为充分利用生物质资源,提出了与燃煤机组和超临界二氧化碳循环的生物质气化系统概念,该系统的生物质气化利用过程与燃煤机组及超临界二氧化碳循环的高度耦合。合成气经二氧化碳冷却后,经净化后送入燃气轮机燃烧。烟气经燃气轮机,超临界二氧化碳循环,锅炉给水逐步回收热量,提升了生物质的利用率,进而提高了发电效率。以660MW燃煤机组和16t/h生物质气化炉为例,通过对系统仿真,对其进行了热力学和经济性分析。结果表明,所提出的耦合系统引入了46.66MW的生物质能,额外发出了21.09MW功率,生物质能效率可达45.20%,效率可达41.67%,可充分利用生物质中能量。系统净现值约40468万元,且约需2.94a即可收回成本,具有良好的经济效益。

In order to fully utilize the biomass resources, a concept of biomass gasification system with coal-fired power plant and supercritical CO2 cycle was presented. The biomass gasification utilization process of this system is highly coupled with coal-fired power plantand supercritical CO2 cycle. After being cooled by carbon dioxide, the syngas is purified and fed to the gas turbine for combustion. Theheat in the flue gas is gradually recovered through the gas turbine, supercritical CO2 cycle and coal-fired power plant feedwater, enhancing the utilization and thus improving the efficiency. Taking a 660 MW coal-fired unit and a 16 t/ h biomass gasification furnace as examples, thermodynamic and economic analysis was conducted through system simulation. The results show that the proposed coupled systemintroduces 46.66 MW of biomass energy and generates an additional 21.09 MW of power, and the efficiency of biomass-to-electric energy can reach up to 45.20% and the exergy efficiency can reach 41.67%, which fully utilizes the energy in the biomass. The net presentvalue of the system is about 404.68 million yuan, and it only takes about 2.94 years to recover the investment, which shows the good economic performance of the system.

0 引言

1 系统描述

2 系统模拟

   2.1 热力系统建模

   2.2 系统参数

3 分析方法

   3.1 能量分析

   3.2 㶲分析

   3.3 经济性分析

4 结果与讨论

   4.1 耦合系统的参数

   4.2 能量分析结果

   4.3 㶲分析结果

   4.4 经济性分析结果

5 结论