Orthogonal light path-based equipment for online monitoring concentration of organic carbon/elemental carbon in PM (Particulate Matter) 2.5

Abstract

The invention discloses orthogonal light path-based equipment for online monitoring the concentration of organic carbon / elemental carbon in PM (Particulate Matter) 2.5. The orthogonal light path-based equipment comprises an on-line sampling unit, a sample processing and detecting unit and an orthogonal light path system, and is characterized in that the sampling unit comprises a vacuum pump, a mass flow controller, a quartz filtering membrane, a ball valve, a volatilizable organic matter denuder, and a PM2.5 cutting head; the sample processing and detecting unit comprises a digestion furnace, an oxidation furnace, a gas path control network, a carrier gas source and a non-deviation infrared detector; the orthogonal light path system comprises a laser, a light beam splitter, a reference light path photoelectric detection unit, a quartz filtering membrane transmission light path photoelectric detection unit and a reflection light path photoelectric detection unit; and three gases of high-purity He, 5 percent O2 / He and 5 percent CH4 / He are required to be controlled by a gas path valve network by a singlechip. The orthogonal light path-based equipment is capable of simultaneously detecting light intensity values of incident laser, sampled reflected light and transmitted light of the quartz filtering membrane, and relatively accurately achieving the segmentation of the organic carbon and the elemental carbon.

Description

technical field [0001] The invention relates to an environmental detection instrument and equipment, in particular to an equipment for online monitoring of organic carbon / elemental carbon concentration in PM2.5. Background technique [0002] Organic carbon and elemental carbon are one of the main components of PM2.5. Because they disrupt the earth's radiation balance, affect the global climate, reduce urban visibility, and endanger human health, they are key research contents in the field of atmospheric aerosols. [0003] Elemental carbon can absorb light from ultraviolet to infrared. More and more reports also believe that elemental carbon will have a significant effect on global warming and affect the global climate; PM2.5 in the atmosphere will enter the alveoli with human breathing, and even Enter the human blood circulation system, seriously endangering human health. [0004] In atmospheric aerosols, especially fine particulate matter PM2.5, the mass concentration of c...

AI Technical Summary

Problems solved by technology

Both of these devices use thermo-optic technology. DRI uses "Y" optical fiber to simultaneously measure the transmitted light and reflected light of the sampled quartz filter membrane, which can fully reflect the carbonization information of organic carbon in the sample during heating. Organic carbon / elemental carbon The distinction is more scientific and objective, but it cannot be applied to online monitoring equipment; Sunset’s online monitoring equipment only realizes the detection of the transmitted light of the sampling quartz filter, but cannot measure the reflected light of the sampling quartz filter, which limits its application field

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