Along with the construction of many coal-fired power plants, the supply of bituminous coal has become a key interest in China. An increasing number of coal-fired power plants consume lignite. However, lignite-fired power plants feature a very low plant thermal efficiency. But by means of lignite predrying, the efficiency of the lignite-fired power system can be improved, and the recovery of waste heat from the dryer can improve the plant thermal efficiency further. In the present article a theoretical model of the predried lignite–fired power plant with the waste heat recovery system based on basic thermal principles is developed and an existing case is analyzed. The above plant was shown to enhance the thermal efficiency of a conventional lignite-fired power plant by approximately 2.45%, which is 0.58% higher than predried lignite–fired power plant without waste heat recovery. Moreover, the influence of system parameters on the improvement of the plant thermal efficiency is determined. The results can be used in optimization of a waste heat recovery system in the thermodynamic process to increase the economy of lignite-fired power plants.
No takes yet. Share an insight, caveat, or question.
Guo et al. (2012) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: