foerfarande foer and device to regulate the air temperature and begraensa paa in a pfbc - anlaeggning ingaaende hoegtryckskompressors in - and outlet

摘要

PCT No. PCT/SE92/00615 Sec. 371 Date Mar. 11, 1994 Sec. 102(e) Date Mar. 11, 1994 PCT Filed Sep. 8, 1992 PCT Pub. No. WO93/06350 PCT Pub. Date Apr. 1, 1993.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.