DEVICE FOR INCORPORATING THE PURIFIED-GAS DUCTS FROM A FOSSIL-FUEL POWER STATION DESULPHURIZATION PLANT IN A NATURAL-CONVECTION WET COOLING POWER

摘要

The invention concerns a device for incorporating, in a natural-convection wet cooling tower, the purified-gas ducts from the desulphurization plant of a fossil-fuel power station in a way which avoids the need to build chimneys. The aim of the invention is to lower capital costs, to ensure that the gases entering the cooling tower do not make contact with the walls of the cooling tower and to ensure that the gases and cooling-tower steam clouds do not mix, the stream of purified gas being discharged centrally, surrounded by the steam. This is achieved by virtue of the fact that the purified-gas lines (4) pass from the outlet flange (3) of the desulphurization plant (2) directly and in a straight line, with or without support structures, through the cooling-tower wall (4) and with a change in direction (8) into the middle of the cross-section of the cooling tower, the gas outlet flange (3) being located at a significantly higher level than the water-distribution level, i.e. at least at the same level as the outlet flange (3) from the desulphurization plant. The change in direction involves vertical outlet pipes and guide vanes (6). The outlet pipes are at an angle such that the gas jet emerging vertically from the centre of an outlet passes through the axis of symmetry of the cooling tower at the level of an upper ring girder (9). The length of each vertical outlet pipe is at least 1.5 times the diameter of the purified-gas pipe.