CN113567203A - Flue gas measuring device - Google Patents
Flue gas measuring device Download PDFInfo
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- CN113567203A CN113567203A CN202110853990.3A CN202110853990A CN113567203A CN 113567203 A CN113567203 A CN 113567203A CN 202110853990 A CN202110853990 A CN 202110853990A CN 113567203 A CN113567203 A CN 113567203A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 239000003546 flue gas Substances 0.000 title claims abstract description 99
- 238000005070 sampling Methods 0.000 claims abstract description 134
- 238000001816 cooling Methods 0.000 claims abstract description 77
- 238000010790 dilution Methods 0.000 claims abstract description 26
- 239000012895 dilution Substances 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 239000000523 sample Substances 0.000 claims description 24
- 239000000498 cooling water Substances 0.000 claims description 14
- 241000883990 Flabellum Species 0.000 claims description 13
- 239000000428 dust Substances 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000009833 condensation Methods 0.000 abstract description 4
- 230000005494 condensation Effects 0.000 abstract description 4
- 230000006911 nucleation Effects 0.000 abstract description 4
- 238000010899 nucleation Methods 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 239000003595 mist Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- 238000000151 deposition Methods 0.000 description 3
- 238000007865 diluting Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a flue gas measuring device which comprises a plurality of first sampling pipes distributed on the cross section of an outlet flue of a denitration device in a matrix manner, wherein a plurality of horn-shaped sampling holes are formed in each first sampling pipe at equal intervals, all the first sampling pipes are connected to a collecting pipe together, one end of the collecting pipe is connected with a flow equalizing pipe, the middle part of the flow equalizing pipe is connected with a sampling pipe, the sampling pipe is used for sampling flue gas in the flow equalizing pipe and then conveying the flue gas to a flue gas pretreatment system through the composite sampling pipe, the flow equalizing pipe is communicated with a turning chamber at an outlet of an air preheater through a return pipe, and a dilution cooler is further connected between the collecting pipe and the flow equalizing pipe. The dilution cooler can divide the flue gas into two parts, one part is firstly diluted after pre-cooling and then is further cooled, the cooled and diluted gas is fully stirred and mixed with the high-temperature flue gas in the heat tracing pipeline, and the influence on the measurement precision caused by cooling nucleation or water vapor condensation beading due to too low cooling temperature can be further prevented.
Description
Technical Field
The invention relates to the technical field of flue gas sampling detection, in particular to a flue gas measuring device.
Background
The CEMS flue gas on-line continuous monitoring system is a high and new technology product urgently needed in the national environmental protection field, and is mainly used for continuously on-line monitoring the emission concentration and the total emission amount of smoke dust, sulfur dioxide and nitrogen oxides in flue gas. There are two types of analysis techniques currently prevailing in the market, namely a direct analysis method and a decimation analysis method, and the decimation analysis method is divided into a complete decimation method and a dilution decimation method. A sampling probe can be used in an extraction type analysis method, the existing sampling probe is a single-point sampling probe, but the length of a straight pipeline at the outlet of an SCR denitration reactor is limited (the distance from the outlet of the SCR reactor to the inlet of an upper-level air preheater is less than 5 meters), smoke is insufficiently mixed in a large-section and small-straight-section flue which is easy to generate turbulence and turbulence, and a representative NOx content value cannot be measured by adopting conventional single-point sampling. Although a multipoint sampling mode is adopted in the market, the obtained effect is limited, the ammonia spraying amount exceeds the standard frequently, and the denitration system cannot be put into the denitration system automatically. In addition, the high-temperature flue gas needs to be cooled in the process of adopting a dilution extraction method, but the high-temperature flue gas can form condensed water in the cooling process, and soluble pollutants in the flue gas are condensed into water to influence the measurement result of the flue gas.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an object of the present invention is to provide a flue gas measuring apparatus that can prevent cooling nucleation or water vapor condensation beading due to too low cooling temperature from affecting the measurement accuracy.
The invention provides a flue gas measuring device, which comprises a plurality of first sampling pipes distributed on the cross section of an outlet flue of a denitration device in a matrix manner, wherein a plurality of horn-shaped sampling holes are formed in each first sampling pipe at equal intervals, all the first sampling pipes are connected to a collecting pipe together, one end of the collecting pipe is connected with a flow equalizing pipe, the middle part of the flow equalizing pipe is connected with a second sampling pipe, the second sampling pipe is used for sampling flue gas in the flow equalizing pipe and then conveying the flue gas to a flue gas pretreatment system through the composite sampling pipe, the flow equalizing pipe is communicated with a steering chamber at an outlet of an air preheater through a return pipe, and a dilution cooler is also connected between the collecting pipe and the flow equalizing pipe.
Preferably, the dilution cooler comprises a shell, a heat tracing pipeline concentric with the shell is installed in the shell through a fixed support, a flue gas pipeline is formed between the heat tracing pipeline and the shell, a vortex cooling device in a hollow vortex pipeline structure is arranged in the shell and located on the periphery of the heat tracing pipeline, a fixed plate is fixedly sleeved on the heat tracing pipeline, one end of the vortex cooling device is connected with the fixed plate, the other end of the vortex cooling device is connected with an inner cavity of the heat tracing pipeline, a water-cooling inlet cavity communicated with the vortex cooling device is formed in the flow equalizing pipeline, the water-cooling inlet cavity is arranged on one side of the vortex cooling device in the direction opposite to the flow direction of flue gas, a water-cooling outlet cavity is also formed in the shell and located on the periphery of the vortex cooling device, the vortex cooling device is connected with the water-cooling outlet cavity through a water outlet of the vortex cooling device, and a cooling water outlet pipeline communicated with the interior of the water-cooling outlet cavity is connected to the outer wall of the flow equalizing pipeline; the inside of flow equalizing pipe still installs the dilution pipeline that is linked together with flue gas pipeline, rotate on the heat tracing pipeline between vortex cooling device and the fixed plate and cup jointed first flabellum, dilute the inside inert gas of pipeline and the flue gas mixing flow direction first flabellum in the flue gas pipeline and blow to the intermediate layer passageway to vortex cooling device by first flabellum, the inside of flow equalizing pipe is located and forms the mist gas outlet between water-cooling export cavity and the vortex cooling device, the heat tracing pipeline rotates at its terminal department after passing the mist gas outlet and cup jointed the second flabellum.
Preferably, the first sampling tube is provided with five sampling holes, four sampling holes are arranged on each first sampling tube, the first sampling tube is fixedly installed in an inclined mode and is prevented from depositing dust, and a dust blocking filter screen is additionally installed at the outlet.
Preferably, the second sampling tube comprises a sampling sleeve communicated with the flow equalizing tube, the bottom end of the sampling sleeve is connected with a sampling probe box through a connecting flange, a sampling probe rod is arranged inside the sampling sleeve, the top of the sampling probe rod is connected with a first sampling filter core used for collecting flue gas inside the flow equalizing tube through a probe rod-filter core joint, and the bottom of the sampling probe rod is connected with a second sampling filter core arranged inside the sampling probe box.
Preferably, a sampling valve is mounted at a position, adjacent to the collecting pipe, on each first sampling pipe, a back-flushing valve is further connected to an output end, located at the sampling valve, of each first sampling pipe, and the first sampling pipes are connected with the air compression system through the back-flushing valves.
The beneficial effects of the invention are as follows: according to the invention, a plurality of sampling tubes are distributed in a matrix form at the vertical flue at the bottom outlet of the denitration device, so that the value measured by the flue gas is most representative, and the accuracy of the flue gas measurement value is further improved. Each sampling tube is connected with an external back-blowing system, and compressed air is used for blowing the sampling tubes in the whole grid system, so that the sampling tubes can be prevented from being blocked. The sampling tube that the matrix distributes gets into to flow equalizing pipe through diluting the cooler behind the extraction flue gas in, and wherein flow equalizing pipe can reduce the velocity of flow of flue gas to make the second sampling tube have sufficient time and gather the flue gas, avoid the too fast influence to the measuring result that causes of the flue gas velocity of flow. The dilution cooler can divide the flue gas into two parts, wherein one part of the flue gas keeps the original temperature and concentration of the flue gas, the other part of the flue gas is diluted after pre-cooling, then the temperature is further reduced, the gas after temperature reduction and dilution is fully stirred and mixed with the high-temperature flue gas in the heat tracing pipeline, and the influence on the measurement precision caused by cooling nucleation or water vapor condensation beads formed due to too low cooling temperature can be further prevented.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow chart of a flue gas measuring device according to the present invention;
FIG. 2 is a schematic view of the connection between the flow equalizing pipe and the first sampling pipe in the flue gas measuring device according to the present invention;
FIG. 3 is a schematic cross-sectional view taken at A-A of FIG. 2;
FIG. 4 is a schematic cross-sectional view taken at B-B of FIG. 2;
FIG. 5 is a schematic cross-sectional view taken at C-C of FIG. 2;
FIG. 6 is a schematic cross-sectional view taken at D-D of FIG. 2;
FIG. 7 is a schematic view of the connection between a sampling tube and a flow equalizing tube in the flue gas measuring device according to the present invention;
FIG. 8 is a schematic cross-sectional view of the first sampling cartridge of FIG. 7;
FIG. 9 is a schematic cross-sectional view of the flue gas filter element of FIG. 2;
FIG. 10 is a side view of a dilution cooler in a flue gas measurement device in accordance with the present invention;
FIG. 11 is a schematic axial cross-sectional view of a dilution cooler in the flue gas measurement apparatus according to the present invention;
FIG. 12 is a schematic view of a half-section of a dilution cooler according to the present invention;
fig. 13 is a schematic view of the scroll cooling apparatus of fig. 5 taken along a radial direction.
In the figure: 1. a flow equalizing pipe; 2. a collector pipe; 3. a first sampling tube; 4. a sampling hole; 5. a sampling valve; 6. a blowback valve; 7. a dilution cooler; 8. a sampling sleeve; 9. a sampling probe rod; 10. a probe-cartridge joint; 11. a first sampling filter element; 12. a connecting flange; 13. sampling a probe box; 14. a second sampling filter element; 15. a housing; 16. a flue gas duct; 17. a heat tracing pipeline; 18. a first fan blade; 19. a cooling water inlet pipe; 20. fixing a bracket; 21. water-cooling the inlet chamber; 22. a vortex cooling device; 23. a water cooled outlet chamber; 24. a cooling water outlet pipe; 25. a dilution conduit; 26. a second fan blade; 27. a water outlet of the vortex cooling device; 28. a fixing plate; 29. a mixed gas outlet; 30. a second sampling tube; 31. compounding a sampling tube; 32. a flue gas pretreatment system; 33. an air preheater outlet diversion chamber; 34. a smoke filter element.
The direction of the arrows shown in figure 1 is the direction of the flue gas flow.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The embodiment discloses a flue gas measuring device, which comprises a plurality of first sampling pipes 3 distributed on the cross section of an outlet flue of a denitration device in a matrix form, wherein a plurality of trumpet-shaped sampling holes 4 are formed in each first sampling pipe 3 at equal intervals, all the first sampling pipes 3 are connected to a collecting pipe 2 together, one end of the collecting pipe 2 is connected with a flow equalizing pipe 1, the middle part of the flow equalizing pipe 1 is connected with a second sampling pipe 30, and a flue gas filter core 34 is arranged at the connection part of the second sampling tube 30 and the flow equalizing tube 1, the flow equalizing tube 1 can reduce the flow rate for the sampling tube to extract gas, the second sampling tube samples the flue gas in the flow equalizing tube 1 and then conveys the sampled flue gas to a flue gas pretreatment system 32 through a composite sampling tube 31, the flow equalizing pipe 1 is communicated with the air preheater outlet steering chamber 33 through a return pipe, and a dilution cooler 7 used for diluting and cooling high-temperature flue gas is connected between the collecting pipe 2 and the flow equalizing pipe 1.
Specifically, as shown in fig. 4-7, the dilution cooler 7 includes a housing 15, a heat tracing pipe 17 concentric with the housing 15 is installed inside the housing 15 through a fixing bracket 20, a flue gas pipe 16 is formed between the heat tracing pipe 17 and the housing 15, high-temperature flue gas enters the dilution cooler 7 from the heat collecting pipe 2 and is divided into two air flows, one air flow enters the flue gas pipe 16, the other air flow enters the heat tracing pipe 17, a vortex cooling device 22 in a hollow vortex pipe structure is arranged at the periphery of the heat tracing pipe 17 inside the flow equalizing pipe 1, a fixing plate 28 is fixedly sleeved on the heat tracing pipe 17, one end of the vortex cooling device 22 is connected with the fixing plate 28, the other end is connected with the inner cavity of the flow equalizing pipe 1, a water-cooling inlet chamber 21 communicated with the vortex cooling device 22 is formed inside the flow equalizing pipe 1, the water-cooling inlet chamber 21 is arranged at one side of the vortex cooling device 22 in the direction opposite to the flue gas flow direction, cooling water enters the water-cooled inlet chamber 21 through the cooling water inlet conduit 19. The inside of the equal flow tube 1 is located at the periphery of the vortex cooling device 22 and is further formed with a water-cooling outlet cavity 23, the vortex cooling device 22 is connected with the water-cooling outlet cavity 23 through a vortex cooling device water outlet 27, the outer wall of the equal flow tube 1 is connected with a cooling water outlet pipeline 24 communicated with the inside of the water-cooling outlet cavity 23, cooling water fills the water-cooling inlet cavity 21 and then flows into the vortex cooling device 22, and when the vortex cooling device 22 is filled with the cooling water, the cooling water flows into the water-cooling outlet cavity 23 from the vortex cooling device water outlet 27 to cool high-temperature mixed flue gas, and finally flows out through the cooling water outlet pipeline 24.
The inside of the uniform flow pipe 1 is also provided with a dilution pipeline 25 communicated with the flue gas pipeline 16, the dilution pipeline 25 is connected with an external inert gas system, a heat tracing pipeline 17 between the vortex cooling device 22 and the fixed plate 28 is rotatably sleeved with a first fan blade 18, the inert gas inside the dilution pipeline 25 and the flue gas in the flue gas pipeline 16 are mixed and flow to the first fan blade 18 and are blown to an interlayer channel of the vortex cooling device 22 by the first fan blade 18, the vortex cooling device 22 and cooling water inside the water-cooling outlet chamber 23 are used for cooling the mixed high-temperature flue gas in the interlayer channel, the inside of the uniform flow pipe 1 is positioned between the water-cooling outlet chamber 23 and the vortex cooling device 22 to form a mixed gas outlet 29, the cooled mixed flue gas flows out from the mixed gas outlet 29 to the main pipeline, the heat tracing pipeline 17 is rotatably sleeved with a second fan blade 26 at the tail end after passing through the mixed gas outlet 29, the mixed flue gas after being cooled off is the heliciform turbulent flow state after being discharged from mixed gas outlet 29, second flabellum 26 can reduce the degree of turbulent flow and make its laminar flow, the mixed flue gas of being discharged from mixed gas outlet 29 impacts second flabellum 26 with the inside high temperature flue gas of heat tracing pipe 17 jointly, second flabellum 26 can be with the high temperature gas in the heat tracing pipe 17 fully stirring mixture with mixed gas at rotatory in-process, thereby can further prevent because the cooling temperature is crossed the cooling nucleation or the vapor condensation bead that forms influences measurement accuracy.
As a preferred embodiment, in the present embodiment, five first sampling pipes 3 are provided, four sampling holes 4 are arranged on each first sampling pipe 3, and the first sampling pipes 3 are installed in an inclined manner for preventing dust deposition, and a dust blocking filter screen is additionally installed at the outlet, so that each point at different positions is extracted at the smoke gas flow cross section, the more the number of extracted points is, the more representative the number of extracted points is, and the number of extracted points is determined according to the size of the cross section, because the cross section of the outlet flue is 4m × 5m, and the area is about 20 square meters, the length of the first sampling pipe 3 is 4m, the positions of the sampling holes 4 are 0.8m, 1.6m, 2.4m, and 3.2m, and the sampling holes are arranged according to an average of 1 sampling point per square meter, and meanwhile, the inclined manner of each first sampling pipe 3 can prevent dust deposition.
As shown in fig. 3, the second sampling tube 30 includes a sampling sleeve 8 communicated with the inside of the flow equalizing tube 1, the bottom end of the sampling sleeve 8 is connected with a sampling probe box 13 through a connecting flange 12, a sampling probe rod 9 is arranged inside the sampling sleeve 8, the top of the sampling probe rod 9 is connected with a first sampling filter core 11 used for collecting flue gas inside the flow equalizing tube 1 through a probe rod-filter core joint 10, and the bottom of the sampling probe rod 9 is connected with a second sampling filter core 14 arranged inside the sampling probe box 13.
In addition, sampling valve 5 is all installed to this application neighbouring collector pipe 2's position department on every first sampling tube 3, and the output that lies in sampling valve 5 on first sampling tube 3 still is connected with blowback valve 6 to first sampling tube 3 links to each other with air compression system through this blowback valve 6, and manual operation utilizes compressed air to sweep first sampling tube 3 among the whole grid system, prevents stifled grey, and during the anti-blow back, closes sampling valve 5, opens blowback valve 6.
The invention provides a smoke measuring device, which has the following working principle: the flue gas measuring device in the invention takes the flue gas pressure at the outlet of a denitration device and the flue gas differential pressure at the outlet of an air preheater turning chamber 33 as the power source of a sampling system, a first sampling pipe 3 which is distributed in a rectangular shape is arranged at a sampling point of a flue gas duct at the outlet of the denitration device to collect flue gas, when the flue gas is collected, a sampling valve 5 is opened, a back-flushing valve 6 is closed, the collected flue gas flows through the first sampling pipe 3, passes through a collecting pipe 2 and firstly enters a dilution cooler 7 to be cooled and diluted, as shown in figure 5, the flue gas flows from right to left in the dilution cooler 7 and is divided into two parts by a heat tracing pipeline 17, one part enters a heat tracing pipeline 17, the other part enters a flue gas pipeline 16, cooling water enters a water cooling water inlet pipeline 19 to a water-cooling chamber 21 to pre-cool the flue gas in the flue gas pipeline 16, and then enters a vortex cooling device 22, at this time, the inert gas also enters the flue gas pipeline 16 from the dilution pipeline 25 to dilute the flue gas, the diluted flue gas is blown to the first fan blade 18, the first fan blade 18 blows the mixed gas to the interlayer channel of the vortex cooling device 22, make the mist after diluting reduce the temperature under water-cooled effect, discharge to the trunk line through mist gas outlet 29 at last, from mist gas outlet 29 exhaust mixed flue gas and the inside high temperature flue gas of heat tracing pipeline 17 impact second flabellum 26 jointly, second flabellum 26 can be with the high temperature gas in the heat tracing pipeline 17 and the mist intensive mixing of mixing at rotatory in-process, the flue gas that mixed liquid stirring is even afterwards gets into the velocity of flow reduction in flow equalizing pipe 1, the second sampling tube samples the flue gas to in flow equalizing pipe 1, carry to among the flue gas pretreatment system 32 through compound sampling tube 31 after the sample.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (5)
1. Flue gas measuring device, a serial communication port, including being a plurality of first sampling tubes (3) that the matrix distributes on denitrification facility export flue cross section, on every first sampling tube (3) equipartition interval seted up sampling hole (4) that a plurality of loudspeaker describe, all first sampling tubes (3) are connected on collecting pipe (2) jointly, the one end of collecting pipe (2) is connected with flow equalizing pipe (1), the middle part of flow equalizing pipe (1) is connected with second sampling tube (30), second sampling tube (30) carry the flue gas sampling back of flow equalizing pipe (1) inside to flue gas pretreatment system (32) in through compound sampling tube (31), flow equalizing pipe (1) are linked together through back flow and air preheater export turn to room (33), still be connected with dilution cooler (7) between collecting pipe (2) and flow equalizing pipe (1).
2. The flue gas measuring device according to claim 1, wherein the dilution cooler (7) comprises a housing (15), a heat tracing pipe (17) concentric with the housing (15) is installed inside the housing (15) through a fixing bracket (20), a flue gas pipe (16) is formed between the heat tracing pipe (17) and the housing (15), a vortex cooling device (22) with a hollow vortex pipe structure is arranged inside the heat tracing pipe (17) and located on the periphery of the heat tracing pipe (17), a fixing plate (28) is fixedly sleeved on the heat tracing pipe (17), one end of the vortex cooling device (22) is connected with the fixing plate (28), the other end of the vortex cooling device is connected with an inner cavity of the heat tracing pipe (1), a water cooling inlet chamber (21) communicated with the vortex cooling device (22) is formed inside the heat tracing pipe (1), the water cooling inlet chamber (21) is arranged on one side of the vortex cooling device (22) along the direction opposite to the flow direction of the flue gas, a water-cooling outlet chamber (23) is formed in the uniform flow pipe (1) and is positioned at the periphery of the vortex cooling device (22), the vortex cooling device (22) is connected with the water-cooling outlet chamber (23) through a water outlet (27) of the vortex cooling device, and a cooling water outlet pipeline (24) communicated with the inside of the water-cooling outlet chamber (23) is connected to the outer wall of the uniform flow pipe (1); the inside of flow equalizing pipe (1) still installs dilution pipeline (25) that are linked together with flue gas pipeline (16), rotate on heat tracing pipeline (17) between vortex cooling device (22) and fixed plate (28) and cup joint first flabellum (18), dilute inside inert gas of pipeline (25) and the flue gas in flue gas pipeline (16) and mix and flow to first flabellum (18) and be blown to in the intermediate layer passageway to vortex cooling device (22) by first flabellum (18), the inside of flow equalizing pipe (1) is located and forms mixed gas outlet (29) between water-cooling export chamber (23) and vortex cooling device (22), heat tracing pipeline (17) are rotated after passing mixed gas outlet (29) and are cup jointed second flabellum (26) at its terminal department.
3. The flue gas measuring device according to claim 2, wherein the first sampling pipes (3) are provided with five sampling holes, four sampling holes (4) are arranged on each first sampling pipe (3), the first sampling pipes (3) are fixedly installed in an inclined manner to prevent dust deposition, and a dust-blocking filter screen is additionally installed at the outlet.
4. The flue gas measuring device of claim 1, wherein the second sampling tube (30) comprises a sampling sleeve (8) communicated with the inside of the flow equalizing tube (1), the bottom end of the sampling sleeve (8) is connected with a sampling probe box (13) through a connecting flange (12), a sampling probe rod (9) is arranged inside the sampling sleeve (8), the top of the sampling probe rod (9) is connected with a first sampling filter element (11) for collecting flue gas inside the flow equalizing tube (1) through a probe rod-filter element joint (10), and the bottom of the sampling probe rod (9) is connected with a second sampling filter element (14) arranged inside the sampling probe box (13).
5. The flue gas measuring device according to claim 1, wherein each first sampling pipe (3) is provided with a sampling valve (5) at a position adjacent to the collecting pipe (2), the output end of the sampling valve (5) on the first sampling pipe (3) is further connected with a back-flushing valve (6), and the first sampling pipe (3) is connected with an air compression system through the back-flushing valve (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110853990.3A CN113567203B (en) | 2021-07-28 | 2021-07-28 | Flue gas measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110853990.3A CN113567203B (en) | 2021-07-28 | 2021-07-28 | Flue gas measuring device |
Publications (2)
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| CN113567203B (en) | 2024-03-05 |
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