On-line detection method and on-line detection system for supernatant liquid height of settling tank for liquid-solid separation

A detection device and sedimentation tank technology, applied in the cross field, can solve the problems of laborious, time-consuming, and inability to continuously monitor the operation of the sedimentation tank, and achieve the effects of fast detection speed, continuous detection, and easy real-time control

Active Publication Date: 2013-12-25
毕诗文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, it is time-consuming and laborious, and it is impos

Method used

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  • On-line detection method and on-line detection system for supernatant liquid height of settling tank for liquid-solid separation
  • On-line detection method and on-line detection system for supernatant liquid height of settling tank for liquid-solid separation
  • On-line detection method and on-line detection system for supernatant liquid height of settling tank for liquid-solid separation

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Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1: the detection method that adopts the on-line detection device of liquid-solid separation settling tank supernatant liquid layer height, comprises the following steps:

[0059] Step 1. System initialization;

[0060] Step 2, the PLC control system controls the optical fiber head of the optical fiber sensor to descend;

[0061] The PLC control system drives the hoist, sends the optical fiber sensor from the top of the liquid level of the settling tank to the settling tank, and collects the output value of the rotary encoder and the DC voltage signal output Vout of the optical fiber sensor in real time. When the optical fiber sensor in this embodiment just enters the solution in the settling tank, the DC voltage signal output of the optical fiber sensor is Vout=4.96V (the range is 5V), which shows that the solution at the position where the optical fiber sensor is located has better light transmission and is a settling tank. In the clear liquid layer, the PL...

Embodiment 2

[0076] Embodiment 2: the detection method that adopts the on-line detection device of liquid-solid separation settling tank supernatant liquid layer height, comprises the following steps:

[0077] Step 1. System initialization;

[0078] Step 2, the PLC control system controls the optical fiber head of the optical fiber sensor to descend;

[0079] The PLC control system drives the hoist, sends the optical fiber sensor from the top of the liquid level of the settling tank to the settling tank, and collects the output value of the rotary encoder and the DC voltage signal output Vout of the optical fiber sensor in real time. When the optical fiber sensor in this embodiment just enters the solution in the settling tank, the DC voltage signal output Vout of the optical fiber sensor is 4.99V (the range is 5V), which shows that the solution at the position of the optical fiber sensor has better light transmission at this time, and it is a settling tank. In the clear liquid layer, the...

Embodiment 3

[0094] Embodiment 3: the detection method that adopts the on-line detection device of liquid-solid separation settling tank supernatant liquid layer height, comprises the following steps:

[0095] Step 1. System initialization;

[0096] Step 2, the PLC control system controls the optical fiber head of the optical fiber sensor to descend;

[0097] The PLC control system drives the hoist, sends the optical fiber sensor from the top of the liquid level of the settling tank to the settling tank, and collects the output value of the rotary encoder and the DC voltage signal output Vout of the optical fiber sensor in real time. When the optical fiber sensor in this embodiment just enters the solution in the settling tank, the DC voltage signal output of the optical fiber sensor is Vout=4.88V (the range is 5V), which shows that the solution at the position of the optical fiber sensor has better light transmission at this time, and it is a settling tank. In the clear liquid layer, the...

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Abstract

An on-line detection method and an on-line detection system for the supernatant liquid height of a settling tank for liquid-solid separation belong to the interdisciplinary field of mechanics, microelectronics, measurement and the like. The system comprises a PLC (Programmable Logic Controller) control system, an industrial computer, a printer, a windlass, a rotary encoder, a fiber optic sensor and a rotary washing tank; the PLC control system drives the windlass to send the fiber optic sensor into the settling tank; the fiber optic sensor feeds back an outputted direct-current voltage value to the PLC control system in real time; according to whether the direct-current voltage value abruptly drops or not, the PLC control system controls the windlass, and acquires the output value of the rotary encoder in real time to judge the dropping depth of the fiber optic sensor; after measurement is finished, the PLC control system drives the windlass to lift the fiber optic sensor out of the settling tank, and controls the rotary washing tank to wash the fiber optic sensor, cleaning off scale. The invention has the advantages of high measurement precision, high detection speed, convenience in maintenance, continuous detection and full-automatic real-time control.

Description

technical field [0001] The invention belongs to the intersecting fields of machinery, microelectricity, measurement and the like, and in particular relates to an online detection method and device for the height of a clear liquid layer in a liquid-solid separation settling tank. Background technique [0002] In alumina production or other wet processes, the slurry should be separated from liquid to solid in the separation settling tank, and the bottom flow of the settling tank will go to the washing settling tank for washing and separation. Settling tank operation often becomes the bottleneck of production, and it is very important to control its normal operation. Therefore, it is necessary to measure the height of the clear liquid layer of the settling tank from time to time during production. When the height of the clear liquid layer is maintained at 5-8m or above, it indicates that the production is normal When the height of the clear liquid layer drops below 3m, measures...

Claims

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Application Information

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IPC IPC(8): G01F23/292
Inventor 毕诗文
Owner 毕诗文
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