Wear-resistant repair coating and repair method for desulfurization slurry pump

A technology of desulfurization slurry and repair method, which is applied to coatings, devices for coating liquid on the surface, epoxy resin coatings, etc., can solve the problem that the wear resistance and bonding performance of coating repair materials cannot be combined at the same time. Achieve the effects of prolonging the continuous operation period, improving the bonding strength, and simplifying the repair process

Active Publication Date: 2021-05-25
上海邦聚工程材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a coating repair coating for a desulfurization slurry pump, which can solve the problem that the wear resistance and bonding performance of the coating repair materials in the prior art cannot be combined at the same time. For this reason, this The invention also provides a method for repairing the desulfurization slurry pump, which is suitable for the four parts of the pump: the impeller, the pump casing, the front fender, and the rear fender

Method used

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  • Wear-resistant repair coating and repair method for desulfurization slurry pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Impeller Repair of Desulfurization Slurry Pump

[0032] Pre-treatment of the impeller: For the area where the damaged blade 5 has a defect width greater than 20mm, the welded steel rod 6 is used as a boundary support column, and the welding method is spot welding. The welding points are at the contact points between the two ends of the steel rod 6 and the blade, and the diameter of the steel rod 6 is 3mm.

[0033]The welded rhombic expanded metal 7 fills the defect area of ​​the blade, and the welding method is spot welding, and the welding spots are on the same plane as the contact point between the periphery of the expanded metal 7 and the damaged blade 5 and the steel rod 6 . The diagonal distance of the diamond-shaped holes of the expanded metal mesh 7 is 40mm, and the thickness is 2mm.

[0034] The steel rods 6 and the rhombic expanded metal 7 are used to build a skeleton for repair coating materials to adhere to in the blade defect area.

[0035] Repair of the i...

Embodiment 2

[0044] Repair of Pump Shell of Desulfurization Slurry Pump

[0045] Step 1. Sandblasting the surface to be repaired. After sandblasting, the roughness of the surface to be repaired is 60-100 μm. The sandblasting material used is white corundum sand with a mesh number of 8 mesh. The compressed air used for sandblasting is degreasing and drying. After clean air, the pressure of compressed air is 7Bar.

[0046] Step 2. Clean the surface to be repaired with xylene. After cleaning, wipe it with a white cloth. Repeated cleaning until there is no visible stain on the white cloth. After cleaning, blow the surface to be repaired with dry air until the xylene is completely volatilized.

[0047] Step 3, take by weighing 1000g bisphenol A type epoxy resin, 200g aluminum oxide powder (average particle diameter is 5 μm), 50g silane coupling agent, obtain primer main agent after mixing; Take by weighing 50g polyamine (diethylene triamine), 80g curing accelerator (2-ethyl-4-methylimidazole),...

Embodiment 3

[0053] Repair of the front and rear guards of the desulfurization slurry pump

[0054] Step 1. Sandblasting the surface to be repaired. After sandblasting, the roughness of the surface to be repaired is 60-80 μm. The sandblasting material used is white corundum sand with a mesh number of 8 mesh. The compressed air used for sandblasting is degreasing and drying. After clean air, the pressure of compressed air is 7Bar.

[0055] Step 2. Clean the surface to be repaired with xylene. After cleaning, wipe it with a white cloth. Repeated cleaning until there is no visible stain on the white cloth. After cleaning, blow the surface to be repaired with dry air until the xylene is completely volatilized.

[0056] Step 3, take by weighing 500g bisphenol A type epoxy resin, 400g aluminum oxide powder (average particle diameter is 5 μm), after mixing uniformly, obtain base coat main agent; Take by weighing 150g polyamine (m-xylylenediamine), 20g Curing accelerator (2-ethyl-4-methylimidazol...

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Abstract

The invention discloses a wear-resistant repair coating for a desulfurization slurry pump. The wear-resistant repair coating includes four layers, which are a primer layer, a wear-resistant layer, a repair layer and a top coat in sequence from the inside to the outside. The thickness of the primer layer is 0.1-0.3 mm, the thickness of the wear-resistant layer is 1-20 mm, the thickness of the repair layer is 0.1-1 mm, and the thickness of the top coat is 0.1-0.3 mm. Compared with the prior art, the wear-resistant repair coating of the desulfurization slurry pump of the present invention has both excellent wear resistance and bonding performance, the coating is cured at room temperature, the repair process is simple, and the continuous operation period of the desulfurization slurry pump is prolonged; At the same time, the surface of the wear-resistant repair coating is smooth and clean, which reduces hydraulic resistance and is conducive to improving the efficiency of the desulfurization slurry pump.

Description

technical field [0001] The invention relates to the technical field of coating repair, in particular to a coating repair material and a repair method for a desulfurization slurry pump. Background technique [0002] The desulfurization slurry pump is an important part of the desulfurization system of thermal power generation, including lime slurry circulation pump, lime slurry discharge pump, stone replenishment pump and overflow pump, etc. The pumping medium is lime slurry, which is weakly acidic, and the temperature is between 45 and 80 Between ℃, the lime slurry contains 15-20% solid particles, the mesh of the solid particles is about 300 mesh, the main components are calcium sulfate and calcium carbonate particles, and also include a small amount of high hardness particles such as silica and alumina . Silica and alumina are the by-products of limestone grinding. They do not participate in the chemical reaction of absorbing acidic flue gas, but they will accumulate in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D7/61B05D3/12B05D5/00B05D7/00
CPCB05D3/12B05D5/005B05D7/586B05D2301/00B05D2320/00B05D2504/00C08K3/36C08K2003/2227C08K2201/014C08L2205/025C09D163/00C08L63/00C08K3/34B05D2420/01B05D2420/02B05D2420/03B05D2420/04
Inventor 邬苏焕丁芳
Owner 上海邦聚工程材料技术有限公司
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