A tower type extraction device for separating hydrocarbons in oily sludge by using supercritical carbon dioxide

Abstract

The invention provides a tower-type extraction device for separating hydrocarbons in oily sludge by using supercritical carbon dioxide. The device consists of a valve, a booster pump, a gas compressor, a heat exchanger, a pressure gauge, a gas cylinder, a storage tank, It is composed of electric mixer, continuous extraction tower, high-pressure separation kettle and other equipment; the device is divided into supercritical carbon dioxide supply system, oily sludge supply system, temperature control and pressure control system, hydrocarbon extraction system and reflux system. By setting a continuous extraction tower, the device effectively shortens the extraction process, improves extraction efficiency, reduces cost investment, and realizes continuous extraction of oily sludge. It has the advantages of high degree of automation, easy prying and convenient operation.

Description

technical field [0001] The invention relates to a tower-type extraction device for separating hydrocarbons in oily sludge by using supercritical carbon dioxide, and relates to the field of oily sludge treatment and resource utilization in the petrochemical industry. Background technique [0002] Oily sludge is oily solid waste produced in the process of oil and natural gas exploitation, transportation, refining and oily sludge water treatment. According to statistics, Shengli Oilfield produces more than 100,000 tons of oily sludge each year, Dagang Oilfield produces about 150,000 tons of oily sludge each year, and Henan Oilfield produces about 50,000 tons of oily sludge each year. The hydrocarbon content in these oily sludges is usually between 10 and 50%, and if they are not treated, they will cause great pollution to the environment. In view of the characteristics of high hydrocarbon content in oil and gas sludge 2 The characteristics of low viscosity, low surface tensio...

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Problems solved by technology

But the existing supercritical CO 2 The extraction process needs to continuously feed carbon dioxide from the bottom of the extraction tank during the extraction process, so that the supercritical CO 2 The extraction is completed by diffusion. Due to the influence of gravity, the porosity of the oily sludge in the batch extraction tank will decrease. At the same time, the oily sludge has the characteristics of high viscosity and sufficient emulsification. Therefore, supercritical CO 2 The flow in the oily sludge in the extraction tank will be slowed down, resulting in a longer extraction time

Secondly, the batch process adopts single-batch operation, and every time the raw material is replaced, it needs to repeatedly increase and decrease the pressure, which will cause a lot of energy loss and is not conducive to the reduction of oily sludge treatment costs; third, batch extraction After the process extraction is completed, the packing needs to be replaced regularly, and the operation during the packing replacement process is very complicated and time-consuming. Therefore, the batch extraction process has the disadvantages of complex extraction equipment and low degree of automation, which is not conducive to prying.

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