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An ethylene cracking furnace

A technology of ethylene cracking furnace and furnace tube, which is applied in the direction of cracking, hydrocarbon cracking to hydrocarbon, non-catalytic thermal cracking, etc. It can solve the problems of difficult elimination and furnace tube bending, and achieve the effects of avoiding bending, simple connection and prolonging service life

Active Publication Date: 2021-01-08
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this structure, since the lower collecting pipe is rigidly connected, the expansion difference between the second pipe and the first pipe can only be adjusted by the balance system installed at the inlet of the first pipe. The expansion difference between the first pass and the second pass tube is difficult to eliminate, which will eventually cause the furnace tube to bend

Method used

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  • An ethylene cracking furnace
  • An ethylene cracking furnace
  • An ethylene cracking furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0065] The invention provides an ethylene cracking furnace, such as figure 1 As shown, the ethylene cracking furnace includes: at least one radiant section 6, a convection section 8, a transition section 7 between the radiant section and the convection section, a quench boiler 12, a high-pressure steam drum 13 and an induced draft fan 14;

[0066] Bottom burners 10 and / or side wall burners 11 are arranged in the radiant section 6, and multiple groups of radiant furnace tubes 9 are vertically arranged;

[0067] like Figure 5-1 As shown, the radiation furnace tube 9 is a two-pass 2-1 type branched and reduced-diameter radiation furnace tube, and each two-pass 2-1 type branched and reduced-diameter radiation furnace tube includes a first-pass furnace tube 1, a second-pass The furnace tube 2 and the elbow assembly formed by the symmetrical elbow 5 and the S-shaped elbow 4 connecting the first-stage furnace tube 1 and the second-stage furnace tube 2; the symmetrical elbow 5 is i...

Embodiment 2

[0072] The present invention also provides a kind of ethylene cracking furnace, such as figure 1 As shown, the ethylene cracking furnace includes: at least one radiant section 6, a convection section 8, a transition section 7 between the radiant section and the convection section, a quench boiler 12, a high-pressure steam drum 13 and an induced draft fan 14;

[0073] Bottom burners 10 and / or side wall burners 11 are arranged in the radiant section 6, and multiple groups of radiant furnace tubes 9 are vertically arranged;

[0074] like Figure 6-1 As shown, the radiation furnace tube 9 is a two-pass 2-1 type branched and reduced-diameter radiation furnace tube, and each two-pass 2-1 type branched and reduced-diameter radiation furnace tube includes a first-pass furnace tube 1, a second-pass The furnace tube 2 and the elbow assembly formed by the symmetrical elbow 5 and the S-shaped elbow 4 connecting the first-stage furnace tube 1 and the second-stage furnace tube 2; the symm...

Embodiment 3

[0080] The invention provides an ethylene cracking furnace, such as figure 1 As shown, the ethylene cracking furnace includes: at least one radiant section 6, a convection section 8, a transition section 7 between the radiant section and the convection section, a quench boiler 12, a high-pressure steam drum 13 and an induced draft fan 14;

[0081]Bottom burners 10 and / or side wall burners 11 are arranged in the radiant section 6, and multiple groups of radiant furnace tubes 9 are vertically arranged;

[0082] like Figure 7-1 As shown, the radiation furnace tube 9 is a two-pass 2-1 type branched and reduced-diameter radiation furnace tube, and each two-pass 2-1 type branched and reduced-diameter radiation furnace tube includes a first-pass furnace tube 1, a second-pass The furnace tube 2 and the elbow assembly formed by the symmetrical elbow 5 and the S-shaped elbow 4 connecting the first-stage furnace tube 1 and the second-stage furnace tube 2; the symmetrical elbow 5 is in...

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Abstract

The invention belongs to the technical field of chemical equipment, and provides an ethylene cracking furnace. The ethylene cracking furnace comprises a radiant section 6, a convection section 8, anda transition section 7; a plurality of sets of radiant furnace tubes 9 are vertically arranged in the radiant section 6; the radiant furnace tubes are double section branched radiant furnace tubes; each radiant furnace tube comprises a first section furnace tube 1, a second section furnace tube 2, and a symmetrical elbow tube 5 or an elbow tube assembly composed of a symmetrical elbow tube 5 and an S-shaped elbow tube 4; the symmetrical elbow tubes 5 are symmetrical in structures in a same plane or in space; a set of the radiant furnace tubes 9 is composed of 2 to 4 double section branched radiant furnace tubes, the first section furnace tubes 1 of the 2 to 4 double section branched radiant furnace tubes are arranged to be adjacent, the second section furnace tubes 2 of the 2 to 4 double section branched radiant furnace tubes are arranged to be adjacent, and single-line arrangement between two lines of bottom combustors is adopted, so that the first section furnace tubes 1 and the second section furnace tubes 2 are arranged continuously at intervals or in an axially symmetrical arrangement manner. The ethylene cracking furnace is capable of realizing furnace tube uniform heating, and avoiding furnace tube bending at the same time, reducing operation cost, prolonging service life, and reducing investment.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, more specifically, to an ethylene cracking furnace. Background technique [0002] The ethylene cracking technologies used in petrochemical ethylene units are mainly CBL cracking furnaces developed by American LUMMUS, Stone & Webster, Kellog & Braun Root, European German Linde, Technip (KTI) and Sinopec. [0003] The 2-1 type, 4-1 type and other furnace tubes are branch tubes. The first tube needs to be combined and connected to the second tube. Whether the design of the connection between the first tube and the second tube is reasonable depends directly on the The mechanical properties of the cracking furnace tube have an influence, that is to say whether the bending of the furnace tube can be slowed down or avoided. [0004] The German Linde company uses 2-1 two-pass furnace tubes, usually arranged in a single row, with a first-stage quenching (waste heat) boiler or a linear quenchin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/20C07C4/04C07C11/04
CPCC07C4/04C10G9/20C10G2400/20C07C11/04
Inventor 何细藕李昌力刘克刚
Owner SINOPEC ENG
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