Flow and substance synchronous detection method and device

Abstract

The invention belongs to the technical field of flow measurement, and discloses a flow and substance synchronous detection method and device. The pipeline system is connected with the flow measurement working condition pipeline, and the pipeline diameter of the pipeline system is the same as that of the flow measurement working condition pipeline; the sensing system comprises a thermal flow sensor and a force flow sensor; the thermal flow sensor and the force flow sensor are respectively connected into a pipeline system to collect data; the electrical system is connected with the sensing system; and meanwhile, a signal sent by the sensing system is received, and the flow and the substances in the flow measurement working condition pipeline are obtained through analysis and operation. According to the flow and substance synchronous detection method and device provided by the invention, identification of abnormal conditions of fluid substances in the pipeline is realized, and synchronous detection of the flow and the substances is realized.

Description

Technical Field

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

[0002] Whether the flow rate and material state of the fluid 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 means of fluid material detection, the flow rate of the fluid can only be measured when the fluid is considered 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 time, but the flow measurement results will have huge deviations due to the difference between the preset medium and the actual medium of the flow sensor 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 can monitor the condition of fluid material while realizing flow sensing. When abnormality of 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 solution:

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

[0006] 1) Working pretreatment: 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 for 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 state 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 value 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 certain 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 is inconsistent with 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 obtains the flow value as the actual flow according to formula 1) and formula 2); when the preset fluid medium is inconsistent with the measured fluid medium, the fluid medium and the actual flow 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 is a known quantity. By using the simultaneous equations of Formula 1) and Formula 2), we can directly solve the fluid medium n and the actual flow rate Q.

[0014] Furthermore, when the preset fluid medium is inconsistent with the measured fluid medium, the fluid medium and the actual flow are solved numerically: the difference between the actual flow 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 Q calculated by formula 1) and formula 2). The specific execution process is as follows:

[0015] A. The actual flow value Q1 is calculated according to formula 1), and the actual flow value Q2 is calculated 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. Cycle 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 the analysis of formula 1) and formula 2) is the actual flow rate.

[0019] A flow and material synchronous detection device comprises 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;

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

[0023] Furthermore, the thermal flow sensor 21 is of a constant power type, and the heating power of the thermal flow sensor 21 is constant; or of a constant temperature type, and the working 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 material proposed in the present invention can realize the identification of abnormal conditions of fluid material in a pipeline and realize synchronous detection of flow and material. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of the flow and material synchronous detection device provided by the present invention;

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

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

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

[0030] The present invention is further described in detail below in conjunction with 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 and fixing the sensor system, and ensures the sealing of the sensor 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 thermal flow sensor 21 can work in a constant power mode, i.e. the heating power of the sensor is constant, or in a constant temperature mode, i.e. the working temperature of the sensor 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 sensor system 2 to work, receives the signal sent by the sensor 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 convection heat exchange intensity between the fluid and the sensor and the flow rate. Since the convection heat exchange 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 by 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 applied to the sensor by the flow of the fluid and the flow rate. The force applied to 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 rate Q can be expressed by formula 2).

[0038] Q=ρ(n,Q f )2)

[0039] According to formula 1) and formula 2), the actual fluid medium n and the 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 pretreatment: 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 through the sensing system 2; the electrical system 3 provides energy for 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 state 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 does not match 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; if the fluid medium is inconsistent with the measured fluid medium, the fluid material and actual flow are analyzed according to formula 1) and formula 2).

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

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

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

[0047] A. The actual flow value Q1 is calculated according to formula 1), and the actual flow value Q2 is calculated 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. Cycle 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.

[0051] In order to verify the rationality of the scheme, a flow and material synchronous detection device for the test was prepared, in which 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 material synchronous detection device is used to measure the flow rate and concentration of the helium and air mixed gas. 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 material, characterized in that: The steps include: 1) Working pretreatment: 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 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 value 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 certain 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; 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 according to formula 1) and formula 2) to obtain the actual flow; when the preset fluid medium is inconsistent with the measured fluid medium, the fluid medium and actual flow are analyzed according to formula 1) and formula 2).

2. The method for synchronous detection of flow and material 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 by analytical method: t With Q f is a known quantity. By using the simultaneous equations of Formula 1) and Formula 2), we can directly solve the fluid medium n and the actual flow rate Q.

3. The method for synchronous detection of flow and material 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. The actual flow value Q1 is calculated according to formula 1), and the actual flow value Q2 is calculated 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. Cycle 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.

4. A flow and material synchronous detection device, characterized in that: Applicable to any one of claims 1 to 3, wherein the flow rate and material synchronous detection device 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) comprises 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), the thermal flow sensor (21) and the force flow sensor (22) are in the same cross section, data is collected, and the fluid in the pipeline system (1) is ensured not to leak out; The electrical system (3) is connected to the sensing system (2), provides energy to the sensing system (2), receives signals sent by the sensing system (2), and performs analysis and calculation to obtain the flow rate and substance in the pipeline under the flow measurement working condition.

5. The flow and material synchronous detection device according to claim 4, characterized in that: 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.

6. The flow and material 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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