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Increasing the efficiency of high temperature furnaces through a topping cycle cogeneration—a case study

机译:通过顶循环热电联产提高高温炉的效率-一个案例研究

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Based on the energy requirements of a set of continuous metallurgic heat treatment furnaces, this paper describes and compares several energy efficiency and cogeneration scenarios in a Portuguese metallurgic plant in terms of operating costs vs. savings. Such scenarios are analyzed in terms of hourly and annual savings. As part of improved heat integration, an energy cascade was designed and several hypotheses were studied to better match the decreasing thermal requirements of various heat treatment furnaces, each with different set point temperature and operating times. The scenario which presents the highest primary energy and economic saving adopts a special kind of gas turbine, one that due to its own characteristics requires a larger amount of excess air, hence being capable of providing enough O2 for a post-combustion in the existing burners. This setting is essential so that the furnaces are able to reach the required set point temperatures. This solution, along with additional simple energy saving actions, accounted for primary energy savings of 7.9 %, a decrease in 5 % in carbon dioxide emissions and a reduction of the energy costs over 40 %.
机译:基于一组连续冶金热处理炉的能源需求,本文从运营成本与节约的角度描述并比较了葡萄牙冶金工厂的几种能源效率和热电联产方案。根据每小时和每年节省的成本来分析这种情况。作为改进的热集成的一部分,设计了一个能量级联,并研究了几种假设,以更好地满足各种热处理炉不断降低的热需求,每种热处理炉的设定温度和工作时间不同。一次能源和经济节省最高的方案采用一种特殊的燃气轮机,由于其自​​身的特性需要大量的过量空气,因此能够为现有燃烧器中的后燃烧提供足够的氧气。此设置至关重要,这样熔炉才能达到所需的设定点温度。该解决方案与其他简单的节能措施一起,节省了7.9%的一次能源,二氧化碳排放量减少了5%,能源成本降低了40%以上。

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