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[quote]QUOTE: Originally posted by futuremodal Mark in Utah - The ability to recirculate water seems to be able to work just as easily for a closed loop pipeline as in a generating plant, if not easier. The generating plant needs to keep the water clean to keep from damaging boilers, injectors, et al. The coal pipeline water only needs to be purged of things that might block the pumps. There would be an efficiency cost in such a system, the question then is the overall capital cost of a closed loop coal pipeline vs the overall capital cost of new rail tracks. [/quote] You missed what I said earlier. The closed loop system is for steam generation for the boiler & turbine. The open loop system is for condensing the steam (cooling) back out so you can pump the clean water back into the boiler. Without the cooling system, which uses "dirty" water, you MUST use once-through clean water for the boiler. Power plant boiler water is VERY clean. You just wi***hat your drinking water was as clean. Distilled, PH balanced, no solids, etc. The chemistry is tightly controlled to prevent costly corrosion in the boiler and condenser tubes. The cooling tower water's chemistry has a tightly controlled chemistry as well to reduce corrosion of the cooling tower. The water just isn't as clean, and is high in solids due to the partial evaporation of the water. A pipeline would use MUCH more water than any equivalent power plant. In your thinking you also must include the power consumption at the receiving terminal of the coal driers, as well as the "pumps" along the pipeline route, which is not inconsequential. Mark in Utah
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