用显热加热重沸器已被广泛应用于石油化工装置,但如果设计不当,也会造成重沸器温度控制的失败。某催化汽油加氢脱硫装置,其稳定塔重沸器采用高温工艺流体作为加热介质,塔釜温度由设在加热介质主管线上的主调节阀和旁路线上的压差调节阀共同控制。但开工初期塔釜温度难以控制,其原因主要有两个:一是重沸器加热介质流量小,且在不稳定的过渡沸腾区操作;二是旁路调节阀两侧的管路压差过大。改进措施主要有:适当降低稳定塔的操作压力,并增加主管线上加热介质的流量,减少旁通线流量,使重沸器完全在稳定的泡核沸腾区操作;将稳定塔温度控制改为三通调节阀控制,以避免旁路调节阀两侧的压差测量值不能准确反应主调节阀的压差变化,从而导致控制的紊乱。上述措施实施后,稳定塔釜温控得到明显改善,且产品质量合格。 With sensible heat reboiler has been widely used in petrochemical installations, but if not properly designed, will result in the failure of reboiler temperature control. A catalytic gasoline hydrodesulfurization unit, the stabilizer reboiler using high temperature process fluid as the heating medium, bottoms temperature is provided in the heating medium main line on the main control valve and the bypass line pressure control valve jointly controlled. However, the initial start of the tower reactor temperature is difficult to control for two main reasons: First, the reboiler heating medium flow is small, and in the unstable transition boiling zone operation; the second is the bypass valve on both sides of the pipeline pressure differential Big. The improvement measures mainly include: appropriately reducing the operating pressure of the stabilizer, increasing the flow of the heating medium on the main line, reducing the flow of the bypass line, allowing the reboiler to operate completely in the stable nucleate boiling zone; changing the temperature of the stabilizing tower to Three-way control valve control, to avoid the bypass valve on both sides of the pressure measurement can not accurately reflect the main control valve pressure changes, resulting in control of the disorder. After the implementation of the above measures, the stability of the reactor temperature control has been significantly improved, and product quality standards.