CN100504351C - Method and system for monitoring continuous exhaust of smoke - Google Patents
Method and system for monitoring continuous exhaust of smoke Download PDFInfo
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- CN100504351C CN100504351C CNB2006100523103A CN200610052310A CN100504351C CN 100504351 C CN100504351 C CN 100504351C CN B2006100523103 A CNB2006100523103 A CN B2006100523103A CN 200610052310 A CN200610052310 A CN 200610052310A CN 100504351 C CN100504351 C CN 100504351C
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Abstract
The invention relates to a method for continuously detecting the smoke discharge, which comprises: a, the smoke of tube is sampled by the sampling detector; b, the sample smoke is fed into heater, to be preheated and fed into the heating measure pool; c, using spectrum analyze technique to measure the density of at least one tested gas or the material which is gas when heated but not gas in normal temperature in the pool. The invention also discloses a relative detecting system. The invention has low error, low cost, and high response speed.
Description
Technical field
The present invention relates to the continuous flue gas monitoring field, particularly a kind of fume emission continuous monitoring method and system thereof.
Background technology
Flue gas discharge continuous monitoring system is a kind of system that the smoke emissioning pollution source is monitored.A kind of existing flue gas discharge continuous monitoring system comprises heating sampler, heat tracing pipe, heating measuring cell and measurement mechanism.The heating sampler generally is installed in the middle part of tested chimney etc. or higher, and the position is higher.Flue gas in the tested chimney etc. is through after the sampling of heating sampler, filtering, lead to ground heating measuring cell through omnidistance heat tracing pipe, use measurement mechanism then and record each component of heating measurement pool gas such as the concentration of sulphuric dioxide, oxides of nitrogen, ammonia and hydrogen chloride etc.Described measurement mechanism adopts differential optical absorption spectrum technology, Fuli's leaf spectral analysis technique and Non-Dispersive Infra-red (NDIR) analytical technology to wait analytical gas concentration usually.Yet this type systematic also has following deficiency: 1) the Measuring Time delay is bigger, measures owing to need lead to the flue gas in the tested pipeline in the measuring cell by long heat tracing pipe, causes bigger time delay; Just need to use the aspiration pump of big flow and want to reduce time delay, but this scheme is accelerating also to have strengthened the load of pretreatment system in the response time, as cause that sampler is easily blocked, condenser duty becomes and is prone to fault greatly; 2) cost height, on the one hand, the unit price height of heat tracing pipe, and need to use long heat tracing pipe usually; On the other hand, sampler, heat tracing pipe and measuring cell all need independently attemperating unit; 3) measuring error is big, flue gas will be transferred to the heating measuring cell through long heat tracing pipe, but this long heat tracing pipe may exist the heating inequality to cause the not heated phenomenon in heat tracing pipe part, and distortion may take place the composition in this transmission course in the flue gas, causes to measure and is forbidden; 4) likelihood of failure increases, and the heating inequality that long heat tracing pipe may exist can cause that the pipeline under the low ambient temperature is icing to break; 5) installation and maintenance inconvenience need be led the analytic system on ground to long heat tracing pipe from tested chimney eminence.
Another flue gas discharge continuous monitoring system commonly used is an original position formula monitoring system, one measuring sonde is inserted in the tested pipeline, the light that the light emitting devices of monitoring system sends is installed in after the light reflecting device reflection of measuring sonde end again that the optical pickup apparatus of monitored system receives, and the analysis of received signal feed signals treating apparatus obtains each component concentrations in the tested flue gas.Although this system has avoided the use heat tracing pipe, but still there is following deficiency: 1) demarcate trouble, usually demarcate again after need from tested chimney, being shifted out the measuring sonde of the monitoring system that is installed in tested chimney eminence, because country and industry standard regulation need be carried out regular demarcation to flue gas discharge continuous monitoring system, this has brought big inconvenience to the user; 2) expansion of such monitoring system is relatively poor, and the measurement gas kind is subject to the optical measurement principle that monitoring system adopts, and can't measure carbon monoxide and carbon dioxide as the ultraviolet difference method, needs to increase new monitoring system this moment and analyzes these gaseous species; 3) measuring accuracy is low, and measuring sonde need be inserted in the tested pipeline, and test environment is often very abominable, the temperature height, and dust is many, and airflow fluctuation is big etc., and these factors have reduced the accuracy of measuring; 4) maintenance workload is big, because measuring sonde need be inserted in the tested pipeline, measuring sonde is easily corroded by some corrosive gass, and dust, the tar in the gas also can pollute light reflecting device simultaneously, needs the cleaned at regular intervals optical element, has strengthened maintenance workload.
Summary of the invention
The technical matters of the present invention's solution is to overcome above-mentioned defective, and a kind of cost is low, measuring error is little, reliability is high, the measurement response is fast, demarcation is easy, maintainability is good fume emission continuous monitoring method and system thereof are provided.
The objective of the invention is to be achieved by following technical proposals:
A kind of fume emission continuous monitoring method, concrete steps are: the flue gas in a. pipeline is taken a sample by sampling probe; B. the flue gas after the sampling is directly sent in the heating arrangement, and flue gas is handled through pretreatment unit earlier in heating arrangement, feeds in the measuring cell afterwards; C. to use spectral analysis technique to measure in the measuring cell under at least a tested gas or the normality be on-gaseous but be the simple substance or the compound concentrations of gaseous state in measuring cell.
Described pretreatment unit and measuring cell are to be heated together or independent separately heating.
Described spectral analysis technique is a differential optical absorption spectrum technology.
Further, also measure oxygen concentration or moisture concentration or temperature or pressure in the described measuring cell among the described step c.
Described monitoring method comprises the steps: that also d. removes the moisture from the gaseous component that described measuring cell is discharged; E. measure the concentration of at least a tested gas in the back gaseous component that dewaters at last.
A kind of flue gas discharge continuous monitoring system, comprise the sampling probe and first measurement mechanism, described monitoring system also is provided with a heating arrangement, described sampling probe directly is connected with heating arrangement, pretreatment unit and measuring cell are installed in the described heating arrangement, and described pretreatment unit is connected with measuring cell and all is heated; The light that first measurement mechanism sends passes described measuring cell, and then to measure in the described measuring cell under at least a tested gas or the normality be on-gaseous but be the simple substance or the compound concentrations of gaseous state in measuring cell.
Described pretreatment unit and measuring cell are to be heated together or independent separately heating.
Described first measurement mechanism comprises differential optical absorption spectroanalysis device.
Described monitoring system also comprises the de-watering apparatus and second measurement mechanism; The de-watering apparatus that is used for removing the gaseous component moisture of discharging from described measuring cell is connected with described measuring cell, and second measurement mechanism of concentration that is used for measuring at least a tested gas of the gaseous component after de-watering apparatus dewaters is installed in the gas circuit in described de-watering apparatus downstream.
Described second measurement mechanism comprises absorption spectrum or Raman spectrum or fluorescence spectrum or galvanochemistry or paramagnetic analytical equipment.
Described first measurement mechanism also comprises oxygen sensor or humidity sensor or pressure transducer or temperature sensor, and described second measurement mechanism comprises oxygen sensor or temperature sensor or pressure transducer.
Compared with prior art, advantage of the present invention is: 1) system cost is low, has saved expensive heat tracing pipe and a plurality of attemperating unit, has reduced cost; 2) precision height, owing to be that the flue gas in the tested pipeline directly is transferred to measuring cell after taking a sample, gaseous component and the composition in the pipeline in the measuring cell are very approaching, simultaneously, tested gas was handled through pretreatment unit, did not have particles such as dust; 3) response speed is fast, has saved heat tracing pipe, has reduced measurement time delay; 4) expansibility is good, can more easily expand other measurement mechanisms, can analyze more gas componants by other measurement mechanisms of expansion after tested flue gas is discharged in the measuring cell; 5) demarcate easily, the gas bottle is connected to the front or the back of measuring cell, can realize automatically, regularly monitoring system be carried out original position and demarcate by the software design in the measurement mechanism; 6) reliability height, maintenance workload is little, has saved the heat tracing pipe that is prone to fault, does not also need often to clean optical element, can use the sample gas than low discharge simultaneously, and sampling and pretreatment unit load are little.
Description of drawings
Fig. 1 is the structural representation of a kind of flue gas discharge continuous monitoring system of the present invention;
Fig. 2 is the structural representation of second kind of flue gas discharge continuous monitoring system of the present invention;
Fig. 3 is the structural representation of first measurement mechanism;
Fig. 4 is the structural representation of second measurement mechanism;
Fig. 5 is a kind of fume emission continuous monitoring method synoptic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
First embodiment:
As Fig. 1, shown in Figure 3, a kind of flue gas discharge continuous monitoring system comprises sampling probe 2, heating arrangement 6, first measurement mechanism, aspiration pump 8, gas bottle 17 and valve 4,15,16.Described sampling probe 2 is installed on the tested pipeline 1 and with heating arrangement 6 and is connected.Pretreatment unit 3 is installed as filtrator, valve 4 and measuring cell 5 in the heating arrangement 6, pretreatment unit 3 connects valve 4, measuring cell 5 successively.The outer rim of heating arrangement 6 is equipped with the electric boiling plate (not shown), and pretreatment unit 3 and measuring cell 5 are heated together like this, thereby makes gaseous state composition and the composition in the tested pipeline 1 in the measuring cell 5 very approaching.Described valve 15 is installed on the tracheae behind the pretreatment unit 3, and valve 16 and gas bottle 17 are installed on the gas circuit in measuring cell 5 downstreams.
Described first measurement mechanism comprises that being installed in one in the instrument cabinet overlaps ultraviolet difference optical absorption spectra analytical equipment 7 and first oxygen sensor, humidity sensor, temperature sensor and the pressure transducer (all not shown) that are installed on the measuring cell 5.Described analytical equipment 7 comprises light source 70, optical fiber 71,72, optical pickup apparatus 73 and signal processor 74, the working method of described analytical equipment 7 is as follows: the light that ultraviolet source 70 sends as xenon lamp is connected to an end of measuring cell 5 by optical fiber 71, be connected with optical pickup apparatus 73 by another optical fiber 72 again after passing the gaseous component in the measuring cell 5, described optical pickup apparatus 73 comprises light-splitting device and photoelectric commutator, the light that this optical pickup apparatus 73 receives is by light-splitting device such as grating beam splitting, be converted to electric signal and feed signals processor 74 by photoelectric commutator afterwards and analyze and consider temperature and pressure in the measuring cell 5, thereby analyze the concentration that obtains at least a gaseous material in the measuring cell 5.Described gaseous material comprises under gas, the normality to be on-gaseous but to be the simple substance or the compound of gaseous state in measuring cell.This first measurement mechanism can measure easily molten exactly and gas that can be water-soluble and normality under be on-gaseous but be the simple substance or the compound concentrations of gaseous state in measuring cell.After aspiration pump 8 is installed in measuring cell 5, be used to extract out the flue gas in the tested pipeline 1.Certainly, also can substitute described aspiration pump 8 with fluidic device.Tested flue gas leads to back in the tested pipeline 1 at last.
Present embodiment also discloses a kind of fume emission continuous monitoring method, also is the course of work of above-mentioned flue gas discharge continuous monitoring system, and concrete steps are: the flue gas in a. tested pipeline 1 is by sampling probe 2 samplings; B. tested flue gas is passed into heating arrangement 6, and pretreatment unit 3, valve 4 and measuring cell 5 in the heating arrangement 6 are heated together as 150 ℃, and flue gas is filtered by the pretreatment unit 3 of heating earlier in heating arrangement 6, leads in the measuring cell 5 by valve 4 afterwards.C. described temperature and pressure sensor records the temperature and pressure in the measuring cell 5 this moment; Analytical equipment 7 in the instrument cabinet is measured the concentration of at least a gaseous material in the measuring cell 5, as some gases soluble in water such as ammonia, sulphuric dioxide, hydrogen chloride, hydrogen fluoride, with be on-gaseous under oxides of nitrogen such as nitrogen monoxide, nitrogen dioxide and the normality but be the concentration of simple substance such as mercury and the compound such as the carbon disulphide of gaseous state in measuring cell; The lambda sensor and the humidity sensor measurement that are installed on the measuring cell go out oxygen concentration and moisture concentration in the flue gas; Flue gas is discharged the back from measuring cell 5 and is sent back in the tested pipeline 1.
After described monitoring system is used a period of time, sampling probe 2 and pretreatment unit 3 may be blocked, at this moment valve-off 4 and aspiration pump 8, open valve 15 and blowback sampling probe 2 and pretreatment unit 3, the foreign material such as dirt of deposition in sampling probe 2 and the pretreatment unit 3 are blown in the tested pipeline 1, make monitoring system be able to operate as normal.
When described monitoring system needs timing signal, monitoring system is closed aspiration pump 8 automatically, opens valve 16, and the gases in the gas bottle 17 are led in the measuring cell 5, thereby realizes the demarcation to first measurement mechanism, and gas flows in the tested pipeline 1 at last.
Second embodiment:
As Fig. 2, shown in Figure 4, a kind of flue gas discharge continuous monitoring system, different with first embodiment is: on the described measuring cell 5 humidity sensor and pressure transducer are installed no longer.The outer rim of heating arrangement 6 is no longer installed heating plate, but in the outer rim of pretreatment unit 3 and measuring cell 5 the heating member (not shown) is installed respectively, thereby can make pretreatment unit 3 and measuring cell 5 keep different temperatures.Tested flue gas leads to measuring cell 5 through tracheae after pretreatment unit 3 is discharged as filtrator, the part of described tracheae is exposed to heating arrangement 6 outsides, and on the expose portion of tracheae mounted valve 4.Described monitoring system also comprises de-watering apparatus, second measurement mechanism, and measuring cell 5 connects described de-watering apparatus such as cooling device 9 by tracheae, water pot 10, displacement can 11 and filtrator 12, and wherein cooling device 9 is connected with filtrator 12; The gas of discharging from filtrator 12 is connected to the instrument cabinet by tracheae.
Described second measurement mechanism comprises that a cover is installed in the semi-conductor laser absorption spectrum analytical equipment 14 in the instrument cabinet, and analytical equipment 14 comprises light source 140, photoelectric commutator 141, signal processor 142 and gas compartment 143; The working method of described analytical equipment 14 is as follows: the light that light source 140 sends as laser instrument passes the tested gas in the gas compartment 143, received and be converted to electric signal by photoelectric commutator 141 afterwards, then electric signal feed signals processor 142 is analyzed, thus the concentration of gas in the gaseous component after obtaining dewatering.Second measurement mechanism also comprises the second oxygen sensor (not shown) and pressure transducer 13; The second oxygen sensor (not shown) is installed on the tracheae in the instrument cabinet, and described pressure transducer 13 is connected with described cooling device 9.Aspiration pump 8 is installed on the gas circuit between described filtrator 12 and the analytical equipment 14, is used to extract out the flue gas in the pipeline 1.Flue gas can feed in the tested pipeline 1 or other analytical equipments after instrument cabinet is discharged again.
See also Fig. 5, present embodiment has also disclosed a kind of fume emission continuous monitoring method, also is the course of work of above-mentioned flue gas discharge continuous monitoring system, and concrete steps are: the flue gas in a. tested pipeline 1 is by sampling probe 2 samplings; B. flue gas is passed into heating arrangement 6 after, and pretreatment unit 3 in the heating arrangement 6 and measuring cell 5 be separately by independent heating, such as, the pretreatment unit temperature is 200 ℃, the measuring cell temperature is 150 ℃; Flue gas is filtered by the pretreatment unit 3 of heating earlier in heating arrangement 6, leads in the measuring cell 5 by valve 4 afterwards.C. the temperature sensors in the measuring cell 5 record the temperature in the measuring cell 5 this moment; Analytical equipment 7 in the instrument cabinet is measured in the measuring cell 5 under at least a tested gases or the normality to be on-gaseous but to be the simple substance or the compound concentrations of gaseous state in measuring cell 5.Specific to present embodiment, described tested gas can comprise gas soluble in water such as ammonia, sulphuric dioxide, hydrogen chloride, hydrogen fluoride and oxides of nitrogen such as nitrogen monoxide, nitrogen dioxide, described gaseous elemental such as mercury, described gaseous compound such as carbon disulphide; First oxygen sensor in the measuring cell 5 records the content of oxygen in flue gas this moment simultaneously; D. afterwards by de-watering apparatus such as cooling device 9, the moisture from the flue gas that measuring cell 5 is discharged is removed in water pot 10, displacement can 11 condensations, also having removed some gases soluble in water such as ammonia, sulphuric dioxide, hydrogen chloride, hydrogen fluoride etc. in the condensation removal process, is that the simple substance and the compound of on-gaseous also is cooled to liquid/solid under those normalities.Pressure transducer 13 records the pressure of flue gas in the cooling device 9, and the pressure in this pressure and the measuring cell much at one; Flue gas is discharged the back from cooling device 9 and is filtered out the liquid/solid particle by filtrator 12; Lead in the instrument cabinet by tracheae afterwards.E. second oxygen sensor on the tracheae in the instrument cabinet records the oxygen content in the back gas that dewaters; Described analytical equipment 14 in the last instrument cabinet is measured the concentration of some gas compositions such as carbon monoxide etc. in the gaseous component after dewatering.
When foreign material such as deposition dirt in the sampling probe 2 of described monitoring system and the pretreatment unit 3, need timing signal, corresponding processing mode is identical with first embodiment.
According to national standard, one is enclosed within the content that the flue gas discharge continuous monitoring system of measuring smoke components under the heating condition also will be measured water in the heating flue gas, here can calculate the content of water in the flue gas by the reading of first oxygen sensor in the measuring cell 5 and second oxygen sensor on the tracheae in the instrument cabinet, simple and fast.
It is pointed out that the foregoing description should not be construed as limiting the scope of the invention.Such as in the above-described embodiments, described analytical equipment 7 is connected with measuring cell by optical fiber, can also be installed in first measurement mechanism one or both sides of measuring cell certainly, thereby the light that described analytical equipment 7 is sent passes the tested composition in the measuring cell.Under the situation that does not break away from spirit of the present invention, any type of change that the present invention is made all should fall within protection scope of the present invention.
Claims (11)
1, a kind of fume emission continuous monitoring method, concrete steps are: the flue gas in a. pipeline is taken a sample by sampling probe; B. the flue gas after the sampling is directly sent in the heating arrangement, and flue gas is handled through pretreatment unit earlier in heating arrangement, feeds in the measuring cell afterwards; C. to use spectral analysis technique to measure in the measuring cell under at least a tested gas or the normality be on-gaseous but be the simple substance or the compound concentrations of gaseous state in measuring cell.
2, monitoring method according to claim 1 is characterized in that: described pretreatment unit and measuring cell are to be heated together or independent separately heating.
3, monitoring method according to claim 1 is characterized in that: described spectral analysis technique is a differential optical absorption spectroanalysis technology.
4, monitoring method according to claim 1 is characterized in that: also measure oxygen concentration or moisture concentration or temperature or pressure in the described measuring cell among the described step c.
5, according to each described monitoring method of claim 1 to 4, it is characterized in that: comprise the steps that also d. removes the moisture from the gaseous component that described measuring cell is discharged; E. measure the concentration of at least a tested gas in the back gaseous component that dewaters at last.
6, a kind of flue gas discharge continuous monitoring system, comprise the sampling probe and first measurement mechanism, it is characterized in that: described flue gas discharge continuous monitoring system also is provided with a heating arrangement, described sampling probe directly is connected with heating arrangement, pretreatment unit and measuring cell are installed in the described heating arrangement, and described pretreatment unit is connected with measuring cell and all is heated; The light that first measurement mechanism sends passes described measuring cell, and then to measure in the described measuring cell under at least a tested gas or the normality be on-gaseous but be the simple substance or the compound concentrations of gaseous state in measuring cell.
7, monitoring system according to claim 6 is characterized in that: described pretreatment unit and measuring cell are to be heated together or independent separately heating.
8, monitoring system according to claim 6 is characterized in that: described first measurement mechanism comprises differential optical absorption spectroanalysis device.
9, monitoring system according to claim 6 is characterized in that: described monitoring system also comprises the de-watering apparatus and second measurement mechanism; The de-watering apparatus that is used for removing the moisture of the gaseous component of discharging from described measuring cell is connected with described measuring cell; Second measurement mechanism that is used for measuring the concentration of at least a tested gas of gaseous component after de-watering apparatus dewaters is installed in the gas circuit in described de-watering apparatus downstream.
10, monitoring system according to claim 9 is characterized in that: described second measurement mechanism comprises absorption spectrum or Raman spectrum or fluorescence spectrum or galvanochemistry or paramagnetic analytical equipment.
11, monitoring system according to claim 9, it is characterized in that: described first measurement mechanism also comprises oxygen sensor or humidity sensor or pressure transducer or temperature sensor, and described second measurement mechanism also comprises oxygen sensor or temperature sensor or pressure transducer.
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| CNB2006100523103A CN100504351C (en) | 2006-07-04 | 2006-07-04 | Method and system for monitoring continuous exhaust of smoke |
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| CNB2006100523103A CN100504351C (en) | 2006-07-04 | 2006-07-04 | Method and system for monitoring continuous exhaust of smoke |
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| CN100504351C true CN100504351C (en) | 2009-06-24 |
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| CN102087179B (en) * | 2011-01-20 | 2012-11-14 | 北京雪迪龙科技股份有限公司 | Infrared gas analysis pretreatment system |
| CN102749318A (en) * | 2012-07-19 | 2012-10-24 | 北京雪迪龙科技股份有限公司 | Device and method for detecting formaldehyde |
| CN103344590B (en) * | 2013-06-28 | 2015-07-08 | 聚光科技(杭州)股份有限公司 | Flue gas denitrification monitoring system and method |
| CN103399057A (en) * | 2013-08-16 | 2013-11-20 | 北京雪迪龙科技股份有限公司 | Flue gas treatment system and dry-wet oxygen measurement apparatus 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 |
| CN105510265B (en) * | 2014-09-26 | 2018-09-18 | 株式会社岛津制作所 | Infrared ray gas analyzer and analysis method for gases |
| CN105092510B (en) * | 2015-08-03 | 2018-08-31 | 浙江大唐国际绍兴江滨热电有限责任公司 | A kind of Natural Gas Power Plant flue gas on-line continuous monitoring method and system |
| CN105067553A (en) * | 2015-08-14 | 2015-11-18 | 安徽蓝盾光电子股份有限公司 | Heat tracing tank based high-precision FTIR (Fourier transform infrared spectroscopy) online measurement system for flue gas |
| CN105388258A (en) * | 2015-12-21 | 2016-03-09 | 中国神华能源股份有限公司 | Gas pipeline wind leakage apparatus and oxygen-rich combustion system |
| CN106248639A (en) * | 2016-06-20 | 2016-12-21 | 环境保护部华南环境科学研究所 | Multichannel nitrogen oxides on-line monitoring system based on laser-induced fluorescence (LIF) |
| CN105911118A (en) * | 2016-06-30 | 2016-08-31 | 重庆川然节能技术有限公司 | Intelligent detection system and method for smoke components |
| 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 |
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