太阳能辅助燃煤机组碳捕集系统性能研究

发布时间：2018-01-01 00:03

本文关键词：太阳能辅助燃煤机组碳捕集系统性能研究　出处：《华北电力大学(北京)》2016年硕士论文　论文类型：学位论文

【摘要】：基于MEA溶液的燃烧后碳捕集方法是减轻温室效应的主要途径之一,然而该方法会消耗大量的汽轮机抽汽,造成燃煤机组系统效率的严重下降,将太阳能热量引入该系统可以在一定程度上弥补这种能量惩罚。本文提出了两种太阳能辅助燃煤机组碳捕集的系统集成方案,方案一为利用槽式太阳能集热场收集的热量来替代燃煤机组汽轮机的高压抽汽,被替代的抽汽在汽轮机中继续做功,用来弥补部分碳捕集单元的再生能耗；方案二是将槽式太阳能集热场收集的热量直接用来提供碳捕集单元MEA富液再生所需的能耗,不足部分由汽轮机抽汽提供。此外,本文利用燃煤机组碳捕集系统作为参比系统与这两种方案进行对比分析。本文利用Aspen Plus软件对基于MEA的燃烧后碳捕集系统进行模拟,利用Ebsilon Professional软件对燃煤机组以及太阳能集热场进行模拟,通过主要数据的传递实现模型的对接,分别搭建太阳能辅助碳捕集系统方案一、方案二以及参比系统的热力系统模型。在此基础上,分别计算了三个系统的热力性能指标(热效率、煤耗率、光电转换效率)以及经济性能指标(发电成本、CO2规避成本),进行对比分析。此外,本文基于(?)分析理论,分别计算太阳能辅助燃煤机组碳捕集系统方案一、方案二以及参比系统中各设备的(?)效率,找出(?)效率较低的设备,分析原因并提出改进方案。结果表明：(1)对燃煤机组采取碳捕集措施之后,系统总功率下降了160.50MW。采用方案一可以补偿57.17MW的功率,采用方案二可以补偿39MW的功率。(2)太阳能辅助燃煤机组碳捕集系统方案一比方案二输出功率多18.17MW;光电转换效率高出10.82%；煤耗率低6.19 g/kWh；COE低0.47$/MWh;CO2规避成本低0.7$/tCO2；而系统热效率低0.57个百分点。总体上来说,方案一要优于方案二。(3)太阳能集热场和锅炉是系统中(?)效率比较低的设备。而且方案一的锅炉(?)效率高于方案二和参比系统,方案一的太阳能集热场效率高于方案二。
[Abstract]:MEA solution based carbon capture method after combustion is one of the main ways to reduce Greenhouse Effect, however, this method will consume a lot of steam turbine extraction, resulting in a serious decline in system efficiency of coal-fired units. Introducing solar energy heat into the system can compensate for this energy penalty to a certain extent. In this paper, two kinds of solar assisted coal-fired unit carbon capture system integration scheme is proposed. The first scheme is to use the heat collected from the trough solar energy collector field to replace the high-pressure extraction steam of the coal-fired unit steam turbine, and the replaced extraction steam will continue to work in the steam turbine to compensate for the regeneration energy consumption of some carbon capture units. The second scheme is to directly use the heat collected from the trough solar energy collection field to provide the energy consumption needed for MEA rich regeneration of carbon capture unit, and the insufficient part is provided by steam extraction of steam turbine. In this paper, the carbon capture system of coal-fired units is used as a reference system to compare and analyze the two schemes. The Aspen Plus software is used to simulate the post-combustion carbon capture system based on MEA. Ebsilon Professional software is used to simulate the thermal field of coal-fired units and solar energy, and the model docking is realized through the transfer of main data. The thermodynamic system models of solar-assisted carbon capture system scheme 1, scheme 2 and reference system are built, and the thermal performance indexes (thermal efficiency, coal consumption rate) of the three systems are calculated respectively. Photoelectric conversion efficiency) and economic performance index (generation cost, CO _ 2 circumvention cost, comparative analysis). In addition, this paper based on? Analysis theory, respectively calculate the solar assisted coal-fired unit carbon capture system scheme 1, scheme 2 and the reference system of the equipment? (efficiency, find out? For the inefficient equipment, the causes are analyzed and the improvement scheme is put forward. The result shows that the carbon capture measures are adopted for the coal-fired units. The total power of the system is reduced by 160.50MW. The first scheme can compensate 57.17MW power. The second scheme can compensate 39MW power. (2) the carbon capture system of solar auxiliary coal-fired unit is 18.17MW more than that of the second scheme. The efficiency of photoelectric conversion is higher than that of 10.82; The coal consumption rate is 6.19 g / kWh; COE was 0.47% lower than MWh; The cost of CO2 avoidance is 0.7 / t CO _ 2; The thermal efficiency of the system is 0.57 percentage points lower. Overall, the first scheme is better than the second one. 3) the solar energy collecting field and boiler are in the system. ) inefficient equipment. And scheme one boiler? The efficiency of scheme 1 is higher than that of scheme 2 and reference system, and the efficiency of solar energy field of scheme 1 is higher than that of scheme 2.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM621;TM615

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