Plate-fin film type main cold liquid distributor for air separation

Abstract

The invention provides a plate-fin film type main cold liquid distributor for air separation. The plate-fin film type main cold liquid distributor comprises a pre-distribution structure, a primary distribution structure, a secondary distribution structure, an oxygen storage groove, oxygen containing grooves, overflow holes, liquid outlets and pressure equalizing holes. Primary distribution of liquid oxygen is realized by the pre-distribution structure and the primary distribution structure; re-distribution of the liquid oxygen is realized by the secondary distribution structure; a plurality of the overflow holes are uniformly arranged on separation boards at the both sides of the upper part of the oxygen storage groove along a width direction at intervals with a pre-set distance; all the overflow holes are located at the same horizontal height; the liquid outlet is arranged at one side of the bottom of each oxygen containing groove; and one pressure equalizing hole is arranged at one side at the upper part of each oxygen containing groove. With the adoption of the structure, the liquid oxygen flow of each evaporation channel can assured uniform, so as to achieve good film distribution effect inside the evaporation channels. Furthermore, the heat transmission property of a main condensing evaporator is improved, and the main cold security problems can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of liquid distributors for condensing evaporators, in particular to an air separation plate-fin type film-type main cooling liquid distributor. Background technique [0002] In the rectification system of the cryogenic air separation plant, the condensing evaporator is the key heat exchange equipment connecting the upper and lower towers. Its structure and heat transfer performance have a direct impact on the energy consumption, separation efficiency and capital investment of the air separation plant. Compared with the bath-type main cooling, the heat transfer temperature difference of the membrane main cooling is small, which can reduce the pressure of the lower tower, the heat transfer coefficient K value is significantly increased, and the energy saving effect is remarkable, and the structural size of the membrane main cooling is significantly reduced. It is convenient for transportation, therefore, falli...

AI Technical Summary

Problems solved by technology

[0004] There are two main criteria to measure the structure of air separation membrane main cooling liquid distributor: one is the uniformity of liquid oxygen flow in each evaporation channel, and the other is the effect of film distribution inside a single evaporation channel. At present, for air separation membrane In terms of the structural design of the type main cooling liquid distributor, more emphasis is placed on ensuring a good film distribution effect of a single evaporation channel. However, if the liquid oxygen flow rate of each evaporation channel is uneven, it is difficult to obtain a good film distribution effect. It will affect the heat transfer performance of the main cooling, and even cause safety problems of the main cooling

For example, the uneven distribution of liquid oxygen flow in each evaporation channel may lead to excess liquid oxygen in some evaporation channels, while dry evaporation occurs in other evaporation channels with too little liquid oxygen. 2 O, etc. will precipitate on the wall of the evaporation channel, and then block the channel, causing hydrocarbons to concentrate, precipitate, and accumulate, increasing the risk of explosion

Images