A device and method for preparing coke by simulating the delayed coking process of carbonaceous macromolecules by rapid coking

Abstract

The invention discloses a device for simulating quick preparation of coke samples by means of carbon-base macromolecules under different coking conditions. The device comprises a reaction still and a heating furnace, wherein the reaction still is located in a cavity of the heating furnace, a reaction still cover used for sealing the reaction still is arranged at the upper end of the reaction still, and an air outlet is formed in the reaction still cover and connected with a backpressure valve through an air outlet pipeline; a raw material inlet and a circulation oil inlet are formed in the annular wall of the reaction still and connected with a raw oil tank and a circulation oil tank through pipelines respectively; an air inlet is formed in a bottom cover of the reaction still and connected with an air supply system through an air inlet pipeline; the heating furnace is connected with a program temperature controller. The invention further discloses a method for simulating preparation of coke samples by means of carbon-base macromolecules under different coking conditions with the device. By the adoption of the device and method, quick preparation of coke samples from carbon-base macromolecules can be achieved under different conditions, and the influence of different coking conditions on coking morphology of coke samples can be researched.

Description

technical field [0001] The invention belongs to the technical field of heavy oil thermal processing, and in particular relates to a device and method for preparing coke by simulating the delayed coking process of carbonaceous macromolecules by rapid coking. Background technique [0002] The world's crude oil resources are increasingly heavy and inferior, especially coupled with the cost advantages brought about by processing heavy crude oil, resulting in about 42% of the world's petrochemical refining companies (US: even up to 2 / 3 refining companies) It tends to increase the proportion of heavy crude oil in processed raw materials, and the quantity of heavy oil such as residual oil, FCC oil slurry, and ethylene tar produced will inevitably increase accordingly. These heavy oils either have high metal content, high heteroatom (sulfur, nitrogen, oxygen) content, or are rich in aromatics and olefin structures, and have poor stability. They are all low-quality heavy oils that ar...

AI Technical Summary

Problems solved by technology

The generation of shot coke in the coking process of heavy oil will bring a series of production and safety problems: when the bottom cover of the coke tower is removed, the loose structure of the shot coke makes it difficult to control the pouring process; the coke bed mainly composed of shot coke is difficult to cool, After cold coking, the local temperature is still too high; accidental landslides during coke cleaning and high-temperature materials in the coke layer pose a greater safety threat to on-site operators; during the production process, the coke tower produces "swelling" phenomenon , resulting in abnormal shaking of the tower body, forming a safety hazard

Using an autoclave to simulate the coking heat process to prepare coke samples, the main problem is that the deviation from the actual delayed coking process increases. For example, it is difficult to control the pressure of the conversion process in an autoclave, and the coke formation characteristics are greatly affected by the inability to simulate the coking process. Airflow escape, shearing, agitation and impact effects, and it is also impossible to implement circulating oil injection in the coking process of heavy oil

The medium-scale coking method is too cumbersome. It is time-consuming and labor-intensive to prepare a coking sample, and it is difficult to prepare it quickly for subsequent analysis and characterization quickly. At the same time, it is not economical.

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