Heat Transfer Analysis in High Pressure Heater (HPH) of Circulating Fluidized Bed (CFB) Boiler on the Steam Turbine PLTU Teluk Sirih Unit 2

A pressure heater (HPH) is a heat exchange device that is widely used in industry, including power plants such as PLTU Teluk Sirih Unit 2, which uses steam as the working fluid. HPH works by changing the phase and temperature of the fluid with other fluids, such as the results of steam extraction from a turbine. HPH functions as a preheater to feed water before it enters the boiler. By operating the HPH, the boiler workload will be lighter because the water entering the boiler has a high temperature. This research was conducted to determine the initial performance of HPH - 1 and HPH - 2 shell and tube heat exchanger types and determine work efficiency performance using thermodynamic and heat transfer calculation methods. From the results of the research carried out, it was found that the increase in terminal temperature difference (TTD) in the HPH 1 preheater was 2, 453 ?C, and HPH 2 was 13, 097 ?C. The increase in drain cooler approach (DCA) for the initial heater (HPH 1) is 18.2 ?C; for the initial heater 2 (HPH 2), it is 32.77 ?C. The increase in temperature rise (TR) at HPH 1 was 3.24 ?C; for HPH 2 it was 9.42?C. In the log mean temperature difference, there was an increase in HPH 1 of 26.84 ?C and in HPH 2 of 39.68 ?C. Heat exchanger effectiveness decreased at HPH 1 by 0.079% and at HPH 2 by 0.169%.