理论配比燃烧控制方案在PX装置加热炉上的应用  

Application of stoichiometric combustion control program in heating furnace of PX unit

作　　者：王金龙[1] 

机构地区：[1]中国石油化工股份有限公司镇海炼化分公司,浙江省宁波市315207

出　　处：《炼油技术与工程》2015年第10期35-39,共5页Petroleum Refinery Engineering

摘　　要：针对某炼化公司PX装置加热炉原有燃烧控制方案存在控制精度差、空气富裕量大,加热炉无法达到最佳燃烧状态的问题,设计了具有自动控制功能的理论配比燃烧控制方案。该方案通过监测烟气中CO含量来监测加热炉的燃烧状况,根据燃烧曲线自动调节进炉的空气量,以保持加热炉各火嘴在接近理论的空燃比下安全燃烧,从而改善了加热炉的燃烧效果。实际工业应用结果表明,该燃烧控制方案投用后,烟气中的O2体积分数仅有0.54%,燃料气流量和燃烧空气量基本达到了理论配比,加热炉的热效率提高了0.6%,加热炉燃料气流量减少296 m3/h左右,烟气中的氮氧化物体积分数降低了10μL/L,氮氧化合物排放减少43.48%,风机每小时节电72 k W·h,各项指标均优于传统的手动调节和常规燃烧控制方案。To find the solutions to poor control precision of heating furnace of the PX unit in a refining ＆ chemical company and inability to optimize the operation of heating furnace due to large amount of surplus air, the stoichiometric combustion control scheme with self control function is designed. In this control scheme, CO in flue gas is the proeess variable used for combustion control of furnace. By monitoring the flue gas CO con- tent in the furnace, the quantity of air into the furnace is adjusted according to the combustion curve so as to maintain the safe combustion of fire nozzles at close to the theoretical air-fuel ratio and optimize the heater combustion efficiency. The commercial application shows that, after practice of this combustion control scheme, the volumetric percentage of O2 in the flue gas is only 0.54%, the fuel and air has basically reached lhe theoretical ratio, the thermal efficiency of the furnace is increased by 0.6% , the fuel gas consumption of the furnace is reduced by about 296 m3/hr, the NOx in flue gas emissions is lowered by 10 μL/L and emission reduction is 43.48%, and 72 kilowatts of electricity is saved per hour. All these indicators arevbetter than those of conventional manual adjustment and conventional combustion control scheme.

关 键 词：PX装置 加热炉 理论配比燃烧 热效率 CO含量 

分 类 号：TE963[石油与天然气工程—石油机械设备] TQ241.13[化学工程—有机化工]