Method for detecting liquid height in stirred tank reactor

A detection method and technology of liquid level height, applied in the direction of liquid/fluid solid measurement, instruments, measuring devices, etc., can solve the real situation that the liquid level height of the reactor cannot be determined, the operating temperature cannot be applied, and the liquid level cannot be obtained, etc. , to achieve the effects of sensitive response, low requirements for measurement conditions, and small measurement errors

Inactive Publication Date: 2009-09-16
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

At present, the liquid level detection instrument equipped on the industrial stirred tank reactor is a radiation liquid level detector using radioactive rays, which has some shortcomings, such as being harmful to the operator; the specific value of the liquid level cannot be obtained; when the operating conditions in the tank change Readings can also vary; and its main disadvantage is that it cannot be used at higher operating temperatures
The above problems ultimately lead to the operator being unable to determine the real situation of the liquid level in the reactor

Method used

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  • Method for detecting liquid height in stirred tank reactor
  • Method for detecting liquid height in stirred tank reactor
  • Method for detecting liquid height in stirred tank reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0026] use as figure 1 The cold mold device shown includes a stirring tank 1, a stirring paddle 2, a finger-shaped baffle and an air intake pipe 3, a flow meter 4, a fan 5, a stirring motor 6, a torque sensor 7, a digital display instrument 8, and an acoustic emission signal receiving device 9 is set below the liquid level of the outer wall of the stirred tank 1, and connected to the computer 12 through the preamplifier 10 and the amplifier 11 in turn, and the signal acquisition card and corresponding software are installed in the computer 12.

[0027] The dynamic acoustic emission signal inside the reactor enters the amplification device through the acoustic emission receiving device 9 arranged on the outer wall of the kettle to amplify the signal to ensure the long-distance transmission of the signal, and then enters the acquisition card in the computer 12 for A / D of the signal converted, and finally processed and analyzed by computer 12.

[0028] The inner diameter of the ...

Embodiment 2

[0034] The method of the invention is used to detect the liquid level height of a certain pilot-scale polyethylene slurry stirring reactor. The speed adjustment range of the pilot reactor is 50-200r / min. The acoustic emission signal is measured with an acoustic wave measuring instrument. The acoustic wave measuring instrument includes an acoustic wave receiving device, an amplifying device, a signal collecting device and a signal processing device. The acoustic sensor is placed at the bottom of the reactor, the sampling frequency is 100MHz, and the sampling time is 5s.

[0035] The medium used in the calibration experiment is water, and the liquid level in the kettle is changed by adding a known amount of water, and the acoustic emission signal is collected at the same time. The calibration experiment was carried out at five rotational speeds (80, 100, 120, 140, 160r / min), and the collected acoustic emission signal was transformed by FFT, and the average energy was obtained a...

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Abstract

The invention discloses a method for detecting the liquid height in a stirred tank reactor, including the following steps: (1)arranging an acoustic emission signal received device at the outer wall of the reactor; (2)receiving the acoustic emission signal in the stirred tank reactor; (3)selecting the average energy E of the acoustic emission signal at the wall of the stirred tank reactor as the characteristic variables; (4) judging the liquid height in the stirred tank reactor by the characteristic energy E of the acoustic emission signal stirred tank al at the wall of the stirred tank reactor according to the forecast model or standard curve of the predetermined characteristic variables E and the liquid height in the reactor. The acoustic emission signal received device for the method is non-inserted, and has convenient installation, safety and environment protection, sensitive response, accurate measure, wide application range and the like.

Description

technical field [0001] The invention relates to a method for detecting the liquid level height of a reactor, in particular to a method for detecting the liquid level height of a stirred tank reactor. Background technique [0002] The liquid level reflects the content of the material in the reactor. As an important operating parameter in the continuous chemical production, keeping it relatively stable is of great significance for controlling product performance and stable operation of the reactor. If the liquid level is too low or too high, it will cause abnormalities in the reactor. For the stirred tank reactor: the low liquid level will cause: 1) The average residence time of the catalyst is reduced, the yield is reduced, and the space-time yield of the reactor is reduced; 2) The liquid level in the reactor is too low, and the catalyst directly Spraying on the inner wall of the reactor or the bare surface of the agitator may produce fibrous and blocky polymers. A higher l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/296
Inventor 王靖岱王云兴汪兵黄正梁蒋斌波阳永荣
Owner ZHEJIANG UNIV
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