CN110018092B - Gas boiler flue gas particulate matter detection device - Google Patents
Gas boiler flue gas particulate matter detection device Download PDFInfo
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- CN110018092B CN110018092B CN201810017343.7A CN201810017343A CN110018092B CN 110018092 B CN110018092 B CN 110018092B CN 201810017343 A CN201810017343 A CN 201810017343A CN 110018092 B CN110018092 B CN 110018092B
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- flue gas
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- particulate matter
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000003546 flue gas Substances 0.000 title claims abstract description 60
- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 239000007789 gas Substances 0.000 title claims abstract description 20
- 239000013618 particulate matter Substances 0.000 title claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000010926 purge Methods 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims 2
- 239000000779 smoke Substances 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000004140 cleaning Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 239000000428 dust Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a gas boiler flue gas particulate matter detection device, which comprises: the particle detection mechanism comprises a light source and a photoelectric detector which are respectively and oppositely arranged on two sides of a flue of the flue gas exhaust pipe; the flue gas dewatering mechanism comprises a top cover, an inner wall and a baffle; the flue gas heating mechanism comprises a heating sleeve which is arranged above the flue gas dewatering mechanism and wrapped on the flue gas exhaust pipe. The device has the characteristics of simple structure, strong reliability, strong anti-interference performance and the like. After the smoke passes through the smoke dewatering mechanism, most of condensed water in the smoke can be removed, the effect of stabilizing the flow speed is achieved, the detection is guaranteed to be carried out under a certain constant pressure and constant flow state, and the probability of error occurrence is reduced. The detection area is heated, so that the generation of condensed water in detection is avoided, and meanwhile, the detection precision is improved by cleaning the mirror surface of the photoelectric detector through the purging mechanism.
Description
Technical Field
The invention relates to a smoke detection technology, in particular to a smoke particle detection device for a gas boiler.
Background
Energy sources required in industrial production, such as electric energy, thermal energy, etc., mainly come from energy released by combustion of fuel. Among them, the atmospheric pollution caused by fuel combustion is the most serious pollution caused by the particles in the flue gas discharged from the chimney. The smoke emitted after the combustion of these fuels is a major fixed pollution source causing damage to the quality of the atmospheric environment.
The 35-ton gas-fired boiler of a certain iron and steel enterprise purifies the discharged flue gas according to the national requirements, and detects the treatment result in real time while discharging so as to supervise and control the discharge of pollutants. However, in the actual detection process, because the exhaust gas temperature of the gas boiler is between 85 and 95 ℃, the exhaust gas also contains about 20 percent of moisture, and the exhaust gas is easy to be cooled in the pipeline to form a liquid drop state reaching saturated humidity and low temperature. In this state, measurement errors of fine particulate matter are easily generated due to condensation of moisture. Meanwhile, the flow rate of the flue gas in the flue is unstable, and the accuracy of the detected data is greatly influenced.
Table 1 shows a method for measuring the amount or relative mass concentration of particulate matter in the prior art, in which a membrane weighing method, although having a strong ability of resisting external factors, requires a long sampling time, is difficult to be applied to a situation requiring a rapid measurement result, cannot realize online monitoring, and the measurement result is an average value over a period of time, and is also complicated to operate. In comparison, although some errors exist in other concentration measurement methods, the other concentration measurement methods have an automatic online continuous detection mode and are more suitable for real-time detection of smoke particles. But these methods also have certain defects, are greatly influenced by factors such as flue gas humidity, flow velocity and the like in particulate matter detection, and cannot be applied to the measurement field.
TABLE 1 comparison of common particulate matter concentration detection methods
Disclosure of Invention
The invention aims to overcome the defects and provide the gas boiler flue gas particulate matter detection device which can eliminate moisture interference in flue gas in a flue of a gas boiler, stabilize the flow rate of the flue gas and accurately and continuously detect pollutant emission.
In order to achieve the above object, the present invention adopts the following technical solutions.
The utility model provides a gas boiler flue gas particulate matter detection device, locates on the flue gas exhaust pipe, includes:
the particle detection mechanism comprises a light source and a photoelectric detector which are respectively and oppositely arranged on two sides of a flue of the flue gas exhaust pipe;
the flue gas dewatering mechanism comprises a cylinder body, a top cover and centrifugal baffles, wherein the upper end and the lower end of the cylinder body are respectively provided with an air inlet and an air outlet which are connected with a flue gas exhaust pipe, the centrifugal baffles are positioned in the cylinder body and are arranged along the tail end of the air inlet in a circle, and the upper ends of the centrifugal baffles are sealed by the top cover;
the flue gas heating mechanism comprises a heating sleeve which is arranged above the flue gas dewatering mechanism and wrapped on the flue gas exhaust pipe.
The heating sleeve pipe on be equipped with intake pipe and drain pipe, be equipped with the admission valve in the intake pipe, be equipped with the trap on the drain pipe.
The device also comprises a purging mechanism which comprises a purging pipe and a spray head arranged at the front end of the photoelectric detector.
The spray head is provided with a strip-shaped air curtain hole.
One end of the purging pipe is connected to the compressed air pipe, and the compressed air pipe is further provided with an electromagnetic valve and a pneumatic triple piece.
In the technical scheme of the invention, the gas boiler smoke particulate matter detection device has the following advantages:
1. simple structure, strong reliability, strong anti-interference performance and the like.
2. After the smoke passes through the smoke dewatering mechanism, most of condensed water in the smoke can be removed, the effect of stabilizing the flow speed is achieved, the detection is guaranteed to be carried out under a certain constant pressure and constant flow state, and the probability of error occurrence is reduced.
3. The detection area is heated, so that the generation of condensed water in detection is avoided, and meanwhile, the detection precision is improved by cleaning the mirror surface of the photoelectric detector through the purging mechanism.
Drawings
FIG. 1 is a schematic view of the detecting device for detecting particulate matters in flue gas of a gas boiler according to the present invention;
FIG. 2 is a cross-sectional view of the flue gas water removal mechanism of the present invention;
FIG. 3 is a top view of the flue gas water removal mechanism of the present invention;
fig. 4 is a schematic structural view of the head of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
At present, a light transmission method is mainly utilized for particle detection, the light transmission method is mainly based on the measurement principle of an extinction law, after a beam of monochromatic light enters the surface of a certain absorbing medium, a part of light energy is absorbed when the monochromatic light passes through a medium with a certain thickness, the intensity of the light is inevitably weakened, and when the concentration and the thickness of the absorbing medium are larger, the weakening of the light intensity is more obvious. The concentration of the dust-containing area is judged according to the attenuation condition of light passing through the dust-containing area, the method has a simple structure and a continuous detection function, but has poor anti-interference capability, is easily influenced by moisture and flow velocity in flue gas, and must be provided with necessary auxiliary devices to ensure the detection precision.
Based on the principle of light transmission method, the invention designs a gas boiler flue gas particulate matter detection device with water removal and flow stabilization functions, as shown in fig. 1, the whole device is arranged on a flue gas exhaust pipe 1 and mainly comprises a particulate matter detection mechanism, a flue gas water removal mechanism 13 and a flue gas heating mechanism, wherein the particulate matter detection mechanism comprises a light source 2 and a photoelectric detector 10 which are respectively and oppositely arranged at two sides of a flue of the flue gas exhaust pipe 1. On the same axis, when the light source 2 emits light rays, the light rays pass through the whole flue and directly irradiate the photoelectric detector 10, and because the light rays are attenuated to some extent through the dust-containing area, the photoelectric detector 10 converts received light signals into electric signals convenient for comparison, and transmits the electric signals to the database and the processing module, and the magnitude of a comparison attenuation value is analyzed, so that the content of particles in the flue gas is obtained.
Referring to fig. 2 and 3, the flue gas dewatering mechanism 13 includes a flue gas barrel 20, a top cover 21 and centrifugal baffles 22, the upper and lower ends of the barrel 20 are respectively provided with an air inlet 23 and an air outlet 24 connected with the flue gas exhaust pipe 1, the centrifugal baffles 22 are positioned in the barrel 20 and arranged along the end of the air inlet 23, the upper end of the centrifugal baffles 22 is sealed by the top cover 21, the air inlet 23 and the air outlet 24, the barrel 20, the centrifugal baffles 22 and the top cover 21 are coaxially arranged, when the flue gas enters the flue gas dewatering mechanism 13 from bottom to top, due to the blocking of the top cover 21, the flue gas passes through gaps between the centrifugal baffles 22 on the periphery, and the curved shape of the centrifugal baffles 22 makes the flue gas generate a rotational motion, droplets in the flue gas rotate with the air flow under the action of viscous force, and then the droplets are thrown to the inner wall of the barrel 20 under the action of the centrifugal force, so as to be separated, and the flue gas can continue to go upwards, get into the detection area that heats through air outlet 23, at this moment, because receive the resistance, the flue gas air current also becomes relatively steady, and the velocity of flow is invariable.
Flue gas heating mechanism is including locating 13 tops of flue gas dewatering mechanism and wrapping up heating sleeve 3 on flue gas exhaust pipe 1, as an embodiment, heating sleeve 3 on be equipped with intake pipe 4 and drain pipe 11, be equipped with admission valve 5 on the intake pipe 4, be equipped with trap 12 on the drain pipe 11, through input steam to ensure steam flow, thereby continuously heat, make detection area temperature be higher than the flue gas temperature, in order to ensure the drying of flue gas, reduce the content of its moisture, ensure to detect the precision.
As shown in fig. 4, since the surface smoothness of the photodetector 10 is important, if the surface is contaminated by dust, the detection result will be affected to some extent. The gas boiler flue gas particulate matter detection device also comprises a purging mechanism which is arranged at the front end of the photoelectric detector 10 and does not influence the light irradiation position, the purging mechanism comprises a purging pipe 8 and a spray head 9, and the spray head 9 is provided with a long gas curtain hole 25 to ensure that purging gas can be uniformly and effectively sprayed onto the surface of the photoelectric detector 10 to remove dust. One end of the purging pipe 8 is connected to an external compressed air pipe for providing clean compressed air, the compressed air pipe is also provided with an electromagnetic valve 7 and a pneumatic triple piece 6, and the compressed air pressure is adjusted to be between 0.1 and 0.2Mpa through the pneumatic triple piece 6; the compressed air injection frequency is set to be 5-15 times/min through the electromagnetic valve 7, and the injection time is set to be 2-6 seconds/time.
In conclusion, the gas boiler flue gas particulate matter detection device with the water removal and flow stabilization functions can enable the online monitoring of the emission of the flue gas particulate matter to accurately detect whether the emission of the pollution source meets the current national emission standard; the performance of the dust removal purification device and the pollution prevention and control facility can be correctly evaluated, and the running condition of the antifouling facility can be monitored; and scientific and accurate basis is provided for environmental quality management and evaluation.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (2)
1. The utility model provides a gas boiler flue gas particulate matter detection device which characterized in that, locates on the flue gas exhaust pipe, includes:
the particle detection mechanism comprises a light source and a photoelectric detector which are respectively and oppositely arranged on two sides of a flue of the flue gas exhaust pipe;
the flue gas dewatering mechanism comprises a cylinder body, a top cover and centrifugal baffles, wherein the upper end and the lower end of the cylinder body are respectively provided with an air inlet and an air outlet which are connected with a flue gas exhaust pipe, the centrifugal baffles are positioned in the cylinder body and are arranged along the tail end of the air inlet in a circle, and the upper ends of the centrifugal baffles are sealed by the top cover; the air inlet, the air outlet, the cylinder body, the centrifugal baffle and the top cover are coaxially arranged;
the flue gas heating mechanism comprises a heating sleeve which is arranged above the flue gas dewatering mechanism and is wrapped on the flue gas exhaust pipe,
also comprises a blowing mechanism which comprises a blowing pipe and a spray head arranged at the front end of the photoelectric detector,
the nozzle is provided with a strip-shaped air curtain hole,
one end of the purging pipe is connected to a compressed air pipe, the compressed air pipe is also provided with an electromagnetic valve and a pneumatic triple piece,
the centrifugal baffle is substantially vertical.
2. The gas boiler flue gas particulate matter detection device of claim 1, wherein: the heating sleeve pipe on be equipped with intake pipe and drain pipe, be equipped with the admission valve in the intake pipe, be equipped with the trap on the drain pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810017343.7A CN110018092B (en) | 2018-01-09 | 2018-01-09 | Gas boiler flue gas particulate matter detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810017343.7A CN110018092B (en) | 2018-01-09 | 2018-01-09 | Gas boiler flue gas particulate matter detection device |
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| Publication Number | Publication Date |
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| CN110018092A CN110018092A (en) | 2019-07-16 |
| CN110018092B true CN110018092B (en) | 2022-02-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI130248B (en) * | 2019-09-23 | 2023-05-08 | Valmet Automation Oy | Measurement apparatus and method of paper web |
| CN110732225A (en) * | 2019-11-12 | 2020-01-31 | 福州大学 | Flue water removal device and water removal method |
| CN111208045B (en) * | 2020-04-17 | 2020-07-14 | 湖南九九智能环保股份有限公司 | Self-cleaning dust sensing system |
| CN114324098B (en) * | 2022-03-10 | 2022-05-24 | 南京波瑞自动化科技有限公司 | Double-light-path laser forward scattering particulate matter concentration measuring device |
| CN116380741B (en) * | 2023-06-05 | 2023-08-25 | 湖北圣信特种设备检测有限公司 | Device and method for detecting components of combustion flue gas of boiler |
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| US3809913A (en) * | 1972-10-20 | 1974-05-07 | Steel Corp | Detector for particulate matter in flowing gas streams |
| GB1505527A (en) * | 1974-05-21 | 1978-03-30 | Snam Progetti | Smoke density measuring apparatus |
| US4883972A (en) * | 1987-05-13 | 1989-11-28 | Combustion Developments Limited | Monitoring equipment for detection of emission |
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2018
- 2018-01-09 CN CN201810017343.7A patent/CN110018092B/en active Active
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| GB1505527A (en) * | 1974-05-21 | 1978-03-30 | Snam Progetti | Smoke density measuring apparatus |
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