Cracking furnace of boiler tube with one-way reducing diameter

A technology for cracking furnaces and furnace tubes, which is applied in the field of cracking furnaces for the production of olefins from petroleum cracking. It can solve the problems of poor selectivity and fast coking speed of 1-1 type two-pass furnace tubes, and achieve moderate operation cycle, small furnace and cracking selection. sex high effect

Active Publication Date: 2006-05-03
CHINA PETROLEUM & CHEM CORP +3
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AI Technical Summary

Problems solved by technology

[0010] In order to overcome the shortcoming of fast coking speed of millisecond furnace single-pass equal-diameter furnace tubes and poor selectivity of 1-1 type two-pass furnace tubes, and retain their respective advantages, the present invention integrates 1-1 type two-pass furnace tubes and existing single-pass furnace tubes. The advantages of the tube, the design of a single-pass variable diameter furnace tube

Method used

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  • Cracking furnace of boiler tube with one-way reducing diameter
  • Cracking furnace of boiler tube with one-way reducing diameter
  • Cracking furnace of boiler tube with one-way reducing diameter

Examples

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Effect test

Embodiment 1

[0036] A kind of cracking furnace of one-way variable-diameter furnace tube, this cracking furnace comprises: furnace body 1, high-pressure steam drum 2, convection section 3, furnace tube 4, burner 5, combustion chamber 6, waste heat boiler 7; Described furnace tube 4 is a single pass vertical furnace tube, the internal diameter of the discharge end of the furnace tube is greater than the internal diameter of the feed end. The furnace tube is fed from the lower end and discharged from the upper end. The furnace tube is connected by upper and lower sections. The total length of the furnace tube is 10m. The length ratio is 1:1. The two sections of pipes are equal-diameter pipes, the inner diameter of the inlet section is 33mm, the inner diameter of the outlet section is 41mm, and the ratio of the inner diameter of the discharge end to the inner diameter of the feed end is 1.24. The inlet section pipe has an arc section 24, that is, with a bend, which is two elbows connected to...

Embodiment 2

[0038] A kind of pyrolysis furnace of one-way variable-diameter furnace tube, the difference with embodiment 1 is: this cracking furnace has 440 furnace tubes, is divided into 10 groups, and each group has 44 furnace tubes.

Embodiment 3

[0040] A kind of cracking furnace of one-way variable-diameter furnace tube, this cracking furnace comprises: furnace body 1, high-pressure steam drum 2, convection section 3, furnace tube 4, burner 5, combustion chamber 6, waste heat boiler 7; Described furnace tube 4 is a single pass vertical furnace tube, the internal diameter of the discharge end of the furnace tube is greater than the internal diameter of the feed end. The furnace tube is fed from the lower end and discharged from the upper end. The furnace tube is connected by upper and lower sections. The total length of the furnace tube is 10m. The length ratio is 1:1. The two sections of pipes are equal-diameter pipes, the inner diameter of the inlet section is 38mm, the inner diameter of the outlet section is 41mm, and the ratio of the inner diameter of the discharge end to the inner diameter of the feed end is 1.079. The pipe in the inlet section has an arc section, that is, with a bend, which is two elbows connect...

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Abstract

The invention provides a cracking furnace for one-way variable-diameter furnace tube, special to crack oil and produce olefin industry, which comprises: a furnace body, a high-pressure steam drum, a convection section, a one-way vertical tube with inner diameter of out-feed end larger than the feed-in end, a combustor, and a waste heat boiler. This invention has longer cycle of operation and higher yield.

Description

Technical field: [0001] The invention relates to a cracking furnace, in particular to a cracking furnace used for petroleum cracking to produce olefins. Background technique: [0002] In the ethylene plant, the cracking furnace is the core equipment (see figure 1 ). In order to shorten the residence time of the cracking reaction as much as possible and increase the cracking depth at the same time, the radiant coil (furnace tube) of the cracking furnace is developed in the direction of short length and small diameter. The double-pass coil is widely used, and the single-pass radiant tube has been used. in industrial devices. [0003] The design of the radiant coil is the key to determine the cracking selectivity, improve the yield of cracked olefins and improve the adaptability to different cracking raw materials. Improving the structure of the radiant coil has become the core part of the technical development of the tubular cracking furnace. For more than 20 years, there ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/20
Inventor 何细藕王国清王子宗张利军李金科李昌力杜志国申海女薛丽敏
Owner CHINA PETROLEUM & CHEM CORP
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