Two-range radiant section furnace tube used for ethylene cracking furnace

Abstract

The invention discloses a two-range radiant section furnace tube used for an ethylene cracking furnace. The furnace tube is a two-range vertical furnace tube. The number of a first-range furnace tube is 2, and the number of a second-range furnace tube is 1. Two first-range furnace tubes are connected by an arced collection tube, the upper two tube orifices of which are connected to the two first-range furnace tubes respectively. The lower tube orifice of the collection tube is connected to a bent tube, the other end of which is connected to the second-range furnace tube. The two-range radiant section furnace tube provided by the invention can eliminate the additional force generated by deformation of a furnace tube bottom connecting piece to a radiation furnace tube, thus avoiding bending deformation of the radiation furnace tube, prolonging the operation cycle of a cracking furnace, and extending the service life of furnace tubes. Meanwhile, due to adoption of the arced collection tube and the bent tube, reaction materials in the tube have small flow rate fluctuation, no flow retention area appears, and the residence time of materials in the tube is reduced. The two-range radiant section furnace tube provided by the invention is in favor of hydrocarbon cracking reaction, and improves the yield of objective products.

Description

technical field [0001] The invention relates to the field of ethylene cracking furnaces, and more particularly, relates to a two-pass radiation section furnace tube used in the ethylene cracking furnace. Background technique [0002] The ethylene tubular cracking furnace is the core device in the current ethylene production. In recent years, my country's ethylene production has continued to increase. As of 2011, the total annual production of ethylene in my country has exceeded 15 million tons. During the "Twelfth Five-Year Plan" period, 800,000 tons of ethylene per year in Chengdu, Sichuan, 800,000 tons of ethylene per year in Wuhan, 1 million tons of ethylene per year in Fushun, and 1.2 million tons of ethylene per year in Daqing will all be put into operation one after another. Technological progress in this field will bring huge economic efficiency and social benefits. [0003] The world's patentees who develop ethylene tube cracking furnace technology include ABB Lummu...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of the connection structure and arrangement of several existing furnace tubes in the radiant section, some furnace tubes such as manifolds, bent tubes, and straight tubes are unevenly heated, resulting in bending deformation, shortening the service life of the furnace tubes, and shortening the operating cycle of the cracking furnace. Problem, the present invention provides a two-pass radiation section furnace tube for ethylene cracking furnaces, using arc-shaped manifolds and bends to connect the first-pass furnace tube and the second-pass furnace tube, eliminating the impact of radiation on the bottom of the furnace tube due to deformation of the connecting piece The additional force of the furnace tube avoids the bending and deformation of the radiant furnace tube, prolongs the operating cycle of the cracking furnace and prolongs the service life of the furnace tube. There is a flow stagnation area, which reduces the residence time of the material in the pipe, is beneficial to the cracking reaction of hydrocarbons, and improves the yield of the target product

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