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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 problem that the energy consumption of carbon capture and desorption after combustion of thermal power unit and the steam consumption of liquid ammonia evaporator of denitrification system affect the thermal performance of coal-fired units, the mechanism of CO2 absorption by alcohol amine was studied and the energy consumption model of CO2 desorption was established. Mechanism, build steam consumption model. The integration of solar thermal system for desorption of carbon capture system and heat extraction for the denitrification system is proposed. Based on the structure theory of thermal economics, the mathematical model of thermal economics cost of components in integrated system is established. The reasons for the increase of cost of each component in the system and the influence of fuel price fluctuation on the performance of components are studied. The results show that the energy consumption of ethanolamine absorbent is 4.5 MJ / kg CO2, the steam consumption of denitrification system is 0.25 t / h, the thermal efficiency of the integrated system is 1% higher than that of the original system, and the component efficiency and component irreversibility affect the components of the integrated system The main factor of unit cost; the main factor affecting the cost of thermal economics is the irreversible cost and the cost of equipment investment; the main factor affecting the cost of thermal economics of solar thermal field is the investment cost of solar thermal field, the negative entropy cost and the irreversible cost ; Coal price fluctuations have a greater impact on power generation costs.