Temperature control method and apparatus for the air supply in PFBC plants
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United States of America Patent
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Jul 25, 1995
Grant Date -
N/A
app pub date -
Mar 11, 1994
filing date -
Sep 13, 1991
priority date (Note) -
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Abstract
A method for temperature control of an air supply in PFBC plants which comprise a low-pressure unit including a low-pressure compressor and a low-pressure turbine, a high-pressure unit including a high-pressure compressor and a high-pressure turbine, wherein air is sucked into the low-pressure compressor whereupon the air is passed via an intermediate cooler, which is traversed by water, into the high-pressure compressor and then into a boiler of the plant. The method includes measuring in a temperature control system a temperature of the air both upstream and downstream of the high-pressure compressor, comparing the two measured temperature values and corresponding set values for the respective upstream and downstream temperature, and activating, based only on one of the comparisons, a shunt valve of an intermediate cooler. The control signal of the shunt valve consists of the output signal from the temperature control system.
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