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Radiating furnace tube configuration

A technology for radiating furnace tubes and furnace tubes, which is applied in the petrochemical field, can solve the problems such as the inability to achieve rapid heating of the furnace tubes in the first pass, the short operation period of the cracking furnace, and the influence of the temperature distribution of the tube wall. High specific surface area, the effect of reducing the temperature difference between the pipe walls

Active Publication Date: 2014-08-06
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the specific surface area and pipe diameter of the first-pass tube and the second-pass tube have a large difference, the overall heating of the furnace tube will be uneven, which will affect the temperature distribution of the tube wall and shorten the operation period of the cracking furnace; if the first-pass furnace tube and the second-pass tube If the difference between the specific surface area and tube diameter of the second-pass furnace tube is too small, the rapid temperature rise of the first-pass furnace tube and the coking effect of the second-pass furnace tube cannot be achieved.

Method used

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  • Radiating furnace tube configuration
  • Radiating furnace tube configuration
  • Radiating furnace tube configuration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] like Figure 2-1 to Figure 2-3 As shown, two sets of 3-2 branch furnace tubes are used, in which the first tube is arranged on both sides of the second tube, the first tube is arranged in a single row, and the second tube is arranged in a single row. The angle between the furnace tube centerline plane of the first-pass tubes arranged in a single row and the centerline 10 of the radiation heat transfer zone is 0 degrees (when this angle is 0 degrees, the first-pass tubes are parallel to the length direction of the radiation heat transfer zone, At this time, it occupies the largest space and the heat exchange effect is the best; when the angle is 90 degrees, the arrangement direction of the first-pass tubes is perpendicular to the radiation heat transfer area, and the space occupation is the smallest, and the heat exchange effect is not good. Therefore, the design of this angle, in Different angles can be selected in the actual application process.

[0060] The total num...

Embodiment 2

[0062] like Figure 3-1 to Figure 3-3 As shown, two sets of 3-2 branch furnace tubes are used, in which the first pass tubes are arranged on both sides of the second pass tubes, the first pass tubes are arranged in a single row, and the second pass tubes are arranged in a staggered manner, that is, two adjacent The furnace tubes are parallel, but the center lines are not in a plane. The included angle between the centerline plane of the furnace tube and the centerline of the radiation heat transfer zone of the first-pass tubes arranged in a single row is 0 degree.

[0063] The total number of second-pass tubes is 4, the total number of first-pass tubes is 6, and 3 tubes are arranged on both sides of the second-pass tube. A five-way pipe fitting is installed at the bottom of the first pass pipe to change the number of flow channels from 3 to 2 flow passages. At the same time, the five-way pipe fitting acts as a return bend pipe, and the second pass pipe is arranged in a stagge...

Embodiment 3

[0065] like Figure 4-1 to Figure 4-3 As shown, two 3-2 type branch furnace tubes are used, in which the first tube is arranged on both sides of the second tube, the first tube is staggered, and the second tube is staggered.

[0066] The total number of second-pass tubes is 4, the total number of first-pass tubes is 6, and 3 tubes are arranged on both sides of the second-pass tubes. A five-way fitting is installed at the bottom of the first pass pipe to change the number of flow channels from 3 to 2, and the five-way fitting acts as a return bend.

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Abstract

The invention provides a radiating furnace tube configuration, and belongs to the field of petrochemical engineering. The radiating furnace tube configuration comprises at least one group of 3-2 type furnace tubes; each group of 3-2 type furnace tubes comprises first pass tubes (1) and second pass tubes (2); the ratio of the number of furnace tubes included in the first pass tubes (1) to the number of furnace tubes included in the second pass tubes (2) is 3:2. The radiating furnace tube configuration overcomes the limitation of 1-1 type and 2-1 type furnace tubes in arrangement, the arrangement of the furnace tubes at a specified hearth size has more choices, moreover, a high specific surface area characteristic of the first pass tubes is guaranteed, the tube wall temperature difference between the first pass tubes and the second pass tubes is reduced, high temperature deformation of conventional two-pass furnace tubes is improved, and further the operation cycle of a cracking furnace is prolonged.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a radiation furnace tube configuration used in cracking furnaces of ethylene plants in petrochemical production. Background technique [0002] The ethylene cracking technologies used in petrochemical ethylene units are mainly LUMMUS, Stone & Webster, Kellog & Braun Root in the United States, Linde in Germany, Technip (KTI) in Europe, and CBL cracking furnaces developed in China. Regarding the radiant coil configuration of ethylene cracking furnace, the two-pass furnace tubes of each company have their own characteristics, as follows: [0003] American LUMMUS company: using 4-1, 5-1, 8-1 and other two-pass furnace tubes; [0004] American Stone&Webster company: using 1-1 (U) type furnace tube; [0005] American Kellog&Braun Root Company: U-shaped furnace tube is adopted; [0006] German Linde company: using 2-1 two-pass furnace tube; [0007] Technip (Netherla...

Claims

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Application Information

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IPC IPC(8): C10G9/20C07C11/04C07C4/04
Inventor 孙向军李光刘敬坤郭玉萍刘克刚薛磊李森李昌力胡鸣袁慕军门宽亮高景芬张艳
Owner CHINA PETROCHEMICAL CORP