The cogeneration plant is a power plant that utilizes its waste heat for an industry, therefore the a cogeneration plant has higher efficiency compare to the conventional power plants. The most important component in the cogeneration plant
is the Heat Recovery Steam Generator (HRSG), which serves to produce pressurized steam by boiling water using waste heat from the gas turbine. PT. Dian Swastatika
Sentosa is one of the industries that apply a cogeneration plant system to produce steam which will be used for paper mill. Steam generated by PT. Dian Swastatika
Sentosa comes from HRSG A, HRSG B, and Coal Fluidized Boiler (CFB). However, there are constraints found in the operation of CFBs, that CFBs cannot produce the
expected steam since there is disruption in the CFBs for the last few months. This research discusses the optimization of cogeneration plant at PT. Dian Swastatika Sentosa while the CFBs are eliminated in the steam production process, thus the
steam is only produced by HRSG A, and HRSG B. The steam required for paper processing is 11 kg/s, therefore HRSG A and HRSG B must produce steam of 11 kg/s to be used for paper processing. The research has been done experimentally by adjusting mass flow rate in HRSG A (m? 1') and HRSG B (m?
') according to the scenario and condition which have been determined in the pre experiment calculation. The optimization of the cogeneration plant in PT. Dian Swastatika Sentosa has been conducted using scenario 2 in the pre experiement calculation, i.e. by adjusting the steam mass flow rate of 51% for HRSG A (m? 12') and 49% for HRSG B (m?'). During the experiment, the total mass flow rate supplied for papper mill is
10,776 kg/s, which consists of 5,482 kg/s from HRSG A (m?21') and 5,294 kg/s from HRSG B (m?'). Eventhough this total mass flow rate is 2.14% lower than the desired
mass flow rate, the paper production process is not disturbed by the optimization. Optimization with scenario 2 results in the nett power of 3344.63 kW for PLTG A and 3328.33 kW for PLTG B, the required heat of combustion chamber (Qin) are
13990.76 kW for PLTG A and 13466, 462 kW for PLTG B, and the waste heat from the gas turbine (Qp) are 10646,086 kW from PLTG A and 10138.132 kW from PLTG B. |