Method for repairing local thermal insulation layer lining of CFBB (circulating fluidized bed boiler) return feeder

Abstract

The invention discloses a method for repairing a local thermal insulating layer lining of a CFBB (circulating fluidized bed boiler) return feeder. The method comprises steps as follows: S1, determining a cavity of a thermal insulation layer: determining the damage condition of the thermal insulation layer and the range of the thermal insulation layer; S2, forming repairing holes: forming a plurality of repairing holes in corners of the periphery of the cavity of the thermal insulation layer; S3, connecting a press-in machine: selecting a grouting hole, welding a short metal tube at the grouting hole, and connecting the short metal tube to a pipeline of the press-in machine; S4, pressing in grout: putting a well stirred thermal insulation press-in material into a hopper of the press-in machine, starting the press-in machine, and pressing the thermal insulation press-in material into the cavity of the thermal insulation layer; shutting down the press-in machine when observing that the thermal insulation press-in material overflows observing holes; S5, cutting off the short metal tube 5-10 days after a furnace is started, and closing the repairing holes with iron plates. Repairing ofthe local thermal insulating layer insulation press-in material into the holes formed in the outer wall of the return feeder, the construction line of a furnace lining can be shortened, and the repairing cost of the furnace lining is reduced.

Description

technical field [0001] The invention relates to the field of thermal insulation and wear-resistant lining of a circulating fluidized bed feeder, in particular to a method for repairing the lining of a local heat insulation layer of a circulating fluidized bed boiler returner. Background technique [0002] The circulating fluidized bed boiler (CFBB) feeder is an important part. The operating temperature is about 900°C, the medium particle concentration is about 1600 kg / Nm³ (bulk volume), and the ash velocity is about 0.2 m / s. Usually adopt multi-layer thermal insulation and wear-resistant lining structure. The heat insulation layer adopts heat insulation castables, refractory fiber products or calcium silicate boards and other heat insulation materials with low thermal conductivity, and the wear-resistant layer adopts wear-resistant castables with high wear resistance. The thermal expansion coefficients of the wear-resistant layer and the heat-insulating layer are very diff...

AI Technical Summary

Problems solved by technology

[0003] The traditional method of repairing the refractory lining of the CFBB feeder cylinder has the following problems: 1. The diameter of the feeder cylinder is small, the working surface is small, and the operation is difficult; 2. The maintenance project is large and wasteful, and the undamaged The castable of the grinding layer is also removed and repaired at the same time; 3. The thickness of the wear-resistant layer is large and the body density is large, which is dangerous when dismantled; 4. At the same time, more lining joints of the wear-resistant layer are caused, and the integrity of the furnace lining is deteriorated; 5. After the lining is repaired, an oven is required before it can be used, which increases maintenance time and oven costs

[0004] The existence of the above problems makes the maintenance time of refractory lining of circulating fluidized bed boiler feeder longer, the cost is high, and the maintenance quality is not high

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