MTBE合成及裂解装置节能对策的探讨

A DISCUSSION ON MEASURES OF ENERGY SAVING IN MTBE SYNTHESIS AND CRACKING UNITS

探讨了中国石化燕山分公司MTBE合成及裂解装置的节能措施。将MTBE合成、裂解装置甲醇回收系统合并运行，停开一个甲醇回收塔；实现MTBE产品向MTBE裂解装置直输，减少物料的热量损失；利用Aspen Plus软件优化两套装置3个精馏塔的操作，降低各塔的热负荷；降低MTBE裂解反应的温度，减少中压蒸汽的消耗量；应用凝结水闭式回收技术，将装置凝结水的余热再利用；提高循环冷却水质量、用好蒸汽疏水器对装置节能均具有积极作用。上述措施的实施，可节约总能量为2．702×10^8MJ／a，MTBE合成和裂解两装置节能的经济效益总和为2064．98万元／a。

Measures of energy conservation for the MTBE synthesis unit and cracking unit of SINOPEC Yanshan Company were discussed, such as using one set of methanol recovery system for both synthesis unit and cracking unit and thus one methanol recovery tower could be shut down, transferring MTBE product from synthesis unit to cracking unit directly for less heat loss, using Aspen Plus software to optimize the operation of the three fractionation towers in the two units for decrease of individual heat duty, reducing the reaction temper- ature of MTBE cracking to decrease the consumption of medium pressure steam, applying closed-loop condensed water recovery technology to utilize the heat in condensed water, and improving the quality of circulating water. Since these measures put into practice, the total energy saving of these two units was 2. 702 × 10^8 MJ annually, which provided an economic benefit of 20.65 million RMB per year.