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Standard for inspection of refractory castable in boilers

Words:[Big][Medium][Small] Mobile Page Two-Dimensional Code 2018-06-10     

A.Inspection scope of castable:

1. Fire-resistant and wear-resistant surface of water wall around dense phase zone of lower furnace can be made of plastic

2. Corundum corundum can be used as anti-abrasion beam for water-cooled wall around the furnace

3. Corundum plastic at the bottom of the furnace hanging screen and through the wall

4. Corundum plastic for horizontal flue at furnace outlet

5. Insulation castable at separator inlet

6. Corundum plastic on inner surface of cyclone separator

7. Corundum plastic on inner surface of feed legs and feed back legs

8. Corundum corundum plastic for outlet of separator

9. Fire-resistant and wear-resistant plastic between cloth wind board and wind cap

10. Refractory and wear-resistant plastics in water and air cooling room

11. Start the firebrick inside the burner

12. Fire-resistant and wear-resistant plastics are available at manhole doors of boiler furnace and rear flue

(note: refractory and wear-resistant plastics, corundum plastics, insulation and insulation castable are collectively referred to as castable)

Ii. Castable inspection items:

1. Whether there are network cracks and penetrating cracks on the surface of castable. 

2. Whether the castable will affect the normal use of the thermal measuring point. 

3. Wear and loss of castable. 

4. Whether the periphery of pouring material is smooth.

Iii. Inspection standards for castable:

1. The chamber of a stove or furnace dense-phase zone around the wall and hanging at the bottom of the screen and wall castable surface should be smooth and complete uniform thickness, no wear, fall off, pits and bulge phenomenon, covering tube no nudity, no mesh cracks and perfoliate crack, appeared crack width should be less than 5 mm, greater than 5 mm must be demolished for local repair. 

2. The surface of the cyclone separator, the feed leg and the pouring material inside the feed back leg shall be complete and smooth, with uniform thickness, no wear, fall off, pockmarked surface and bulge phenomenon, and no network crack and penetrating crack. In case of layered bulge or crack, the width shall be less than 10mm, and local demolition and repair shall be carried out when the width is greater than 10mm.

3. The surface of the horizontal flue at the outlet of the furnace and the cyclone separator shall be complete and smooth, with uniform thickness, no wear, fall off, pockleness and drum phenomenon, no network crack and penetrating crack, such as the occurrence of layered drum or crack width should be less than 10mm, greater than 10mm must be partially removed and repaired.

4. For the coating of casting material that often falls off, manual vibration should be adopted to detect hidden defects. When the casting material falls off and becomes loose, local demolition and repair must be carried out.

5. Anti-wear beam casting material surface should be complete and smooth, uniform thickness, no falling off, bulge phenomenon, nail firmly, no open welding phenomenon, no mesh crack and penetrating crack, crack width should be less than 5mm, greater than 5mm must be local demolition repair. 

6. The castable at the measuring point of the boiler shall not impede the advance and back of the measuring point and change the elevation and Angle of the measuring point. 

7. The surface of castable in the water cooling air chamber should be complete and smooth, with uniform thickness, no wear, fall off, pitted surface and bulge phenomenon, no exposed pipe row of covering layer, no network crack and penetrating crack, such as the occurrence of layered bulge or crack width should be less than 10mm, greater than 10mm must be carried out

Part of the demolition and repair.

8. The firebrick in the starting burner should be firm and smooth, without wear, fall off and bulge.

9. The pouring material between the cloth wind plate and the wind cap should be complete, uniform thickness, no wear, fall off and bulge phenomenon, no network crack and penetration crack, cover the cloth wind plate tube row without exposure, crack width should be less than 5mm, greater than 5mm must be partially removed and repaired.

10. Castable material at manhole door of boiler furnace and tail flue is firm and smooth, without wear, fall off and bulge.



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