Malaysia customer order 30 tons refractory brick and castable.
Self-flowing castable is a castable refractory material that can flow and degas without vibration. Its characteristic is that it can be poured into various shapes of construction bodies without vibration by adding appropriate water without reducing or significantly reducing the performance of the castables. Self-flowing castables are especially suitable for thin-walled or complex-shaped parts that cannot be vibrated for molding. During the maintenance process of CFB boilers, the maintenance process points and quality requirements of self-flow castables are as follows.
01Inspection
Process points: 1. Check and record the erosion and wear of the self-fluid material as well as defects such as cracks and shedding. 2. Check the compactness of the refractory and wear-resistant layer
Quality requirements: 1. The depth and width, surface peeling thickness, peeling area size, etc. cannot exceed the values specified in the specification. 2. There should be no defects such as looseness and holes.
02Removal of self-flowing castables
Key points of the process: 1. Mark the area to be removed with a color pen; 2. Remove the non-heated surface area with electric hammers, hammers and other tools;
Quality requirements: 1. Label clearly and correctly; 2. Clean; joint surface is straight;
03 Stir
Key points of the process: 1. The water quality should be qualified; 2. The water temperature and ambient temperature meet the requirements, otherwise measures must be taken; 3. After the packaging bag is opened, it should be used immediately. 4. Dry stir. 5. Add water and stir according to the manufacturer’s requirements. 6. Record each stirring.
Quality requirements: 1. Water quality and water temperature meet the requirements; 2. The mixing time should comply with the time specified by the manufacturer, and the time from adding water and stirring to completion of pouring should not exceed the value specified by the manufacturer. 3. Keep complete stirring records. 4. Every time the material is mixed, the mixer should be cleaned;
04 Template production and installation
Key points of the process: 1. Carry out lofting, blanking and production of wooden molds according to the design and the actual situation on site. 2. Before setting up the mold, check whether the welding position, number and shape of all grab nails are correct, and check whether the plastic caps of all grab nails are complete. For grab nails without plastic caps, the tops of the grab nails should be painted with asphalt paint. 3. Before setting up the formwork, the formwork to be set up and the debris in the upper area should be cleaned up. 4. After the formwork is set up, it should be poured immediately.
Quality requirements: 1. The production size is correct and meets the design requirements; 2. The mold is installed firmly and the seams are tight.
05Pouring of self-flowing castables
Process points: Before pouring, the template size should be carefully checked. 2. The mixed materials should be poured into the template immediately.
Quality requirements: 1. The pouring size meets the design; 2. The pouring time meets the manufacturer’s requirements.
06Self-flow material mold removal inspection
Key points of the process: 1. Remove the mold to check the pouring quality. 2. Carry out maintenance.
Quality requirements: 1. The interval from the completion of pouring to the removal of the mold must not be less than the time specified by the manufacturer. 2. After the formwork is removed, the surface should be free of defects such as cracks, dents, honeycombs, holes, etc. 3. Maintenance complies with manufacturer’s requirements.