A method and device for preliminary separation of oil and water coupled with oil and gas washing

Abstract

The invention relates to an oil-gas-washing-coupled oil-water initial separation method and device. The method comprises the following steps: light oil containing 0.5-6% of synthetic water and hydrocarbon-component-containing gas enters a tubular mixer at an inlet section to wash hydrocarbon components in the gas, and are subjected to liquid separation by a T-shaped liquid-gas separator; the water-containing oil sequentially passes through a rectifying distributor, a water drop coarse granulation module and a CPI quick dewatering module from left to right, and the water enters a water drum; sewage containing 0.05-0.5% of oil enters from a right end socket, and freely flows leftwards to sequentially pass through an oil drop coarse granulation module and an CPI quick oil removal module to perform oil removal; and finally, the water in the water drum and the water obtained by right partition oil removal are discharged by an oil-water interface controller; and the oil separated from the right side of the partition is communicated with the oil on the left side via the upper part of the partition, and is discharged under the action of a liquid level controller. The method couples the functions of oil dewatering, water oil-removal and oil-gas washing recycling, has the advantages of small occupied space and quick and efficient separation, and overcomes the defects in the prior art.

Description

technical field [0001] The invention relates to the field of petroleum refining or coal chemical industry, and relates to a preliminary oil-water separation method coupled with oil-gas washing in a Fischer-Tropsch synthesis process. Background technique [0002] Fischer-Tropsch synthesis (Fischer-Tropsch synthesis) is one of the indirect coal liquefaction technologies, which can be referred to as FT reaction for short. It uses synthesis gas (CO and H 2 ) is a process of synthesizing paraffin-based liquid fuels with catalysts (mainly iron) and appropriate reaction conditions as raw materials. Fischer-Tropsch coal-to-oil products mainly include gasoline, diesel, kerosene, aviation fuel, lubricating oil and paraffin. The indirect liquefaction product of Fischer-Tropsch synthetic coal is a mixture of oil and water, and the efficient separation of oil and water has an important impact on reducing product costs. [0003] At present, the method of gravity sedimentation is mainly ...

AI Technical Summary

Problems solved by technology

The equipment occupies a large area, consumes a lot of materials and has low efficiency

In addition, the gas phase components discharged after low-pressure separation in the process flow also contain a small amount of hydrocarbons. Generally, a separate washing device is installed for washing and recovery, and a supporting operation control system is required, which is expensive and complicated.

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