CN111664911A - System and method for detecting mud-water interface in thickener - Google Patents

Abstract

The invention relates to a system and method for detecting a mud-water interface in a concentrator, belonging to the field of mud-water interface detection. The detecting system comprises a pressure detecting device, a cleaning device and a controller (3); the pressure detecting device is composed of a ceramic pressure sensor (1) and a fixed The electrode plate (2) is composed, the cleaning device is composed of a pipeline (3), a nozzle (4) and a water pump (5). (6) It is connected with the pressure detection device and the cleaning device; the longitudinal pressure distribution inside the thickener is detected by the pressure sensor, the pressure data changes are analyzed, and the mud-water interface in the thickener is judged. The invention can accurately, reliably and real-time detect the mud-water interface of the concentrator, and has important practical significance for the pre-judgment of the settlement effect and the automatic control of the dosage of the flocculating agent.

Description

A system and method for detecting mud-water interface in a concentrator

technical field

The invention belongs to the field of mud-water interface detection, in particular to a mud-water interface detection method in a concentrator.

Background technique

Coal slime water is coal preparation wastewater, which is settled by the thickener to form a slime water interface. Above the mud-water interface in the thickener is the clear water layer, and the concentration of the coal mud water is low, which can be recycled as clear water; below the mud-water interface is the settlement area, where the coal mud water concentration is high, and the coal mud particles complete further settlement in this area; the greater the height of the clear water layer is , indicating that the sedimentation effect of coal slurry is better. The measurement of the mud-water interface of the slime water is an important parameter reflecting the sedimentation process of the slime water and the effect of the agent, and it is an evaluation index of the working effect of the thickener. Therefore, it is of great practical significance to study the detection technology of the mud-water interface of coal slurry to predict the settlement effect and automatically control the dosage of flocculants.

At present, the interface detection methods in the concentrator include spectrophotometer method, differential pressure method, ultrasonic method, capacitance method, γ-ray densitometer method and image processing detection method. The spectrophotometer method is suitable for the low concentration of coal slime water, and the scope of application is small. In recent years, the photoelectric sensor used inside the thickener has inaccurate detection due to the fact that the optical detection probe is covered with mud. The ultrasonic detection method uses the ultrasonic generator to send and receive signals to calculate the height of the clear water layer, but in the coal slime water system, the coal slime particle size composition is complex, and the coal slime water is in a forced rapid circulation system, the particle settlement time is short, and it is very difficult. It is difficult to form a clear solid-liquid interface, resulting in a large deviation of ultrasonic detection values and large data fluctuations.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a mature, accurate, stable, highly usable system and method capable of real-time detection of the mud-water interface in the thickener.

For solving the above-mentioned technical problems, the technical scheme of the present invention is:

A detection system for mud-water interface in a concentrator, comprising a pressure detection device composed of a ceramic pressure sensor 1 and a fixed electrode plate 2, a cleaning device composed of a pipeline 3, a nozzle 4 and a water pump 5, and a controller 6; a pressure detection device It is longitudinally installed on the inner wall of the thickener, the cleaning device is installed next to the pressure detection device, and the controller 6 is connected with the pressure detection device and the cleaning device.

The pressure detection device includes a plurality of ceramic pressure sensors 1, the ceramic pressure sensors 1 are longitudinally installed on the fixed electrode plate 2 at a fixed interval, and the wires are connected by shielded wires.

The cleaning device includes a plurality of nozzles 4, the nozzles 4 are fixed at a fixed interval, and the positions are corresponding to the ceramic pressure sensor 1, and are installed on the water pipe 3; the water pump 5 is connected with the water pipe 3 to provide strong water spray;

The controller 3 is a programmable controller for data acquisition and processing and control output.

A method for detecting a mud-water interface in a concentrator is to use a pressure sensor to detect the longitudinal pressure change distribution in the concentrator to judge the interface between a clear water layer and a turbid layer in the concentrator, so as to realize real-time monitoring of the mud-water interface; on the inner wall of the concentrator, A series of pressure sensors are installed vertically, and the controller collects and processes the pressure data in real time; in the clear water layer, the pressure increases linearly with the depth of the thickener, and when it passes through the mud-water interface to the settlement layer, the pressure changes nonlinearly, and there is an obvious nonlinear change. The inflection point is the interface; thus, the mud-water interface can be judged according to the real-time pressure detection data.

Compared with the prior art, the present invention has the following advantages:

1. The longitudinal multi-point pressure detection technology is adopted, and the detection accuracy is higher than that of turbidimeter and ultrasonic wave.

2. The ceramic pressure sensor is selected, which has strong high-voltage overload capacity, corrosion resistance, wear resistance, wide operating temperature range, and high electrical insulation.

The output signal is strong and the long-term stability is good.

3. The pressure sensor group can collect and transmit the pressure data in the concentrator in real time, and detect the mud-water interface in real time, so as to realize the prediction of the sedimentation effect of the coal mud and the water and the automatic control of the dosage of the flocculation agent.

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Description of drawings

FIG. 1 is a schematic structural diagram of the system of the present invention.

Detailed ways

As shown in FIG. 1 , the present invention provides a detection system for the mud-water interface in the thickener, including a pressure detection device composed of a ceramic pressure sensor 1 and a fixed electrode plate 2 , a cleaning device composed of a pipeline 3 , a nozzle 4 and a water pump 5 . device, and controller 6; the pressure detection device is longitudinally installed on the inner wall of the concentrator, the cleaning device is installed next to the pressure detection device, and the controller 6 is connected with the pressure detection device and the cleaning device.

As a preferred embodiment of the present invention, the pressure detection device includes a plurality of ceramic pressure sensors 1, the ceramic pressure sensors 1 are longitudinally flush-mounted on the fixed electrode plate 2 with a spacing of 50mm, the wires are connected by shielded wires, and the number of the ceramic pressure sensors 1 is based on the concentration Machine depth is determined.

As a preferred embodiment of the present invention, the cleaning device includes a plurality of nozzles 4, the distance between the nozzles 4 is 50mm, the positions of the nozzles 4 correspond to the ceramic pressure sensor 1, and are installed on the water pipe 3; the water pump 5 is connected to the water pipe 3 to provide strong water spray; The controller 6 is connected and controlled by the controller 6 .

As a preferred embodiment of the present invention, the pressure detection device and the cleaning device are each provided with 4 groups, which are installed on the inner side of the thickener against the wall, and are distributed in a longitudinal array around the thickener.

The controller 3 is a programmable controller for data collection and processing and control output, collects and processes the pressure data of the pressure sensor, and controls the cleaning device to work.

A method for detecting a mud-water interface in a concentrator is to use a pressure sensor to detect the longitudinal pressure change distribution in the concentrator to judge the interface between a clear water layer and a turbid layer in the concentrator, so as to realize real-time monitoring of the mud-water interface; on the inner wall of the concentrator, A series of pressure sensors are installed vertically, and the controller collects and processes the pressure data in real time; in the clear water layer, the pressure increases linearly with the depth of the thickener, and when it passes through the mud-water interface to the settlement layer, the pressure changes nonlinearly, and there is an obvious nonlinear change. The inflection point is the interface; thus, the mud-water interface can be judged according to the real-time pressure detection data.

The above content is a further detailed description of the present invention in conjunction with the specific preferred embodiments, and it cannot be considered that the specific embodiments of the present invention are limited to this. Below, some simple deductions or substitutions can also be made, all of which should be regarded as belonging to the invention and the scope of patent protection determined by the submitted claims.

Claims (5)

1. the detection system of mud-water interface in a thickener, it is characterized in that: comprise the pressure detection device that is made up of ceramic pressure sensor (1) and fixed pole plate (2), by pipeline (3), nozzle (4) and water pump (5) a cleaning device composed of, and a controller (6); the pressure detection device is longitudinally installed on the inner wall of the concentrator, the cleaning device is installed next to the pressure detection device against the wall, and the controller (6) is connected with the pressure detection device and the cleaning device . 2 . The detection system for the mud-water interface in a thickener according to claim 1 , wherein the pressure detection device comprises a plurality of ceramic pressure sensors ( 1 ), and the ceramic pressure sensors ( 1 ) are longitudinally installed at fixed intervals. 3 . On the fixed pole plate (2), the wires are connected by shielded wires. 3. The detection system of the muddy water interface in a thickener according to claim 1, characterized in that: the cleaning device contains a plurality of nozzles (4), the nozzles (4) have a fixed spacing, and the position is the same as that of the ceramic pressure sensor (1). ) corresponding to the water pipe (3); the water pump (5) is connected with the water pipe (3) to provide strong water spray; the water pump (5) is connected with the controller (6). 4 . The detection system of the muddy water interface in a thickener according to claim 1 , wherein the controller ( 3 ) is a programmable controller for data acquisition and processing and control output. 5 . 5. the detection method of the muddy water interface in the thickening machine described in claim 1-4, it is characterized in that: utilize the pressure sensor to detect the longitudinal pressure change distribution in the thickening machine to judge the interface of the clear water layer and the turbid layer in the thickening machine, Real-time monitoring of the mud-water interface is realized; a series of pressure sensors are installed vertically on the inner wall of the thickener, and the controller collects and processes the pressure data in real time; in the clear water layer, the pressure increases linearly with the depth of the thickener, and when it passes through the mud-water interface to the settlement layer, The pressure changes nonlinearly, and the inflection point where the obvious nonlinear change occurs is the interface; thus, the mud-water interface can be judged according to the real-time pressure detection data.

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