Fully-closed oil tank dehydration system

Abstract

The invention belongs to the technical field of petrochemical engineering, and particularly discloses a fully-closed oil tank dehydration system which comprises: an oil storage tank and a dehydrator, and further comprises: a desilting tank installed between the oil storage tank and the dehydrator through a connecting pipeline; a suspension piston capable of suspending on the liquid level which is arranged in the buffer tank, wherein the piston divides the buffer tank into an upper adjusting area and a lower liquid storage area; and a sewage discharge device. According to the oil tank dehydration system, the silt sedimentation treatment process, the primary dehydration process of oil-water separation, the further interception of oil sludge and the air pressure treatment process in the pipeline are completely completed in the closed pipeline, and then final dehydration is completed, so that the dehydration pipeline is effectively prevented from being blocked, and smooth circulation of the pipeline is ensured; and meanwhile, the finally removed sewage does not contain oil, the utilization rate of the oil is greatly improved, toxic and harmful gas cannot be discharged into air during dehydration, pollution to the environment and soil cannot be caused, and use is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a fully enclosed oil tank dehydration system. Background technique [0002] In the prior art, there will be some water in the oil stored in the oil storage tanks commonly used in the petrochemical industry. After long-term storage, the water will settle to the bottom of the liquid storage tank. The water at the bottom is dehydrated, and the current dehydration technology is to directly discharge the water into the sewage pool below the storage tank, and then flow into the sewer for discharge. With the continuous improvement of safety and environmental protection requirements, this direct exposed type There are many disadvantages in the dehydration method, as follows: [0003] 1. When the oil storage tank is dehydrated, the sewage is discharged into the sewage pool without any treatment, and the oil-water mixture in the oil storage tank contains a large...

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Problems solved by technology

[0003] 1. When the oil storage tank is dehydrated, the sewage is discharged into the sewage pool without any treatment, and the oil-water mixture in the oil storage tank contains a large amount of VOCs, H 2 S and other toxic and harmful gases volatilize into the air, and because the density of these toxic gases is higher than that of the air, they float on the ground or penetrate into the soil after long-term settlement, causing air pollution and soil pollution, which has greater safety hazards. Hidden dangers, but also a threat to the health and life safety of on-site workers;

[0004] 2. Since dehydration is transported through underground pipelines buried in the ground, when the underground pipeline is damaged or leaks and cannot be found in time, it will pollute the soil and groundwater, violating the "Soil Pollution Prevention and Control Law of the People's Republic of China" (2018 Announced on August 31, 2019 and implemented on January 1, 2019), the regulations cannot better protect and improve the ecological environment and prevent and control soil pollution, and cannot protect public health;

[0005] 3. During the dehydration process, oil leakage accidents often occur. The leaked oil is easy to form a blockage due to its high viscosity. If it cannot be drained from the sewer in time, it will overflow to the ground, pollute the air, surface water and soil, and form a huge potential safety hazards, and at the same time, the oil cannot be collected to a large extent, which also causes a certain degree of waste

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