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首页> 外文期刊>Energy & fuels >Recovery of Flue Gas Energy in Heat-Integrated Gasification Combined Cycle (IGCC) Power Plants Using the Contact Economizer System
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Recovery of Flue Gas Energy in Heat-Integrated Gasification Combined Cycle (IGCC) Power Plants Using the Contact Economizer System

机译：使用接触节能器系统的热集成气化联合循环（IGCC）发电厂的烟气能量回收

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摘要

Recovery of low potential energy of flue gases, mainly from industrial boilers, has become one of the problems of interest in research. In this work, the contact economizer system is used to recover low potential heat from the gas turbine exhaust (flue gas) stream of a heat-integrated gasification combined cycle (IGCC) design of the Elcogas plant adopted from previous studies. The underlying support for this idea was the direct relationship between efficiency of the IGCC and the boiler feedwater temperature. Recovery of the flue gas heat to preheat the boiler feedwater was demonstrated to be capable of further increasing the thermal efficiency of the plant The methodology developed is divided into two parts, i.e., determining the maximum boiler feedwater temperature attainable and applying Mickley's graphical technique for dehumidification, following a slightly different procedure that allows for the calculation of the exact ratio between the liquid-phase heat-transfer coefficient and the gas-phase mass-transfer coefficient, to demonstrate how the aforementioned temperature is achieved. The grand composite curve is used to check whether the determined boiler feedwater temperature is feasible. A case study on the Elcogas plant illustrated that the developed method is capable of increasing the gross efficiency from 54 to 55%. This increase in efficiency, however, has a penalty of operating at higher boiler and heat recovery steam generator (HRSG) pressures.
机译：主要从工业锅炉回收烟道气的低势能已成为研究中关注的问题之一。在这项工作中，接触节能器系统用于从先前研究中采用的Elcogas工厂的热集成气化联合循环（IGCC）设计中，从燃气轮机废气流中回收低位热量。该想法的基本支持是IGCC效率与锅炉给水温度之间的直接关系。事实证明，回收烟气热量以预热锅炉给水能够进一步提高设备的热效率。所开发的方法分为两部分，即确定可达到的锅炉给水最高温度，并使用米克利的图形技术进行除湿遵循略有不同的程序，该程序可以计算出液相传热系数与气相传质系数之间的确切比值，以说明如何实现上述温度。大复合曲线用于检查确定的锅炉给水温度是否可行。在Elcogas工厂进行的案例研究表明，开发的方法能够将总效率从54％提高到55％。然而，效率的提高不利于在更高的锅炉和热回收蒸汽发生器（HRSG）压力下运行。

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