Gasifier burner protection assembly and welding technology thereof

A welding process and gasification furnace technology, applied in welding equipment, welding accessories, granular/powdered fuel gasification, etc., can solve problems that affect the service life of alumina hollow ball bricks, poor thermal shock stability, cracking, peeling, etc. , to achieve the effect of preventing welding hot cracks and deformation, excellent corrosion resistance, and reducing welding hot cracks

Inactive Publication Date: 2019-08-16
NINGBO LIANTONG EQUIP MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, aggregates and matrix minerals need to be added to the alumina hollow sphere castable, but the composition of the aggregate and matrix mineral phases is corundum phase, and the thermal expansion rate is relatively large, resulting in extremely poor thermal shock stability of the product, which greatly affects the quality of alumina. The service life of hollow ball bricks, especially in environments with large temperature fluctuations, is prone to cracking and peeling

Method used

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  • Gasifier burner protection assembly and welding technology thereof

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Experimental program
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Effect test

Embodiment 1

[0048] It includes the following steps:

[0049] S1: Welding area cleaning; remove the burrs in each welding area, and then use acetone to clean the 20mm on both sides of the welding surface and the oil and impurities on the surface of the welding wire. There should be no free gas, oxide scale, and rust. Grease, dust, etc. During the welding process of nickel-based alloys, as the temperature rises, the weld becomes brittle due to air pollution, and nickel oxides are formed at the same time. In addition, harmful impurity elements such as S and P can form a low melting point with Ni. Crystals increase the hot cracking tendency of nickel-based alloys. Therefore, thoroughly removing oil and impurities in the welding area before welding can effectively prevent welding hot cracking.

[0050] S2: Butt the burner tube 10 and the protection ring 1, to ensure that the inner wall of the burner tube 10 and the protection ring 1 are on the same ring surface, and the gap between the blunt edges...

Embodiment 2

[0060] The welding process of the gasifier burner protection assembly disclosed in the second embodiment of the present invention is basically the same as that in the first embodiment. The difference is that when argon arc welding is used for bottom welding, the welding current is controlled at 150A. The voltage is controlled at 18V, and the welding speed is controlled at 14cm / min. When filling welding, the welding wire uses ERNiCr-3 welding wire with a diameter of φ0.8mm, the welding current is controlled at 120A, the arc voltage is controlled at 7V, and the welding speed is controlled at 7cm / min; During filling welding, the interlayer temperature is controlled between 58℃.

Embodiment 3

[0062] The welding process of the gasifier burner protection assembly disclosed in the third embodiment of the present invention is basically the same as that in the first embodiment. The difference is that when argon arc welding is used for bottom welding, the welding current is controlled at 150A and the arc The voltage is controlled at 18V, and the welding speed is controlled at 14cm / min. When filling welding, the welding wire uses ERNiCr-3 welding wire with a diameter of φ0.7mm, the welding current is controlled at 120A, the arc voltage is controlled at 13V, and the welding speed is controlled at 7cm / min; During filling welding, the interlayer temperature is controlled between 76℃.

[0063] The gasifier burners welded by the above three embodiments went through 100% visual inspection, 100% PT non-destructive testing, NDE non-destructive testing, air-tightness test, hydraulic test and helium leak test. No joint leakage was found The situation has reached the expected standard...

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Abstract

The invention relates to the technical field of gasifier burner protection, and discloses a gasifier burner protection assembly. The gasifier burner protection assembly comprises at least one protection ring sequentially welded to each other at the ring surface, and a protection cover welded to the ring surface of the protection ring at one side, the external diameter of every protection ring is same to the external diameter of a burner tube, the external diameter of one end, away from the end welded to the protection ring, of the protection cover is same to the external diameter of the outernozzle of a burner head, and the protection cover is made of a nickel-based alloy. The gasifier burner protection assembly is directly made of the nickel-based alloy, so the gasifier burner protectionassembly has good corrosion resistance and good high temperature oxidation resistance, and especially has excellent corrosion resistance, excellent thermal fatigue resistance and excellent high temperature impact resistance at a high temperatures, so the service life of the burner is prolonged; additionally, in the welding process, the welding current is controlled at 120-150 A, the arc voltage is controlled at 13-18 V, and the welding speed is controlled at 7-14 cm / min; and when welding is performed, the interlayer temperature is controlled at 58-76 DEG C, so welding hot cracks and deformation phenomena are prevented in a limited manner.

Description

Technical field [0001] The invention relates to the technical field of gasification furnace burner protection, in particular to a gasification furnace burner protection assembly and its welding process. Background technique [0002] The coal-water slurry pressurized gasifier is the key equipment of coal liquefaction technology. It uses coal as raw material, mixes with high-temperature steam and oxygen, and produces a series of chemical reactions to convert solid coal into gases containing CO, H2, CH4, etc. Used in synthetic ammonia, urea and other chemical raw materials and city gas. [0003] At present, the installation of the burner nozzle of the domestic gasifier mostly adopts the method of wrapping the burner head with refractory fiber felt. In the case of the burner chamber not being tightly closed during the gasification process, the synthesis gas entrains ash and slag infiltrate into the burner chamber. After the furnace is shut down, the molten slag is wrapped on the burne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/50C10J3/48B23K9/16B23K9/32
CPCB23K9/16B23K9/32C10J3/48C10J3/50
Inventor 周鹤群蔡丽萍单峥麟
Owner NINGBO LIANTONG EQUIP MFG
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