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Performance evaluation of honeycomb shaped sorbent for sulfur removal in advanced oxy-fuel IGCC power generation plant

机译:蜂窝状吸附剂在含氧燃料IGCC电厂中脱硫的性能评估

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Oxy fuel IGCC is one of the promising option for reconciling environment and efficiency in power generation from coal that is expected to achieve thermal efficiency of 44% LHV and 99% of CO2 capturing ratio. Dry syngas cleaning technologies for halide and sulfur are essential for realizing the power plant. The dry desulfurization process will use honeycomb shaped sorbent in fixed bed reactors in actual plant. In this study, comparative evaluation was performed on two kinds of the sorbent with and without improvement on durability to the harmful carbon deposition. The effect of gas composition on the sorbent performance was evaluated at 450 degrees C and 0.98 MPa abs. When the severe condition for carbon deposition was applied to the sorbent without improvement, crucial carbon deposition occurred rapidly in the honeycomb sorbent. Thus, the deposited carbon caused collapse of sorbent structure and deterioration of sulfur removal performance. Once the deposited carbon accumulated to the sorbent, it could not be eliminated in the subsequent regeneration procedure. On the contrary, the improved sorbent was durable to carbon deposition even under the severe condition, so that sorbent structure and sulfur removal performance was retained. Thus, it is essential to avoid the rapid carbon deposition by enhancing sorbent durability to the carbon deposition and providing gas condition for retarding the harmful side reaction. The amount of deposited carbon did not exceed 1.0 wt% even at the severe condition. The sorbent could exhibit sufficient sulfur removal performance for the first and second cycle desulfurization at the severe condition as well as at the gentle condition. These results confirmed that the sorbent has higher potential to be safely used in start-up condition as well as ordinary condition of expected dry sulfur removal process of oxy-fuel IGCC plant. (C) 2017 Elsevier Ltd. All rights reserved.
机译:含氧燃料IGCC是兼顾环境与煤炭发电效率的有前途的选择之一,有望实现44%LHV的热效率和99%CO2捕集率的热效率。卤化物和硫磺的干法合成气清洁技术对于实现电厂至关重要。干法脱硫工艺将在实际工厂的固定床反应器中使用蜂窝状吸附剂。在这项研究中,对两种吸附剂进行了比较评估,无论是否改善了对有害碳沉积的持久性。在450摄氏度和0.98 MPa绝对压力下评估了气体成分对吸附剂性能的影响。当在没有改善的情况下将苛刻的碳沉积条件应用于吸附剂时,蜂窝状吸附剂中会迅速发生关键的碳沉积。因此,沉积的碳引起吸附剂结构的破坏和脱硫性能的降低。一旦沉积的碳积聚到吸附剂中,就无法在随后的再生程序中消除它。相反,改进的吸附剂即使在严酷的条件下也对碳沉积具有持久性,从而保留了吸附剂的结构和脱硫性能。因此,重要的是通过增强吸附剂对碳沉积的耐久性并提供用于阻止有害副反应的气体条件来避免快速的碳沉积。即使在严酷的条件下,碳的沉积量也不超过1.0重量%。该吸附剂在严酷条件下和温和条件下对于第一和第二循环脱硫均具有足够的脱硫性能。这些结果证实了该吸附剂具有较高的潜力,可以在氧气燃料IGCC工厂预期的干法脱硫工艺的启动条件以及普通条件下安全使用。 (C)2017 Elsevier Ltd.保留所有权利。

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