Fine Particle Removal at High Temperatures Using Ceramic Material Combinations and External Electric Fields
Reliable and efficient hot gas cleaning techniques in the temperature range of 900℃ and above are scarce,and separation efficiencies become inadequate when surface filters can no longer be used.Thus,a new method of fine particle removal from hot exhaust gas in the temperature range up to 1400℃ was developed for a Pressurized Pulverized Coal Combustion (PPCC) process.Using granular bed filters,the efficiency of these devices is boosted by using a ceramic material combination and applying weak external electrical fields of a few volts.Although the method achieved excellent clean gas concentrations below 3 mg/m3,the result was achieved mainly by trial and error.Thus,basic investigations were performed to study the particle charging and collection process systematically.The efficiency of fine particle charging and removal using different pairs of ceramics is being measured for temperatures between 900℃ and 1100℃,using a laboratory setup to generate fine particles of defined size and to detect the concentration and the mean electric charge of the residual particles for different collection field strengths.Electrochemical impedance spectroscopy is performed on the ceramic combinations in order to measure different modes of conductivity (oxygen ions,electrons) and learn more about the mechanism giving rise to the improved removal of particles
fine particle removal:ceramic combinations:electrostatic precipitation:particle charging
D. Wenzel J. Meyer K.Reuter-Hack M. Müller
IEF-2,Forschungszentrum J ülich,Jülich,Germany MVM,Karlsruhe Institute of Technology,Karlsruhe,Germany
国际会议
The 8th International Symposium on Gas Cleaning at High Temperatures(第八届国际高温气体净化技术研讨会 GCHT-8)
太原
英文
278-287
2010-08-23（万方平台首次上网日期，不代表论文的发表时间）