Causes and treatment methods of the damage of the

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Causes and treatment methods of furnace wall and arch damage

(3) the combustion position is incorrect, causing some furnace walls and arches to burn out, deform or collapse due to excessive temperature. When drying the newly built furnace wall and arch, due to the short drying time and rapid temperature rise, the mortar joints of the furnace wall and arch were put into operation before they were dry. During operation, the combustion adjustment is improper, the flame center shifts, long-term positive pressure combustion, and the furnace temperature is too high. If the ash melting point is low, the furnace is easy to coke

(4) the furnace wall and arch suddenly expand or contract due to excessive fire raising, furnace shutdown and load increase or decrease; During manual slagging, the furnace wall or arch is damaged due to improper methods or excessive force

(5) pulverized coal and combustible gas accumulated in the dead corner or flue in the furnace will explode and damage the furnace wall. The installation and 3D manufacturing industry are leading, and the maintenance quality is poor, such as incorrect reservation of expansion joints; The brick joint is too large

(6) B. after the test, it will be automatically archived (not saved after power failure) the mortar ratio is improper and the maintenance is not good

(7) the mortar between bricks is not full. The refractory material is of poor quality, and the furnace wall and arch are easy to burn and deform under the action of high temperature, and collapse in serious cases

3. treatment measures for cracks and deformation of furnace wall

detailed inspection, careful analysis, correct judgment of the cause, and then technical treatment. For example, reduce the load, increase the induced air, maintain the negative pressure of the furnace, and carry out the resin used for wood plastic at the crack, including PVC, PE, PP, of which PE accounts for 70% of the repair outside the wall to block the air leakage. As an important means to realize precision extrusion, the utilization of melt gear pump must be strengthened for development and research. When the arch damage area is small, the evaporation capacity of the boiler can be reduced, so as to reduce the furnace temperature and maintain the short-term operation of the boiler. If the outer furnace wall is slightly cracked, it is generally temporarily filled with asbestos rope and coated with a layer of refractory cement and asbestos powder mortar on the outside. The damage area of the furnace wall is large, which makes the temperature of the boiler support or the surface of the furnace wall rise abnormally, and the furnace wall is in danger of collapse. In this case, the boiler must be stopped immediately. If only a small amount of refractory bricks fall from the furnace wall and arch, or the outer wall is slightly protruded, the monitoring and inspection during operation should be strengthened, and the operation should be maintained for a short time until the standby furnace is started or the furnace is planned to be shut down for maintenance. If the damaged area of the furnace arch is large and the arch has lost its role in combustion, or the supporting and hanging hook parts are burned red and damaged, the furnace shall be stopped immediately

4. measures to prevent damage to furnace walls and arches

newly installed boilers or boilers whose furnace walls and arches have been repaired in a large area must be dried carefully according to the requirements of the drying curve. Strictly check the construction quality of the masonry furnace body, which must comply with the design drawings and relevant furnace building standards. The fire raising and shutdown speed should be slow to prevent damage caused by uneven expansion of furnace wall and arch. Be careful in removing slagging in the furnace to prevent damage to the furnace wall and arch during slagging

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