Multiple pollutant removal using the condensing heat exchanger: Phase 1 final report, October 1995--July 1997

Abstract

McDermott Technology, lnc. assumes no liability with respect to the use of, or for damages resulting from the use of, or makes any warranty or representation regarding any information, apparatus, method, or process disclosed in this report.McDermott Technology, Inc. expressly excludes any and all warranties either expressed or implied, which might arise under law or custom or trade, including without limitation, warranties of merchantability and of fitness for specified or intended purpose.. warranties of merchantability and of fitness for specified or intended purpose.. 11-14-96Customer Feedback QuestionnairePlease help us do a better job for you. RC-447Report This report covers the results of the first phase of this program. This Phase I project has been a two year effort. Phase I includes two experimental tasks. One task dealt principally with the pollutant removal capabilities of the lFGT at a scale of about 1.2MWt. The other task studied the durability of the Teflon@ covering to withstand the rigors of abrasive wear by fly ash emitted as a result of coal combustion.The pollutant removal characteristics of the IFGT system were measured over a wide range of operating conditions. The coals tested included high, medium and low-sulfur coals. The flue gas pollutants studied included ammonia, hydrogen chloride, hydrogen fluoride, particulate, sulfur dioxide, gas phase and particle phase mercury and gas phase and particle phase trace elements. The particulate removal efficiency and size distribution was investigated. These test results demonstrated that the IFGT system is an effective device for both acid gas absorption and fine particulate collection. Although soda ash was shown to be the most effective reagent for acid gas absorption, comparative cost analyses suggested that magnesium enhanced lime was the most promising avenue for future study.The durability of the Teflon@ covered heat exchanger tubes was studied on a pilot-scale singlestage condensing heat exchanger (CHX@). This device was operated under typical coal-fired flue gas conditions on a continuous basis for a period of approximately 10 months. Data from the test indicate that virtually no decrease in Teflon@ thickness was observed for the coating on the first two rows of heat exchanger tubes, even at high inlet particulate loadings. Evidence of wear was present only at the microscopic level, and even then was very minor in severity.i of xv