Vibration probe type solid-liquid two-phase flow meter and measuring method thereof

Abstract

The invention discloses a vibration probe type solid-liquid two-phase flow meter and a measuring method, a specially-made probe sensor is arranged in a pipeline to detect the frequency spectrum characteristics of vibration signals generated by collision of solid particles, and a calibration model is combined to synchronously obtain the fluid flow speed and the solid concentration. The device breaks through the limitation of a traditional electromagnetic flowmeter on the solid content and the particle size, has the advantages of being wide in measuring range, low in maintenance cost, high in anti-interference performance and the like, and is suitable for measuring high-concentration solid-liquid two-phase flow of mine tailings, building mud and the like.

Description

Technical Field

[0001] This invention belongs to the field of fluid measurement technology, specifically relating to a vibrating probe type solid-liquid two-phase flow meter and its measurement method suitable for solid-liquid two-phase flow with high solid content and large particles. Background Technology

[0002] Currently, electromagnetic flowmeters are mainly used for flow measurement of solid-liquid two-phase flows, but they have the following limitations:

[0003] 1. The solid content of the fluid being measured must be less than 30%, which cannot meet the requirements for measuring the flow rate of high-concentration solid-liquid mixtures;

[0004] 2. Strict limitations on solid particle size (usually not exceeding 2mm), making it difficult to apply to coarse particle conditions;

[0005] 3. Measurement accuracy is easily affected by changes in fluid conductivity, limiting its application scenarios.

[0006] With the increasing demand for measuring solid-liquid two-phase flows with high solids content (≥30%) and large particles (particle size >3mm) in fields such as mining, environmental protection, and chemical engineering, there is an urgent need to develop new measuring devices. This invention overcomes the limitations of traditional methods by using vibration probe sensing technology and vibration signal analysis technology. Summary of the Invention

[0007] The purpose of this invention is to provide a solid-liquid two-phase flow meter with a simple structure and a wide measurement range, which solves the problems of low solid content, small particle size and high maintenance cost in the prior art, and realizes the synchronous measurement of flow rate and concentration under high concentration and large particle conditions.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] This invention provides a vibration probe type solid-liquid two-phase flow meter and its measurement method, including a vibration probe sensor, a pipeline system and a signal processing system. The vibration probe sensor includes at least one set of probes vertically inserted into the inner wall of the pipeline, with the probe heads exposed in the fluid channel. The pipeline system includes a fluid channel and a fixing bracket. The signal processing system includes a signal conditioning module, a data acquisition card and a host computer.

[0010] Preferably, the vibration probe sensor is made of stainless steel, with a streamlined head design, a diameter of 3-10mm, and an insertion depth of 100% of the pipe diameter, that is, just penetrating the pipe diameter.

[0011] Preferably, three sets of vibration probe sensors are arranged along the axial direction of the pipe section, and the measurement accuracy is improved by multi-probe data fusion.

[0012] Preferably, the vibration signal is processed using a wavelet packet decomposition algorithm to extract energy spectrum features and frequency spectrum features as concentration and flow-sensitive parameters.

[0013] The present invention achieves the following beneficial technical effects compared to the prior art:

[0014] 1. The measurement process does not require the tube to be completely filled with material.

[0015] 2. Measurement is applicable to mixtures of solid particles and liquids with a coarse particle size range.

[0016] 3. The range of solid content has been effectively expanded. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 Schematic diagram of a dual-sided vibration probe sensor

[0019] Figure 2 Schematic diagram of a solid-liquid two-phase flow metering system

[0020] Figure 3 Signal processing flowchart

[0021] In the diagram: 1-Dual-sided vibration probe sensor; 2-Installation and mating pipe section; 3-Data acquisition instrument; 4-Host computer; 5-Vibration probe sensor mounting housing; 6-Radial elastic element; 7-Rigid rod; 8-Piezoelectric sensor; 9-Axial elastic element; 10-Mounting thread. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] The purpose of this invention is to provide a vibration probe type solid-liquid two-phase flow meter and its measurement method to solve the problems existing in the prior art.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] This embodiment provides a vibration probe type solid-liquid two-phase flow meter and its measurement method, such as Figure 1 As shown, the system includes a dual-sided vibration probe sensor 1, a mounting pipe section 2, a data acquisition instrument 3, and a host computer 4. The dual-sided vibration probe sensor 1 is installed in the pipeline under test through the mounting pipe section 2. The dual-sided vibration probe sensor 1 collects the vibration signal excited by the two-phase flow flowing through the mounting pipe section 2. The dual-sided vibration probe sensor 1 is connected to the data acquisition instrument 3 through a signal line and transmits the vibration signal to the data acquisition instrument 3 for preliminary processing. The data acquisition instrument 3 is connected to the host computer 4 through a data line and transmits the pre-processed signal to the host computer 4 for feature analysis and identification processing.

[0026] The dual-sided vibration probe sensor 1 includes a vibration probe sensor mounting housing 5, a radial elastic element 6, a rigid rod 7, a piezoelectric sensor 8, an axial elastic element 9, and mounting threads 10. A piezoelectric sensor 8 is fixedly connected to each end of the rigid rod 7. The piezoelectric sensor 8 is connected to the vibration probe sensor mounting housing 5 via the radial elastic element 6 and the axial elastic element 9. The vibration probe sensor mounting housing 5 has mounting threads 10 for mounting onto the mounting and mating pipe section 2.

[0027] The working principle of the vibration probe type solid-liquid two-phase flow meter and its measurement method provided by this invention is as follows:

[0028] When the solid-liquid two-phase flow passes through the installed pipe section 2, the solid particles collide with the rigid rod 7 of the double-sided vibration probe sensor 1, generating vibration. This vibration is transmitted to the piezoelectric sensor 8, which generates a vibration signal. Figure 3 The signal processing flow shown can obtain the frequency spectrum and energy spectrum of the vibration signal. Its frequency characteristics are related to the fluid flow velocity, and its energy spectrum characteristics are related to the solid concentration and particle size distribution. By analyzing the spectral characteristics (dominant frequency, harmonic components) and energy distribution (time domain amplitude, frequency domain integral energy) of the vibration signal, a bivariate mathematical model of flow velocity-frequency and concentration-energy is established. Combined with the calibration model, the fluid flow velocity and solid concentration are obtained simultaneously.

[0029] Specifically, the method consists of two parts:

[0030] Part 1: Establishment of the host computer judgment algorithm: Obtain the flow velocity-frequency mapping curve and the concentration-energy mapping relationship curve through several measurements. The mapping accuracy of the two curves is positively correlated with the number of measurements. The flow velocity-frequency mapping relationship and the concentration-energy mapping relationship are stored in the host computer.

[0031] Part Two: Measurement of flow rate and concentration of solid-liquid two-phase flow: The device is installed on the pipeline to be tested to obtain the frequency spectrum and energy spectrum of the vibration signal, which are then uploaded to the host computer 4. The host computer 4 retrieves the flow rate-frequency mapping relationship and the concentration-energy mapping relationship and compares them with the measured frequency spectrum and energy spectrum to determine the flow rate and concentration of the solid-liquid mixture to be tested.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vibratory probe type solid-liquid two-phase flow meter and a measurement method, characterized by: The hardware part comprises a double-side vibration probe sensor, a mounting and matching pipe section, a data acquisition instrument and an upper computer, the double-side vibration probe sensor is mounted in the measured pipeline through the mounting and matching pipe section, the double-side vibration probe sensor is connected with the data acquisition instrument through a signal line, and the data acquisition instrument is connected with the upper computer through a data line; The method comprises two parts: The first part is that the upper computer judges an algorithm: when the solid-liquid two-phase flow flows through the mounting and matching pipe section, the solid particles collide with the rigid rod of the double-side vibration probe sensor to generate vibration, and the vibration signal is generated to the piezoelectric sensor; through signal processing, the frequency spectrum and the energy spectrum of the vibration signal can be obtained, the frequency characteristics are related to the fluid flow rate, and the energy spectrum characteristics are related to the solid concentration and the particle size distribution; through several measurements, the flow rate-frequency mapping curve and the concentration-energy mapping relationship curve are obtained, the mapping accuracy of the two curves is positively related to the measurement times, and the flow rate-frequency mapping relationship and the concentration-energy mapping relationship are stored to the upper computer; The second part is solid-liquid two-phase flow and concentration measurement: the device is installed in the measured pipeline, when the solid-liquid two-phase flow flows through the mounting and matching pipe section, the solid particles collide with the rigid rod of the double-side vibration probe sensor to generate vibration, and the vibration signal is generated to the piezoelectric sensor; through signal processing, the frequency spectrum and the energy spectrum of the vibration signal can be obtained, and are uploaded to the upper computer; the upper computer compares the flow rate-frequency mapping relationship and the concentration-energy mapping relationship with the measured frequency spectrum and energy spectrum to determine the flow rate and the concentration of the measured solid-liquid mixture.

2. The vibrating probe type solid-liquid two-phase flow meter and measuring method according to claim 1, characterized by: The vibration probe sensor fixing shell, the radial elastic element, the rigid rod, the piezoelectric sensor, the axial elastic element and the mounting thread are arranged, the piezoelectric sensor is fixedly connected to the rigid rod at both ends, the piezoelectric sensor is connected with the vibration probe sensor fixing shell through the radial elastic element and the axial elastic element, and the vibration probe sensor fixing shell is mounted on the mounting and matching pipe section through the mounting thread.

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