Cracking furnace for cracking hydrocarbon steam to prepare ethylene

Abstract

The invention relates to a cracking furnace for cracking hydrocarbon steam to prepare ethylene. In a radiation section of the ethylene cracking furnace, two-stroke unbranched reducing furnace pipes or branched reducing furnace pipes are adopted; the first-stroke furnace pipes are arranged in two rows; the second-stroke furnace pipes are arranged in a single row; the first-stroke furnace pipes and the second-stroke furnace pipes are positioned on three planes respectively; the two planes of the first-stroke furnace pipes are symmetric with the plane of the second-stroke furnace pipes; the three planes are parallel with one another, or the two planes of the first-stroke furnace pipes and the plane of the second-stroke furnace pipes form the same included angle and the upper end spacing is smaller than the lower end spacing; and the two-stroke furnace pipes are connected with one another through symmetric bent pipes or bent pipes and S-shaped pipe combined connecting pieces. The first-stroke furnace pipes and the second-stroke furnace pipes can adopt strengthened heat transfer member units according to conditions, so that the operation cycle of the cracking furnace and the service life of the furnace pipes can be further prolonged. The cracking furnace for cracking the hydrocarbon steam to prepare the ethylene has small size of the radiation section, contributes to reducing occupied area and saving investment, and can be applied to new construction of the cracking furnaces or energy expansion reformation of the cracking furnaces.

Description

Technical field [0001] The invention belongs to the field of petrochemical industry, and specifically relates to a furnace tube structure of an ethylene cracking furnace in petrochemical production. Background technique [0002] The ethylene cracking technology used in the petrochemical ethylene plant is mainly the CBL cracking furnace developed by LUMMUS, Stone&Webster, Kellog & Braun Root, Linde, Technip (KTI) and Sinopec in Europe. Their technologies are as follows: [0003] American LUMMUS company: use 4-1, 5-1, 6-1 and other two-pass furnace tubes, usually four groups of furnace tubes are equipped with a quench (waste heat) boiler; [0004] US Stone&Webster company: U-shaped furnace tubes are used, usually one or two groups of furnace tubes are equipped with a linear quench (waste heat) boiler, and all bottom heating is provided; [0005] American Kellog & Braun Root Company: U-shaped or single-pass furnace tubes are used, usually one or two groups of U-shaped furnace tubes are ...

AI Technical Summary

Problems solved by technology

[0014] The present invention aims to solve the problems of large land occupation and high investment of cracking furnaces in the prior art, and at the same time overcome the defects of furnace tubes arranged in double rows, so as to improve the online rate of cracking furnaces, reduce operating costs and prolong the service life of furnace tubes. To achieve the purpose of improving economic efficiency

Images