Method for detecting micro-charge type online dust and detector pollution
A detection method, a charge-type technology, applied to the model of the digital signal processing part, the acquisition of raw data, the principle and the realization of the circuit field, can solve the problems of difficult debugging, difficult maintenance, poor reliability, etc., to reduce production costs and improve measurement. Accuracy and improved response
Active Publication Date: 2009-02-11
杭州科灵威识精密仪器有限公司
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Problems solved by technology
However, the biggest defect of this instrument is: there is a non-linear relationship between light absorption and dust concentration; it is difficult to debug and maintain; it has poor reliability in operation under harsh industrial conditions; especially at low concentrations, the sensitivity and accuracy of the instrument are very low. unsatisfactory results
The existing more practical method is to manually check the instrument regularly or when the signal is abnormal; there are also methods for automatic measurement of the instrument, but because two or more electrodes are required, the existing automatic method makes the mechanical The structure and circuit are complicated and not practical
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[0027] The present invention and its principles are described in detail below in conjunction with specific embodiments.
[0028] A grounded conductor, the probe, exposed to a dust-entrained airstream will sense a small current caused by the motion of the dust particles. By measuring, analyzing and processing this weak current signal, the information of dust concentration and flow can be obtained.
[0029] The weak current mentioned above is caused by two physical processes: one is the charge transfer (Triboelectrification) phenomenon generated by moving particles hitting the probe, and the current generated by this reason is called transfer current; the other is the movement The electrostatic induction (Electrostatic Induction) phenomenon generated by the charge of the particle itself when the particles pass near the probe, the current generated by this reason is called the induced current; the sum of the current generated by the two physical processes is called the total curr...
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The present invention relates to a method and a device for measuring the flux and the thickness of the powder in the air flow and a probe head pollution detecting method and a circuit. The aim of the present invention is to take good advantages of all the information included in the original signals by using digital signal processing technology and to make a higher measuring precision and a wider application range. Firstly, the transferring current, the induced current, the total current, the calculating variance and the typical value are obtained by sampling and computing. The influence of the current, the induced current and the onflow are transferred by using different calculating method to perform modification in consideration of the circumstance, and finally the modified powder flow data is obtained. The present invention also discloses two optimized actualizing devices and a method and a circuit for detecting that if the probe head has the source battery effect and the bridge forming effect. The method and the device disclosed in the present invention can improve the measuring precision, wide the application range, make it possible to run steadily in a long time and lowering the production cost of the device.
Description
technical field [0001] The invention relates to a method for measuring the flow and concentration of dust in the airflow and a method for detecting the pollution of a dust detection probe, in particular to the collection of original data, the model, principle and realization circuit of the digital signal processing part. Background technique [0002] In the air flow entraining dust (gas-solid two-phase flow), the measurement technology of dust (solid) concentration is widely used in the industrial field. Such as: production and supply of electricity and heat; non-metallic mineral (especially cement) product industry; ferrous metal smelting and processing industry; non-ferrous metal smelting and processing industry; chemical product industry; petrochemical industry; and papermaking, textile, agricultural and sideline products Processing and other industries. Control the production process of these industries and detect pollution sources (primary discharge), especially after ...
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IPC IPC(8): G01F1/64G01N15/00G01N27/00G06F19/00G06F17/10
Inventor 杜豫生
Owner 杭州科灵威识精密仪器有限公司