Kiln mouth guards should deal with the problem how to solve?

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Kiln mouth guard is castable and kiln shell middleware, it suspended in the high temperature inside the kiln hood, its exposed surface directly affected by the high temperature. Kilns shield divided into multiple blocks along the kiln fan, left a large gap between adjacent blocks. Sandwiched clinker kiln dust or particles in the secondary air (also known as secondary air, which comes from the clinker cooler gas) flows through these gaps kiln. Kiln mouth guard failure modes are the following: 1, burning; 2, corrosion; 3, fracture. Kilns shield failure, will result in damage to the cylinder kilns, but also affect kilns or refractory castable refractory life. Guards kilns Failure Analysis: 1, the continuing role of the high-temperature kilns shield failure. Kilns guard's role is to keep the cylinder is not burning kilns, from corrosion, deformation does not occur. Kiln mouth guard mouth guard bare the "load" large, large amount of thermal expansion, when this "load" over its own "endurance limit", to the mouth guard will be burning. After burning kilns guard, made a rough surface residue, and there will be many micro-cracks (the naked eye can be observed), severe flaking off the block, resulting in failure. 2, the material strength is not enough cause kilns shield failure. Multi kilns guard made of cast iron cast iron and heat-resistant. Even resistant cast iron, it is only withstand temperatures of about 750 ℃, while retaining plate out of the kiln temperature is generally above 1000 ℃, therefore, under high temperature kilns guard significantly lower strength of the material, and easily oxidized resulting kilns shield failure. 3, the structural design of improper installation, retaining plate "sick to work", leading to failure. Kiln mouth guard into the overall structure and split structure of the two forms. As demolition guard split kilns are more trouble, and thus extremely difficult to repair and maintenance, so that this structure kilns guard long-term "sick of work" and not repair, squeeze each other, resulting in deformation, resulting in the fracture lapse. 4, the high temperature gas in the alkali and sulfur content, the kiln mouth guard is corrosion, with high temperature erosion and dust particles, such kilns guard corrosion failure. Especially when cooler "Snowman" and touch guard when more serious. The comprehensive work sometimes for several reasons, so that the cylinder becomes flare kilns, kiln mouth guard crack occurs swelling, fall. Kilns shield failure treatment kiln mouth guard after the failure, to be replaced immediately in order to protect the cylinder is not burning kilns, no corrosion, no deformation. Please indicate Henan YuFeng Heavy Machinery