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Analysis of coal polygeneration system based on structural theory of thermoeconomics |
XU Xu1,2 YU Zitao1, ZHANG Xiabo1, HU Yacai1, FANG Mengxiang1, CEN Kefa1 |
1.College of Mechanical and Energy Engineering, Zhejiang University, Hangzhou 310027, China;
2.College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China |
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Abstract The structural theory of thermoeconomics was applied to a 75 t/h coal combustion circle fluidized boiler polygeneration system. Four energy products including steam, electricity, fuelgas and tar were analyzed by the modeling on both unit exergy cost and thermoeconomic cost of all yields. Given the designed operating condition of the polygeneration system, some conclusions were deduced through above methods. Among the total energy products, the steam yield is most influenced by the price fluctuation of coal fuel. When the gasifier is operating at the range of 600 ℃ to 800 ℃, all yields from the polyenergy generation system are decreased with the elevation of running temperature of gasifier. The unit thermoeconomic cost of steam produced from the polygeneration system is 16.35% less than that yielded from the combined heat and power system, but as for the electricity generation, the cost rose from the polygeneration system is 20.57% less than that from the combined heat and power system. Such results show that the structural theory of thermoeconomics is a prospective tool for economical analysis on the power generation system and a potential reference for the optimal design and malfunction diagnosis.
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Published: 20 March 2012
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Corresponding Authors:
俞自涛,男,副教授.Email:yuzitao@cmee.zju.edu.cn
E-mail: yuzitao@cmee.zju.edu.cn
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基于热经济学结构理论的煤多联产系统性能分析
采用热经济学结构理论对75 t/h燃煤循环流化床锅炉的热、电、煤气、焦油的多联产能源系统进行了热经济学分析,提出了产品的单位成本和单位热经济学成本的计算模型.通过对系统设计工况进行分析发现:煤炭价格波动对蒸汽产品的单位热经济学成本影响最大;当气化炉在600~800 ℃运行时,所有产品的单位热经济学成本随着运行温度的升高而降低;利用多联产系统生产的蒸汽和电力产品单位热经济学成本比热电联产时的产品成本分别降低了16.35%和20.57%.研究结果为煤多联产系统热经济性分析与评价、优化设计以及故障诊断提供了参考.
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