| 摘要 |
PURPOSE:To prevent sulfuric acid corrosion in a flue, by fixing gas temperature of an exhaust gas economizer outlet to collect thermal energy of exhaust gas and reducing a quantity of collective heat to prevent a decrease of the outlet gas temperature in case of low temperature of the exhaust gas. CONSTITUTION:When exhaust gas temperature thetaa of a main engine is decreased below a preset value thetas, an output thetab of an amplifier 61 increases. While an evaporator coil bypass valve 40 increases its opening in accordance with the output thetab if increased, and a quantity of circulating water flowing into an evaporator coil 36 increases if the output thetab increases, then a heat transfer quantity is decreased by the drop of exhaust gas temperature of the main engine. This results in a change of collection of thermal energy in exhaust gas of the main engine in accordance with temperature of exhaust gas, as a result outlet temperature of an exhaust gas economizer 33 is controlled to constant. |
