Cracking furnace with double-row arranged radiant section furnace tubes

A radiant furnace tube and cracking furnace technology, which is applied in the direction of hydrocarbon cracking, hydrocarbon production, organic chemistry, etc., can solve the problems affecting the radial temperature distribution of the furnace tube and the bending of the furnace tube, so as to eliminate the problem of uneven heating, shorten the length and save energy. The effect of footprint

CN101723785BActive Publication Date: 2013-06-05CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2013-06-05

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Patent Text Reader

Abstract

The invention relates to an ethylene cracking furnace. The radiant furnace tube of the cracking furnace of the invention is a two-pass vertical furnace tube; the furnace tube is arranged in two rows, a first pass tube is connected with a second pass tube by a return bend pipe, and both the orthographic projection and the profile projection of the return bend pipe are U-shaped; and the first pass tube and the second pass tube of each radiant furnace tube are arranged in a plane A and a plane B. The cracking furnace of the invention has the advantages that the structure of the furnace tube is simple; as the first pass tube and the second pass tube of the radiant furnace tube are connected by the return bend pipe, the furnace tube is symmetrical and simple in structure and has better mechanical property; as a plurality of furnace tubes can be arranged in the hearth, the method is applicable to the capacity expansion reconstruction of the conventional cracking furnace, which can save investment, and finally fulfills the aim of improving the economic benefit.
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Description

technical field

[0001] The invention relates to an ethylene cracking furnace. Background technique

[0002] In the ethylene plant, the cracking furnace is the core equipment. The design of the radiant coil is the key to determine the cracking selectivity, increase the olefin yield of cracked products and improve the adaptability to different cracking raw materials. Improving the structure and arrangement of radiant coils has become the core part of the development of tubular cracking furnace technology. For more than 20 years, there have been radiant coils with different structures such as single-row branch reducer, mixed-row branch reducer, non-branch reducer, and single-pass equal-diameter pipe.

[0003] In order to greatly reduce raw material consumption, maintain an appropriate operating cycle and have better raw material adaptability, most companies currently use two-pass (18-28m) branch variable diameter or two-pass variable diameter high-selectivity furnace tubes, w...

Examples

Embodiment Construction

[0045] As shown in the attached picture:

[0046] figure 2 It is a schematic top view of a group of 2-1 type furnace tube arrangement of the present invention. It consists of 8 radiation furnace tubes, in which the first pass tube 1 is arranged together, and the second pass tube 2 is arranged together; the first pass tube 1 is arranged on the left side of plane A and plane B, and the second pass The pipe 2 is arranged on the right side of plane A and plane B. Plane A and plane B are symmetrical to plane C.

[0047] image 3 The arrangement of the furnace tubes is a group of 8 radiant furnace tubes, in which the first tube 1 is arranged on the left side of plane A and plane B, and the second tube 2 is arranged on the right side of plane A and plane B side. The connecting pipes between the first-pass pipe and the second-pass pipe are arranged in upper and lower layers. The connecting pipes of each layer are projected as a set of parallel lines when viewed from above, and t...