Chloridization corrosion resistant double-layer structure alloy coating for heating surface of garbage incinerator and preparation method

Abstract

The invention discloses a chloridization corrosion resistant double-layer structure alloy coating for a heating surface of a garbage incinerator. The double-layer structure comprises a chloridizationcorrosion resistant bottom layer and a solid particle erosion resistant surface layer, wherein the chloridization corrosion resistant bottom layer comprises components in percentage by mass as follows: 20%-23% of Cr, 8%-10% of Mo, 3.15%-4.15% of Nb, 5% of Fe, 1% of Co, 0.5% of Mn, 0.5% of Si, 0.4% of Al, 0.4% of Ti and the balance of Ni and inevitable impurities; the solid particle erosion resistant surface layer comprises components in percentage by mass as follows: 80% of NiCr and 20% of Cr3C2; the chloridization corrosion resistant bottom layer in the double-layer structure coating is prepared with an activated combustion HVAF (high velocity air fuel) spraying process; the solid particle erosion resistant surface layer in the double-layer structure coating is prepared with an HVOF (highvelocity oxygen fuel) spraying process. The problems of pipe wall thinning and pipe explosion caused by the fact that the heating surface of the garbage incinerator is easily corroded by high-temperature chloride and eroded by solid particles are solved, and the service life and the maintenance cycle of pipes on the heating surface of the garbage incinerator are prolonged greatly.

Description

technical field [0001] The invention relates to a double-layer structure alloy coating and a preparation method thereof, in particular to a chlorine-resistant double-layer structure alloy coating on a heating surface of a garbage incinerator and a preparation method thereof. Background technique [0002] Waste-to-Energy (WTE) waste incineration technology is a harmless and highly-reduced waste treatment method, which can also realize the resource utilization of waste and provide green power for cities . In recent years, major cities in China have built waste incineration plants to solve the problem of garbage siege. [0003] The concentration of chlorine in solid waste is usually high, ranging from 0.5% to 2.0%, while the concentration of sulfur is 0.1% to 0.4%. Chlorination corrosion in waste incineration is the main factor causing the corrosion of boiler heat exchange parts. There are a large amount of chlorine corrosive elements in the flue gas of the waste incinerator,...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a double-layer structure coating and its supersonic flame preparation method to solve the problem of chlorine corrosion and solid particle erosion on the heating surface of the garbage incinerator. The coating prepared by the method of the present invention can be used on the heating surface of the garbage incinerator A protective coating is formed on the surface, which can achieve the effect of preventing high-temperature chlorine corrosion and solid particle erosion, and solves the problem of tube wall thinning and tube explosion caused by high-temperature chlorine corrosion and solid particle erosion on the heating surface of the waste incinerator, which is extremely effective. Greatly prolong the service life and maintenance cycle of the heating surface pipeline of the garbage incinerator

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