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Atmospheric aerosol smoke system for measuring nucleating ability of open burning particulate matters

A technology for atmospheric aerosol and particulate matter, which is applied in chemical analysis, measurement device, particle suspension analysis, etc. using combustion, which can solve the problem of inability to measure the nucleation ability of particulate matter, and avoid insufficient combustion, smoldering, and burning time. long-lasting effect

Pending Publication Date: 2019-04-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to simulate the reaction and transmission process of air pollutants produced in the open-air combustion of biomass, it is necessary to provide an environment with low temperature, low pressure, and continuous strong light radiation. However, due to the material and structure of the existing atmospheric aerosol smoke boxes (mostly FEP -Teflon film) limitations cannot be realized, in addition, existing atmospheric aerosol smog chambers cannot measure particle nucleation ability

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  • Atmospheric aerosol smoke system for measuring nucleating ability of open burning particulate matters
  • Atmospheric aerosol smoke system for measuring nucleating ability of open burning particulate matters
  • Atmospheric aerosol smoke system for measuring nucleating ability of open burning particulate matters

Examples

Experimental program
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Effect test

Embodiment 1

[0053] An atmospheric aerosol smog system for measuring the nucleation ability of open burning particulate matter, structured as figure 1 As shown in the figure, it includes a combustion device that simulates open-air burning of biomass, an aerosol smoke box that simulates the emission of atmospheric pollutants into the atmosphere, and a CCN-100 cloud condensation nuclear instrument37;

[0054] The combustion device includes a combustion furnace shell 16 with one end open and the other sealed. The combustion furnace shell is a cylindrical shell, the height of the combustion furnace shell is 1000mm, and the inner diameter is 750mm. Cover 7, a sealing ring 8 is provided between the open end of the combustion furnace shell and the furnace cover, the open end of the combustion furnace shell and the furnace cover are fixedly connected by a sealing clip 1, the furnace cover is in the shape of an inverted funnel, and the top funnel of the inverted funnel shape is The nozzle is connec...

Embodiment 2

[0062] The application method of the atmospheric aerosol smog system described in embodiment 1, comprises the steps as follows:

[0063] 1) Weigh 5-15g of clean biomass, put it on the combustion net of the combustion device after drying and spread it out, turn on the supplemental gas pump, input particulate-free air to the furnace shell through the supplemental gas transmission pipe, and open the flue gas analysis instrument, observe the spectrum and record CO, CO 2 The initial concentration of the biomass is ignited, and CO and CO are given in real time through the flue gas analyzer during the biomass combustion process. 2 The concentration value of biomass is calculated and the combustion efficiency is calculated, and the flow rate of the supplemental gas is adjusted by the supplemental gas pump to ensure that the combustion efficiency of the biomass is greater than or equal to 0.9;

[0064]2) Vacuum the box of the aerosol smoke box through the vacuum pump, so that the pres...

experiment example

[0071] Experimental Example: Nucleation Ability Test

[0072] The ability of particles to form cloud condensation nuclei: the ratio of cloud condensation nuclei CCN and total particle concentration measured under different supersaturation (Supersaturation, ss), namely CCN / CN, becomes the nucleation index or activation index. where SS is the difference between relative humidity and 100%.

[0073] ss=RH%-100%

[0074] The Cloud Condensation Nucleus Counter (CCNC) can provide a gradient of supersaturation. Since the supersaturation in the atmosphere is often less than 2%, three supersaturations (0.2%, 0.6% and 1%) were selected in this experiment. to characterize the ability of particles to form cloud condensation nuclei.

[0075] Using the device of Example 1, with reference to the method of Example 2, simulated open-air combustion and emission of rice, wheat, corn, soybean, cotton stalks and Sycamore leaves were carried out, and the nucleation potential of the aerosol particl...

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Abstract

The invention relates to an atmospheric aerosol smoke system for measuring the nucleating ability of open burning particulate matters. The atmospheric aerosol smoke system comprises a burning device for simulating biomass open burning, an aerosol smoke box for simulating the discharge of atmospheric pollutants into the atmosphere, and a cloud condensation nucleus instrument, which are connected with each other in sequence; the system provided by the invention simultaneously has three functions to accurately and really simulate the process of discharging the atmospheric pollutants by biomass open burning; the atmospheric aerosol smoke system is artificially controllable and can repeatedly simulate the physical and chemical reactions of the atmospheric pollutants by the open burning of cropstraws at various heights of the troposphere to the stratosphere, and meanwhile the influence of complex meteorological and topographical factors in the actual environment are eliminated; and throughthis system, the cloud condensation nucleus ability of the particulate matters discharged by the biomass burning can be accurately and really reflected, it is discovered through tests that with the change of time, the cloud condensation nucleus ability of aerosol particulate matters generated by burning is gradually improved, and a guidance is provided for the further research on the particulate matters.

Description

technical field [0001] The invention relates to an atmospheric aerosol smog system for measuring the nucleation ability of open burning particulate matter. Background technique [0002] As a major agricultural country in the world, China ranks first in the world in the amount of crop straw. According to statistics, more than 20% of the crop straw is directly burned in the open air. Atmospheric aerosols produced by the open burning of crop straws play an important role in the deterioration of environmental quality (such as the formation of haze) and visibility reduction, and participate in atmospheric transport and chemical processes. It can effectively act as a cloud condensation nucleus to directly or indirectly affect the climate and gas-liquid cycle; in addition, the atmospheric aerosols produced by the open burning of crop straws have significant inhalation toxicity, which is also harmful to human health. a potential threat. [0003] However, in the actual atmospheric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00G01N15/02G01N15/06G01N31/12
CPCG01N15/00G01N15/02G01N15/0618G01N31/12G01N2015/025
Inventor 陈建民孙剑峰朱超李庆李凌
Owner FUDAN UNIV
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