Smoke Duct Measuring Device and Processing Method of Smoke Duct Measuring Device

Abstract

The present invention proposes a smoke duct measuring device and a processing method for the smoke duct measuring device. The processing method of the smoke duct measuring device includes the steps of preparing a smoke duct composed of a curved duct and a straight duct, and connecting a detection duct between the curved duct and the straight duct. The radial dimension of the inner wall surface of the detection duct is prepared such that it gradually increases in the direction in which the straight duct faces the curved duct. One end of the curved duct is used as an air inlet, and one end of the straight duct is used as an air outlet. The smoke duct measuring device obtained by the processing method of the smoke duct measuring device of the present invention has the advantage of high measurement accuracy because the perturbation width of the internal gas is small.

Description

Technical Field

[0001] Cross - reference to related applications This application is filed based on the Chinese patent application with application number 202210642642.0 and filing date of June 8, 2022, claims the priority of the Chinese application, and all the contents of the Chinese patent application are incorporated herein by reference. The present invention relates to the technical field of detecting the flow rate of a smoke duct, and in particular, to a smoke duct measuring device and a processing method of the smoke duct measuring device.

Background Art

[0002] The flow rate detection point attached to the exhaust gas duct is generally attached to a long straight pipe section (that is, a continuous straight pipe section of 10 - 20m or more). However, in the related art, due to the limited space conditions of the thermal power plant, it is difficult to require a long straight pipe section. Therefore, the flow rate detection point is attached to the straight pipe section behind the elbow. The distance between the straight pipe section and the elbow in the related art is short, and the gas flow in the straight pipe section is affected by the elbow. Therefore, the perturbation amplitude of the gas in the straight pipe downstream of the elbow becomes large, resulting in large fluctuations in the detection data of the flow rate detection point and low measurement accuracy.

Summary of the Invention

Problems to be Solved by the Invention

[0003] An object of the present invention is to solve at least to some extent one of the technical problems in the related art.

[0004] Therefore, in one aspect of the present invention, a processing method of a smoke duct measuring device is proposed. The smoke duct measuring device obtained by this processing method of the smoke duct measuring device has the advantage of high measurement accuracy because the perturbation amplitude of the internal gas is small.

[0005] In another aspect of the present invention, a smoke duct measuring device is further proposed.

[0006] The processing method of the smoke duct measuring device according to the embodiment of the first aspect of the present invention includes the steps of preparing a smoke duct composed of a curved duct and a straight duct, and connecting the detection duct between the curved duct and the straight duct, wherein the radial dimension of the inner wall surface of the detection duct is such that the detection duct is prepared so as to gradually increase in the direction in which the straight duct faces the curved duct. One end of the curved duct is used as an air inlet, and one end of the straight duct is used as an air outlet.

[0007] The processing method of the smoke duct measuring device according to the embodiment of the present invention includes connecting a detection duct between a curved duct and a straight duct. When passing a test gas through one end of the curved duct, the test gas can pass through the curved duct, the detection duct, and the straight duct in sequence. Since the radial dimension of the inner wall surface of the detection duct gradually increases in the direction in which the straight duct faces the curved duct, the perturbation width of the gas in the detection duct becomes smaller, and the detection accuracy of the flow rate detection member can be ensured.

[0008] Thereby, the smoke duct measuring device obtained by the processing method of the smoke duct measuring device according to the embodiment of the present invention has a small perturbation width of the internal gas and high measurement accuracy.

[0009] In some embodiments, the processing method further includes the steps of providing a plurality of wind speed detectors arranged at intervals along the circumferential direction in the detection duct, introducing a detection gas, and using the wind speed detectors to detect the gas flow velocity value in the detection duct, and obtaining the maximum gas flow velocity value and the minimum gas flow velocity value in the detection duct based on the gas flow velocity value. Here, when the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is greater than a first set value, the included angle between the inner wall surface of the detection duct and the center line of the detection duct is increased so that the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is equal to or less than the first set value.

[0010] In some embodiments, when the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is greater than a first set value, the detection duct is replaced so that the angle between the inner wall surface of the detection duct and the center line of the detection duct increases.

[0011] In some embodiments, it further includes the step of attaching a flow rate detection member to the detection duct.

[0012] The smoke duct measurement device according to an embodiment of the second aspect of the present invention is composed of a curved duct, a detection duct, and a straight duct connected in sequence. The angle between the inner wall surface of the detection duct and the center line of the detection duct is greater than 0 degrees and less than or equal to 15 degrees. The smoke duct measurement device further includes a flow rate detection member provided in the detection duct.

[0013] In some embodiments, the radial dimension of the inner wall surface of the detection duct gradually increases in the direction in which the straight duct faces the curved duct.

[0014] In some embodiments, the detection duct further includes a plurality of mounting holes arranged at intervals along the circumferential direction of the detection duct. There are a plurality of the flow rate detection members. The plurality of flow rate detection members correspond one-to-one with the plurality of mounting holes. The flow rate detection member includes a mounting portion fitted and mounted in the mounting hole and a detection portion located within the detection duct.

[0015] In some embodiments, the mounting portion of the flow rate detection member fits into the mounting hole to fix the flow rate detection member, and the detection portion is arranged within the detection duct.

[0016] In some embodiments, the detection duct further comprises a plurality of sealing members. The plurality of sealing members correspond one-to-one with the plurality of mounting holes. The sealing member comprises an annular base and a cover detachably connected to the annular base. The annular base is connected to the outer wall surface of the detection duct. One annular base surrounds one mounting hole. At least a part of the mounting portion passes through the mounting hole, and the mounting portion is rotatably or movably fitted inside the annular base.

[0017] In some embodiments, the angle formed between the axis of the detection portion and the center line of the detection duct is greater than 0 degrees and less than 15 degrees.

[0018] In some embodiments, the flow rate detection member is a Pitot duct. The axis of the mounting portion extends in a direction perpendicular to the direction in which the axis of the detection portion extends. The detection portion extends along the direction close to the elbow portion.

[0019] In some embodiments, the number of the flow rate detection members is an even number, and the distance between the plurality of flow rate detection members is 300 mm or more and 400 mm or less.

[0020] In some embodiments, a measurement hole is provided in the detection portion so that the gas in the detection duct enters the flow rate detection member through the detection hole. When the mounting portion is rotated, the detection portion of the flow rate detection member rotates simultaneously.

[0021] In some embodiments, the angle formed between the axis of the detection portion and the center line of the detection duct is equal to 0.

[0022] In some embodiments, the smoke duct measuring device is obtained by the processing method according to any one of the first embodiments.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0024] Hereinafter, embodiments of the present invention will be described in detail, and examples of the embodiments are shown in the accompanying drawings. It should be noted that the embodiments described below with reference to the accompanying drawings are examples for explaining the present invention and should not be understood as limiting the present invention.

[0025] As shown in FIG. 1, the smoke duct measuring device 1 according to an embodiment of the present invention is composed of a curved duct 11, a detection duct 12, and a straight duct 13 connected in sequence.

[0026] The included 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, and the smoke duct measuring device 1 further includes a flow rate detection member 123 provided in the detection duct 12.

[0027] As shown in FIG. 2, the inventors of the present invention found that in the related art, when gas flows in a duct, a significant gas perturbation phenomenon clearly appears on the downstream side of the gas at the bent portion, that is, the difference in gas velocity in the same cross-section (for example, the controller 2 (outline 2)) is large. Therefore, when measuring the flow rate in this duct, a large difference occurs in the detection data, resulting in low detection accuracy. As shown in FIG. 3, when gas is introduced into the smoke duct measuring device 1 according to an embodiment of the present invention, stratification of the flow velocity appears inside the detection duct 12, that is, the difference in gas velocity in the same cross-section becomes small. Then, when the flow rate is detected, the detection data becomes stable, so the detection accuracy is improved.

[0028] As shown in FIG. 1, the gas in the smoke duct measuring device 1 can pass through the curved duct 11, the detection duct 12, and the straight duct 13 in sequence. As the radial dimension of the detection duct 12 gradually decreases from top to bottom, the difference in gas velocity in the same cross-section inside the detection duct 12 becomes small. Therefore, it becomes easier to detect the flow rate detection member 123 in the detection duct 12, and the detection accuracy is improved.

[0029] Note that the direction in which the center line of the detection duct 12 extends coincides with the vertical direction as shown in FIG. 1.

[0030] In some embodiments, the detection duct 12 further includes a plurality of mounting holes 121 arranged at intervals along the circumferential direction of the detection duct 12, a plurality of flow rate detection members 123 that correspond one-to-one with the plurality of mounting holes 121 and include a mounting portion 1231 and a detection portion 1232, a mounting portion 1231 fitted and mounted in the mounting hole 121, and a detection portion 1232 located inside the detection duct 12.

[0031] In some embodiments, as shown in FIGS. 4 to 6, the mounting hole 121 is used to mount the flow rate detection member 123. That is, the mounting portion 1231 of the flow rate detection member 123 can be fixed by fitting into the mounting hole 121. The detection portion 1232 is located inside the detection duct 12 to detect the flow velocity of the gas in the detection portion 1232, and can record and transmit detection information.

[0032] As shown in FIG. 6, when there is a certain flow velocity difference in the gas flow velocity in the same cross-section within the detection portion 1232, that is, when a difference occurs in the gas flow velocity in the same cross-section due to the perturbation effect of the gas, by providing a plurality of flow rate detection members 123 on the detection duct 12, a plurality of data sets can be measured simultaneously for comparison. Therefore, a more accurate air flow velocity can be obtained, and the detection accuracy of the smoke duct measuring device 1 according to the embodiment of the present invention can be further improved.

[0033] In some embodiments, the detection duct 12 further includes a plurality of sealing members 122 that correspond one-to-one to the plurality of mounting holes 121. The sealing member 122 includes an annular base 1221 and a cover 1222 detachably connected to the annular base 1221. The annular base 1221 is connected to the outer wall surface of the detection duct 12 and surrounds one mounting hole 121. At least a part of the mounting portion 1231 passes through the mounting hole 121, and the mounting portion 1231 is fitted rotatably or movably inside the annular base 1221.

[0034] As shown in FIGS. 4 and 5, the annular base 1221 may be connected to the outer wall surface of the detection duct 12 by a welding method. Of course, it may be connected by other methods, or it can be understood that the detection duct 12 and the annular base 1221 may be integrally formed. The cover 1222 and the annular base 1221 may be connected by a seal. That is, threads are provided on both the inner peripheral surface of the annular base 1221 and the outer peripheral surface of the cover 1222. Therefore, when the cover 1222 is connected to the annular base 1221, gas leakage in the detection duct 12 is prevented.

[0035] According to the dimensions of the detection duct 12, flow rate detection members 123 with different dimensions can be selected. The dimensions of the attachment portions 1231 of the flow rate detection members 123 are also different. When the dimension of the attachment portion 1231 is small, the attachment portion 1231 can be completely attached inside the attachment hole 121. That is, the outer wall surface of the attachment portion 1231 contacts the wall surface of the attachment hole 121. Or, when the dimension of the attachment portion 1231 is large, a part of the attachment portion 1231 can be attached inside the attachment hole 121.

[0036] Also, as shown in FIGS. 3 to 6, when a deviation appears in the detection data of the plurality of flow rate detection members 123 due to different gas flow velocities in the same cross section, the position of the detection portion 1232 of the flow rate detection member 123 can be changed by rotating or moving the attachment portion 1231.

[0037] In some embodiments, the number of the flow rate detection members 123 is an even number, and the distance between the plurality of flow rate detection members 123 is 300 mm or more and 400 mm or less.

[0038] In order to increase the overall strength of the duct, a cross-shaped support bar is often installed in the duct. When an odd number of flow rate detection members 123 are used, the flow rate detection member 123 at the middle position is blocked by the support bar, which further affects the detection result. Therefore, it can be understood that the number of the flow rate detection members 123 is an even number.

[0039] In some embodiments, the angle formed between the axis of the detection portion 1232 and the center line of the detection duct 12 is greater than 0 degree and less than 15 degrees.

[0040] It can be understood that the detection unit 1232 is provided with detection holes so that the gas in the detection duct 12 is introduced into the flow rate detection member 123 through the detection holes to realize the detection function. When the attachment part 1231 is rotated, the detection part 1232 of the flow rate detection member 123 is rotated simultaneously, and the position of the detection hole is shifted, so that the flow velocities at different positions can be detected.

[0041] In some embodiments, the angle formed between the axis of the detection unit 1232 and the center line of the detection duct 12 is equal to 0.

[0042] In some embodiments, the flow rate detection member 123 is a Pitot duct, the axis of the attachment part 1231 extends in a direction orthogonal to the direction in which the axis of the detection part 1232 extends, and the detection part 1232 extends along the direction close to the elbow part.

[0043] As shown in FIG. 6, the flow rate detection member 123 is substantially L-shaped. When attaching the flow rate detection member 123, it should be noted that it is necessary to select a sealing member 122 with an appropriate size to facilitate the attachment of the flow rate detection member 123. For example, when using a standard Pitot duct with a flow coefficient of 1.0, a sealing member 122 with a thickness of 3 mm, a diameter of 80 mm, and a height h of 20 mm or more and 35 mm or less can be selected.

[0044] Hereinafter, a processing method of a smoke duct measuring device according to an embodiment of the present invention will be described.

[0045] The processing method of the smoke duct measuring device in the embodiment of the present invention is preparing a smoke duct composed of a curved duct and a straight duct; connecting the detection duct between the curved duct and the straight duct, and preparing the detection duct such that the radial dimension of the inner wall surface of the detection duct gradually increases in the direction in which the straight duct faces the curved duct. One end of the curved duct is used as an air inlet, and one end of the straight duct is used as an air outlet.

[0046] By connecting a detection duct between a curved duct and a straight duct, when a test gas is introduced into one end of the curved duct, the test gas can pass through the curved duct, the detection duct, and the straight duct in sequence. Since the radial dimension of the inner wall surface of the detection duct gradually increases in the direction in which the straight duct faces the curved duct, the perturbation width of the gas in the detection duct becomes smaller, and it can be understood that the detection accuracy of the flow rate detection member can be further ensured.

[0047] As a result, the smoke duct measuring device obtained by the processing method of the smoke duct measuring device according to the embodiment of the present invention has a small perturbation width of the internal gas, so the measurement accuracy is high.

[0048] In some embodiments, the processing method of the smoke duct measuring device according to the embodiment of the present invention further includes the steps of providing a plurality of wind speed detectors arranged at intervals along the circumferential direction in the detection duct, introducing a detection gas, and using the wind speed detectors to detect the gas flow velocity value in the detection duct, and obtaining the maximum gas flow velocity value and the minimum gas flow velocity value in the detection duct based on the gas flow velocity value. Here, when the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is greater than a first set value, the included angle between the inner wall surface of the detection duct and the center line of the detection duct is increased so that the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is less than or equal to the first set value.

[0049] After connecting the curved duct, the detection duct, and the straight duct in sequence, by introducing a test gas into one end of the curved duct, it is ensured that this test gas is substantially the same as the gas flow velocity in the industrial duct, and it can be understood that the wind speed is detected using a wind speed detector to facilitate the confirmation of the wind speed situation in the detection duct. Here, the first set value is the theoretical gas flow velocity value at the same cross-section in the detection duct, and when the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is greater than the first set value, it explains that the gas flow velocity values at the same cross-section in the detection duct are very different.

[0050] In some embodiments, when the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is greater than the first set value, the detection duct is replaced to increase the angle between the inner wall surface of the detection duct and the center line of the detection duct.

[0051] When the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is greater than the first set value, the gas flow velocity values at the same cross-section in the detection duct are very different. It is understood that the angle between the inner wall surface of the detection duct and the center line of the detection duct may be increased so that the difference between the maximum gas flow velocity value and the minimum gas flow velocity value becomes smaller than the first set value.

[0052] In some embodiments, the processing method of the smoke duct measuring device according to the embodiment of the present invention further includes the step of attaching a flow rate detection member to the detection duct.

[0053] In other words, increasing the angle between the inner wall surface of the detection duct and the center line of the detection duct and reconfirming that the difference between the maximum gas flow velocity value and the minimum gas flow velocity value in the detection duct is smaller than the first set value explains that this smoke duct measuring device is suitable for use in industrial ducts. Finally, in order to ensure the measurement accuracy of the smoke duct measuring device manufactured by this processing method, a flow rate detection member is attached to the detection duct.

[0054] It should be noted that the smoke duct measuring device 1 according to the embodiment of the present invention is obtained by processing using this processing method.

[0055] In the description of the present invention, terms such as "center", "longitudinal direction", "lateral direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "upper part", "bottom part", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. indicate the orientation or positional relationship based on those shown in the accompanying drawings, and are only for the purpose of facilitating and simplifying the description of the present invention, and do not indicate or imply that the mentioned device or element must have a specific orientation and must be constructed and operated in a specific orientation. Therefore, it should not be understood as limiting the present invention.

[0056] Furthermore, the terms "first" and "second" are used only for the purpose of description, and should not be understood as indicating or suggesting relative importance or implicitly indicating the number of the shown technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, for example, two, three, etc., unless specifically limited otherwise.

[0057] In the present invention, unless specifically and explicitly defined and limited, terms such as "attachment", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one, may be a mechanical connection, an electrical connection, or capable of communicating with each other, may be a direct connection or an indirect connection through an intermediate medium, or may be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood in light of the specific situation.

[0058] In the present invention, unless otherwise explicitly specified or limited, the first feature that is "above" or "below" the second feature means that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Further, the first feature being "above", "upper", and "upper surface" of the second feature means that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "lower", and "lower surface" of the second feature means that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is lower than that of the second feature.

[0059] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in combination with this embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Further, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner. Further, if they do not conflict with each other, those skilled in the art can combine and combine the different embodiments or examples described in this specification, and the features of different embodiments or examples.

[0060] As described above, the embodiments have been shown and described. However, the above embodiments are illustrative and should not be understood as limiting the present invention. It should be understood that any changes, modifications, substitutions, and variations made by those skilled in the art to the above embodiments are all within the protection scope of the present invention.

Description of Reference Numerals

[0061] 1 Smoke duct measuring device 11 Curved duct 12 Detection duct 121 Mounting hole 122 Sealing member 1221 Annular base 1222 Cover 123 Flow detection member 1231 Mounting part 1232 Detection part 13 Straight duct

Claims

1. A method for manufacturing a smoke duct measuring device, comprising: The manufacturing method includes: preparing a smoke duct composed of a curved duct and a straight duct; connecting a detection duct between the curved duct and the straight duct, and preparing the detection duct such that a radial dimension of an inner wall surface of the detection duct gradually increases in a direction in which the straight duct faces the curved duct; using one end of the curved duct as an air inlet and using one end of the straight duct as an air outlet, characterized in that it is a method for manufacturing a smoke duct measuring device of a smoke duct measuring device.

2. The manufacturing method includes: providing a plurality of wind speed detectors arranged at intervals along a circumferential direction in the detection duct; further including introducing a detection gas and detecting a gas flow velocity value in the detection duct using the wind speed detectors; obtaining a maximum gas flow velocity value and a minimum gas flow velocity value in the detection duct based on the gas flow velocity value, and when a difference between the maximum gas flow velocity value and the minimum gas flow velocity value is greater than a first set value, increasing an included angle between the inner wall surface of the detection duct and a center line of the detection duct so that the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is equal to or less than the first set value, characterized in that it is the method for manufacturing a smoke duct measuring device according to Claim 1.

3. When the difference between the maximum gas flow velocity value and the minimum gas flow velocity value is greater than a first set value, replacing the detection duct so that an included angle between the inner wall surface of the detection duct and a center line of the detection duct increases, characterized in that it is the method for manufacturing a smoke duct measuring device according to Claim 2.

4. The method for manufacturing a smoke duct measuring device according to Claim 3, further comprising attaching a flow rate detection member to the detection duct.

5. A smoke duct measuring device, comprising: composed of a curved duct, a detection duct, and a straight duct connected in sequence, an included angle between an inner wall surface of the detection duct and a center line of the detection duct is greater than 0 degrees and less than or equal to 15 degrees, and the smoke duct measuring device further includes a flow rate detection member provided in the detection duct, characterized in that it is a smoke duct measuring device.

6. The smoke duct measuring device according to Claim 5, characterized in that a radial dimension of an inner wall surface of the detection duct gradually increases in a direction in which the straight duct faces the curved duct.

7. The detection duct further includes a plurality of mounting holes arranged at intervals along the circumferential direction of the detection duct. There are a plurality of the flow rate detection members, and the plurality of flow rate detection members correspond one-to-one to the plurality of mounting holes. The flow rate detection member includes a mounting portion fitted and mounted in the mounting hole and a detection portion located inside the detection duct. The smoke duct measuring device according to claim 5 or 6 is characterized in that.

8. The mounting portion of the flow rate detection member is fitted into the mounting hole to fix the flow rate detection member, and the detection portion is arranged in the detection duct. The smoke duct measuring device according to claim 7 is characterized in that.

9. The detection duct further includes a plurality of sealing members, and the plurality of sealing members correspond one-to-one to the plurality of mounting holes. The sealing member includes an annular base and a cover detachably connected to the annular base. The annular base is connected to the outer wall surface of the detection duct, and one annular base surrounds one mounting hole. At least a part of the mounting portion passes through the mounting hole, and the mounting portion is rotatably or movably fitted into the annular base. The smoke duct measuring device according to claim 7 is characterized in that.

10. The angle formed between the axis of the detection portion and the center line of the detection duct is greater than 0 degree and less than 15 degrees. The smoke duct measuring device according to claim 9 is characterized in that.

11. The flow rate detection member is a Pitot duct, the axis of the mounting portion extends in a direction perpendicular to the direction in which the axis of the detection portion extends, and the detection portion extends along the direction close to the elbow portion. The smoke duct measuring device according to claim 9 is characterized in that.

12. The number of the flow rate detection members is an even number, and the distance between the plurality of flow rate detection members is 300 mm or more and 400 mm or less. The smoke duct measuring device according to claim 5 is characterized in that.

13. The detection portion is provided with a measurement hole so that the gas in the detection duct enters the flow rate detection member through the detection hole. When the mounting portion is rotated, the detection portion of the flow rate detection member rotates simultaneously. The smoke duct measuring device according to claim 7 is characterized in that.

14. The smoke duct measuring device according to claim 7, characterized in that the angle formed between the axis of the detection unit and the center line of the detection duct is equal to 0.

15. The smoke duct measuring device according to claim 5, characterized in that the smoke duct measuring device is obtained by the processing method according to any one of claims 1 to 4.

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