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Atmospheric aerosol smog system for measuring particle size distribution of particulates in simulation environment

An atmospheric aerosol and simulated environment technology, applied in particle suspension analysis, particle and sedimentation analysis, measuring devices, etc., can solve the problem that there is no special device or system for detecting particle size distribution, particle size changes greatly, and limitations cannot be realized and other problems to achieve the effect of avoiding inability to measure or inaccurate measurement, high temperature and high accuracy

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

AI Technical Summary

Problems solved by technology

In order to simulate the reaction and transmission process of atmospheric 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
[0006] There are many types of particulate matter emitted by the open-air burning of crop straws, including those that are easily soluble in water and those that are insoluble in water. There are many factors that affect particulate matter in the atmospheric environment, such as temperature, humidity, and light intensity. These factors will lead to changes in the particle size of particulate matter. It is very large, and the accuracy of the particle size distribution obtained from the detection is very poor. At present, there is no special device or system for detecting the particle size distribution

Method used

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  • Atmospheric aerosol smog system for measuring particle size distribution of particulates in simulation environment
  • Atmospheric aerosol smog system for measuring particle size distribution of particulates in simulation environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] An atmospheric aerosol smoke system for measuring the particle size distribution of particles in a simulated environment, with a structure such as figure 1 Said, including a combustion device that simulates open-air burning of biomass, an aerosol smoke box that simulates the emission of air pollutants into the atmosphere, and a wide-range particle size spectrometer (WPS-1000XP) 37;

[0049] The combustion device includes a combustion furnace shell 16 that is open at one end and sealed at the other end. The combustion furnace shell is a cylindrical shell. The combustion furnace shell has a height of 1000 mm and an inner diameter of 750 mm. The opening end of the combustion furnace shell is provided with a furnace. Cover 7, a sealing ring 8 is arranged 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 clamp 1. The furnace cover is inverted funnel shap...

Embodiment 2

[0056] The test method of the atmospheric aerosol smoke system for measuring the particle size distribution in a simulated environment described in embodiment 1, includes the following steps:

[0057] 1) Weigh 5-15g of clean biomass, dry it and place it on the combustion net of the combustion device and spread it out. Turn on the supplemental air pump, and input particulate-free air to the furnace shell through the supplemental air transfer tube, and turn on the flue gas analysis Instrument, observe the spectrum and record CO, CO 2 The initial concentration of, ignite the biomass, and give CO and CO in real time through the flue gas analyzer during the biomass combustion process 2 Calculate the combustion efficiency and adjust the flow rate of the supplemental gas through the supplemental air pump to ensure that the biomass combustion efficiency is greater than or equal to 0.9;

[0058] 2) Vacuum the box body of the aerosol smoke box through the vacuum pump to make the pressure in t...

experiment example

[0065] Experimental example: particle size distribution test in a simulated environment

[0066] Using the device of Example 1, refer to the method of Example 2 to simulate open burning and discharge of rice, wheat, corn, soybeans, and cotton stalks. The supplemental air flow was 9L / min, and the number and concentration of particles of different sizes were tested. The result is as figure 2 Shown. From figure 2 It can be seen that the particle size of rice, wheat, corn, soybean, and cotton stalks emitted by open burning is mainly concentrated around 100nm-500nm, which reflects the main situation of particle size distribution, which is caused by air pollutants. The resulting regional environmental effects and climate effects provide favorable data.

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Abstract

The invention relates to an atmospheric aerosol smog system for measuring particle size distribution of particulates in a simulation environment. The atmospheric aerosol smog system comprises a combustion device for simulating open burning of a biomass, an aerosol smog chamber for simulating an atmospheric pollutant to discharge to an atmosphere, and a particulate particle size and concentration measuring instrument, wherein the combustion device, the aerosol smog chamber and the particulate particle size and concentration measuring instrument are connected sequentially. The atmospheric aerosol smog system for measuring the particle size distribution of the particulates in the simulation environment provided by the invention simultaneously has three functions, and simulates the process ofthe open burning of the biomass to discharge the atmospheric pollutant accurately and authentically; the physicochemical reaction of the atmospheric pollutant, generated by open burning of crop straw,at each height of a convection layer or even an advection layer is simulated artificially, controllably and repeatedly; meanwhile, the influences of factors such as complex weather and terrain in anactual environment are eliminated; and the particle size distribution of the particulates in the simulation environment is obtained accurately via a WPS-1000XP wide-range particle spectrometer, and the degree of accuracy is high, so the defect that the particle size distribution of the particulates cannot be measured or is measured inaccurately is prevented.

Description

Technical field [0001] The invention relates to an atmospheric aerosol smoke system for measuring the particle size distribution of particles in a simulated environment. Background technique [0002] As a large agricultural country in the world, China has the largest amount of crop straw in the world. According to statistics, more than 20% of 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 reduced visibility, and will participate in atmospheric transmission and chemical processes. Its special optical properties and chemical composition affect the surface radiation. It can effectively act as cloud condensation nucleus to directly or indirectly affect the climate and the gas-liquid cycle; in addition, the atmospheric aerosols produced by the open-air burning of crop straws have significant inhalation toxicity and ar...

Claims

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Application Information

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