摘要
针对火电机组燃烧后碳捕集解吸能耗及脱硝系统液氨蒸发器蒸汽消耗对燃煤机组热力性能影响的问题,研究醇胺法吸收CO2的机理,建立CO2解吸能耗模型;研究液氨脱硝机理,建立蒸汽消耗模型。提出以太阳能热为碳捕集系统解吸提供热源、机组抽汽为脱硝系统提供热源的一体化集成系统。基于热经济学结构理论,建立集成系统中组件的热经济学成本数学模型;研究系统中各组件成本增长的原因及燃料价格波动对组件性能的影响。研究结果表明:乙醇胺吸收剂解吸能耗为4.5 MJ/kg CO2;脱硝系统蒸汽消耗为0.25 t/h;集成系统的热效率比原系统提高1%;组件效率及组件比不可逆是影响集成系统中组件单位成本的主要因素;热经济学成本主要影响因素为比不可逆成本和设备投资成本;影响太阳能集热场热经济学成本的主要因素为太阳能集热场投资成本、比负熵成本和比不可逆成本;煤价波动对发电成本的影响较大。
Aiming at the effect of desorption energy consumption of carbon capture and steam consumption of denitration system liquid ammonia evaporator post-combustion of thermal power on thermodynamic performance of coal-fired unit, the CO2-absorbing mechanism of ethanolamine method was studied, the energy consumption model of CO2 desorption was set up. The denitration mechanism of liquid ammonia was researched and the model of steam consumption was set up. The integration system with solar energy as heat source for desorption of carbon capture system and steam extraction of thermal power as the heat source for denitration system was presented. The mathematical model of thermoeconomics cost in integrated system was set up based on structure theory of thermoeconomics; the effect of cost-growing reason of components in system and fluctuation of fuel price on components＇ performance was studied. The results show that desorption energy consumption of ethanol absorbent is 4.5 MJ/（kg CO2）, steam consumption of denitration system is 0.25 t/h, the thermal efficiency of integrated system raises 1%. The main factor affecting unit exergy cost in component unit of integrated system is component exergy efficiency and irreversible investment cost of exergy. The main factor affecting thermoeconomics cost is irreversible exergy cost and exergy cost of equipment investment. The main factor affecting thermoeconomics cost of solar collecting field is exergy investment cost of solar collecting field, unit＇ s negentropy exergy cost and per unit＇ s irreversible exergy cost. The effect of the fluctuation of coal price on power generating cost is important.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2016年第2期430-438,共9页
Acta Energiae Solaris Sinica
基金
河北省教育厅基金项目(QN2015108)
科学研究与研究生培养共建项目(GJ2013017)
河北省自然科学基金青年基金(E2014502005)
关键词
乙醇胺
碳捕集
脱硝
槽式太阳能集热场
集成系统
热经济学
ethanolamine
carbon capture
denitration
parabolic trough collecting field
integrated system
thermoeconomics
