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.

1 . A dual-flow-baffle compound gasoline fractionator of ethylene unit, comprising a tower body as well as an orifice and instruments thereof, the functional sections of the tower body being a quench oil circulation section comprising nozzle-type liquid distributors and three-dimensional compound guide-type inlet initial distributors, a medium oil circulation section comprising nozzle-type liquid distributors and high-circulation oil collecting tanks, a diesel oil separation section, and a petroleum separation section comprising nozzle-type liquid distributors, characterized in that: micro baffles, which are arranged in parallel in the vertical direction at intervals, are arranged between the nozzle-type liquid distributors and the three-dimensional compound guide-type inlet initial distributors of the quench oil circulation section, 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, the length of the symmetrical bevel edges ranges from 80 to 200 mm and the length of the vertical hems ranges from 10 to 40 mm; dual-flow trays, which are arranged in the vertical direction and have meshes with the diameter ranging from Φ18 to 24 mm, are arranged between the nozzle-type liquid distributors and the high-circulation oil collecting tanks of the medium oil circulation section; dual-flow trays, which are arranged in the vertical direction and have meshes with the diameter ranging from Φ13 to 24 mm, are arranged on the diesel oil separation section; and dual-flow trays, which are arranged in the vertical direction and have meshes with the diameter ranging from Φ13 to 18 mm, are arranged below the nozzle-type liquid distributors of the petroleum separation section. 
     
     
         2 . The gasoline fractionator according to  claim 1 , characterized in that: the micro baffles arranged equidistantly have the free section rate of 50±15% and the interlayer spacing ranging from 300 to 600 mm. 
     
     
         3 . The gasoline fractionator according to  claim 1 , characterized in that: the quench oil circulation section is provided with 10 to 16 layers of micro baffles which are arranged in parallel in the vertical direction at intervals. 
     
     
         4 . The gasoline fractionator according to  claim 1 , characterized in that: the micro baffles are supported by a space truss, the space truss is provided with a foundation beam on which pillars are distributed at intervals, both layering and horizontal support of X-direction cross beams and Y-direction cross beams are realized between the pillars and between the pillars on the periphery and the tower body, and the Y-direction cross beams of all layers horizontally support the micro baffles. 
     
     
         5 . The gasoline fractionator according to  claim 1 , characterized in that: the percentage of open area of the dual-flow tray is from 15 to 30%. 
     
     
         6 . The gasoline fractionator according to  claim 1 , characterized in that: 8 to 10 layers of the dual-flow trays of the medium oil circulation section are arranged in the vertical direction. 
     
     
         7 . The gasoline fractionator according to  claim 1 , characterized in that: 3 to 5 layers of the dual-flow trays of the diesel oil separation section are arranged in the vertical direction. 
     
     
         8 . The gasoline fractionator according to  claim 1 , characterized in that: 7 to 10 layers of the dual-flow trays of the gasoline separation section are arranged in the vertical direction. 
     
     
         9 . The gasoline fractionator according to  claim 1 , characterized in that; the dual-flow trays arranged in the vertical direction are supported by a one-bracket-supporting-multi-tray trussed beam, a middle parallel chord parallel to an upper parallel chord and a lower parallel chord is arranged between the upper parallel chord and the lower parallel chord which are both parallel to the trussed beam, and the parallel middle parallel chords are positioned symmetrically; the upper and lower parallel chords and the middle parallel chords are composed of symmetrical section steels jointed side by side, rectangular chord plates are respectively fixedly clamped between the section steels jointed side by side, a vertical rod and an oblique rod are fixedly welded at two sides of the rectangular chord plate respectively, and the parallel upper and lower parallel chords and the middle parallel chords horizontally support the dual-flow trays respectively.