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The construction of amorphous wear-resistant refractory materials for CFB boilers is stipulated in national standards.
Jan 08, 2019

In the last article, we briefly described the operation specifications of the CFB boiler furnace wall before the construction of the amorphous wear-resistant refractory material. In the following text, we mainly introduce the stirring and construction process of the amorphous wear-resistant refractory material. Specific job specifications.


1. Stirring of amorphous wear-resistant refractory materials should meet the following requirements:


1 Stir and record according to the technical documents of the material manufacturer. The material to be stirred should be uniform, and there should be no segregation and bleeding.


2 The mixing water should meet the requirements of the technical documents of the material manufacturer or the current industry standard “Concrete Water Standards” JGJ63 for prestressed concrete mixing water;


3 Each component should be accurately measured. The allowable deviation of the measurement of amorphous wear-resistant refractory materials should meet the requirements of Table 1:


4 The material to be stirred should be used up within the time specified in the technical documents of the material manufacturer, and the material that has been initially condensed should not be used;


5 On-site wear-resistant refractory mixing materials should be randomly sampled, the number of samples should not be less than 3 sets, one set is used for quality inspection of constructed materials, one set is used for oven inspection, one set is used for inspection; the inspection items and allowable deviations should be in accordance with the table. 2 regulations.


2. The casting or paving of amorphous wear-resistant refractory materials shall comply with the following requirements:


1 The curing time of the amorphous refractory insulation material corresponding to the corresponding part of the multi-layer lining shall comply with the technical documents of the material manufacturer;


2 When the amorphous wear-resistant refractory material is poured, the contact surface of the insulation body shall be protected against moisture; the contact surface of the steel bar, the wall-through material or the metal embedded parts and the construction material shall have expansion buffer material as required by the design technical documents;


3 The pouring or paving operation of the independent construction unit shall be continuous and shall be carried out simultaneously with the forming operation;


4 The casting height of the vibration casting furnace wall should not exceed 400mm; the casting height of the self-flow casting furnace wall should not exceed 2m, and the furnace wall with slope greater than 45° should not be cast by gravity;


5 The blank wear-resistant refractory plastic slab should be staggered and tight; the thickness of the bulk wear-resistant refractory plastic and ramming material should not exceed 100mm, and the paving should be uniform.


3. Self-flow casting, vibrating, beating, spraying and smearing of amorphous wear-resistant refractory materials shall comply with the following provisions:


1 Comply with the requirements of the technical documents of the material manufacturer or the current national standard "Code for Construction and Acceptance of Industrial Furnace Masonry Engineering" GB50211 and "Code for Quality Acceptance of Industrial Furnace Masonry Engineering" GB50309;


2 Before each batch of materials is first constructed, the consistency or plasticity of the mixture should be checked, and the amount of the mixture should be adjusted according to the technical documents of the material manufacturer;


3 The single-layer lining of the pressure-bearing parts shall be applied to the specified thickness at one time, and shall not be layered parallel to the fire surface;


4 each spraying area should not exceed 5m2;


5 Self-flowing castables shall not be mechanically vibrated;


6 When the construction accident is interrupted, the new and old joints shall take measures to prevent delamination, and the defect repair and surface treatment shall comply with the technical documents of the material manufacturer or the current national standard “Code for Construction and Acceptance of Industrial Furnace Masonry Engineering” GB50211. Provisions.


4. The maintenance of amorphous wear-resistant refractory materials should meet the requirements of the technical documents of the material manufacturer.


5. The unshaped wear-resistant refractory construction body should not be lifted and moved when the strength does not reach 70% of the design strength, and vibration and collision should be prevented during lifting and transportation.


6. The allowable deviation of the appearance of the amorphous wear-resistant refractory construction body shall comply with the requirements of Table 3.


Table 3 Appearance tolerance (mm) of unshaped wear-resistant refractory construction body


Appearance tolerance of unshaped wear-resistant refractory construction body


7. The expansion joint of the amorphous wear-resistant refractory construction body shall meet the following requirements:


1 The expansion joint setting should meet the requirements of the design technical documents. The expansion joints such as corners, doors, holes and holes should be avoided. The furnace wall at the expansion joint should be tight and not leaking;


2 The width deviation of the expansion joint should be 0mm~+2mm, and the edge should be flat and straight;


3 The expansion joint should be cleaned, and no debris should be trapped; the flexible refractory material should be filled in the joint according to the design requirements, and the flexible refractory material should be flush with the surface of the fire surface.


8. The on-site construction environment temperature should be 5 °C ~ 35 °C, and should not be carried out in the rain or direct sunlight. When constructing under special climatic conditions, it shall comply with the relevant provisions of the current national standard "Code for Construction of Mass Concrete" GB50496.


Construction is the top priority for the safe operation of boilers. In the whole set of construction operations, construction must be carried out in strict accordance with the operating standards stipulated in the national standards, and the construction quality should not be affected, resulting in unnecessary losses.


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