Flow crossing-baffling composite gasoline fractionating tower of ethylene device

Abstract

The invention discloses a flow crossing-baffling composite gasoline fractionating tower of an ethylene device. Micro baffling plates which are arrayed in an interlaced manner are arranged in parallel up and down at a quenching oil circulating section, and a vertex angle of each micro baffling plate is within 90 to 139 DEG; symmetrical bevel edges at the two sides of the vertex angle of the baffling plate are provided with symmetrical vertical folded edges; flow-crossing sieve plates with the diameter of sieve holes within Phi18 to 24mm are arrayed up and down at a medium oil circulating section; flow-crossing sieve plates with the diameter of the sieve holes within Phi13 to 24mm are arrayed up and down at a diesel oil separating section; and flow-crossing sieve plates with the diameter of sieve holes within Phi13 to 18mm are arrayed up and down at a gasoline separating section. The gasoline fractionating tower of the invention overcomes the problem of polymer blockage frequently occurring in the present plate-type fractionating tower and has the remarkable advantages of strong impact and vibration resisting capability, low tower pressure, high ethylene yield, obvious energy saving effect and long-term stable running.

Description

technical field [0001] The invention belongs to chemical separation equipment, in particular to a cross-flow-baffle composite gasoline fractionation tower for an ethylene plant. Background technique [0002] The gasoline fractionation tower is the leading equipment of the ethylene plant, and it is a symbolic embodiment of the level of chemical separation technology. [0003] The existing plate type gasoline fractionation tower is composed of a quenching oil circulation section, a medium oil circulation section, a diesel separation section and a gasoline separation section. Baffle plates or angle steel trays or medium-hole corrugated through-flow sieve plates (φ12mm, the same below), the medium oil circulation section consists of nozzle-type liquid distributors, high circulation oil collection tanks and fixed valve trays or angle steel trays or The medium-hole corrugated through-flow sieve plate is composed of the diesel separation section composed of fixed valve trays or me...

AI Technical Summary

Problems solved by technology

[0004] At present, the plate gasoline fractionation tower has the following major worldwide problems: the diesel oil separation section is just in the polymerization zone, and the polymer often blocks the liquid distributor or tray; the coke produced by the cracking of the quenching oil circulation section often blocks the heat exchange process Distributors, liquid distributors or trays

[0005] In order to avoid the above-mentioned clogging and facilitate long-term operation, many technological measures such as adding polymerization inhibitors and antioxidants are adopted at home and abroad. Although it is effective, it costs a lot of money, and there are still many clogging accidents in China.

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