A kind of black carbon aerosol generator

Abstract

The invention belongs to the field of environmental monitoring, in particular to a black carbon aerosol generator, comprising a gas supply system, a combustion system, a dilution system, a catalytic oxidation device and a fixing frame; the gas supply system includes a first Air supply pipe and a second air supply pipe for supplying combustion-supporting gas; the combustion system includes an air intake device, a combustion chamber, a combustion head and an ignition hole; the dilution system includes a third air supply pipe for supplying dilution gas, a dilution chamber , a sampling port and a heat preservation device; the catalytic oxidation device includes a catalytic oxidizer and a heating device, the sampling port is connected to the inlet end of the catalytic oxidizer through a pipeline, and an exhaust port is arranged on the pipeline; a gas supply system, a combustion system and a dilution system It is fixedly installed on the fixed frame, so that the generator is in a vertical and stable state. The generator can produce stable and pure black carbon aerosols with different particle sizes and concentration ranges, and can generate a large flow rate to meet the subsequent simultaneous measurement of multiple instruments.

Description

technical field [0001] The invention belongs to the field of environmental monitoring, in particular to a black carbon aerosol generator, in particular to a black carbon aerosol generator based on an inverted co-flow diffusion flame combustion, which has the function of generating black carbon aerosols of different sizes and concentrations . Background technique [0002] Black carbon is an important component of atmospheric aerosols, which has an important impact on human health, local visibility reduction, regional haze and global climate change. Among them, the climate effect of black carbon aerosols has received special attention internationally in recent years. Make it one of the global research hotspots. [0003] Gas burners are often used to generate black carbon aerosols for aerosol research for different purposes, such as black carbon aerosol morphology research, aerosol optical performance research, instrument calibration, etc. At present, gas burners can be divid...

AI Technical Summary

Problems solved by technology

The flame produced by the premix burner is unstable, resulting in an unstable black carbon aerosol

The flame produced by the inverted burner is relatively stable, but in the case of poor flow control or unreasonable structural design, the flame is also unstable

[0004] Because the gas burner produces black carbon aerosol, it will also produce a large amount of organic aerosol attached to the surface of black carbon aerosol, which will seriously affect the measurement of black carbon aerosol particle size, optical properties, etc., and will also produce carbon monoxide, nitrogen, etc. Oxides, volatile organic compounds, etc., affect the generation of secondary organic aerosols

Although the black carbon aerosol produced by the gas burner can remove the organic matter attached to its surface after passing through the heat diffuser, it cannot be completely removed, even at a higher temperature, and the temperature is too high will cause carbonization and black carbon gas Sol oxidation

In addition, heat diffusers are generally used to process aerosol samples with small gas flow rates (generally less than 1L min-1), which cannot meet the requirements of subsequent simultaneous measurement of larger gas flow rates by multiple instruments

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