Thermal efficiency for coal to power:from theoretical to practical assessments
The improvement in thermal efficiency for coal to power processes is increasingly important due to concerns on CO2 emissions and fossil fuel depletion.This paper presents a systematic study on direct combustion coal to power processes with respect to thermodynamic,technical and economic factors.Traditional exergy analysis focuses on irreversibilities in existing processes,while the new methodology investigates the thermal efficiency from its theoretical maximum to practical values by adding irreversibilities one by one.As a result of the study presented in this paper,various measures for increasing the thermal efficiency are proposed and the corresponding improvement potential is presented.The results also provide recommendations for further research.For a reference plant,the exergy of the coal feed is calculated to be 1.08 times the lower heating value,while the actual thermal efficiency is 45.5%when irreversibilities for the combustion reaction,the heat transfer between the flue gas and the working fluid(water/steam),the low temperature heat losses,the steam cycle and other factors are added.As an illustration,the individual measures to increase the thermal efficiency of the reference plant by 0.1%points are presented.
Thermal Efficiency Coal based Power Plant Irreversibility Exergy Steam Cycle
Chao Fu Rahul Anantharaman Kristin Jordal Truls Gundersen
Department of Energy and Process Engineering,Norwegian University of Science and Technology,Trondhei SINTEF Energy Research,Trondheim,Norway
国际会议
桂林
英文
1-13
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）