Cracking furnace with novel furnace tube layout

Abstract

The invention provides a cracking furnace with a novel furnace tube layout. The cracking furnace comprises a convection section arranged on the right-upper side of a radiation section and communicatedwith the radiation section, a plurality of groups of radiation furnace tubes vertically arranged in the radiation section, and a plurality of combustors arranged in the radiation section, wherein tube bundles formed by the plurality of groups of radiation furnace tubes are arranged in the middle part of a hearth in the radiation section of the cracking furnace; lateral combustors are symmetrically arranged on the bottom and sidewall of the hearth located around the tube bundles; each group of furnace tubes in the tube bundle are uniformly distributed on the circumference of a circle or oval with the center of the tube bundle as the center of the circle or oval; and a plurality of bottom combustors are arranged at the center of each tube bundle. Thus, the occupied area of the cracking furnace per unit production capacity is reduced; difficulties in arrangement of the furnace tubes are reduced, and each group of furnace tubes maintains a same structure; and thus, each group of furnace tubes in the cracking furnace is allowed to have same reaction conditions as much as possible.

Description

technical field [0001] The invention relates to a cracking furnace used for petroleum cracking, in particular to a cracking furnace with a novel arrangement of furnace tubes. Background technique [0002] Low-carbon olefins such as ethylene, propylene and butadiene are important basic raw materials for the petrochemical industry. At present, the method for producing low-carbon olefins is mainly based on the tube furnace petroleum hydrocarbon steam cracking process. According to statistics, about 99% of ethylene, more than 50% of propylene and more than 90% of butadiene in the world are produced through this process. [0003] The core equipment of the tubular furnace petroleum hydrocarbon steam cracking process is the tubular cracking furnace (hereinafter referred to as the "cracking furnace"). When the cracking raw materials such as ethane, propane, naphtha and hydrogenated tail oil are heated to high temperature in the cracking furnace , a carbon chain scission chemical r...

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Problems solved by technology

The second is that the radiation heat transfer of the furnace wall of the cracking furnace has no difference for the furnace tube row, that is, the heat transfer area of ​​the furnace wall of the cracking furnace is the same for both the inlet tube row and the outlet tube row, and for areas with large heat flux and The same is true for the area with small heat flux, which will lead to uneven local heating of the cracking furnace, which will cause the local temperature of the furnace tube to be too high and reduce the operating cycle of the cracking furnace

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