Method for solving problem of asphaltene coking in residual oil

Abstract

The invention discloses a method for solving the problem of asphaltene coking in residual oil and relates to the technical field of equipment decoking. A coating is sprayed to a device and a pipelinewhich are easy to coke. The coating is a high-temperature-resistant anti-sticking nano composite ceramic coating and has the characteristics of being resistant to high temperature, capable of preventing asphaltene sticking, resistant to wear and resistant to corrode, so that the sticking of asphaltene in the residual oil to the equipment and the pipeline is avoided. Compared with other anti-cokingmethods, for example, device equipment is filled with a chemical agent and a scale inhibitor, or the coked equipment is cleaned, by the adoption of the method, the effect of preventing coking of thedevice is more remarkable, the operation is convenient, safety and environment protection are achieved, and the labor amount is saved, so that the device can operate for a long period, and great economic benefits are brought to enterprises.

Description

technical field [0001] The invention relates to the technical field of equipment decoking, in particular to a method for solving asphaltene coking in residual oil and a coating thereof. Background technique [0002] In the process of heavy oil refining in petrochemical and coal chemical industries at home and abroad, there are problems such as coking, deposition and fouling of equipment, such as residual oil hydrogenation, coal tar hydrogenation, coal direct liquefaction and coal indirect liquefaction, etc. There are different degrees of asphaltene and colloidal coking problems. Among them, in the process of refining residual oil, equipment coking is more serious. The following mainly describes the coking situation of residual oil hydrogenation process. [0003] The residual oil hydrogenation process is the main technology for refining heavy oil at present. The residual oil refining includes ebullating bed, suspension bed and fixed bed residual oil hydrogenation technology p...

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Problems solved by technology

[0003] The residual oil hydrogenation process is the main technology for refining heavy oil at present. The residual oil refining includes ebullating bed, suspension bed and fixed bed residual oil hydrogenation technology processes. In all three processes, there is the coking problem of the equipment. Due to the boiling Bed and suspension bed residual oil hydrogenation conversion rate is relatively high, reaching more than 80%. The residual oil contains a large amount of asphaltenes and colloids, so that the four-component balance of the residual oil is broken after the reaction, and asphaltenes that are difficult to convert Precipitation in the fractionation section causes a large amount of coking of asphaltenes in the fractionation section of the unit, causing blockage, scaling and deposition of pipelines and equipment, affecting the long-term operation of the unit, and increasing the consumption of additives and the cost of on-site coke cleaning The amount of labor has greatly increased the investment cost of the enterprise, and also increased the safety risk during the operation of the device. In this case, a method of using coating to solve the asphaltene coking in residual oil was invented

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