甲烷深冷分离装置提高LNG产量的方法
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摘要
介绍了某甲醇企业甲烷深冷分离装置的现状,其主要原因为实际生产时煤气中甲烷含量比原设计值偏高,造成系统冷量不足,部分甲烷无法液化成为LNG,多余的甲烷进入后续工段又造成膨胀机负荷不匹配无法正常运行,系统冷量进一步受到影响,形成恶性循环,又致使后续甲醇合成装置合成效率下降,弛放气放空量过大,产品消耗高、产量低。通过一定的技术改造向甲烷深冷装置中输入更多的冷量,让更多的甲烷液化成为LNG,从而提高LNG产量,达到了节能降耗、增产、增效的目的。
The paper introduces the current status of methane cryogenic separation unit in a methanol enterprise and the fact that the methane content in the gas is higher than the original design value during actual production,resulting in insufficient system cooling capacity,thus some methane cannot be liquefied into LNG,and excess methane enters downstream sections,disturbing the load of the expander and normal operation.The cooling capacity of the system is further affected,forming a vicious circle,which leads to a decreased efficiency of the subsequent methanol synthesis unit.What's more,there is too big a volume of vented purge gas,resulting high product consumption and low output.Through a certain extent of technical transformation,more cooling capacity is input into the methane cryogenic unit,to liquefy more methane into LNG,thereby increasing LNG production and achieving the purpose of energy saving,and production and efficiency increasing.
The paper introduces the current status of methane cryogenic separation unit in a methanol enterprise and the fact that the methane content in the gas is higher than the original design value during actual production,resulting in insufficient system cooling capacity,thus some methane cannot be liquefied into LNG,and excess methane enters downstream sections,disturbing the load of the expander and normal operation.The cooling capacity of the system is further affected,forming a vicious circle,which leads to a decreased efficiency of the subsequent methanol synthesis unit.What's more,there is too big a volume of vented purge gas,resulting high product consumption and low output.Through a certain extent of technical transformation,more cooling capacity is input into the methane cryogenic unit,to liquefy more methane into LNG,thereby increasing LNG production and achieving the purpose of energy saving,and production and efficiency increasing.
引文
[1]潘奇峰.浅谈甲烷深冷分离装置的调试运行[J].小氮肥,2013,41(7):24-26.
[2]刘新波,孙乃良,杨延奇,等.一种提高甲烷深冷分离LNG收率的系统:CN,206546060[P].2017-10-10.
[2]刘新波,孙乃良,杨延奇,等.一种提高甲烷深冷分离LNG收率的系统:CN,206546060[P].2017-10-10.