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Method and device for detecting mass flow rate of pulverized coals in process of conveying pulverized coals

A technology for pulverized coal quality and pulverized coal transportation, which is applied in mass flow measurement devices, indirect mass flow meters, etc., can solve problems such as large errors in pulverized coal measurement methods, and achieve the goals of improving measurement accuracy, performance, and spatial resolution Effect

Active Publication Date: 2013-01-02
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method and device for detecting the mass flow rate of pulverized coal in the process of pulverized coal transportation, which is detected by non-invasively picking up the sound waves generated by the friction and collision of fluid particles in the pipeline The flow rate of the medium in the pipeline is used to solve the problem of large errors in the pulverized coal measurement method and improve the measurement accuracy

Method used

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  • Method and device for detecting mass flow rate of pulverized coals in process of conveying pulverized coals
  • Method and device for detecting mass flow rate of pulverized coals in process of conveying pulverized coals
  • Method and device for detecting mass flow rate of pulverized coals in process of conveying pulverized coals

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Embodiment 1

[0040] Such as figure 1 As shown, the detection device of this embodiment includes a pulverized coal conveying pipeline 1, two sets of acoustic wave sensor groups 2, a temperature sensor 3, a pressure sensor 4, a signal amplification device 5, a signal acquisition device 6, a signal processing device 7, an output display The device 8 and the control device 9; the acoustic wave sensor group 2 is respectively arranged on the outer wall of the pipeline 1, the temperature sensor 3 and the pressure sensor 4 are respectively inserted into the pipeline 1, and the acoustic wave sensor group 2 is connected with the signal amplification device 5 to convert the acoustic wave signal into an electrical signal for transmission To the signal amplifying device 5, the signal amplifying device 5 is connected to the signal collecting device 6, and the amplified signal is transmitted to the signal collecting device 6, and the pressure sensor 4 is connected to the signal collecting device 6, and th...

Embodiment 2

[0069] Present embodiment is as follows to the detection process of pulverized coal moisture content:

[0070] The present invention is used to measure the moisture content of pulverized coal in the pipeline 1 . The acoustic wave sensor selected in this embodiment is an acceleration sensor. The moisture content of pulverized coal was measured off-line on a hygrometer after sampling. The moisture content of pulverized coal varies from 0.5wt% to 2.5wt%. The frequency response range of the acceleration sensor is 1 ~ 30kHz, the system sampling frequency is 100KHz, and the sampling time is 10s. Other experimental devices are the same as in Example 1.

[0071] The sound wave signal is preprocessed by smoothing and orthogonal signal correction, and the preprocessed sound wave signal is analyzed by Fourier transform. The main frequency of the sound wave signal when the moisture content is 0 is used as the reference value, and the first group of sound waves is taken. The average fr...

Embodiment 3

[0074] Present embodiment is as follows to the detection process of pulverized coal particle size:

[0075] The invention is used to measure the coal powder particle size in the pipeline 1 . The particle size of pulverized coal is obtained by sampling and analyzing offline on a laser particle size analyzer. The particle size of pulverized coal varies from 20 microns to 50 microns. The frequency response range of the acoustic emission sensor is 20-300KHz, the system sampling frequency is 700KHz, and the sampling time is 20s. Other experimental equipment is identical with embodiment 1,

[0076] The acoustic signal was preprocessed with multivariate scatter correction. Using wavelet analysis to analyze the preprocessed acoustic signal, the steps include:

[0077] 1) Use the orthogonal wavelet as the wavelet mother function to decompose the signal by wavelet;

[0078] 2) Use the wavelet decomposition coefficient to represent the signal energy, calculate the total energy of th...

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Abstract

The invention discloses a method and device for detecting mass flow rate of pulverized coals in a process of conveying the pulverized coals. Sound waves generated by frictions and collision of fluid particles in a non-invasive pick-up pipe with a pipe wall are used to detect medium flow rate in the pipe, thereby solving the problem of large errors in a metering method of the pulverized coals, and improving the measuring accuracy. Sound wave detection is a non-invasive detection method, and a detection device is simple, safe, environmental-friendly, and is suitable for online detection in an industrial production process. A sound wave sensor array is used, and influences of unstable conveyance of the pulverized coals on the measuring accuracy can be effectively eliminated by fusing data of a plurality of sensors. Compared with the prior art, flow velocity, humidity ratio, particle size and mass flow-rate detection technologies based on the sound wave detection are more sensitive, and higher in the detection accuracy, and can be used for replacing a radioactive density meter harmful to a human body.

Description

technical field [0001] The invention relates to a detection device and method for pulverized coal parameters in the process of dense-phase pneumatic conveying of pulverized coal, in particular to a method and device for detecting the mass flow rate of pulverized coal in the pulverized coal conveying process. Background technique [0002] High-pressure pulverized coal dense-phase pneumatic conveying is one of the key technologies for large-scale coal gasification. At present, there are two main types of coal supply systems for pressurized dense-phase pneumatic conveying of dry coal powder. One is to use the bottom discharge type coal feeding tank and dense phase pipeline transportation, and the other is to use the top discharge type to feed coal. GSP (German Future Energy) method of tank and dense phase pipeline transportation. In the first system, each coal supply tank supplies coal to the two coal burners of the gasifier at the same time, and the coal supply volume and sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/86
Inventor 黄正梁盛新王靖岱章友祥赵锦波汪永庆何乐路余世金阳永荣黄成浩
Owner CHINA PETROLEUM & CHEM CORP
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