摘要
火力发电厂中脱硫系统能耗较高,脱硫塔前烟气具有较大余热回收潜力,合理的脱硫塔入口烟气参数可提高脱硫性能并降低水耗。为此,文中提出了4种将烟气调温与余热回收进行耦合的系统方案,并计算了系统能耗、投资以及投入运行后机组的节煤量。在此基础上,结合能量汇入温差最小的?损分析原则,在保证高脱硫效率的前提下,提出了优化的分级烟气调温与余热回收方案,可将余热分别回收至机组第六、七级低加,能使系统?损百分比降低为1.05%,机组供电标准煤耗降低3.29g/(k W·h)。
The desulfurization system in thermal power plant has high energy consumption, and the flue gas in front of the desulfurization tower has great potential for recovery of waste heat. Reasonable flue gas parameters at the entrance of the desulfurization tower can improve desulfurization performance and reduce water consumption. In this paper, four coupling schemes of flue gas temperature regulation with waste heat recovery were proposed, and energy consumption, investment and coal saving of the unit were calculated. Combined with the principle of minimum exergy loss due to energy inflow temperature difference, an optimized graded flue gas conditioning and waste heat recovery scheme was proposed under the condition of ensuring high desulfurization efficiency. The waste heat could be recovered to the sixth and seventh low pressure heaters, which could reduce the percentage of exergy to 1.05%, and the standard coal consumption of generating units could be reduced by 3.29 g/(k W·h).
作者
邓庆波
冉景煜
杨仲卿
蒲舸
闫云飞
牛俊天
DENG Qingbo;RAN Jingyu;YANG Zhongqing;PU Ge;YAN Yunfei;NIU Juntian(Key Laboratory of Low-grade Energy Utilization Technologies and Systems(Chongqing University),Shapingba District,Chongqing 400044,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第23期7667-7674,共8页
Proceedings of the CSEE
基金
重庆市重点产业共性关键技术创新专项(cstc2016zdcy-ztzx20006)。
关键词
湿法脱硫
余热回收
烟气调温
[火用]损
节煤量
wet desulfurization
waste heat recovery
flue gas conditioning
exergy loss
coal saving
