煤分级利用多联产技术及其发展前景

20世纪末期以来，面对我国一次能源以煤为主、能源需求日益增长以及世界环境恶化的现实，构建资源、能源、环境整体化的可持续发展能源系统是我国能源战略方向。煤分级利用多联产系统是实现整体最优、跨越行业的资源、能源、环境一体化系统。本文介绍了煤多联产技术的主要技术类型，包括煤热解气化为核心的多联产技术、煤部分气化为核心的多联产技术及煤完全气化为核心的多联产技术。重点介绍了煤热解气化为核心的热电气焦油多联产技术，详细阐述了该多联产装置的工艺流程和运行特性。最后，基于煤分级利用联合循环发电系统，从节能减排等方面对多联产技术的发展前景进行了展望，指出用煤分级利用联合循环发电系统来改造老电厂，可以提高现有电厂运行经济性及节能特性。

Development and prospect of coal staged conversion poly-generation technology

Since the last decade of the 20th century，due to the coal-dominated energy structure，increasing energy demand and the environment problems in China，building resources，energy，environment integrated and sustainable development energy system is the direction of China’s energy strategy. Coal staged conversion poly-generation system，integrating resources，energy，and environment realizes overall optimality. The main three poly-generation technologies，including coal pyrolysis and combustion poly-generation technology，coal partial gasification poly-generation technology and coal gasification poly-generation technology，are presented in this paper. A steam，electricity，coal gas and tar poly-generation technology is introduced，including detailed process of the poly-generation system and operating characteristics. Finally，based on the combined cycle poly-generation system，the energy-conservation and emission-reduction of the system are evaluated. The result shows that the power plant using coal staged conversion combined cycle poly-generation，is much more economical and energy-conserving than the traditional power plant.