冷、热进料对酸性水汽提塔操作影响的模拟分析

Simulation and Analysis of Influencing of Cold/Hot Feeds on Acidic Water Stripper

镇海炼化80 t/h加压汽提装置汽提塔采用侧线抽氨工艺,处理上游装置产生的含硫含氨酸性水。汽提塔采用1.0 MPa过热蒸汽作为热源,塔顶采出酸性气送至硫黄装置回收硫黄,侧线气经三级分凝、氨精制后回收液氨产品,塔底净化水供上游装置回用。为兼顾环保与节能目标,利用Aspen PLUS软件模拟分析冷、热进料比对该汽提塔的影响,主要定量分析冷、热进料比对汽提塔温度分布、蒸汽消耗、塔底净化水水质的影响,以期找出最佳操作条件,在兼顾净化水质量的前提下,降低蒸汽消耗。

The stripping tower of the 80t/h pressurized stripper in Zhenhai Refining&Chemical adopts side line ammonia extraction process to treat the acidic water containing sulfur and ammonia produced by upstream units.The stripping tower uses 1.0 MPa superheated steam as heat source,and the acidic gas from the top of the tower is sent to sulfur unit to recover sulfur.The side line gas goes through the third-stage segregation and ammonia refining to recover liquid ammonia product,and the bottom purified water is reused in upstream units.In order to balance environmental protection with energy saving,this paper uses Aspen PLUS software to simulate the effects of cold and hot feed ratio on the stripping tower,mainly to find the temperature distribution,steam consumption and bottom water purification of the stripping tower.Their impacts are quantitatively analyzed to find the best operating conditions and reduce steam consumption while ensuring the quality of the purified water.The model established by Aspen PLUS software has certain guiding significance for the stripping tower operation adjustment and optimization.