System and method for ultrasonic solid-liquid mixture slurry concentration detection

Abstract

The invention discloses an ultrasonic solid-liquid mixture slurry concentration detection system and method, a piece of ceramic is adopted, one surface of the ceramic is in contact with a medium, the other surface of the ceramic can receive high-frequency ultrasonic waves, and the ultrasonic waves are reflected on the other surface of the ceramic after being transmitted from one surface; the intensity of the reflected signal is determined by the density of the medium, and the density of the medium can be calculated in a brief introduction manner when the intensity of the signal is measured. Effective echoes are formed, so that the measurement effect is improved; and meanwhile, a high-precision temperature sensor is integrated, so that the signal intensity can be corrected in real time. When the temperature change range of the slurry is large, the received signal does not have large difference even under the condition that the concentration is not changed, and therefore accurate judgment is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of solid mixture measurement, and in particular relates to a system and method for ultrasonic solid-liquid mixture slurry concentration detection. Background Art

[0002] Traditional concentration meters are mainly used to detect the density of pure liquids or gases, and are rarely able to detect the concentration of solid-liquid mixtures.

[0003] Ultrasonic solid-liquid mixture concentration meter is an online detection instrument with advantages such as no radiation pollution and easy installation. The proprietary technology eliminates the influence of bubbles in the medium and the change of slurry flow rate, and the on-site installation and calibration are simple. It can be suitable for different types of solid-liquid mixture slurry concentration detection and has the advantages of automatic temperature compensation function.

[0004] Ultrasonic attenuation measurement is based on the fact that when ultrasonic waves propagate in a uniform suspension such as slurry, their amplitude changes with the amount of solids in the measured slurry and the size of the particles. As long as the attenuation of the ultrasonic wave passing through the measured slurry is measured, the concentration of the measured slurry can be known. Under certain conditions, when the particles in the slurry are very small, viscous absorption attenuation plays a major role; when the particles are very large, scattering attenuation plays a major role.

[0005] However, in actual use, there are the following disadvantages: (1) When the slurry contains a large number of bubbles, the emitted high-frequency ultrasonic waves will be scattered and unable to form effective echoes, resulting in measurement failure.

[0006] (2) When the temperature of the slurry varies greatly, the received signal will have large differences even when the concentration remains unchanged, which may cause misjudgment. Summary of the invention

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a system and method for ultrasonic solid-liquid mixture slurry concentration detection to solve the above-mentioned problems.

[0008] To achieve the above object, the present invention adopts the following technical solution: a system and method for ultrasonic solid-liquid mixture slurry concentration detection, comprising the following steps: (1) Combine the ultrasonic acoustic impedance mineral concentration meter and the ultrasonic probe and install them in an integrated manner on the measuring pipe. The instrument is electrically connected to the remote display screen through a cable interface. The remote display screen is installed in a place where it is convenient for observation. (2) When using an integrated installation, the cable interface needs to be connected to a 24V power supply, and the 4-20mA analog output line and RS485 signal line need to be connected as needed; if a 220V power supply is used, an external 220V to 24V power module is required, and the 24V output of the power module is connected to the instrument; (3) The remote controller can be used to set various parameters of the ultrasonic acoustic impedance slurry concentration meter. The remote controller uses infrared control and has 20 buttons, including the power button, menu button, up, down, left, right buttons, confirm button, return button and ten number buttons; (4) Both ends of the test pipe are equipped with mounting flanges and are installed on straight pipe sections; (5) The cable is connected to the instrument through the waterproof connector and plugged into the terminal interface through the connector plug. When inserting the terminal, be sure to insert it to the bottom to ensure a reliable connection; (6) The ultrasonic acoustic impedance slurry concentration meter is used normally and outputs the required parameters, mainly including output type, device address, output mode, etc.

[0009] (7) A piece of ceramic is installed on the system. One side of the ceramic contacts the medium, and the other side receives high-frequency ultrasonic waves. A high-precision temperature sensor is also integrated to correct the signal strength in real time. (8) After the ultrasonic acoustic impedance slurry concentration meter is installed, it can start normal operation after powering on and setting up the system.

[0010] The beneficial effects of the present invention are: 1. The present invention uses a piece of ceramic, one side of the ceramic is in contact with the medium, and the other side receives high-frequency ultrasonic waves. After the ultrasonic waves are transmitted from one side, they are reflected on the other side of the ceramic. The intensity of the reflected signal is determined by the density of the medium. By measuring the signal intensity, the density of the medium can be simply calculated. The ultrasonic wave will not penetrate the liquid and reflect to the bottom wall of the tube, so it will not be affected by bubbles, forming an effective echo, thereby improving the measurement effect.

[0011] 2. The present invention also integrates a high-precision temperature sensor, which can correct the signal strength in real time. When the temperature of the slurry varies greatly, the received signal will not have a large difference even if the concentration remains unchanged, thus making an accurate judgment. DETAILED DESCRIPTION

[0012] In order to better understand the present invention, the technical solution of the present invention is described in detail with specific examples below.

[0013] A system and method for ultrasonic solid-liquid mixture slurry concentration detection, comprising the following steps: (1) Combine the ultrasonic acoustic impedance mineral density meter and the ultrasonic probe and install them in an integrated manner on the measuring pipeline to measure the density of the ore pulp. The model uses the ps7000 ultrasonic acoustic impedance mineral density meter instrument, which has completely existing technology, high precision, strong anti-interference ability, stable and reliable performance, and convenient operation and maintenance. There is a visual window on the instrument to display the measurement results and set the instrument parameters. The instrument is electrically connected to the remote display screen through a cable interface. The remote display screen is installed in a convenient place for observation. The remote display screen uses a digital tube to display the measurement results of the instrument; ultrasonic waves are suitable for measuring the concentration and density of ore pulp. Bubbles are allowed in the liquid, and there cannot be a large amount of suspended matter and sediment in the liquid. The measured pipeline requires a pipe diameter of DN50-DN1000 and is installed in a straight pipe section, and does not require a full pipe.

[0014] (2) When using an integrated installation, the cable interface needs to be connected to a 24V power supply, and the 4-20mA analog output line and RS485 signal line need to be connected as needed; if a 220V power supply is used, an external 220V to 24V power module is required, and the 24V output of the power module is connected to the instrument; (3) The remote controller can be used to set various parameters of the ultrasonic acoustic impedance slurry concentration meter. The remote controller uses infrared control and has 20 buttons, including the power button, menu button, up, down, left, right buttons, confirm button, return button and ten number buttons; (4) Both ends of the test pipe are equipped with mounting flanges and are installed on a straight pipe section; the ultrasonic acoustic impedance slurry concentration meter is installed using a straight pipe and supports two installation methods: integrated installation and split installation. The installation is convenient for use and observation. When the pipe is not full, it is more convenient to use the split installation. The present invention adopts an integrated installation method. The sensor is not affected by process pressure, fluid wear and corrosion by flange installation; the straight pipe section installation has fewer constraints on the straight pipe section, is not easy to cause structure or blockage, and reduces maintenance costs; (5) The cable is connected to the instrument through the waterproof connector and plugged into the terminal interface through the connector plug. When inserting the terminal, be sure to insert it to the bottom to ensure a reliable connection; (6) The ultrasonic acoustic impedance slurry concentration meter is used normally and outputs the required parameters, mainly including output type, device address, output mode, etc.

[0015] (7) A piece of ceramic is installed on the system. One side of the ceramic contacts the medium, and the other side receives high-frequency ultrasonic waves. A high-precision temperature sensor is also integrated to correct the signal strength in real time. Acoustic impedance measurement formula: ZI=PI*CI ZI = Acoustic Impedance PI = Slurry density CI = Speed ​​of sound Sound attenuation measurement formula: e=Er / Es Er=Signal received strength / energy Es=Signal emission strength / energy Sound velocity measurement formula: v = d / t; (t = t1- t0) t0 = signal transmission time t1 = signal receiving time d = probe distance (8) After the ultrasonic acoustic impedance slurry concentration meter is installed, it can start normal operation after powering on and setting up the system.

[0016] Main parameters of ultrasonic acoustic impedance slurry concentration meter: After power on, the ultrasonic acoustic impedance slurry concentration meter automatically turns on. After power on, the system starts to initialize. After initialization, enter the main interface. The dot on the left side of the main interface flashes, indicating that the ultrasonic acoustic impedance slurry concentration meter is working. The slurry density is displayed in the middle. The slurry density can have three display modes: mass concentration, volume concentration and density, which can be set in the menu.

[0017] The following displays the results of the three measurement output modes: 4-20mA analog output 1, 4-20mA analog output 2, and RS485 output.

[0018] T1: 4-20mA analog output 1 result, unit mA; T2: 4-20mA analog output 2 result, unit mA; I1: RS485 output.

[0019] The ultrasonic acoustic impedance slurry concentration meter needs to be properly set up for normal operation. Press the Menu button on the remote control to enter the menu setting interface.

[0020] The menu interface includes six parts: Quick Settings, Basic Settings, Advanced Settings, Security Settings, Display Settings and System Settings. Use the up and down keys to select the setting content, and use the OK key to select the required setting.

[0021] After selecting the setting item you want to set, press the OK button to display the current setting. Press the OK button again to modify the setting. After changing the setting, you need to return to the main interface for the setting item to take effect.

[0022] The quick setting includes two items: low range and high range.

[0023] Basic settings are mainly used to set some basic parameters of the ultrasonic acoustic impedance slurry concentration meter, including address, baud rate, outlier filter type, DC removal type, filter type, measured medium density, solvent density, environmental correction factor a, and environmental correction factor b.

[0024] Used to set the device address of RS485 interface, the default value is 1. Users need to allocate addresses according to the devices connected to RS485 bus. The address of ultrasonic acoustic impedance slurry concentration meter needs to be different from other devices.

[0025] The density of the solid matter in the slurry needs to be set according to the actual application scenario, which is used to calculate the volume concentration and density. For example, the density of iron ore and potassium salt. The density of the solvent in the slurry needs to be set according to the actual application scenario, which is used to calculate the volume concentration and density. Generally, it is water. Set to 1g / cm3.

[0026] Advanced settings are mainly used for analog output 1, analog output 2, output correction coefficient, analog output 4mA corresponding value, analog output 20mA corresponding value and measurement damping. The output type of analog output can be set to density, volume concentration or mass concentration. The output result of the ultrasonic acoustic impedance slurry concentration meter can be corrected to a certain extent. The damping value of the measured value output is set in seconds. The measurement interval is used to set the interval time between two measurements of the ultrasonic acoustic impedance slurry concentration meter. The unit is ms, and the maximum value is 10 seconds.

[0027] Safety settings are used to set the analog output current of the ultrasonic acoustic impedance slurry concentration meter when it fails to detect itself, as well as the data storage settings.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A system and method for ultrasonic solid-liquid mixture slurry concentration detection, characterized in that: The following steps are involved: (1) Combine the ultrasonic acoustic impedance mineral concentration meter and the ultrasonic probe and install them in an integrated manner on the measuring pipe. The instrument is electrically connected to the remote display screen through a cable interface. The remote display screen is installed in a place where it is convenient for observation. (2) When using an integrated installation, the cable interface needs to be connected to a 24V power supply, and the 4-20mA analog output line and RS485 signal line need to be connected as needed; if a 220V power supply is used, an external 220V to 24V power module is required, and the 24V output of the power module is connected to the instrument; (3) The remote controller can be used to set various parameters of the ultrasonic acoustic impedance slurry concentration meter. The remote controller uses infrared control and has 20 buttons, including the power button, menu button, up, down, left, right buttons, confirm button, return button and ten number buttons; (4) Both ends of the test pipe are equipped with mounting flanges and are installed on straight pipe sections; (5) The cable is connected to the instrument through the waterproof connector and plugged into the terminal interface through the connector plug. When inserting the terminal, be sure to insert it to the bottom to ensure a reliable connection; (6) The ultrasonic acoustic impedance slurry concentration meter is used normally and outputs the required parameters, mainly including output type, device address, and output mode; (7) A piece of ceramic is installed on the system. One side of the ceramic contacts the medium, and the other side receives high-frequency ultrasonic waves. A high-precision temperature sensor is also integrated to correct the signal strength in real time. (8) After the ultrasonic acoustic impedance slurry concentration meter is installed, it can start normal operation after powering on and setting up the system.