A method for measuring pipeline mud production and its implementation device

Abstract

A method and apparatus for measuring pipeline slurry production in the field of dredging technology includes the following steps: First, a single bubble generator is arranged upstream of the flow pipeline, and a three-layer electrode array is arranged downstream of the flow pipeline; Second, the slurry flow velocity is obtained by collecting and processing the voltage signal when the bubble flows through the outer two layers of the three-layer electrode array; the slurry concentration is obtained by collecting and processing the voltage signal of the middle layer of the three-layer electrode array; Third, the slurry production is calculated based on the slurry flow velocity and slurry concentration obtained in step two; wherein, the electrode devices on the middle layer of the three-layer electrode array are circumferentially and uniformly arranged on the wall of the flow pipeline; the electrode devices on the outer two layers of the three-layer electrode array are arranged at the upper end of the wall of the flow pipeline. This invention is reasonably designed, occupies little space, and can directly measure pipeline slurry production.

Description

Technical Field

[0001] This invention relates to a method for measuring mud production in the field of dredging technology, and in particular to a method and apparatus for measuring pipeline mud production with a single bubble generator and a three-layer electrode array. Background Technology

[0002] Pipeline mud concentration is a crucial parameter in pipeline transportation construction, and mud production measurement directly impacts project quantities. Current instruments for measuring pipeline mud concentration primarily include photoelectric concentration meters, ultrasonic concentration meters, and radioactive concentration meters. Photoelectric concentration meters have a short measurement range and are affected by color; ultrasonic concentration meters are limited by pipe diameter; and radioactive concentration meters pose environmental and safety hazards due to their radiation sources. Mud production measurement requires combining the flow rate measured by a flow meter with the concentration measured by a concentration meter. Flow meters and production meters are two different types of instruments, requiring significant installation space when used together; further integration and processing of the data collected from both are necessary to provide real-time production values. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention proposes a method and apparatus for measuring pipeline mud production, which not only occupies little space but also allows for direct measurement of pipeline mud production.

[0004] This invention is achieved through the following technical solution:

[0005] This invention provides a method for measuring the production of slurry in a ball-type pipeline, comprising the following steps: First, a single bubble generator is arranged upstream of the flow pipeline, and a three-layer electrode array is arranged downstream of the flow pipeline; Second, the slurry flow velocity is obtained by collecting and processing the voltage signal when the bubble flows through the outer two layers of the three-layer electrode array; the slurry concentration is obtained by collecting and processing the voltage signal of the middle layer of the three-layer electrode array; Third, the slurry production is calculated based on the slurry flow velocity and slurry concentration obtained in step two.

[0006] The three-layer electrode array has an even number of electrode devices on the middle layer electrode array, which are evenly arranged on the wall of the flow passage. The two outer layers of the three-layer electrode array also have an even number of electrode devices, which are arranged at the upper end of the wall of the flow passage. The two outer layers and the middle layer of the three-layer electrode array use excitation signals of different frequencies.

[0007] Furthermore, in the method of the present invention, the number of electrode devices on the intermediate layer electrode array is sixteen. The method for obtaining the mud concentration through the intermediate layer electrode array of the three-layer electrode array is as follows: fresh water / seawater is transported in the flow pipeline, and the boundary voltage U is measured. ij Slurry was transported within the flow pipeline, and the boundary voltage was measured to be V. ijThe unit is mV; the mud concentration c can be obtained through the back-projection imaging algorithm and the conductivity-mud formula:

[0008]

[0009]

[0010]

[0011] Among them, B Lij Ω represents the back projection coefficients, L is the Lth cell after the sensitive field is divided, and Ω is the back projection coefficient. ij For the back projection domain; σ m σ0 represents the conductivity of mud, in mS / cm; σ0 represents the conductivity of freshwater / seawater, in mS / cm; i represents the i-th excitation, j represents the j-th measurement; U ij V represents the boundary voltage between freshwater and seawater within the flow path, measured in mV. ij ν is the boundary voltage of the mud in the flow pipeline, in mV; c is the mud concentration obtained, in percentage.

[0012] Furthermore, in the method of the present invention, the number of electrode devices on the outer two layers of the three-layer electrode array is four each, and the method for obtaining the mud flow velocity through the outer two layers of the three-layer electrode array is as follows:

[0013] v = L / Δt;

[0014] Where v is the average flow velocity of the mud at the pipe cross-section, in meters per second; L is the distance between the two outer electrode layers, in meters; and Δt is the time difference between the bubbles traveling from the upstream outer electrode array to the downstream outer electrode array, in seconds.

[0015] This invention also provides an apparatus for implementing the above-mentioned method for measuring pipeline mud production, comprising a flow path, a pressure sensor, a single bubble generator, a three-layer electrode array, an exhaust pipe, a signal acquisition and processing system, a shielded signal line, and a data line; the pressure sensor, single bubble generator, three-layer electrode array, and exhaust pipe are arranged sequentially along the flow direction on the flow path, with the pressure sensor, single bubble generator, and exhaust pipe located at the upper end of the flow path; the middle layer of the three-layer electrode array has an even number of electrode devices, which are evenly distributed circumferentially on the wall of the flow path; the outer two layers of the three-layer electrode array each have an even number of electrode devices, which are located at the upper end of the wall of the flow path; the electrode devices on the three-layer electrode array are an integrated structure of electrode sheet and connecting post; the pressure sensor and single bubble generator are connected via a data line; the signal acquisition and processing system is connected to the electrode devices on the three-layer electrode array via a shielded signal line.

[0016] Furthermore, in the implementation device of the present invention, the flow passage is a horizontal pipe; the installation position of the single bubble generator is no more than one pipe diameter away from the pressure sensor, and the distance from the three-layer electrode array is no less than two pipe diameters.

[0017] Furthermore, in the embodiment of the present invention, the electrode devices on the intermediate layer electrode array have an electrode sheet width equal to the spacing between electrode sheets in the radial direction of the pipe, and the axial width of the electrode sheet is twice the radial width.

[0018] Furthermore, in the implementation device of the present invention, the signal acquisition and processing system includes a field-programmable gate array (FPGA) control module, a digital-to-analog converter (DAC) module, a signal acquisition and filtering module, an electrode gating module, an outer electrode array signal self-excitation module, and an intermediate layer electrode array signal self-excitation module. The FPGA control module is used to issue instructions and complete related calculations; the DAC module is used to convert electrical signals to digital signals; the signal acquisition and filtering module is used to acquire and filter signals; the electrode gating module is used to control the switching between excitation electrodes and acquisition electrodes; and the outer electrode array signal self-excitation module and the intermediate layer electrode array signal self-excitation module are used to generate current excitation signals. The FPGA control module communicates with the electrode devices on the outer two layers of the three-layer electrode array through the outer electrode array signal self-excitation module. The FPGA control module also communicates with the electrode devices on the intermediate layer electrode array of the three-layer electrode array through the DAC module, the signal acquisition and filtering module, the electrode gating module, and the intermediate layer electrode array signal self-excitation module.

[0019] Compared with the prior art, the present invention has the following advantages: the present invention is reasonably designed and has a simple structure. The implementation device only needs to be installed on a horizontal pipe section, which requires little installation space. It has a fast response speed, a high degree of automation and integration, and can provide production information in real time. It is safe, environmentally friendly, and easy to install. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the device for implementing the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the middle layer electrode array of the three-layer electrode array in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the outer two electrode arrays of the three-layer electrode array in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the signal acquisition and processing system in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the electrode device structure of the three-layer electrode array in an embodiment of the present invention;

[0025] The diagram is labeled as follows: 1. Flow line, 2. Pressure sensor, 3. Data line, 4. Single bubble generator, 5. Upstream outer electrode array, 6. Intermediate layer electrode array, 7. Downstream outer electrode array, 8. Shielded signal line, 9. Signal acquisition and processing system, 10. Exhaust pipe, 51. Electrode plate, 52. Connector post, 91. Field programmable gate array control module, 92. Digital-to-analog converter module, 93. Signal acquisition and filtering module, 94. Electrode selection module, 95. Downstream outer electrode array signal self-excitation module, 96. Upstream outer electrode array signal self-excitation module, 97. Intermediate layer electrode array signal self-excitation module, 98. Downstream outer electrode array terminal, 99. Intermediate layer electrode array terminal, 910. Upstream outer electrode array terminal. Detailed Implementation

[0026] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are based on the technical solutions of the present invention and provide detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments.

[0027] Example

[0028] The present invention is as described above. Figures 1 to 5 As shown, the present invention includes a flow path 1, a pressure sensor 2, a data line 3, a single bubble generator 4, an upstream outer electrode array 5, an intermediate layer electrode array 6, a downstream outer electrode array 7, a shielded signal line 8, a signal acquisition and processing system 9, and an exhaust pipe 10. The pressure sensor 2, single bubble generator 4, upstream outer electrode array 5, intermediate layer electrode array 6, downstream outer electrode array 7, and exhaust pipe 10 are sequentially arranged along the flow direction on the flow path 1. The pressure sensor 2, single bubble generator 4, and exhaust pipe 10 are located at the upper end of the flow path. The upstream outer electrode... The upstream outer electrode array 5, the intermediate layer electrode array 6, and the downstream outer electrode array 7 constitute a three-layer electrode array. The intermediate layer electrode array 6 has sixteen electrode devices, which are evenly arranged circumferentially on the wall of the flow passage and symmetrically distributed relative to the axis. The upstream outer electrode array 5 and the downstream outer electrode array 7 each have four electrode devices, which are arranged at the upper end of the wall of the flow passage 1. The electrode devices on the upstream outer electrode array 5, the intermediate layer electrode array 6, and the downstream outer electrode array 7 are all integral structures of electrode plates 51 and connecting posts 52. On the intermediate layer electrode array 6, the width of the electrode plates 51 in the radial direction of the pipe is equal to the spacing between the electrode plates 51, and the axial width of the electrode plates is twice the radial width.

[0029] The flow path 1 is a horizontal pipe. The single bubble generator 4 is installed at a distance from the pressure sensor 2 of no more than one pipe diameter, and at a distance from the upstream outer electrode array 5 of no less than two pipe diameters. The pressure sensor 2 is located at the top of the flow path 1 and is used to measure the pipe pressure near the single bubble generator 4. The pressure sensor 2 and the single bubble generator 4 are connected by a data cable 3. The pressure measured by the pressure sensor 2 is used as the pressurization pressure of the single bubble generator 4. The single bubble generator 4 produces continuous single bubbles, and the bubble plane size is approximately the same as the size of the electrode plate 51.

[0030] The signal acquisition and processing system 9 includes a field-programmable gate array (FPGA) control module 91, a digital-to-analog converter (DAC) module 92, a signal acquisition and filtering module 93, an electrode gating module 94, a downstream outer electrode array signal self-excitation module 95, an upstream outer electrode array signal self-excitation module 96, an intermediate layer electrode array signal self-excitation module 97, a downstream outer electrode array terminal 98, an intermediate layer electrode array terminal 99, and an upstream outer electrode array terminal 910. The FPGA control module 91, the downstream outer electrode array signal self-excitation module 95, and the downstream outer electrode array terminal 98 are connected in series via a wiring harness. The FPGA control module 91, the upstream outer electrode array signal self-excitation module 96, and the upstream outer electrode array terminal 910 are also connected in series via a wiring harness. The FPGA control module 91, the DAC module 92, the signal acquisition and filtering module 93, the electrode gating module 94, and the intermediate layer electrode array terminal 99 are also connected in series via a wiring harness. One end of the column signal self-excitation module 97 is connected to the wiring harness between the field programmable gate array control module 91 and the digital-to-analog converter module 92 via a wiring harness. The other end of the intermediate layer electrode array signal self-excitation module 97 is connected to the wiring harness between the electrode selection module 94 and the intermediate layer electrode array terminal 99 via a wiring harness. The wiring harness between the downstream outer electrode array signal self-excitation module 95 and the downstream outer electrode array terminal 98 is connected to the wiring harness between the upstream outer electrode array signal self-excitation module 96 and the upstream outer electrode array terminal 910 via a wiring harness. The downstream outer electrode array terminal 98 is connected to the lead-in post 52 of the upper electrode device of the downstream outer electrode array 7 via a shielded signal line 8. The upstream outer electrode array terminal 910 is connected to the lead-in post 52 of the upper electrode device of the upstream outer electrode array 5 via a shielded signal line 8. The intermediate layer electrode array terminal 99 is connected to the lead-in post 52 of the upper electrode device of the intermediate layer electrode array 6 via a shielded signal line 8. The field-programmable gate array control module 91 is used to issue instructions and complete related calculations; the digital-to-analog converter module 92 is used to convert electrical signals to digital signals; the signal acquisition and filtering module 93 is used to acquire and filter signals; the electrode gating module 94 is used to control the switching between the excitation electrode and the acquisition electrode; and the downstream outer electrode array signal self-excitation module 95, the upstream outer electrode array signal self-excitation module 96, and the intermediate layer electrode array signal self-excitation module 97 are used to generate current excitation signals.

[0031] The three-layer electrode array uses different frequency excitation signals for the outer two layers and the middle layer. The middle layer electrode array 6 uses a 50kHz excitation signal, while the upstream outer electrode array 5 and the downstream outer electrode array 7 use a 500kHz excitation signal. For the upstream outer electrode array 5 and the downstream outer electrode array 7, the acquired signals do not pass through the electrode selection module 94; instead, they are excited by the two outer electrode devices and measured by the two inner electrode devices. The middle layer electrode array 6 uses adjacent electrode excitation and adjacent electrode acquisition.

[0032] In the implementation of this invention, the mud concentration is first obtained through the intermediate layer electrode array 6; fresh water / seawater is transported in the flow pipeline, and the boundary voltage U is measured. ij Slurry was transported within the flow pipeline, and the boundary voltage was measured to be V. ij The unit is mV; the mud concentration c can be obtained through the back-projection imaging algorithm and the conductivity-mud formula:

[0033]

[0034]

[0035]

[0036] Among them, B Lij Ω represents the back projection coefficients, L is the Lth cell after the sensitive field is divided, and Ω is the back projection coefficient. ij For the back projection domain; σ m σ0 represents the conductivity of mud, in mS / cm; σ0 represents the conductivity of freshwater / seawater, in mS / cm; i represents the i-th excitation, j represents the j-th measurement; U ij V represents the boundary voltage between freshwater and seawater within the flow path, measured in mV. ij ν is the boundary voltage of the mud in the flow pipeline, in mV; c is the mud concentration obtained, in percentage.

[0037] Then, the mud flow velocity is measured using the upstream outer electrode array 5 and the downstream outer electrode array 7: When the bubbles generated by the bubble generator 4 pass through the upstream outer electrode array 5 and the downstream outer electrode array 7, they will cause fluctuations in the voltage measured by these two electrode arrays. The difference between the times t1 and t2 when the two electrode arrays have the maximum voltage is the time interval Δt from the time the bubble reaches the downstream outer electrode array 7 from the upstream outer electrode array 5, in seconds. The measured mud flow velocity is converted into the average flow velocity of the pipe cross section v = L / Δt, in meters per second; L is the distance between the upstream outer electrode array 5 and the downstream outer electrode array 7, in meters.

[0038] Finally, the data that caused the sudden change in the top electrode voltage when the bubble passed through the intermediate layer electrode array 6 were removed. The average of the measurements between t1 and t2 was taken, and the mud production at (t1+t2) / 2 was obtained as follows:

[0039]

[0040] Where D is the inner diameter of the pipe, in meters; c is the average mud concentration, which is the average of the mud concentration measurements taken between time t1 and t2, in percentage; and Q is the mud production, in cubic meters per second.

[0041] The specific operation of the present invention has been described above. It should be understood that the present invention is not limited to the specific operation described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of the present invention.

Claims

1. A method for measuring pipeline mud production, characterized in that, Includes the following steps: First, the pressure sensor, single bubble generator, three-layer electrode array, and exhaust pipe are arranged sequentially along the flow direction on the flow pipeline. The pressure sensor, single bubble generator, and exhaust pipe are arranged upstream of the flow pipeline, and the three-layer electrode array is arranged downstream of the flow pipeline. Based on the signal obtained from the pressure sensor, the pressure of the single bubble generator is adjusted to obtain the target bubble; Second, the excitation signal for the intermediate layer electrode array is 50kHz, and the excitation signal for the upstream and downstream outer electrode arrays is 500kHz. The voltage signal is simultaneously collected and processed when the bubble flows through the outer two layers of the three-layer electrode array to obtain the time it takes for the target bubble to pass through, and then obtain the bubble velocity, which is the flow velocity of the mud. The mud concentration is obtained by collecting and processing the voltage signal of the intermediate layer electrode array of the three-layer electrode array. Third, the data that caused the voltage change of the top electrode when the bubble passed through the middle layer electrode array were removed. The average of the measured concentration values ​​of the bubble between the time t1 and t2 when it passed through the outer electrode was taken. The mud production at time (t1+t2) / 2 was obtained by using this concentration value and the above-measured flow rate value. The three-layer electrode array has an even number of electrode devices on the middle layer electrode array, which are evenly arranged on the wall of the flow passage. The two outer layers of the three-layer electrode array also have an even number of electrode devices, which are arranged at the upper end of the wall of the flow passage. The two outer layers and the middle layer of the three-layer electrode array use excitation signals of different frequencies.

2. An apparatus for implementing the pipeline mud production measurement method of claim 1, characterized in that, Includes flow piping, pressure sensor, single bubble generator, three-layer electrode array, exhaust pipe, signal acquisition and processing system, shielded signal line, and data line; The middle layer of the three-layer electrode array has sixteen electrode devices, which are evenly arranged on the wall of the flow passage. The outer two layers of the three-layer electrode array each have four electrode devices, which are arranged at the upper end of the wall of the flow passage. The method of excitation by two outer electrode devices and measurement by two inner electrode devices is adopted. The electrode device on the three-layer electrode array is an integrated structure of electrode sheet and lead post; The pressure sensor and the single bubble generator are connected via a data cable; The signal acquisition and processing system is connected to the electrode device on the three-layer electrode array via a shielded signal line.

3. The implementing apparatus for the pipeline mud production measurement method according to claim 2, characterized in that... The flow path is a horizontal pipe; the installation position of the single bubble generator is no more than one pipe diameter away from the pressure sensor, and no less than two pipe diameters away from the three-layer electrode array.

4. The apparatus for implementing the pipeline mud production measurement method according to claim 2, characterized in that... The electrode devices on the intermediate layer electrode array have an electrode sheet width equal to the spacing between electrode sheets in the radial direction of the pipe, and the axial width of the electrode sheet is twice the radial width.

5. The implementing apparatus for the pipeline mud production measurement method according to claim 2, characterized in that... The signal acquisition and processing system includes a field-programmable gate array control module, a digital-to-analog converter module, a signal acquisition and filtering module, an electrode gating module, an outer electrode array signal self-excitation module, and an intermediate layer electrode array signal self-excitation module. The field-programmable gate array control module is used to issue instructions and complete related calculations; the digital-to-analog conversion module is used to convert electrical signals to digital signals; the signal acquisition and filtering module is used to acquire and filter signals; the electrode gating module is used to control the switching between the excitation electrode and the acquisition electrode; and the outer electrode array signal self-excitation module and the middle layer electrode array signal self-excitation module are used to generate current excitation signals. The field-programmable gate array control module communicates with the electrode devices on the outer two layers of the three-layer electrode array through the outer electrode array signal self-excitation module. The field-programmable gate array control module communicates with the electrode devices on the intermediate layer electrode array of the three-layer electrode array through a digital-to-analog conversion module, a signal acquisition and filtering module, an electrode selection module, and an intermediate layer electrode array signal self-excitation module.

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