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Corporation (OCF) for supporting the pilot-scale evaluation of the catalytic fabric filter concept. Also, the EERC would like to thank Raytheon Engineers & Constructors (RE&C) for their efforts in the completion of Task 4, Conceptual Design and Economic Evaluation, and their overall project technical support. The EERC Project Manager would like to specifically thank Ms. Felixa Eskey (DOE-PETC), Mr. Jack Pirkey (Con Edison), Dr. Aubrey Messing (ESEERCO), Ms. Debra DiMeo (ESEERCO), Dr. Patrick Aubourg (OCF), Ms. Marie Kalinowski (OCF), and Mr. Russ Potter (OCF) for their support and input concerning the catalytic fabric filter evaluation effort. Also, the efforts of Mr. Tony Taladay (RE&C) and Mr. Cameron E. Martin (RE&C) are gratefully acknowledged for their completion of Task 4 and overall project support. The EERC Project Manager, Mr. Greg Weber, would like to thank Mr. Grant Dunham, Mr. Dennis Laudal, Ms. Sumitra Ness, and Mr. Grant Schelkoph for their efforts in completing the various project tasks and contributing to the preparation of this final project report. The authors also gratefully acknowledge the efforts of a large number of EERC support staff who were instrumental in the completion of the experimental work as well as in the preparation of this final project report. Special recognition is due Mr. LeRoy Sbndrol for making the University of North Dakota (UND) steam plant available in support of Subtask 3.4-Fabric Durability Testing/Pulse-Jet System and Mr. Ray Tozer Jr. and the UND steam plant personnel for providing assistance with the day-today monitoring of the baghouse slipstream system operation. TABLE OF CONTENTS LIST OF FIGURES iii

The overall objective of this program was to develop a liquid desiccant-based flue gas dehydration process technology to reduce water consumption in coal-fired power plants. The specific objective of the program was to generate sufficient subscale test data and conceptual commercial power plant evaluations to assess process feasibility and merits for commercialization. Currently, coal-fired power plants require access to water sources outside the power plant for several aspects of their operation in addition to steam cycle condensation and process cooling needs. At the present time, there is no practiced method of extracting the usually abundant water found in the power plant stack gas. This project demonstrated the feasibility and merits of a liquid desiccant-based process that can efficiently and economically remove water vapor from the flue gas of fossil fuel-fired power plants to be recycled for in-plant use or exported for clean water conservation. Af'ter an extensive literature review, a survey of the available physical and chemical property information on desiccants in conjunction with a weighting scheme developed for this application, three desiccants were selected and tested in a bench-scale system at the Energy & Environmental Research Center (EERC). System performance at the bench scale aided in determining which desiccant was best suited for further evaluation. The results of the bench-scale tests along with further review of the available property data for each of the desiccants resulted in the selection of calcium chloride as the desiccant for testing at the pilot-scale level. Two weeks of testing utilizing natural gas in Test Series I and coal in Test Series J J for production of flue gas was conducted with the liquid desiccant dehumidification system (LDDS) designed and built for t h s study. In general, it was found the LDDS operated well and could be placed in an automode in which the process would operate with no operator intervention or adjustment.Water produced from this process should require little processing for use, depending on the end application. Test Series II water quality was not as good as that obtained in Test Series I; however, this was believed to be due to a system upset that contaminated the product water system during Test Series II. The amount of water that can be recovered from flue gas with the LDDS is a function of several variables, including desiccant temperature, WG in the absorber, flash drum pressure, liquid-gas contact method, and desiccant concentration. Corrosion will be an issue with the use of calcium chloride as expected but can be largely mitigated through proper material selection. Integration of the LDDS with either low-grade waste heat and or ground-source heating and cooling can affect the parasitic power draw the LDDS will have on a power plant. Depending on the amount of water to be removed from the flue gas, the system can be designed with no parasitic power draw on the power plant other than pumping loads. T h s can be accomplished in one scen...

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