太阳能辅助CO_(2)高温热泵干燥系统生命周期性能分析  

Life cycle performance analysis of solar energy assisted transcritical CO_(2) high temperature heat pump drying system

作　　者：代宝民 王铭慧 刘圣春[2] 肖鹏 李伟锋 章立标 DAI Baomin;WANG Minghui;LIU Shengchun;XIAO Peng;LI Weifeng;ZHANG Libiao(Academy of Medical Engineering and Translational Medicine,Tianjin University,Tianjin 300072,China;Tianjin Key Laboratory of Refrigeration Technology,Tianjin University of Commerce,Tianjin 300134,China;Danhua Hongye Refrigeration Technology Co.,Ltd,Tianjin 300354,China;Zhejiang King Co.,Ltd.,Shaoxing 312300,China)

机构地区：[1]天津大学医学工程与转化医学研究院,天津300072 [2]天津商业大学天津市制冷技术重点实验室,天津300134 [3]天津市丹华宏业制冷技术有限公司,天津300131 [4]浙江国祥股份有限公司,浙江绍兴312300

出　　处：《热科学与技术》2024年第4期317-326,共10页Journal of Thermal Science and Technology

基　　金：中国博士后科学基金资助项目(2023M732582);国家自然科学基金资助项目(51806151);天津市自然科学基金资助项目(20JCQNJC0060);大学生创新创业训练计划资助项目(202110069067)

摘　　要：利用太阳能辅助热泵进行干燥应用是实现碳减排的有效手段。提出了太阳能辅助的跨临界CO_(2)高温热泵干燥系统,并对系统的热力学特性和全生命周期能耗及排放特性模型进行分析。结果表明跨临界CO_(2)高温热泵干燥系统在气体冷却器出现两个窄点时,取得最大COP及最优排气压力;跨临界CO_(2)高温热泵干燥系统COP随空气在气体冷却器出口处温度的降低显著提升,出口温度由120降低至70℃,COP提升了6.32%~31.45%。相对跨临界CO_(2)干燥系统和蒸汽辅助跨临界CO_(2)干燥系统,太阳能+蒸汽辅助蒸汽辅助跨临界CO_(2)干燥系统的全生命周期一次能源消耗和碳排放量最低,分别为2 505.99 t(标准煤当量)和5 411.96 t;相比蒸汽辅助跨临界CO_(2)干燥系统,太阳能+蒸汽辅助跨临界CO_(2)高温热泵干燥系统在使用天然气作为锅炉燃料时,气体污染物(SO_(2)和NO_(x))和固体污染物(PM_(2.5)和PM_(10))的排放量减少了40.49%。研究结果为高效低排放高温热泵干燥系统的构建和运行提供理论参考。Utilizing solar energy assisting heat pump for drying is an effective solution to achieve carbon emission reduction. A solar assisting transcritical CO_(2) high temperature heat pump drying system is proposed, and the thermodynamic, life cycle energy consumption and emission performances of the system are analyzed. The results show the transcritical CO_(2) high temperature heat pump drying system achieves the maximum coefficient of performance(COP) and the optimum discharge pressure when two pinch points are achieved in the gas cooler. The COP of the system increases significantly with the decrease of air temperature at the outlet of the gas cooler. The COP increases by 26.32%~31.45% as the outlet temperature decreasing from 120 to 70 ℃. Compared with transcritical CO_(2) drying system and steam assisting transcritical CO_(2) drying system, solar energy coupled with steam assising transcritical CO_(2) drying system operates with the lowest primary energy consumption and carbon emission throughout the whole life time, which are 2 505.99 t(standard coal equivalent) and 5 411.96 t, respectively. Compared with the steam assisting transcritical CO_(2) drying system, the emissions of gas pollutants(SO_(2) and NO_(x)) and solid pollutants(PM_(2.5) and PM_(10)) are reduced by 40.49% when the solar coupled with steam assisting transcritical CO_(2) high temperature heat pump drying system takes natural gas as the fuel of boiler. This study can provide a theoretical reference for the development and operation of efficient high temperature heat pump drying system with low emissions.

关 键 词：太阳能 二氧化碳 热泵系统 干燥 全生命周期 碳排放 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]