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Aerosol system for measuring volatility of biomass open burning particulate matters

A particle and biomass technology, applied in the field of aerosol system, can solve the problem of unable to measure the volatility of particles, and achieve the effect of avoiding insufficient combustion, long burning time and avoiding smoldering

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, the existing atmospheric aerosol smog chamber cannot measure the volatility of particulate matter

Method used

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  • Aerosol system for measuring volatility of biomass open burning particulate matters
  • Aerosol system for measuring volatility of biomass open burning particulate matters
  • Aerosol system for measuring volatility of biomass open burning particulate matters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] An aerosol system for measuring the volatility of biomass open-air combustion particles, including a sequentially connected combustion device for simulating open-air combustion of biomass, an aerosol smog box for simulating the emission of atmospheric pollutants into the atmosphere, and a particle volatility measurement device ;

[0058] The combustion device comprises a combustion furnace shell 16 with one end open and the other end sealed. The combustion furnace shell is a cylindrical shell with a height of 1000 mm and an inner diameter of 750 mm. The cover 7 is provided with a sealing ring 8 between the opening end of the combustion furnace shell and the furnace cover. The opening end of the combustion furnace shell and the furnace cover are fixedly connected by the sealing clip 1. The furnace cover is in the shape of an inverted funnel, and the top funnel of the inverted funnel shape The mouth is connected with the gas transmission pipe 6, and the gas transmission p...

Embodiment 2

[0065] Embodiment 1 is used to measure the application method of the aerosol system of the volatility of biomass open-air combustion particulate matter, comprising the steps as follows:

[0066] 1) Weigh 10.00g of clean biomass, put it on the combustion net of the combustion device after drying and spread it out, turn on the air supply pump, input particle-free air into the furnace shell through the air supply transmission pipe, and turn on the flue gas analyzer , observe the spectrum and record CO, CO 2 The initial concentration of the biomass is ignited, and the CO and CO are given in real time by the flue gas analyzer during the biomass combustion process. 2 concentration value and calculate the combustion efficiency, and adjust the air supply flow rate through the air supply pump to ensure that the combustion efficiency of biomass is greater than or equal to 0.9;

[0067] 2) Vacuumize the aerosol smog box through the vacuum pump, so that the pressure inside the aerosol sm...

experiment example

[0074] Experimental example: particle volatility test

[0075] Volatility affects the gas-solid distribution of aerosols and the generation of secondary aerosols, which in turn determines the atmospheric transport and cycle life of aerosol particles. Volatility is also an important indicator of aerosol thermal stability. The volatility of aerosol is usually expressed by VFR (volume fraction remaining), mass residual or thermogravimetric percentage MFR (massfraction remaining) after volatilization is stable. Utilize the system of the present invention to analyze the thermal stability of 100-400nm particulate matter produced by 5 kinds of straw combustion at 25-250°C and the density change before and after volatilization of the particulate matter. The volatility test results of the particulate matter produced by different straws at different temperatures are as follows: Figure 2-Figure 5 shown by Figure 2-Figure 5 As the temperature increased, the VFR decreased significantly,...

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Abstract

The invention relates to an aerosol system for measuring the volatility of biomass open burning particulate matters. The aerosol 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 particulate matter volatility measurement device, 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 aerosol system is artificially controllable and can repeatedly simulate the physical and chemical reactions of the atmospheric pollutants generated by the open burning of crop straws at various heights of thetroposphere to the stratosphere, and meanwhile the influence of complex meteorological and topographical factors in the actual environment are eliminated; and by heating the particulate matters in a simulated atmospheric environment via the particulate matter volatility measurement device to change the particle size, then removing volatile components, and measuring the particle size changes of monodisperse particulate matters before and after heating to judge the volatility of the particulate matters, the volatility of the particulate matters in the actual environment can be reflected truly and accurately.

Description

technical field [0001] The invention relates to an aerosol system for measuring the volatility of biomass open burning particulate matter. Background technique [0002] As a large agricultural country in the world, China ranks first in the world in the possession of crop stalks. According to statistics, more than 20% of the crop stalks are directly burned in the open air. Atmospheric aerosols produced by the open-air burning of crop straws play an important role in the deterioration of environmental quality (such as the formation of smog) and the reduction of visibility, and will participate in atmospheric transport and chemical processes. Their special optical properties and chemical composition affect the surface radiation. It can directly or indirectly affect the climate and gas-liquid circulation as cloud condensation nuclei; in addition, the atmospheric aerosols produced by the open-air burning of crop straws have significant inhalation toxicity, which also affects the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00G01N15/02G01N15/06G01N31/12
CPCG01N15/00G01N15/02G01N15/0618G01N31/12G01N2015/0003
Inventor 陈建民孙剑峰朱超李庆李凌
Owner FUDAN UNIV
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