CN214308921U - Smoke and air volume measuring device capable of preventing air flow disturbance - Google Patents
Smoke and air volume measuring device capable of preventing air flow disturbance Download PDFInfo
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- CN214308921U CN214308921U CN202022979653.2U CN202022979653U CN214308921U CN 214308921 U CN214308921 U CN 214308921U CN 202022979653 U CN202022979653 U CN 202022979653U CN 214308921 U CN214308921 U CN 214308921U
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Abstract
The utility model discloses a smoke and air volume measuring device for preventing air flow disturbance, which comprises a smoke and air pipeline, wherein a flow straightener, a total pressure measuring unit and a static pressure measuring unit are arranged in the smoke and air pipeline along the air flow direction; the flow straightener comprises uniformly arranged flow speed correction units, and each flow speed correction unit comprises blades arranged along a plurality of directions; the full-pressure measuring unit comprises a full-pressure stabilizing collecting pipe which is vertical to the airflow direction and is parallel to the top of the smoke and air pipeline, and the upper side of the full-pressure stabilizing collecting pipe is communicated with one end of a full-pressure transmitting pipe which penetrates through the smoke and air pipeline; the utility model adopts the flow straightener arranged at the upstream of the flow measuring device, optimizes the flow field in the pipeline and prevents the influence of the airflow disturbance on the measuring result; the measuring data has more accuracy and reliability by combining the full pressure measuring point port and the static pressure measuring point port which are uniformly arranged in the flue, and the technical problem of inaccurate measurement of the smoke air quantity data in the prior art is solved.
Description
Technical Field
The utility model belongs to the technical field of power plant's cigarette air volume measurement, relate to cigarette air volume measurement, concretely relates to prevent cigarette air volume measuring device of air current disturbance.
Background
The air volume data and the flue gas volume data are important parameters in a boiler combustion system, participate in boiler combustion mechanism researches such as heat balance calculation, combustion optimization and the like, and are also important parameters for the operation of auxiliary machines such as power plant desulfurization, denitration and fans. Due to the limitations of measurement conditions and measurement accuracy, two methods of manual measurement and theoretical calculation are mostly adopted for the flow measurement of the smoke air duct. The manual measurement is to adopt a uniform section grid method in the smoke duct, select numerical values such as smoke dynamic pressure, static pressure, temperature, humidity and the like on each grid measuring point under different operating conditions, and then obtain the smoke air volume of the measuring section through calculation. The theoretical calculation method is generally calculated according to a chemical equivalent reaction formula of combustible substances in the fuel under a standard state, or calculated according to the relation between the inlet flue gas parameter of the induced draft fan and the air quantity-pressure of the induced draft fan.
The actual operation is influenced by an excess air coefficient, air leakage of equipment along the way, evaporation in an equipment system and the like, the theoretical calculation flow cannot truly reflect the actual smoke air volume, and the problem of accurate acquisition of the smoke air volume cannot be solved.
The principle of the measurement of the smoke air quantity is a Bernoulli calculation equation, namely the flow of the cross section can be calculated by the measured differential pressure, and the measurement mode requires that a measurement point port of the measurement device is arranged on a straight pipe section with stable airflow flow, and the smoke air pipeline at least meets the requirements of the straight pipe section of 'four front and two rear'. However, due to the limitations of the site space and the installation conditions of the thermal power plant, the length of the straight pipe section cannot meet the specification requirements of the installation point, so that accurate measurement is difficult to realize. And manual measurement can only be carried out under limited operation working conditions, and the data of each working condition point in the operation process cannot be displayed in real time.
Disclosure of Invention
Not enough to prior art exists, the utility model aims to provide a prevent smoke wind volume measuring device of air current disturbance solves among the prior art inaccurate technical problem of smoke wind volume data measurement.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
a smoke and air volume measuring device for preventing air flow disturbance comprises a smoke and air pipeline, wherein a flow straightener, a full pressure measuring unit and a static pressure measuring unit are sequentially arranged in the smoke and air pipeline along the air flow direction;
the flow straightener comprises flow speed correction units which are uniformly arranged along the airflow direction, each flow speed correction unit comprises blades which are arranged along a plurality of directions, and an air inlet pipe which is parallel to the airflow direction is formed by three adjacent blades;
the full-pressure measuring unit comprises a full-pressure stabilizing collecting pipe which is vertical to the airflow direction and is parallel to the top of the smoke and air pipeline, the upper side of the full-pressure stabilizing collecting pipe is communicated with one end of a full-pressure transmitting pipe which penetrates through the smoke and air pipeline, the other end of the full-pressure transmitting pipe is connected with a differential pressure measuring element, and a full-pressure measuring pipe group is fixedly and communicatively installed on the lower side of the full-pressure stabilizing collecting pipe;
the static pressure measuring unit comprises a static pressure stabilizing collecting pipe which is vertical to the airflow direction and is parallel to the top of the smoke and air pipeline, the upper side of the static pressure stabilizing collecting pipe is communicated with one end of a static pressure transmitting pipe which penetrates through the smoke and air pipeline, the other end of the static pressure transmitting pipe is connected with a differential pressure measuring element, and a static pressure measuring pipe group is fixedly and communicated and installed on the lower side of the static pressure stabilizing collecting pipe;
the full-pressure measuring pipe group comprises a plurality of full-pressure measuring pipes with different lengths, and the tail end of each full-pressure measuring pipe is provided with a full-pressure measuring point port; the static pressure measuring pipe group comprises a plurality of static pressure measuring pipes with different lengths, and the tail end of each static pressure measuring pipe is provided with a static pressure measuring point port;
the full pressure measuring point port is opposite to the airflow direction; the static pressure measuring point port is back to the airflow direction.
The utility model discloses still have following technical characteristic:
preferably, the inclination angle of the full pressure measuring point port relative to the airflow direction is 45-60 degrees; the inclination angle of the static pressure measuring point port relative to the airflow direction is 30-60 degrees.
Specifically, the total pressure measurement pipe group and the total pressure measurement pipe group are provided with a plurality of.
Specifically, the total pressure measuring tube and the static pressure measuring tube are metal detecting rods.
Specifically, the flow rate correction unit is provided with a plurality of flow rate correction units.
Compared with the prior art, the utility model, profitable technological effect is:
(I) the utility model discloses a flow straightener is arranged at the flow measuring device upper reaches, optimizes the inside flow field of pipeline, prevents the influence that the air current disturbance caused to measuring result, very big shortening the straight tube section requirement that the flue gas wind pipeline satisfies "four front and back two" at least, more be favorable to carrying out the accuracy under the condition that thermal power plant flue gas wind pipeline was many turned over and measure, solved among the prior art flue gas volume data measurement unsafe technical problem.
(II) the full pressure measuring point ports and the static pressure measuring point ports are uniformly arranged in the flue, the size and the number of the full pressure measuring point ports and the static pressure measuring point ports are customized according to the size of the flue, the full pressure measuring point ports and the static pressure measuring point ports are increased and decreased in proportion, and compared with single-point measurement, the measurement data has higher accuracy and reliability by replacing points with areas.
(III) the calibration method of the revision coefficient of the measuring device adopts a method of measuring the flow of the flue gas duct by using a standard Pitot tube grid on site to calibrate. The airflow disturbance prevention smoke and air volume measuring device is connected with flow correction software, the flow data are obtained through reading theoretical calculation of an operation database and self-learning intelligent analysis of the software, and if the deviation of the actually measured data of the flow device and the data exceeds 10%, the deviation of flow measurement can be judged to perform intervention correction.
Drawings
Fig. 1 is a front view of a smoke air volume measuring device that is protected from airflow disturbances.
Fig. 2 is a right side view of the smoke air volume measuring device against air flow disturbance.
Fig. 3 is a schematic diagram of the structure of the flow straightener.
Fig. 4 is a schematic structural view of a full pressure measuring unit and a static pressure measuring unit.
The meaning of the individual reference symbols in the figures is: 1-a smoke and air pipeline, 2-a flow straightener, 3-a full pressure measuring unit, 4-a static pressure measuring unit and 5-a differential pressure measuring element;
201-flow rate correction unit, 202-blade, 203-air inlet pipe;
301-full pressure stabilizing collecting pipe, 302-full pressure transmitting pipe, 303-full pressure measuring pipe group, 304-full pressure measuring pipe, 305-full pressure measuring point port;
401-static pressure stabilizing header, 402-static pressure transmitting pipe, 403-static pressure measuring pipe group, 404-static pressure measuring pipe and 405-static pressure measuring point port.
The following examples are provided to explain the present invention in further detail.
Detailed Description
The size of the blade is customized according to the size of the smoke channel, the length of the blade in the airflow direction in the embodiment is 0.2D-0.5D, the length of the blade is 0.02D-0.075D, and the distance between the flow straightener and the full-pressure measuring unit is 0.25D;
wherein:
d: the hydraulic diameter of the smoke and wind pipeline is indicated;
hydraulic diameter: which is four times the ratio of flow cross-sectional area to perimeter.
It should be noted that, in this embodiment, the diameter of the metal detection rod should be less than 0.02 times of the hydraulic diameter of the measurement pipeline.
It should be noted that the sizes and the number of the full pressure measuring point ports and the static pressure measuring point ports are customized according to the size of the smoke duct, and are increased and decreased in proportion.
It should be noted that the distance between the flow straightener and the full pressure measuring unit is 0.25D.
It should be noted that, in practical application, the smoke air volume measuring device is connected with flow correction software, the software system function can realize continuous automatic collection of data of coal volume, load, furnace outlet smoke oxygen volume, furnace outlet smoke temperature, cold air temperature, hot air temperature, smoke temperature, air volume of an air feeder, primary air volume and air volume of an induced draft fan under various working conditions when the boiler operates in real time, the software adopts a neural network method to analyze data accuracy and establish a large database, and the software can establish an intelligent flow analysis model after operating for a long time. The flow data is obtained through software theoretical calculation and self-learning intelligent analysis, and if the deviation between the actually measured data of the flow device and the data exceeds 10%, the deviation of the flow meter measurement can be judged to perform intervention correction.
It should be noted that the calibration method of the revision coefficient of the measuring device adopts the method of measuring the flue gas duct flow rate by using the standard Pitot tube grid on site to calibrate;
the formula for flow measurement at the cross section is:
wherein:
pd-measuring the average dynamic pressure at the cross section;
qv-measuring the flow at the cross section;
a-area of flow measurement cross section;
ρ is the medium density at the flow measurement cross section;
the calculation formula of the medium density ρ at the flow measurement section is:
wherein:
ρodensity of the medium (air and smoke) in a standard state;
pais the atmospheric pressure at the measurement site;
psstatic pressure at the flow measurement section is measured;
t is the medium temperature at the flow measurement cross section.
It should be noted that all the components of the present invention are known in the art, and the components are not specifically described.
The following embodiments of the present invention are given, and it should be noted that the present invention is not limited to the following embodiments, and all the equivalent transformations made on the basis of the technical solution of the present application all fall into the protection scope of the present invention.
Example 1:
the embodiment provides an airflow disturbance-preventing smoke and air volume measuring device, which comprises a smoke and air pipeline 1, wherein a flow straightener 2, a full pressure measuring unit 3 and a static pressure measuring unit 4 are sequentially arranged in the smoke and air pipeline 1 along the airflow direction, as shown in fig. 1 to 4;
the flow straightener 2 comprises flow speed correction units 201 uniformly arranged along the airflow direction, each flow speed correction unit 201 comprises blades 202 arranged along a plurality of directions, and an air inlet pipe 203 parallel to the airflow direction is formed by three adjacent blades 202;
the full-pressure measuring unit 3 comprises a full-pressure stabilizing collecting pipe 301 which is vertical to the airflow direction and is parallel to the top of the smoke and air pipeline 1, the upper side of the full-pressure stabilizing collecting pipe 301 is communicated with one end of a full-pressure transmitting pipe 302 which penetrates through the smoke and air pipeline 1, the other end of the full-pressure transmitting pipe 302 is connected with the differential pressure measuring element 5, and a full-pressure measuring pipe group 303 is fixedly and communicatively mounted on the lower side of the full-pressure stabilizing collecting pipe 301;
the static pressure measuring unit 4 comprises a static pressure stabilizing collecting pipe 401 which is vertical to the airflow direction and is parallel to the top of the smoke and air pipeline 1, the upper side of the static pressure stabilizing collecting pipe 401 is communicated with one end of a static pressure transmitting pipe 402 which penetrates through the smoke and air pipeline 1, the other end of the static pressure transmitting pipe 402 is connected with a differential pressure measuring element 5, and a static pressure measuring pipe group 403 is fixedly and communicatively mounted on the lower side of the static pressure stabilizing collecting pipe 401;
the full-pressure measuring pipe group 303 comprises a plurality of full-pressure measuring pipes 304 with different lengths, and the tail end of each full-pressure measuring pipe 304 is provided with a full-pressure measuring point port 305; the static pressure measuring tube group 403 comprises a plurality of static pressure measuring tubes 404 with different lengths, and the tail end of each static pressure measuring tube 404 is provided with a static pressure measuring point port 405;
the full pressure point port 305 is aligned with the direction of the air flow; the static pressure test port 405 faces away from the direction of airflow.
As a preferable mode of this embodiment, the inclination angle of the total pressure point port 305 with respect to the airflow direction is 45 ° to 60 °; the inclination angle of the static pressure measuring point port 405 relative to the airflow direction is 30-60 degrees; the full-pressure measuring tube and the static pressure measuring tube which are different in length are arranged, and further the full-pressure measuring point ports and the static pressure measuring point ports which are different in height are arranged, so that the flow of flue gas entering from the air inlet tubes which are different in height can be measured, the measuring efficiency can be improved, the arrangement of the full-pressure measuring point ports and the static pressure measuring point ports as the inclination angles ensures that dust in the flue gas has a buffer before entering the full-pressure measuring tube and the static pressure measuring tube, the dust can be settled in the period, and the full-pressure measuring tube and the static pressure measuring tube are not blocked after long-term measurement.
As a preferable scheme of this embodiment, the total-pressure measuring tube set 303 and the static-pressure measuring tube set 403 are both provided with a plurality of total-pressure measuring tube sets and static-pressure measuring tube sets, that is, a plurality of total-pressure measuring point ports and static-pressure measuring point ports are provided, so that the flue gas from the flow straightener has the total-pressure measuring point ports at corresponding positions, and the measurement accuracy is improved.
As a preferred scheme of this embodiment, the total-pressure measuring tube 304 and the static-pressure measuring tube 404 are both metal detecting rods, mainly because the metal material has the characteristics of corrosion resistance, difficult oxidation and the like, the service life of the device can be prolonged, and the accuracy of the measured data is also ensured.
As a preferable scheme of this embodiment, there are a plurality of flow rate correction units 201, the airflow direction in the smoke and air duct is disordered, and the more flow rate correction units, the faster the airflow direction is corrected, and the efficiency of measurement is improved.
The utility model discloses a working process as follows:
when flue gas airflow enters a flue gas airflow measuring device of a flue gas pipeline, the flue gas airflow firstly enters a flow straightener 2, a flow velocity correction unit 201 in the flow straightener 2 changes disordered airflow into the same horizontal direction, then the flue gas enters a full pressure measuring unit 3, the flue gas enters a full pressure measuring pipe 304 from a full pressure measuring point port 305 which is uniformly distributed, the full pressure measuring pipe 304 transmits the measured pressure to a differential pressure measuring element 5 through a full pressure transmitting pipe 302, then the flue gas reaches a static pressure measuring unit 4 in the same way, the flue gas enters a static pressure measuring pipe 404 from a static pressure measuring point port 405 which is uniformly distributed, and the static pressure measuring pipe 404 transmits the measured pressure to the differential pressure measuring element 5 through the static pressure transmitting pipe 402.
Claims (5)
1. A smoke and air quantity measuring device capable of preventing air flow disturbance comprises a smoke and air pipeline (1) and is characterized in that a flow straightener (2), a full pressure measuring unit (3) and a static pressure measuring unit (4) are sequentially installed in the smoke and air pipeline (1) along the air flow direction;
the flow straightener (2) comprises flow speed correction units (201) which are uniformly arranged along the airflow direction, each flow speed correction unit (201) comprises blades (202) which are arranged along a plurality of directions, and an air inlet pipe (203) which is parallel to the airflow direction is formed by three adjacent blades (202);
the full-pressure measurement unit (3) comprises a full-pressure-stabilizing collecting pipe (301) which is vertical to the airflow direction and is parallel to the top of the smoke and air pipeline (1), the upper side of the full-pressure-stabilizing collecting pipe (301) is communicated with one end of a full-pressure-transmitting pipe (302) which penetrates through the smoke and air pipeline (1), the other end of the full-pressure-transmitting pipe (302) is connected with a differential pressure measurement element (5), and a full-pressure measurement pipe group (303) is fixedly and communicated and installed on the lower side of the full-pressure-stabilizing collecting pipe (301);
the static pressure measuring unit (4) comprises a static pressure stabilizing collecting pipe (401) which is vertical to the airflow direction and is parallel to the top of the smoke and air pipeline (1), the upper side of the static pressure stabilizing collecting pipe (401) is communicated with one end of a static pressure transmitting pipe (402) which penetrates through the smoke and air pipeline (1), the other end of the static pressure transmitting pipe (402) is connected with a differential pressure measuring element (5), and a static pressure measuring pipe group (403) is fixedly and communicated and installed on the lower side of the static pressure stabilizing collecting pipe (401);
the full-pressure measuring pipe group (303) comprises a plurality of full-pressure measuring pipes (304) with different lengths, and the tail end of each full-pressure measuring pipe (304) is provided with a full-pressure point port (305); the static pressure measuring pipe group (403) comprises a plurality of static pressure measuring pipes (404) with different lengths, and the tail end of each static pressure measuring pipe (404) is provided with a static pressure measuring point port (405);
the full pressure measuring point port (305) is opposite to the airflow direction; the static pressure measuring point port (405) is opposite to the airflow direction.
2. The airflow disturbance prevention smoke volume measuring device according to claim 1, wherein the inclination angle of the full pressure point port (305) with respect to the airflow direction is 45 ° to 60 °; the inclination angle of the static pressure measuring point port (405) relative to the airflow direction is 30-60 degrees.
3. The airflow disturbance prevention smoke air volume measuring device according to claim 1, wherein a plurality of full pressure measuring tube groups (303) and static pressure measuring tube groups (403) are provided.
4. The airflow disturbance prevention smoke air volume measuring device of claim 1, wherein the full pressure measuring tube (304) and the static pressure measuring tube (404) are both metal test rods.
5. The airflow disturbance prevention smoke air volume measuring device according to claim 1, wherein the flow rate correction unit (201) is provided in plurality.
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| CN202022979653.2U CN214308921U (en) | 2020-12-10 | 2020-12-10 | Smoke and air volume measuring device capable of preventing air flow disturbance |
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| CN202022979653.2U CN214308921U (en) | 2020-12-10 | 2020-12-10 | Smoke and air volume measuring device capable of preventing air flow disturbance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023151565A1 (en) * | 2022-02-09 | 2023-08-17 | 付成 | Modular flow measurement method and apparatus, and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023151565A1 (en) * | 2022-02-09 | 2023-08-17 | 付成 | Modular flow measurement method and apparatus, and application |
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