Economic Analysis and Operation Simulation of Low Pressure Economizer System in 135 MW Thermal Power Plant

Low pressure economizer play an important role in reducing exhaust temperature and enhancing the thermal efficiency. This paper combines with 135MW power plant, in order to ensure its safe operation and the optimal economic conditions, the cost was considered. We put forward three designs, and considering the overall economic efficiency for low pressure economizer in different inlet temperature of the flue gas. According to the equivalent enthalpy drop method the thermal economies of the designs are calculated, and the results show that the second design low pressure economizer in 150°C entering flue gas temperature is better than the other two. And simulation of this design under different flue gas temperature is taken place. We get the operation programs in different flue gas temperature. These regulation programs can provide some theoretical reference for production.