Large-caliber gas flow measuring device

Abstract

The utility model relates to a large-diameter gas flow measuring device which comprises an inlet collecting pipe, an outlet collecting pipe, a small-diameter pipeline and a flowmeter. The small-diameter pipeline is connected between the inlet collecting pipe and the outlet collecting pipe. The number of the small-caliber pipelines is more than two, and the specifications of the small-caliber pipelines are consistent; the flowmeter is connected with the small-caliber pipeline and used for measuring the medium flow in the small-caliber pipeline. The device has the advantages of being simple in structure, low in requirement for measuring equipment and installation environment, capable of being secondarily designed according to site conditions and high in applicability. The large-diameter pipeline is divided into a plurality of equivalent small-diameter pipelines, flow values are obtained by measuring medium flow in the small-diameter pipelines through the flow meter, then gas flow of the large-diameter pipeline is obtained through calculation, measurement of the flow of the large-diameter pipeline is achieved, stability is high, and measurement precision is high.

Description

Technical Field

[0001] The utility model belongs to the field of pipeline flow measurement, in particular to a large-caliber gas flow measurement device. Background Art

[0002] In various fields, it is often necessary to measure the flow rate of large-diameter pipelines that transport fluids. The main difficulty currently exists is: when using conventional flow meters (such as flow orifice plates, bar flow meters, etc.) for direct measurement, a certain length of straight pipe section should be guaranteed before and after the installation position of the flow meter to ensure the stability of the internal flow field of the internal pipeline, thereby obtaining higher measurement accuracy. The length of the straight pipe section required by the flow meter is related to the diameter of the pipeline. The larger the diameter of the pipeline, the longer the straight pipe section should be. The resulting problem is: in some sites with limited space, it is difficult to set up a straight pipe section that meets the measurement requirements; for straight pipe sections that can be set up, it is not economical to set up a longer straight pipe section just to meet the measurement requirements.

[0003] In the lime rotary kiln industry, cooling air used in production is a critical factor in ensuring lime cooling and kiln operating conditions. As kiln specifications increase, the diameter of the cooling air duct reaches 1.5 meters. Flow meter measurement requires a straight pipe section exceeding 10 meters, making it difficult and uneconomical to arrange using conventional means. In fact, currently used field measurement devices are unable to accurately measure flow, which greatly complicates kiln production control and hinders the realization of intelligent control goals in lime plants.

[0004] Prior art, application number 201810060829.9, discloses a flowmeter suitable for measuring flow in large-diameter pipelines. By installing a guide plate, a rectifier plate, and a rectifier structure, this reduces flow field variations within large-diameter pipelines, thereby improving flow measurement accuracy. Furthermore, the shape of the flow sensor probe is redesigned to further enhance measurement accuracy. However, this flowmeter is overly complex, resulting in high production costs and a poor fit for on-site modification. Summary of the Invention

[0005] The purpose of the utility model is to provide a large-caliber gas flow measurement device to solve the problems existing in the current large-size pipeline flow measurement and reduce the transformation cost.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A large-diameter gas flow measurement device includes an inlet manifold, an outlet manifold, a small-diameter pipeline, and a flowmeter. The small-diameter pipeline is connected between the inlet manifold and the outlet manifold. There are two or more small-diameter pipelines, and the specifications of the small-diameter pipelines are consistent. The flowmeter is connected to the small-diameter pipeline and is used to measure the flow of the medium in the small-diameter pipeline.

[0008] The inlet collection pipe includes a body and a partition. The body is a reducer with circular ends. One end of the circular reducer is an open structure and is placed in a homogeneous environment. The other end is closed and fixedly connected to the partition. Several mounting holes are provided on the partition, and the partition is fixedly connected to the small-diameter pipe through the mounting holes.

[0009] The circular reducing tube is in the shape of a truncated cone.

[0010] The outlet collection pipe includes a body and a partition. The body is a reducing pipe with circular ends. One end of the circular reducing pipe is closed and fixedly connected to the partition. The partition is provided with a plurality of mounting holes. The partition is fixedly connected to the small-diameter pipe through the mounting holes. The other end of the circular reducing pipe is connected to an external pipe or equipment.

[0011] The small-diameter pipe is a straight circular pipe structure.

[0012] The small-diameter pipes are evenly arranged between the inlet collecting pipe and the outlet collecting pipe.

[0013] The small-diameter pipeline is provided with an opening for installing a flow meter.

[0014] The flow meter is a bar flow meter.

[0015] There are one or more flow meters.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The large-diameter gas flow measurement device divides the large-diameter pipeline into several equivalent small-diameter pipelines. The flow meter measures the medium flow in the small-diameter pipeline to obtain the flow value, and then calculates the gas flow in the large-diameter pipeline, thereby realizing the measurement of the large-diameter pipeline flow with high stability and high measurement accuracy.

[0018] 2. The large-caliber gas flow measurement device has a simple structure and low requirements for measuring equipment and installation environment. It can be redesigned according to on-site conditions and has strong applicability.

[0019] 3. Large-caliber gas flow measurement devices can effectively solve the problem of limited installation space and difficult layout of flow meters. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model.

[0021] Figure 2 yes Figure 1 Section along line AA Figure 1 .

[0022] Figure 3 yes Figure 1 Section along line AA Figure 2 .

[0023] Figure 4 yes Figure 1 Section along line AA Figure 3 .

[0024] In the figure: 1-inlet collecting pipe 2-small diameter pipe 3-outlet collecting pipe 4-flow meter 5-partition. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0026] See Figure 1 A large-diameter gas flow measurement device includes an inlet manifold 1, an outlet manifold 3, a small-diameter pipe 2, and a flow meter 4. The small-diameter pipe is connected between the inlet manifold 1 and the outlet manifold 3, and the inlet manifold 1 and the outlet manifold 3 are coaxially arranged; there are more than two small-diameter pipes 2, and the specifications of the small-diameter pipes 2 are consistent; the flow meter 4 is connected to the small-diameter pipe 2 and is used to measure the medium flow (gas flow) in the small-diameter pipe 2. There are one or more (m) flow meters 4. The small-diameter pipe 2 is provided with an opening for installing the flow meter 4, and the position of the opening meets the layout requirements for the flow measurement of the small-diameter pipe 2. The flow meter 4 is a bar-type flow meter. The bar-type flow meter has the least impact on the flow field and can ensure to the greatest extent that the measured pipeline flow is consistent with the flow of other small-diameter pipes 2.

[0027] The inlet manifold 1 comprises a body and a baffle 5. The body is a reducing pipe with rounded ends and a length of L1. One end of the circular reducing pipe is open with a radius of R1 and is placed in a homogeneous environment, such as atmospheric air. The other end has a radius of R2 and is sealed and fixedly connected to the baffle 5. The baffle 5 is provided with several mounting holes, through which the baffle 5 and the small-diameter pipe 2 are fixedly connected. The circular reducing pipe is truncated cone-shaped.

[0028] The structure of the outlet manifold 3 is basically the same as that of the inlet manifold 1, with the only difference being that the circular reducer has a length of L3, a radius of R2 at one end, is welded and fixed to the small-diameter pipe 2 through a partition 5, and the other end has a radius of R3 connected to an external pipe or equipment.

[0029] The small-diameter pipes 2 are evenly arranged between the inlet manifold 1 and the outlet manifold 3. The number of small-diameter pipes 2 can be 2, 3, or 5. The distribution method is shown in Figure 2-Figure 4 , the spacing between adjacent small-diameter pipes 2 is the same. The small-diameter pipes 2 are straight circular pipes. The radius r and number n can be calculated based on the layout length L2, that is, L2 is greater than N times the diameter of the small-diameter pipe 2. When measuring flow with a bar-type flowmeter, different measurement accuracies require different straight pipe lengths. Generally, a distance of three pipe diameters is required before and after the bar-type flowmeter, that is, N is greater than 6.

[0030] Method for measuring flow in large-diameter pipelines using a large-diameter gas flow measuring device:

[0031] The measurement principle involves dividing a large-diameter pipe into several equivalent small-diameter pipes 2. The flow rate in each small-diameter pipe 2 is measured and summed to obtain the flow rate in the large-diameter pipe. The small-diameter pipes 2 are evenly arranged to maintain a consistent flow rate. One or more Barometer flowmeters 4 are used to measure the flow rate q of n small-diameter pipes 2, and the flow rate Q in the large-diameter pipe is calculated.

[0032] Given that the flow rate of the pipeline to be measured is Q, the length of the available installation positions is L (L = L1 + L2 + L3), where the installation length of the small-diameter pipeline 2 is L2, calculate the radius r of the small-diameter pipeline using the formula: r = L2 / 2N; assuming that the flow rate of the medium in the pipeline is v, calculate the number n of the small-diameter pipelines 2 using the formula: n = Q / (πr 2 ×v). Based on the radius r and flow rate Q / n of the small-diameter pipe 2, an appropriate barometer can be selected. During production, the flow rate q of the small-diameter pipe 2 is measured using a barometer 4, and the flow rate of the large-diameter pipe is calculated as Q = nq.

[0033] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A large-caliber gas flow measurement device, characterized in that: It includes an inlet collecting pipe, an outlet collecting pipe, a small-diameter pipe, and a flow meter. The small-diameter pipe is connected between the inlet collecting pipe and the outlet collecting pipe. There are more than two small-diameter pipes, and the specifications of the small-diameter pipes are consistent. The flow meter is connected to the small-diameter pipe and is used to measure the medium flow in the small-diameter pipe.

2. A large-caliber gas flow measurement device according to claim 1, characterized in that: The inlet collection pipe includes a body and a partition. The body is a reducer with circular ends. One end of the circular reducer is an open structure and is placed in a homogeneous environment. The other end is closed and fixedly connected to the partition. Several mounting holes are provided on the partition, and the partition is fixedly connected to the small-diameter pipe through the mounting holes.

3. A large-caliber gas flow measurement device according to claim 2, characterized in that: The circular reducing tube is in the shape of a truncated cone.

4. A large-caliber gas flow measurement device according to claim 1, characterized in that: The outlet collection pipe includes a body and a partition. The body is a reducing pipe with circular ends. One end of the circular reducing pipe is closed and fixedly connected to the partition. The partition is provided with a plurality of mounting holes. The partition is fixedly connected to the small-diameter pipe through the mounting holes. The other end of the circular reducing pipe is connected to an external pipe or equipment.

5. A large-caliber gas flow measurement device according to claim 1, characterized in that: The small-diameter pipe is a straight circular pipe structure.

6. A large-caliber gas flow measurement device according to claim 1, characterized in that: The small-diameter pipes are evenly arranged between the inlet collecting pipe and the outlet collecting pipe.

7. A large-caliber gas flow measurement device according to claim 1, characterized in that: The small-diameter pipeline is provided with an opening for installing a flow meter.

8. The large-caliber gas flow measurement device according to claim 1, characterized in that: The flow meter is a bar type flow meter.

9. A large-caliber gas flow measurement device according to claim 1, characterized in that: There are one or more flow meters.

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