front end of measuring cell is installed flat mirror, convex lens are installed in the rear end, on the sidewall of the measuring cell of the front of flat mirror back and convex lens, be provided with input pipe and efferent duct, the input pipe of measuring cell connects filtrator and well heater successively by pipeline, and well heater connects the electric tracing pipe by pipeline, is connected with the probe gas outlet, well heater is by pipeline caliberating device in parallel, caliberating device comprises demarcation pipeline and the purification of compressed air pipeline that is connected in parallel, and on the demarcation pipeline flow is installed and is taken into account valve, connects calibrating gas, purification of compressed air pipeline mounted valve connects purification of compressed air; The efferent duct of measuring cell connects oxygen level sensor, pressure transducer and the Temperature Humidity Sensor that is arranged in parallel by pipeline, oxygen level sensor connect successively the installation gravity condenser that is arranged in parallel and peristaltic pump discharge pipe line, be provided with the exhaust pipe of diaphragm pump and be provided with the gas exhaust piping of valve, be connected with dust-collecting bucket respectively.
The heating box temperature alarm is installed in the hot case of said companion.
Temperature controller is installed in the hot case of said companion to be connected.
Advantage of the present invention and beneficial effect are:
1, can realize online zero, the full calibration of system;
2, adopt the measurement of bleeding, measuring cell is measured light path and spectrum and not influenced by the interior temperature of flue, flue dust, humidity etc. not in flue;
3, the compressed gas consumption significantly reduces, and the source of the gas cleanliness factor is required to reduce;
4, measured zone can be because of flue temperature be out of shape, and the spectrum adjustment is simple than card edge type;
5, on-the-spot platform building is required to reduce, site environment is required to reduce, more on-the-spotly can adapt to;
6, adopt hot wet method, the humidity on-line measurement does not exist the cold dried component that causes of cryochem to lose problem, and ultraviolet difference can be got rid of the interference of moisture in the flue gas, can realize marking simultaneously doing and change.
7, for the wet extraction method of heat, filtering system has guaranteed the abundant filtration of dust and other solid impurities.
8, owing to designed the hot case of companion, the temperature that can control extracting gases well is consistent with the temperature of gas in flue, has guaranteed that the size of absorption cross section is consistent.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Wherein: 1-accompanies hot case, 2-measuring cell, 3-deuterium lamp, 4-spectrometer, 5-optical fiber, the 6-lining, the flat mirror of 7-, 8-convex lens, 9-pipeline, 10-filtrator, the 11-well heater, 12-electric tracing pipe, the 13-probe, 14-accompanies hot flange, the 15-pneumatic valve, 16-solenoid valve, 17-flowmeter, 18-oxygen level sensor, the 19-pressure transducer, 20-Temperature Humidity Sensor, 21-gravity condenser, 22-peristaltic pump, the 23-diaphragm pump, 24-dust-collecting bucket, 25-heating box temperature alarm, 26-temperature controller.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Embodiment: as shown in Figure 1, a kind of heat extraction method ultraviolet difference flue gas concentration monitor system that wets, accompany in the hot case 1 and install and measure pond 2, deuterium lamp 3 is installed in the front end of measuring cell 2, spectrometer 4 is connected with measuring cell 2 rear end optical fiber 5, measuring cell 2 is cylindric, the lining 6 of uniform internal diameter is installed in the measuring cell 2, the front end of measuring cell 2 is installed flat mirror 7, convex lens 8 are installed in the rear end, on the sidewall of the measuring cell 2 of the front of the back of flat mirror 7 and convex lens 8, be provided with input pipe and efferent duct, the input pipe of measuring cell 2 connects filtrator 10 by pipeline 9, filtrator 10 is connected with well heater 11 by pipeline 9, well heater 11 connects electric tracing pipe 12 through accompanying the gas access that is provided with on the hot case 1, the front end of probe 13 is installed the hot flange 14 of companion, in the insertion flue, the rear end of probe 13 is provided with air intake opening and gas outlet, the gas outlet connects pneumatic valve 15 interface A, electric tracing pipe 12 connects pneumatic valve 15 interface B, pneumatic valve 15 interface C are by pipeline 9, solenoid valve DCF2 16 connects purification of compressed air, pop one's head in the air intake opening of 13 ends by pipeline 9, solenoid valve DCF1 16 connects purification of compressed air, the pipeline 9 that is connected with calibrating gas in parallel on the pipeline 9 between well heater 11 and the gas access, this pipeline 9 is provided with two-way electromagnetic valve DCF8 16 and flowmeter 17, and connects calibrating gas SO
2With NOx and N, the pipeline 9 that is connected with purification of compressed air in parallel on the pipeline 9 that connects calibrating gas, two-way electromagnetic valve DCF6 16 is installed on this pipeline 9, the efferent duct of measuring cell 2 connects oxygen level sensor 18, pressure transducer 19 and the Temperature Humidity Sensor 20 that is arranged in parallel by pipeline 9, oxygen level sensor 18 connect successively the installation gravity condenser 21 that is arranged in parallel and peristaltic pump 22 discharge pipe line 9, be provided with the exhaust pipe 9 of diaphragm pump 23 and be provided with the gas exhaust piping 9 of two-way electromagnetic valve DCF7 16, be connected with dust-collecting bucket 24 respectively; Accompany in the hot case 1 heating box temperature alarm 25 and temperature controller 26 are installed.
Principle of work:
Hot wet method is divided into measurement state, align mode, probe blowback state and measuring cell blowback state when working; The effect of diaphragm pump provides the power of bleeding, and the effect of peristaltic pump is that the condensate water of gravity condenser is discharged in the dust-collecting bucket;
(1) measurement state:
Turn-off solenoid valve DCF1, DCF2, DCF6, DCF7 and DCF8, connect diaphragm pump, begin to bleed, flue gas enters from probe, the electric tracing pipe of flowing through, enter the hot case of companion, companion's heater temperature is controlled by temperature controller, and gas flows through well heater in the hot case of companion, and well heater makes the temperature constant of the hot case of companion on the flue actual temperature, the gas that extracts is removed impurity such as dust via filtrator, fume extraction is sent ultraviolet-visible light by the ultraviolet source deuterium lamp in the measuring cell of the hot case of companion, this light beam incides the flat mirror of measuring cell, the light beam planoconvex lens of decaying after smoke absorption converges at optical fiber and imports spectrometer into, carries out SO according to ultraviolet difference absorption spectrum ratio juris
2, NO, N
2Ultraviolet spectroscopy measure, simultaneously measure temperature, humidity, oxygen amount and pressure and other parameters by corresponding pressure, Temperature Humidity Sensor and oxygen level sensor, final tail gas by the measuring cell efferent duct by pipeline after the gravity condenser condenses, condensate water is discharged into the dust-collecting bucket from peristaltic pump, and the gas part is discharged from diaphragm pump.
(2) align mode
Close diaphragm pump earlier, again according to the requirement of demarcating, corresponding calibrating gas SO
2, NO, N
2Receive on the pipeline, turn-off solenoid valve DCF1 and DCF6, connect solenoid valve DCF2, DCF7 and DCF8, at this moment, the gas circuit at flue gas probe place is disconnected, gas can't circulate, gas enters flowmeter, enter the hot case of companion by solenoid valve DCF8, companion's heater temperature is controlled by temperature controller, and gas flows through well heater in the hot case of companion, and well heater makes the temperature constant of the hot case of companion on the flue actual temperature, the gas that extracts is removed impurity such as dust via filtrator, fume extraction is sent ultraviolet-visible light by the ultraviolet source deuterium lamp in the measuring cell of the hot case of companion, this light beam incides the flat mirror of measuring cell, the light beam planoconvex lens of decaying after smoke absorption converges at optical fiber and imports spectrometer into, carries out SO according to ultraviolet difference absorption spectrum ratio juris
2, NO, N
2Ultraviolet spectroscopy measure, measure temperature, humidity, oxygen amount and pressure and other parameters by corresponding pressure, Temperature Humidity Sensor and oxygen level sensor simultaneously, then, DCF7 is discharged in the dust-collecting bucket by solenoid valve.
(3) probe blowback state
Close diaphragm pump, turn-off solenoid valve DCF6, DCF7, DCF8, connect solenoid valve DCF1, DCF2, wherein DCF2 keeps connecting always, and DCF1 connected one second, turn-offed 5 seconds, so repeatedly.
(4) measuring cell blowback state:
Close diaphragm pump, turn-off solenoid valve DCF1, DCF8, connect solenoid valve DCF2, DCF6, DCF7, at this moment, the gas circuit at flue gas probe place is disconnected, and gas can't circulate, and purification of compressed air enters the hot case of companion by solenoid valve DCF6, flow through well heater, filtrator, measuring cell, pressure transducer, Temperature Humidity Sensor and oxygen level sensor in the hot case of companion, DCF7 is discharged in the dust-collecting bucket by solenoid valve.
Claims (3)
1. the wet extraction method ultraviolet difference flue gas concentration monitor system of a heat, it is characterized in that: it comprises probe, measuring cell, caliberating device and dust-collecting bucket;
The front end of probe is shaped on the hot flange of the companion who is connected with flue, the rear end of probe is provided with air intake opening and gas outlet, air intake opening is connected purification of compressed air by pipeline with valve, the gas outlet is connected electric tracing pipe and pressurized air pilot piping respectively by pipeline and valve, and the pressurized air pilot piping connects purification of compressed air;
Accompany in the hot case and install and measure the pond, deuterium lamp is installed in the front end of measuring cell, spectrometer is connected by optical fiber with the measuring cell rear end, measuring cell is cylindric, the lining of inner installation and its uniform internal diameter, the front end of measuring cell is installed flat mirror, convex lens are installed in the rear end, on the sidewall of the measuring cell of the front of flat mirror back and convex lens, be provided with input pipe and efferent duct, the input pipe of measuring cell connects filtrator and well heater successively by pipeline, and well heater connects the electric tracing pipe by pipeline, is connected with the probe gas outlet, well heater is by pipeline caliberating device in parallel, caliberating device comprises demarcation pipeline and the purification of compressed air pipeline that is connected in parallel, and on the demarcation pipeline flow is installed and is taken into account valve, connects calibrating gas, purification of compressed air pipeline mounted valve connects purification of compressed air; The efferent duct of measuring cell connects oxygen level sensor, pressure transducer and the Temperature Humidity Sensor that is arranged in parallel by pipeline, oxygen level sensor connect successively the installation gravity condenser that is arranged in parallel and peristaltic pump discharge pipe line, be provided with the exhaust pipe of diaphragm pump and be provided with the gas exhaust piping of valve, be connected with dust-collecting bucket respectively.
2. a kind of heat as claimed in claim 1 extraction method ultraviolet difference flue gas concentration monitor system that wets is characterized in that: the heating box temperature alarm is installed in the hot case of said companion.
3. a kind of heat as claimed in claim 1 extraction method ultraviolet difference flue gas concentration monitor system that wets is characterized in that: temperature controller is installed in the hot case of said companion is connected.
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| CN2011101484573A CN102252991A (en) | 2011-06-03 | 2011-06-03 | Ultraviolet differential flue gas concentration monitoring system through heat and moisture extraction process |
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| CN102749286A (en) * | 2012-07-31 | 2012-10-24 | 郭振铎 | Novel portable gas normal position monitor of flue gas and pipeline gas |
| CN102788764A (en) * | 2012-08-21 | 2012-11-21 | 南京埃森环境技术有限公司 | Ultraviolet analyzer and detection method for low concentration smoke |
| CN103808682A (en) * | 2012-11-14 | 2014-05-21 | 南京埃森环境技术有限公司 | Low-concentration flue gas ultraviolet analyzer based on Fourier transform and detection method thereof |
| CN103808685A (en) * | 2012-11-14 | 2014-05-21 | 南京埃森环境技术有限公司 | Low-concentration flue gas infrared analyzer based on Fourier transform and detection method thereof |
| CN103852433A (en) * | 2014-03-25 | 2014-06-11 | 南京霍普斯科技有限公司 | Online removable high-temperature heat wet process flue gas monitoring system |
| CN104748666A (en) * | 2013-12-30 | 2015-07-01 | 中核武汉核电运行技术股份有限公司 | Deep defect quantifying method based on eddy rotating probe signal |
| CN104748662A (en) * | 2013-12-30 | 2015-07-01 | 中核武汉核电运行技术股份有限公司 | Measuring method for scale deposit thickness on external wall of heat transferring pipe based on eddy current testing signals |
| CN104897534A (en) * | 2015-05-14 | 2015-09-09 | 苏州奥德克光电有限公司 | Wet flue gas on-line dust meter |
| CN105137500A (en) * | 2015-07-25 | 2015-12-09 | 皖江新兴产业技术发展中心 | Flue gas pretreatment device blocking monitoring device and method |
| CN106198388A (en) * | 2016-07-05 | 2016-12-07 | 安徽宏锦包装设备有限公司 | Infrared ray spectrometer preventer |
| CN106483088A (en) * | 2016-12-27 | 2017-03-08 | 东南大学 | A kind of gas concentration measuring apparatus based on ultraviolet light modulation and method |
| CN107153022A (en) * | 2017-07-06 | 2017-09-12 | 湖南千盟智能信息技术有限公司 | A kind of online coke oven flue gas analytical instrument pretreatment system |
| CN107328727A (en) * | 2017-07-27 | 2017-11-07 | 天津国阳科技发展有限公司 | Flue gas analysis device and method based on ultraviolet difference technology |
| CN108318437A (en) * | 2018-01-19 | 2018-07-24 | 中国科学院合肥物质科学研究院 | A kind of portable flue gas in-situ measurement system based on the adjustable how anti-pool technology of ultraviolet opening |
| CN112067747A (en) * | 2020-08-21 | 2020-12-11 | 内蒙古航天金岗重工有限公司 | Flue gas on-line monitoring system |
| CN112824875A (en) * | 2019-11-20 | 2021-05-21 | 杭州绰美科技有限公司 | Method for detecting ultraviolet differential nitrogen dioxide gas |
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2011
- 2011-06-03 CN CN2011101484573A patent/CN102252991A/en active Pending
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| CN102749286A (en) * | 2012-07-31 | 2012-10-24 | 郭振铎 | Novel portable gas normal position monitor of flue gas and pipeline gas |
| CN102749286B (en) * | 2012-07-31 | 2014-11-12 | 郭振铎 | Novel portable gas normal position monitor of flue gas and pipeline gas |
| CN102788764A (en) * | 2012-08-21 | 2012-11-21 | 南京埃森环境技术有限公司 | Ultraviolet analyzer and detection method for low concentration smoke |
| CN103808682A (en) * | 2012-11-14 | 2014-05-21 | 南京埃森环境技术有限公司 | Low-concentration flue gas ultraviolet analyzer based on Fourier transform and detection method thereof |
| CN103808685A (en) * | 2012-11-14 | 2014-05-21 | 南京埃森环境技术有限公司 | Low-concentration flue gas infrared analyzer based on Fourier transform and detection method thereof |
| CN104748666A (en) * | 2013-12-30 | 2015-07-01 | 中核武汉核电运行技术股份有限公司 | Deep defect quantifying method based on eddy rotating probe signal |
| CN104748662A (en) * | 2013-12-30 | 2015-07-01 | 中核武汉核电运行技术股份有限公司 | Measuring method for scale deposit thickness on external wall of heat transferring pipe based on eddy current testing signals |
| CN103852433A (en) * | 2014-03-25 | 2014-06-11 | 南京霍普斯科技有限公司 | Online removable high-temperature heat wet process flue gas monitoring system |
| CN104897534A (en) * | 2015-05-14 | 2015-09-09 | 苏州奥德克光电有限公司 | Wet flue gas on-line dust meter |
| CN105137500A (en) * | 2015-07-25 | 2015-12-09 | 皖江新兴产业技术发展中心 | Flue gas pretreatment device blocking monitoring device and method |
| CN106198388A (en) * | 2016-07-05 | 2016-12-07 | 安徽宏锦包装设备有限公司 | Infrared ray spectrometer preventer |
| CN106483088A (en) * | 2016-12-27 | 2017-03-08 | 东南大学 | A kind of gas concentration measuring apparatus based on ultraviolet light modulation and method |
| CN107153022A (en) * | 2017-07-06 | 2017-09-12 | 湖南千盟智能信息技术有限公司 | A kind of online coke oven flue gas analytical instrument pretreatment system |
| CN107328727A (en) * | 2017-07-27 | 2017-11-07 | 天津国阳科技发展有限公司 | Flue gas analysis device and method based on ultraviolet difference technology |
| CN107328727B (en) * | 2017-07-27 | 2019-10-22 | 天津国阳科技发展有限公司 | Flue gas analysis device and method based on ultraviolet difference technology |
| CN108318437A (en) * | 2018-01-19 | 2018-07-24 | 中国科学院合肥物质科学研究院 | A kind of portable flue gas in-situ measurement system based on the adjustable how anti-pool technology of ultraviolet opening |
| CN112824875A (en) * | 2019-11-20 | 2021-05-21 | 杭州绰美科技有限公司 | Method for detecting ultraviolet differential nitrogen dioxide gas |
| CN112067747A (en) * | 2020-08-21 | 2020-12-11 | 内蒙古航天金岗重工有限公司 | Flue gas on-line monitoring system |
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Application publication date: 20111123 |