Simulation system for measuring heavy metal concentration in atmospheric particulates

A technology of atmospheric particulate matter and simulation system, which is applied in the direction of measuring devices, particle suspension analysis, air quality improvement, etc., can solve the problems of inability to measure the concentration of heavy metals in particulate matter, and achieve the effects of avoiding insufficient combustion, avoiding smoldering, and long burning time

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, in addition, the existing atmospheric aerosol smog chamber cannot measure the concentration of heavy metals in particulate matter

Method used

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  • Simulation system for measuring heavy metal concentration in atmospheric particulates
  • Simulation system for measuring heavy metal concentration in atmospheric particulates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A simulation system for measuring the concentration of heavy metals in atmospheric particulate matter, the structure is as follows figure 1 As shown in the figure, it includes a combustion device that simulates open-air combustion of biomass, an aerosol smog box that simulates the emission of air pollutants into the atmosphere, and an online heavy metal analyzer connected in sequence;

[0048] 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 i...

Embodiment 2

[0056] The application method of the analog system for measuring the concentration of heavy metals in the atmospheric particulate matter of embodiment 1 comprises the steps as follows:

[0057] 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;

[0058] 2) Vacuumize the aerosol smog box through the vacuum pump, so that the pressure insid...

experiment example

[0065] Experimental Example: Combustion Aerosol PM Measured by the System of Example 1 1.0 Chemical composition and heavy metal ratio

[0066] 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 emission, and the air supply flow rate was 9L / min, and the simulated air pollutants were discharged into the atmosphere. The aerosol smog box and heavy metal analyzer in the test were used to measure the chemical composition and heavy metal ratio of five kinds of straw burning aerosol PM10, as shown in Table 1.

[0067] Table 1 Five kinds of straw burning aerosol PM 10 Chemical composition and heavy metal ratio

[0068]

[0069] It can be seen from Table 1 that the particulate matter discharged from open-air burning of rice, wheat, corn, soybean, and cotton stalks all contains arsenic, zinc, nickel, and chromium heavy metals, and the composition content...

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Abstract

The invention relates to a simulation system for measuring heavy metal concentration in atmospheric particulates. The simulation system comprises a burning device for simulating biomass opening burning, an aerosol smog chamber for simulating that the atmospheric pollutants are discharged to the atmosphere, and a heavy metal online analyzer which are connected in order; a gas transmission pipe on afurnace cover of the burning device is communicated with an atmospheric pollutant input pipe of the aerosol smog chamber, and a gas test port of the aerosol smog chamber is connected with the heavy metal analyzer through a conducting rubber pipe. The simulation system disclosed by the invention possesses three functions at the same time, the process of biomass opening burning and atmospheric pollutant emission can be accurately and really simulated; the simulation system is artificially controllable, the physicochemical reaction of the atmospheric pollutants produced by burning the crop strawon various heights of a troposphere even a stratosphere can be repeatedly simulated, and the influences from complex atmosphere, terrain and like in the actual environment can be eliminated; and thesystem can accurately measure and analyze the heavy metal and heavy metal concentration in the atmospheric particulates in the simulation environment.

Description

technical field [0001] The invention relates to a simulation system for measuring the concentration of heavy metals 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 t...

Claims

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Application Information

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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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