燃煤电站清洁高效协同的烟气余热深度利用优化系统

An Optimized System for Clean,Efficient and Deep Utilization of Flue Gas Waste Heat from Coal-fired Power Plants

提出应用氟塑料换热器技术,在电站锅炉尾部烟道中同时串联布置2级水媒式烟气加热器(MGGH)与2级低温省煤器,形成清洁高效协同的烟气余热深度利用优化系统;通过热力性能分析与技术经济学分析,详细研究了优化系统的优势.结果表明:与前置MGGH方案和后置MGGH方案相比,优化系统针对烟气余热进行了充分的梯级利用,有很好的节能效果,同时由于各换热器温差设计较为合理,可将换热器面积控制在较小的合理范围内,投资成本较低,具有良好的经济效益.

For clean, efficient and deep utilization of flue gas waste heat from coal-fired power plants, an optimized system based on fluoroplastic heat exchanger technology was proposed, which is composed of two-stage MGGHs and two-stage low-temperature economizers. By thermal performance and teehno-eco- nomic analysis, advantages of the optimized system were analyzed. Results show that, compared with both the pre-positioned and post-positioned MGGH system, the optimized system previously proposed presents great energy-saving effects and perfectly realizes the cascade utilization of the flue gas waste heat. In terms of economic performance, the proposed system has great benefit while low investment cost since the heat transfer temperature difference and heat exchange area of the heat exchanger are controlled in a rational range.