Sound wave monitoring device and method for fluidized bed reactor

A fluidized bed reactor and sound wave technology, applied in chemical instruments and methods, measuring devices, material analysis using sound waves/ultrasonic waves/infrasonic waves, etc., can solve reactor safety hazards, affect fluidized bed flow field, improve, etc. problem, to achieve the effect of preventing reunion failure

Active Publication Date: 2004-11-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the pressure signal has time insensitivity, that is, when the pressure signal changes significantly, the fluidization quality of the bed cannot be improved by changing the operating conditions; while the optical fiber measurement has spatial insensitivity, because the bulk Aggregates walk randomly in the bed, and the measurement cannot be carried out in the whole space of the fluidized bed, so it is impossible to monitor the fluidization quality well
[0006] 2) Both the pressure signal and the optical fiber signal monitoring are plug-in, and holes must be drilled on the wall of the fluidized bed during installation. certain influence
[0007] 3) The environmental requirements are relatively high. For relatively harsh factory environments, such as high temperature, high pressure, dust and other environments, signal distortion may be caused, and the dynamic information inside the fluidized bed cannot be truly reflected.
[0009] 5) X-rays will not only cause potential safety hazards inside the reactor, but also cause harm to the human body, which is not a green and environmentally friendly method
[0010] 6) More importantly, the current various signal analysis methods have not yet been able to obtain the particle size distribution through signal decomposition

Method used

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  • Sound wave monitoring device and method for fluidized bed reactor
  • Sound wave monitoring device and method for fluidized bed reactor
  • Sound wave monitoring device and method for fluidized bed reactor

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Embodiment 1

[0052] A fluidized bed reactor is used to react silica gel and quicklime inside the reactor, and the reaction is fully achieved by feeding gas. By using the device and method of this patent, the frequency range of the sound wave emitted by the internal reaction is measured in the range of 50-100kHz, and the degree of the reaction is judged by the energy fraction in this frequency range. Such as Figure 4 , which is the change curve of the energy fraction in the 50-100kHz frequency area with the growth of time.

Embodiment 2

[0054] The production conditions measured in the production of Qilu Linear Low Density Polyethylene Plant are as follows:

[0055] Superficial gas velocity: 0.6m / s

[0056] Pressure: 2.1MPa

[0057] Temperature: 91°C

[0058] Density: 0.3g / cm 3

[0059] Fluidized bed diameter: 3505mm

[0060] Static bed height: 11.5m

[0061] Melt index: 1.98g / (10min)

[0062] Particle size distribution: 10 mesh: 10.73%

[0063] 18 mesh: 42.63%

[0064] 35 mesh: 31.00%

[0065] 60 mesh: 10.73%

[0066] 120 mesh: 4.93%

[0067] Use the device and method of the present invention to filter the external environment noise in the signal collected in the factory, as shown in Figure 5(a), and Figure 5(b) is the energy fraction diagram after wavelet packet analysis, using neural network analysis and decoupling analysis The obtained particle size distribution is as follows:

[0068]

Embodiment 3

[0070] The device and method of this patent are used in a laboratory-scale fluidized bed, and the experimental parameters are as follows:

[0071] Superficial gas velocity: 0.6m / s

[0072] Pressure: 0.1MPa

[0073] Temperature: 25°C

[0074] Density: 0.3g / cm 3

[0075] Fluidized bed diameter: 300mm

[0076] Static bed height: 0.35m

[0077] Melt index: 1.98g / (10min)

[0078] Polyethylene particle size distribution: 10 mesh: 10.73%

[0079] 18 mesh: 42.63%

[0080] 35 mesh: 31.00%

[0081] 60 mesh: 10.73%

[0082] 120 mesh: 4.93%

[0083] Joining agglomerate diameter: 20mm

[0084] Added agglomeration mass percentage: 1%

[0085] Using the analysis method of the present invention, there is an obvious peak at 3.91k-15.63kHz, and the size of the agglomerate is 21.2mm, and the percentage is 0.89%.

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Abstract

The invention discloses a fluid bed reactor sound-wave monitoring device and method, where the device includes receiving device, amplifying device, signal collecting device and signal processing device; the method includes the following steps: a, receiving sound signal transmitted in the fluid bed reactor; b, analyzing the sound signal, to select the parameters like frequency f, amplitude A, energy E, energy partition Pi in each frequency segment, etc; the practice proves that it has characters of sensitivity, safety and environmental protection, facility and shortcut, etc, can in time and accurately make on-line analysis on the information in the fluid bed (fluid situation, reaction situation, particle size distribution, flow pattern distribution, etc) during the producing practice, and can control production parameters by analyzing result.

Description

Technical field: [0001] The invention relates to the acoustic monitoring of fluidized bed reactors, in particular to the acoustic monitoring of fluidized bed polymerization reactors and fluidized bed granulators. Background technique: [0002] In various industrial processes (chemical, biochemical, food, etc.), fluidized bed reactors are being widely used. However, since most fluidized bed reactors cannot directly observe the internal reaction and flow conditions, they cannot adjust and control the abnormal conditions generated inside in time, resulting in huge losses. Therefore, an online monitoring device and method becomes inevitable. These online monitoring devices should have the characteristics of all-weather, low consumption, precision, and non-invasiveness, among which real-time and online functions are the key. [0003] At present, pressure fluctuation, optical fiber signal and X-ray are widely used in the factory to monitor the fluidized bed reactor online. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/24G01N29/00
Inventor 阳永荣侯琳熙杨宝柱刘成午胡晓萍王靖岱陈纪忠
Owner CHINA PETROLEUM & CHEM CORP
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