Multi-signal data acquisition method and multi-signal data acquisition instrument

Abstract

The invention belongs to the technical field of flow totators, and provides a multi-signal data acquisition method and a multi-signal data acquisition instrument, and the method comprises the steps: obtaining at least one type of signal data in a plurality of preset signal types; according to the obtained signal data and the flow quality mathematical model of the corresponding signal type, obtaining the flow quality needing to be collected; temperature and pressure compensation is carried out on the density in the flow mass mathematical model, and measurement errors caused by changes of working conditions such as temperature and pressure are reduced; meanwhile, the density of the gas with the pressure change rate larger than a preset value is corrected through pressure compensation; and for the superheated steam with the temperature change rate larger than the preset value and the pressure change rate larger than the preset value, temperature and pressure compensation is conducted on the density at the same time, a targeted compensation strategy is adopted for different media, and the measurement error is further eliminated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of flow totalizer, and particularly relates to a multi-signal data acquisition method and a multi-signal data acquisition instrument. BACKGROUND

[0002] The flow totalizer cooperates with the flow sensor and the transmitter to realize the measurement, conversion and totalization of mass flow and volume flow, and has the functions of heat calculation, display, recording and communication.

[0003] In the calculation of flow mass of the traditional flow totalizer, the compressible fluid such as gas and steam will cause measurement error due to the change of temperature and pressure and other working conditions, which affects the measurement accuracy; and the density change law of different media (such as saturated steam and superheated steam) is different, so the specific reasons for the change of measurement error are different, and the measurement error cannot be eliminated in a targeted manner. SUMMARY

[0004] In order to solve the above problems, the present application provides a multi-signal data acquisition method and a multi-signal data acquisition instrument, which compensates the density in the flow mass mathematical model for temperature and pressure, reduces the measurement error caused by the change of temperature and pressure and other working conditions; for the gas with a pressure change rate greater than a preset value, the density is corrected by pressure compensation; for the superheated steam with a temperature change rate greater than a preset value and a pressure change rate greater than a preset value, the density is compensated for temperature and pressure at the same time, and the targeted compensation strategy is adopted for different media to further eliminate the measurement error.

[0005] In order to achieve the above purpose, the present application is realized by the following technical scheme: In a first aspect, the present application provides a multi-signal data acquisition method, comprising: acquiring at least one type signal data in a plurality of preset signal types; obtaining the flow mass to be acquired according to the acquired signal data and the flow mass mathematical model of the corresponding signal type; wherein the density in the flow mass mathematical model is compensated, for the liquid with a temperature change rate greater than a preset value, the density is corrected by temperature compensation; for the gas with a pressure change rate greater than a preset value, the density is corrected by pressure compensation; for the superheated steam with a temperature change rate greater than a preset value and a pressure change rate greater than a preset value, the density is compensated for temperature and pressure at the same time.

[0006] Further, when the signal type is differential pressure, the flow mass is: or ； wherein, is a compensation coefficient. is density; is differential pressure.

[0007] Further, when the signal type is linear flow, the flow quality is: ; wherein, is the linear flow meter detection data.

[0008] Further, when the signal type is frequency, the flow quality is: ; wherein, is the frequency signal of the frequency flow meter.

[0009] Further, when the signal type is equivalent pulse, the flow quality is: ; wherein, is the equivalent pulse.

[0010] Further, the density is pressure-compensated: ; wherein, is the working density (unit: Kg / m3); is the compensation constant; is the compensation coefficient; is the pressure compensation input signal.

[0011] Further, the density is temperature-compensated: ; wherein, T is the temperature compensation input signal.

[0012] Further, the density is simultaneously temperature- and pressure-compensated: ; wherein, is the standard density; and are constants; is the pressure compensation signal; is the temperature compensation signal; is the atmospheric pressure.

[0013] In a second aspect, the present application also provides a multi-signal data acquisition system, comprising: a data acquisition module configured to acquire at least one type of signal data in a plurality of preset signal types; The acquisition module is configured to obtain the flow quality to be acquired according to the acquired signal data and the flow quality mathematical model corresponding to the signal type. In the flow quality mathematical model, the density is compensated, the density of the gas with a temperature change rate greater than a preset value is corrected by temperature compensation, the density of the gas with a pressure change rate greater than a preset value is corrected by pressure compensation, and the density of the superheated steam with a temperature change rate greater than a preset value and a pressure change rate greater than a preset value is simultaneously compensated by temperature and pressure.

[0014] In a third aspect, the present application further provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the steps of the multi-signal data acquisition method in the first aspect.

[0015] In a fourth aspect, the present application further provides an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the processor implements the steps of the multi-signal data acquisition method in the first aspect when executing the program.

[0016] In a fifth aspect, the present application further provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to implement the steps of the multi-signal data acquisition method in the first aspect.

[0017] Compared with the prior art, the present application has the following beneficial effects: In the present application, the density in the flow quality mathematical model is compensated by temperature and pressure, thereby reducing the measurement error caused by the change of temperature, pressure and other working conditions; for the gas with a pressure change rate greater than a preset value, the density is corrected by pressure compensation; for the superheated steam with a temperature change rate greater than a preset value and a pressure change rate greater than a preset value, the density is simultaneously compensated by temperature and pressure, and the targeted compensation strategy is adopted for different media, thereby further eliminating the measurement error. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of this implementation, are used to provide further understanding of this implementation, and the schematic embodiments of this implementation and the description thereof are used to explain this implementation, and do not constitute an improper limitation on this implementation.

[0019] Figure 1 The flow chart of the method of the first embodiment of the present application. DETAILED DESCRIPTION

[0020] The present application is further described below in combination with the accompanying drawings and embodiments.

[0021] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] Example 1: This embodiment provides a multi-signal data acquisition method, including: S1. Acquire multiple signal types: Optionally, differential pressure can be collected using a differential pressure flow meter. Linear flow rate is collected by a linear flow meter. Frequency is collected by a frequency-type flow meter. Data collected by a pulse flow meter .

[0023] S2. Determine the mathematical model for flow quality: S2.1 When the signal type is differential pressure, the flow quality for: or ; in, This is the compensation coefficient; Density; It represents differential pressure.

[0024] S2.2, When the signal type is linear flow, the flow quality for: ; in, This is data from a linear flow meter.

[0025] S2.3, When the signal type is frequency, the flow quality for: ; in, This refers to the frequency signal of a frequency-type flow meter.

[0026] S2.4, When the signal type is equivalent pulse, the flow quality for: ; in, It is an equivalent pulse.

[0027] S3, Pressure Compensation: Different media (such as saturated steam and superheated steam) exhibit different density variation patterns, leading to different specific reasons for measurement error variations. Therefore, it's impossible to eliminate measurement errors specifically for each medium. Based on this, different compensation methods are required for different media with varying density variation patterns. For liquid (such as water) or medium with significant temperature change (temperature change rate is greater than a preset value), liquid density is greatly affected by temperature, and pressure has negligible effect, at this time, density is corrected by temperature compensation. For gas (such as compressed air) with significant pressure change (pressure change rate is greater than a preset value) but stable temperature, gas density is proportional to pressure, and temperature fluctuation can be ignored when it is small, at this time, density is corrected by pressure compensation. Temperature change rate is the value of temperature rise or decrease in a preset time, and pressure change rate is the value of pressure rise or decrease in a preset time.

[0028] For the case where both temperature change (temperature change rate is greater than a preset value) and pressure change (pressure change rate is greater than a preset value) exist (overheated steam flow measurement), temperature and pressure compensation are performed on density at the same time.

[0029] S3.1, pressure compensation is performed on density: ; wherein, is working density (unit: Kg / m3); is compensation constant; is compensation coefficient; is pressure compensation input signal.

[0030] S3.2, temperature compensation is performed on density: ; wherein, is temperature compensation input signal.

[0031] S3.3, temperature and pressure compensation are performed on density at the same time: ; is density of the measured object under industrial standard conditions (atmospheric pressure is 0.10133 MPa, and temperature is 20℃); and are constants, and are optionally 273.15℃ and 0.10133 MPa respectively; is pressure compensation input signal; is temperature compensation input signal; is atmospheric pressure of the working point of the instrument.

[0032] S4, determination of compensation coefficient: S4.1, input signal is linear: flow input unit is volume (such as m 3 / h, etc.), =1, flow input unit is mass (such as T / h, etc.), and compensation coefficient is calculated according to corresponding mass flow calculation formula: ; S4.2, the input signal is frequency: The coefficient of the frequency flow transmitter is known, which can be set according to the factory calibration value, = flow coefficient of the frequency flow transmitter , the flow coefficient of the transmitter Unknown, can be calculated according to the corresponding mass flow calculation formula: ; Wherein, the flow coefficient The value of means the number of pulses / m3.

[0033] S4.3, the input signal is pulse: According to the corresponding mass flow calculation formula, the compensation coefficient is calculated: ; Wherein, the flow coefficient The value of means the number of pulses equivalent.

[0034] S4.4, the input signal is differential pressure: According to the corresponding mass flow calculation formula, the compensation coefficient is calculated: (Unsquare root); (Square root).

[0035] Embodiment 2: A multi-signal data acquisition instrument, comprising: The data acquisition module is configured to acquire at least one type of signal data in a plurality of preset signal types; The acquisition module is configured to obtain the flow quality to be collected according to the acquired signal data and the flow quality mathematical model corresponding to the signal type. Wherein, the density in the flow quality mathematical model is compensated, and for the hydraulic fluid with a temperature change rate greater than a preset value, the density is corrected by temperature compensation; for the gas with a pressure change rate greater than a preset value, the density is corrected by pressure compensation; for the superheated steam with a temperature change rate greater than a preset value and a pressure change rate greater than a preset value, the density is compensated by temperature and pressure simultaneously.

[0036] The working method of the multi-signal data acquisition instrument is the same as the multi-signal data acquisition method of embodiment 1, which will not be repeated here.

[0037] Embodiment 3: The embodiment provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to realize the steps of the multi-signal data acquisition method of embodiment 1.

[0038] Embodiment 4: The embodiment provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor implements the steps of the multi-signal data acquisition method in the embodiment 1 when executing the program.

[0039] Embodiment 5: The embodiment provides a computer program product, comprising a computer program, wherein the computer program is executed by a processor to implement the steps of the multi-signal data acquisition method in the embodiment 1.

[0040] The above merely describes the preferred embodiments of the present embodiment and is not intended to limit the present embodiment. The present embodiment can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A multi-signal data acquisition method, characterized in that, include: Acquire signal data of at least one of multiple preset signal types; Based on the acquired signal data and the corresponding signal type's traffic quality mathematical model, the traffic quality that needs to be collected is obtained; In the flow-quality mathematical model, density is compensated. For hydraulic fluid with a temperature change rate greater than the preset value, density is corrected through temperature compensation; for gas with a pressure change rate greater than the preset value, density is corrected through pressure compensation; and for superheated steam with both temperature and pressure change rates greater than the preset values, density is compensated for by both temperature and pressure.

2. The multi-signal data acquisition method as described in claim 1, characterized in that, When the signal type is differential pressure, the flow quality for: or ; in, The compensation coefficient; Density; It represents differential pressure.

3. The multi-signal data acquisition method as described in claim 2, characterized in that, When the signal type is linear flow, the flow quality for: ； in, This is data from a linear flow meter.

4. The multi-signal data acquisition method as described in claim 2, characterized in that, When the signal type is frequency, the flow quality for: ； in, This refers to the frequency signal of a frequency-type flow meter.

5. The multi-signal data acquisition method as described in claim 2, characterized in that, When the signal type is equivalent pulse, the flow quality for: ； in, It is an equivalent pulse.

6. The multi-signal data acquisition method as described in claim 1, characterized in that, Pressure compensation for density: ； in, Density under operating conditions (unit: kg / m3); This is the compensation constant; The compensation coefficient; This is the input signal for pressure compensation.

7. The multi-signal data acquisition method as described in claim 6, characterized in that, Temperature compensation for density: ； Where T is the temperature compensation input signal.

8. The multi-signal data acquisition method as described in claim 6, characterized in that, Density is compensated for by both temperature and pressure: ； in, Standard density; and It is a constant; This is a pressure compensation signal; This is a temperature compensation signal; Atmospheric pressure.

9. A multi-signal data acquisition instrument, characterized in that, include: The data acquisition module is configured to acquire signal data of at least one of a plurality of preset signal types; The acquisition module is configured to obtain the required traffic quality based on the acquired signal data and the traffic quality mathematical model corresponding to the signal type. In the flow-quality mathematical model, density is compensated. For hydraulic fluid with a temperature change rate greater than the preset value, density is corrected through temperature compensation; for gas with a pressure change rate greater than the preset value, density is corrected through pressure compensation; and for superheated steam with both temperature and pressure change rates greater than the preset values, density is compensated for by both temperature and pressure.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the multi-signal data acquisition method as described in any one of claims 1-7.

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