CN211504270U - Secondary air volume measuring device based on flow field flow equalization - Google Patents
Secondary air volume measuring device based on flow field flow equalization Download PDFInfo
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- CN211504270U CN211504270U CN202020160950.1U CN202020160950U CN211504270U CN 211504270 U CN211504270 U CN 211504270U CN 202020160950 U CN202020160950 U CN 202020160950U CN 211504270 U CN211504270 U CN 211504270U
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Abstract
The utility model relates to a secondary amount of wind measuring device based on flow field flow equalizes, include: a flow guide plate: the elbow that is used for setting up in the secondary air duct, the wall panel: the inner angle and the outer angle of the secondary air duct elbow are provided with a measuring component: the measuring assembly comprises a plurality of load cells distributed on the same plane, a pressure transmission pipe for connecting the plurality of load cells and a pressure transmitter connected with the pressure transmission pipe. The utility model flow field flow equalization is carried out through the guide plate and the wall panel on the premise of not changing the original secondary air duct arrangement, and the speed distribution uniformity and stability of the section of the air quantity on-line measuring component are improved; the optimized arrangement of the guide plates and the wall panels, the optimized design of the measuring components and the optimized selection of the measuring positions are integrated, the accuracy of the online measurement of the secondary air volume is greatly improved, and the deviation of the air volume coefficient is controlled within 3 percent.
Description
Technical Field
The utility model relates to an amount of wind measuring device especially relates to a secondary amount of wind measuring device based on flow field flow equalizes.
Background
Along with the on-site arrangement of large coal-fired power plants, the secondary air duct straight section between the outlet of the air preheater and the inlet of the secondary air box is too short, and the problems of overlarge secondary air volume on-line measurement deviation, severe fluctuation and the like exist in each power plant to different degrees. Especially, the current power grid dispatching automatic power generation control system has higher and higher requirements on the load response rate of a generator set, the problem of inaccurate online secondary air quantity measurement seriously restricts the accurate automatic control of the secondary air quantity of a boiler of a coal-fired power plant, the power consumption of a boiler fan, pulverized coal combustion, nitrogen oxide control, low-load stable combustion and the like are all affected adversely, and the safe operation of the boiler is also hidden danger to a certain degree.
Referring to the chinese patent with publication number CN207248254, an air volume measuring device is disclosed, which adopts independent total pressure pipe and static pressure pipe to realize multi-point measurement of cross section, but does not consider flow field flow equalization synchronously, and the accuracy of air volume measurement cannot be guaranteed for fluid environment with uneven velocity distribution, even eddy and backflow.
Disclosure of Invention
The utility model aims at providing a secondary amount of wind measuring device based on flow field flow equalizes.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a secondary air volume measuring device based on flow field is flow equalized, includes:
a flow guide plate: is used for being arranged at the elbow of the secondary air duct,
wall panel: is used for being arranged at the inner corner and the outer corner of the secondary air duct elbow,
a measuring component: the measuring assembly comprises a plurality of load cells distributed on the same plane, a pressure transmission pipe for connecting the plurality of load cells and a pressure transmitter connected with the pressure transmission pipe.
Preferably, the guide plate has an arc-shaped section and a straight section connected with one end of the arc-shaped section, and when the guide plate is arranged at the elbow of the secondary air duct, the straight section of the guide plate is located at the downstream of the arc-shaped section.
Preferably, the guide plate is provided with a plurality of blocks at one elbow of the secondary air duct.
Further preferably, the deflector is provided with not less than 3 blocks at an elbow of the secondary air duct.
Preferably, the shape of the wall panel is matched with the shapes of the inner corner and the outer corner of the secondary air duct elbow.
Further preferably, the wall panel is an arc-shaped panel.
Preferably, a plurality of the load cells are uniformly distributed on the same plane.
Further preferably, the pressure transmission pipes are provided with a plurality of pressure transmission pipes, each pressure transmission pipe connects a plurality of load cells vertically distributed on a straight line, and the plurality of pressure transmission pipes are connected with the pressure transmitter through a main pipe.
Preferably, the load cells are provided with not less than 16.
Preferably, when the measuring assembly is disposed within the straight tube of the secondary air path, the measuring assembly is located at 1/3 near the downstream end of the straight tube.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
1. on the premise of not changing the original secondary air duct arrangement, flow field equalization is carried out through the guide plate and the wall panel, and the speed distribution uniformity and stability of the section where the air quantity online measurement assembly is located are improved;
2. the optimized arrangement of the guide plates and the wall panels, the optimized design of the measuring components and the optimized selection of the measuring positions are integrated, the accuracy of the online measurement of the secondary air volume is greatly improved, and the deviation of the air volume coefficient is controlled within 3 percent.
Drawings
FIG. 1 is a schematic view of the present embodiment disposed in a secondary air duct;
fig. 2 is a schematic view of a measuring assembly in the present embodiment.
Wherein: 1. a baffle; 10. an arc-shaped section; 11. a straight section; 2. a wall panel; 3. a measurement assembly; 30. a load cell; 31. a pressure transmitting pipe; 32. a main pipe; 33. a pressure transmitter; 4. a secondary air duct; 40. bending the pipe; 41. flattening the pipe; 42. an expansion joint.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in the figure, the secondary air quantity measuring device based on flow field flow equalization comprises a guide plate 1, a wall panel 2 and a measuring component 3. Specifically, the method comprises the following steps:
the baffle 1 is arranged at the bend 40 of the secondary air duct 4. The air deflector 1 is provided with an arc-shaped section 10 and a straight section 11 connected with one end of the arc-shaped section 10, and the straight section 11 is equivalent to the tail wing of the whole air deflector 1. When the baffle 1 is arranged at the bend 40 of the secondary air duct 4, the straight section 11 of the baffle 1 is located downstream of its curved section 10. The baffle 1 is provided with a plurality of pieces, preferably not less than 3 pieces, at one bend 40 of the secondary air duct 4.
The wall panel 2 is used for being arranged at the inner corner and the outer corner of the secondary air duct 4 elbow 40, the shape of the wall panel 2 is matched with the shape of the inner corner and the outer corner of the secondary air duct 4 elbow 40, usually, the inner corner and the outer corner of the secondary air duct 4 elbow 40 are provided with arc chamfers, and the wall panel 2 can be an arc plate.
The measuring assembly 3 is intended to be arranged in a straight tube 41 of the secondary air duct 4. In this embodiment: the measuring assembly 3 comprises a plurality of load cells 30 distributed on the same plane, a pressure transmitting tube 31 connecting the plurality of load cells 30, and a parent tube 32 and a pressure transmitter 33 connected to the pressure transmitting tube 31. The plurality of load cells 30 are uniformly distributed on the same plane, and no less than 16 load cells 30 are arranged, and 16 load cells 30 are taken as an example in the figure. A plurality of pressure transmission pipes 31 are provided, each of which 31 connects a plurality of load cells 30 distributed vertically, and the plurality of pressure transmission pipes 31 are connected to a pressure transmitter 33 through a single header pipe 32, and 4 pressure transmission pipes 31 are illustrated as an example.
As shown in fig. 1, the secondary air duct 4 has an inlet for receiving the incoming hot secondary air from the outlet of the air preheater and an outlet connected to the inlet of the windbox, and the whole secondary air duct 4 has three bends 40 and a straight section, and expansion joints 42 are provided at the positions where the bends 40 are connected to the straight section.
The following describes the application of the present embodiment in the secondary air duct 4 specifically:
3 guide plates 1 are respectively arranged at the elbow 40 of the secondary air duct 4; the wall panels 2 are respectively arranged at the inner corner and the outer corner of the elbow 40 of the secondary air duct 4, the radius of the arc-shaped plate of the wall panel 2 at the inner corner is not too large, the position of the on-site expansion joint 42 is not interfered, the radius of the arc-shaped plate of the wall panel 2 at the outer corner is not too small, and the flow field flow equalizing requirement is met; the measuring assembly 3 is disposed in the straight tube 41 of the secondary air path 4. Optimally designing the guide plate 1 and the wall panel 2, preferably measuring the cross section of the online air quantity according to the relative standard deviation (the numerical simulation result is shown in table 1) of the speed distribution of each cross section of the flat pipe 41 of the secondary air duct 4, and finally determining the total measuring point number of the measuring element 30.
Table one:
| measuring the position of the cross section on the secondary air duct straight pipe | Relative standard deviation of |
| 2/3 near the downstream end | 5.9% |
| 1/2 near the downstream end | 5.6% |
| 1/3 near the downstream end | 5.4% |
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. The utility model provides a secondary air volume measuring device based on flow field is flow equalized which characterized in that: the method comprises the following steps:
a flow guide plate: is used for being arranged at the elbow of the secondary air duct,
wall panel: is used for being arranged at the inner corner and the outer corner of the secondary air duct elbow,
a measuring component: the measuring assembly comprises a plurality of load cells distributed on the same plane, a pressure transmission pipe for connecting the plurality of load cells and a pressure transmitter connected with the pressure transmission pipe.
2. The secondary air volume measuring device based on flow field equalization of claim 1, characterized in that: the guide plate is provided with an arc-shaped section and a straight section connected with one end of the arc-shaped section, and when the guide plate is arranged at the elbow of the secondary air duct, the straight section of the guide plate is positioned at the downstream of the arc-shaped section.
3. The secondary air volume measuring device based on flow field equalization of claim 1, characterized in that: the guide plate is provided with a plurality of blocks at one elbow of the secondary air duct.
4. The secondary air flow measuring device based on flow field equalization of claim 3, characterized in that: the guide plate is provided with at least 3 blocks at an elbow of the secondary air duct.
5. The secondary air volume measuring device based on flow field equalization of claim 1, characterized in that: the shape of the wall panel is matched with the shapes of the inner corner and the outer corner of the secondary air duct elbow.
6. The secondary air volume measuring device based on flow field equalization according to claim 1 or 5, characterized in that: the wall panel is an arc-shaped plate.
7. The secondary air volume measuring device based on flow field equalization of claim 1, characterized in that: the plurality of load cells are uniformly distributed on the same plane.
8. The secondary air flow measuring device based on flow field equalization of claim 7, characterized in that: the pressure transmission pipe is provided with a plurality of pressure transmission pipes, each pressure transmission pipe connects a plurality of pressure measurement elements vertically distributed on a straight line, and the pressure transmission pipes are connected with the pressure transmitter through a main pipe.
9. The secondary air volume measuring device based on flow field equalization of claim 1 or 7, characterized in that: the number of the load cells is not less than 16.
10. The secondary air volume measuring device based on flow field equalization of claim 1, characterized in that: when the measuring assembly is disposed within the straight tube of the secondary air path, the measuring assembly is located at 1/3 near the downstream end of the straight tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020160950.1U CN211504270U (en) | 2020-02-11 | 2020-02-11 | Secondary air volume measuring device based on flow field flow equalization |
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| CN202020160950.1U CN211504270U (en) | 2020-02-11 | 2020-02-11 | Secondary air volume measuring device based on flow field flow equalization |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218460A (en) * | 2021-05-21 | 2021-08-06 | 京仪股份有限公司 | Air volume measuring structure based on flow equalizing technology |
| CN114151788A (en) * | 2021-12-02 | 2022-03-08 | 无锡华光环保能源集团股份有限公司 | Secondary air pipe structure of circulating fluidized bed boiler |
| WO2023236513A1 (en) * | 2022-06-08 | 2023-12-14 | 西安热工研究院有限公司 | Processing method for flue gas and air duct measurement section, and flue gas and air duct measurement section |
-
2020
- 2020-02-11 CN CN202020160950.1U patent/CN211504270U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218460A (en) * | 2021-05-21 | 2021-08-06 | 京仪股份有限公司 | Air volume measuring structure based on flow equalizing technology |
| CN114151788A (en) * | 2021-12-02 | 2022-03-08 | 无锡华光环保能源集团股份有限公司 | Secondary air pipe structure of circulating fluidized bed boiler |
| CN114151788B (en) * | 2021-12-02 | 2023-11-21 | 无锡华光环保能源集团股份有限公司 | Secondary air pipe structure of circulating fluidized bed boiler |
| WO2023236513A1 (en) * | 2022-06-08 | 2023-12-14 | 西安热工研究院有限公司 | Processing method for flue gas and air duct measurement section, and flue gas and air duct measurement section |
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