Auxiliary fractional tower and its gasoline catalyzing and olefine reducing modification process

Abstract

The invention discloses an auxiliary fractionation tower and its catalytic gasoline olefin-reducing modification method. The tower body is equipped with 16 trays, and the whole tower body is divided into 17 layers. The 17th layer is equipped with a herringbone baffle, and It is equipped with reaction oil and gas inlet, stirring steam inlet, oil slurry inlet, oil slurry outlet, the 16th tray is equipped with a middle section and a diesel outlet, and the 13th tray is equipped with a middle section return feed The fourth tray is provided with a top circulation outlet, the first tray is provided with a top reflux feed inlet and a top circulation return tower feed inlet, and the top of the tower body is connected to a separator tank through a heat exchanger. The structure of the tower is simplified, and the catalytic gasoline olefin reduction modification method realized establishes a new heat exchange process that uses the heat of the fractionation system to heat the crude gasoline step by step, which realizes the optimization of system energy consumption and reduces the yield of coke and dry gas. The energy quality and heat utilization efficiency of the gasoline reforming process are improved, and the device energy consumption of the auxiliary fractionation system is reduced.

Description

technical field [0001] The invention relates to the technical field of heavy oil catalytic cracking in the oil refining industry, in particular to an auxiliary fractionation tower and a catalytic gasoline olefin-reducing upgrading method thereof. Background technique [0002] In the secondary processing technology of my country's oil refining industry, the catalytic cracking process occupies an extremely important position. Most of the gasoline and diesel in the domestic market come from catalytic cracking; 1 / 3 of the total energy consumption of the refining unit. In order to meet the requirements of increasingly heavy crude oil, stricter oil quality indicators and more diesel, propylene and liquid hydrocarbons, the research and application of new catalytic cracking technologies have been very active in recent years. "Catalytic gasoline auxiliary reactor modification and olefin reduction technology" is an example. The goal of this technology is to reduce the olefin content ...

AI Technical Summary

Problems solved by technology

[0005] 2. The heat of the mid-section reflux is also seriously downgraded

[0006] 3. Part of the top cycle heat at a suitable temperature is not used, which not only causes heat loss, but also increases the cooling load of the system

In the existing process, in order to ensure the temperature of the top cycle returning to the tower, air cooling is used as an adjustment means to directly cool the top cycle at 95°C after a heat exchange with deoxygenated water to 80°C and return to the tower, about 100×104Kcal / h calories are wasted

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