Multiphase oil-water separation equipment and oil-water separation method using the equipment

Abstract

The invention discloses multiphase oil-water separating equipment and an oil-water separating method using the equipment. The multiphase oil-water separating equipment comprises a natural settling part, an inclined plate coalescing part and an air flotation separation part, wherein the natural settling part comprises a circulating water inlet and a first oil collecting machine, circulating water enters from the circulating water inlet and naturally settles and then the first oil collecting machine arranged at the upper part is used for collecting light oil in the circulating water; the inclined plate coalescing part comprises an upper oil collecting zone and an inclined plate coalescing zone arranged at the lower part, the upper oil collecting zone is used for containing light oil naturally settling, and the inclined plate coalescing zone is used for coalescing heavy oil in the circulating water; and the air flotation separation part comprises a second oil collecting machine arranged at the upper part, a dissolved gas releaser arranged at the middle part, an inclined plate coalescing zone and a water outlet which are arranged at the lower part, the second oil collecting machine is used for collecting light oil and oil slick generated by the inclined plate coalescing zone in the upper oil collecting zone and at the air floatation separation part, the dissolved gas releaser generates air bubbles so as to separate oil slick out of the circulating water, the inclined plate coalescing zone is used for coalescing heavy oil in the circulating water, and the separated circulating water outflows from the water outlet. The multiphase oil-water separating equipment can be widely applied to industries such as semi coke and oil shale, can serve as an oil-water separating device for the circulating water and can also serve as a pretreatment system for the circulating water or coke quenching water, so the circulating water or coke quenching water meets the discharge standards.

Description

technical field [0001] The invention relates to the field of oil-water separation, in particular to a multi-phase oil-water separation device used in semi-coke and oil shale industries and a method for using the multi-phase oil-water separation device. Background technique [0002] The semi-coke (semi-coke) in the semi-coke industry refers to a kind of high-fixed coke produced by the low-temperature dry distillation process of the square furnace and the low-temperature dry distillation process at 600-700 ° C, using non-caking coal and weakly sticking coal in the Jurassic era as raw materials. In the process of producing semi-coke, coal tar and coke oven gas will be by-produced at the same time. After more than 20 years of development, the semi-coke industry has become an industry that undertakes raw coal production, coal chemical industry, and energy-carrying industries, and is widely used in various industries because of its good use characteristics. Semi-coke has high fixe...

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Problems solved by technology

[0005] 1. The existing large tank system adopts a simple serpentine flow channel. The layout of this flow channel is unreasonable. In the actual production process, there are problems such as short flow, back-mixing, short residence time, and fast flow rate. The hydraulic separation condition is not good, which affects Oil-water separation effect, which in turn affects the amount of coal tar that can be recovered;

[0006] 2. The current separation method only uses gravity separation, but there are suspended light coal tar and heavy coal tar oil droplets with a diameter of tens of microns, which cannot be effectively separated from water by short-term gravity settlement, and the separation accuracy is not high and the efficiency is low. ;

[0007] 3. The large separation tanks used in the current separation method are all open-ended operations, resulting in more flammable and explosive gases such as coal tar, ammonia, and phenol volatilized around the factory area, which poses a greater safety hazard to the surrounding environment and operators and hazards;

[0008] 4. On-site operation and measurement generally rely on experience and manual work, such as collecting oil, adding water, etc., which is labor-intensive, low-efficiency, and without automatic control, which affects production efficiency

[0009] In short, the current "big tank gravity settlement" method has disadvantages such as poor hydraulic conditions, incomplete separation, high safety hazards, and no automatic control. The poor oil-water separation effect has a great impact on production. On the one hand, it affects the output of coal tar. On the one hand, the concentration of coal tar in the circulating water is too high, which affects the subsequent absorption process of circulating water / raw coal gas, forming a vicious circle

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