Exploration of Energy Conservation through Replacement of Liquefied Hydrocarbon Storage Tanks Before Operation and Maintenance
Before the new liquefied hydrocarbon storage tank is put into use,it is necessary to replace the air inside the tank to reduce the oxygen content in the gas inside the tank by less than 3%Before maintenance of liquefied hydrocarbon storage tanks,it is necessary to replace the hydrocarbon gas inside the tank.If the lower explosive limit of the stored hydrocarbons is≥4%,the hydrocarbon content of the gas inside the tank after replacement is required to be not more than 0.5%;If the lower explosive limit of stored hydrocarbons is less than 4%,the hydrocarbon content in the gas in the tank after replacement is required to be not more than 0.2%.In the petrochemical industry,the commonly used methods include water replacement method and nitrogen replacement method.Due to the need for secondary treatment of the water used by water replacement method(currently,storage tanks tend to be larger,usually several thousand cubic meters),it will increase the load of enterprise sewage treatment plants and water treatment costs.China is a country lacking freshwater resources(especially in the northern region),and water replacement method will also cause waste of water resources,so nitrogen replacement method is usually used.
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