Simulation Study of the 18 MW Condensing Power Plant at Coke-Oven Plant Кокс-Эрчим Хүчний Үйлдвэрийн Дэргэдэх 18 МВт Чадалтай Конденсацийн Цахилгаан Станцын Загварчлалын Судалгаа

Abstract

Due to climate change, air pollution, greenhouse gas emissions, and the scarcity of energy resources worldwide, coupled with a sharp increase in prices, countries face an urgent need to review their energy policies. They need to shift away from solid fuels toward renewable energy and waste heat from industrial processes for energy production. Using heat recovery steam generators (HRSGs) in industrial processes can reduce fuel consumption and repurpose high-potential flue gases from coke, cement, and chemical plants to heat water, produce steam, and generate electricity in thermal power plants. Heat recovery steam generators enable the most efficient use of waste gas heat from industrial processes. This research paper presents a thermodynamic model of an 18 MW condensing power plant (CPP), featuring three boilers and three turbines. The model utilizes a heat recovery steam generator operating at 950°C with a mass flow rate of 72 t/h from the waste gas heat of the coke-oven plant. This study examines the 18 MW condensing power plant's operating performance and techno-economic indices under design and off-design conditions. The impact of changes in waste gas parameters (temperature and mass flow rate) from the coke-oven plant on the operating performance and techno-economic indices of the 18 MW condensing power plant was also studied. A simulation was developed to install an additional gas fuel burner in the heat recovery steam generator that utilizes waste gas heat, aiming to maintain the operating performance and techno-economic indices of the 18 MW condensing power plant at a nominal load when the flue gas parameters change.