CN103344590B - Flue gas denitrification monitoring system and method - Google Patents
Flue gas denitrification monitoring system and method Download PDFInfo
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Abstract
The invention provides a flue gas denitrification monitoring system which comprises a sampling device, a filter device, a gas chamber, an analysis meter, an isolation device, a heater and a cleaning plant, wherein the isolation device is used for supplying gas; the gas enters the gas chamber via a gas inlet, forms an isolation region on one side of an optical component adjacent to the flue gas, and is discharged out of the gas chamber via a gas outlet; the heater is used for heating the filter device, the gas chamber and a pipeline connecting the filter device and gas chamber; the cleaning plant comprises a main body, and a first channel, a second channel and a third channel which are arranged in the main body and communicated with each other; the first channel is communicated with the filter device, the second channel is communicated with the gas chamber, and the third channel is communicated with a gas source; the first channel is provided with an expansion region; the included angle between the first channel and the second channel is an obtuse angle or right angle; and the included angle between the second channel and third channel is an acute angle or right angle. The invention has the advantages of high detection speed, high precision, long continuous working time and the like.
Description
Technical field
The present invention relates to gas-monitoring, particularly denitrating flue gas monitoring system and method.
Background technology
In flue gas SCR (or SNCR) technique denitration technology, utilize ammonia and oxides of nitrogen to react, generate water and nitrogen, thus meet the requirement of environmental protection.In order to control the amount spraying into raw material ammonia, prevent too much ammonia and sample solid/liquid/gas reactions from generating solid matter and blocking air preheater or the optical window of rear end, need to monitor the escape ammonia in denitration outlet flue, form the ammonia spraying amount of closed-loop control denitrification apparatus.
In the monitoring of above-mentioned denitrating flue gas escape ammonia, operating mode is comparatively severe:
1, in flue gas, dust content is very large, reaches 30-50mg/m
3.In detection for sampling pretreatment mode, high dust is easy to blocking probe, goes back severe contamination analysis meter, measuring cell.
2, in flue gas, water cut is high, if detect ammonia by traditional analysis instrument, detection can be subject to the interference of water, and accuracy of detection is low.
3, in order to available protecting probe, need the low blowback probe in interval, therefore valve is set between probe and gas compartment, and blowback source of the gas is set between valve and probe.Because described valve must be operated in high temperature occasion (flue gas in pipeline needs companion's heat), therefore adopt high temp .-resistant valve.This kind of valve is expensive, and inner moving component also brings maintenance and life problems.
Based on above-mentioned bad working environments; someone proposes the precision of raising smoke filtration to reduce the dust content in flue gas; so effectively protect analysis meter, measuring cell; but substantially increase the maintenance that (extremely susceptible to plugging) filters probe; reduce the serviceable life of filtering probe; reduce the time of monitoring continuously simultaneously, have a strong impact on the closed-loop control of denitrating technique.Further, the ammonia level that analysis meter detects is compared with the content in environment, always on the low side, but can not find reason all the time.
For these reasons, prior art be cannot meet fast, the demand of flue gas under high precision, continuous print monitoring denitration environment, environment protection standard requirement cannot be reached.Therefore, to realize in denitration field continuously, high precision, fast monitored flue gas be a technical barrier in the urgent need to address.
Summary of the invention
In order to solve the deficiency in above-mentioned prior art, the invention provides a kind of denitrating flue gas monitoring system, to solve in denitrating flue gas field the technical barriers such as high dust, high-moisture, metrical error be large, thus achieve in denitration field low cost, continuously, monitor the goal of the invention of composition in flue gas fast and in high precision.
The object of the invention is to be achieved through the following technical solutions:
A kind of denitrating flue gas monitoring system, described denitrating flue gas monitoring system comprises sampler, filtration unit, gas compartment and analysis meter; Described denitrating flue gas monitoring system comprises further:
Spacer assembly, described spacer assembly is used for providing gas, and this gas enters in described gas compartment from air intake opening, forms isolated area in the side of the contiguous flue gas of optics, after from exhausr port Exhaust Gas room;
Heating arrangement, described heating arrangement is for heating the pipeline of described filtration unit, gas compartment, connection filtration unit and gas compartment;
Cleaning plant, the third channel that described cleaning plant comprises body, is arranged on the first passage of the described filtration unit of the intrinsic connection be interconnected, is communicated with the second channel of described gas compartment and connection source of the gas, first passage arranges breathing space, angle between described first passage and second channel is obtuse angle or right angle, and the angle between described second channel and third channel is acute angle or right angle.
According to above-mentioned denitrating flue gas monitoring system, preferably, the filtering accuracy of described filtration unit is 5-20 μm.
According to above-mentioned denitrating flue gas monitoring system, preferably, described sampler for extracting the flue gas in test environment out, and makes flue gas flow exceed 10L/min in stream.
According to above-mentioned denitrating flue gas monitoring system, preferably, flue gas flows exceed 20L/min in stream.
According to above-mentioned denitrating flue gas monitoring system, preferably, the temperature of described filtration unit, pipeline and gas compartment is more than 200 DEG C.
According to above-mentioned denitrating flue gas monitoring system, preferably, the both sides of described gas compartment arrange optical window, and at least 2 air intake openings are separately positioned on the side that described optical window closes on flue gas.
According to above-mentioned denitrating flue gas monitoring system, preferably, described flue gas enters described gas compartment between described air intake opening.
According to above-mentioned denitrating flue gas monitoring system, preferably, described exhausr port is arranged on the gas compartment between described air intake opening.
According to above-mentioned denitrating flue gas monitoring system, preferably, described analysis meter is laser spectral analysis instrument.
Present invention also offers a kind of denitrating flue gas monitoring method, to solve in denitrating flue gas field the technical barriers such as high dust, high-moisture, metrical error be large, thus to achieve in denitration field continuously, monitor fast and in high precision the goal of the invention of composition in flue gas.This goal of the invention is achieved through the following technical solutions:
The method of work of any one denitrating flue gas monitoring system above-mentioned, described method of work comprises the following steps:
(A1) close described source of the gas, the flue gas in environment to be measured is transferred to gas compartment by first passage, second channel after sampling, filtration; In this sampling, filtration and transmitting procedure, flue gas is heated;
(A2) gas enters described gas compartment from air intake opening, forms isolated area, keep apart optics and flue gas, afterwards from exhausr port Exhaust Gas room in the side of the contiguous flue gas of optics; Analysis meter detects the content of flue gas in described gas compartment; Flue gas in gas compartment described in testing process is heated;
(A3) described source of the gas is opened, close sampler, the gas that source of the gas provides enters into breathing space in first passage from third channel and expands, thus the flue gas of gas compartment is drawn into first passage by second channel, and combination gas enters and clears up described filtration unit.
Compared with prior art, the beneficial effect that the present invention has is:
1, cleaning plant structure is simple, cost is low, high temperature resistant, there is no moving component, good reliability; Instead of original high temperature valve admirably;
2, gas barrier technology is creatively proposed, keep apart optics and flue gas, at utmost avoid the dust pollution optics in flue gas, improve the tolerance of gas compartment to dust, even the more dust in large discharge flue gas, so arrange the lower filtration unit of precision, reduce the maintenance of filtrator, improve serviceable life, improve the stream time of system simultaneously;
3, flue gas was heated to more than 200 DEG C before Exhaust Gas room always, made the water tariff collection gaseous state in flue gas, reduced moisture to the impact detected, correspondingly improve accuracy of detection.The Selective absorber spectral line that laser spectral analysis technology adopts ideally gets rid of again the interference of water;
4, have selected suitable flue gas flow, make follow-up testing result and truth deviation very little, lower than 1%, greatly reduce metrical error.
Accompanying drawing explanation
With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art it is easily understood that: these accompanying drawings only for illustrating technical scheme of the present invention, and and are not intended to be construed as limiting protection scope of the present invention.In figure:
Fig. 1 is the structure diagram of the denitrating flue gas monitoring system according to the embodiment of the present invention 1;
Fig. 2 is the process flow diagram of the denitrating flue gas monitoring method according to the embodiment of the present invention 1.
Embodiment
Fig. 1,2 and following description describe Alternate embodiments of the present invention and how to implement to instruct those skilled in the art and to reproduce the present invention.In order to instruct technical solution of the present invention, simplifying or having eliminated some conventional aspects.Those skilled in the art should understand that the modification that is derived from these embodiments or replace will within the scope of the invention.Those skilled in the art should understand that following characteristics can combine to form multiple modification of the present invention in every way.Thus, the present invention is not limited to following Alternate embodiments, and only by claim and their equivalents.
Embodiment 1:
Fig. 1 schematically illustrates the structure diagram of the denitrating flue gas monitoring system of the embodiment of the present invention, and as shown in Figure 1, described denitrating flue gas monitoring system comprises:
Sampler, filtration unit 2, gas compartment and analysis meter, these parts are all the state of the art, do not repeat them here.Sampler is arranged on flue 1.
Heating arrangement, described heating arrangement is for heating the pipeline of described filtration unit, gas compartment, connection filtration unit and gas compartment; Preferably, make flue-gas temperature in filtration unit 2, pipeline 3 and gas compartment more than 200 DEG C by heating.
Spacer assembly, described spacer assembly is used for providing gas, this gas enters in described gas compartment from air intake opening 61, isolated area is formed in the side of the contiguous flue gas of optics, keep apart optics and flue gas, at utmost avoid the dust pollution optics in flue gas, improve the tolerance of gas compartment to dust, gas is from exhausr port Exhaust Gas room.
Cleaning plant 7, the third channel that described cleaning plant comprises body, is arranged on the first passage of the described filtration unit of the intrinsic connection be interconnected, is communicated with the second channel of described gas compartment and connection source of the gas, first passage arranges breathing space, angle between described first passage and second channel is obtuse angle or right angle, and the angle between described second channel and third channel is acute angle or right angle.
By arranging spacer assembly on gas compartment, making to improve the tolerance of gas compartment to dust when not reducing detectability, reducing the requirement to filtration unit, alternatively, the filtering accuracy of described filtration unit is 5-20 μm.
In order to improve the precision of subsequent detection, preferably, described sampler for extracting the flue gas in test environment out, and makes flue gas flow exceed 10L/min in stream.
In order to improve the precision of subsequent detection further, preferably, flue gas flows exceed 20L/min in described stream.
In order to improve the tolerance of gas compartment to dust, reduce dust to the impact of measuring, preferably, the both sides of described gas compartment arrange optical window, and at least 2 air intake openings 61,62 are separately positioned on the side that described optical window closes on flue gas.
According to above-mentioned denitrating flue gas monitoring system, preferably, described flue gas enters described gas compartment from the gas approach 60 between described air intake opening.
According to above-mentioned denitrating flue gas monitoring system, preferably, described exhausr port 63,64 is arranged on the gas compartment between described air intake opening.
According to above-mentioned denitrating flue gas monitoring system, preferably, described exhausr port is at least 2, is separately positioned on described air intake opening and flue gas enters between gas compartment position.
In order to reduce in flue gas, moisture is to the adverse effect measured, and preferably, the temperature of described filtration unit, pipeline and gas compartment is more than 200 DEG C.
In order to improve gas detect accuracy, shorten detection time, get rid of the interference of other gas, preferably, described analysis meter is laser spectral analysis instrument, specifically comprises laser instrument 4, detector 5 and analysis module.
Fig. 2 schematically illustrates the process flow diagram of the method for work of any one above-mentioned denitrating flue gas monitoring system, and as shown in Figure 2, described method of work comprises the following steps:
(A1) close described source of the gas, the flue gas in environment to be measured is transferred to gas compartment by first passage, second channel after sampling, filtration; In this sampling, filtration and transmitting procedure, flue gas is heated;
(A2) gas enters described gas compartment from air intake opening, forms isolated area, keep apart optics and flue gas, afterwards from exhausr port Exhaust Gas room in the side of the contiguous flue gas of optics; Analysis meter detects the content of flue gas in described gas compartment; Flue gas in gas compartment described in testing process is heated;
(A3) described source of the gas is opened, close sampler, the gas that source of the gas provides enters into breathing space in first passage from third channel and expands, thus the flue gas of gas compartment is drawn into first passage by second channel, and combination gas enters and oppositely clears up described filtration unit.
Be according to the benefit that denitrating flue gas monitoring system and the method for the present embodiment 1 reach: gas forms isolated area in an example of the contiguous flue gas of optics, farthest avoid the dust pollution optics in flue gas, improve the tolerance of gas compartment to dust, so arrange the filtrator that precision is lower, reduce the maintenance of filtrator, improve serviceable life, improve the stream time of system simultaneously.Flue gas was heated to more than 200 DEG C before Exhaust Gas room always, made the water tariff collection gaseous state in flue gas, reduced moisture to the impact detected, correspondingly improve accuracy of detection.The Selective absorber spectral line that laser spectral analysis technology adopts ideally gets rid of again the interference of water.The suitable of flue gas makes follow-up testing result and truth deviation very, little, greatly reduces metrical error.
Embodiment 2:
According to denitrating flue gas monitoring system and the application examples of method in escape ammonia monitoring of the embodiment of the present invention 1.
In the denitrating flue gas monitoring system of this application examples, filtration unit adopts porcelain filter, and filtering accuracy is 20 μm; Electrical heating block is set in the case of filtration unit, pipeline arranges electric-heating belt, gas compartment adopt stainless steel make cylinder, be arranged on there is electrical heating block case in.The two ends of gas compartment arrange optics window, catoptron respectively, the gas compartment of the side of described optics window, the contiguous flue gas of catoptron arranges the air intake opening for passing into isolation gas, on gas compartment between two air intake openings, (centre as the gas compartment with air intake opening the same side) arranges gas approach, two exhausr ports are separately positioned on the gas compartment between gas approach and air intake opening, closer to air intake opening, and be in the both sides of gas compartment respectively with air intake opening (and gas approach).Analysis meter adopts laser gas analyzer, laser emission wavelength corresponds to the absorption line of the ammonia of the interference such as gas of getting rid of water, laser instrument, detector are arranged on the same side of gas compartment and are in the outside of described case, and analysis module is also in outside case, avoids the impact of being heated.By the heating of heating arrangement, make flue-gas temperature in filtration unit, pipeline and gas compartment more than 200 DEG C, as 250 DEG C, 280 DEG C etc.Gas and the source of the gas of isolation all adopt pressurized air.Be right angle between first passage and second channel, the angle between second channel and third channel is 30 degree.
Denitrating flue gas monitoring method is specially:
Close source of the gas, the flue gas in flue, through sampling probe, filtration, is transferred to gas compartment by pipeline afterwards; By the heating of heating arrangement, make flue-gas temperature in filtration unit, pipeline and gas compartment more than 200 DEG C, as 250 DEG C, 280 DEG C etc.; The flow of flue gas in stream is 10L/min;
Pressurized air enters in gas compartment from air intake opening, air insulated district is formed respectively in the side of optics window and the contiguous flue gas of catoptron, keep apart flue gas and optics window (and catoptron), prevent dust pollution optics window, catoptron in flue gas, together discharge from exhausr port with the flue gas of gas indoor afterwards; The measurement light corresponding to ammonia absorbing wavelength that laser instrument sends through optics window laggard enter in gas compartment, pass for being reflected by catoptron after air, flue gas, air, afterwards again through the air of catoptron side air, flue gas, diaphragm side, receive through being detected device after described optics window afterwards, signal send analysis module, and analysis module draws the content of ammonia in flue gas gas according to DLAS technology;
After monitoring system runs a period of time, close sampler, open source of the gas, the breathing space that pressurized air enters in first passage from third channel expands, and then the flue gas in gas compartment and the pressurized air that enters are drawn into first passage, mixed gas flows in filtrator at a high speed, thus serves reverse cleaning effect, finally enters in flue.
Embodiment 3:
According to denitrating flue gas monitoring system and the application examples of method in escape ammonia monitoring of the embodiment of the present invention 1.
In the denitrating flue gas monitoring system of this application examples, filtration unit adopts silk floss filtrator, and filtering accuracy is 8 μ n; Electrical heating block is set in filtration unit, pipeline arranges electric-heating belt, gas compartment adopt stainless steel make cylinder, be arranged on there is electrical heating block case in.The two ends of gas compartment arrange the first optics window, the second optical window respectively, the gas compartment of the side of described first optics window, the contiguous flue gas of the second optics window arranges the air intake opening for passing into isolation gas, on gas compartment between two air intake openings, (centre as the gas compartment with air intake opening the same side) arranges gas approach, two exhausr ports are separately positioned on the gas compartment between gas approach and air intake opening, closer to air intake opening, and be in the both sides of gas compartment respectively with air intake opening (and gas approach).Analysis meter adopts laser gas analyzer, laser emission wavelength corresponds to the absorption line of the ammonia of the interference such as gas of getting rid of water, laser instrument, detector are separately positioned on the both sides of gas compartment and are in the outside of described case, and analysis module is also in outside case, avoids the impact of being heated.By the heating of heating arrangement, make flue-gas temperature in filtration unit, pipeline and gas compartment more than 200 DEG C, as 220 DEG C, 260 DEG C etc.The gas of isolation adopts compressed nitrogen, and source of the gas adopts pressurized air.Be 150 degree between first passage and second channel, the angle between second channel and third channel is 45 degree.
Denitrating flue gas monitoring method is specially:
Close anger about trifles source, the flue gas in flue, through sampling probe, filtration, is transferred to gas compartment by pipeline afterwards; By the heating of heating arrangement, make flue-gas temperature in filtration unit, pipeline and gas compartment more than 200 DEG C, as 220 DEG C, 260 DEG C etc.; The flow of flue gas in stream is 22L/min;
Compressed nitrogen enters in gas compartment from air intake opening, nitrogen isolated area is formed respectively in the side of the first optics window and the contiguous flue gas of the second optics window, keep apart flue gas and optics window, prevent dust pollution optics window in flue gas, together discharge from exhausr port with the flue gas of gas indoor afterwards; The measurement light corresponding to ammonia absorbing wavelength that laser instrument sends through the first optics window laggard enter in gas compartment, pass for nitrogen, flue gas, nitrogen, receive through being detected device after described second optics window afterwards, signal send analysis module, and analysis module draws the content of ammonia in flue gas gas according to DLAS technology.
After monitoring system runs a period of time, close sampler, open source of the gas, the breathing space that pressurized air enters in first passage from third channel expands, and then the flue gas in gas compartment and the compressed nitrogen that enters are drawn into first passage, mixed gas flows in filtrator at a high speed, thus serves reverse cleaning effect, finally enters in flue.
Above-described embodiment is all the flows exemplarily giving flue-gas temperature, metre filter precision, flue gas, certainly can also be other numerical value, if heating-up temperature is 270 DEG C, 240 DEG C, filtering accuracy is 15 μm, 10 μ n, and flow is 27L/min, 23L/min etc.This for a person skilled in the art, on the basis of technical solution of the present invention, technical scheme, the implementation result of other numerical value in protection domain can expect.
Claims (9)
1. a method of work for denitrating flue gas monitoring system, described denitrating flue gas monitoring system comprises sampler, filtration unit, gas compartment and analysis meter; Described denitrating flue gas monitoring system comprises further:
Spacer assembly, described spacer assembly is used for providing gas, and this gas enters in described gas compartment from air intake opening, forms isolated area in the side of the contiguous flue gas of optics, after from exhausr port Exhaust Gas room;
Heating arrangement, described heating arrangement is for heating the pipeline of described filtration unit, gas compartment, connection filtration unit and gas compartment;
Cleaning plant, the third channel that described cleaning plant comprises body, is arranged on the first passage of the described filtration unit of the intrinsic connection be interconnected, is communicated with the second channel of described gas compartment and connection source of the gas, first passage arranges breathing space, angle between described first passage and second channel is obtuse angle or right angle, and the angle between described second channel and third channel is acute angle or right angle;
It is characterized in that: described method of work comprises the following steps:
(A1) close described source of the gas, the flue gas in environment to be measured is transferred to gas compartment by first passage, second channel after sampling, filtration; In this sampling, filtration and transmitting procedure, flue gas is heated;
(A2) gas enters described gas compartment from air intake opening, forms isolated area, keep apart optics and flue gas, afterwards from exhausr port Exhaust Gas room in the side of the contiguous flue gas of optics; Analysis meter detects the content of flue gas in described gas compartment; Flue gas in gas compartment described in testing process is heated;
(A3) described source of the gas is opened, close sampler, the gas that source of the gas provides enters into breathing space in first passage from third channel and expands, thus the flue gas of gas compartment is drawn into first passage by second channel, and combination gas enters and clears up described filtration unit.
2. the method for work of denitrating flue gas monitoring system according to claim 1, is characterized in that: the filtering accuracy of described filtration unit is 5-20 μm.
3. the method for work of denitrating flue gas monitoring system according to claim 1, is characterized in that: described sampler for extracting the flue gas in test environment out, and makes flue gas flow exceed 10L/min in stream.
4. the method for work of denitrating flue gas monitoring system according to claim 3, is characterized in that: flue gas flows exceed 20L/min in stream.
5. the method for work of denitrating flue gas monitoring system according to claim 1, is characterized in that: the temperature of described filtration unit, pipeline and gas compartment is more than 200 DEG C.
6. the method for work of denitrating flue gas monitoring system according to claim 1, is characterized in that: the both sides of described gas compartment arrange optical window, and at least 2 air intake openings are separately positioned on the side that described optical window closes on flue gas.
7. the method for work of denitrating flue gas monitoring system according to claim 6, is characterized in that: described flue gas enters described gas compartment between described air intake opening.
8. the method for work of denitrating flue gas monitoring system according to claim 7, is characterized in that: described exhausr port is arranged on the gas compartment between described air intake opening.
9. the method for work of denitrating flue gas monitoring system according to claim 1, is characterized in that: described analysis meter is laser spectral analysis instrument.
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| CN103728420A (en) * | 2013-12-30 | 2014-04-16 | 聚光科技(杭州)股份有限公司 | Online monitoring method for gas inside pipeline |
| CN104536410B (en) * | 2014-12-22 | 2018-05-15 | 山东应天节能环保科技有限公司 | A kind of desulphurization denitration additive intelligent detection device |
| CN104535515A (en) * | 2014-12-31 | 2015-04-22 | 郑州光力科技股份有限公司 | Gas monitoring probe and gas monitoring system |
| CN104880409B (en) * | 2015-04-29 | 2017-11-28 | 暨南大学 | Device that is a kind of while carrying out photosynthesis of plant and the detection of Radial Oxygen Loss from Root ability and application |
| CN113514207B (en) * | 2021-06-15 | 2024-04-09 | 杭州谱育科技发展有限公司 | Gas detection system and detection method thereof |
| CN114112936A (en) * | 2021-11-25 | 2022-03-01 | 国能国华(北京)电力研究院有限公司 | Near-wall smoke component measuring device and method for boiler water-cooled wall |
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| CN2899734Y (en) * | 2006-01-27 | 2007-05-16 | 广东省职业病防治院 | Movable contamination test device realtime controlled by photoelectric detection |
| CN100504351C (en) * | 2006-07-04 | 2009-06-24 | 王健 | Method and system for monitoring continuous exhaust of smoke |
| JP2011127944A (en) * | 2009-12-16 | 2011-06-30 | Jfe Steel Corp | Method for continuous analysis of dust component in blast furnace exhaust gas |
| JP5422493B2 (en) * | 2010-06-10 | 2014-02-19 | 三菱重工業株式会社 | Gas calorific value measuring device and gas calorific value measuring method |
| CN102103094B (en) * | 2010-12-31 | 2012-06-13 | 聚光科技(杭州)股份有限公司 | Monitoring system for element in gas in pipeline and operation method thereof |
| CN203350180U (en) * | 2013-06-28 | 2013-12-18 | 聚光科技(杭州)股份有限公司 | Flue gas denitrification monitoring system |
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