Abstract
There are several ways to improve performance of Rankine cycle which is implemented at steam power plant, regenerative feedwater heating is one of the methods. Some failures in closed feedwater heaters such as, water leak through manhole and tube leakage may happen during operation of the plant. Repairing such failures may take some period of time and must shut off the operation of the feedwater heaters. Further study is needed to evaluate the effect of closed feedwater heater in off-service condition against the steam power plant’s performance. This study varies off-service condition of closed feedwater heaters applying thermodynamics analysis and modeled through Cycle-Tempo software. There are 12 possible feedwater heater operation schemes. Based on the heat balance and equipment design of a 200 MW Steam Power Plant at Jakarta-Indonesia, this study concluded that the NPHR might increase as much as 0.96% and 0.39% due to the off-service of any HPH and the off-service of any LPH respectively. Schemes of 2 off-service feedwater heaters summed up with 1.37% increase of NPHR .
Highlights
There are several ways to improve performance of Rankine cycle which is implemented at steam power plant, regenerative feedwater heating is one of the methods
For variation 6 (HPH F off), the Net Plant Heat Rate (NPHR) will raise to 2.513 kCal/kWh or about 0.96% higher than that of normal condition
For variation 12 (LPH C and HPH F off), the NPHR will increase to 2,523 kCal/kWh or 1.37% higher than that of normal condition
Summary
There are several ways to improve performance of Rankine cycle which is implemented at steam power plant, regenerative feedwater heating is one of the methods. This study varies off-service condition of closed feedwater heaters applying thermodynamics analysis and modeled through Cycle-Tempo software. By adding either open feedwater heaters and/or closed feedwater heaters, the efficiency of the cycle will increase [2] This is due to the raise of the mean feedwater temperature at the boiler inlet which is heated by the extraction steam. The cycle-tempo software has been known as a program to perform thermodynamic modeling and system optimization for electricity production [5] It was reported by [6] that modelling and simulating has been conducted to a coal power plant with a capacity of 62.5 MW to obtain maximum efficiency value of the power plant using cycletempo software.
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