Dual-flow-baffle compound gasoline fractionator of ethylene unit

Abstract

The invention discloses a dual-flaw-baffle compound gasoline fractionator of ethylene unit, a quench oil circulation section is provided with micro baffles which are arranged in parallel in the vertical direction at intervals, a vertex angle of the micro baffle ranges from 90 to 139 degrees, symmetrical bevel edges at two sides of the vertex angle of the micro baffle are provided with symmetrical vertical hems, a medium oil circulation section is provided with dual-flow trays which are arranged in the vertical direction and have meshes with the diameter ranging from Φ18 to 24 mm, a diesel oil separation section is provided with dual-flow trays which are arranged in the vertical direction and have meshes with the diameter ranging from Φ13 to 24 mm, and a gasoline separation section is provided with dual-flow trays which are arranged in the vertical direction and have meshes with the diameter ranging from Φ13 to 18 mm. The gasoline fractionator overcomes the frequent problem of polymer plugging in current plate-type fractionator, and has the prominent advantages of strong impact vibration resistance, reduced pressure of entire tower, high ethylene yield, outstanding energy-saving effect and being capable of ensuring long-term stable operation of this tower.

Description

REFERENCE TO PENDING APPLICATIONS[0001]This application claims the benefit of International Application No. PCT / CN2011 / 070724 filed Feb. 17, 2011.BACKGROUND OF THE INVENTION[0002]The invention belongs to chemical separation equipment, and more particularly to a dual-flaw-baffle compound gasoline fractionator of ethylene unit.[0003]Being leading equipment of ethylene unit, gasoline fractionator has become a symbolic embodiment of the level of chemical separation technology,[0004]The current plate-type gasoline fractionator consists of a quench oil circulation section, a medium oil circulation section, a diesel oil separation section and a gasoline separation section, the quench oil circulation section is composed of nozzle-type liquid distributors, three-dimensional compound guide-type inlet initial distributors and a large-scale baffle or an angle steel tower tray or a medium-mesh ripple dual-flow tray (Φ12 mm, similarly hereinafter), the medium oil circulation section is composed o...

AI Technical Summary

Benefits of technology

The invention is a gasoline fractionator that has two flow baffles and is used in an ethylene unit. It has three main benefits: it prevents the system from becoming blocked, it saves energy, and it makes the process more effective.

Problems solved by technology

At present, the plate-type gasoline fractionator is impacted by the following major problems throughout the world: as the diesel oil separation section is just positioned in a polymerization zone, plugging of liquid distributor or tower tray caused by polymers occurs quite often; and plugging of heat exchanger, liquid distributor or tower tray is often caused by coking matters resulted from cracking on {he quench oil circulation section.

In order to avoid the plugging described above to further advantage long-term operation, technological measures such as the addition of polymerization inhibitor, antioxidant and the like are adopted domestically and overseas in most cases, achieving great efficiency but costing tremendous expenditure, furthermore, many domestic plugging accident still occurs.

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