Joint filling material for silicon carbide wall-mounted bricks

Abstract

The invention belongs to the technology of refractory materials for garbage incinerators, and relates to a joint filling material for silicon carbide wall-mounted bricks. The joint filling material for the silicon carbide wall-mounted brick is filled into a gap between a water-cooled tube of a garbage incinerator and the silicon carbide wall-mounted brick in a self-flowing manner; the joint sealing material comprises the following raw materials in percentage by mass: 60-90% of silicon carbide, 0-25% of corundum, 0-3% of active alpha-Al2O3 micro powder, 6.5-10% of silicon dioxide micro powder,3-10% of aluminate cement, and 0.1-0.2% of a water reducing agent. The water reducing agent is externally added. The material has good fluidity, and can realize filling of fine gaps; the heat conductivity coefficient is high and reaches 8W / mK or above at 1000 DEG C; and acid and alkaline gas corrosion resistance at high temperature is good, the volume stability is good, and the service life of thewater-cooled coil is effectively prolonged.

Description

technical field [0001] The invention belongs to the technology of refractory materials for garbage incinerators, and relates to a joint filling material for silicon carbide wall-hanging bricks. Background technique [0002] With the rapid development of my country's economy, the amount of urban garbage and industrial waste has increased sharply. Improper disposal of these garbage will seriously affect the environment and endanger people's survival; Chemical treatment; after the garbage is burned in the incinerator, a large amount of high-temperature gas is generated. The high-temperature gas realizes the heat recovery and reuse through the heat exchange of the water-cooled pipe, and saves energy; however, the high-temperature gas generated by garbage incineration contains a large amount of corrosive components. , such as chloride ions, fluoride ions and other acid radical ions and alkali metal compound vapors such as sodium salts and potassium salts, a large number of corrosiv...

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Problems solved by technology

[0002] With the rapid development of my country's economy, the amount of urban garbage and industrial waste has increased sharply. Improper disposal of these garbage will seriously affect the environment and endanger people's survival; Chemical treatment; after the garbage is burned in the incinerator, a large amount of high-temperature gas is generated. The high-temperature gas realizes the heat recovery and reuse through the heat exchange of the water-cooled pipe, and saves energy; however, the high-temperature gas generated by garbage incineration contains a large amount of corrosive components. , such as chloride ions, fluoride ions and other acid radical ions and alkali metal compound vapors such as sodium salts and potassium salts, a large number of corrosive components are prone to chemical reactions with metal water-cooled pipes at high temperatures, resulting in corrosion damage to water-cooled pipes and affecting production efficiency

[0003] At present, the waste incinerator industry mostly uses refractory materials with a certain thickness to protect the water-cooled pipes; the most advanced furnace type currently uses silicon carbide wall-mounted bricks to build on the surface of the water-cooled coil, taking advantage of the high thermal conductivity of silicon carbide bricks Improve the heat exchange efficiency, but the silicon carbide brick and the water-cooled pipe cannot be tightly bonded, there is a gap of ≤10mm between the two, and the local gap is ≤2mm; therefore, a sealing material needs to be filled in the gap to seal the corrosive Gas penetration, the existing wall-hung brick furnace structure often uses silicon carbide refractory mud to smear between the hanging bricks and the water-cooled pipe. Due to the high viscosity of the mud, it is easy to have insufficient mud filling and a large number of defects during the construction process. It directly affects the airtightness and thermal conductivity; the gap between the hanging bricks and the water-cooling pipe is narrow, especially at the top of the combustion chamber. The pouring construction of the joint filler can only be carried out, and the width of the furnace top masonry is more than 3m. When the existing refractory self-flowing material products flow in the narrow gaps with long distances and small inclination angles, it is very easy for the material to lose water and segregate to cause blockage, which cannot be effectively filling

[0004] Therefore, it is necessary to develop a joint filling material with high fluidity, high thermal conductivity, high volume stability and corrosion resistance to hot flue gas for wall-mounted bricks of waste incinerators, which can improve the filling effect and ensure heat exchange efficiency while simplifying the construction method ; The self-flowing castable involved in the patent "self-flowing castable for filling the back seam of the side wall of the aluminum electrolytic cell" CN101723690B is mainly used in the gap of 5-40mm between the shell of the aluminum electrolytic cell and the silicon carbide brick. The use environment and filling difficulty are much smaller than the gap between the wall-mounted bricks of waste incinerators and water-cooled pipes, and cannot be directly applied to the field of silicon carbide wall-mounted bricks for waste incinerators

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