Particulate matter concentration measuring instrument applicable to low-concentration and wet flue gas

Abstract

The invention provides a particulate matter concentration measuring instrument applicable to low-concentration and wet flue gas. The particulate matter concentration measuring instrument is high in measurement accuracy and is used for overcoming the defects in the prior art. In order to solve the technical problem, a technical scheme adopted by the invention is as follows: the particulate matter concentration measuring instrument applicable to the low-concentration and wet flue gas comprises a cabinet, a heating sampling probe, a test chamber, a low-concentration dust meter sensor and a jet pump, wherein the heating sampling probe is arranged in a flue and is connected into the test chamber in the cabinet through a heat traced pipeline, a heating module is arranged on the test chamber, the low-concentration dust meter sensor is arranged on the test chamber and is used for measuring particulate matter concentration of flue gas acquired in the test chamber, and the jet pump is arranged at the internal bottom side of the cabinet and is used for pumping flue gas acquired by the heating sampling probe into the test chamber. The particulate matter concentration measuring instrument can be extensively applied to the field of on-line monitoring on particulate matters.

Description

technical field [0001] The invention is applicable to a particle concentration measuring instrument in low and wet flue gas, and belongs to the technical field of particle online monitoring. Background technique [0002] Conventional laser backscattering soot meter is a commonly used smoke detection instrument. The measurement principle of conventional laser backscattering soot meter is to use infrared laser as the emission light source. When the laser is irradiated on the dust, light scattering occurs. Under the condition of certain optical system and dust properties, the scattered light intensity is proportional to the dust concentration, and then the measurement is completed after calculation. [0003] From the perspective of engineering practice, when the concentration of smoke and dust emission is high (greater than 50mg / m 3 ), is a better choice. But for domestic 30mg / m 3 Below, even 5mg / m 3 The technical requirements for dust emission, as an online dust measuremen...

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Problems solved by technology

[0004] (1) The particle size and concentration of the dust have dropped a lot simultaneously, so the chances of laser reflection and refraction have dropped a lot, and there are phenomena such as failure to measure, no reflected light signal, etc.

[0005] (2) The water content of the flue gas increases, which generally accounts for more than 10%, or even higher. When the laser is irradiated on the micro-water droplets, reflection and refraction will occur, so the interference factors of water are large, resulting in inaccurate measurement

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