WO2023236513A1

WO2023236513A1 - Processing method for flue gas and air duct measurement section, and flue gas and air duct measurement section

Info

Publication number: WO2023236513A1
Application number: PCT/CN2022/142097
Authority: WO
Inventors: 孙大伟; 郑金; 陈得胜; 高国栋; 闫宏; 石清鑫; 马翔; 李昊燃; 王伯平
Original assignee: 西安热工研究院有限公司
Priority date: 2022-06-08
Filing date: 2022-12-26
Publication date: 2023-12-14
Also published as: CN114838228A

Abstract

Disclosed are a processing method for a flue gas and air duct measurement section (1), and a flue gas and air duct measurement section. The processing method for the flue gas and air duct measurement section comprises the following steps: preparing a flue gas and air duct, wherein the flue gas and air duct comprises a bent pipeline (11) and a straight pipeline (13); preparing a measurement pipeline (12), and connecting the measurement pipeline between the bent pipeline and the straight pipeline, wherein the radial size of the inner wall surface of the measurement pipeline is gradually increased in a direction from the straight pipeline to the bent pipeline; and using one end of the bent pipeline as an air inlet, and using one end of the straight pipeline as an air outlet. The flue gas and air duct measurement section obtained according to the processing method for the flue gas and air duct measurement section is small in internal gas disturbance amplitude and high in measurement precision.

Description

A processing method of a flue duct measuring section and a flue duct measuring section

Cross-references to related applications

This application is filed based on a Chinese patent application with application number 202210642643.0 and a filing date of June 8, 2022, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application as a reference.

Technical field

The present disclosure relates to the technical field of flue duct flow detection, and specifically to a processing method of a flue duct measurement section and a flue duct measurement section.

Background technique

The flow detection points installed on the smoke and air ducts are generally installed on longer straight pipe sections (that is, continuous straight pipe sections of more than 10-20 meters). In related technologies, due to the limited space conditions of thermal power plants, it is difficult to find suitable locations in Long straight pipe section, therefore, install the flow detection point in the straight pipe section after the elbow. The distance between the straight pipe section and the elbow in the related art is small. The gas flow in the straight pipe section is affected by the elbow, which will cause the gas disturbance in the straight pipe downstream of the elbow to be larger, thus causing flow detection. The detection data of the points fluctuate greatly, resulting in low measurement accuracy.

Contents of the invention

The present disclosure aims to solve one of the technical problems in the related art, at least to a certain extent.

To this end, one aspect of the present disclosure proposes a processing method for a flue duct measurement section. The processing method for the flue duct measurement section obtains a flue duct measurement section with small internal gas disturbance amplitude and high measurement accuracy.

Another aspect of the present disclosure also provides a smoke duct measurement section.

The processing method of the flue duct measuring section according to the embodiment of the first aspect of the present disclosure includes the following steps: preparing the flue duct, wherein the flue duct includes a curved pipe and a straight pipe; preparing a detection pipe, and the detection pipe Connected between the curved pipe and the straight pipe, the radial size of the inner wall of the detection pipe gradually increases in the direction in which the straight pipe points to the curved pipe; One end is used as the air inlet, and one end of the straight pipe is used as the air outlet.

In the processing method of the flue duct measuring section in the embodiment of the present disclosure, the detection pipe is connected between the curved pipe and the straight pipe. When the test gas is introduced through one end of the curved pipe, the test gas can pass through the curved pipe, For detection pipelines and straight pipelines, since the radial size of the inner wall of the detection pipeline gradually increases in the direction from the straight pipeline to the curved pipeline, the gas disturbance amplitude in the detection pipeline is small, thereby ensuring the detection accuracy of the flow detection component. .

Therefore, the flue duct measurement section obtained through the processing method of the flue duct measurement section according to the embodiment of the present disclosure has small internal gas disturbance amplitude and high measurement accuracy.

In some embodiments, the method further includes the following steps: arranging a plurality of wind speed detectors arranged at intervals along the circumference in the detection pipe; passing in the detection gas, and using the wind speed detector to detect the gas flow rate value in the detection pipe; according to The gas flow rate value is used to obtain the maximum gas flow rate value and the minimum gas flow rate value in the detection pipeline, wherein when the difference between the maximum gas flow rate value and the minimum gas flow rate value is greater than the first preset value, the value increases The angle between the inner wall surface of the detection pipe and the center line of the detection pipe is such that the difference between the maximum gas flow rate value and the minimum gas flow rate value is less than or equal to the first preset value.

In some embodiments, when the difference between the maximum gas flow rate value and the minimum gas flow rate value is greater than the first preset value, the detection pipe is replaced to increase the distance between the inner wall surface of the detection pipe and the center line of the detection pipe. angle.

In some embodiments, the following step is further included: installing a flow detection component on the detection pipeline.

According to the flue duct measurement section of the embodiment of the second aspect of the present disclosure, the flue duct measurement section includes a curved pipe, a detection pipe and a straight pipe connected in sequence, and the inner wall surface of the detection pipe is in contact with the detection pipe. The angle between the center lines is greater than 0 degrees and less than or equal to 15 degrees. The flue duct measurement section also includes a flow detection component, and the flow detection component is provided on the detection pipe.

In some embodiments, the radial size of the inner wall of the detection pipe gradually increases in the direction from the straight pipe to the curved pipe.

In some embodiments, the detection pipeline further includes a plurality of mounting holes, the plurality of installation holes are arranged at intervals along the circumference of the detection pipeline, and there are a plurality of flow detection components, and a plurality of the flow detection components In one-to-one correspondence with the plurality of mounting holes, the flow detection assembly includes a mounting section and a detection section, the installation section is cooperatively installed in the installation hole, and the detection section is located in the detection pipe.

In some embodiments, the installation section of the flow detection component cooperates with the installation hole to fix the flow detection component; the detection section is located in the detection pipeline.

In some embodiments, the detection pipeline further includes a plurality of blocking components, the plurality of blocking components correspond to the plurality of installation holes, and the blocking components include an annular base and an annular base. A detachably connected cover, the annular base is connected to the outer wall of the detection pipe, and one of the annular bases surrounds one of the installation holes, at least part of the installation section passes through the installation hole, and the The mounting section is rotatably or movably fitted within the annular base.

In some embodiments, the angle formed between the axis of the detection section and the centerline of the detection pipeline is greater than 0 degrees and less than 15 degrees.

In some embodiments, the flow detection component is a pitot tube, the axial extension direction of the installation section is perpendicular to the axial extension direction of the detection section, and the detection section extends in a direction close to the elbow section.

In some embodiments, the number of the flow detection components is an even number, and the spacing distance between the plurality of flow detection components is greater than or equal to 300 mm and less than or equal to 400 mm.

In some embodiments, the detection section is provided with a measurement hole, so that the gas in the detection pipe passes through the detection hole into the flow detection component; when the installation section is rotated, the flow detection component The detection sections rotate simultaneously.

In some embodiments, the angle formed between the axis of the detection section and the centerline of the detection pipeline is equal to 0.

In some embodiments, the flue duct measurement section is obtained by the processing method according to any one of the above embodiments of the first aspect.

Description of the drawings

Figure 1 is a schematic structural diagram of a flue duct measurement section according to an embodiment of the present disclosure.

Figure 2 is a simulation diagram of the flow velocity in the smoke duct in the related art.

Figure 3 is a flow velocity simulation diagram in the flue duct measurement section according to the embodiment of the present disclosure.

Figure 4 is a schematic diagram of the blocking assembly of the flue duct measurement section according to the embodiment of the present disclosure.

Figure 5 is a partial structural schematic diagram of the flue duct measurement section according to the embodiment of the present disclosure.

Figure 6 is a schematic diagram of the flow measurement component of the flue duct measurement section according to the embodiment of the present disclosure.

Reference signs:

Smoke duct measurement section 1; curved pipe 11; detection pipe 12; mounting hole 121; blocking component 122; annular base 1221; cover 1222; flow detection component 123; installation section 1231; detection section 1232; straight pipe 13.

Detailed ways

The embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present disclosure and are not to be construed as limitations of the present disclosure.

As shown in Figure 1, the flue duct measurement section 1 of the embodiment of the present disclosure includes a curved pipe 11, a detection pipe 12 and a straight pipe 13 connected in sequence.

The angle between the inner wall surface of the detection duct 12 and the center line of the detection duct 12 is greater than 0 degrees and less than or equal to 15 degrees. The flue duct measurement section 1 also includes a flow detection component 123. The flow detection component 123 is provided on the detection duct 12.

As shown in Figure 2, in the related art, when the gas flows in the pipeline, the gas obviously has a large gas disturbance downstream of the bend, that is, on the same cross section (for example, Contour 2 (Contour 2)) The gas flow velocity (Velocity) has a large difference. Therefore, when detecting the flow rate in the pipeline, the detection data difference is large and the detection accuracy is low. As shown in Figure 3, when gas is introduced into the flue duct measurement section 1 of the embodiment of the present disclosure, flow velocity stratification appears in the detection pipe 12, that is, the difference in gas flow velocity on the same cross-section is small, so when performing flow detection When the detection data is stable, the detection accuracy is improved.

It can be understood that, as shown in Figure 1, the gas in the flue duct measurement section 1 can pass through the curved pipe 11, the detection pipe 12 and the straight pipe 13 in sequence, because the radial size of the detection pipe 12 gradually decreases from top to bottom. If it is small, the difference in gas flow velocity on the same cross-section in the detection pipe 12 is small, which is beneficial to the detection of the flow detection component 123 on the detection pipe 12 and thereby improves the detection accuracy.

It should be noted that the extending direction of the center line of the detection pipe 12 is consistent with the up and down direction as shown in Figure 1 .

In some embodiments, the detection pipeline 12 further includes a plurality of installation holes 121 , which are arranged at intervals along the circumference of the detection pipeline 12 . There are multiple flow detection components 123 , and the multiple flow detection components 123 are connected with multiple installation holes. The holes 121 correspond one to one. The flow detection component 123 includes an installation section 1231 and a detection section 1232. The installation section 1231 is installed in the installation hole 121 and the detection section 1232 is located in the detection pipe 12.

In some embodiments, as shown in FIGS. 4-6 , the mounting hole 121 is used to install the flow detection component 123 , that is, the mounting section 1231 of the flow detection component 123 can cooperate with the mounting hole 121 to fix the flow detection component 123 . The detection section 1232 is located in the detection pipeline 12 , that is, the detection section 1232 is used to detect the gas flow rate in the detection section 1232 , and can also record and transmit the detection information.

It can be understood that, as shown in Figure 6, the gas flow rates on the same cross-section in the detection section 1232 have a certain flow rate difference, that is, due to the disturbance effect of the gas, the gas flow rates on the same cross-section will also have a difference. Then, by arranging multiple flow detection components 123 on the detection duct 12, multiple sets of data can be measured at the same time for comparison, so that a more accurate air flow rate can be obtained, further improving the detection of the flue duct measurement section 1 according to the embodiment of the present disclosure. Accuracy.

In some embodiments, the detection pipeline 12 also includes a plurality of blocking components 122, which correspond to the plurality of installation holes 121. The blocking components 122 include an annular base 1221 and are detachably connected to the annular base 1221. The cover 1222, the annular base 1221 is connected to the outer wall of the detection pipe 12, and an annular base 1221 surrounds a mounting hole 121, at least part of the mounting section 1231 passes through the mounting hole 121, and the mounting section 1231 is rotatable or moveable Fitted in the annular base 1221.

It can be understood that, as shown in FIGS. 4 and 5 , the annular base 1221 and the outer wall surface of the detection pipe 12 can be connected by welding. Of course, they can also be connected in other ways, or the detection pipe 12 and the annular base 1221 can be connected. One piece. The cover 1222 and the annular base 1221 can be connected through sealing, that is, the inner circumferential surface of the annular base 1221 and the outer circumferential surface of the cover 1222 are both provided with threads. This prevents gas leakage in the detection pipe 12 when the cover 1222 is connected to the annular base 1221 .

Depending on the size of the detection pipe 12, different sizes of flow detection components 123 can be selected, and the size of the installation section 1231 of the flow detection component 123 will also be different. When the size of the installation section 1231 is smaller, the installation section 1231 can be completely installed in the installation hole 121 inside, that is, the outer wall surface of the installation section 1231 is in contact with the wall surface of the installation hole 121 , or if the size of the installation section 1231 is larger, part of the installation section 1231 can be installed in the installation hole 121 .

In addition, as shown in Figures 3-6, due to different gas flow rates on the same cross-section, the detection data of multiple flow detection components 123 will deviate. Then the flow detection can be changed by rotating or moving the installation section 1231. The assembly 123 detects the position of segment 1232.

In some embodiments, the number of flow detection components 123 is an even number, and the spacing distance between multiple flow detection components 123 is greater than or equal to 300 mm and less than or equal to 400 mm.

It can be understood that in order to enhance the overall strength of the pipeline, cross-shaped support rods are often installed in the pipeline. If an odd number of flow detection components 123 are used, the flow detection component 123 in the middle will be blocked by the support rods, which will cause Affects the detection result, therefore, the number of flow detection components 123 is an even number.

In some embodiments, the angle formed between the axis of the detection section 1232 and the centerline of the detection pipe 12 is greater than 0 degrees and less than 15 degrees.

It can be understood that the detection section 1232 is provided with a measurement hole, and the gas in the detection pipe 12 can pass into the flow detection component 123 through the detection hole, thereby realizing the detection function. When the installation section 1231 is rotated, the detection section 1232 of the flow detection assembly 123 rotates at the same time, causing the position of the detection hole to shift, so that the flow velocity at different locations can be detected.

In some embodiments, the angle formed between the axis of the detection section 1232 and the centerline of the detection pipe 12 is equal to zero.

In some embodiments, the flow detection component 123 is a pitot tube, the axial extension direction of the installation section 1231 is perpendicular to the axial extension direction of the detection section 1232, and the detection section 1232 extends in a direction close to the elbow section.

It should be noted that, as shown in FIG. 6 , the flow detection component 123 is generally L-shaped. When installing the flow detection component 123 , a blocking component 122 of an appropriate size needs to be selected to facilitate the installation of the flow detection component 123 . For example, if a standard pitot tube with a flow coefficient of 1.0 is used, a blocking component 122 with a thickness of 3 mm, a diameter of 80 mm, and a height h greater than or equal to 20 mm and less than or equal to 35 mm can be selected.

The processing method of the flue duct measurement section in the embodiment of the present disclosure is described below.

The processing method of the flue duct measurement section in the embodiment of the present disclosure includes the following steps:

Prepare the flue duct, which includes curved ducts and straight ducts. Prepare the detection pipe, connect the detection pipe between the curved pipe and the straight pipe, and the radial size of the inner wall of the detection pipe gradually increases in the direction of the straight pipe pointing to the curved pipe. Use one end of the curved pipe as the air inlet and one end of the straight pipe as the air outlet.

It can be understood that when the detection pipe is connected between the curved pipe and the straight pipe, when the test gas is introduced through one end of the curved pipe, the test gas can pass through the curved pipe, the detection pipe and the straight pipe in sequence. Since the detection pipe The radial size of the inner wall surface gradually increases in the direction from the straight pipe to the curved pipe. Therefore, the gas disturbance amplitude in the detection pipe is small, thereby ensuring the detection accuracy of the flow detection component.

In some embodiments, the processing method of the flue duct measurement section of the embodiment of the present disclosure further includes the following steps: arranging a plurality of wind speed detectors arranged at intervals along the circumferential direction in the detection duct. Introduce the detection gas and use the wind speed detector to detect the gas flow rate value in the detection tube. According to the gas flow velocity value, the maximum gas flow velocity value and the minimum gas flow velocity value in the detection pipeline are obtained. When the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is greater than the first preset value, increase the distance between the inner wall of the detection pipeline and the detection pipeline. The angle between the center lines is such that the difference between the maximum gas flow rate value and the minimum gas flow rate value is less than or equal to the first preset value.

It can be understood that after connecting the curved pipe, the detection pipe and the straight pipe in sequence, the test gas can be introduced into one end of the curved pipe and ensure that the test gas is basically consistent with the gas flow rate in the industrial pipe. Use the wind speed detector Carry out wind speed detection to verify the wind speed in the detection pipeline. Among them, the first preset value is the theoretical gas flow rate value on the same cross-section in the detection pipeline. If the difference between the maximum gas flow rate value and the minimum gas flow rate value is greater than the first preset value, it means that the theoretical gas flow rate value on the same cross-section in the detection pipeline is The gas flow rate values vary greatly.

In some embodiments, when the difference between the maximum gas flow rate value and the minimum gas flow rate value is greater than the first preset value, the detection pipe is replaced to increase the angle between the inner wall surface of the detection pipe and the center line of the detection pipe.

It can be understood that when the difference between the maximum gas flow rate value and the minimum gas flow rate value is greater than the first preset value, the gas flow rate value on the same cross-section in the detection pipeline has a large difference, and the distance between the inner wall of the detection pipeline and the detection pipeline can be increased. The angle between the center lines is such that the difference between the maximum gas flow rate value and the minimum gas flow rate value is less than the first preset value.

In some embodiments, the processing method of the flue duct measurement section of the embodiment of the present disclosure further includes the following steps: installing a flow detection component on the detection pipe.

That is to say, increase the angle between the inner wall of the detection pipe and the center line of the detection pipe, and verify again that the difference between the maximum gas flow rate value and the minimum gas flow rate value in the detection pipe is less than the first preset value, which means that the smoke wind The measuring section can be used to meet the needs of industrial pipelines. Finally, a flow detection component is installed on the detection pipe to ensure the measurement accuracy of the flue duct measurement section processed by this processing method.

It should be noted that the flue duct measurement section 1 of the embodiment of the present disclosure is processed using this processing method.

In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis", The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply the referred devices or elements. Must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations on the disclosure.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In this disclosure, unless otherwise explicitly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be mechanically connected, electrically connected or communicable with each other; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements, Unless otherwise expressly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

In this disclosure, unless otherwise expressly stated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features may be in indirect contact through an intermediary. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" or the like mean that a particular feature, structure, material, or other feature is described in connection with the embodiment or example. Features are included in at least one embodiment or example of the disclosure. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

Although the above embodiments have been shown and described, it can be understood that the above embodiments are illustrative and should not be construed as limitations of the present disclosure. Changes, modifications, substitutions and modifications of the above embodiments may be made by those of ordinary skill in the art. All are within the protection scope of this disclosure.

Claims

A processing method for a flue duct measurement section, including:

Prepare a flue duct, wherein the flue duct includes a curved duct and a straight duct;

Prepare a detection pipeline and connect the detection pipeline between the curved pipeline and the straight pipeline. The radial size of the inner wall of the detection pipeline gradually increases in the direction in which the straight pipeline points to the curved pipeline. big;

One end of the curved pipe is used as an air inlet, and one end of the straight pipe is used as an air outlet.
The processing method of the flue duct measurement section according to claim 1, further comprising:

A plurality of wind speed detectors arranged at intervals along the circumferential direction are provided in the detection pipe;

Pass in the detection gas, and use the wind speed detector to detect the gas flow speed value in the detection tube;

According to the gas flow rate value, the maximum gas flow rate value and the minimum gas flow rate value in the detection pipeline are obtained, wherein when the difference between the maximum gas flow rate value and the minimum gas flow rate value is greater than the first preset value, the value is increased. The angle between the inner wall surface of the detection pipe and the center line of the detection pipe is increased so that the difference between the maximum gas flow rate value and the minimum gas flow rate value is less than or equal to the first preset value.
The processing method of the flue duct measurement section according to claim 2, wherein when the difference between the maximum gas flow rate value and the minimum gas flow rate value is greater than the first preset value, the detection pipe is replaced to increase the The angle between the inner wall surface of the detection pipeline and the center line of the detection pipeline.
The processing method of the flue duct measurement section according to claim 3, further comprising: installing a flow detection component on the detection pipe.
A smoke duct measurement section includes:

The curved pipe, the detection pipe and the straight pipe are connected in sequence; wherein the angle between the inner wall surface of the detection pipe and the center line of the detection pipe is greater than 0 degrees and less than or equal to 15 degrees, and the flue duct measurement section also includes A flow detection component is provided on the detection pipeline.
The flue duct measurement section according to claim 5, wherein the radial size of the inner wall surface of the detection pipe gradually increases in the direction in which the straight pipe points to the curved pipe.
The flue duct measurement section according to claim 5 or 6, wherein the detection duct further includes a plurality of mounting holes, and the plurality of mounting holes are arranged at intervals along the circumference of the detection duct,

There are multiple flow detection assemblies, and the multiple flow detection assemblies correspond to the plurality of installation holes one by one. The flow detection assembly includes a mounting section and a detection section, and the installation section is cooperatively installed in the installation hole. Within, the detection section is located in the detection pipeline.
The flue duct measurement section according to claim 7, wherein the installation section of the flow detection component cooperates with the installation hole to fix the flow detection component; the detection section is located in the detection pipe .
The flue duct measurement section according to claim 7, wherein the detection duct further includes a plurality of blocking components, and the plurality of blocking components correspond to the plurality of mounting holes one by one, and the blocking components It includes an annular base and a cover that is detachably connected to the annular base. The annular base is connected to the outer wall of the detection pipe, and one of the annular bases surrounds one of the installation holes. At least part of the installation section Passing through the mounting hole, the mounting section is rotatably or movably fitted within the annular base.
The flue duct measurement section according to claim 9, wherein the angle formed between the axis of the detection section and the center line of the detection pipe is greater than 0 degrees and less than 15 degrees.
The flue duct measurement section according to claim 9, wherein the flow detection component is a pitot tube, the axis extension direction of the installation section is perpendicular to the axis extension direction of the detection section, and the detection section is along the Extends in a direction close to the bent pipe section.
The flue duct measurement section according to claim 5, wherein the number of the flow detection components is an even number, and the spacing distance between the plurality of flow detection components is greater than or equal to 300 mm and less than or equal to 400 mm.
The flue duct measurement section according to claim 7, wherein the detection section is provided with a measurement hole so that the gas in the detection pipe passes through the detection hole into the flow detection assembly; when the detection section is rotated When installing the section, the detection section of the flow detection assembly rotates at the same time.
The flue duct measurement section according to claim 7, wherein the angle formed between the axis of the detection section and the center line of the detection duct is equal to 0.
The flue duct measurement section according to claim 5, characterized in that the flue duct measurement section is obtained by the processing method according to any one of claims 1-4.