Fang Mengxiang

Electrostatic Capture of PM2.5 Emitted from Coal-fired Power Plant by Pulsed Corona Discharge Combined with DC Agglomeration

How to improve ESP collection efficiency for PM2.5 is getting a matter of environmental concern. in this paper, a process capable of capturing PM2.5 efficiently was proposed, which utilizes a pulsed corona discharge combined with dc agglomeration. a laboratory-scale wire-plate electrode configuration was established. the particle electrostatic charging and number concentration distribution of PM2.5 have been measured by an electric low pressure impactor (elpi) at real time with the size range from 0.007 μm to 10 μm the particle charging and collection efficiency characteristics of PM2.5 were quantitatively investigated under different applied pulse peak voltage. the results show that for a certain given operating condition, PM2.5 collection efficiency increases with the increasing pulse peak voltage. dc voltage agglomeration is used to achieve a number reduction exceeding 90% on the submicron fraction of particles. this research may provide a new technology for efficient removal of PM2.5 from flue gas in coal-fired power plant.

Research on Coal Pyrolysis Property for Polygeneration Technology

A circulating fluidized bed heat-power-gas-tar polygeneration technology has been developed which is based on the property of coal pyrolysis. To study the effect of temperature and coal type on pyrolysis behavior, the pyrolysis process of four different types of coal was investigated by TGFTIR. The results showed that, at the heating rate of 25¿/min, pyrolysis process could be divided into four stages, namely drying stage, preheating stage, primary pyrolysis stage and secondary pyrolysis stage. Primary pyrolysis process was described as first-order reaction model and kinetic parameters were calculated by Coats-Redfern method at different temperature ranges. TG-FTIR coupled with kinetic analysis revealed the formation mechanism and variation of gas products, such as CO, CO2, CH4, during pyrolysis process. Pyrolysis laws provided a reference for achieving the target gas products by controlling temperature and selecting suitable coal type during polygeneration process.