第46卷第4期
石油与天然气化工
CHEMICAL ENGINEERING OF OIL & GAS
一种新的评估MTO反应生焦量大小的方法
白永伟麻丽娟
中煤陕西榆林能源化工有限公司
摘要从能量守恒角度对MTO反应生焦量的大小进行了评估。MTO反应过程中生成的焦炭附着在分子筛催化剂的活性中心上，导致催化剂失活，为恢复催化剂活性，催化剂需再生烧焦。由于焦炭燃烧释放的能量被用于生产蒸汽，所以计算生产蒸汽过程的炝变大小就能体现焦炭量的大小。利用工业上通用的水蒸气热力学性质计算公式IAPWS-IF97，对某企业MTO装置两个汽包在不同温度、压力条件下，产汽过程燎变进行计算。通过软件SigmaPlot13.0对变数据进行处理，得出产汽过程烩值变化公式，进而得出单位质量甲醇由于生成焦炭而损失能量大小的公式，为调整MTO反应操作条件、降低生焦量提供了指导。
关键词甲醇制烯烃生焦量产汽过程炝变
中图分类号：TQ221
文献标志码：A
DOI:10.3969/j.issn.1007-3426.2017.04.010
A newmethod forassessingthe cokeamount inMTOreaction
BaiYongwei,MaLijuan
China Coal Shaanxi Yulin Energy Chemical Co -, Lid, Yulin, Shaanxi, Chind
Abstract: The coke amount in the MTO reaction is evaluated from the perspective of energy conservation in this paper. The coke produced during the MTO reaction is attached to the active center of the molecular sieve catalyst , resulting in deactivation of the catalyst . To recover the catalyst activity , the catalyst is regenerated and burnt , and the heat released from char burning is used to produce steam. Therefore, calculating the size of the process of steam production will be able to reflect the size of the coke amount . Based on the formula IAPWS-IF97 , which is a general calculation formula for the thermodynamic properties of steam in industry , the enthalpy change of steam production process at different temperature and pressure is calculated in the two steam drums of M TO unit. The enthalpy change data is processed by software SigmaPlot 13.O and the formula of the enthalpy change of the steam production process is obtained , so the formula of the energy loss of the unit mass of methanol due to the formation of coke is received , which provides guidance for adjusting of the operating conditions of M TO reaction to reduce the coke amount .
Key words : methanol to olefins (M TO), coke amount, steam production process , enthalpy change
对价格低廉、含量丰富的煤炭资源开展煤经甲醇制取低碳烯烃的工业化项目，不仅对实现我国以煤代油、低碳烯烃生产原料多元化具有重大的现实意义，而且对国家的能源安全具有深远的历史意义。甲醇制烯
53
烃（Methanol toOlefin，MTO)技术的发展改变了以往乙烯和丙烯的来源主要依靠石油烃类的蒸汽裂解的格局，开辟了一种由煤、天然气经甲醇生产高附加值产品乙烯、丙烯的路线1。
作者简介永伟（1987一），男，现就职于中煤陕西榆林能源化工有限公司烯烃中心，主要从事煤制烯烃生产操作工作。 E-maif存24@qq.com