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燕山石化71×104t/a乙烯装置SRT-Ⅳ型裂解炉(BA-1101)经过历次改造后,出现炉膛负压升高和投用轻烃原料时排烟温度高的问题。针对燃烧器的改造、增设空气预热器、对流段腐蚀和风机能力这四种因素进行分析得出,裂解炉炉膛负压高的原因主要是风机能力有限,对流段和空气预热器积灰严重所致。通过清洗空气预热器,更换对流段换热管排形式,此问题得以解决。分析认为,影响裂解炉排烟温度的因素为炉膛负压、排烟氧含量、底部和侧壁燃料的匹配和裂解炉负荷。根据分析结果调整裂解炉操作,裂解炉炉膛负压提高至-20Pa,烟气氧含量降至1.1%~1.5%,侧壁和底部燃料配比为23∶77时排烟温度降低,当裂解炉负荷超过设计值时,排烟温度明显升高。通过优化裂解炉运行,燃料用量从3511m3/h(标准)降至3385m3/h(标准),排烟温度从135℃降至122℃,裂解炉热效率从92.9%提高到93.9%。
Yanshan Petrochemical 71 × 104t / a ethylene plant SRT-Ⅳ cracking furnace (BA-1101) After the transformation of the past, the emergence of the furnace negative pressure and the use of light hydrocarbon feedstock high temperature exhaust problems. According to the analysis of the burner retrofit, additional air preheater, convection section corrosion and fan capacity, it is concluded that the main reason for the high negative pressure in the hearth of the cracking furnace is the limited capacity of the fan, the fouling of the convection section and the air preheater Seriously caused. This problem can be solved by cleaning the air preheater and changing the convection section heat exchange tube row. Analysis, the factors that affect the cracking furnace exhaust temperature for the furnace negative pressure, exhaust oxygen content, bottom and sidewall fuel matching and cracking furnace load. According to the results of the analysis, the operation of the cracking furnace was adjusted. The negative pressure in the hearth of the cracking furnace increased to -20Pa, the oxygen content in the flue gas decreased to 1.1% -1.5%, and the exhaust gas temperature decreased when the ratio of side wall and bottom fuel was 23:77. When the load exceeds the design value, the exhaust gas temperature rises obviously. By optimizing the operation of the cracking furnace, the fuel consumption dropped from 3511m3 / h (standard) to 3385m3 / h (standard), the temperature of the exhaust gas dropped from 135 ° C to 122 ° C, and the cracking furnace thermal efficiency increased from 92.9% to 93.9%.