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从热力学第二定律出发,应用熵产理论分析锅炉受热面的各项不可逆损失,建立锅炉受热面的传热熵产模型、流阻熵产模型、传质熵产模型、吹灰介质熵产模型、电机熵产模型,进而建立比熵产计算模型。以某电厂一台600MW锅炉为实例研究对象,采集现场DCS数据,计算各项比熵产和对应单次单位传热量的吹灰净收益,计算结果表明比传热熵产在各项比熵产中占的比重最大,各个受热面的吹灰净收益差别很大,进而提出了采用比熵产更加有利于优化吹灰系统。
Based on the second law of thermodynamics, the entropy production theory is used to analyze the irreversible losses of the heating surface of the boiler. The heat transfer entropy production model, the flow resistance entropy production model, the mass transfer entropy production model and the soot blowing medium entropy production model , Motor entropy production model, and then build a specific entropy production model. Taking a 600 MW boiler in a power plant as an example, the on-site DCS data were collected and the net benefits of the blow-ash for each specific entropy production and the corresponding heat transfer per unit were calculated. The results show that the specific heat transfer entropy yield Accounting for the largest proportion of each heated surface blowing the net benefits vary widely, and then put forward the use of specific entropy production is more conducive to the optimization of the system of blowing.