Smoke dust gas flow measuring device

Abstract

The utility model discloses a smoke gas flow measuring device, which comprises a measuring unit, a high pressure tapping pipe and a low pressure tapping pipe, the measuring unit comprises a measuring pipe and a throttling element arranged in the measuring pipe, the throttling element is a spindle throttling element, the throttling element comprises a spindle head part, a spindle middle part and a spindle tail part, and the spindle head part, the spindle middle part and the spindle tail part are arranged on the measuring pipe. The measuring tube is provided with a high-pressure hole at the joint of the head part of the spindle body and the middle part of the spindle body, the measuring tube is provided with a low-pressure hole at the joint of the middle part of the spindle body, the high-pressure tapping tube is communicated with the high-pressure hole, and the low-pressure tapping tube is communicated with the low-pressure hole. According to the smoke and dust gas flow measuring device, the throttling element is arranged in the measuring pipe, when smoke and dust gas flows through the device, differential pressure is generated on the measuring pipe, and the flow in a pipeline is obtained through conversion according to a differential pressure flow formula. According to the utility model, the pressure tapping pipe can be effectively prevented from being blocked by dirt, the integral differential pressure signal is more stable, the signal-to-noise ratio is larger, and the accuracy and the stability of measurement are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas flow measurement, and in particular relates to a smoke gas flow measurement device. Background Art

[0002] Industrial production involves the measurement of numerous relatively dirty gases, such as blast furnace, converter, and coke oven gases from smelting processes, as well as their mixtures, and flue gas after desulfurization and denitrification. These gases are typically transported through large pipelines (DN400 and above), resulting in slow flow rates and uneven and unstable flow patterns, making it difficult for flow measurement devices to generate flow signals with a high signal-to-noise ratio. Furthermore, the gases are laden with impurities such as particulate matter, industrial oil mist, and water vapor, which can easily contaminate and clog flow measurement devices, further complicating accurate measurement. Large pipeline diameters also make flow meter maintenance and cleaning cumbersome, time-consuming, and labor-intensive.

[0003] In the prior art, the Chinese utility model patent application number 201220384358.5, entitled "Bidirectional Probe Flowmeter," provides a solution based on the principle of an averaging tube. It utilizes the flow separation and resulting pressure drop generated by the fluid flowing through a cylindrical measuring element to form a differential pressure signal with the total pressure in the pipeline. A general calculation formula is used to convert the differential pressure into flow. However, this flowmeter can only measure the flow at a single location in the pipeline. If the overall flow is to be measured, the entire testing process is very cumbersome. The Chinese utility model patent application number 201220146722.4, entitled "Self-cleaning Full-Section Flue Gas Flow Velocity Measuring Device," further provides a design solution for large-sized flue gas emission ducts. Round tubes with wedge-shaped openings are placed back to back, with one opening facing the airflow for high pressure and the other opening facing away from the airflow for low pressure, forming differential pressure measurement units. Then the measurement units are connected together through pipes. The measurement units are evenly and symmetrically distributed, similar to a matrix structure. However, due to the large size and low flow rate of the flue gas exhaust pipe, the detection stability of this structure is poor.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0005] The purpose of the utility model is to provide a smoke gas flow measurement device, which can solve the technical problems of the existing smoke gas flow measurement device, such as weak flow signal, easy clogging and complicated operation.

[0006] In order to achieve the above-mentioned purpose, a specific embodiment of the present invention provides a smoke gas flow measuring device, including a measuring unit, a high-pressure pressure taking tube and a low-pressure pressure taking tube, the measuring unit including a measuring tube and a throttling device arranged inside the measuring tube, the throttling device is a spindle throttling device, the throttling device includes a spindle head, a spindle middle part and a spindle tail, the measuring tube is provided with a high-pressure hole at the connection between the spindle head and the spindle middle part, the measuring tube is provided with a low-pressure hole at the connection between the spindle middle part, the high-pressure pressure taking tube is connected to the high-pressure hole, and the low-pressure pressure taking tube is connected to the low-pressure hole.

[0007] In one or more embodiments of the present invention, the spindle head is elliptical or parabolic, the middle part of the spindle is cylindrical, the axis of the throttling element coincides with the axis of the measuring tube, and the throttling element is fixedly installed inside the measuring tube through a mounting plate.

[0008] In one or more embodiments of the present invention, the high-pressure pressure taking pipe is connected to the high-pressure hole through a high-pressure branch pipe, and the low-pressure pressure taking pipe is connected to the low-pressure hole through a low-pressure branch pipe.

[0009] In one or more embodiments of the present invention, the measuring units are provided in multiple groups, each group of measuring units is connected to the high-pressure pressure pipe through a high-pressure branch pipe, and each group of measuring units is connected to the low-pressure pressure pipe through a low-pressure branch pipe.

[0010] In one or more embodiments of the present invention, first flow stabilizers for reducing flow field interference are installed on the outer sides of the high-pressure branch pipe and the low-pressure branch pipe.

[0011] In one or more embodiments of the present invention, the angle between the high-pressure branch pipe and the high-pressure pressure pipe is the same as the angle between the low-pressure branch pipe and the low-pressure pressure pipe, and the angle ranges from 0° to 180°.

[0012] In one or more embodiments of the present invention, a high-pressure extension pipe is provided between the high-pressure branch pipe and the high-pressure hole, and a low-pressure extension pipe is provided between the low-pressure branch pipe and the low-pressure hole.

[0013] In one or more embodiments of the present invention, the angle between the high-pressure branch pipe and the high-pressure extension pipe is the same as the angle between the low-pressure branch pipe and the low-pressure extension pipe, and the angle ranges from 0° to 180°.

[0014] In one or more embodiments of the present invention, at least one group of high-pressure pressure taking tubes and low-pressure pressure taking tubes are provided, and adjacent high-pressure pressure taking tubes and low-pressure pressure taking tubes are fixedly connected by connecting rods. A second flow stabilizer is also installed on the outside of the adjacent high-pressure pressure taking tubes and low-pressure pressure taking tubes to reduce flow field interference.

[0015] Compared with the prior art, the smoke gas flow measurement device in the present invention is a measurement device based on the differential pressure principle and composed of several small measurement units installed inside the pipeline. Each measurement unit is a circular tube with a built-in spindle throttling device. When the smoke gas flows through the device, a differential pressure is generated, and the flow rate in the pipeline is converted according to the differential pressure flow formula. The self-cleaning spindle measurement unit design can effectively prevent dirt from clogging the pressure taking tube. The spindle throttling devices in each measurement unit have excellent rectification capabilities, and the airflows that interfere with each other will not affect the stability of the differential pressure signal. As a result, the overall differential pressure signal of the measuring device is more stable, the signal-to-noise ratio is greater, and the accuracy and stability of the measurement are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some of the embodiments described in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts.

[0017] Figure 1 This is a schematic structural diagram of a smoke gas flow measurement device in a specific embodiment of the present invention;

[0018] Figure 2 This is a structural diagram of a measuring unit in a specific embodiment of the present utility model;

[0019] Figure 3 This is a schematic structural diagram of a smoke gas flow measurement device in Example 1 of the present utility model;

[0020] Figure 4 This is a schematic structural diagram of a smoke gas flow measurement device in Example 2 of the present utility model;

[0021] Figure 5 This is a structural diagram of the smoke gas flow measurement device in Example 3 of the present utility model.

[0022] Explanation of the main figure marks: 1. Measuring unit, 11. Measuring tube, 111. Air inlet, 112. Air outlet, 113. High-pressure hole, 114. Low-pressure hole, 12. Throttle, 121. Spindle head, 122. Spindle middle, 123. Spindle tail, 13. Mounting plate, 2. High-pressure branch pipe, 3. Low-pressure branch pipe, 4. High-pressure pressure taking pipe, 5. Low-pressure pressure taking pipe, 6. Connecting rod, 7. First flow stabilizer, 8. High-pressure extension pipe, 9. Low-pressure extension pipe, 10. Second flow stabilizer. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "vertical", "horizontal", "top", "bottom", "up", "down", "front", "back", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] like Figures 1 and 2 As shown, a smoke gas flow measuring device in a specific embodiment of the present invention includes a measuring unit 1, a high-pressure pressure taking tube 4 and a low-pressure pressure taking tube 5. The measuring unit 1 includes a measuring tube 11 and a throttle member 12 arranged inside the measuring tube 11. The throttle member 12 is a spindle throttle member. The throttle member 12 includes a spindle head 121, a spindle middle part 122 and a spindle tail 123. The measuring tube 11 is provided with a high-pressure hole 113 at the connection between the spindle head 121 and the spindle middle part 122. The measuring tube 11 is provided with a low-pressure hole 114 at the connection between the spindle middle part 122. The high-pressure pressure taking tube 4 is connected to the high-pressure hole 113, and the low-pressure pressure taking tube 5 is connected to the low-pressure hole 114.

[0026] When the smoke gas flows through the device, the measuring unit 1 generates air pressure at the high-pressure hole 113 and the low-pressure hole 114. The high and low pressures at the corresponding positions are sensed by the sensor through the high-pressure pressure pipe 4 and the low-pressure pressure pipe 5, and the pressure difference at the high-pressure hole 113 and the low-pressure hole 114 is calculated. The gas flow rate q v The pressure difference is satisfied:

[0027] ,in q v is the smoke gas flow rate, A is the expansion coefficient, α is the flow coefficient, ρ is the gas density, Δp is the air pressure difference.

[0028] In this embodiment, the spindle head 121 is elliptical or parabolic, the spindle middle portion 122 is cylindrical, the axis of the throttle element 12 coincides with the axis of the measuring tube 11, and the throttle element 12 is fixedly mounted inside the measuring tube 11 via a mounting plate 13. The high-pressure tapping pipe 4 is connected to the high-pressure port 113 via a high-pressure branch pipe 2, and the low-pressure tapping pipe 5 is connected to the low-pressure port 114 via a low-pressure branch pipe 3.

[0029] Example 1

[0030] like Figures 3 and 4 As shown, in this embodiment, four groups of measuring units 1 are provided. Each group of measuring units 1 is connected to a high-pressure pressure pipe 4 via a high-pressure branch pipe 2, and each group of measuring units 1 is connected to a low-pressure pressure pipe 5 via a low-pressure branch pipe 3. A first flow stabilizer 7 is installed on the outside of the high-pressure branch pipe 2 and the low-pressure branch pipe 3 to reduce flow field interference. The angle A between the high-pressure branch pipe 2 and the high-pressure pressure pipe 4 is the same as the angle A between the low-pressure branch pipe 3 and the low-pressure pressure pipe 5, and the angle range of angle A is 0° to 180°. In this embodiment, angle A is an obtuse angle and can be adjusted according to actual measurement needs.

[0031] The high-pressure and low-pressure pipes 4 and 5 are each provided with at least one group. The adjacent high-pressure and low-pressure pipes 4 and 5 are fixedly connected by connecting rods 6. The outer sides of the adjacent high-pressure and low-pressure pipes 4 and 5 are also installed with second flow stabilizers 10 for reducing the interference of the flow field. In this embodiment, the high-pressure and low-pressure pipes 4 and 5 are each provided with one group. According to the measurement requirements, the high-pressure and low-pressure pipes 4 and 5 can be connected in series to form multiple groups. The pressure difference Δp The more samples you take, the more pressure difference you can measure. Δp The closer it is to the true pressure difference.

[0032] Example 2

[0033] Compared with Example 1, the angle A between the high-pressure branch pipe 2 and the high-pressure pressure taking pipe 4 in this embodiment is the same as the angle A between the low-pressure branch pipe 3 and the low-pressure pressure taking pipe 5, and the angle A is a right angle. The smoke gas flow measurement device with this structure can be applied to pipelines.

[0034] Example 3

[0035] Compared to Example 1, this embodiment further includes a high-pressure extension tube 8 between the high-pressure branch pipe 2 and the high-pressure port 113, and a low-pressure extension tube 9 between the low-pressure branch pipe 3 and the low-pressure port 114. The angle between the high-pressure branch pipe 2 and the high-pressure extension tube 8 is the same as the angle between the low-pressure branch pipe 3 and the low-pressure extension tube 9, and the angle ranges from 0° to 180°. The position of the measurement unit 1 within the measurement pipeline can be adjusted as needed by adjusting the lengths of the branch pipes and extension pipes.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0037] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A smoke gas flow measurement device, characterized in that: The invention comprises a measuring unit (1), a high-pressure pressure-taking tube (4) and a low-pressure pressure-taking tube (5), wherein the measuring unit (1) comprises a measuring tube (11) and a throttle member (12) arranged inside the measuring tube (11), wherein the throttle member (12) is a spindle throttle member, wherein the throttle member (12) comprises a spindle head (121), a spindle middle part (122) and a spindle tail part (123), wherein the measuring tube (11) is provided with a high-pressure hole (113) at the connection between the spindle head (121) and the spindle middle part (122), wherein the measuring tube (11) is provided with a low-pressure hole (114) at the connection between the spindle middle part (122), wherein the high-pressure pressure-taking tube (4) is in communication with the high-pressure hole (113), and wherein the low-pressure pressure-taking tube (5) is in communication with the low-pressure hole (114).

2. The smoke gas flow measurement device according to claim 1, characterized in that: The spindle head (121) is elliptical or parabolic, the spindle middle (122) is cylindrical, the axis of the throttling element (12) coincides with the axis of the measuring tube (11), and the throttling element (12) is fixedly mounted inside the measuring tube (11) via a mounting plate (13).

3. The smoke gas flow measurement device according to claim 1, characterized in that: The high-pressure pressure-taking pipe (4) is connected to the high-pressure hole (113) via a high-pressure branch pipe (2), and the low-pressure pressure-taking pipe (5) is connected to the low-pressure hole (114) via a low-pressure branch pipe (3).

4. The smoke gas flow measurement device according to claim 3, characterized in that: The measuring units (1) are provided in multiple groups, each group of measuring units (1) is connected to the high-pressure pressure pipe (4) via the high-pressure branch pipe (2), and each group of measuring units (1) is connected to the low-pressure pressure pipe (5) via the low-pressure branch pipe (3).

5. The smoke gas flow measurement device according to claim 3, characterized in that: A first flow stabilizing plate (7) for reducing flow field interference is installed on the outside of the high-pressure branch pipe (2) and the low-pressure branch pipe (3).

6. The smoke gas flow measurement device according to claim 3, characterized in that: The included angle between the high-pressure branch pipe (2) and the high-pressure pressure pipe (4) is the same as the included angle between the low-pressure branch pipe (3) and the low-pressure pressure pipe (5), and the range of the included angle is 0° to 180°.

7. The smoke gas flow measurement device according to claim 3, characterized in that: A high-pressure extension pipe (8) is provided between the high-pressure branch pipe (2) and the high-pressure hole (113), and a low-pressure extension pipe (9) is provided between the low-pressure branch pipe (3) and the low-pressure hole (114).

8. The smoke gas flow measurement device according to claim 7, characterized in that: The included angle between the high-pressure branch pipe (2) and the high-pressure extension pipe (8) is the same as the included angle between the low-pressure branch pipe (3) and the low-pressure extension pipe (9), and the range of the included angle is 0° to 180°.

9. The smoke gas flow measurement device according to claim 1, characterized in that: At least one group of the high-pressure pressure-taking tubes (4) and the low-pressure pressure-taking tubes (5) are provided, and adjacent high-pressure pressure-taking tubes (4) and low-pressure pressure-taking tubes (5) are fixedly connected via connecting rods (6). Second flow stabilizing plates (10) for reducing flow field interference are also installed on the outer sides of the adjacent high-pressure pressure-taking tubes (4) and low-pressure pressure-taking tubes (5).

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