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Upgrading existing gas-steam combined cycle power plants through steam injection and methane steam reforming

机译：通过注汽和甲烷蒸汽重整升级现有的燃气-蒸汽联合循环发电厂

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The growth in worldwide energy demand currently faces the difficulty of installing new power generation facilities due to limited funding and the strengthening of environmental regulations. Owing to the increasing role of natural gas combined cycles (NGCCs) in the power generation infrastructure, it is important to assess the energy and economic feasibility of upgrading their capacity to cope with future energy requirements.This study aims to investigate a new concept for upgrading existing NGCCs by integrating an additional unit based on gas turbine. The additional unit allows the production of steam to be injected into the NGCC combustor (Option A) or syngas from methane steam reforming to be fed into the existing power plant (Option B) or even into the additional gas turbine (Option C). The power output augmentation arises from the capacity of the additional gas turbine and the increase in power production of both gas cycle and bottoming steam section of the NGCC. A preliminary sensitivity analysis assesses the influence of operating conditions of the additional unit on the energy and economic performances of marginal power production. Considering commercial gas turbines, further investigations address the design of upgrading options and the comparison of their techno-economic performances referred to the additional or the overall power productions. Finally, focusing on Option A, the part-load operation of the additional gas turbine is examined to evaluate penalties on marginal efficiency and marginal cost of electricity. Simulation results revealed that for a power augmentation lower than 50%, Option A provides the best economic performance combined with the highest operational simplicity, while Option C is the preferred technical solution for a greater increase in plant capacity. (C) 2019 Elsevier Ltd. All rights reserved.
机译：由于有限的资金和加强的环境法规，目前全球能源需求的增长面临着安装新发电设备的困难。由于天然气联合循环（NGCC）在发电基础设施中的作用日益重要，因此评估提升其能力以应对未来能源需求的能源和经济可行性非常重要。本研究旨在研究一种新的升级概念通过集成基于燃气轮机的附加单元来实现现有的NGCC。附加单元允许将产生的蒸汽注入NGCC燃烧器（选项A），或将甲烷蒸汽重整生成的合成气注入现有的发电厂（选项B），甚至送入附加的燃气轮机（选项C）。功率输出的增加源自附加燃气轮机的容量以及NGCC的燃气循环和底部蒸汽部分的发电量增加。初步的敏感性分析评估了附加机组的运行条件对边际电力生产的能源和经济绩效的影响。考虑到商用燃气轮机，需要进行进一步的研究，以研究升级方案的设计，并将其技术经济性能进行比较，以涉及额外的或整体发电量。最后，针对方案A，检查了附加燃气轮机的部分负荷运行情况，以评估边际效率和边际电力成本的损失。仿真结果表明，对于低于50％的功率增加，选项A提供了最佳的经济性能以及最高的操作简便性，而选项C是更大提高工厂产能的首选技术解决方案。 （C）2019 Elsevier Ltd.保留所有权利。

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