CN209264558U - The continuous on-line monitoring system of flue gas - Google Patents
The continuous on-line monitoring system of flue gas Download PDFInfo
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- CN209264558U CN209264558U CN201822140457.9U CN201822140457U CN209264558U CN 209264558 U CN209264558 U CN 209264558U CN 201822140457 U CN201822140457 U CN 201822140457U CN 209264558 U CN209264558 U CN 209264558U
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Abstract
The utility model discloses the continuous on-line monitoring systems of flue gas, comprising: flue sampler, heat tracing pipe, flue gas pretreatment system, HC remover and flue gas concentration analyzer, wherein heat tracing pipe is connected with flue sampler；Flue gas pretreatment system is connected with heat tracing pipe, and is suitable for carrying out flue gas the pretreatment before concentration analysis；The upstream or downstream of flue gas pretreatment system is arranged in HC remover, and HC remover includes ventilation pipe and heating element, and heating element is suitable for the flue gas passed through in ventilation pipe to 200 degrees Celsius or more；Flue gas concentration analyzer is connected with flue gas pretreatment system or HC remover.Therefore, the continuous on-line monitoring system of the flue gas can effectively eliminate the interference that hydrocarbon detects ultraviolet spectra or infrared spectroscopy, improve the accuracy of flue gas inspection.
Description
Technical field
The utility model belongs to flue gas inspection field, specifically, continuously monitoring on-line the utility model relates to flue gas and being
System.
Background technique
The continuous on-line monitoring system of flue gas is the equipment continuously monitored on-line to stationary source sewage draining exit, passes through 24
Hour continual monitoring sewage draining exit polluter, such as SO2With the concentration of NOx, realize Environmental Protection Agency to stationary source enterprise
Blowdown condition monitoring.The continuous on-line monitoring system of flue gas is generally divided into flue gas pretreatment part, flue gas concentration analysis part sum number
It is grouped as according to storage upload unit.
Flue gas pretreatment part extracts the flue gas of sewage draining exit out sewage draining exit, and it is dense to be sent into flue gas after pre-processing to flue gas
Degree analyzer is analyzed.Since flue gas has high temperature, high humidity, characteristic dusty, whole heat tracing is needed in sampling process,
The temperature of heat tracing needs to install the dust filter unit of small-bore in sampler front generally at 140 degree, so that into heat tracing
The flue gas of pipe is free of dust particles.When flue gas enters that analyzer is small behind the house by heat tracing pipe, one 4 degree of condensation can be passed through
Flue-gas temperature is reduced to 4 degree rapidly by device, so that most of moisture condensation in flue gas is liquid water and is arranged by peristaltic pump
Cabin out.The process of flue gas condensing must be very fast, otherwise the SO in flue gas2It is to be measured to cause that gas can be dissolved in condensed water
The loss of concentration of component.Pretreated flue gas squeezes into point that flue gas concentration analyzer carries out pollutant concentration by sampling pump
Analysis.
Flue gas concentration analyzer currently on the market mainly has ultraviolet spectroscopy and two kinds of infra-red sepectrometry.Two methods
Principle is all: according to the Beer-Lambert law of gas molecules sorb, light beam passes through the sample gas in analysis cell,
Since gas is to the absorption of light, light energy will decay, and is tested absorption of the gas in af at wavelength lambda to light intensity, can be used to
Lower formula accurate description:
In formula:
I0(λ) --- incident light is in af at wavelength lambda relative intensity；
I (λ) --- emergent light is in af at wavelength lambda relative intensity；
L --- light path；
Ci--- i-th kind of gas concentration；
σi(λ) --- the absorption coefficient of i-th kind of gas；
ε (λ) --- extinction coefficient caused by the factors such as KPT Scatter.
The difference of ultraviolet spectroscopy and infra-red sepectrometry is for monitoring SO2With the spectral wavelength ranges of NOx, ultraviolet method
Ultraviolet band of the wave-length coverage in 200-400nm, middle infrared band of the wave-length coverage that infrared method uses in 3-6um.
For ultraviolet method and infrared method flue gas concentration analyzer, scene is other using the greatest problem being likely encountered
The absorption bands and SO of gas molecule2It is identical with the absorption bands of NOx, cause cross jamming.Fortunately, most flue gases
The scene that continuous on-line monitoring system uses there's almost no this kind of interference gas, so the continuous on-line monitoring system of flue gas is big
Part occasion can normal use.But for particular applications such as biomass power generation, waste incinerations, due to the combustion used
Material is some wastes, and the structure of matter is very complicated, and due to fuel problem, it is difficult to which full combustion exists and do not fill largely
The intermediate product of divided combustion, such as HC substance.And HC substance spectrally exists largely in absorption line, from ultraviolet to infrared
All exist.In ultraviolet fluctuation, HC substance can absorb the wavelength of 300nm once, and the flue gas analyzer of ultraviolet spectroscopy is caused to exist
There are great errors in the measurement of NO.And in infrared band, the absorption spectrum of HC substance just with SO2Measure spectrum weight
It closes, it can serious influence SO2Measurement.Show currently, generating a large amount of HC interfering substances to this biomass power generation, waste incineration
, ultraviolet spectroscopy flue gas monitoring system and infrared method flue gas monitoring system all can not normal uses.
Therefore, the existing continuous on-line monitoring system of flue gas is further improved at present.
Utility model content
The utility model is intended to solve at least some of the technical problems in related technologies.For this purpose, this reality
It is to propose that one kind can effectively eliminate hydrocarbon and do ultraviolet spectra or infrared spectroscopy inspection with a novel purpose
The continuous on-line monitoring system of the flue gas disturbed.
One aspect according to the present utility model, the utility model proposes a kind of continuous on-line monitoring system of flue gas, roots
According to the embodiments of the present invention, the continuous on-line monitoring system of the flue gas includes:
Flue sampler；
Heat tracing pipe, the heat tracing pipe are connected with the flue sampler；
Flue gas pretreatment system, the flue gas pretreatment system are connected with the heat tracing pipe, and are suitable for carrying out flue gas dense
Pretreatment before degree analysis；
The upstream or downstream of the flue gas pretreatment system is arranged in HC remover, the HC remover, and the HC is gone
Except device includes ventilation pipe and heating element, the heating element is suitable for the flue gas passed through in the ventilation pipe extremely
200 degrees Celsius or more；
Flue gas concentration analyzer, the flue gas concentration analyzer and the flue gas pretreatment system or the HC remover
It is connected.
HC remover is provided in the continuous on-line monitoring system of the flue gas of the utility model embodiment as a result, flue gas passes through
When the ventilation pipe of HC remover, heating element can be to the flue gas in ventilation pipe to 200 degrees Celsius or more.And then it can
It is water and carbon dioxide by HC burning conversion, it is possible thereby to effectively eliminate the HC compound in flue gas, together to light HC substance
When do not generate harmful substance.And then it is possible to prevente effectively from interference of the HC substance to subsequent flue gas analyzer measurement result, thus
The continuous on-line monitoring system of flue gas is monitored the flue gas containing high concentration HC, while improving the standard of monitoring concentration
Exactness.In addition, can make ultraviolet spectroscopy flue gas monitoring and infrared method flue gas monitoring can due to increasing above-mentioned HC remover
Applied to the operating condition scene of a large amount of HC interfering substances of the generations such as biomass power generation, waste incineration, and then significantly improve flue gas company
The scope of application of continuous on-line monitoring system.
In addition, can also be had according to the continuous on-line monitoring system of flue gas of the utility model above-described embodiment following additional
Technical characteristic:
In some embodiments of the utility model, the flue gas pretreatment system includes:
Condenser, the condenser are connected with the HC remover or the heat tracing pipe；
Sampling pump, the sampling pump are connected with the condenser；
Acid mist filter, the acid mist filter are connected with the sampling pump；
Nitrogen oxides converter, the nitrogen oxides converter are connected with the acid mist filter.
In the present invention, the ventilation pipe is formed by metal tube or quartz ampoule.
In the present invention, the ventilation pipe is made of the room temperature section of intermediate high temperature section and both ends, the heating
Component is suitable for heating the high temperature section.
In the present invention, the outer diameter of the ventilation pipe is 0.5-30mm, the length 0.1-25m of the high temperature section.
In the present invention, the room temperature section at both ends is 20cm.
In the present invention, the heating element is suitable for the high temperature section heating 200-1500 degrees Celsius.
In the present invention, the high temperature section spirals into cylindrical shape or serpentine-like squarely of spiraling.
In the present invention, the heating element is by the ventilation pipe and interlayer that are set on the outside of the high temperature section tube wall
The heat medium composition being passed through.
In the present invention, the high temperature section spirals into cylindrical shape, and the heating element is heating rod, the heating rod
The high temperature section is arranged in spiral in the cylinder to be formed.
Detailed description of the invention
Fig. 1 is the structural schematic diagram according to the continuous on-line monitoring system of flue gas of the utility model one embodiment.
Fig. 2 is that the structure of HC remover in the continuous on-line monitoring system of flue gas according to the utility model one embodiment is shown
It is intended to.
Fig. 3 is that the structure of HC remover in the continuous on-line monitoring system of flue gas according to the utility model one embodiment is shown
It is intended to.
Fig. 4 is the uv absorption spectra continuously monitored on-line according to the flue gas of the utility model one embodiment.
Fig. 5 is the uv absorption spectra continuously monitored on-line according to the flue gas of the utility model one embodiment.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
The utility model is completed based on following discovery:
Current existing HC remover mostly uses film permeation principle, that is, utilizes film two sides HC concentration difference so that HC from
High concentration side penetrates into low concentration side, and low concentration side is realized by the way that cleaned air purging is ceaselessly added, to remove
The HC substance at high concentration end.But this HC remover is fatal using then haveing the defects that at flue gas monitoring scene.Flue gas first
In have some pollutants more and can directly result in film poisoning and fail, secondly the concentration of this kind of HC remover requirement HC cannot be too
Height, otherwise film can equally fail.Therefore, this kind of HC remover is not particularly suited for the processing of removal flue gas.
For this purpose, one aspect according to the present utility model, is continuously monitored on-line the utility model proposes a kind of flue gas and be
System.Below with reference to Fig. 1 detailed description according to the continuous on-line monitoring system of flue gas of the utility model embodiment.
Specific embodiment according to the present utility model, the continuous on-line monitoring system of flue gas include: flue sampler 100, companion
Heat pipe 200, flue gas pretreatment system 300, HC remover 400 and flue gas concentration analyzer 500.
Wherein, heat tracing pipe 200 is connected with flue sampler 100；Flue gas pretreatment system 300 is connected with heat tracing pipe 200, and
Suitable for the pretreatment before flue gas progress concentration analysis；HC remover 400 be arranged in flue gas pretreatment system 300 upstream or
Downstream, it includes ventilation pipe 410 and heating element 420 that HC, which removes 400 devices, and heating element 420 is suitable for leading to in ventilation pipe 410
The flue gas crossed is to 200 degrees Celsius or more；Flue gas concentration analyzer 500 and flue gas pretreatment system 300 or HC remover
400 are connected.
HC remover is provided in the continuous on-line monitoring system of the flue gas of the utility model embodiment as a result, flue gas passes through
When the ventilation pipe 410 of HC remover 400, heating element 420 can be to the flue gas in ventilation pipe 410 to 500 Celsius
Degree or more.And then HC substance can be lighted, it is water and carbon dioxide by HC burning conversion, it is possible thereby to effectively eliminate in flue gas
HC compound, while without generate harmful substance.And then it is possible to prevente effectively from HC substance measures knot to subsequent flue gas analyzer
The interference of fruit mentions simultaneously so that the continuous on-line monitoring system of flue gas can be monitored the flue gas containing high concentration HC
The accuracy of height monitoring concentration.In addition, due to increasing above-mentioned HC remover, ultraviolet spectroscopy flue gas monitoring and infrared can be made
Method flue gas monitoring can be applied to the operating condition scene of a large amount of HC interfering substances of generations such as biomass power generation, waste incineration, Jin Erxian
Write the scope of application for improving the continuous on-line monitoring system of flue gas.
Specific embodiment according to the present utility model, flue gas pretreatment system 300 include: condenser 310, sampling pump 320,
Acid mist filter 330 and nitrogen oxides converter 340.Wherein, the condenser 310 and the HC remover 400 or described
Heat tracing pipe 200 is connected；The sampling pump 320 is connected with the condenser 310；The acid mist filter 330 and the sampling pump
320 are connected；The nitrogen oxides converter 340 is connected with the acid mist filter 330.It is possible thereby to effectively be carried out to flue gas
Pretreatment improves the accuracy rate of flue gas concentration analysis.
Specific embodiment according to the present utility model, the ventilation pipe 410 of HC remover 400 is by metal tube or quartz ampoule
It is formed.Thus have higher by thermal energy power.200 degrees Celsius or more can be heated to, and then can be effectively to ventilation
Flue gas in pipeline 410 is heated.
Specific embodiment according to the present utility model, the outer diameter of ventilation pipe 410 are 0.5-30mm.Specifically, it can adopt
It is the ventilation pipe of 0.5mm, 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm specification with outer diameter.Inventors have found that ventilation
The caliber of pipeline is not easy too large or too small, be easy to cause the too big heating of exhaust gas volumn uneven if caliber is excessive, causes hydrocarbon
Compound removal is not thorough, and flue gas conveying speed can be reduced if caliber is too small, is unable to satisfy flue gas measurement request.
Specific embodiment according to the present utility model cannot fill any catalyst or particulate matter in ventilation pipe 410,
Avoid SO2Gas absorption ventilation pipe 31 0 inner surface, thus the accuracy of impact analysis instrument measurement of concetration.
Specific embodiment according to the present utility model, since temperature is higher in use for ventilation pipe 410, in order to keep away
Exempt to impact adjacent heat tracing pipe 200 and condenser 310.Specific example according to the present utility model, by ventilation pipe 410
Be made of the room temperature section 412 of intermediate high temperature section 411 and both ends, heating element 420 only to the high temperature section 411 to middle position into
Row heating.It can achieve temperature buffer and flue gas from there through room temperature section 412 has been reserved respectively at the both ends of ventilation pipe 410
Cooling effect, and then effectively high temperature is avoided to impact adjacent heat tracing pipe 200 and condenser 310.
The length of specific example according to the present utility model, the room temperature section 412 at both ends is 20cm.Thus when high temperature section adds
When heat is to 200 degrees Celsius or more, it is possible to prevente effectively from being impacted to heat tracing pipe 200 and condenser 310, while the room temperature in downstream
Section 412 has suitable length, it is also possible that the flue gas of high temperature obtains effective temperature-reducing, and then avoids increasing subsequent condensation device 310
Energy consumption.
In addition, specific embodiment according to the present utility model, the length 0.1-25m of high temperature section 411.It is possible thereby to guarantee pair
The abundant heating of flue gas, so that hydrogen compound fully burning conversion Cheng Shui and carbon dioxide, and then avoid hydrocarbon
Interference to subsequent detection result improves the accuracy of detection.
Specific embodiment according to the present utility model, heating element are suitable for high temperature section heating 200-1500 degrees Celsius.Example
Such as can for 250 degrees Celsius, 300 degrees Celsius, 400 degrees Celsius, 500 degrees Celsius, 600 degrees Celsius, 700 degrees Celsius, it is 500 Celsius
Degree, 900 degrees Celsius, 1100 degrees Celsius, 1200 degrees Celsius, 1300 degrees Celsius, 1400 degrees Celsius, 1500 degrees Celsius.Preferably.Add
Thermal part is suitable for high temperature section heating 500-1000 degrees Celsius.Thus it is heated in the temperature range, can effectively ensure that removal
Most HC substances, while can guarantee the SO that flue gas needs to measure2, NOx gas is anti-by occurring because of excessively high temperature
It answers, to avoid influencing measurement result.Specifically, it can be heated to.And specific temperature can also be dense according to interference hydro carbons
The size of degree is adjusted, and then guarantees to be effectively removed most HC substances.
Specific embodiment according to the present utility model, as Figure 2-3, above-mentioned high temperature section 411 can spiral into cylindrical shape,
Or serpentine-like squarely of spiraling.It is possible thereby to save space.
Specific embodiment according to the present utility model, heating element 420 can be logical on the outside of high temperature section tube wall by being set in
The heat medium composition that feed channel and interlayer are passed through.It is pressed from both sides it is possible thereby to be formed using the ventilation pipe and high temperature section of heating element
Set, intermediate heat medium heat high temperature section, this kind of heating method can heat all tube walls of high temperature section, therefore
Heating efficiency is higher, and heats more uniform, thereby may be ensured that cigarette hydrocarbon in gas effectively removes.
Specific embodiment according to the present utility model, above-mentioned high temperature section 411 can spiral into cylindrical shape, heating element 420
It can be heating rod, and heating rod is spiraled by the way that high temperature section 411 is arranged in and added in the cylinder to be formed to high temperature section 411
Heat.
Specific embodiment according to the present utility model, flue gas concentration analyzer have ultraviolet spectra detector or infrared light
Compose detector.There can be the hydrocarbon removed in flue gas by the way that HC remover is arranged.And for ultraviolet method and infrared method cigarette
There are a large amount of insufficient combustions for gas concentration analyzer, in the flue gas that generates in particular fields such as biomass power generation, waste incinerations
The intermediate product of burning, such as HC substance.And HC substance spectrally exists largely in absorption line, all deposits from ultraviolet to infrared
?.In ultraviolet fluctuation, HC substance can absorb 300nm wavelength below, cause the flue gas analyzer of ultraviolet spectroscopy NO's
There are great errors in measurement.And in infrared band, the absorption spectrum of HC substance just with SO2Measure spectrum be overlapped,
It can serious influence SO2Measurement.And pass through setting in the continuous on-line monitoring system of flue gas of the utility model above-described embodiment
HC remover can have the hydrocarbon in removal flue gas, and then it is possible to prevente effectively from subsequent use ultraviolet spectra detector
Either infrared spectroscopy detector is to NO or SO2Concentration mensuration interfere, significantly improve the accuracy of measurement.Therefore, originally
The continuous on-line monitoring system of the flue gas of utility model embodiment can be applied to a large amount of HC of the generations such as biomass power generation, waste incineration
The operating condition scene of interfering substance.
Embodiment
Be respectively adopted the utility model embodiment the continuous on-line monitoring system of flue gas and it is existing do not have HC remover
The continuous on-line monitoring system of flue gas respectively detects flue gas.
Wherein, the continuous on-line monitoring system of the flue gas of the utility model embodiment includes: flue sampler 100, heat tracing pipe
200, HC remover 400, condenser 310, sampling pump 320, acid mist filter 330, nitrogen oxides converter 340 and flue gas concentration
Analyzer 500, the outer diameter in 400 Center Vent tube road of HC remover are 3.2mm, the length 2.0m of high temperature section, the room temperature section at both ends
Length is 20cm, and heating element is suitable for the high temperature section heating 550 degrees Celsius.Flue gas concentration analyzer is ultraviolet spectra inspection
It surveys, Detection wavelength 195-320nm.
The result of on-the-spot test is shown in Fig. 4-5.Fig. 4 is without the continuous on-line monitoring system of HC remover flue gas respectively to cigarette
The result that gas is detected；Fig. 5 is the knot detected respectively to flue gas with the continuous on-line monitoring system of HC remover flue gas
Fruit；
Conclusion:
Since a large amount of HC class interfering substance is contained at biomass scene in Fig. 4, so ultra-violet absorption spectrum is inhaled by HC completely
It receives spectrum to cover, can't see the absorption spectrum of characteristic absorption substance NO.Fig. 5 is that the effect of HC remover is added under same operating
Fruit is schemed, as it can be seen that HC remover eliminates the HC substance of the overwhelming majority in figure, can obviously be seen in the ultra-violet absorption spectrum in figure
To the absorption spectrum (region between two red lines) of NO.
As it can be seen that the continuous on-line monitoring system of flue gas with HC remover of the utility model is a large amount of for containing in flue gas
Hydrocarbon flue gas detection have extraordinary effect.So as to meet the spies such as biomass power generation, waste incineration
The use at different operating condition scene.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
Identical embodiment or example need not be directed to by stating.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiment or examples.In addition, without conflicting with each other, this field
Technical staff can carry out the feature of different embodiments or examples described in this specification and different embodiments or examples
Combination and combination.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (10)
1. a kind of continuous on-line monitoring system of flue gas characterized by comprising
Flue sampler；
Heat tracing pipe, the heat tracing pipe are connected with the flue sampler；
Flue gas pretreatment system, the flue gas pretreatment system are connected with the heat tracing pipe, and are suitable for carrying out concentration point to flue gas
Pretreatment before analysis；
The upstream or downstream of the flue gas pretreatment system, the HC remover is arranged in HC remover, the HC remover
Including ventilation pipe and heating element, the heating element is suitable for taking the photograph the flue gas passed through in the ventilation pipe to 200
Family name degree or more；
Flue gas concentration analyzer, the flue gas concentration analyzer and the flue gas pretreatment system or the HC remover phase
Even.
2. the continuous on-line monitoring system of flue gas according to claim 1, which is characterized in that the flue gas pretreatment system packet
It includes:
Condenser, the condenser are connected with the HC remover or the heat tracing pipe；
Sampling pump, the sampling pump are connected with the condenser；
Acid mist filter, the acid mist filter are connected with the sampling pump；
Nitrogen oxides converter, the nitrogen oxides converter are connected with the acid mist filter.
3. the continuous on-line monitoring system of flue gas according to claim 1, which is characterized in that the ventilation pipe is by metal tube
Or quartz ampoule is formed.
4. the continuous on-line monitoring system of flue gas according to claim 3, which is characterized in that the ventilation pipe is by centre
High temperature section and the room temperature section at both ends composition, the heating element are suitable for heating the high temperature section.
5. the continuous on-line monitoring system of flue gas according to claim 4, which is characterized in that the outer diameter of the ventilation pipe is
0.5-30mm, the length 0.1-25m of the high temperature section.
6. the continuous on-line monitoring system of flue gas according to claim 5, which is characterized in that the length of the room temperature section at both ends
Degree is 20cm.
7. the continuous on-line monitoring system of flue gas according to claim 6, which is characterized in that the heating element is suitable for institute
It states high temperature section and is heated to 200-1500 degrees Celsius.
8. the continuous on-line monitoring system of flue gas according to claim 7, which is characterized in that the high temperature section spirals into cylinder
Shape or serpentine-like squarely of spiraling.
9. the continuous on-line monitoring system of flue gas according to claim 8, which is characterized in that the heating element is by being set in
The heat medium composition that ventilation pipe and interlayer on the outside of the high temperature section tube wall are passed through.
10. the continuous on-line monitoring system of flue gas according to claim 7, which is characterized in that the high temperature section spirals into circle
Tubular, the heating element are heating rod, and the heating rod is arranged in the high temperature section and spirals in the cylinder to be formed.
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