生物质气化耦合化学链技术氨电联产系统的火用分析

Exergy analysis of ammonia-electricity cogeneration system by biomass gasification coupled with chemical looping technology

关键词:  生物质气化  化学链技术  化学链制氨  氨  火用分析 

Key words:  biomass gasification  chemical looping technology  chemical looping ammonia production  ammonia  exergy analysis

摘要:

目的 基于化学链技术开发一种清洁高效的生物质制氨系统。方法 综合考虑系统的自热操作、经济性和碳排放要求,对系统分别进行了热力学分析、经济评价和参数优化,重点探究了化工单元和动力单元的耦合。结果 以生物质为原料实现了氨气和电的联产。当生物质进料量为1 kg/s时,得到如下优化结果:①热力学性能方面,氨产率为13.82 mol/s,能量效率为0.45,燃料能源节约率为12.16%；②经济性方面,制氨成本为0.461 $/kg NH₃；③环境方面,碳排放量为0.978 kg/kg NH₃。结论 证实了该设计理念的可行性,为后续工业化化学链制氨工艺设计和优化提供理论依据。 

Abstract:

Objective A clean and efficient biomass-to-ammonia system based on the chemical looping technology has been developed. Methods Considering comprehensively the self-heating operation, economy and carbon dioxide emission requirements of the system, the thermodynamic analysis, economic evaluation and parameter optimization of the system were carried out, and the coupling of chemical unit and power unit was emphatically explored. Results The system achieved multiple co-production of NH₃ and electricity from biomass.When the biomass feed rate was 1 kg/s, the following optimization results were obtained:(1) In terms of thermodynamic performance, ammonia yield was 13.82 mol/s, energy efficiency was 0.45 and fuel energy saving rate was 12.16%; (2) In terms of economic performance, the ammonia production cost is 0.461 $/kg NH₃; (3) In terms of environment, the carbon dioxide emission is 0.978 kg/kg NH₃. Conclusion sThe feasibility of the design concept is confirmed, which provides a theoretical basis for the design and optimization of the subsequent industrial chemical looping ammonia production process.