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Piezoelectric sensor-based on-line measurement device and method for particle size distribution

A technology of piezoelectric sensor and particle size distribution, which is applied in the direction of measuring devices, particle size analysis, particle and sedimentation analysis, etc., can solve the problems of easy pollution and installation of the lens, and achieve the effect of small size, easy installation and reduced impact

Inactive Publication Date: 2012-07-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Among the existing online particle size detection technologies, the relatively mature optical imaging method has the disadvantages of easy contamination of the lens and complicated installation.

Method used

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  • Piezoelectric sensor-based on-line measurement device and method for particle size distribution
  • Piezoelectric sensor-based on-line measurement device and method for particle size distribution
  • Piezoelectric sensor-based on-line measurement device and method for particle size distribution

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Embodiment Construction

[0016] The invention provides an on-line measurement device and method for particle size distribution based on a piezoelectric sensor. Below in conjunction with accompanying drawing and embodiment the present invention is described as follows;

[0017] figure 1 Shown is a schematic diagram of the principle structure of the on-line measurement device for particle size distribution. In the figure, a collision sensing probe 3 is inserted in the middle of the gas-solid two-phase flow pipeline 1, and the collision sensing probe 3 is in the middle of the particle flow field 2; the length of the collision sensing probe is one-third to one-third of the diameter of the pipeline two. A piezoelectric sensor 4 is installed at the end of the collision sensing probe 3, and the piezoelectric sensor 4 is made of piezoelectric ceramics or piezoelectric film, so as to achieve the purpose of continuous use for a long time. The signal conditioning board and the data acquisition module 5 are fi...

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Abstract

The invention discloses a piezoelectric sensor-based on-line measurement device and method for particle size distribution, which belong to the field of gas-solid two-phase flow on-line measurement technique. The on-line measurement device is characterized in that: a collision induction probe is inserted in the middle of a gas-solid two-phase flow pipeline; a piezoelectric sensor is arranged on the collision induction probe; a signal conditioning plate and a data acquisition module are connected with the piezoelectric sensor and a signal processing system; when solid particles are collided with the collision induction probe, the piezoelectric sensor senses a particle collision signal and sends the particle collision signal to the signal conditioning plate and the data acquisition module; and the particle size distribution is obtained through signal processing software and a collision particle model. The device has the characteristic that the piezoelectric sensor is utilized to obtain the collision signal of small particle collision directly so as to realize real-time monitoring on the particle size distribution; the influence of background noise on the collision signal is reduced; and a collision dynamics principle is utilized to build a mathematical model of the collision signal and the particle size, so that the size distribution of measured particles in the pipeline is obtained.

Description

technical field [0001] The invention belongs to the technical scope of on-line measurement of gas-solid two-phase flow, and in particular relates to an on-line measurement device and method for particle size distribution based on a piezoelectric sensor. Background technique [0002] Pneumatic conveying is an effective method of using airflow to transport granular solids in pipelines. It is an important technology in the current industrial production process and is widely used in the transportation and drying process of granular materials and powder materials in various industrial sectors. A typical example is the pipeline transportation of solid fuels such as coal powder in thermal power plants. The pulverized coal from the coal mill is carried by compressed air and supplied to multiple conveying pipes, and then enters the burner array to burn in the furnace. The particle size distribution of pulverized coal is closely related to the efficiency of combustion and the emissio...

Claims

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Application Information

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IPC IPC(8): G01N15/02
Inventor 闫勇高凌君
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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