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Thermodynamic analysis of solar energy integrated underground coal gasification in the context of cleaner fossil power generation

机译：化石发电清洁化背景下太阳能一体化地下煤气化的热力学分析

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Underground coal gasification (UCG) is an in-situ physico-chemical process for the conversion of deep coal resources into useful product gas. The UCG process is inherently a clean coal technology avoiding several difficulties of conventional coal mining process. However, it is a complex in-situ phenomenon depending on site-specific geological parameters. Energy loss occurs in a UCG process due to water influx, underground cavity pressure drop, gas loss to the surrounding strata and high temperature gasifying medium, which are major challenges of UCG operation. These losses can be compensated if UCG is integrated with solar energy, which is a renewable and a cleaner source of energy. In the present study, two types of low pressure UCG based power plants are conceptualised using solar energy - (i) a conventional steam turbine cycle consisting of a high pressure, a medium pressure and a low pressure turbine and (ii) a gas turbine cycle with supercritical carbon dioxide (sCO(2)) as a working fluid operating in a combined cycle power plant system. The scope of integration of solar power on the UCG based power plant systems is discussed for cleaner energy production. A detailed thermodynamic analysis is carried out to estimate the thermal efficiency of both cycles for cases with and without the integration of solar energy. A net thermal efficiency of the solar-UCG based steam turbine cycle is found as 28.2% with carbon capture and storage (CCS). The solar-UCG based sCO(2) gas turbine cycle shows a high net thermal efficiency of 32.9% with CCS, which is 4% higher than the respective system without having solar energy utilization. (C) 2015 Elsevier Ltd. All rights reserved.
机译：地下煤气化（UCG）是一种将深层煤炭资源转化为有用产品气的原位物理化学过程。 UCG工艺本质上是一种洁净煤技术，避免了常规煤矿开采工艺的若干困难。但是，这是一个复杂的原地现象，具体取决于特定地点的地质参数。由于水的涌入，地下空腔的压降，周围地层的气体损失和高温气化介质，在UCG过程中会发生能量损失，这是UCG运行的主要挑战。如果UCG与太阳能集成在一起，则可以弥补这些损失，太阳能是一种可再生的清洁能源。在本研究中，使用太阳能概念化了两种基于UCG的低压发电厂-（i）由高压，中压和低压涡轮组成的常规蒸汽轮机循环，以及（ii）燃气轮机循环超临界二氧化碳（sCO（2））作为在联合循环电厂系统中运行的工作流体。讨论了在基于UCG的发电厂系统上集成太阳能的范围，以生产清洁能源。进行了详细的热力学分析，以估计在有和没有集成太阳能的情况下两个循环的热效率。有了碳捕集与封存（CCS），基于太阳能-UCG的蒸汽轮机循环的净热效率为28.2％。基于太阳能-UCG的sCO（2）燃气轮机循环在CCS的情况下显示出32.9％的高净热效率，比不使用太阳能的相应系统高4％。 （C）2015 Elsevier Ltd.保留所有权利。

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