Monitoring background

Black carbon aerosol is an important component of atmospheric aerosol, mainly amorphous carbon produced by incomplete combustion of carbon-containing substances such as fossil fuels and biomass. Black carbon (BC) is defined as the part of carbonaceous aerosol that absorbs natural light in a wide range of the visible spectrum. It is a black carbonaceous particle suspended in the atmosphere with a particle size of about 0.01μm~1μm. By further tracing the source through the black carbon measurement results, we can understand its distribution and transmission process in the atmosphere, and provide a scientific basis for the formulation of targeted emission reduction strategies. Black carbon can not only change the radiation balance of the earth-atmosphere system through direct climate effects, but also condense into ice nuclei as clouds to change the microphysical properties of clouds, indirectly affecting regional or global climate. Black carbon aerosols in the atmosphere are receiving more and more attention, and long-term continuous monitoring of black carbon aerosols is very necessary.

Product Introduction

Figure 丨 Black carbon online analyzer

The LFBC-2020 black carbon online analyzer developed by Lihe Technology uses the strong absorption characteristics of black carbon aerosol in the visible to infrared band range to continuously and real-time monitor the mass concentration of black carbon aerosol using the light attenuation method. The analyzer illuminates the filter membrane with seven different wavelengths of light in turn, and further calculates the concentration value of black carbon aerosol collected during the measurement period from the light attenuation.

Product Advantages

Better method: Optical analysis method is used to measure based on the principle of light attenuation. Compared with photothermal analysis and photoelectric detection, it is simpler, low-cost and easy to promote on a large scale.

Independent research and development: All major components are independently developed, and the core detection technology is mastered. The light source is adjustable and can monitor the black carbon concentration in seven bands in real time (the bands can be expanded), achieving the output in seconds. The self-developed differential pressure flow controller adopts a patented algorithm, and the flow is accurate and stable.

Dual-channel sampling: Utilize the difference sampling of the two-channel flow rate, combined with the compensation algorithm, to effectively eliminate the influence of the filter membrane load on the monitoring results.

Cost reduction and efficiency improvement: Paper feeding is dynamically judged by time and light intensity attenuation, which results in long paper feeding time and less paper tape consumption, effectively reducing the cost of use.

Application Cases

Figure 丨 Application of black carbon online analyzer

Typical applications of black carbon aerosol monitoring instruments in transportation stations: Hubei Xiaogan Transportation Station, Anhui Wuhu Transportation Station, Hunan Changsha Transportation Station, Shandong Dongying Transportation Station, etc.