Output power analyses for the thermodynamic cycles of thermal power plants

Thermal power plant is one of the important thermodynamic devices, which is very common in all kinds of power generation systems. In this paper, we use a new concept, entransy loss, as well as exergy destruction, to analyze the single reheating Rankine cycle unit and the single stage steam extraction regenerative Rankine cycle unit in power plants. This is the first time that the concept of entransy loss is applied to the analysis of the power plant Rankine cycles with reheating and steam extraction regeneration. In order to obtain the maximum output power, the operating conditions under variant vapor mass flow rates are optimized numerically, as well as the combustion temperatures and the off-design flow rates of the flue gas. The relationship between the output power and the exergy destruction rate and that between the output power and the entransy loss rate are discussed. It is found that both the minimum exergy destruction rate and the maximum entransy loss rate lead to the maximum output power when the combustion temperature and heat capacity flow rate of the flue gas are prescribed. Unlike the minimum exergy destruction rate, the maximum entransy loss rate is related to the maximum output power when the highest temperature and heat capacity flow rate of the flue gas are not prescribed.     

高压密封消解技术在电厂盐垢分析中的应用

利用高压密封消解技术来消解蒸汽汽轮机叶片上的盐垢,确定了理想的消解体系及消解条件,能比较方便,快捷地完全消解盐垢,并对消解后的元素分析测定作了相应的研究,结果令人满意,本法的SiO2和Fe^3 的标准加入回收率分别为95％－101％和97％－108％。     

催化动力学光度法测定发电厂炉水中微量氯离子

氯离子会造成金属组织的晶间裂纹与脆性破裂,火力发电厂水蒸气循环中氯离子的浓度尽管不是很高,但由于氯离子不断浓缩,其含量很容易达到腐蚀金属的程度,火力发电厂热力设备等水蒸气系统中氯离子监测的研究意义重大。目前,测定微量氯离子常采用仪器分析方法[1-4],但仪器昂贵,操作复杂。试验发现,在硫酸介质和邻二氮菲存在时,痕