A method and device for synchronous detection of flow and material

Abstract

The present invention belongs to the field of flow measurement technology, and discloses a method and device for synchronous detection of flow and substance. A pipeline system is connected to a flow measurement working condition pipeline, and the pipeline diameter of the pipeline system is the same as the diameter of the flow measurement working condition pipeline; the sensing system includes a thermal flow sensor and a force flow sensor; the thermal flow sensor and the force flow sensor are respectively connected to the pipeline system to collect data; the electrical system is connected to the sensing system; it provides energy to the sensing system, and at the same time receives the signal sent by the sensing system, analyzes and calculates the flow and substance in the flow measurement working condition pipeline. Through the method and device for synchronous detection of flow and substance proposed by the present invention, it is possible to identify abnormal conditions of fluid substances in the pipeline and realize synchronous detection of flow and substance.

Description

Technical Field

[0001] The present invention relates to the technical field of flow measurement, and in particular to a method and device for synchronous detection of flow and material. Background Art

[0002] Whether the flow rate and material state of fluids in each link of the industrial production process meet the preset requirements of the production process is an important factor affecting production safety and quality. However, due to the lack of effective fluid material detection methods, the flow rate of fluids can only be measured when the fluid is assumed to be the preset fluid material. As a result, when the fluid material changes, not only is it impossible to effectively identify and take safety measures in a timely manner, but the flow measurement results will also have huge deviations due to the difference between the preset medium and the actual medium of the flow sensing equipment, which has a serious impact on production safety and production quality. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and device for synchronous detection of flow and material, which monitors the fluid material condition while realizing flow sensing. When an abnormality of the fluid material is detected, the fluid material is analyzed and detected, and the flow measurement parameters are corrected according to the detection results.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for synchronously detecting flow and material, comprising the following steps:

[0006] 1) Working preprocessing: The flow measurement pipeline is connected to the pipeline system 1, so that the fluid in the flow measurement pipeline flows through the pipeline system 1 and passes through the sensing system 2; the electrical system 3 provides energy to the sensing system 2 to keep the sensing system 2 working normally; the fluid medium n0 is preset in the sensing system 2;

[0007] 2) Medium status judgment: The electrical system 3 receives the thermal flow sensor output from the sensor system 2 and displays the flow rate Q t With force flow sensor display flow Q f , and compare the consistency of the actual flow values ​​calculated by formula 1) and formula 2);

[0008] Q=H(n,Q t ) 1)

[0009] Q=ρ(n,Q f ) 2)

[0010] Where n represents the fluid substance. When the fluid medium is a pure substance, n represents the substance type. When the fluid is a mixture of multiple specific substances, n represents the proportion of each substance. Q is the actual flow rate. H is the ratio of Q and Q. t and n; ρ is the relationship function between Q and Q f and n relation functions.

[0011] When the actual flow values ​​calculated by formula 1) and formula 2) are consistent, it means that the preset fluid medium is consistent with the measured fluid medium, n=n0, and no fluid medium analysis is performed; when the actual flow values ​​calculated by formula 1) and formula 2) are inconsistent, it means that the preset fluid medium is inconsistent with the measured fluid medium, and the electrical system 3 prompts that the preset fluid medium does not match the actual medium of the pipeline;

[0012] 3) Flow and material analysis: When the preset fluid medium is consistent with the measured fluid medium, the electrical system 3 analyzes the flow value obtained by formula 1) and formula 2) as the actual flow rate; when the preset fluid medium is inconsistent with the measured fluid medium, the fluid medium and actual flow rate are obtained according to formula 1) and formula 2).

[0013] Furthermore, when the preset fluid medium is inconsistent with the measured fluid medium, the fluid medium and the actual flow rate are solved analytically: t With Q f It is a known quantity. Using the simultaneous equations of Formula 1) and Formula 2), the fluid medium n and the actual flow rate Q can be directly solved.

[0014] Furthermore, when the preset fluid medium is inconsistent with the measured fluid medium, the fluid medium and the actual flow rate are solved numerically: the difference between the actual flow rate Q is calculated according to formula 1) and formula 2), and the fluid medium n is repeatedly recursively adjusted until there is no difference between the actual flow rate Q calculated by formula 1) and formula 2). The specific execution process is as follows:

[0015] A. Calculate the actual flow value Q1 according to formula 1), and calculate the actual flow value Q2 according to formula 2);

[0016] B. Calculate ΔQ = Q1 - Q2;

[0017] C. If ΔQ≠0, then Q a =(Q1+Q2) / 2 is used as the recursive actual flow value and is substituted into Formula 2) to calculate the recursive fluid medium n a , and n a Set as the preset fluid medium;

[0018] D. Repeat A to C until ΔQ = 0. At this time, the preset fluid medium is the actual fluid medium, and the flow value obtained by the electrical system 3 according to formula 1) and formula 2) is the actual flow rate.

[0019] A flow and material synchronous detection device includes a pipeline system 1, a sensor system 2 and an electrical system 3;

[0020] The pipeline system 1 is connected to the flow measurement working condition pipeline, and the pipeline diameter of the pipeline system 1 is the same as the flow measurement working condition pipeline diameter;

[0021] The sensing system 2 includes a thermal flow sensor 21 and a force flow sensor 22; the thermal flow sensor 21 and the force flow sensor 22 are respectively connected to the pipeline system 1, and the thermal flow sensor 21 and the force flow sensor 22 are in the same cross section to collect data and ensure that the fluid in the pipeline system 1 does not leak out;

[0022] The electrical system 3 is connected to the sensing system 2, provides energy to the sensing system 2, receives the signal from the sensing system 2, and performs analysis and calculation to obtain the flow rate and substance in the flow measurement pipeline.

[0023] Furthermore, the thermal flow sensor 21 is of a constant power type, where the heating power of the thermal flow sensor 21 is constant; or of a constant temperature type, where the operating temperature of the thermal flow sensor 21 is kept constant.

[0024] Furthermore, the force flow sensor 22 is a differential pressure flow sensor or a target flow sensor.

[0025] The beneficial effects of the present invention are as follows: the method and device for synchronous detection of flow and substance proposed in the present invention can realize the identification of abnormal conditions of fluid substances in a pipeline and realize synchronous detection of flow and substance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the flow and substance synchronous detection device provided by the present invention;

[0027] Figure 2 A schematic diagram of the average flow velocity measurement error of the pipeline of the flow and material synchronous detection device provided by the present invention;

[0028] Figure 3 A schematic diagram of the helium concentration measurement error in the pipeline of the flow and substance synchronization detection device provided by the present invention;

[0029] In the figure: 1 piping system; 2 sensing system; 3 electrical system; 21 thermal flow sensor; 22 force flow sensor. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figure 1 As shown, a flow and material synchronous detection device includes a pipeline system 1, a sensor system 2, and an electrical system 3.

[0032] The pipeline system 1 has an interface for installing a fixed sensing system and ensures the sealing of the sensing system 2 after installation (that is, the fluid in the pipeline cannot leak out); in addition, the pipeline diameter of the pipeline system 1 is the same as the diameter of the flow measurement working condition pipeline; at the same time, the pipeline system 1 has an interface for connecting to the flow measurement working condition pipeline and ensures the sealing of the connection.

[0033] The sensing system 2 includes a thermal flow sensor 21 and a force flow sensor 22; wherein, the working mode of the thermal flow sensor 21 can be either a constant power mode, that is, the sensor heating power is constant, or a constant temperature mode, that is, the sensor working temperature remains constant; the force flow sensor 22 includes but is not limited to a differential pressure flow sensor and a target flow sensor.

[0034] The electrical system 3 provides energy for the sensing system 2 to operate, receives signals from the sensing system 2, and performs analysis and calculation to obtain the flow rate and substance in the measured pipeline.

[0035] The principle of the flow and material synchronous detection device is: the working principle of the thermal flow sensor 21 in the sensing system 2 is to realize flow sensing by utilizing the relationship between the convective heat transfer intensity between the fluid and the sensor and the flow rate. Since the convective heat transfer characteristics between the fluid and the sensor are related to the fluid medium, when the fluid medium changes, the thermal flow sensor displays the flow rate Q t The relationship between it and the actual flow rate Q can be expressed as formula 1).

[0036] Q=H(n,Q t )1)

[0037] The working principle of the force flow sensor in the sensing system is to realize flow sensing by using the relationship between the force exerted on the sensor by the flow of the fluid and the flow rate. The force exerted on the sensor by the flow of the fluid is related to the density of the fluid. When the fluid medium changes, the force flow sensor displays the flow rate Q. f The relationship between it and the actual flow Q can be expressed as formula 2).

[0038] Q=ρ(n,Q f )2)

[0039] According to formula 1) and formula 2), the actual fluid medium n and actual flow rate Q in the pipeline can be solved.

[0040] The working process of the flow and material synchronous detection device is:

[0041] 1) Working preprocessing: The flow measurement pipeline is connected to the pipeline system 1, so that the fluid in the measured pipeline flows through the pipeline system 1 and passes through the sensing system 2; the electrical system 3 provides energy to the sensing system 2 to keep the sensing system 2 working normally; the fluid medium n0 is preset in the sensing system 2.

[0042] 2) Medium status judgment: Electrical system 3 receives Q output by sensor system 2 t With Q f , and compare the consistency of the actual flow values ​​calculated by formula 1) and formula 2); when the actual flow values ​​calculated by formula 1) and formula 2) are consistent, it means that the preset fluid medium is consistent with the measured fluid medium, that is, n=n0, and no fluid medium analysis is required; when the actual flow values ​​calculated by formula 1) and formula 2) are inconsistent, it means that the preset fluid medium is inconsistent with the measured fluid medium, and the electrical system 3 prompts a warning message that the preset fluid medium is inconsistent with the actual medium of the pipeline.

[0043] 3) Flow and material analysis: If the preset fluid medium is consistent with the measured fluid medium, the electrical system 3 analyzes the flow value according to formula 1) and formula 2) to obtain the actual flow rate; if the fluid medium is inconsistent with the measured fluid medium, the fluid material and actual flow rate are analyzed according to formula 1) and formula 2).

[0044] The flow and substance synchronous detection device uses formula 1) and formula 2) to analyze the fluid medium and the actual flow rate, including but not limited to the following two methods:

[0045] 1) Analytical solution: Since Q t With Q f It is a known quantity. Using the simultaneous equations of Formula 1) and Formula 2), the fluid medium n and the actual flow rate Q can be directly solved.

[0046] 2) Numerical solution: Calculate the difference between Q using Formula 1) and Formula 2), and repeatedly recursively adjust the fluid medium n until there is no difference between Q calculated using Formula 1) and Formula 2). The specific implementation process is as follows:

[0047] A. Calculate the actual flow value Q1 according to formula 1), and calculate the actual flow value Q2 according to formula 2);

[0048] B. Calculate ΔQ = Q1 - Q2;

[0049] C. If ΔQ≠0, then Q a =(Q1+Q2) / 2 is used as the recursive actual flow value and is substituted into Formula 2) to calculate the recursive fluid medium n a , and n a Set as the preset fluid medium;

[0050] D. Repeat A to C until ΔQ = 0. At this time, the preset fluid medium is the actual fluid medium, and the flow value obtained by the electrical system according to formula 1) and formula 2) is the actual flow rate.

[0051] In order to verify the rationality of the scheme, a flow and substance synchronous detection device for the test was prepared. The diameter of the pipeline system 1 is 20 cm. In the sensing system 2, a constant temperature thermal flow sensor 21 is used, and a differential pressure flow sensor is used as a force flow sensor 22. The flow and substance synchronous detection device was used to measure the flow rate and concentration of the helium and air mixture. The average flow rate measurement error is as follows: Figure 2 As shown, the maximum error does not exceed 0.2m / s, and the concentration measurement results are as follows Figure 3 As shown, the maximum error does not exceed 2%.

Claims

1. A method for synchronous detection of flow and substance, characterized in that: The steps are as follows: 1) Working pre-processing: the flow measurement pipeline is connected to the pipeline system (1), so that the fluid in the flow measurement pipeline flows through the pipeline system (1) and passes through the sensing system (2); the electrical system (3) provides energy to the sensing system (2), so that the sensing system (2) maintains normal operation; the fluid medium n0 is preset in the sensing system (2); 2) Medium status judgment: The electrical system (3) receives the output of the sensing system (2) and the thermal flow sensor displays the flow rate Q t With force flow sensor display flow Q f , and compare the consistency of the actual flow values ​​calculated by formula 1) and formula 2); Q=H(n,Q t )1) Q=ρ(n,Q f )2) Where n represents the fluid substance. When the fluid medium is a pure substance, n represents the substance type. When the fluid is a mixture of multiple specific substances, n represents the proportion of each substance. Q is the actual flow rate. H is the ratio of Q and Q. t and n; ρ is the relationship function between Q and Q f and n relationship functions; When the actual flow values ​​calculated by formula 1) and formula 2) are consistent, it means that the preset fluid medium is consistent with the measured fluid medium, n=n0, and no fluid medium analysis is performed; when the actual flow values ​​calculated by formula 1) and formula 2) are inconsistent, it means that the preset fluid medium is inconsistent with the measured fluid medium, and the electrical system (3) prompts that the preset fluid medium is inconsistent with the actual medium of the pipeline; 3) Flow and material analysis: When the preset fluid medium is consistent with the measured fluid medium, the electrical system (3) analyzes the flow value obtained by formula 1) and formula 2) as the actual flow; when the preset fluid medium is inconsistent with the measured fluid medium, the fluid medium and actual flow are obtained according to formula 1) and formula 2).

2. The method for synchronous detection of flow and substance according to claim 1, characterized in that: When the preset fluid medium is inconsistent with the measured fluid medium, the fluid medium and the actual flow rate are solved analytically: t With Q f It is a known quantity. Using the simultaneous equations of Formula 1) and Formula 2), the fluid medium n and the actual flow rate Q can be directly solved.

3. The method for synchronous detection of flow and substance according to claim 1, characterized in that: When the preset fluid medium is inconsistent with the measured fluid medium, the fluid medium and the actual flow rate are solved numerically: the difference between the actual flow rate Q is calculated according to formula 1) and formula 2), and the fluid medium n is repeatedly recursively adjusted until there is no difference between the actual flow rate Q calculated by formula 1) and formula 2). The specific execution process is as follows: A. Calculate the actual flow value Q1 according to formula 1), and calculate the actual flow value Q2 according to formula 2); B. Calculate ΔQ = Q1 - Q2; C. If ΔQ≠0, then Q a =(Q1+Q2) / 2 is used as the recursive actual flow value and is substituted into Formula 2) to calculate the recursive fluid medium n a , and n a Set as the preset fluid medium; D. Repeat A to C until ΔQ = 0. At this time, the preset fluid medium is the actual fluid medium, and the flow value obtained by the electrical system (3) according to formula 1) and formula 2) is the actual flow rate.

4. A flow and material synchronous detection device, characterized in that: Applicable to the method for synchronous detection of flow and substance according to any one of claims 1 to 3; the device for synchronous detection of flow and substance comprises a pipeline system (1), a sensor system (2) and an electrical system (3); The pipeline system (1) is connected to a flow measurement working condition pipeline, and the pipeline diameter of the pipeline system (1) is the same as the diameter of the flow measurement working condition pipeline; The sensing system (2) includes a thermal flow sensor (21) and a force flow sensor (22); the thermal flow sensor (21) and the force flow sensor (22) are respectively connected to the pipeline system (1), and the thermal flow sensor (21) and the force flow sensor (22) are in the same cross section to collect data and ensure that the fluid in the pipeline system (1) does not leak out; The electrical system (3) is connected to the sensing system (2), provides energy for the sensing system (2), receives signals from the sensing system (2), and performs analysis and calculation to obtain the flow rate and substance in the flow measurement working condition pipeline.

5. The flow and substance synchronous detection device according to claim 4, characterized in that: The thermal flow sensor (21) is of a constant power mode, where the heating power of the thermal flow sensor (21) is constant; or is of a constant temperature mode, where the operating temperature of the thermal flow sensor (21) is kept constant.

6. The flow and substance synchronous detection device according to claim 4, characterized in that: The force flow sensor (22) is a differential pressure flow sensor or a target flow sensor.

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