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SYSTEM STUDY ON PARTIAL GASIFICATION COMBINED CYCLE WITH CO_2 RECOVERY

机译：用CO_2恢复部分气化联合循环的系统研究

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A partial gasification combined cycle with CO_2 recovery is proposed in this paper. Partial gasification adopts cascade conversion of the composition of coal. Active composition of coal is simply gasified, while inactive composition, that is char, is burnt in a boiler. Oxy-fuel combustion of syngas produces only CO_2 and H_2O, so the CO_2 can be separated through cooling the working fluid. This decreases the amount of energy consumed to separate CO_2 compared with conventional methods. The novel system integrates the above two key technologies, by injecting steam from a steam turbine into the combustion chamber of a gas turbine, to combine the Rankine cycle with the Brayton cycle. The thermal efficiency of this system will be higher based on the cascade utilization of energy level. Compared to the conventional IGCC, the compressor of the gas turbine, HRSG and gasifier are substituted for a pump, reheater and partial gasifier, so the system is simplified obviously. Furthermore, the novel system is investigated by means of EUD (Energy-Utilization Diagram) methodology and provides a simple analysis of their economic and environmental performance. As a result, the thermal efficiency of this system may be expected to be 46%, with recovery of 50% of CO_2, which is 3-5% higher than that of an IGCC system. At the same time, the total investment cost of the new system is about 21.5% lower than that of an IGCC. The promising results obtained here with higher thermal efficiency, lower cost and less environmental impact provide an attractive option for clean coal utilization technology.
机译：本文提出了具有CO_2回收的部分气化联合循环。部分气化采用煤炭组成的级联转化。煤炭的活性组成简单地气化，而非活性组合物，即炭，在锅炉中燃烧。合成气的氧燃料燃烧仅产生CO_2和H_2O，因此CO_2可以通过冷却工作流体来分离。与常规方法相比，这降低了将CO_2分离的能量的量。新颖系统通过将蒸汽从蒸汽涡轮机注入燃气轮机的燃烧室中的蒸汽来集成上述两个关键技术，以将朗肯循环与布拉顿循环结合起来。基于级联利用能量水平，该系统的热效率将更高。与传统的IGCC相比，燃气轮机，HRSG和气化器的压缩机被泵，再热器和部分气化器代替，因此系统明显简化。此外，通过EUD（能量利用图）方法研究了新型系统，并对其经济和环境绩效进行了简单的分析。结果，该系统的热效率可能预期为46％，恢复为50％的CO_2，比IGCC系统高3-5％。与此同时，新系统的总投资成本约为21.5％，低于IGCC。这里获得的有希望的结果具有更高的热效率，降低成本和更少的环境影响，为清洁煤利用技术提供了一种有吸引力的选择。

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