A Two-Stage ORC Integration to an Existing Fluidized Bed Sewage Sludge Incineration Plant for Power Production in the Scope of Waste-to-Energy

Authors : Ayşegül ABUŞOĞLU, Alperen TOZLU, Amjad ANVARİ-MOGHADDAM

Pages : 109-121

Doi:10.5541/ijot.994813

View : 13 | Download : 6

Publication Date : 2022-03-01

Article Type : Research Paper

Abstract :This paper presents the design, evaluation, and optimization of an electricity generation system based on the two-stage organic Rankine cycle insert ignore into journalissuearticles values(TS-ORC);, which utilizes the waste heat of an existing fluidized bed sewage sludge incineration insert ignore into journalissuearticles values(FBSSI); facility. The facility incinerates an average of 300 tons per day of sewage sludge with a dry matter content of 22%. After the drying process, the sewage sludge is burned in a fluidized bed combustor, and exhaust gas at a temperature of about 850-900ºC is released due to the combustion. The system provides the energy required to dry the sludge from this exhaust gas. In this study, a TS-ORC is designed to be coupled to the exhaust gas flowlines discharged to the atmosphere at two different points in the FBSSI plant. The exergy efficiency of the FBSSI facility is found to be 70.5%. Three different working fluids are selected to examine the variations of thermodynamic and thermoeconomic performance parameters of the designed TS-ORC system. The highest power generation in the TS-ORC system insert ignore into journalissuearticles values(183.40 kW); is achieved using R1234yf as working fluid. R1234yf is also the most expensive fluid for electricity generation among the other working fluids insert ignore into journalissuearticles values(10.57 $/h);. The least electricity generation in the TS-ORC insert ignore into journalissuearticles values(142.70 kW); occurs at the thermoeconomically most affordable cost with R245fa insert ignore into journalissuearticles values(9.35 $/h);.
Keywords : Fluidized bed sewage sludge incineration, ORC, thermodynamic, thermoeconomy, waste to energy, multi objective optimization