CN103344590A - 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) technology denitration technology, utilize ammonia and oxides of nitrogen to react, generate water and nitrogen, thereby reach environmental requirement.In order to control the amount that sprays into the raw material ammonia, prevent too much ammonia and sample solid/liquid/gas reactions from generating solid matter and stop up air preheater or the optical window of rear end, need the escape ammonia in the monitoring 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 abominable:
1, dust content is very big in the flue gas, reaches 30-50mg/m
3In the detection for the sampling pretreatment mode, high dust is easy to stop up probe, goes back severe contamination analysis meter, measuring cell.
2, water cut height in the flue gas, if detect ammonia with the traditional analysis instrument, detection can be subjected to the interference of water, accuracy of detection is low.
3, in order effectively to protect probe, need at interval low blowback to pop one's head in, therefore between probe and gas compartment, valve is set, and between valve and probe, the blowback source of the gas is set.Because described valve must be operated in high temperature occasion (flue gas in the pipeline need be accompanied heat), so adopt high temperature resistant valve.This kind valve is expensive, and inner moving component also brings to be safeguarded and life problems.
Based on above-mentioned bad working environments; someone proposes to improve the precision of smoke filtration to reduce dust in flue gas content; analysis meter, measuring cell have been protected so effectively; but improved the maintenance of (very easily stopping up) filtration probe greatly; reduced the serviceable life of filtering probe; reduce the time of continuous monitoring simultaneously, had a strong impact on the closed-loop control of denitrating technique.Also have, the detected ammonia level of analysis meter is compared with the content in the environment, and is on the low side always, but can not find reason all the time.
For these reasons, prior art be can't satisfy fast, the demand of flue gas under the high precision, continuous monitoring denitration environment, can't reach the environment protection standard requirement.Therefore, be implemented in the denitration field continuously, high precision, fast monitored flue gas be a technical barrier that presses for solution.
Summary of the invention
In order to solve the deficiency in the above-mentioned prior art scheme, the invention provides a kind of denitrating flue gas monitoring system, solved in the denitrating flue gas field technical barriers such as high dust, high-moisture, detection error be big, thus realized low-cost in the denitration field, monitor the goal of the invention of composition in the flue gas continuously, fast and in high precision.
The objective 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 further comprises:
Spacer assembly, described spacer assembly are used for gas is provided, and this gas enters in the described gas compartment from air intake opening, and in the side formation isolated area of the contiguous flue gas of optics, gas compartment is discharged from exhausr port in the back;
Heating arrangement, described heating arrangement are used for the pipeline of the described filtration unit of heating, gas compartment, connection filtration unit and gas compartment;
Cleaning plant, described cleaning plant comprises body, is arranged on the first passage of the intrinsic described filtration unit of connection that is interconnected, is communicated with the second channel of described gas compartment and the third channel of connection source of the gas, the breathing space is set on the first passage, 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 μ m.
According to above-mentioned denitrating flue gas monitoring system, preferably, described sampler is used for extracting out the flue gas in the test environment, and makes the flow of flue gas in stream surpass 10L/min.
According to above-mentioned denitrating flue gas monitoring system, preferably, the flow of flue gas in stream surpasses 20L/min.
According to above-mentioned denitrating flue gas monitoring system, preferably, the temperature of described filtration unit, pipeline and gas compartment is above 200 ℃.
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 the described air intake opening.
According to above-mentioned denitrating flue gas monitoring system, preferably, described exhausr port is arranged on the gas compartment between the described air intake opening.
According to above-mentioned denitrating flue gas monitoring system, preferably, described analysis meter is the laser spectral analysis instrument.
The present invention also provides a kind of denitrating flue gas monitoring method, solve in the denitrating flue gas field technical barriers such as high dust, high-moisture, detection error be big, thereby realized in the denitration field, monitoring continuously, fast and in high precision the goal of the invention of composition in the flue gas.This goal of the invention is achieved through the following technical solutions:
The method of work of above-mentioned any denitrating flue gas monitoring system, described method of work may further comprise the steps:
(A1) close described source of the gas, the flue gas in the environment to be measured is transferred to gas compartment through sampling, filtration back by first passage, second channel; Flue gas is heated in this sampling, filtration and transmission course;
(A2) gas enters described gas compartment from air intake opening, in the side formation isolated area of the contiguous flue gas of optics, keeps apart optics and flue gas, discharges gas compartment from exhausr port afterwards; Analysis meter detects the content of flue gas in the described gas compartment; Flue gas in gas compartment described in the testing process is heated;
(A3) open described source of the gas, close sampler, the gas that source of the gas provides enters into breathing space expansion in the first passage from third channel, thereby the flue gas of gas compartment is drawn into first passage by second channel, and combination gas enters and clear up described filtration unit.
Compared with prior art, the beneficial effect that has of the present invention is:
1, cleaning plant is simple in structure, cost is low, high temperature resistant, do not have moving component, good reliability; Substituted original high temperature valve admirably;
2, the gas barrier technology has creatively been proposed, keep apart optics and flue gas, at utmost avoided dust in flue gas to pollute optics, improved the tolerance of gas compartment to dust, even the more dust in the big flow flue gas gets final product so the lower filtration unit of precision is set, reduced the maintenance of filtrator, improve serviceable life, improved the stream time of system simultaneously;
3, flue gas was heated to before discharging gas compartment always and surpasses 200 ℃, made that the moisture in the flue gas keeps gaseous state, had lowered the influence of moisture to detecting, and had correspondingly improved accuracy of detection.The selection absorption line that the laser spectral analysis technology adopts is ideally got rid of the interference of water again;
4, select suitable flue gas flow, made that follow-up testing result and truth deviation are very little, be lower than 1%, greatly reduced the detection error.
Description of drawings
With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art are understood that easily: these accompanying drawings only are used for illustrating technical scheme of the present invention, and are not to be intended to protection scope of the present invention is construed as limiting.Among the figure:
Fig. 1 is the structure diagram according to the denitrating flue gas monitoring system of the embodiment of the invention 1;
Fig. 2 is the process flow diagram according to the denitrating flue gas monitoring method of the embodiment of the invention 1.
Embodiment
Fig. 1,2 and following declarative description optional embodiment of the present invention how to implement with instruction those skilled in the art and reproduce the present invention.In order to instruct technical solution of the present invention, simplified or omitted some conventional aspects.Those skilled in the art should understand that the modification that is derived from these embodiments or replace will be within the scope of the invention.Those skilled in the art should understand that following characteristics can make up to form a plurality of modification of the present invention in every way.Thus, the present invention is not limited to following optional embodiment, and is only limited by claim and their equivalent.
Embodiment 1:
Fig. 1 has schematically provided the structure diagram of the denitrating flue gas monitoring system of the embodiment of the 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 all are the state of the art, do not repeat them here.Sampler is installed on the flue 1.
Heating arrangement, described heating arrangement are used for the pipeline of the described filtration unit of heating, gas compartment, connection filtration unit and gas compartment; Preferably, make flue-gas temperature in filtration unit 2, pipeline 3 and the gas compartment above 200 ℃ by heating.
Spacer assembly, described spacer assembly is used for providing gas, this gas enters in the described gas compartment from air intake opening 61, side at the contiguous flue gas of optics forms isolated area, keep apart optics and flue gas, at utmost avoided dust in flue gas to pollute optics, improved the tolerance of gas compartment to dust, gas is discharged gas compartment from exhausr port.
By at gas compartment spacer assembly being set, make and under the situation that has not reduced detectability, improved the tolerance of gas compartment to dust that reduced the requirement to filtration unit, alternatively, the filtering accuracy of described filtration unit is 5-20 μ m.
In order to improve the precision of subsequent detection, preferably, described sampler is used for extracting out the flue gas in the test environment, and makes the flow of flue gas in stream surpass 10L/min.
In order further to improve the precision of subsequent detection, preferably, the flow of flue gas in described stream surpasses 20L/min.
In order to improve gas compartment to the tolerance of dust, reduce the influence of dust to 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 the described air intake opening.
According to above-mentioned denitrating flue gas monitoring system, preferably, on described exhausr port 63,64 gas compartments that are arranged between the 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 and enters between the gas compartment position.
In order to reduce the adverse effect of moisture to measuring in the flue gas, preferably, the temperature of described filtration unit, pipeline and gas compartment is above 200 ℃.
In order to improve accuracy that gas detects, shorten detection time, to get rid of the interference of other gas, preferably, described analysis meter is the laser spectral analysis instrument, specifically comprises laser instrument 4, detector 5 and analysis module.
Fig. 2 has schematically provided the process flow diagram of the method for work of any above-mentioned denitrating flue gas monitoring system, and as shown in Figure 2, described method of work may further comprise the steps:
(A1) close described source of the gas, the flue gas in the environment to be measured is transferred to gas compartment through sampling, filtration back by first passage, second channel; Flue gas is heated in this sampling, filtration and transmission course;
(A2) gas enters described gas compartment from air intake opening, in the side formation isolated area of the contiguous flue gas of optics, keeps apart optics and flue gas, discharges gas compartment from exhausr port afterwards; Analysis meter detects the content of flue gas in the described gas compartment; Flue gas in gas compartment described in the testing process is heated;
(A3) open described source of the gas, close sampler, the gas that source of the gas provides enters into breathing space expansion in the first passage from third channel, thereby the flue gas of gas compartment is drawn into first passage by second channel, and combination gas enters and oppositely clear up described filtration unit.
The benefit that reaches according to denitrating flue gas monitoring system and the method for present embodiment 1 is: gas forms isolated area in an example of the contiguous flue gas of optics, farthest avoided dust in flue gas to pollute optics, improved the tolerance of gas compartment to dust, so the lower filtrator of precision is set to get final product, reduced the maintenance of filtrator, improve serviceable life, improved the stream time of system simultaneously.Flue gas was heated to before discharging gas compartment always and surpasses 200 ℃, made that the moisture in the flue gas keeps gaseous state, had lowered the influence of moisture to detecting, and had correspondingly improved accuracy of detection.The selection absorption line that the laser spectral analysis technology adopts is ideally got rid of the interference of water again.The suitable of flue gas makes follow-up testing result and truth deviation very, and be little, greatly reduced the detection error.
Embodiment 2:
According to the denitrating flue gas monitoring system of the embodiment of the invention 1 and method in escape ammonia Application in Monitoring example.
In the denitrating flue gas monitoring system of this application examples, filtration unit adopts porcelain filter, and filtering accuracy is 20 μ m; The electrical heating piece is set in the case of filtration unit, at pipeline electric-heating belt is set, the cylinder that gas compartment adopts stainless steel to make is installed in the case with electrical heating piece.The two ends of gas compartment arrange optics window, catoptron respectively, the gas compartment that is close to a side of flue gas at described optics window, catoptron is provided for feeding the air intake opening of isolating with gas, on the gas compartment between two air intake openings (as with the centre of the gas compartment of air intake opening the same side) gas approach is set, two exhausr ports are separately positioned on the gas compartment between gas approach and the air intake opening, more close air intake opening, and and air intake opening (and gas approach) be in the both sides of gas compartment respectively.Analysis meter adopts laser gas analyzer, the laser instrument emission wavelength is corresponding to the absorption line that can get rid of the ammonia that gas such as water disturbs, laser instrument, detector are arranged on the same side of gas compartment and are in the outside of described case, and analysis module also is in outside the case, avoids the influence of being heated.By the heating of heating arrangement, make that the flue-gas temperature in filtration unit, pipeline and the gas compartment surpasses 200 ℃, as 250 ℃, 280 ℃ etc.Gas and the source of the gas of isolating usefulness all adopt pressurized air.Be the right angle between first passage and second channel, the angle between second channel and third channel is 30 degree.
The denitrating flue gas monitoring method is specially:
Close source of the gas, the flue gas in the flue arrives gas compartment by pipeline transmission afterwards through sampling probe, filtration; By the heating of heating arrangement, make that the flue-gas temperature in filtration unit, pipeline and the gas compartment surpasses 200 ℃, as 250 ℃, 280 ℃ etc.; The flow of flue gas in stream is 10L/min;
Pressurized air enters in the gas compartment from air intake opening, side at optics window and the contiguous flue gas of catoptron forms the air insulated district respectively, keep apart flue gas and optics window (and catoptron), prevent dust pollution optics window, catoptron in the flue gas, together discharge from exhausr port with the indoor flue gas of gas afterwards; The measuring light corresponding to the ammonia absorbing wavelength that laser instrument sends passes that the optics window is laggard goes in the gas compartment, pass for the mirror reflection that is reflected behind air, flue gas, the air, pass the air of catoptron side air, flue gas, diaphragm side afterwards again, be detected the device reception after passing described optics window afterwards, signal send analysis module, and analysis module draws the content of ammonia in the flue gas according to the DLAS technology;
After monitoring system is moved a period of time, close sampler, open source of the gas, pressurized air expands from the breathing space that third channel enters in the first passage, and then the flue gas in the gas compartment and the pressurized air that enters be drawn into first passage, mixed gas flows in the filtrator at a high speed, thereby has played reverse cleaning effect, enters in the flue at last.
Embodiment 3:
According to the denitrating flue gas monitoring system of the embodiment of the invention 1 and method in escape ammonia Application in Monitoring example.
In the denitrating flue gas monitoring system of this application examples, filtration unit adopts the silk floss filtrator, and filtering accuracy is 8 μ n; The electrical heating piece is set in filtration unit, at pipeline electric-heating belt is set, the cylinder that gas compartment adopts stainless steel to make is installed in the case with electrical heating piece.The two ends of gas compartment arrange the first optics window, second optical window respectively, the gas compartment that is close to a side of flue gas at the described first optics window, the second optics window is provided for feeding the air intake opening of isolating with gas, on the gas compartment between two air intake openings (as with the centre of the gas compartment of air intake opening the same side) gas approach is set, two exhausr ports are separately positioned on the gas compartment between gas approach and the air intake opening, more close air intake opening, and and air intake opening (and gas approach) be in the both sides of gas compartment respectively.Analysis meter adopts laser gas analyzer, the laser instrument emission wavelength is corresponding to the absorption line that can get rid of the ammonia that gas such as water disturbs, laser instrument, detector are separately positioned on the both sides of gas compartment and are in the outside of described case, and analysis module also is in outside the case, avoids the influence of being heated.By the heating of heating arrangement, make that the flue-gas temperature in filtration unit, pipeline and the gas compartment surpasses 200 ℃, as 220 ℃, 260 ℃ etc.The gas of isolating usefulness 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.
The denitrating flue gas monitoring method is specially:
Close the anger about trifles source, the flue gas in the flue arrives gas compartment by pipeline transmission afterwards through sampling probe, filtration; By the heating of heating arrangement, make that the flue-gas temperature in filtration unit, pipeline and the gas compartment surpasses 200 ℃, as 220 ℃, 260 ℃ etc.; The flow of flue gas in stream is 22L/min;
Compressed nitrogen enters in the gas compartment from air intake opening, side at the first optics window and the contiguous flue gas of the second optics window forms the nitrogen isolated area respectively, keep apart flue gas and optics window, prevent dust pollution optics window in the flue gas, together discharge from exhausr port with the indoor flue gas of gas afterwards; The measuring light corresponding to the ammonia absorbing wavelength that laser instrument sends passes that the first optics window is laggard goes in the gas compartment, pass for nitrogen, flue gas, nitrogen, be detected the device reception after passing the described second optics window afterwards, signal send analysis module, and analysis module draws the content of ammonia in the flue gas according to the DLAS technology.
After monitoring system is moved a period of time, close sampler, open source of the gas, pressurized air expands from the breathing space that third channel enters in the first passage, and then the flue gas in the gas compartment and the compressed nitrogen that enters be drawn into first passage, mixed gas flows in the filtrator at a high speed, thereby has played reverse cleaning effect, enters in the flue at last.
Above-described embodiment all is the flows that exemplarily provided flue-gas temperature, filtrator filtering accuracy, flue gas, certainly can also be other numerical value, be 270 ℃, 240 ℃ as heating-up temperature, filtering accuracy is 15 μ m, 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, the technical scheme of other numerical value in protection domain, implementation result can reckon with.
Claims (10)
1. denitrating flue gas monitoring system, described denitrating flue gas monitoring system comprises sampler, filtration unit, gas compartment and analysis meter; It is characterized in that: described denitrating flue gas monitoring system further comprises:
Spacer assembly, described spacer assembly are used for gas is provided, and this gas enters in the described gas compartment from air intake opening, and in the side formation isolated area of the contiguous flue gas of optics, gas compartment is discharged from exhausr port in the back;
Heating arrangement, described heating arrangement are used for the pipeline of the described filtration unit of heating, gas compartment, connection filtration unit and gas compartment;
Cleaning plant, described cleaning plant comprises body, is arranged on the first passage of the intrinsic described filtration unit of connection that is interconnected, is communicated with the second channel of described gas compartment and the third channel of connection source of the gas, the breathing space is set on the first passage, 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.
2. denitrating flue gas monitoring system according to claim 1, it is characterized in that: the filtering accuracy of described filtration unit is 5-20 μ m.
3. denitrating flue gas monitoring system according to claim 1 is characterized in that: described sampler is used for extracting out the flue gas in the test environment, and makes the flow of flue gas in stream surpass 10L/min.
4. denitrating flue gas monitoring system according to claim 3 is characterized in that: the flow of flue gas in stream surpasses 20L/min.
5. denitrating flue gas monitoring system according to claim 1, it is characterized in that: the temperature of described filtration unit, pipeline and gas compartment is above 200 ℃.
6. denitrating flue gas monitoring system according to claim 1, it 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. denitrating flue gas monitoring system according to claim 6, it is characterized in that: described flue gas enters described gas compartment between the described air intake opening.
8. denitrating flue gas monitoring system according to claim 7 is characterized in that: described exhausr port is arranged on the gas compartment between the described air intake opening.
9. denitrating flue gas monitoring system according to claim 1, it is characterized in that: described analysis meter is the laser spectral analysis instrument.
10. according to the method for work of the arbitrary described denitrating flue gas monitoring system of claim 1-9, described method of work may further comprise the steps:
(A1) close described source of the gas, the flue gas in the environment to be measured is transferred to gas compartment through sampling, filtration back by first passage, second channel; Flue gas is heated in this sampling, filtration and transmission course;
(A2) gas enters described gas compartment from air intake opening, in the side formation isolated area of the contiguous flue gas of optics, keeps apart optics and flue gas, discharges gas compartment from exhausr port afterwards; Analysis meter detects the content of flue gas in the described gas compartment; Flue gas in gas compartment described in the testing process is heated;
(A3) open described source of the gas, close sampler, the gas that source of the gas provides enters into breathing space expansion in the first passage from third channel, thereby the flue gas of gas compartment is drawn into first passage by second channel, and combination gas enters and clear up described filtration unit.
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| CN103344590B (en) | 2015-07-08 |
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