Method and device for quickly separating oil and water under high temperature and high pressure

Abstract

The invention discloses a method and device for quickly separating oil and water under high temperature and high pressure. The device comprises an upper shell and a lower shell; a hydrocyclone is arranged in the upper shell and used for primary separation; the lower shell is provided with a coalescer for secondary separation; and an overflow liquid outlet and an underflow liquid outlet are arranged on the upper shell and can be respectively connected with an overflow liquid backflow port and an underflow liquid backflow port arranged on the top of the lower shell through pipelines. According to the method and the device, the high-temperature and high-pressure resistance of the hydrocyclone can be improved by changing the connection positions of outer interfaces of the upper shell and the lower shell according to the change of the composition of a separated medium, so that the rapid separation of oil and water in one device can be realized, and the separation efficiency can be improved.

Description

technical field [0001] The invention relates to a method and device for quick separation of oil and water under high temperature and high pressure, and belongs to the technical field of material separation. Background technique [0002] Energy is the power source of national industry, economy and social operation, and also the basis of modern human survival and social development. Indirect coal liquefaction uses coal as the raw material, converts coal into synthesis gas through gasification, water-gas shift, purification and other processes, and then converts synthesis gas into clean intermediate oil products through Fischer-Tropsch synthesis process, through fine processing of intermediate oil products , forming clean Fischer-Tropsch wax, diesel, gasoline, LPG, LNG and other products and high value-added chemicals. [0003] In the Fischer-Tropsch synthesis intermediate oil treatment process, oil-water separation is an important process of the process. For example, the hig...

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Problems solved by technology

Patent CN104673367A discloses a step-by-step separation method of mixed oil and water coupled with oil and gas washing. The Fischer-Tropsch synthetic oil-water mixture undergoes preliminary dehydration of oil and preliminary deoiling of water in a preliminary separator, and then enters a deep dehydrator and a deep degreaser respectively. Although the method of coupling separation of two containers helps to improve the separation efficiency, it increases the equipment investment cost.

[0009] At present, the cyclone used for oil-water separation is basically a structure with a flat top plate, a tangential rectangle or a volute inlet cylinder, an overflow pipe, a large cone, a small cone and a wake tube. This structure is an efficient oil-water separation However, there are many connecting welds in each structural part, and the tangential rectangular inlet or the volute inlet will generate high local stress and deformation, which makes the cyclone unable to withstand high temperature and pressure loads; if only relying on Increasing the wall thickness of the plate and reinforcing ribs to increase the pressure and temperature bearing will greatly increase the manufacturing difficulty and production cost of the equipment, and cannot solve the stress and deformation problems of various structural components

[0010] Furthermore, the oil-water separation method described in the current patent is mainly a single process of deoiling sewage with low oil content, crude oil dehydration and purification with low water content, or oil-water pre-separation with an equivalent oil-water mass ratio, which cannot satisfy all three in one device. conditional oil-water separation

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