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On-line detection method of micro-nano aerosol wet ultraviolet absorption method in production environment

A technology of micro-nano aerosol and ultraviolet absorption method, which is applied in the measurement of color/spectral characteristics, sampling device, etc., can solve the problems of low detection accuracy of aerosol, error of dust measurement results, data lag, etc., and is convenient for physical and chemical analysis and testing. , to achieve automatic control, to achieve the effect of online detection

Inactive Publication Date: 2016-04-27
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TEOM oscillating microbalance measures the aerosol concentration by converting the frequency into an electrical signal according to the relationship between the mass of aerosol particles accumulated on the filter membrane and the oscillation frequency of the microbalance. Its disadvantage is that the device is relatively large and not suitable for carrying Go to the site for testing, and the price is relatively expensive; some measuring instruments based on light scattering use aerosol particles to cause light scattering when passing through the laser irradiation area, and detect the concentration of dust by measuring the intensity of scattered light, and the superposition of scattered light It will cause large errors in the dust measurement results, and the optical system is more complicated
[0004] In the existing online detection method based on the filter membrane weighing method, there are mainly the following problems: high precision requirements for microbalances; detection data are greatly affected by objective factors; detection accuracy for high humidity or volatile aerosols Low
Although this equipment achieves efficient collection of micro-nano dust in the air, it only obtains dust particle samples, and offline detection is still required to obtain the concentration value of dust in the air, and the measured data has a hysteresis

Method used

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  • On-line detection method of micro-nano aerosol wet ultraviolet absorption method in production environment
  • On-line detection method of micro-nano aerosol wet ultraviolet absorption method in production environment
  • On-line detection method of micro-nano aerosol wet ultraviolet absorption method in production environment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Real-time monitoring of nano-titanium dioxide powder production workshop.

[0069] Prepare 0mol / L, 1mol / L, 2mol / L, 3mol / L, 4mol / L and 5mol / L nano-titanium dioxide standard solutions in the laboratory, and use the ultraviolet spectrophotometer 2 to measure the absorbance values ​​of the standard solutions respectively These are 0, 0.378, 0.739, 1.108, 1.434, and 1.8355. Take the abscissa as the standard solution solubility and the ordinate as the absorbance, and then use Excel to find the best linear equation to get the values ​​of m and n, that is, the standard curve is calculated as:

[0070] cL=0.3633A+0.0076, R2=0.9995

[0071] Add 800ml of deionized water to the wet sampling system 1. Based on the high-efficiency wet sampling system 1 disclosed in the patent number ZL200810020527.5, the average collection efficiency for the production environment of nano titanium dioxide powder is about 95.96%. Adjust the flow rate of the air flow meter in the wet sampling system 1 to 0...

Embodiment 2

[0076] In the nano zinc oxide powder production workshop, deionized water is added to the wet sampling system 1. Use the single-chip microcomputer to open the circulating water pump 6, the first solenoid valve 3 and the second solenoid valve 5, adjust the flow meter to 20ml / min, and close the circulating water pump 6, the first solenoid valve 3 and the second solenoid after the circulating trap fluid flows for 30 seconds. Valve 5, zero the UV spectrophotometer 2. Subsequently, the wet sampling system 1 is activated to start sampling, and the circulating water pump 6, the first electromagnetic valve 3, and the second electromagnetic valve 5 are automatically opened. Every 30s, the single-chip microcomputer automatically closes the circulating water pump 6, the first solenoid valve 3 and the second solenoid valve 5, and then stands still for 5 seconds. After reading the absorbance value sent by the ultraviolet spectrophotometer through the serial communication data line for three...

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Abstract

In order to lower the requirements of online detection technologies for objective factors, reduce the structural complexity and cost of detection equipment, improve the accuracy of detection on high-humidity or semi-volatile micro-nano aerosols and efficiently obtain micro-nano aerosol particle samples, the invention provides a wet type ultraviolet-absorption-method online detection method for micro-nano aerosol. Through the implementation of the invention, the wet type ultraviolet-absorption-method online detection method has the advantages that the effective online detection on high-temperature, high-humidity or semi-volatile micro-nano aerosols can be realized; in view of that ultraviolet absorption detection has characteristic detection wavelength, detection aiming at production dust can be effectively carried out without interference from other sources of dust; the on-site sampling of the micro-nano aerosol can be realized, so that the further detection on the physical and chemical properties of the aerosol is facilitated; the online detection cost of the micro-nano aerosol can be effectively reduced.

Description

Technical field [0001] The invention belongs to the on-line detection technology of micro-nano aerosols, in particular to a method for on-line detection of the concentration of micro-nano aerosols in the air using wet method and ultraviolet absorption method in a production environment. Background technique [0002] Micro-nano aerosol refers to a multi-phase system composed of solid or (and) liquid particles with at least one-dimensional particle size of micron, sub-micron or nano-scale, floating and flying in the air, and a gas carrier. Micro-nano aerosols can enter organisms through breathing, skin contact, etc., and participate in the digestive system and blood circulation system of the organisms, thereby causing great harm to the health of the organisms. [0003] At present, the principle of online detection of micro / nano aerosols in the production environment basically belongs to two methods: weighing method or light scattering method. Among them, the filter weighing method i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33G01N1/22
Inventor 茆平杨毅范柏超王连军冯曙艳
Owner NANJING UNIV OF SCI & TECH