Multi-nozzle oppositely-arranged type gasifier nozzle mounting flange installing and welding method
A technology for installing flanges and gasifiers, which is applied in the field of flange welding and multi-nozzle opposed gasifier burners. Large deviation and other problems, to achieve the effect of good anti-deformation effect, good quality, reasonable form and structure
Active Publication Date: 2015-03-11
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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Problems solved by technology
In this method, since there are no effective positioning measures for the assembly of the flange, and only ordinary and simple anti-deformation tooling is used to prevent the welding deformation of the flange, the welded flange due to the assembly accuracy and welding deformation Factors, usually the final deviation is relatively large
[0004] Therefore, for the high-precision requirements of the burner installation flange in the multi-nozzle structure gasifier, the above-mentioned assembly and welding methods and the conventional means and measures adopted are difficult to meet the requirements of flange assembly accuracy and welding quality
Method used
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Embodiment 1
[0046] The product selected in this example is a multi-nozzle opposed coal-water slurry gasifier, and its shell and burner installation flange specifications are as follows:
[0047] Gasifier: the inner diameter of the shell is φ3600mm, the wall thickness is 112mm, and the length is about 25000mm;
[0048] Burner mounting flange: inner diameter φ560mm, maximum thickness 154mm, flange height 683.8mm;
[0049] The outer diameter of flange and housing assembly is φ1020mm.
[0050] The assembly accuracy requirements of the burner mounting flange are as follows:
[0051] ① The four burner installation flanges are required to be evenly distributed at 90° on the same plane, and the plane deviation is not greater than 2mm;
[0052] ② The deviation of the coaxiality of each two relative burner installation flanges is not greater than 3mm;
[0053] ③ The deviation of the perpendicularity between the flange surface and its axis after welding is not greater than 1mm;
[0054] ④ The pe...
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Abstract
The invention discloses a multi-nozzle oppositely-arranged type gasifier nozzle mounting flange installing and welding method. The method includes the following steps: machining a nozzle mounting flange, selecting a gasifier assembly cylinder section where the nozzle mounting flange will be installed, installing an anti-deformation tool, machining a tube hole, where the nozzle mounting flange will be installed, in the assembly cylinder section, enabling the nozzle mounting flange to be matched with the assembly cylinder section, forming a fan-shaped groove with a big outside and a small inside between the nozzle mounting flange and the assembly cylinder section, enabling the inner bottom end of the fan-shaped groove to be in a semi-circular arc shape, enabling a location straight section to be arranged between the bottom and the inner wall of the assembly cylinder section, enabling the location straight section to have a 0.3-0.5mm fit clearance during assembling, adopting a 7-shaped connecting piece to connect and fix the nozzle mounting flange and the assembly cylinder section, detecting positional accuracy of four nozzles of the nozzle mounting flange, and welding the groove. By means of the mounting flange installing and welding method, the finally-obtained nozzle mounting flange is high in accuracy, good in quality and good in anti-deformation effect.
Description
technical field [0001] The invention relates to a method for installing and welding a flange, in particular to a method for installing and welding a flange for installing a burner of a gasification furnace with opposed multi-nozzles, and belongs to the technical field of welding. Background technique [0002] The accuracy requirements of the burner installation flange in the multi-nozzle opposed structure gasifier are very high. At present, the common welding groove forms, anti-deformation measures and means, and welding methods commonly used in the industry are difficult to ensure the above-mentioned flange assembly, and , it is difficult to meet the corresponding requirements of flange precision after welding. [0003] At present, in products with the same structure, the pipe holes corresponding to the above-mentioned flanges are usually marked by hand to determine the position and size of the holes, and the pipe holes are processed by gas cutting + grinding or machining. ...
Claims
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IPC IPC(8): B23K31/02
Inventor 赵英权昌佳张涛罗永飞
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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