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Anti-corrosion and wear-resistant treatment method for Lurgi gasifier

A Luqi gasifier, anti-corrosion and wear-resistant technology, applied in anti-corrosion coatings, manufacturing combustible gases, coatings, etc., can solve problems such as huge manufacturing and maintenance costs, huge system impact, and overall thinning, saving maintenance time. , the effect of reducing the cooling rate and increasing the density

Active Publication Date: 2020-09-08
SHANXI LUAN COAL BASED SYNTHETIC OIL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to save costs, the test of blending semi-coke and other coals on the gasifier can achieve certain results, but at the same time, the damage to the equipment is gradually reflected. The corrosive gas contained in the gas leaks, and the thick steel plate inside the neutral cylinder Part of the welding joints of the upper cone and the upper cone were corroded and the overall thinning was serious, resulting in the shutdown of two or even three gasifiers at the same time, which had a huge impact on the system
The normal operation of the system can be ensured by partially surfacing stainless steel on the corrosion area, but the effect is extremely poor, and huge manufacturing and maintenance costs are required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The anti-corrosion and wear-resistant treatment method of Lurgi gasifier includes the following steps: (1) Polish the corroded surface inside the neutral cylinder of Lurgi gasifier with sandpaper to remove the corroded layer; then preheat the corroded surface to 50°C Welding 1Cr13 tortoise shell netting G-03 preheated to 50°C, electrode diameter is 3.2mm, welding current is 140A, welding voltage is 23V, welding points are 32; (2) preheating tortoise shell netting, treatment temperature 380°C, then thermal spray anti-corrosion and wear-resistant materials. The composition of anti-corrosion and wear-resistant materials is: 35kg of tungsten carbide powder, 27kg of nano-zirconia, 10kg of nano-titanium dioxide, 5kg of zinc, and 10kg of activated alumina.

Embodiment 2

[0022] The anti-corrosion and wear-resistant treatment method for Lurgi gasifier includes the following steps: (1) Grinding the corroded surface of the inner wall of the upper cone section of the Lurgi gasifier neutral tube with sandpaper to remove the corroded layer; then preheating the corroded surface to After 70°C, the welding is preheated to 90°C for welding 1Cr13 tortoise shell net G-03, the diameter of the electrode is 3.2mm, the welding current is 220A, the welding voltage is 27V, and the number of welding points is 40; (2) Preheat the tortoise shell net Treatment, the treatment temperature is 450 ° C, and then thermal spray anti-corrosion and wear-resistant materials. The composition of anti-corrosion and wear-resistant materials is: 50kg of tungsten carbide powder, 46kg of nano-zirconia, 15kg of nano-titanium dioxide, 10kg of zinc, and 15kg of activated alumina.

Embodiment 3

[0024] The anti-corrosion and wear-resistant treatment method of Lurgi gasifier includes the following steps: (1) Sand the corroded surface inside the neutral tube of Lurgi gasifier and the inner wall of the upper cone section with sandpaper to remove the corroded layer; After heating to 100°C, weld the high-temperature-resistant tortoise shell netting G-05 that is preheated to 70°C. The diameter of the electrode is 3.2mm, the welding current is 150A, the welding voltage is 23V, and the number of welding points is 35; (2) the tortoise shell netting Carry out preheating treatment, the treatment temperature is 390°C, and then thermal spray anti-corrosion and wear-resistant materials. The composition of anti-corrosion and wear-resistant materials is: 40kg of tungsten carbide powder, 37kg of nano-zirconia, 12kg of nano-titanium dioxide, 8kg of zinc, and 12kg of activated alumina.

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Abstract

The invention discloses an anticorrosive and antiwear treatment method for a Lurgi gasifier, belongs to the technical field of coal gasification equipment, and provides the anticorrosive and antiweartreatment method for the Lurgi gasifier to solve a technical problem. The technical scheme adopted to solve the technical problem is that the anticorrosive and antiwear treatment method for the Lurgigasifier comprises the following steps: (1) performing sanding on the corroded surface of the interior of a neutral cylinder and / or the inner wall of an upper conical segment of the Lurgi gasifier byusing abrasive paper to remove a corrosive layer, and welding a hexsteel; and (2) performing preheating treatment on the hexsteel, and then performing thermal spraying with an anticorrosive and antiwear material; and the anticorrosive and antiwear material is composed of the following components in parts by weight: 35-50 parts of tungsten carbide powder, 27-46 parts of nano zirconium oxide, 10-15parts of nano titanium dioxide, 5-10 parts of zinc, and 10-15 parts of activated aluminium oxide. The anticorrosive and antiwear method provided by the invention has good anticorrosive and antiwear effects, can effectively reduce maintenance charges, and can be widely applied to the field of synthesis gas preparation.

Description

technical field [0001] The invention relates to a Lurgi gasifier, in particular to an anticorrosion and wear-resistant treatment method for a Lurgi gasifier, and belongs to the field of coal gasification equipment. Background technique [0002] At present, the Lurgi gasification technology is widely used in domestic coal gasification plants, and the Lurgi gasifier is the core equipment of this technology. [0003] In order to save costs, the test of blending semi-coke and other coals on the gasifier can achieve certain results, but at the same time, the damage to the equipment is gradually reflected. The corrosive gas contained in the gas leaks, and the thick steel plate inside the neutral cylinder Part of the welding joints in the upper cone section corroded and the overall thinning was serious, resulting in the shutdown of two or even three gasifiers at the same time, which had a huge impact on the system. The normal operation of the system can be guaranteed by partially ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/72C09D1/00C09D5/10C09D7/61
Inventor 胡贤贤赵海峰李耀东付瑾鲁军鹏梁亚军王鑫鑫
Owner SHANXI LUAN COAL BASED SYNTHETIC OIL
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