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

A waste incinerator, double-layer structure technology, applied in metal material coating process, coating, fusion spraying, etc., can solve problems such as tube explosion, thinning, high temperature chlorine corrosion and solid particle erosion of tube wall, etc. Achieve the effects of prolonging life, simple operation, and improving resistance to chlorine corrosion and solid particle erosion

Inactive Publication Date: 2018-06-29
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

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Embodiment 1

[0027] In this embodiment, a method for preparing an anti-chlorine corrosion double-layer structure alloy coating on the heating surface of a garbage incinerator comprises the following steps:

[0028] (1) Dry the powder material of the chlorine corrosion-resistant bottom layer and the powder material of the solid particle erosion-resistant surface layer at low temperature.

[0029] (2) Pre-treat the surface of the substrate on the heating surface of the waste incinerator, remove the surface oxide film and dirt, and then perform sandblasting on the substrate.

[0030] (3) The chlorine-resistant corrosion-resistant bottom layer in the double-layer structure coating was prepared by active combustion high-velocity gas spraying (HVAF). The spraying distance is 315mm, the thickness of the prepared chlorine corrosion-resistant bottom layer is 0.3mm, the porosity is ≤1%, and the bonding strength is ≥65MPa.

[0031] (4) The supersonic flame spraying process is used to prepare the sol...

Embodiment 2

[0034] In this embodiment, a method for preparing an anti-chlorine corrosion double-layer structure alloy coating on the heating surface of a garbage incinerator comprises the following steps:

[0035] (1) Dry the powder material of the chlorine corrosion-resistant bottom layer and the powder material of the solid particle erosion-resistant surface layer at low temperature.

[0036] (2) Pre-treat the surface of the substrate on the heating surface of the waste incinerator, remove the surface oxide film and dirt, and then perform sandblasting on the substrate.

[0037] (3) The chlorine-resistant corrosion-resistant bottom layer in the double-layer structure coating was prepared by the active combustion high-velocity gas spraying (HVAF) process. The spraying process parameters were: air pressure was 0.65MPa, propane pressure was 0.6MPa, and nitrogen flow rate was 60L / min. The spraying distance is 325mm, the thickness of the prepared chlorine corrosion-resistant bottom layer is 0...

Embodiment 3

[0041] In this embodiment, a method for preparing an anti-chlorine corrosion double-layer structure alloy coating on the heating surface of a garbage incinerator comprises the following steps:

[0042] (1) Low-temperature drying is carried out to the above-mentioned chlorine corrosion-resistant bottom layer powder material and solid particle erosion-resistant surface layer powder material.

[0043] (2) Pre-treat the surface of the substrate on the heating surface of the waste incinerator to remove the surface oxide film and dirt, and then perform sandblasting on the substrate.

[0044] (3) The chlorine corrosion-resistant bottom layer in the double-layer structure coating was prepared by the active combustion high-velocity gas spraying (HVAF) process. The spraying process parameters were: air pressure was 0.7MPa, propane pressure was 0.6MPa, and nitrogen flow rate was 65L / min. The spraying distance is 335mm, the thickness of the prepared chlorine corrosion-resistant bottom lay...

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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,...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/129C22C19/05C22C32/00
CPCC22C19/055C22C19/058C22C32/0052C23C4/06C23C4/129
Inventor 杨二娟李太江李巍李勇刘刚
Owner XIAN THERMAL POWER RES INST CO LTD
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