Automatic calibration device for dust concentration on-line monitoring

Abstract

The invention discloses an automatic calibration device for dust concentration on-line monitoring, comprising a calibration frame and a calibration unit arranged on the calibration frame in a manner of being capable of transversely moving, wherein the calibration frame is provided with a light emitting port and a light receiving port, the transversely moving positions of the calibration unit comprise a calibration position and a measurement calibration; when the calibration unit is located in the measurement position, a light ray emits to an area to be measured through the light emitting port to generate scattering, and scattered light returns back through the light receiving port for measuring; when the calibration unit is located in the calibration position, the light ray emits onto the calibration unit to generate refraction and returns back for calibration; the device is simple and compact in structure, the calibration unit is mounted on the calibration frame and can realize transverse movement for switching between the calibration position and the measurement position to realize automatic calibration, the manual operations are reduced, and the accuracy and the stability of calibration are ensured; the device can work independently, the factory debugging of the calibration unit is facilitated, and the device has the characteristic of being convenient in on-site maintenance.

Description

technical field [0001] The invention relates to the field of smoke and dust monitoring, in particular to an automatic calibration device for on-line monitoring of dust concentration. Background technique [0002] With the rapid development of the national economy, many fields of industrial production, such as coal-fired power plants, cement, etc., will emit soot into the atmosphere during the production process. Therefore, real-time measurement of soot concentration is an important part of emission source monitoring. According to the national The relevant technical requirements in the environmental protection standard HJ / T76-2007, in order to ensure the accuracy of the instrument, the instrument needs to have a calibration function. [0003] In the prior art, the calibration tool is used as an accessory of the dust concentration monitor. Either the calibration tool is inserted when calibration is required and taken out when it is in working condition, or the calibration tool...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the calibration tool is used as an accessory of the dust concentration monitor. Either the calibration tool is inserted when calibration is required and taken out when it is in working condition, or the calibration tool is integrated on the dust concentration monitor, and the calibration tool is manually inserted into the dust concentration monitor. Rotate 180° to complete the calibration of zero point and span; but the structure of both is relatively complicated, requiring regular manual calibration, which is not convenient for on-site maintenance

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