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Welding process of boss of hydrogenation reactor

A technology of hydrogenation reactor and welding process, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc. Solving problems such as welding quality and other problems, to achieve the effect of weakening the dilution of the base metal, saving production time and shortening production time

Active Publication Date: 2013-06-26
青岛兰石重型机械设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing boss welding process, it takes a long time to level and align the cylinder of the hydrogenation reactor, and the accuracy is low, which affects the quality of the boss welding and finally affects the quality of the hydrogenation reactor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Taking a cylinder made of 2.25Cr-1Mo, with a thickness of 144mm and an inner diameter of ?4200mm as an example, the following steps are included:

[0021] (1) After the barrel joint is rolled and corrected and the flaw detection is qualified, the end port of the barrel joint is processed flat, and the position of the boss to be surfacing is drawn on the side away from the processed port of the barrel joint, and the surface to be surfacing is polished (the convex to be surfacing platform position and 200mm on both sides), so that the surface to be surfacing meets the requirements of flaw detection, and carry out dimensional inspection; then conduct 100% MT inspection on the surface to be surfacing, and pass the level I in JB / T4730.4-2005, according to SA578 Carry out 100% UT scanning on the surface to be surfacing and the base layer of the cylinder within 200mm on both sides, and the grade C is qualified;

[0022] (2) The Cr-Mo steel part of the surfacing weldi...

Embodiment 2

[0028] Example 2 Taking the material 2.25Cr-1Mo-0.25V, the thickness of 122mm, and the inner diameter of 2000mm as an example, the following steps are included:

[0029] (1) After the barrel joint is rolled and rounded and the flaw detection is qualified, the end port of the barrel joint is processed flat, and the position of the boss to be surfacing is drawn on the side away from the processed port of the barrel joint, and the surface to be surfacing is polished (the convex to be surfacing is platform position and 200mm range on both sides), so that the surface to be surfacing meets the requirements of flaw detection, and carry out dimensional inspection; then conduct 100% MT inspection on the surface to be surfacing, and pass the level I in JB / T4730.4-2005, according to JB / T4730 Conduct 100% UT scanning on the surface to be surfacing and the base layer of the cylinder within 200mm on both sides, and the grade I is qualified;

[0030] (2) The Cr-Mo-V steel part of the surfac...

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Abstract

The invention relates to a welding process of a boss of a hydrogenation reactor. A port in one end of a cylindrical shell section is processed flatly after coiling, circle checking and flaw detection of the cylindrical shell section are qualified; and then a surfacing position of the boss is marked, and thus the trouble that a cylinder body is firstly leveled and then overturned for surfacing the boss when the boss is surfaced is avoided, the leveling procedure during processing of the boss is avoided, therefore the production time is saved, the levelness of the boss is ensured, and the purpose of ensuring the welding quality of the boss is achieved.

Description

technical field [0001] The invention relates to a welding process for pressure vessel inner parts in the field of petrochemical equipment, in particular to a welding process for a boss of a hydrogenation reactor. Background technique [0002] The hydrogenation reactor is the key equipment of the modern oil refining industry. This equipment is mainly used in petroleum refining, heavy oil hydrocracking, hydrofinishing, catalytic reforming, desulfurization, and heavy metal removal processes. With the development of petroleum industry equipment towards automation and large-scale, the size of the hydrogenation reactor used is also getting larger and larger. In large-scale hydrogenation reactors and similar pressure vessel equipment, in order to support heavier internal parts (such as grids, distribution plates, etc.), most of them need to surfacing bosses on the inner wall of the cylinder of the hydrogenation reactor. [0003] The levelness and position of the boss will affect t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P17/00B23K9/04
Inventor 王天先王文利王伟李雪赵沛雄类成龙韩玉改张蕾吴瑞萍
Owner 青岛兰石重型机械设备有限公司
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