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System for measuring carbonaceous concentration in atmospheric particulates

A technology for atmospheric particles and air pollutants, which is applied in measuring devices, particle suspension analysis, air quality improvement, etc., can solve problems such as the inability to measure the carbon concentration of particles, and achieve the purpose of avoiding insufficient combustion, avoiding smoldering, and long burning time Effect

Inactive 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 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, in addition, existing atmospheric aerosol smog chambers cannot measure carbonaceous concentration in particulate matter

Method used

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  • System for measuring carbonaceous concentration in atmospheric particulates
  • System for measuring carbonaceous concentration in atmospheric particulates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The system for measuring the concentration of carbonaceous particles in the atmosphere includes sequentially connected combustion devices for simulating open-air combustion of biomass, aerosol smog boxes for simulating the emission of atmospheric pollutants into the atmosphere, and carbon concentration measuring devices;

[0047] The combustion device for simulating biomass open-air combustion includes 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. A furnace cover 7 is provided at the place, and 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 clip 1, and the furnace cover is in the shape of an inverted funnel. The inverted funnel-shaped top funnel mouth is connected to the gas tra...

Embodiment 2

[0054] The application method of embodiment 1, the steps are as follows:

[0055] 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 air supply pump, input the air without particles into the furnace shell through the air supply transmission pipe, and turn on the flue gas analysis instrument, 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;

[0056] 2) Vacuumize the aerosol smog box through the vacuum pump, so that the pressure inside the aerosol smog box reaches 8-12Pa, turn off the vacuum pump, open the check valve on the air pollutant input...

experiment example

[0064] Experimental Example: Combustion aerosol PM2.5 chemical composition mass ratio composition measured by the system of Example 1

[0065] Using the device of Example 1, referring to the method of Example 2, the rice, wheat, corn, soybean, cotton stalks and fallen leaves were respectively simulated open-air burning and discharge, the air supply flow rate was 9L / min, and the simulated air pollutants were discharged into the atmosphere The aerosol smog box and carbon analyzer in the test were used to measure the carbonaceous components of the aerosols of five kinds of biomass straw and fallen leaves, as shown in Table 1.

[0066] Table 1 Composition of chemical components and mass ratios of PM2.5 in five kinds of biomass straw and fallen leaves combustion aerosols

[0067]

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Abstract

The invention relates to a system for measuring the carbonaceous concentration in atmospheric particulates. The system comprises a burning device for simulating open burning of biomass, an aerosol smoke box for stimulating a process of discharging atmospheric pollutants into the atmosphere, and a carbon concentration measuring device, wherein a gas transmission pipe on a furnace cover of the burning device communicates with an atmospheric pollutant input pipe of the aerosol smoke box; and a gas testing hole of the aerosol smoke box communicates with the carbon concentration measuring device through a conductive rubber pipe. The system for measuring the carbonaceous concentration in the atmospheric particulates has three functions at the same time, and simulates the process of discharging the atmospheric pollutants in the open burning of the biomass accurately and really; the physical and chemical reactions of the atmospheric pollutants generated in open burning of crop straws at all heights of the troposphere and even the stratosphere can be simulated in an artificially controllable and repeatable manner, and meanwhile, the influence of complex weather, terrains and other factors in the actual environment is eliminated; and the carbonaceous concentration in the particulates generated in the burning of the biomass in a simulated environment is accurately tested.

Description

technical field [0001] The invention relates to a system for measuring carbonaceous concentration in atmospheric particles. 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 health of the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00G01N15/06G01N31/12G01N33/00
CPCG01N15/00G01N15/0618G01N31/12G01N33/00Y02A50/20
Inventor 陈建民孙剑峰朱超李庆李凌
Owner FUDAN UNIV
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