Method for testing operating parameter of stirring kettle

A technology of operating parameters and detection methods, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze fluids, etc., can solve the problems of low accuracy, cumbersome process, easy blockage, etc., and achieves low requirements for measurement conditions, simple and convenient installation, and small measurement error. Effect

Inactive Publication Date: 2008-07-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for stirred tank reactors, the sampling method is less and less suitable for the harsh industrial production environment due to the disadvantages of cumbersome process, plug-in type and easy blockage; the observation method is simple in principle and convenient in measurement, but due to its low precision High, limited application range, not suitable for opaque stirring devices; light attenuation technology as a non-invasive measurement method, its sensitivity is not high, and it is also not suitable for non-transparent reactors

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  • Method for testing operating parameter of stirring kettle
  • Method for testing operating parameter of stirring kettle
  • Method for testing operating parameter of stirring kettle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Solid-liquid mixed system, laboratory cold mold experiment, measurement of critical stirring speed.

[0042] The inner diameter of the stirred tank is 110mm, the material is plexiglass, the experimental medium is water and glass beads, and the density of water is 1.0×10 3 kg·m -3 , the density of glass beads is 2.9×10 3 kg·m -3 , The particle diameter is 0.7mm. The stirring paddle is a paddle-type impeller with a diameter of 65 mm and 600 ml of water. The test speed is 3.33~10.83r·s -1 , the apparent concentration of the slurry is 0.008~0.032g·ml -1 , the acoustic emission signal sampling frequency is 100KHz.

[0043] The collected acoustic emission signal is decomposed by second-order Daubechies 9 scale wavelet and R / S fractal technology is used to select the acoustic emission signal in the characteristic frequency band with Hurst value less than 0.5 as the acoustic signal energy fraction R representing the movement of solid particles s . Investigate R s The v...

Embodiment 2

[0048] For the solid-liquid mixed system, the same laboratory cold model test as in Example 1 was carried out to measure the suspension height and liquid level of the slurry.

[0049] The acoustic emission receiving device is placed on the side wall of the stirred tank, and the test speed is 8.33r s -1 . Serum concentration is 0.016g·ml -1 , the particle diameter is 0.7mm, and the sampling frequency is 1000KHz.

[0050] The collected acoustic emission signal is decomposed by the second-order Daubechies 9 scale wavelet and the R / S fractal technology is used to obtain the energy value E of the acoustic signal representing the movement of solid particles s , examine E s The change law with the axial direction of the stirred tank is shown in Figure 4.

[0051] According to the criterion, the height corresponding to the boundary position between the first and second areas is the slurry suspension height, and the height corresponding to the boundary position between the second a...

Embodiment 3

[0055] Gas-liquid-solid mixed system, slurry polyethylene pilot plant, measuring the critical stirring speed, the acoustic emission receiving device is placed at the static liquid level of 2 / 5 of the side wall of the stirred tank.

[0056] The volume of the test kettle is 10L, the material is stainless steel, the main raw material is high-purity ethylene, a small proportion of propylene or 1-butene is used as a comonomer, hydrogen is used as a molecular weight regulator, hexane is used as a solvent, and tetrachloromethane is used. Titanium oxide / magnesium ethoxide supported high-efficiency Z-N catalyst reacts at a temperature of 87°C and a pressure of 0.8MPa to produce polyethylene. A gas-liquid-solid three-phase system consisting of ethylene gas, n-hexane solvent and polyethylene solid is formed in the reactor. The stirring impeller is a disc-type turbine impeller with a diameter of 30cm and a sampling frequency of 100KHz.

[0057] The energy fraction R of the acoustic signa...

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Abstract

The invention discloses an operating parameter detection method of stirring tank, which comprises (1), arranging an acoustic emission signal receiver on the wall of a stirring tank, (2), receiving the acoustic emission signal from the stirring tank, (3), using second-order Daubechies wavelet decomposition technique to analyze the received acoustic emission signal, using Hurst analysis to select the acoustic emission signal which Hurst value is lower than 0.5, (4), when the energy consumption ratio Ri is quickly reduced and gradually stabilized, setting the relative stirring speed as critical stirring speed. The inventive vibration receiver is non-inserting type, with simple and easy mounting, without affecting the motion or internal reaction of multi-phase fluid and without demanding emission resource. The vibration signal is generated in fluid motion, which is safe and environment friend with low demand on measurement conditions and the application in bad weather, therefore, the invention can normally work under high-temperature high-pressure condition, with sensitive reaction, low measurement error and wide application.

Description

technical field [0001] The invention relates to detection of a stirred tank, in particular to a detection method of operating parameters of a stirred tank. Background technique [0002] Stirring tank is a widely used mixing equipment, which has been widely used in chemical industry, medicine, papermaking, food, feed and wastewater treatment, especially in chemical engineering. [0003] As an important operating parameter in a stirred reactor, the stirring speed is a core point in the design of the stirring process after the selection of the stirring impeller and the geometric parameters are basically determined, and it is an important parameter to examine the mixing effect of the stirring. The stirring speed must be higher than a critical value to make the slurry meet the required mixing requirements, and this speed is defined as the critical stirring speed. When the stirring speed is low, solid particles are deposited at the bottom of the stirred tank and remain in contact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/02
Inventor 王靖岱阳永荣张晓欢曹翌佳任聪静姜晓静廖祖维
Owner CHINA PETROLEUM & CHEM CORP
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