CN118243462B - Nitrogen oxide monitoring instrument suitable for complex environment - Google Patents
Nitrogen oxide monitoring instrument suitable for complex environment Download PDFInfo
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- CN118243462B CN118243462B CN202410668041.1A CN202410668041A CN118243462B CN 118243462 B CN118243462 B CN 118243462B CN 202410668041 A CN202410668041 A CN 202410668041A CN 118243462 B CN118243462 B CN 118243462B
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 135
- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000005070 sampling Methods 0.000 claims abstract description 138
- 239000004744 fabric Substances 0.000 claims abstract description 54
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000000779 smoke Substances 0.000 claims description 96
- 230000000087 stabilizing effect Effects 0.000 claims description 21
- 230000000712 assembly Effects 0.000 claims description 5
- 238000000429 assembly Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 26
- 239000003546 flue gas Substances 0.000 abstract description 26
- 238000000605 extraction Methods 0.000 abstract description 11
- 241000208125 Nicotiana Species 0.000 abstract description 5
- 235000002637 Nicotiana tabacum Nutrition 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- 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
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
-
- 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
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
-
- 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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/26—Devices for withdrawing samples in the gaseous state with provision for intake from several spaces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
-
- 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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to the field of nitrogen oxide monitoring, in particular to a nitrogen oxide monitoring instrument suitable for a complex environment, which comprises a mounting ring, a sampling mechanism and a detection mechanism; the sampling mechanism comprises a rotary drum, a sampling assembly and a driving assembly; when carrying out nitrogen oxide monitoring, detection mechanism drives suction intracavity and produces the negative pressure, and through a plurality of sampling components, carries out the extraction to the different positions department in the tobacco pipe for flue gas in the tobacco pipe gathers in the extraction chamber, with the nitrogen oxide detection to suction intracavity gas, avoids single-point to gather and makes the monitoring inaccurate. The sampling tube rotates and installs on the rotary drum, and the outside cover has the filter cloth bag of flexible material for the filter cloth bag can swing along with the flue gas air current, adapts to the flow of the flue gas in the tobacco pipe better, weakens the disturbance to the flue gas, and drive assembly drives the rotary drum and drives the sampling assembly rotation, makes the sample of sampling tube extraction more even, thereby makes the monitoring result more objective accurate.
Description
Technical Field
The invention relates to the field of nitrogen oxide monitoring, in particular to a nitrogen oxide monitoring instrument suitable for a complex environment.
Background
Sampling and detecting the gas suction pattern is a common method of monitoring the nitrogen oxides in the gas. When the high-temperature flue gas in the boiler and other types of high-temperature gas processed by the denitration device are detected, in order to avoid the detector from being damaged by high temperature, part of the gas is usually sucked and sampled to an external detection instrument for detection.
Among the present nitrogen oxide monitoring facilities, like the chinese patent of bulletin number CN114544274B, the name is nitrogen oxide collection device for cement manufacture, public technical scheme records, gather tube shell and flue intercommunication, and be the acute angle with the flue axis, be provided with the sheath in the collection tube shell coaxially, the other end that sheath one end and the other end that gathers tube shell rotate and be connected extends to in the flue towards the one side that is close to the flue, but gather the single-point to the sample in this scheme, and because the setting of sheath, the gas flow in the lead to the flue receives the interference of certain degree and causes the flow of gas unstable, thereby lead to the gas sample of extraction inaccurate, lead to the inaccuracy of the detection value of nitrogen oxide concentration in the instrumentation to gas.
Disclosure of Invention
The invention provides a nitrogen oxide monitoring instrument suitable for complex environments, so as to solve the problems.
The nitrogen oxide monitoring instrument suitable for the complex environment adopts the following technical scheme: a nitrogen oxide monitoring instrument suitable for complex environments comprises a mounting ring, a sampling mechanism and a detection mechanism;
The mounting ring is arranged between two adjacent smoke pipes with vertical axes and coaxially arranged; the mounting ring is coaxial with the smoke tube; the flow direction of the smoke in the smoke tube is from bottom to top; the upper end and the lower end of the mounting ring are fixedly connected with the corresponding smoke tube; the side wall of the mounting ring, which faces the axis of the smoke tube, is provided with an annular suction groove; the suction groove and the mounting ring are coaxially arranged;
The sampling mechanism comprises a rotary drum, a sampling assembly and a driving assembly; the rotary drum is rotationally arranged in the suction groove along the circumferential direction of the smoke tube; the rotary drum surrounds the suction groove into a suction cavity; the sampling assemblies are arranged in a plurality of ways and uniformly distributed along the circumferential direction of the smoke tube; the sampling component is arranged on the side wall of the rotary drum, which is close to the axis of the smoke tube; the sampling assembly comprises a sampling tube and a filter cloth bag; the sampling tube is arranged in an up-down inclined way; the upper end of the sampling tube is close to the axis of the smoke tube, and the lower end of the sampling tube is far away from the axis of the smoke tube; the projection of the sampling tube on the horizontal plane is radially arranged along the smoke tube; the lower end of the sampling tube is rotatably arranged on the rotary drum around a rotary shaft which is horizontally arranged; the side wall of the sampling tube is provided with a sampling hole; the lower end of the sampling tube is fixedly connected with a corrugated tube; the lower end of the corrugated pipe passes through the rotary drum and is inserted into the suction cavity so as to enable the suction cavity to be communicated with the smoke pipe; a support frame is fixed on the sampling tube; the filter cloth bag is in a long cylinder shape with a bag opening facing the rotary drum, and is sleeved on the sampling tube through the supporting frame; the filter cloth bag is made of flexible materials; the driving component is used for driving the rotary drum to rotate around the axis of the smoke tube so as to make the samples extracted by the sampling tube more uniform;
The detection mechanism is used for driving the suction cavity to generate negative pressure, so that smoke in the smoke tube is filtered by the filter cloth bag, enters the suction cavity through the sampling tube and the corrugated tube, and detects the gas in the suction cavity.
Further, the section of the suction groove is in a U shape with an opening facing the axis of the smoke tube and arranged obliquely upwards; the rotary drum is in a funnel shape with the small end facing downwards; a rotation assembly is arranged between the rotary drum and the mounting ring; the rotation assembly is used for driving the filter cloth bag to rotate around the axis of the sampling tube when the driving assembly drives the rotary drum to drive the sampling assembly to revolve around the axis of the smoke tube. So that the suction part corresponding to the sampling hole on the sampling tube is always updated and changed, and the blockage caused by long-term suction and filtration at the position corresponding to the filter cloth bag is avoided.
Further, the autorotation assembly comprises a connecting cylinder; the connecting cylinder is arranged at one side of the filter cloth bag close to the rotary cylinder; the connecting cylinder is arranged in an up-down inclined way and sleeved on the outer side of the sampling tube; the upper end of the connecting cylinder is fixedly connected with the mouth of the filter cloth bag; the lower end is rotatably arranged at one side of the rotary drum, which is close to the axis of the smoke tube;
A self-rotating wheel and a self-rotating toothed ring are arranged between the connecting cylinder and the groove wall of the suction groove; the autorotation toothed ring is coaxially fixed on the groove wall at the upper side of the suction groove; the self-rotating wheel is coaxially fixed on the outer side wall of the connecting cylinder; the self-rotating wheel is meshed with the self-rotating toothed ring. When the driving component drives the rotary drum to rotate around the axis of the smoke tube, the self-rotation toothed ring drives the self-rotation wheel to drive the connecting drum to rotate, and the connecting drum drives the filter cloth bag to rotate around the axis of the sampling tube, so that the suction position corresponding to the sampling hole on the sampling tube is always updated and changed, and the problem that the position corresponding to the filter cloth bag is blocked due to long-term suction and filtration and the sampling effect is influenced is avoided.
Further, two groups of sampling holes are arranged, and the two groups of sampling holes are symmetrically arranged at two sides of the sampling tube relative to the vertical surface where the axis of the sampling tube is positioned; the sampling holes are uniformly distributed along the axis of the sampling tube. In the process of extracting the flue gas, because the filter cloth bag produces the vortex to the flue gas for the concentration of the nitrogen oxide of the flue gas of filter cloth bag below can become bigger than normal flow time-varying, and the concentration of the nitrogen oxide in the flue gas of filter cloth bag top can become smaller than normal flow time-varying, then establish the sampling hole in sampling tube both sides, the comparatively close flue gas of nitrogen oxide concentration of the flue gas of extraction filter cloth bag both sides, make in the extraction process, reduce the great influence of the flue gas concentration deviation of extraction that produces the disturbance and cause to the flue gas because of the filter cloth bag, increase the degree of accuracy of monitoring.
Further, the driving assembly comprises a driving motor and a driving toothed ring; the driving toothed ring is coaxially fixed at the upper end of the rotary drum; the groove wall on the upper side of the suction groove is provided with a matching groove; the matching groove is a through groove; the driving motor is fixed on the outer side wall of the mounting ring; a driving wheel is fixed on the output shaft of the driving motor; the driving wheel is meshed with the driving toothed ring through the matching groove for transmission.
Further, a stabilizing cylinder is arranged on one side of the rotary cylinder, which is close to the axis of the smoke tube; the groove wall of the suction groove, which is close to the upper end of the rotary drum, is provided with an annular chute; the stabilizing cylinder and the rotating cylinder are coaxially arranged; the stabilizing cylinder is funnel-shaped with the small end facing downwards, and the conicity of the stabilizing cylinder is the same as that of the rotating cylinder; the lower end of the stabilizing cylinder is fixedly connected with the rotating cylinder, and the upper end of the stabilizing cylinder is in running fit with the groove wall of the suction groove through the sliding groove. The stabilizing cylinder is used for separating the smoke and the autorotation assembly and simultaneously enabling the rotating cylinder to rotate more stably.
Further, the support frame comprises an arc-shaped support plate; the supporting plate is fixed on the outer side wall of the sampling tube; the supporting plate is arranged on one side of the rotating shaft, which is close to the axis of the smoke tube; two supporting rods are symmetrically arranged on the supporting plate; the stay bar is arranged along the axis direction of the sampling tube; the supporting rod is arranged at one side of the supporting plate, which is close to the axis of the smoke tube; one end of the stay bar, which is far away from the axis of the smoke tube, is fixed on the support plate; the filter cloth bag is sleeved outside the supporting rod and the supporting plate.
Further, the support plate is elliptical; the minor axis of backup pad level sets up, and the major axis sets up with inclination from top to bottom. The filter cloth bag is used for supporting the filter cloth bag to be oval with the horizontal section of which the long axis is arranged along the radial direction of the smoke tube, so that disturbance to smoke in the smoke tube is reduced, and the accuracy of extracting samples is improved.
Further, the detection mechanism includes a housing; the shell is fixed on the smoke tube and is positioned below the mounting ring; a sensor for monitoring the concentration of nitrogen oxides is arranged in the shell; the upper end of the shell is connected with an air inlet pipe; the air inlet pipe is fixed on the mounting ring and is communicated with the suction cavity; the lower end of the shell is connected with an exhaust pipe; the exhaust pipe is fixedly connected and communicated with the smoke pipe; and the air inlet pipe and the air outlet pipe are respectively provided with an air pump so as to suck the air in the suction cavity to the sensor in the shell and discharge the air in the shell into the smoke pipe.
Further, a static mixer is arranged in the air inlet pipe. The device is used for mixing samples extracted by the sampling assemblies before entering the shell for detection, so that the detection precision is improved, and the influence of differences of nitrogen oxide concentrations at different positions on detection results is reduced.
The beneficial effects of the invention are as follows:
1. When carrying out nitrogen oxide monitoring, detection mechanism drives suction intracavity and produces the negative pressure, and through a plurality of sampling components, draws different positions department in to the tobacco pipe for flue gas in the tobacco pipe is filtered by the filter cloth bag, and makes everywhere sample assemble in the suction chamber through sampling tube, bellows, in order to carry out nitrogen oxide to suction intracavity gas and detect, avoids single-point collection and makes the monitoring inaccurate.
2. The sampling tube is rotatably arranged on the rotary drum around the rotating shaft which is horizontally arranged, and the outer side of the sampling tube is sleeved with the filter cloth bag made of flexible materials, so that the filter cloth bag can swing along with the flue gas flow, the flow of flue gas in the flue tube can be better adapted, the disturbance to the flue gas can be weakened to a certain extent, and the sampling precision is improved.
3. When sampling, the driving component drives the rotary drum to drive the sampling component to rotate, so that the samples extracted by the sampling tube are more uniform, and the monitoring result is more objective and accurate.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of a nitrogen oxide monitor suitable for use in a complex environment according to the present invention;
FIG. 2 is a cross-sectional view of an embodiment of a nitrogen oxide monitor suitable for use in a complex environment in accordance with the present invention;
FIG. 3 is an enlarged view of FIG. 2 at A;
FIG. 4 is an enlarged view at B in FIG. 3;
FIG. 5 is a schematic illustration of a rotor and stabilizing drum of an embodiment of a nitrogen oxide monitor suitable for use in complex environments in accordance with the present invention;
FIG. 6 is a schematic diagram of a sampling tube, support frame and filter bag of an embodiment of a nitrogen oxide monitor suitable for use in complex environments of the present invention;
FIG. 7 is a cross-sectional view of a sampling tube, support frame and filter bag of an embodiment of a nitrogen oxide monitor suitable for use in complex environments of the present invention;
FIG. 8 is a schematic view of a sampling tube, support frame and bellows of an embodiment of a nitrogen oxide monitor suitable for use in complex environments of the present invention;
Fig. 9 is a schematic view of a mounting ring, suction slot and autorotation toothed ring of an embodiment of a nitrogen oxide monitor suitable for use in a complex environment in accordance with the present invention.
In the figure: 100. a smoke tube; 200. a mounting ring; 210. a suction groove; 300. a sampling mechanism; 310. a rotating drum; 311. a stabilizing cylinder; 320. a sampling assembly; 321. a sampling tube; 322. a sampling hole; 323. a bellows; 324. a filter cloth bag; 330. a support frame; 331. a support plate; 332. a brace rod; 341. a driving motor; 342. driving the toothed ring; 350. a self-rotation assembly; 351. a connecting cylinder; 352. a self-rotating wheel; 353. a self-rotating toothed ring; 400. a detection mechanism; 410. an air inlet pipe; 420. and an exhaust pipe.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the like or similar elements throughout or elements having the same or similar functions. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The features of the invention "first", "second" and the like in the description and in the claims may be used for the explicit or implicit inclusion of one or more such features. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
An embodiment of a nitrogen oxide monitoring instrument suitable for a complex environment according to the present invention is shown in fig. 1 to 9: a nitrogen oxide monitoring instrument suitable for complex environments, which comprises a mounting ring 200, a sampling mechanism 300 and a detection mechanism 400; the mounting ring 200 is arranged between two adjacent smoke pipes 100 with vertical axes and coaxially arranged; the mounting ring 200 is coaxial with the smoke tube 100; the flow direction of the smoke in the smoke tube 100 is from bottom to top; the upper end and the lower end of the mounting ring 200 are fixedly connected with the corresponding smoke tube 100; the side wall of the mounting ring 200 facing the axis of the smoke tube 100 is provided with an annular suction groove 210; the section of the suction groove 210 is in a U shape with an opening facing the axis of the smoke tube 100 and being arranged obliquely upwards; the suction groove 210 and the mounting ring 200 are coaxially disposed.
Sampling mechanism 300 includes a drum 310, a sampling assembly 320, and a drive assembly; drum 310 is funnel-shaped with the small end facing downward; the rotary drum 310 is rotatably installed in the suction groove 210 along the circumferential direction of the smoke pipe 100; the drum 310 encloses the suction slot 210 into a suction cavity; the sampling components 320 are arranged in a plurality and uniformly distributed along the circumferential direction of the smoke tube 100; the sampling assembly 320 is disposed on the sidewall of the drum 310 near the axis of the smoke tube 100.
The sampling assembly 320 comprises a sampling tube 321 and a filter cloth bag 324; the sampling tube 321 is arranged obliquely up and down; the upper end of the sampling tube 321 is close to the axis of the smoke tube 100, and the lower end is far away from the axis of the smoke tube 100; the projection of the sampling tube 321 on the horizontal plane is arranged along the radial direction of the smoke tube 100; the lower end of the sampling tube 321 is rotatably arranged on the rotary drum 310 around a horizontally arranged rotary shaft; a sampling hole 322 is arranged on the side wall of the sampling tube 321; the sampling holes 322 are provided with two groups, and the two groups of sampling holes 322 are symmetrically arranged at two sides of the sampling tube 321 about the vertical surface where the axis of the sampling tube 321 is positioned; the sampling holes 322 are uniformly distributed along the axis of the sampling tube 321. In the process of extracting the flue gas, because the filter cloth bag 324 produces the vortex to the flue gas for the concentration of the nitrogen oxide of the flue gas of filter cloth bag 324 below can become bigger than normal flow time-varying, the concentration of the nitrogen oxide in the flue gas of filter cloth bag 324 top can become smaller than normal flow time-varying, then establish sampling hole 322 in sampling tube 321 both sides, the flue gas that the nitrogen oxide concentration of the flue gas of extraction filter cloth bag 324 both sides is comparatively close, make in the extraction process, reduce the influence that the flue gas concentration deviation of extraction is great because of filter cloth bag 324 produces the disturbance to the flue gas, increase the degree of accuracy of monitoring.
The lower end of the sampling tube 321 is fixedly connected with a corrugated tube 323; the lower end of the corrugated pipe 323 passes through the rotary drum 310 and is inserted into the suction cavity so that the suction cavity is communicated with the interior of the smoke pipe 100; a supporting frame 330 is fixed on the sampling tube 321; the filter cloth bag 324 is in a long cylinder shape with a bag opening facing the rotary drum 310, and is sleeved on the sampling tube 321 through a supporting frame 330; the filter cloth bag 324 is made of flexible materials; the support frame 330 includes a circular arc-shaped support plate 331; the supporting plate 331 is fixed on the outer side wall of the sampling tube 321; the supporting plate 331 is arranged at one side of the rotating shaft close to the axis of the smoke tube 100; two stay bars 332 are symmetrically arranged on the support plate 331; the stay bar 332 is arranged along the axial direction of the sampling tube 321; the stay rod 332 is arranged on one side of the support plate 331 close to the axis of the smoke tube 100; one end of the stay rod 332, which is far away from the axis of the smoke tube 100, is fixed on the support plate 331; the filter cloth bag 324 is sleeved outside the stay bar 332 and the support plate 331. The support plate 331 is elliptical; the short axis of the support plate 331 is horizontally disposed and the long axis is vertically inclined. The filter cloth bag 324 is used for supporting the filter cloth bag into an oval shape with a horizontal cross section and a long axis arranged along the radial direction of the smoke tube 100, so as to reduce disturbance to smoke in the smoke tube 100 and improve the accuracy of sample extraction.
The driving component is used for driving the rotary drum 310 to rotate around the axis of the smoke tube 100 so as to make the samples extracted by the sampling tube 321 more uniform; the driving assembly comprises a driving motor 341 and a driving toothed ring 342; a driving gear ring 342 is coaxially fixed to the upper end of the drum 310; a matching groove is arranged on the groove wall on the upper side of the suction groove 210; the matching groove is a through groove; the driving motor 341 is fixed on the outer side wall of the mounting ring 200; a driving wheel is fixed on the output shaft of the driving motor 341; the drive wheel is geared by means of mating grooves with the drive toothed ring 342.
A rotation assembly 350 is provided between the drum 310 and the mounting ring 200; the rotation assembly 350 is used for driving the filter cloth bag 324 to rotate around the axis of the sampling tube 321 when the driving assembly drives the drum 310 to drive the sampling assembly 320 to revolve around the axis of the smoke tube 100. So that the suction position corresponding to the sampling hole 322 on the sampling tube 321 is always updated and changed, and the blockage caused by long-term suction and filtration at the position corresponding to the filter cloth bag 324 is avoided. The spin pack 350 includes a connection cylinder 351; the connecting cylinder 351 is arranged at one side of the filter cloth bag 324 close to the rotary cylinder 310; the connecting cylinder 351 is arranged in an up-down inclined way and sleeved outside the sampling tube 321; the upper end of the connecting cylinder 351 is fixedly connected with the mouth of the filter cloth bag 324; the lower end is rotatably mounted to the drum 310 on the side near the axis of the smoke tube 100.
A self-rotating wheel 352 and a self-rotating toothed ring 353 are arranged between the connecting cylinder 351 and the groove wall of the suction groove 210; the rotation toothed ring 353 is coaxially fixed to the groove wall at the upper side of the suction groove 210; the self-rotating wheel 352 is coaxially fixed on the outer side wall of the connecting cylinder 351; the self-rotating wheel 352 is engaged with the self-rotating toothed ring 353. When the driving component drives the rotary drum 310 to rotate around the axis of the smoke tube 100, the self-rotating toothed ring 353 drives the self-rotating wheel 352 to drive the connecting drum 351 to rotate, and the connecting drum 351 drives the filter cloth bag 324 to rotate around the axis of the sampling tube 321, so that the suction position corresponding to the sampling hole 322 on the sampling tube 321 is always updated and changed, and the situation that the position corresponding to the filter cloth bag 324 is blocked due to long-term suction and filtration is avoided, and the sampling effect is affected.
The detection mechanism 400 is used for driving the suction cavity to generate negative pressure, so that the smoke in the smoke tube 100 is filtered by the filter cloth bag 324, and enters the suction cavity through the sampling tube 321 and the corrugated tube 323, and the gas in the suction cavity is detected. The detection mechanism 400 includes a housing; the outer shell is fixed on the smoke tube 100 and is positioned below the mounting ring 200; a sensor for monitoring the concentration of nitrogen oxides is arranged in the shell; the upper end of the shell is connected with an air inlet pipe 410; the air inlet pipe 410 is fixed on the mounting ring 200 and is communicated with the suction cavity; the lower end of the shell is connected with an exhaust pipe 420; the exhaust pipe 420 is fixedly connected and communicated with the smoke pipe 100; the air inlet pipe 410 and the air outlet pipe 420 are respectively provided with an air pump so as to suck the air in the suction cavity to the sensor in the shell and discharge the air in the shell into the smoke pipe 100. A static mixer is provided in the air inlet pipe 410. The device is used for mixing samples extracted by the plurality of sampling assemblies 320 before entering the shell for detection, so that the detection precision is improved, and the influence of differences of nitrogen oxide concentrations at different positions on detection results is reduced.
In the embodiment, a stabilizing cylinder 311 is arranged on one side of the rotary cylinder 310, which is close to the axis of the smoke tube 100; the groove wall of the suction groove 210 near the upper end of the rotary drum 310 is provided with an annular chute; the stabilizing cylinder 311 and the rotating cylinder 310 are coaxially arranged; the stabilizing cylinder 311 is funnel-shaped with the small end facing downwards, and the conicity of the stabilizing cylinder 311 is the same as that of the rotating cylinder 310; the lower end of the stabilizing cylinder 311 is fixedly connected with the rotary cylinder 310, and the upper end is in rotary fit with the groove wall of the suction groove 210 through a sliding groove. The stabilizing drum 311 serves to stabilize the rotation of the drum 310 while isolating the flue gas from the spin pack 350.
In combination with the above embodiment, the use principle and working process of the present invention are as follows: when monitoring nitrogen oxides, the suction pump is used for pumping air to enable negative pressure to be generated in the suction cavity, and the suction is carried out on different positions in the smoke tube 100 through the sampling assemblies 320, so that smoke in the smoke tube 100 is filtered by the filter cloth bag 324, and samples at all positions are converged in the suction cavity through the sampling tube 321 and the corrugated tube 323, so that nitrogen oxides are detected on gas in the suction cavity, and inaccurate monitoring caused by single-point collection is avoided. Meanwhile, the driving motor 341 is started to drive the rotary drum 310 to drive the sampling assembly 320 to rotate through the driving gear ring 342, so that the samples extracted by the sampling tube 321 are more uniform, and the monitoring result is more objective and accurate. In the airflow of the smoke, the filter cloth bag 324 swings along with the airflow of the smoke, so that the flow of the smoke in the smoke tube 100 can be better adapted, the disturbance to the smoke can be weakened to a certain extent, and the sampling precision is improved.
Meanwhile, when the rotary drum 310 rotates around the axis of the smoke tube 100, the self-rotating gear ring 353 drives the self-rotating wheel 352 to drive the connecting drum 351 to rotate, and the connecting drum 351 drives the filter cloth bag 324 to rotate around the axis of the sampling tube 321, so that the suction position corresponding to the sampling hole 322 on the sampling tube 321 is always updated and changed, and the situation that the position corresponding to the filter cloth bag 324 is blocked due to long-term suction and filtration is avoided, and the sampling effect is affected.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
1. A nitrogen oxide monitor suitable for complex environment, its characterized in that: comprises a mounting ring, a sampling mechanism and a detection mechanism;
The mounting ring is arranged between two adjacent smoke pipes with vertical axes and coaxially arranged; the mounting ring is coaxial with the smoke tube; the flow direction of the smoke in the smoke tube is from bottom to top; the upper end and the lower end of the mounting ring are fixedly connected with the corresponding smoke tube; the side wall of the mounting ring, which faces the axis of the smoke tube, is provided with an annular suction groove; the suction groove and the mounting ring are coaxially arranged;
The sampling mechanism comprises a rotary drum, a sampling assembly and a driving assembly; the rotary drum is rotationally arranged in the suction groove along the circumferential direction of the smoke tube; the rotary drum surrounds the suction groove into a suction cavity; the sampling assemblies are arranged in a plurality of ways and uniformly distributed along the circumferential direction of the smoke tube; the sampling component is arranged on the side wall of the rotary drum, which is close to the axis of the smoke tube; the sampling assembly comprises a sampling tube and a filter cloth bag; the sampling tube is arranged in an up-down inclined way; the upper end of the sampling tube is close to the axis of the smoke tube, and the lower end of the sampling tube is far away from the axis of the smoke tube; the projection of the sampling tube on the horizontal plane is radially arranged along the smoke tube; the lower end of the sampling tube is rotatably arranged on the rotary drum around a rotary shaft which is horizontally arranged; the side wall of the sampling tube is provided with a sampling hole; the lower end of the sampling tube is fixedly connected with a corrugated tube; the lower end of the corrugated pipe passes through the rotary drum and is inserted into the suction cavity so as to enable the suction cavity to be communicated with the smoke pipe; a support frame is fixed on the sampling tube; the filter cloth bag is in a long cylinder shape with a bag opening facing the rotary drum, and is sleeved on the sampling tube through the supporting frame; the filter cloth bag is made of flexible materials; the driving component is used for driving the rotary drum to rotate around the axis of the smoke pipe; the section of the suction groove is in a U shape with an opening facing the axis of the smoke tube and arranged obliquely upwards; the rotary drum is in a funnel shape with the small end facing downwards; a rotation assembly is arranged between the rotary drum and the mounting ring; the rotation assembly is used for driving the filter cloth bag to rotate around the axis of the sampling tube when the driving assembly drives the rotary drum to drive the sampling assembly to revolve around the axis of the smoke tube; the autorotation assembly comprises a connecting cylinder; the connecting cylinder is arranged at one side of the filter cloth bag close to the rotary cylinder; the connecting cylinder is arranged in an up-down inclined way and sleeved on the outer side of the sampling tube; the upper end of the connecting cylinder is fixedly connected with the mouth of the filter cloth bag; the lower end is rotatably arranged at one side of the rotary drum, which is close to the axis of the smoke tube; a self-rotating wheel and a self-rotating toothed ring are arranged between the connecting cylinder and the groove wall of the suction groove; the autorotation toothed ring is coaxially fixed on the groove wall at the upper side of the suction groove; the self-rotating wheel is coaxially fixed on the outer side wall of the connecting cylinder; the self-rotating wheel is meshed with the self-rotating toothed ring; the driving assembly comprises a driving motor and a driving toothed ring; the driving toothed ring is coaxially fixed at the upper end of the rotary drum; the groove wall on the upper side of the suction groove is provided with a matching groove; the matching groove is a through groove; the driving motor is fixed on the outer side wall of the mounting ring; a driving wheel is fixed on the output shaft of the driving motor; the driving wheel is meshed and transmitted with the driving toothed ring through the matching groove;
The detection mechanism is used for driving the suction cavity to generate negative pressure so that smoke in the smoke tube is filtered by the filter cloth bag, enters the suction cavity through the sampling tube and the corrugated tube, and detects the gas in the suction cavity; the detection mechanism comprises a shell; the shell is fixed on the smoke tube and is positioned below the mounting ring; a sensor for monitoring the concentration of nitrogen oxides is arranged in the shell; the upper end of the shell is connected with an air inlet pipe; the air inlet pipe is fixed on the mounting ring and is communicated with the suction cavity; the lower end of the shell is connected with an exhaust pipe; the exhaust pipe is fixedly connected and communicated with the smoke pipe; and the air inlet pipe and the air outlet pipe are respectively provided with an air pump.
2. A nitrogen oxide monitoring instrument suitable for use in complex environments as claimed in claim 1, wherein: the sampling holes are provided with two groups, and the two groups of sampling holes are symmetrically arranged at two sides of the sampling tube relative to the vertical surface where the axis of the sampling tube is positioned; the sampling holes are uniformly distributed along the axis of the sampling tube.
3. A nitrogen oxide monitoring instrument suitable for use in complex environments as claimed in claim 2, wherein: a stabilizing cylinder is arranged on one side of the rotary cylinder, which is close to the axis of the smoke tube; the groove wall of the suction groove, which is close to the upper end of the rotary drum, is provided with an annular chute; the stabilizing cylinder and the rotating cylinder are coaxially arranged; the stabilizing cylinder is funnel-shaped with the small end facing downwards, and the conicity of the stabilizing cylinder is the same as that of the rotating cylinder; the lower end of the stabilizing cylinder is fixedly connected with the rotating cylinder, and the upper end of the stabilizing cylinder is in running fit with the groove wall of the suction groove through the sliding groove.
4. A nitrogen oxide monitoring instrument suitable for use in complex environments as claimed in claim 3, wherein: the support frame comprises an arc-shaped support plate; the supporting plate is fixed on the outer side wall of the sampling tube; the supporting plate is arranged on one side of the rotating shaft, which is close to the axis of the smoke tube; two supporting rods are symmetrically arranged on the supporting plate; the stay bar is arranged along the axis direction of the sampling tube; the supporting rod is arranged at one side of the supporting plate, which is close to the axis of the smoke tube; one end of the stay bar, which is far away from the axis of the smoke tube, is fixed on the support plate; the filter cloth bag is sleeved outside the supporting rod and the supporting plate.
5. A nitrogen oxide monitor suitable for use in complex environments as claimed in claim 4, wherein: the supporting plate is elliptical; the minor axis of backup pad level sets up, and the major axis sets up with inclination from top to bottom.
6. A nitrogen oxide monitoring instrument suitable for use in complex environments as claimed in claim 1, wherein: a static mixer is arranged in the air inlet pipe.
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| CN202410668041.1A CN118243462B (en) | 2024-05-28 | 2024-05-28 | Nitrogen oxide monitoring instrument suitable for complex environment |
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| CN205785987U (en) * | 2016-07-13 | 2016-12-07 | 湖南大唐先一能源管理有限公司 | The escaping of ammonia rate Multipoint Uniform sampling and measuring system |
| CN113567203A (en) * | 2021-07-28 | 2021-10-29 | 国能濮阳热电有限公司 | Flue gas measuring device |
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| CN207197590U (en) * | 2017-09-30 | 2018-04-06 | 南京通络自动化科技有限公司 | A kind of power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system |
| CN209356262U (en) * | 2018-09-13 | 2019-09-06 | 江苏国信靖江发电有限公司 | A kind of flue gas sampling device |
| DE202022102938U1 (en) * | 2022-05-26 | 2022-08-23 | Huaneng Jining canal Power Generation Co., Ltd | Self-regulating sampling device for the denitrification flue |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205785987U (en) * | 2016-07-13 | 2016-12-07 | 湖南大唐先一能源管理有限公司 | The escaping of ammonia rate Multipoint Uniform sampling and measuring system |
| CN113567203A (en) * | 2021-07-28 | 2021-10-29 | 国能濮阳热电有限公司 | Flue gas measuring device |
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