Optical method and device for measuring concentration of granules in certain velocity of flow

A particle concentration and measurement method technology, which is applied in the field of scintillation measurement methods and devices for particle concentration of optical flow velocity, can solve the problems of high light source requirements, low measurement accuracy, and difficult maintenance, and achieve high measurement accuracy, simplified instrument structure, The effect of low maintenance cost

Inactive Publication Date: 2007-05-09
刘文清 +8
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Problems solved by technology

[0003] Foreign countries have done long-term research on methods such as measuring particle concentration by opacity. These methods have high requirements for light sources and are technically complicated, so they are costly and difficult to maintain.
Field tests show that the measurement accuracy of these methods is not high

Method used

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  • Optical method and device for measuring concentration of granules in certain velocity of flow
  • Optical method and device for measuring concentration of granules in certain velocity of flow
  • Optical method and device for measuring concentration of granules in certain velocity of flow

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Embodiment Construction

[0031] Refer to Fig. 1 for the method and device of the present invention. and used for the following measurements.

[0032] 1. Velocity measurement

[0033] The measuring device of the invention was first tested in a wind tunnel. The wind tunnel calibration error is 0.1+V×1% (m / s), and its accuracy meets the requirements.

[0034] Figure 2 shows the wind tunnel measurement results of the device of the present invention. The difference between the measured values ​​of the current meter and pitot tube is smaller than the wind tunnel calibration error.

[0035] Fig. 3 has provided the velocity measurement result of device of the present invention in Tongling power plant flue when boiler and blower are not working, and the time has gone through 24 hours, because the blower stopped working, the refractive index turbulent flow was very weak. Only 10 seconds of data was used to calculate the correlation, and the maximum correlation of some data is less than 0.02, which...

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Abstract

A device used for measuring concentration of optical velocity particle consists of LED and modulation circuit. It is featured as setting photoelectric diode detector in front of LED, amplifying signals by said detector then sending them to two low frequency band-pass filters, sending signals outputted by filters to computer through A/D conversion, calculating cross-correlation of two signals and their flow velocity by computer then calculating concentration of particle after signal is passed through two filters and is converted by A/D conversion.

Description

technical field [0001] The invention belongs to an optical measurement method and an instrument, in particular to a method and a device for scintillation measurement of an optical velocity particle concentration. Background technique [0002] Particulate matter is one of the most important pollutants in the atmosphere. The flue gas emitted by coal-fired power plants, cement plants, metal smelters, etc. is the main source of particulate matter and polluting gases in the atmosphere, and it will be like this for a long period of time in the future. To control and control pollution, it is necessary to carry out online continuous monitoring of the pollutant discharge of these enterprises. [0003] Foreign countries have done long-term research on methods such as measuring particle concentration by opacity. These methods have high requirements on light sources and are technically complicated, so they are costly and difficult to maintain. Field tests show that the measurement accu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06G01N21/00
Inventor 刘文清张玉钧陆亦怀刘建国曾宗泳刘和来江宇詹锴方武
Owner 刘文清
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