Assessment of Hot ESPs as Particulate Collector for Oxy-coal Combustion and CO2 Capture
Considerable effort is spent on development of technologies for CO2 capture and storage (CCS) to stabilise atmospheric levels of greenhouse gases. Oxy-coal combustion is one promising technical option for the CO2 capture from coal-fired power generation. A 30 MWth pilot oxy-coal fired power plant has been built by Vattenfall at Schwarze Pumpe in Germany to demonstrate the CCS technology. Lignite and bituminous coals will be tested for the oxy-coal combustion and CO2 capture. The flue gas cleaning system comprises electrostatic precipitator (ESP), scrubber and condenser. The ESP-often referred to as a cold ESP when it is placed downstream an air preheater in a conventional air fired plant-operates at a temperature below 200 ℃.Conceptual studies are in progress for a full-scale demonstration plant and an attractive option is to have the ESP operating around 350 ℃ to improve the overall thermal efficiency of the oxy-coal concept. Such an ESP is frequently referred to as a hot ESP and is placed upstream the air preheater. This paper will review the oxy-coal combustion and CO2 capture and discuss the advantages with an ESP operating at a high temperature. It will also review the existing experience with hot ESPs built in the 1960s and 1970s mainly in USA. Most of these plants were later converted to cold ESPs operating at a temperature of around 150 ℃. The main reason for these conversions was the so-called sodium depletion in the fly ash that caused the ESP performance to deteriorate below acceptable levels. The sodium depletion resulted in high resistivity ash and back-corona conditions. The poor performance prevented any further installations of hot ESPs. When discussing the feasibility of hot ESPs for oxy-coal combustion consideration is paid to the fact that numerous conventional cold ESPs today reach low emissions in spite of high resistivity ash.
Electrostatic Precipitator ESP Hot-side ESP CO2 capture High resistivity Sodium depletion Na Rapping Oxyfuel Oxy-coal
Kjell PORLE Andreas B(A)CK J(o)rgen GRUBBSTR(O)M Stephen L.FRANCIS Jinying YAN Stina RYDBERG
ESP-APC Technologies H(o)gstorpsv(a)gen 125,SE-352 42,V(a)xj(o),Sweden Alstom Power Sweden AB P.O.Box 1233,SE-351 12,V(a)xj(o),Sweden Alstom Power Inc.1409 Centerpoint Blvd.,Knoxville,TN 37932,USA Vattenfall R&DAB J(a)mtlandsgatan 99,SE-162 87,Stockholm,Sweden VattenfaU Power Consultant P.O.Box 475,SE-401 27,G(o)teborg,Sweden
国际会议
11th International Conference on Electrostatic Precipitation(第11届国际电除尘学术会议)
杭州
英文
513-517
2008-10-15（万方平台首次上网日期，不代表论文的发表时间）