CN220230587U - Large-section vertical pipeline dust-containing airflow flow detection device - Google Patents
Large-section vertical pipeline dust-containing airflow flow detection device Download PDFInfo
- Publication number
- CN220230587U CN220230587U CN202321674566.3U CN202321674566U CN220230587U CN 220230587 U CN220230587 U CN 220230587U CN 202321674566 U CN202321674566 U CN 202321674566U CN 220230587 U CN220230587 U CN 220230587U
- Authority
- CN
- China
- Prior art keywords
- pressure equalizing
- equalizing box
- differential pressure
- dust
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000428 dust Substances 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 title claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 16
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 16
- 241001330002 Bambuseae Species 0.000 claims description 16
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 16
- 239000011425 bamboo Substances 0.000 claims description 16
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000003068 static effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 241001075517 Abelmoschus Species 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model relates to the technical field of gas flow measurement, in particular to a dust-containing gas flow detection device for a large-section vertical pipeline, wherein the side surface of a negative pressure equalizing box component is connected with a plurality of closed differential pressure generating cylinders side by side, a positive pressure equalizing box component is positioned right above the differential pressure generating cylinders, the positive pressure equalizing box component and the negative pressure equalizing box component are identical in structure and both comprise pressure equalizing boxes and dust falling hoppers which are connected with the lower ends of the pressure equalizing boxes and correspond to the differential pressure generating cylinders, the upper ends of the pressure equalizing boxes are connected with eduction tubes, sampling tubes are connected onto the dust falling hoppers, and the space between the sampling tubes in the positive pressure equalizing box component and the differential pressure generating cylinders is 5-15mm. According to the utility model, the differential pressure generating cylinder is arranged in the large-section pipeline of the boiler, the vertical dust-containing air flow flows from top to bottom, the flow in the pipeline can be calculated by detecting the differential pressure generated above and at the side of the differential pressure generating cylinder, and meanwhile, the opening of the sampling pipe of the device is downwards arranged, so that the blockage of the sampling pipe during the differential pressure detection can be avoided, and the multi-point detection can be realized.
Description
Technical Field
The utility model relates to the technical field of gas flow measurement, in particular to a dust-containing gas flow detection device for a large-section vertical pipeline.
Background
At present, the devices for measuring the gas flow in China are various in types and mainly comprise an airfoil type, a Venturi type, an Abelmoschus type, a pore plate type, a multi-point backrest pipe type and the like, different types of gas flow measuring devices can be selected according to different equipment conditions in each field, and each type of measuring device has various advantages and disadvantages in use, but for the large-section vertical pipeline dust-containing gas of a large-scale power station boiler, and the pipeline with the airflow direction from top to bottom, the proper measuring device is not found for the flow measurement, and the main reasons are as follows:
1. the domestic large-scale utility boilers are coal-fired boilers, a large amount of dust is contained in the gas in the pipeline, and particularly when the direction of the gas flow perpendicular to the pipeline is from top to bottom, the existing various differential pressure type flow devices have serious blocking phenomena, so that the output differential pressure signals are distorted, and the device cannot be reliably used for a long time.
2. With the continuous improvement of the domestic manufacturing level, the capacity of the existing large-scale power station boiler is larger and larger, the section of a corresponding pipeline is larger and larger, the speed distribution of air flow on the section of the pipeline is also uneven, the measuring points of part of air volume measuring devices are fewer, the distribution is unreasonable, and the actual flow in the pipeline can not be accurately measured by adopting single-point or several-point measurement in the prior art.
Disclosure of Invention
The utility model aims to solve the defects and provides a dust-containing airflow flow detection device for a large-section vertical pipeline.
In order to overcome the defects in the background art, the technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a big cross-section vertical pipeline dust-laden air current flow detection device, includes parallel arrangement in positive pressure equalizing box subassembly and the negative pressure equalizing box subassembly in the pipeline, a plurality of closed differential pressure production section of thick bamboo are connected side by side to the negative pressure equalizing box subassembly side, positive pressure equalizing box subassembly is located the differential pressure production section of thick bamboo directly over, both structures of positive pressure equalizing box subassembly and negative pressure equalizing box subassembly are the same, positive pressure equalizing box subassembly and negative pressure equalizing box subassembly all include hollow structure's pressure equalizing box and the ash bucket that the pressure equalizing box lower extreme is connected corresponding with the differential pressure production section of thick bamboo, the extraction pipe is connected to the pressure equalizing box upper end, connect the sampling tube on the ash bucket, interval between sampling tube in the positive pressure equalizing box subassembly and the differential pressure production section of thick bamboo is 5-15mm.
Further improvements include the differential pressure generating cartridge having a hollow interior.
Further improvements include the use of truncated cone or isosceles trapezoid structures for the dust hopper.
Further improvement comprises that the pressure equalizing box and the ash dropping hopper adopt flat structures.
The beneficial effects of the utility model are as follows: this design lays differential pressure production section of thick bamboo in the boiler large-section pipeline that perpendicular and dust-laden air current top-down flowed, and the differential pressure that detects differential pressure production section of thick bamboo top and side produced can survey out the flow in the pipeline, arranges the sampling tube opening of this device down simultaneously, and sampling tube jam when can avoiding detecting differential pressure to can realize the multiple spot detection, set up the ash bucket and make the dust can utilize the washing of self gravity or intraductal air current to drop in the wind channel of pipeline again, thereby a plurality of differential pressure production section of thick bamboo can realize the multiple spot measurement and can calculate the average velocity of flow and the flow of intraductal air current of exit.
Drawings
The utility model will be further described with reference to the drawings and examples.
FIG. 1 is a front view of the present utility model;
FIG. 2 is a top view of the present utility model;
in the figure, a 1-differential pressure generating cylinder, a 2-ash falling hopper, a 3-positive pressure equalizing box assembly, a 4-eduction tube, a 5-pressure equalizing box, a 6-sampling tube and a 7-negative pressure equalizing box assembly are arranged.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. Embodiments of the utility model are described herein in terms of various specific embodiments, including those that are apparent to those of ordinary skill in the art and all that come within the scope of the utility model.
According to the figure 1 and 2 show, a big cross-section vertical pipeline contains dirt air current flow detection device, including parallel arrangement in positive pressure equalizing box subassembly 3 and negative pressure equalizing box subassembly 7 in the pipeline, a plurality of closed differential pressure production section of thick bamboo 1 are connected side by side to negative pressure equalizing box subassembly 7 side, positive pressure equalizing box subassembly 3 is located the differential pressure production section of thick bamboo 1 directly over, positive pressure equalizing box subassembly 3 and negative pressure equalizing box subassembly 7 both structures are the same, positive pressure equalizing box subassembly 3 and negative pressure equalizing box subassembly 7 all include hollow structure's pressure equalizing box 5 and the ash falling hopper 2 that the pressure equalizing box 5 lower extreme is connected corresponding to differential pressure production section of thick bamboo 1, the extraction pipe 4 is connected to pressure equalizing box 5 upper end, connect sampling tube 6 on the ash falling hopper 2, interval between sampling tube 6 and the differential pressure production section of thick bamboo 1 in the positive pressure equalizing box subassembly 3 is 5-15mm, and the thin wall structure is adopted to furthest reduce the influence when producing differential pressure production section of thick bamboo 1, and simultaneously not influence the uniformity of pressure, because when gas pressure is even, the dust is difficult to avoid taking into even dust falling into even box 5 and falling into the corresponding dust falling hopper 2, the dust can fall into the wind channel of the pipeline again, and the dust can fall by self to the dust in a small amount of the pipeline.
For a large-section pipeline of a boiler, because the distribution of a fluid velocity field in a pipe is very uneven, it is far insufficient to accurately measure the flow in the pipe, because one differential pressure generating cylinder 1 can only measure the velocity of a part near the differential pressure generating cylinder 1, the flow in the large-section pipeline is accurately measured, and the multiple points of measurement are realized by organically arranging a plurality of differential pressure generating cylinders 1 on the section of the whole air duct, the design is used for quickly connecting each sampling pipe 6 with a pressure equalizing box 5, respectively detecting the upper end and the side surface of the differential pressure generating cylinder 1, finally respectively obtaining the output total pressure of a positive pressure equalizing box assembly 3 and a negative pressure equalizing box assembly 7, and obtaining an average total differential pressure, thereby calculating the average flow velocity and the flow of the air flow in the pipeline.
By adopting the embodiment, the device is arranged in a large-section pipeline of a vertical boiler, dust-containing air flows from top to bottom, the differential pressure generating cylinder 1 is arranged in the pipeline, the differential pressure generated above the differential pressure generating cylinder 1 can be detected to calculate the flow of the air flow in the pipeline by detecting the differential pressure generated above and at the side of the differential pressure generating cylinder 1 because the differential pressure generating cylinder 1 is opposite to the incoming flow and the pressure of the gas static pressure in the pipeline is different from the pressure of the incoming flow, the sampling pipe 6 of the device is downwards arranged at the opening, the phenomenon that the output differential pressure signal is distorted due to the blockage of the sampling pipe 6 when the differential pressure is detected can be avoided, the device is a combined utility model, the device can be arranged in the diameter direction in a circular pipeline, and a plurality of rows of the devices can be combined in the rectangular pipeline, and the mode can accurately detect the average flow speed and the flow of the air flow in the pipeline.
The inside of the differential pressure generating cylinder 1 is of a hollow structure, which is beneficial to reducing the dead weight of the differential pressure generating cylinder 1 and saving materials; the ash falling hopper 2 adopts a truncated cone structure or an isosceles trapezoid structure, so that the entering dust can fall into an air channel of the pipeline along the side wall of the ash falling hopper 2; the pressure equalizing box 5 and the ash falling hopper 2 adopt flat structures, and the structures increase the contact area between the differential pressure generating cylinder 1 and dust-containing air flow in the pipeline.
Working principle: when the air flow in the pipeline blows to the differential pressure generating cylinder 1 at a certain speed, differential pressure is generated above and at the side surface of the differential pressure generating cylinder 1, and the kinetic energy of the air flow is converted into pressure energy due to the fact that the upper part of the differential pressure generating cylinder 1 is opposite to the incoming flow and is impacted by the incoming flow, so that pressure higher than the static pressure of the air in the pipe is generated at the upper part of the differential pressure generating cylinder 1 and is called "+" pressure, and the pressure at the side surface of the differential pressure generating cylinder 1 is still the static pressure in the pipe due to the fact that the air flow is not impacted by the differential pressure generating cylinder 1. The difference value of the two can reflect the outflow speed, the larger the speed is, the larger the differential pressure is, the practice proves that the speed is in direct proportion to the root mean square of the differential pressure, the sampling pipes 6 of the positive pressure equalizing box assembly 3 and the negative pressure equalizing box assembly 7 are respectively inserted to the upper part and the side part of the differential pressure generating cylinder 1 from the vertical direction, the sizes of the "+" and the "-" can be accurately sampled, the ports of the sampling pipes 6 are downwards arranged, dust particles cannot enter the non-sampling pipes 6, the eduction pipe 3 is connected with an external differential pressure inverter, the differential pressure inverter acquires the differential pressure generated by calculation by the positive pressure in the positive pressure equalizing box assembly 5 and the negative pressure in the negative pressure equalizing box assembly 7, and meanwhile, dust entering the pressure equalizing box 5 falls into an air flue again through the blanking hopper 2 under the own gravity or the scouring of air flow in the pipe, and blockage cannot be generated.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (4)
1. The utility model provides a big cross-section vertical pipeline dust-laden air current flow detection device, characterized by, including parallel arrangement in positive pressure equalizing box subassembly (3) and negative pressure equalizing box subassembly (7) in the pipeline, a plurality of closed differential pressure production section of thick bamboo (1) are connected side by side to negative pressure equalizing box subassembly (7), positive pressure equalizing box subassembly (3) are located differential pressure production section of thick bamboo (1) directly over, positive pressure equalizing box subassembly (3) and negative pressure equalizing box subassembly (7) both are the same in structure, positive pressure equalizing box subassembly (3) and negative pressure equalizing box subassembly (7) all include hollow structure's pressure equalizing box (5) and pressure equalizing box (5) lower extreme are connected with differential pressure production section of thick bamboo (1) corresponding dust fall hopper (2), draw off pipe (4) are connected to pressure equalizing box (5) upper end, connect sampling tube (6) on dust fall hopper (2), interval between sampling tube (6) in positive pressure equalizing box subassembly (3) and differential pressure production section of thick bamboo (1) is 5-15mm.
2. A large cross-section vertical duct dusty gas stream flow sensing device as in claim 1 wherein: the inside of the differential pressure generating cylinder (1) is of a hollow structure.
3. A large cross-section vertical duct dusty gas stream flow sensing device as in claim 1 wherein: the ash falling hopper (2) adopts a truncated cone structure or an isosceles trapezoid structure.
4. A large cross-section vertical duct dust laden air flow detection apparatus as claimed in claim 3, wherein: the pressure equalizing box (5) and the ash falling hopper (2) adopt flat structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321674566.3U CN220230587U (en) | 2023-06-29 | 2023-06-29 | Large-section vertical pipeline dust-containing airflow flow detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321674566.3U CN220230587U (en) | 2023-06-29 | 2023-06-29 | Large-section vertical pipeline dust-containing airflow flow detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220230587U true CN220230587U (en) | 2023-12-22 |
Family
ID=89180746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321674566.3U Active CN220230587U (en) | 2023-06-29 | 2023-06-29 | Large-section vertical pipeline dust-containing airflow flow detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220230587U (en) |
-
2023
- 2023-06-29 CN CN202321674566.3U patent/CN220230587U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201555612U (en) | Self-deashing rectifier type cross section air quantity and air speed measuring device | |
| CN204228210U (en) | A kind of wear-resisting type self-cleaning flow measurement device | |
| CN206114017U (en) | Multiple spot matrix flow measuring device | |
| CN203848867U (en) | Rectification type total cross section multi-point self-ash-removing air duct flow measuring device | |
| CN209148489U (en) | A kind of dust concentration detection device | |
| CN220230587U (en) | Large-section vertical pipeline dust-containing airflow flow detection device | |
| CN105444833B (en) | A kind of equal pressure chamber, its installation method and the section formula gas flow surveying instrument comprising it | |
| CN110487337A (en) | A kind of flow sensor of plug-in type semi-parabolic multiple spot pressure | |
| CN201654053U (en) | Wind-speed online monitoring device of large-section air duct | |
| CN107907168A (en) | Flow measurement device and system with choke preventing function | |
| CN210645540U (en) | Blast furnace gas dry method dust removal sack box inlet and outlet pressure difference detection device | |
| CN201335843Y (en) | Double-throat-diameter venturi air-velocity measuring pipe | |
| CN209978975U (en) | Air quantity measuring sensor for vertical downward flow direction | |
| CN201672941U (en) | Chimney smoke flow measuring device | |
| CN207610734U (en) | Flow measurement device with choke preventing function and system | |
| CN203241088U (en) | Flow measuring device in air flue | |
| CN207007253U (en) | A kind of equal pressure chamber, the pipeline comprising it and include its wind and smoke flow measurement device | |
| CN207263230U (en) | A kind of anti-blocking apparatus for measuring air quantity of array | |
| CN205748503U (en) | A kind of venturi apparatus for measuring air quantity | |
| CN219141913U (en) | Array type air quantity measuring device with three groups of independent differential pressure outputs | |
| CN106525187B (en) | Differential pressure matrix flowmeter, differential pressure multi-point flowmeter and anti-blocking pressure guiding device | |
| CN220819082U (en) | Array type flow measuring device suitable for dust-containing airflow and having differential pressure amplifying function | |
| CN206300700U (en) | A kind of differential pressure matrix flowmeter, differential pressure multipoint stream gauge and anti-blocking pressure guiding device | |
| CN208780283U (en) | A kind of anti-clogging air measuring equipment | |
| CN113624289A (en) | Baffle differential pressure type fluid flow measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |