Welding method for swirl vanes of cement burner

Abstract

The invention discloses a welding method for swirl vanes of a cement burner. According to the welding method for the swirl vanes of the cement burner provided by the invention, the convenience in machining is achieved, and the reliability is improved. The welding method for the swirl vanes of the cement burner comprises the following steps of S1, selecting an incoloy 800 material for an inner air pipe, and selecting cobalt 50 materials for the swirl vanes; S2, conducting pretreatment: polishing the to-be-welded surfaces of the swirl vanes and the inner air pipe through abrasive paper, and removing oxide impurities; S3, putting the swirl vanes and the inner air pipe into acetone, and carrying out ultrasonic cleaning; S4, plating a nickel layer on the to-be-welded surface of each pretreated swirl vane, and then thermally spraying Ni-based high-temperature brazing filler metal on the surface of each nickel layer; S5, clamping and fixing the treated swirl vanes and the inner air pipe through a clamp, and putting into a vacuum brazing furnace for brazing; S6, hammering the surface of a weld joint; and S7, conducting PT flaw detection, determining the crack condition, and conducting repair welding in time when cracks occur. According to the welding method for the swirl vanes of the cement burner provided by the invention, the high-temperature-resistant and oxidation-resistant performance of a burner nozzle is improved, meanwhile, precise control over the rotational flow angle of a burner is achieved, and the service life of the burner can be prolonged.

Description

technical field [0001] The invention relates to a cement burner, in particular to a welding method for a swirl blade of a cement burner. Background technique [0002] The cement rotary kiln burner is used to inject coal powder and combustion air into the rotary kiln, and can calcinate the cement raw meal to clinker. The flame temperature at the nozzle of the burner is above 1500°C, affected by fuel combustion, the temperature changes frequently and the temperature difference is large. Therefore, this part requires excellent high temperature resistance, thermal shock resistance, high temperature wear resistance, good chemical stability and alkali sulfur corrosion resistance. The most important thing in the burner is the swirling air, its main function is to make the pulverized coal and the combustion-supporting air mix quickly and fully, improve the combustion efficiency of the pulverized coal, stabilize the flame state and the thermal system in the rotary kiln, thereby impr...

AI Technical Summary

Problems solved by technology

The swirl vane is usually welded to the inner air duct by flame welding, but during the working process, the weld is prone to fatigue cracks, resulting in damage to the burner

The accuracy of welding is not easy to control, resulting in the deviation of the angle of the swirling wind, which affects the flow direction of the swirling wind

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