烟气脱硝尿素单元制与公用制水解工艺技术比较

Comparison of Unit and Public Urea Hydrolysis Process Technology for Flue Gas Denitrification

结合具体工程实例,采用调查、个案研究与经验总结相结合的研究方法,比较了烟气脱硝尿素单元制与公用制这2种布置方式的安全性和空间适应性。与单元制布置方式相比,公用制布置的主要优势体现在:水解反应器互为备用,系统更安全可靠;主管道以输送氨气为主,降低了管道堵塞的可能;更能适应入口氮氧化物浓度波动;空间布置更灵活紧凑;锅炉台数越多,公用制布置方式优势越明显。对于负荷率不高、氮氧化物浓度波动较大,且位于寒冷地区的电厂,建议优先考虑公用制尿素水解布置方式。

Combined with specific project examples, the safety reliability and space adaptability of the public urea hydrolysis technology for flue gas denitrification were compared with that of the unit system urea hydrolysis technology, as well as their arrangements, through the research methods of surveys, case studies and lessons. And compared with the unit system configuration, the main advantages of the public system are embodied in the following aspects ： the public system is safer and more reliable because of the mutual standby for the hydrolysis reactor; the main pipeline based on transporting ammonia, reduces the possibility of the blockage of the pipeline; which can adapt to the concentration fluctuation of inlet NOx; the space layout is more flexible and compact; more boilers, more advantages can be taken by the public system. The public layout of urea hydrolysis system is recommended priority for the condition that the loading rate is not high, the concentration of nitrogen oxides fluctuations high and the power plant locates in cold regions.