Heavy oil storing tank VOCs safe recycling system and process

Abstract

The invention discloses a heavy oil storing tank VOCs safe recycling system and process and belongs to the technical field of petrochemical engineering environment protecting. The heavy oil storing tank VOCs safe recycling system comprises a first heavy oil storing tank, a second heavy oil storing tank, a first gas sucking cooling liquid window, a second gas sucking cooling liquid window and a gassucking draught fan; an exhausting port of the first heavy oil storing tank is connected with the gas sucking draught fan through a first pipeline; the middle portion of the first pipeline is connected with a second pipeline which is used for conveying heavy oil products after being cooled into an underground oil dirt tank; the gas sucking draught fan is further connected with a heating furnace burning nozzle; heavy oil volatile gas sucked out through the gas sucking draught fan is introduced into the heating furnace burning nozzle to be incinerated; and the first pipeline and a third pipeline are provided with breather valves and gas sucking port silencers correspondingly. Due to the heavy oil storing tank VOCs safe recycling system and process, the pollution to the environment by oil and gas volatizing can be prevented, the safety and the reliability of the recycling process are guaranteed, nitrogen is hardly consumed during normal operation, and noise pollution cannot be caused, either.

Description

technical field [0001] The invention relates to the field of petrochemical environmental protection technology, in particular to a VOCs safe recovery system and recovery process for heavy oil storage tanks. Background technique [0002] "Code for Design of Vertical Cylindrical Steel Welded Oil Tanks" (GB50341-2014) stipulates that the operating pressure range of fixed roof oil tanks is -0.295~18KPa. The breathing valve on the top of the conventional heavy oil storage tank directly discharges to the air. When the pressure of the storage tank is higher than 18KPa, the breathing valve opens and the gas containing styrene and other organic substances in the gas phase space of the storage tank is discharged into the air, causing environmental pollution. When the pressure of the storage tank is lower than -0.295KPa, the breathing valve is opened to inhale air; in order to ensure that the air does not enter the storage tank, forming a negative pressure state and generating explosiv...

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Problems solved by technology

[0004] However, the above-mentioned prior art consumes a lot of nitrogen and relies heavily on the pressure sensor. Once the pressure sensor fails, it may cause the operation of the storage tank beyond the pressure range

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