摘要
中国石油化工股份有限公司北京燕山分公司制氢装置余热回收系统运行异常,过热蒸汽温度由420℃下降至375℃、烟气排放温度升高到264℃,影响装置安全运行。检查、核算发现余热锅炉入口烟气量低于设计值、过热蒸汽管积垢,同时锅炉管束与炉墙衬里之间有间隙,空气预热器的入口温度分布不均,热管失效。为解决上述问题,将过热蒸汽段受热面积增加;在解吸气返回线上增设增强型过滤器;在烟气余热锅炉各段管束与炉墙的间隙处增加烟道挡板,并且更换前10排热管为耐高温热管。改造后,实现了装置长周期平稳运行,装置过热蒸汽温度由375℃提高到430℃、发汽量由91 t/h提高到95 t/h,有效保障了下游装置的用汽要求,改造后进、出空气预热器的烟气温度实现均匀分布,排烟温度降至125℃的正常水平。余热回收系统的运行更加优化,加热炉的热效率提高,取得较好的经济效益。
The operation of waste heat recovery system of the hydrogen generation plant of SINOPEC Yanshan Company was abnormal, the temperature of superheated steam went down from 420 ℃ to 375 ℃, the emission temperature of flue gas gradually rose up to 264 ℃, which affected the safe operation of the plant. The inspection and calculation found that the amount of flue gas at the inlet of waste heat boiler was lower than design and the fouling was deposited on the superheated steam tubes. At the same time, since spacing existed between boiler tube bundle and boiler wall lining, the distribution of inlet temperature of air preheater was uneven, leading to failure of heating tubes. To solve the these problems, the heat transfer area of superheated section was increased, enhancement type filter was installed on return line of the desorbed gas, the flue gas damper is provided at the spacing between each tube bundle and boiler wall of flue gas waste heat boiler, and heat tubes of the first 10 front rows were replaced with high temperature-resistance heat tubes. Through the above-mentioned modifications, the longterm and stable operation of the plant has been realized, superheated steam temperature rose up from 375℃ to 430 ℃ and amount of steam production of the plant increased from 91 t/h to 95 t/h and the steam consumption required by downstream plants was effectively ensured, After revamping, the temperature of flue gas entering and exiting air preheater is obviously distributed evenly, and exhaust temperature of flue gas returned to normal. Since the operation of waste heat recovery system is more optimized, the heat efficiency of the heater is increased and good economic benefit is obtained.
出处
《炼油技术与工程》
CAS
2014年第3期57-60,共4页
Petroleum Refinery Engineering
关键词
制氢装置
转化炉
余热回收系统
对策
hydrogen generation plant, reformer, waste heat recovery system, countermeasures
作者简介
于会泳，高级工程师，1998年毕业于石油大学（华东）化学工程专业，现从事丁艺技术管理工作。联系电话：010—80342536；E—mail：yuhuiyong．yssh@sinopec．com。
