Decompression tower bottom coke inhibiting device and its uses

Abstract

The invention provides a bottom burnt-against device of pressure-relief tower, which comprises a porous baffle plate, a liquid baffle cap and a support bar plate. Wherein, the baffle plate is a cylinder whose diameter is not less than the inner diameter of extract kettle; the porous rate of said cylinder is higher than 90%; the diameter of external edge of liquid baffle cap is lager than the porous baffle plate; and the support bar plate is arranged between the liquid baffle cap and the porous baffle plate. The invention has better effect when used in quench oil distributing tubes; the burnt-against device is mounted under the stripping section and above the extract kettle, while the quench oil distributing tubes are arranged on the burnt-against device. The invention can improve the flow-ability of liquid, strengthen the turbulence, avoid the generation and accumulation of coke, and confirm the normal operation and separation effect of tower.

Description

technical field [0001] The invention relates to a distillation tower internal part, in particular to a vacuum tower bottom coke arresting device of an atmospheric and vacuum distillation device and its application. technical background [0002] Distillation column is a key equipment widely used in oil refining and petrochemical plants to separate products. The efficiency of the distillation tower is directly related to the quality of the product. [0003] In many occasions, such as the vacuum tower of the refinery, the coking fractionator, the catalytic fractionator, the oil scrubber of the ethylene plant, etc., because the feed temperature is very high, often exceeding 400 ° C, the operating temperature of the feed section and the section below the feed is also high. It is very high, and the materials in the tower are prone to thermal cracking and polymerization reactions in the high-temperature zone, producing small molecular gases and cokin...

AI Technical Summary

Problems solved by technology

[0004] The use of rapid cooling oil circulation technology can reduce the temperature of the residual oil to below 370°C, which can alleviate the coking problem to a certain extent, but it cannot be completely avoided, especially for the current vacuum deep drawing technology, the feed temperature reaches above 400°C, and the bottom slag The temperature of the oil is as high as 390°C. After the high-temperature material enters the tower, it must be in direct contact with a part of the material in the tower. At the same time, there are many dead corners of liquid flow in the tower, and the uneven mixing of the liquid in the tower kettle may also cause local overheating. In these areas Coking will still occur. Once coke is generated, it will slowly accumulate, which will affect the operation of the bottom material extraction pump and cold exchange equipment, and seriously affect the production of the device and cause shutdown

Images