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Treatment method for quench boiler tube inner surface

A technology for rapidly cooling boilers and inner surfaces, applied to lighting and heating equipment, etc., can solve problems such as coking, and achieve excellent results

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a new method for treating the inner surface of the quenching boiler furnace tube in order to overcome the serious defect of the existing quenching boiler furnace tube inner surface coking

Method used

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  • Treatment method for quench boiler tube inner surface
  • Treatment method for quench boiler tube inner surface
  • Treatment method for quench boiler tube inner surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment is used to illustrate the method provided by the present invention for treating the inner surface of the furnace tube of a quenched boiler.

[0027] size is The inner surface of the 15Mo3 alloy furnace tube is bright and free of scale after machining. The furnace tube is processed according to the method of the present invention, specifically, hydrogen gas with a pressure of 0.1 MPa is passed into a chromic acid aqueous solution with a temperature of 10° C. and a concentration of 30% by weight to obtain hydrogen gas containing chromic acid, and then Pass it into a high-temperature furnace tube at 900°C, and treat at a constant temperature for 30 hours. After cooling, the element composition of the inner surface of the furnace tube was analyzed by X-ray energy dispersive spectrometer, and the results are shown in Table 1.

[0028] Use this furnace tube on the laboratory device of 200g / h feed rate, take naphtha (property see table 2) as cracking raw mat...

Embodiment 2

[0031] This embodiment is used to illustrate the method provided by the present invention for treating the inner surface of the furnace tube of a quenched boiler.

[0032] The size and material of the furnace tube used in this embodiment are the same as those in Embodiment 1. The furnace tube is processed according to the method of the present invention. Specifically, CO with a pressure of 0.15 MPa is introduced into a chromic acid aqueous solution having a concentration of 10% by weight at 70° C. to obtain carbon monoxide gas containing chromic acid, which is then passed through Put it into a high-temperature furnace tube at 1000°C, and treat it at a constant temperature for 20 hours. After cooling, the element composition of the inner surface of the furnace tube was analyzed by X-ray energy dispersive spectrometer, and the results are shown in Table 1.

[0033] Using the method and conditions of Example 1, the furnace tube was subjected to 5 cycles of pyrolysis and charring...

Embodiment 3

[0035] This embodiment is used to illustrate the method provided by the present invention for treating the inner surface of the furnace tube of a quenched boiler.

[0036] The size and material of the furnace tube used in this embodiment are the same as those in Embodiment 1. The furnace tube is processed according to the method of the present invention, specifically, the pressure is 0.2MPa N 2 Pass into 0 DEG C, concentration is the chromic acid aqueous solution of 20% by weight, obtain the nitrogen gas containing chromic acid, then pass it into the high-temperature furnace tube of 700 DEG C, constant temperature treatment for 60 hours. After cooling, the element composition of the inner surface of the furnace tube was analyzed by X-ray energy dispersive spectrometer, and the results are shown in Table 1.

[0037] Using the method and conditions of Example 1, the furnace tube was subjected to 5 cycles of pyrolysis and charring experiments, and the coking amounts of different...

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Abstract

Relating to the research field of boiler tube inner surface treatment methods, the invention discloses a treatment method for a quench boiler tube inner surface. Specifically, the method includes: using a low oxygen partial pressure gas containing chromic acid to treat a quench boiler tube inner surface so as to form an oxide film on the boiler tube inner surface. The method provided by the invention has simple process, the formed oxide film can effectively cover the Fe element on the quench boiler tube inner surface, and the coke deposited on the quench boiler tube inner surface can be reduced by more than 70%.

Description

technical field [0001] The invention relates to the research field of a method for processing the inner surface of a furnace tube, in particular to a method for processing the inner surface of a quenching boiler furnace tube. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry, and ethylene output is the main symbol to measure the development level of a country's petrochemical industry. Currently, tube furnace cracking technology is the main method for producing ethylene, and coking on the inner wall of the heat exchange tube of the quenching boiler is a prominent problem during the operation of the cracking unit. Especially, when the cracking raw material is heavy oil (such as heavy AGO, VGO, etc.), the coking of the quench boiler is more serious, and constitutes the main restricting factor of the cracking unit's operation cycle. In order to ensure the smooth flow of logistics, the cracking furnace has to be...

Claims

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Application Information

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IPC IPC(8): C23F14/02F23J7/00
Inventor 王申祥王国清郏景省王红霞
Owner CHINA PETROLEUM & CHEM CORP
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