New process for scrubbing wear repair of desulfurization pump

Desulfurization pumps occupy an important position in industrial production. In the past, desulfurization pumps in the wet desulfurization process often have major problems such as erosion and corrosion.

For such problems, companies often use replacement spare parts to meet production process requirements. Manufacturers are also replacing the material of the desulfurization pump to extend its service life. This has inevitably increased the cost of investment regardless of the manufacturer or the unit. New materials with low cost, wear resistance and corrosion resistance have been in the process of development and experimentation.

The desulfurization slurry circulation pump is a large-scale equipment after the desulfurization system relay heat exchanger and the booster fan. It is usually centrifugal, and it directly withdraws the slurry from the bottom of the tower for circulation. It is the pump with the highest flow rate and the most demanding conditions in the desulfurization process. Corrosion and abrasion often cause it to fail. Its main features are:

(1) Strong corrosive

(2) Strong abrasion

(3) Cavitation

Desulfurization pump flushing wear repair standards and specifications:

First, the construction conditions

1. The surface temperature of the substrate during construction must be greater than the dew point temperature of 3 ° C, the relative humidity must be less than 60%, to avoid the appearance of water film on the metal surface;

2. It is recommended to carry out the construction at an ambient temperature of 15 ° C ~ 32 ° C. When the summer temperature is high, the curing time of the Sole material will accelerate; when the temperature is low in winter, the curing time of the material will be significantly slowed down, so please properly handle the operating ambient temperature.

2. Dispose of the parts of the desulfurization pump that have serious wear or defects.

1. According to the new equipment or drawings, determine the dimensions of the equipment that should be achieved after the repair; 2. Select the steel plate/reinforced steel that is homogenous or close to the equipment substrate, and weld the skeleton to the defect.

Third, the surface treatment of the repair part of the desulfurization pump

Proper surface treatment is the key to the successful application of Sorel wear-resistant repair products. The purpose of surface treatment:

1. Make the surface of the equipment to be repaired to a certain roughness, increase the adhesion of the silicon carbide wear-resistant coating material and the substrate; 2. Remove the rust layer, dust, dirt, oil, grease and moisture on the surface of the equipment to ensure The adhesion of the coating.

2. (a) sandblasting

1. Sandblasted compressed air must be degreased, dry, and free of impurities. A water separator must be installed.

2. For areas where no coating is required, these areas must be properly protected with occluders prior to sand blasting;

3. Sand blasting should be made of high quality brown fused alumina. After blasting, the surface of the equipment should reach 50μm~100μm roughness, ie Sa3 level.

(2) Surface cleaning

1. Remove surface grease and debris with acetone or degreasing cleaner;

2. After cleaning, purify with acetone to purify the acetone or cleaning agent.

Fourth, Sole material SD3000 construction

1. Strictly mix according to the ratio of SD3000, mix well after mixing, the specific blending ratio and curing time refer to the product data sheet;

2. Use a brush to apply a thin layer of SD3000 primer to the surface to be applied. After the coating is completed, carry out the subsequent SD7400 coating construction within 1 hour.

Five, Solei material SD7400 material construction

1. Mix in strict accordance with the ratio of SD7400, until fully mixed. The specific blending ratio and curing time are referred to the product data sheet;

2. The mixing time takes more than 3 minutes, and the white curing agent is completely mixed into the dark gray small particles;

3. After mixing well, the material must be used up within 20 minutes, otherwise the material will become hard, which is not conducive to construction;

4. Using a plastic scraper, apply the mixed SD7400 to the surface of the ceramic primer and press it tightly (such as tamping with a rubber hammer);

5. Scratch the surface of the coating with a squeegee before the coating is initially solidified;

6. In a small space, the mixed small particles of silicon carbide can be directly pressed on the surface of the equipment to be constructed by wearing half finger rubber gloves;

7. When the temperature is low, the main agent of SD7400 can be preheated to 35 °C to reduce the viscosity and facilitate mixing and mixing.

Sixth, desulfurization pump flushing wear repair polishing dressing

1. After the SD7400 material is completely cured, the angle of the coating surface is not flat, and the burr is removed by using an angle grinder and a grinding wheel.

2. The space is narrow and it is not convenient to use the angle grinder. The electric grinder can be used for dressing.

Stainless Steel Wire Production Line

Stainless steel wire drawing machine line