CN104792581A - Sampling device for smoke discharge gas - Google Patents
Sampling device for smoke discharge gas Download PDFInfo
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- CN104792581A CN104792581A CN201510226709.8A CN201510226709A CN104792581A CN 104792581 A CN104792581 A CN 104792581A CN 201510226709 A CN201510226709 A CN 201510226709A CN 104792581 A CN104792581 A CN 104792581A
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- sampling
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- sampler
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- emission gas
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Abstract
The invention discloses a sampling device for smoke discharge gas. The sampling device comprises a plurality of sampling pipelines, a mother pipe, a sampling platform, a sampling probe, an air pre-heater and an analyzer, wherein each of the sampling pipelines is respectively provided with a plurality of sampling opening; the sampling pipelines are respectively connected with the mother pipe; the mother pipe is provided with a primary reducing part and a secondary reducing part at the sampling platform, and a buffer tank is formed in the middle part between the primary reducing part and the secondary reducing part; the mother pipe passes through the sampling platform and is connected with the air pre-heater to form a measurement bypass; the sampling probe is located in the buffer tank, and the signal output end of the sampling probe is connected with the analyzer. The sampling device for smoke discharge gas disclosed by the invention can be used for accurately and reliably sampling and measuring the concentration of the smoke discharge gas.
Description
Technical field
The present invention relates to gas sample detection field, particularly relate to a kind of sampler of fume emission gas.
Background technology
Data display according to statistics, the Eleventh Five-Year Plan period, the quick growth of discharged nitrous oxides exacerbates the degradating trend of region acid rain, the great efforts that partial offset China pays in sulphuric dioxide reduction of discharging.Due to the severe situation that oxides of nitrogen controls the adverse effect of atmospheric environment and current thermal power plant discharged nitrous oxides, national environmental protection portion has promulgated " thermal power plant's oxides of nitrogen technological policy for treatment " at the beginning of 2010, proposes the planning and the requirement that control discharged nitrous oxides in " during 12 ".The emphasis that this technical policy controls is domestic 200MW and above Thermal generation unit, and all Thermal generation unit in atmospheric pollution priority control region and cogeneration units.Meanwhile, mandatory " thermal power plant's air pollution emission standard " of appearance strictly will carry out denitration norm controlling.
Current domestic power plant mainly uses selective catalytic reduction (SCR) gas denitrifying technology.SCR method adopts NH
3as reductive agent, by NO
xbe reduced into N
2.NH
3selective, it only and NO react, and not with the O in flue gas
2reaction.Otherwise, O
2nH can be promoted
3with the reaction of NO.Its optimal reaction temperature is 300 ~ 400 DEG C, is equivalent to the cigarette temperature of economizer exit to air preheater porch.The denitration rate of SCR method can reach 80% ~ 90%.
Country " 12 " period, denitrating flue gas project as a mandatory project of thermal power plant, and is included in environmental protection tests project.Smoke on-line monitoring system CEMS reflects the effect that fume treatment environmental protecting device runs, and is the necessary means of environmental administration to the management of discharge enterprise's supervision.
Current domestic denitration CEMS metering system is mainly: the direct method of measurement, extraction method, dilution method.General by infra-red sepectrometry to NO
xdetect.Method conventional is at present companion's hot-plug method.Its sampler is generally directly in the perforate of denitration exhaust pass, choose a representative 1-3 position, respective independent sampler is installed, its probe material of different manufacturers is different with insertion depth, set up 1-3 cover and independently sample preprocessing loop, analyzing by entering analyser detecting unit after mixing, finally drawing NO
xdetected value.
Current fuel-burning power plant denitrating system adopts single-point or multiple spot (maximum 3 points) pattern to NO
xdetection sampling, be subject to the impact of the distribution character of flue gas flow field self, denitration outlet NO cannot be represented
xthe truth of concentration discharge, the reliability of its monitoring and accuracy DeGrain, also exist measurement system error.
Therefore, a kind of sampler that accurately can detect the concentration of fume emission gas is provided to be necessary.
Summary of the invention
The object of this invention is to provide a kind of sampler of fume emission gas, object is to solve problem not high to the sampling detection accuracy of fume emission gas in prior art.
For solving the problems of the technologies described above, the invention provides a kind of sampler of fume emission gas, comprising:
Multiple sampling pipe, female pipe, sampling platform, sampling probe, air preheater and analyser;
Wherein, each sampling pipe is respectively equipped with multiple sample tap; Described sampling pipe is connected with described female pipe respectively, and described female pipe has reduced diameter portion and second time reduced diameter portion for the first time at described sampling platform place, the center section for the first time after reducing and before the second reducing forms surge tank; Sample described in described female Guan Jing after platform and be connected with described air preheater, formed and measure bypass; It is inner that described sampling probe is positioned at described surge tank, and the signal output part of described sampling probe is connected with described analyser.
Alternatively, described sampling pipe is eight, and every root sampling pipe is provided with four sample taps, and one end of described sampling pipe is in free expansion state, and the distance between flue is preset value, is positioned at stabilized zone, fume emission mouth flow field.
Alternatively, also comprise:
Angle bar and parallels; Described angle bar is positioned on described sampling pipe, and described parallels is positioned at the bottom of the free expansion end of described sampling pipe.
Alternatively, by equal tee after platform of sampling described in described female Guan Jing, be connected with the exhaust pass of the first air preheater and the second air preheater respectively.
Alternatively, also comprise:
First hand stop valve, between described sampling pipe and described female pipe.
Alternatively, also comprise:
Second hand stop valve, between described mother's pipe and described sampling platform.
Alternatively, also comprise:
3rd hand stop valve and the 4th hand stop valve, position before laying respectively at described female pipe first time reducing and after second time reducing.
Alternatively, also comprise:
Use mixedly air and purge pipeline, position before laying respectively at described 3rd hand stop valve and after the first hand stop valve.
Alternatively, described sampling probe and pipeline adopt Flange joint, the consistent size of ring flange size and described sampling probe mounting flange.
Alternatively, described analyser is denitration exiting flue gas analyser, and described sampling probe is connected with described denitration exiting flue gas analyser by heat tracing pipe.
The sampler of fume emission gas provided by the present invention, by carrying out array sampled measurements to flue gas, the flue gas at diverse location place is pooled in female pipe and mixes, be directly connected on air preheater exhaust pass by surge tank again, utilize the pressure reduction that exhaust pass exports to air preheater, realize the circulation naturally that gas bypass is measured, and realize Homogeneous phase mixing by continuing flowing, this measurement bypass carries out flue gas multidraw again, mix to obtain, representative strong flue gas, sampling and measuring accurately and reliably can be carried out to the concentration of fume emission gas.
Accompanying drawing explanation
The schematic diagram of the sampler of the fume emission gas that Fig. 1 provides for the embodiment of the present invention;
Sampling pipe distribution schematic diagram in the sampler of the fume emission gas that Fig. 2 provides for the embodiment of the present invention;
In the sampler of the fume emission gas that Fig. 3 provides for the embodiment of the present invention, single sampling pipe arranges schematic diagram;
Gasmetry bypass schematic diagram is installed additional in the sampler of the fume emission gas that Fig. 4 provides for the embodiment of the present invention.
Embodiment
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of sampler of fume emission gas, this device comprises:
Multiple sampling pipe, female pipe, sampling platform, sampling probe, air preheater and analyser;
Wherein, each sampling pipe is respectively equipped with multiple sample tap; Described sampling pipe is connected with described female pipe respectively, and described female pipe has reduced diameter portion and second time reduced diameter portion for the first time at described sampling platform place, the center section for the first time after reducing and before the second reducing forms surge tank; Sample described in described female Guan Jing after platform and be connected with described air preheater, formed and measure bypass; It is inner that described sampling probe is positioned at described surge tank, and the signal output part of described sampling probe is connected with described analyser.
The sampler of fume emission gas provided by the present invention, by carrying out array sampled measurements to flue gas, the flue gas at diverse location place is pooled in female pipe and mixes, be directly connected on air preheater exhaust pass by surge tank again, utilize the pressure reduction that exhaust pass exports to air preheater, realize the circulation naturally that gas bypass is measured, and realize Homogeneous phase mixing by continuing flowing, this measurement bypass carries out flue gas multidraw again, mix to obtain, representative strong flue gas, sampling and measuring accurately and reliably can be carried out to the concentration of fume emission gas.
NO
x(oxides of nitrogen) refers to the compound be only made up of nitrogen, oxygen two kinds of elements.Common oxides of nitrogen has nitrogen monoxide (NO, colourless), nitrogen dioxide (NO
2, rufous), laughing gas (N
2o), nitrogen pentoxide (N
2o
5) etc.Cause mainly nitrogen monoxide (NO) and the nitrogen dioxide (NO of atmospheric pollution
2), the oxides of nitrogen (NO therefore in environmentology
x) the general general name just referring to both.In the oxides of nitrogen that thermal power plant discharges at first, NO accounts for 95%, but NO very easily reacts with the oxygen in air in an atmosphere, generates NO
2, NO
2more stable, therefore NO in air
xgeneral with NO
2form exist.Scientific research result shows, oxides of nitrogen is except injuring except health as primary pollution, also can produce multiple secondary pollution, some pollutants are made to form secondary aerosol species, for example, sulfate, nitrate etc., contaminated air, damage the ozone layer, make the On The Deterioration of Visibility Over of air, form acid rain, cause soil and water pollution etc.
Therefore, before fume emission, need to carry out denitration process to the oxides of nitrogen in flue gas.Denitration refers to by chemical reaction, as selective catalytic reduction (SCR), SNCR method (SNCR) plasma method, alkali absorption method etc., will remove the process of oxides of nitrogen in combustion product gases.
Existing fired power generating unit operationally, along with the change of operating condition, desulfurization and denitration exiting flue gas NO
xthere is certain deviation in concentration, its deviation random groups working conditions change randomness is comparatively large, denitration outlet NO
xconcentration Testing is representative not enough, controls to bring very large difficulty to unit environmental protection index.
In the present embodiment, for how better realizing the on-line measurement of denitrating system Gas Parameters, ensure environmental protection Parameter N O
xdeng monitoring accurately and reliably, provide a kind of fume emission NO
xsampler.
As shown in Figure 1, the sampler of fume emission gas that the present embodiment provides comprises:
Multiple sampling pipe, female pipe, sampling platform, sampling probe, air preheater and analyser;
In the present embodiment, multiple sampling pipe can be set in flue gas flow field stabilized zone, each sampling pipe is respectively equipped with multiple sample tap, to increase the quantity of sample tap, realize flue longitudinal non-blind area sampling.Particularly, 8 can be selected in the present embodiment
pipeline, as sampling pipe, every root sampling pipe all arranges four sample taps
amount to 32 sample taps, as shown in Figure 2.
As a kind of preferred implementation, can also in flue 8
add #70 angle bar above pipeline and carry out abrasionproof, flue interior conduit one end is in free expansion state, reserves 120mm expansion clearance, as shown in Figure 3 with flue.The port Plate Welding of pipe expansion free end blocks, and at the wear-resisting parallels of free end of pipeline lower weld, prevents pipe expansion skimming wear.In addition, 8
pipeline installs suspension and support additional in flue domestic demand, and the distance between suspension and support is not more than 3.5m, and outlet section and flue carry out dual face seals and weld.
It is pointed out that the dot matrix quantity of dot matrix sampler in the present embodiment, distribution and facilities all can adopt other forms, this does not affect realization of the present invention.
Utilize differential pressure power before and after air preheater, set up the gasmetry bypass being exported to air preheater outlet from denitration, as shown in Figure 4.By above-mentioned 32 sampling spots by 8
pipe influx is to 1
in female pipe, as shown in pipe 1 female in Fig. 1, at 8
pipeline with
8 the first hand stop valves (DN80, J41Y-64P 1Cr18Ni9Ti) are installed additional between female pipe, at the center, left and right of female pipe, downward by threeway
vertically cause 44.8 meters of smoke sampling platforms, below threeway, 1 meter of installs second hand stop valve (DN100, J61Y-64P) additional.The lower 3 meters of correct positions of this hand stop valve, install type metal expansion joint additional.
Twice reducing is carried out at 44.8 meters of platform place pipelines
with
duct length is about 1.5m (can adjust according to scene is actual),
pipe installing 2 smoke sampling probes, sampling probe and flue 70 ° of angles are inserted in pipeline obliquely.Sampling probe and pipeline adopt Flange joint, and ring flange size and probe mounting flange consistent size, flange outer sleeve pipe is of a size of
again lay two-way heat tracing pipe to denitration exiting flue gas analyser cabinet from sampling probe, analyser cabinet lays again to sampling probe power supply, signal cable.The shutoff of former sampling probe mounting flange cover plate gives over to for subsequent use.
At the female pipe reducing of this platform
before, reducing
rear each installation the 3rd hand stop valve and the 4th hand stop valve (DN100, J41Y-64P), before and after two stop valves, the air of using mixedly of each road DN50 of installation purges pipeline and valve.After smoke sampling platform
on pipeline, correct position installs stainless steel metal expansion joint additional.If mounted valve position is not easy to human users, need to install operation stair and platform additional.
From 44.8 meters of smoke sampling platforms, 2 meters of installations, 45 ° of equal tees vertically downward
to boiler left and right sides inclined downward, use pipeline
be connected respectively in the first air preheater and the second air preheater air preheater exhaust pass, as shown in Fig. 12,3.Before access air preheater 2,3 exhaust pass, respectively install a stainless steel metal expansion joint DN100 additional, before entering flue, correct position respectively installs a hand stop valve (DN100, J41Y-64P) additional.
The sampler of fume emission gas provided by the present invention, by carrying out array sampled measurements to flue gas, the flue gas at diverse location place is pooled in female pipe and mixes, be directly connected on air preheater exhaust pass by surge tank again, utilize the pressure reduction that exhaust pass exports to air preheater, realize the circulation naturally that gas bypass is measured, and realize Homogeneous phase mixing by continuing flowing, this measurement bypass carries out flue gas multidraw again, mix to obtain, representative strong flue gas, can NO in Measurement accuracy flue gas
xconcentration, make desulphurization denitration export environmental protection parameter consistent, reliable and stable, the environmental protection state modulator guaranteeing that denitration regulates automatically and unit safety, stable, environmental protection run.
Compared with prior art, the present embodiment has the following advantages:
(1) select to carry out the sampling of array multiple spot non-blind area in stabilized zone, denitration exiting flue gas flow field, guarantee that flue gas mixes, make smoke sampling representative;
(2) the flue gas utilization denitration of outlet header is exported to the pressure reduction of air preheater outlet, set up smoke sampling and measure bypass, do not affecting under air and flue system resistance and other operating modes, realizing the circulation naturally that gas bypass is measured, and realizing Homogeneous phase mixing by continuing flowing.Between air preheater exhaust pass, surge tank is installed at outlet header, and sampling probe is installed on surge tank, thus make analysis air chamber obtain mixed uniformly flue gas.Simultaneous buffering tank and the multiple redundancy of the upper installation of the female pipe of measurement are popped one's head in, and can realize the online sampling and measuring accurately and reliably of flue gas.
(3) purging system is manually or automatically installed to sampling line and measurement bypass, ensure the normal work of measuring pipeline.In addition, have and purge Secure isolation loop and the measure of sampling Secure isolation, effectively prevent sampling test point in prior art and easily occur the problem that blocking, seepage etc. cause sampler to lose efficacy.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiment, between each embodiment same or similar part mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a sampler for fume emission gas, is characterized in that, comprising:
Multiple sampling pipe, female pipe, sampling platform, sampling probe, air preheater and analyser;
Wherein, each sampling pipe is respectively equipped with multiple sample tap; Described sampling pipe is connected with described female pipe respectively, and described female pipe has reduced diameter portion and second time reduced diameter portion for the first time at described sampling platform place, the center section for the first time after reducing and before the second reducing forms surge tank; Sample described in described female Guan Jing after platform and be connected with described air preheater, formed and measure bypass; It is inner that described sampling probe is positioned at described surge tank, and the signal output part of described sampling probe is connected with described analyser.
2. the sampler of fume emission gas as claimed in claim 1, it is characterized in that, described sampling pipe is eight, every root sampling pipe is provided with four sample taps, one end of described sampling pipe is in free expansion state, and the distance between flue is preset value, be positioned at stabilized zone, fume emission mouth flow field.
3. the sampler of fume emission gas as claimed in claim 2, is characterized in that, also comprise:
Angle bar and parallels; Described angle bar is positioned on described sampling pipe, and described parallels is positioned at the bottom of the free expansion end of described sampling pipe.
4. the sampler of the fume emission gas as described in any one of claims 1 to 3, is characterized in that, by equal tee after platform of sampling, is connected respectively with the exhaust pass of the first air preheater and the second air preheater described in described female Guan Jing.
5. the sampler of fume emission gas as claimed in claim 4, is characterized in that, also comprise:
First hand stop valve, between described sampling pipe and described female pipe.
6. the sampler of fume emission gas as claimed in claim 4, is characterized in that, also comprise:
Second hand stop valve, between described mother's pipe and described sampling platform.
7. the sampler of fume emission gas as claimed in claim 4, is characterized in that, also comprise:
3rd hand stop valve and the 4th hand stop valve, position before laying respectively at described female pipe first time reducing and after second time reducing.
8. the sampler of fume emission gas as claimed in claim 7, is characterized in that, also comprise:
Use mixedly air and purge pipeline, position before laying respectively at described 3rd hand stop valve and after the first hand stop valve.
9. the sampler of fume emission gas as claimed in claim 8, it is characterized in that, described sampling probe and pipeline adopt Flange joint, the consistent size of ring flange size and described sampling probe mounting flange.
10. the sampler of fume emission gas as claimed in claim 9, it is characterized in that, described analyser is denitration exiting flue gas analyser, and described sampling probe is connected with described denitration exiting flue gas analyser by heat tracing pipe.
Priority Applications (1)
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|---|---|---|---|
| CN201510226709.8A CN104792581A (en) | 2015-05-06 | 2015-05-06 | Sampling device for smoke discharge gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510226709.8A CN104792581A (en) | 2015-05-06 | 2015-05-06 | Sampling device for smoke discharge gas |
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Cited By (5)
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| CN105258985A (en) * | 2015-11-10 | 2016-01-20 | 贵州电网有限责任公司电力科学研究院 | SCR outlet flue fracture surface nitric oxide distribution monitoring device |
| CN105865860A (en) * | 2016-05-31 | 2016-08-17 | 邢红涛 | Flue gas detection device used for SCR (Selective Catalytic Reduction) denitration process |
| CN106345298A (en) * | 2016-10-14 | 2017-01-25 | 南京博沃科技发展有限公司 | SCR denitration device as well as ammonia spraying adjustment device and ammonia spraying adjustment method thereof |
| CN110132663A (en) * | 2019-04-29 | 2019-08-16 | 国网浙江省电力有限公司电力科学研究院 | A kind of smoke sampling auxiliary device suitable for high temperature positive flue |
| CN110967228A (en) * | 2019-12-25 | 2020-04-07 | 安徽皖仪科技股份有限公司 | Dynamic multi-point sampling device |
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| CN110967228A (en) * | 2019-12-25 | 2020-04-07 | 安徽皖仪科技股份有限公司 | Dynamic multi-point sampling device |
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Effective date of registration: 20151021 Address after: Hangzhou City, Zhejiang province 310014 eight District No. 1, Huadian Zhaohui Applicant after: Electric Power Research Institute of State Grid Zhejiang Electric Power Company Applicant after: State Grid Corporation of China Applicant after: Guohua Ning Power Co., Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: Electric Power Research Institute of State Grid Zhejiang Electric Power Company |
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Application publication date: 20150722 |