| 摘要 |
<p>PURPOSE:To contrive to economize a makeup water, by forming at least a heat exchanging tube at a down stream side of a heat exchanger, by a carbon tube, in a case wherein an exhaust gas from a boiler and the like is cooled by the heat exchanger, a desulfurization by a wet type flue gas desulfurizating device is executed, and after a rising of a temperature of this is executed, an emission to an atmosphere is executed. CONSTITUTION:An exhaust gas from a boiler 1, after a denitration treatment by a denitration device 5, is cooled during passing through an air preheater 6, and a heat exchanger 8 in this order, and, after that, passes through a wet type flue gas desulfurizating device 9, and is exhausted from a chimney 3. In this occasion, at least heat exchanging tubes at a down stream side of a heat exchanger 8, are formed by carbon tubes. By this, the exhaust gas which is cooled to a low temperature is guided, as it is possible that the exhaust gas is cooled to 90 deg. or lower, for example, to about 50 deg.C without any worry about a corrosion of a tube. As a result, the decrease of the makeup water becomes possible at the wet type flue gas desulfurizating device 9, by making an evaporation quantity less, even if the gas and an absorption liquid execute a gas liquid contact in an absorption tower 10.</p> |
