Efficient, continuous and intelligent system for monitoring thickness of slime water clear water layer on line

Abstract

The invention discloses an efficient, continuous and intelligent system for monitoring the thickness of a slime water clear water layer on line. The system comprises an adjusting distance measuring unit, a slime water turbulence box, a slime water concentration monitoring unit and a control unit. The change of the concentration of the slime water is quantitatively judged by utilizing the change ofthe light attenuation amount after light penetrates through equal-thickness water flow; non-contact detection of the distance measuring sensor and slime water is achieved, coal slime water can be effectively prevented from polluting the distance measuring sensor, and relatively high detection precision and stability of detection data are kept. The dosage of the flocculating agent can be adjustedin time, and the production economy and the safe and stable operation of a production system are ensured; manual participation is not needed, and labor intensity of workers is reduced; the investmentis low and the production period is short.

Description

Technical field: [0001] The invention belongs to the technical field of on-line monitoring of coal slime water, in particular to an efficient, continuous and intelligent online monitoring system for the thickness of a clear water layer of coal slime water. Background technique: [0002] There are many kinds of coal preparation methods, which can be divided into two categories according to whether the coal preparation process uses aqueous media: dry coal preparation and wet coal preparation. At present, the most widely used coal preparation method in my country's coal preparation plants is wet coal preparation, specifically including jigging coal preparation and dense medium coal preparation. Wet coal preparation requires that the selected coal be separated from gangue in the water medium according to its density characteristics. After the coal passes through the water medium, most of the fine particles (less than 0.75mm) are left in the water by the selected coal to form a c...

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Problems solved by technology

[0003] Under normal production process conditions, the thickness of the upper clear water layer in the concentration tank is required to be kept between 0.8 and 3 meters. When the thickness of the clear water layer is less than 0.8 meters, it is necessary to increase the amount of flocculant added, otherwise the circulating water used for production will be polluted. The instability of the production process system affects the continuity of normal production; when the thickness of the clear water layer is higher than 3 meters, it is necessary to reduce the amount of flocculant added, because the large amount of flocculant causes poor water permeability and air permeability of the coal slime, which leads to the dehydration efficiency of the coal slime during the production process Significant decline, the production economic benefits of the coal preparation plant will be greatly affected, and in severe cases, the production system will be paralyzed and environmental pollution accidents will be caused

[0004] At present, there are two detection methods for detecting the thickness of the clear water layer. One is to use the ultrasonic sludge interface instrument to realize continuous detection, and to feed back and display the electrical signal. The sensor of the ultrasonic sludge interface instrument needs to be completely immersed in the measured coal slime water Due to the high concentration of slime water in the pool (the solid particle content is 5-100g / l, about 50% of the particle size is less than 0.045mm), the solid particles in the slime water are very easy to attach to the surface of the sensor immersed in water. Long, the impact on the detection accuracy of the sensor is constantly increasing. In order to solve this problem, the subsequent improvement method of the manufacturer is to add a cleaning brush on the surface of the sensor to clean it, but the effect is still not very satisfactory, and the current application effect is poor; the other is the traditional one. Manual detection, that is, every 1-2 hours during the production process, the thickness of the clear water layer is manually detected with a transparent probe rod, which is used to guide production

This detection method has the following disadvantages: 1. The workload of manual detection is large. Each detection requires manual work with a probe rod about 4 meters long, and the probe rod needs to be disassembled and rinsed with clean water; 2. The accuracy of manual detection is unstable. , vary from person to person, and there is subjectivity; 3. Due to the slime pollution of the one-way valve under the transparent probe rod in the environment with high concentration, the one-way valve is not opened in time or closed tightly, which affects the detection accuracy; 4. . Manual detection has the risk of the probe rod falling into the concentration pool. If the probe rod falls into the concentration pool, it may cause other process accidents such as pipeline and pump blockage or damage; 5. Online real-time detection and online control cannot be realized. The data provided by the test It is the interval value, and there is a hysteresis in the adjustment of dosing

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