应用流程模拟技术控制延迟焦化装置干气质量  

Using Process Simulation Technology to Control Dry Gas Quality for Delayed Coking Units

作　　者：郭守学[1] 王宾[1] 刘彦昌[1] 袁志祥[1] 

机构地区：[1]中国石化青岛炼油化工有限责任公司,山东青岛266500

出　　处：《中外能源》2011年第4期87-92,共6页Sino-Global Energy

摘　　要：以青岛炼化公司2.5Mt/a延迟焦化装置吸收稳定部分为研究对象,运用Aspen流程模拟软件,以标定数据为基准,建立吸收稳定部分模型,对焦化干气质量控制进行模拟,并研究了改变补充吸收剂的流量、温度和性质后对干气质量的影响。以模拟结果为依据,对装置操作进行优化,补充吸收剂量控制在105t/h,脱吸塔、稳定塔塔底温度控制在145℃和198℃时,干气中C3以上含量可以控制在1.8%～2.0%,日增液化气6.8t,年增收益600万元以上,同时,装置能耗降低1.02kgEo/t;通过进一步研究表明,降低补充吸收剂温度,能够有效提高干气质量,但是由于受到循环水温度的局限,补充吸收剂温度无法进一步降低。为此,研究了模拟使用深冷技术,将补充吸收剂、吸收塔一中二中回流深冷至20℃后,干气中C3以上含量可以降至1%以内,并可使装置能耗进一步降低,为装置进一步优化指明了方向。Taking the absorption-stabilization section of Sinopec Qingdao Refining and Chemical Company′s 2.5Mt/a delayed coking unit as the object of study,researchers simulated the control of quality of coking dry gas by establishing an absorption-stabilization section model based on rating data using Aspen process simulation software and studied the effect of changing the flow rate,temperature and properties of supplementary absorber on the quality of dry gas.Based on the simulation results,these researchers optimized the operating conditions of the unit by maintaining the flow rate of supplementary absorber at 105t/h.When the temperatures at the bottom of the desorption tower and the stabilization tower are controlled at 145℃ and 198℃,the content of C3 and above in dry gas can be maintained within the range from 1.8% to 2.0%.LPG output will rise by 6.8t per day and revenue will increase by more than six million yuan per year.The unit′s energy consumption will drop by 1.02kgEo/t.Further study suggests that reducing the temperature of supplementary absorber can effectively improve the quality of dry gas.However,limited by the temperature of circulating water,the temperature of supplementary absorber cannot be reduced further.To resolve this problem,these researchers simulated the use of cryogenic technology.After the supplementary absorber and the primary and secondary intermediate refluxes are cryogenically cooled to 20℃,the content of C3 and above components can be reduced to below 1% and the unit′s energy consumption can be reduced further,laying the groundwork for the further optimization of the unit.

关 键 词：延迟焦化 流程模拟 吸收稳定系统 补充吸收剂 干气质量 

分 类 号：TE624.32[石油与天然气工程—油气加工工程]