Abstract:

Taking a certain refining and chemical company as the research object, the application status of condensate classification utilization is studied and analyzed. By establishing a condensate classification utilization model and combining it with online water quality monitoring, based on the historical data of condensate quality stored in the refinery LIMS(laboratory information management system) database, DCS(distributed control system) is used to achieve classification recovery of condensate. The study shows that the use of DCS reduces the amount of condensate replenished into the circulating water system, effectively eliminating “high water low use”. By evaluating the continuous operating cycle and utilization rate of condensate recovery, the operating cycle increases by 13.25%, and the periodic utilization rate increases by 20.3 percentage points. The condensate recovery effect is significant. The classification recovery model can effectively ensure the qualified quality of boiler water and steam while achieving efficient utilization of condensate. However, considering the impact of circulating water quality, the utilization rate of condensate cannot reach 100%.

Key words: refinery, condensate, classification utilization, control logic, water quality, continuous operating cycle, utilization rate

摘要：

以某炼化企业为研究对象，对凝结水分级利用的应用状况进行研究和分析。通过建立凝结水分级利用模型，结合水质在线监测技术，以炼油厂LIMS(实验室信息管理系统)数据库储存的凝结水水质历史数据为基础，利用DCS(分布式控制系统)来实现对凝结水的分级回收。研究表明：利用DCS减少了补入循环水系统的凝结水量，有效避免了“高水低用”。通过回收凝结水连续运行周期及利用率两个指标进行评价，运行周期增加了13.25%,周期性利用率增加了20.3百分点，凝结水回收效果显著。分级回收模型可有效保证锅炉水汽品质合格同时实现凝结水高效利用。但考虑到循环水水质的影响，凝结水利用率无法达到100%。

关键词: 炼油厂, 凝结水, 分级利用, 控制逻辑, 水质, 连续运行周期, 利用率