摘要
以催化重整装置的重沸炉为研究对象,设计了一套完整的控制方案。在研究重沸炉燃料气传统控制的基础上,针对其存在的问题,引入偏心孔板和燃料气密度分析仪,以孔板测量物料汽化量带来的差压变化,设计了采用汽化率串级控制燃料气质量流量的方案,并探讨了偏心孔板的选型计算及安装注意事项,给出了偏心孔板的选型参数:孔径比按0.7选取,偏心度按管道半径与孔板孔半径之差选取,设计了改进型燃料气控制的DCS组态原则;考虑到炉子的安全稳定运行、热效率提高和减少污染气体排放等指标,结合催化重整的工程实际,设计了炉膛的压力和烟气氧含量控制,给出了控制目标:保证炉膛压力的最大值为-25 Pa,氧体积分数的最小值控制在2.5%。
In view of the catalytic reforming reboiler heaters,a complete control scheme is designed. On the basis of study on the conventional control of furnace fuel gas and the existing problems,the eccentric orifice plate and the fuel gas density analyzer are applied to measure the differential pressure changes resulting from evaporation materials and design the cascade control of fuel gas mass flow by the vaporization ratio. The attentions in the calculation for the selection and installation of the eccentric orifice plates are studied. The parameters for the selection of eccentric orifice plate are given such as diameter ratio is 0. 7,eccentricity is（ D/2-d/2）,and the DCS configuration of the modified fuel gas control is designed. Considering the safe and stable operation of the reboiler heaters and increase of thermal efficiency and reduction of pollution gas emissions,the pressure of the furnace chamber and oxygen content in the flue gas are designed in consideration of engineering practice of catalytic reforming. Control objectives are given：-25 Pa maximum furnace chamber pressure and 2. 5% minimum oxygen content.
出处
《炼油技术与工程》
CAS
2017年第8期57-60,共4页
Petroleum Refinery Engineering
关键词
重沸炉
催化重整
燃料气控制
汽化率
偏心孔板
烟气氧含量控制
reboiler heater
catalytic reforming
fuel gas control
vaporization ratio
eccentric orifice plate
control of oxygen content in flue gas
