Design And Performance Of New Nano-aerosols Wet Collection Devices

This work adopted wet trap technique, solid-liquid adsorption theory and integrated many trapping methods, such as column tower spray, mist turbulent impinging to design a new nano-aerosol capture device. Discussed its structure and working principle, analysed its main components deeply.And then validated the various properties such as collection efficiency, the sensitivity to environment, operational stability and detection limit of nano-TiO2.The results showed that the new nano-aerosol capture device holds an outstanding property, is generally applicable to the various nano-aerosol particles, which has opened up a new way to the future development of nano-aerosol capture devices.This paper explored the optimal operating parameters by designing orthogonal and single-factor experiment that:capture flow rate was 0.6L/min, gas flow was 400L/h, spray flow was 70-80mL/min, acquisition time was 3h. Under the best operating parameters, the device efficiency can stabilize more than 96%. The experiment of the relationship between efficiency and dust concentration showed that under high dust concentration, the efficiency is better and the best capture time is shorter; under low concentration may consider extending the collection time appropriately to improve the efficiency.Based on sufficient realization of the construction and working principle of the device, this paper deeply analysed the major components' different contributions in collection effect. The results showed that atomizing nozzle and bubbles in liquidstorage bath hole have obvious influence on the collect efficiency. By changing the temperature, humidity and other conditions, examined the effect of the environmental factors affecting the device operation. Results showed that the temperature, humidity and other environmental conditions nearly have no effect on the device operation. Tested the operational stability status of the device by long-time and many-times experiments. Results showed that the device can run stability continuously for long time.This work explored the best limit of the device detection for nano-TiO2 aerosol: 0.18-17.09mg/m3 range and the device efficiency fluctuates between 95%-98%. By sampling nano-TiO2 in the workplace and making experiments, tested the device's running status, capture status in the production on-site environment. The results showed that running stability is well, trapping effect is obvious.