摘要
针对选择性催化还原脱硝系统尿素热解制氨工艺能耗大、运行费高问题,总结提出以烟气换热器技术或尿素溶液直喷技术取代天然气/柴油燃烧器或电加热器技术,在不降低系统可靠性前提下,极大降低了脱硝还原剂制备系统运行费用。理论分析及实际改造工程性能测试数据表明,此改造项目节能效益巨大,具有可观的经济价值、环保价值。但是尿素溶液直喷技术目前无法解决氨气与烟气混合难度大、混合气体烟尘浓度高等难点,而烟气换热器技术在可靠性、成熟度方面更具优势,前者有待进一步发展。若相关电厂计划进行尿素热解脱硝技术的节能改造,须根据机组设备、场地、煤质等具体因素进行分析、计算,选择最佳的节能改造技术路线。
In allusion to problems of ammonia production process by urea pyrolysis of the selective catalytic reduction(SCR)system such as large energy consumption and high operating expenses,this paper presents to replace technologies of natural gas/diesel burner or electric heater by gas-gas heater technology or urea solution direct-injection technology which can greatly reduce operating expenses of the denitration reductant preparation system in the premise of maintaining reliability of the system.Performance test data of theoretical analysis and actual transformation engineering indicate this transformation project is of large energy saving benefit and has considerable economic and environmental protection values.But the urea solution direct-injection technology can t solve difficulties of mixture of ammonia and gas as well as high dust concentration of the mixed gas,while the gas-gas heater technology has advantages in reliability and maturity,the former needs to be developed.If some power plants are to carry out energy saving transformation for ammonia production process by urea pyrolysis,these specific factors including unit equipment,sites,coal qualities and so on are necessary to be taken into consideration for analysis and calculation so as to select out the optimal technical transformation route.
作者
李二欣
王特
韦飞
LI Erxin;WANG Te;Wei Fei(State Power Environmental Protection Research Institute,Nanjing,Jiangsu 210031,China)
出处
《广东电力》
2018年第3期27-31,共5页
Guangdong Electric Power
