Energy and water conservation at lignite-fired power plants using drying and water recovery technologies

Abstract Lignite is considered as a competitive energy raw material with high security of supply viewed from a global angle. However, lignite-fired power plants have many shortcomings, including high investment, low energy efficiency and high water use. To address these issues, the drying and water recovery technologies are integrated within lignite-fired power plants. Both air-cooling and wet-cooling units with three kinds of lignite as feeding fuel were analyzed quantitatively. Results showed that energy conservation and water conservation are obtained simultaneously. The power plant firing high moisture lignite becomes more environmental friendly with higher power generation efficiency and a lower water makeup rate than the one firing low moisture lignite. And further calculation revealed that the air-cooling unit needs no makeup water and even produces some water as it generates power, when the water carrying coefficient is higher than 40 g/MJ.

[1]  L. Biegler,et al.  Multiperiod design and planning with interior point methods , 1999 .

[2]  Waldyr Luiz Ribeiro Gallo,et al.  A comparison between the hat cycle and other gas-turbine based cycles: Efficiency, specific power and water consumption , 1997 .

[3]  Sam Clayton,et al.  Dewatering of Biomaterials by Mechanical Thermal Expression , 2006 .

[4]  Timothy J. Skone,et al.  Water: A critical resource in the thermoelectric power industry , 2008 .

[5]  Arun S. Mujumdar,et al.  Drying of Low-Rank Coal (LRC)—A Review of Recent Patents and Innovations , 2011 .

[6]  Nancy L. Barber,et al.  Estimated use of water in the United States in 2005 , 2009 .

[7]  A. Mujumdar.  Handbook of Industrial Drying , 2020 .

[8]  Yasuki Kansha,et al.  Self-heat recuperative fluidized bed drying of brown coal , 2011 .

[9]  Juan M. Salazar,et al.  Minimization of water consumption under uncertainty for a pulverized coal power plant. , 2011, Environmental science & technology.

[10]  E. Rubin,et al.  The cost of carbon capture and storage for natural gas combined cycle power plants. , 2012, Environmental science & technology.

[11]  Edward S. Rubin,et al.  Comparative Performance and Cost Assessments of Coal- and Natural-Gas-Fired Power Plants under a CO2 Emission Performance Standard Regulation , 2013 .

[12]  Feng Xiao,et al.  Theoretical Study and Case Analysis for a Predried Lignite-Fired Power System , 2011 .

[13]  Yue-min Zhao,et al.  Comparative studies on the effect of mineral matter on physico-chemical properties, inherent moisture and drying kinetics of Chinese lignite , 2015 .

[14]  Ming Liu,et al.  Thermodynamic analysis of pre-drying methods for pre-dried lignite-fired power plant , 2013 .

[15]  J. P. Gerling,et al.  Lignite and hard coal: Energy suppliers for world needs until the year 2100 — An outlook , 2007 .

[16]  A. Doukelis,et al.  Simulation of a Greenfield oxyfuel lignite-fired power plant , 2007 .

[17]  E. Rubin,et al.  Water use at pulverized coal power plants with postcombustion carbon capture and storage. , 2011, Environmental science & technology.

[18]  E. Kakaras,et al.  Computer simulation studies for the integration of an external dryer into a Greek lignite-fired power plant , 2002 .

[19]  Heng Li,et al.  Escalating water demand for energy production and the potential for use of treated municipal wastewater. , 2011, Environmental science & technology.

[20]  Anton Friedl,et al.  Increasing power plant efficiency by fuel drying , 1999 .

[21]  Feng Xiao,et al.  Theoretical Study and Case Analysis of a Predried Lignite–Fired Power Plant with the Waste Heat Recovery System , 2012 .

[22]  Janusz Kotowicz,et al.  Enhancing the overall efficiency of a lignite-fired oxyfuel power plant with CFB boiler and membrane-based air separation unit , 2014 .

[23]  P. Grammelis,et al.  Experimental investigation on the combustion behaviour of pre-dried Greek lignite , 2009 .

[24]  G. Heath,et al.  Operational water consumption and withdrawal factors for electricity generating technologies: a review of existing literature , 2012 .