【作者】 丁丽娟；

【导师】 张树芳；

【作者基本信息】 华北电力大学 ， 工程热物理， 2011， 硕士

【摘要】 节能减排是世界共同关注的问题,工业生产中有大量余热被浪费尤其低温余热因品味低而不能被很好利用。为此本文以水泥工业为研究对象,用Matlab软件和数学偏微分方法对其纯低温余热发电方式进行优化选择。建立第一代纯低温余热发电方式的热力系统构成模式,通过混合热效率的计算比较,选出最佳模式。用数学偏微分方法对复合闪蒸补气式余热发电系统的闪蒸部分进行最佳分配,再结合第一代纯低温余热发电方式的相关参数边界条件及混合热效率的定义,采用Matlab软件拟合各个相关参数与混合热效率的关系图,通过对图形进行分析选出最优参数值和影响混合热效率最大的热工参数。运用Matlab软件拟合出影响混合热效率最大的多个热工参数与混合热效率的关系图,综合分析出这些热工参数的最佳值和混合热效率的最大值,选出最优的复合闪蒸补气式余热发电系统。对选出的复合闪蒸补气式余热发电系统进行优化前后的经济效益和社会效益比较,结果表明优化后的系统明显高于优化前的系统。通过课题的研究,深化了纯低温余热发电系统优化选择的理论及其编程过程,尤其闪蒸压力分配采用数学偏微分方法推导,减少了繁琐的程序优化过程,同时用图形化分析出最佳热工参数值,也减少了多个热工参数值参与编程的复杂而又难以实现的优化过程。课题结论及其闪蒸压力最佳分配的通用公式对水泥企业建立纯低温余热站具有重要的理论和现实意义。更多还原

【Abstract】 Energy conservation and emission reduction is a problem of the worldwide concern, plenty of waste heat is wasted in the industrial production and because of low-grageb especially low-temperature waste heat can not be well use. Take the cement industry as the research object and use the Matlab software and mathematical partial differential to select optimized pure low-temperature waste heat generate electricity mode.Establish the first generation of pure low-temperature waste heat generate electricity of thermodynamic system mode, through the comparison of mixed thermal efficiency of calculation, select the best mode.Make optimal allocation for compound flashing tonifying qi type waste heat power generation systems for flashing parts by using mathematical partial differential, combine with related parameters boundary conditions of the first generation of pure low-temperature waste heat generation and the mixed thermal efficiency of the definition, fit the relationship diagrams of each related parameters and the mixed thermal efficiency by using Matlab software, through the analysis of graphical, select optimal parameter values and the biggest thermal parameter which influence the mixed thermal efficiency.Find out the relationship figure the biggest multiple thermal parameter which influence the mixed thermal efficiency and the mixed thermal efficiency by using Matlab software, comprehensive analysis these thermal parameter of the best value and the mixed thermal efficiency of the maximum, select the optimal compound flashing tonifying qi type heat power generation system.Compared economic benefits and social benefit before and after, the results showed that the optimized system significantly higher than before.Through the research on topics, deepen theory to select the optimized pure low-temperature heat generation system and its programming process, especially flashing pressure distribution which derived by using mathematical partial differential, reduced the cumbersome optimization process, at the same time, worked out the best thermal parameter value by graph, also reduced the optimization process of the multiple thermal parameter values which involved in programming that it is complex and difficult to realize. The conclusion and flashing pressure of the universal formula of optimal allocation which has very important theoretical and practical significance to cement enterprises to establish pure low-temperature waste heat station.更多还原