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首页> 外文期刊>Energy Equipment and Systems >Conceptual design of a super-critical CO2 brayton cycle based on stack waste heat recovery for shazand power plant in Iran
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Conceptual design of a super-critical CO2 brayton cycle based on stack waste heat recovery for shazand power plant in Iran

机译：基于烟囱余热回收的伊朗shazand电厂超临界CO2布雷顿循环概念设计

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Conceptual design of a waste heat recovery cycle is carried out in attempt to enhance the thermal efficiency of a steam power plant. In the recovery system, super-critical an CO2 is employed as the working fluid operating in a Brayton cycle. Low grade heat rejected by the flue gases through the stack is used as the primary heat source, while a secondary heat exchanger utilizes the hot gases leaving the economizer to heat of CO2 up to desired temperature. In the present work, a case study for a 325 MW steam power plant of Shazand in Iran is carried out and a thermodynamic model is developed to predict the performance of the system. Regarding that the proposed recovery cycle may lead to less effective air preheating and affecting the combustion efficiency, an optimization process has been conducted to determine the optimum conditions. It’s been also considered that excessive decline in flue gas temperature leaving the stack may result in the condensation and accumulation of corrosive substances on the inner surface of the stack. The results demonstrate that this waste heat recovery system can deliver up to 18 MW of net power which corresponds to an increase of 1.58 percent in thermal efficiency of the power plant. Obtained results magnify the importance of this innovative design, consequently illustrate the necessity for using waste heat recovery system.
机译：进行废热回收循环的概念设计，试图提高蒸汽发电厂的热效率。在回收系统中，采用超临界CO2作为布雷顿循环中的工作流体。烟道气通过烟囱排出的低级热量用作主要热源，而二级热交换器则利用离开节约器的热气将CO2加热到所需温度。在当前工作中，对伊朗Shazand的325 MW蒸汽发电厂进行了案例研究，并开发了一个热力学模型来预测系统的性能。关于提议的回收周期可能导致不太有效的空气预热并影响燃烧效率，已进行了优化过程以确定最佳条件。人们还认为，离开烟囱的烟道气温度过度下降可能会导致腐蚀物质在烟囱的内表面凝结和积聚。结果表明，该废热回收系统可提供高达18 MW的净功率，相当于电厂热效率提高1.58％。获得的结果放大了这种创新设计的重要性，因此说明了使用废热回收系统的必要性。

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