Dust particle size and concentration nondestructive on-line detection device and method

Abstract

The invention discloses a dust particle size and concentration nondestructive on-line detection device and method. The detection device comprises a detection chamber, the detection chamber is providedwith a particle acceleration nozzle, a gas inlet pipe and a gas outlet joint, and the particle acceleration nozzle is provided with a sample gas channel and an annular zero gas channel wrapping the sample gas channel; and the particle acceleration nozzle comprises an arc-shaped contraction channel and a throat channel, the gas outlet joint comprises an expansion channel, the small-diameter end ofthe expansion channel is aligned and matched with the throat channel, the gas inlet pipe comprises a sintering inner pipe and an outer sleeve, the sintering inner pipe is fixedly sleeved with the outer sleeve, an independent zero gas cavity is formed, and the zero gas cavity is communicated with an inner cavity of the sintering inner pipe through micropores in the sintering inner pipe. Accordingto the detection method, nondestructive detection is carried out by utilizing the detection device, so that dust attachment can be reduced, the influence of resistance change of the filter on the sampling flow rate can be reduced, and the accuracy of a detection result is improved.

Description

Technical field [0001] The invention relates to a non-destructive online detection device for dust particle size and concentration, and also relates to a non-destructive online detection method using the online detection device. Background technique [0002] In the atmosphere, most pollutants are attached to the surface of aerosol particles. The particle size of aerosols is generally 0.001-100 microns. It has been found that particles with an aerodynamic diameter above 50 microns cannot enter people due to gravity. In the respiratory tract, particles in the range of 10-50 microns can only enter the nasopharynx, particles in the range of 2.5-10 microns can usually enter the bronchus, and 80% of particles below 2.5 microns can enter the human alveoli. The online detection of particle size and concentration of particles in the gas is widely used. For example, the patent application No. 201910373520.X discloses an online detection device and method for particle size and particle conc...

AI Technical Summary

Problems solved by technology

However, the current online detection device still has the following disadvantages: 1. The current detection device cannot perform non-destructive testing, that is to say, during the detection process, dust may adhere to the pipe wall, resulting in the loss of dust. The result is not accurate; 2. The light source of the current detection device cannot be adjusted, and the light source assembly process cannot be troublesome. Repeated comparisons, result verification and other operations are required to ensure the fixed and accurate position of the light source; 3. The current one When the detection device is used, the air outlet connector is connected to the sampling pump as the sampling power. A filter needs to be installed upstream of the sampling pump to filter dust particles. When the value is large, the sampling gas flow rate of the actual detection device will become smaller, which will affect the accuracy of the detection results

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