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一、问题的提出我们公司重质酮苯脱蜡装置1985年8月技术改造设计时,由于结晶过滤部分采用二段脱蜡新工艺,使新鲜溶剂比降低。在溶剂回收部分的滤液和蜡液系统都采用三效蒸发。加之换热流程的全面调整,使热回收率大大提高,加热炉热负荷成倍下降,如表1所示。由表1可见,技术改造后加热炉热负荷不足公称热负荷的四分之一,依旧利用原加热炉不仅过剩空气系数将很高,炉热效率低,而且难以操作。当时我们曾设想:(1)用蒸汽加热。但由于重质酮苯脱蜡甲苯含量高,炉出口温度要求200～205℃,
First, the question put forward Our company heavy ketones benzene dewaxing device 1985 technological transformation design, the crystallization of the filter part of the second paragraph dewaxing new technology, so that the ratio of fresh solvents to reduce. In the solvent recovery part of the filtrate and wax liquid system are three-way evaporation. Coupled with the overall adjustment of the heat exchange process, the heat recovery rate greatly increased, the heating furnace load doubled, as shown in Table 1. It can be seen from Table 1 that after the technological transformation, the heat load of the heating furnace is less than one quarter of the nominal heat load, and still using the original heating furnace not only the excess air coefficient will be very high, but also the furnace thermal efficiency is low and difficult to operate. At that time we had envisaged: (1) with steam heating. However, due to the high content of heavy benzene, benzene dewaxing toluene, the furnace outlet temperature requirements of 200 ~ 205 ℃,