CAJ | 학술논문

建立了1个考虑自蒸发作用的汽包动态模型,引入自蒸发速度计算公式,将该汽包模型作为费托合成反应器的换热系统在Aspen Dynamics中进行动态模拟.考察了当存在反应器入口液相温度变化、反应器设定温度变化及新鲜气流量变化等扰动时系统的动态响应.结果表明使用"Flash"汽包模型对反应器温度波动的计算结果要比使用自蒸发汽包模型时偏小;与用固定温度冷却水移热相比,使用汽包换热更加有利于对反应器温度的控制.水蒸发压力差变化的补偿作用使得汽包蒸发面积对汽包自蒸发速率的影响很小.随着汽包-换热管体系中水体积以及水蒸气体积的增加,反应器温度的最大波动值变大;但随着传热温差的减小,水蒸气的体积变化对温度波动的作用减弱.
건립료1개고필자증발작용적기포동태모형,인입자증발속도계산공식,장해기포모형작위비탁합성반응기적환열계통재Aspen Dynamics중진행동태모의.고찰료당존재반응기입구액상온도변화、반응기설정온도변화급신선기류량변화등우동시계통적동태향응.결과표명사용"Flash"기포모형대반응기온도파동적계산결과요비사용자증발기포모형시편소;여용고정온도냉각수이열상비,사용기포환열경가유리우대반응기온도적공제.수증발압력차변화적보상작용사득기포증발면적대기포자증발속솔적영향흔소.수착기포-환열관체계중수체적이급수증기체적적증가,반응기온도적최대파동치변대;단수착전열온차적감소,수증기적체적변화대온도파동적작용감약.
With a steam drum (SD) model that contains the effect of evaporation,the dynamic response of heat exchange system for F-T synthesis reactor has been studied with an Aspen Dynamic software.The main perturbations are the following:some change of slurry temperature at the reactor inlet,the change of set point of the reactor temperature and the change of the flux of fresh gas.As a result,the fluctuation of the reactor temperature is smaller when the steam drum is calculated with the "Flash" module than that the "self-evaporation" steam drum module is used.It is shown that the steam drum gains more advantage in adjusting the reactor temperature compared with the water of constant temperature in removing the reaction heat.Since the compensation of the change of pressure difference for the water evaporation,the effect of the evaporation area on the flux of evaporation in steam drum can be neglected.With the volume of steam or water in the steam drum increasing,the fluctuation of the reactor temperature will increase;nevertheless,the decrease of the temperature difference for heat transfer will weaken the effect of the volume in steam drum.