A novel lignite-fired power plant integrated with a vacuum dryer: System design and thermodynamic analysis

Modified High Back-Pressure Heating System Integrated with Raw Coal Pre-Drying in Combined Heat and Power Unit

“…Coal pre-drying (mainly for lignite and subbituminous) has been verified to be a practical approach to enhance the performance of the boiler and reduce the energy loss and emissions of exhaust flue gas [29,30]. References [31][32][33][34] reported that lignite is possible to be dried by low-grade (50-150 • C) heat sources, such as low-temperature air, steam, and flue gas, which can remove most of the surface water involved in the lignite. Hence, the exhaust steam (approximately 34-54 kPa and 72-83 • C, saturated) of a HBP turbine is adequate to offer energy for the desiccation of lignite.…”

Investigation on the off-design performances of flue gas pre-dried lignite-fired power system integrated with waste heat recovery at variable external working conditions

“…The comparison [19] between flue gas pre-drying system and steam pre-drying system showed that steam predrying had a higher potential in plant thermal efficiency improvement. Besides, the proposal of different types of dryers integrated with power systems (e.g., combined-type fluidized bed dryer [20], vacuum dryer [21]) and thermodynamic calculations on the efficiency improvements can be found in recent studies. These studies are of great significance since they have pointed out the efficiency improvement and environment protection aspects of PLPSs.…”

Theoretical Analysis of a Lignite-Fired Power Plant with Pre-Drying System in Terms of Energy Efficiency and Economy

“…When low pressure steam is used as a heat source in a lignite fired power plant with a vacuum dryer integrated, the net efficiency of the plant is 2.39%. When the heat pump is used, it is concluded that the net efficiency of the plant increased by 1.88% [10]. In an experimental study, a small-scale fluidized bed dryer set is established.…”