Welding repair material for repairing coking furnace and method for repairing coking furnace

Abstract

The invention provides a welding repair material for repairing a coking furnace and a method for repairing the coking furnace. The welding repair material comprises the following components in percentage by weight: 1-3% of metal aluminium powder, 5-8% of metallic silicon powder, 2-5% of mineralizing agent, 65-85% of silica fume or quartz powder and 10-20% of quartz sand. The method for repairing the coking furnace comprises the steps of spraying the welding repair material for repairing the coking furnace onto a wall brick surface of a high temperature furnace to be repaired along with an oxygen-enriched gas and carrying out an oxidation reaction, so that the welding repair material is partially molten and adhered on the wall brick surface of the coking furnace to be repaired, and a ceramic repairing layer is formed. The welding repair material for repairing the coking furnace has the advantages that secondary resources such as coal ash and silica fume are taken as raw materials, high-efficiency comprehensive utilization of the secondary resources is realized, and production cost of the welding repair material is reduced; besides, aluminium and silicon metals are added, so that spontaneous heating sintering is realized, and no high temperature high pressure gas is adopted when the welding repair material for repairing the coking furnace is adopted for repairing the coking furnace; content of silica in the welding repair material for repairing the coking furnace is more than 90%, so that the welding repair material for repairing the coking furnace is a highly silicious welding repair material and has a good silica brick breaking effect when being used for repairing the coking furnace.

Description

technical field [0001] The invention relates to the technical field of refractory materials, and more specifically relates to a ceramic welding material for repairing coke oven silica bricks and a method for repairing coke ovens using the welding material of the invention. Background technique [0002] The coke oven is a thermal kiln made of refractory bricks, and the wall of the coke oven will be damaged due to various reasons during use. In order to increase the service life of the coke oven, it needs to be repaired. [0003] Coke oven welding repair includes wet repairing and coke oven flame welding repairing. The former repairing furnace is easy to operate and has low maintenance cost, but the surface temperature of the furnace wall is lowered during repairing the furnace, and the one-time material loading time is short and the operating environment is harsh, so it has gradually been adopted. disuse. Coke oven flame welding repair is to use high-temperature flame to he...

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Problems solved by technology

[0003] Coke oven welding repair includes wet repairing and coke oven flame welding repairing. The former repairing furnace is easy to operate and has low maintenance cost, but the surface temperature of the furnace wall is lowered during repairing the furnace, and the one-time material loading time is short and the operating environment is harsh, so it has gradually been adopted. disuse

Coke oven flame welding repair is to use high-temperature flame to heat and melt the refractory powder for welding repair and furnace wall refractory bricks, and make the refractory powder physically adhere to the damaged furnace wall surface to repair the damaged wall surface, usually with Acetylene is used as fuel, and oxygen is used as a combustion-supporting gas, that is, high-temperature and high-pressure gas is required in the repair process. In addition, there are few reports on the components of welding repair materials.

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