The Impact of Furnace Atmosphere on Product Quality

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2026-04-16 09:52

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1.2 The Impact of Furnace Atmosphere on Product Quality

Enamel glaze undergoes an oxidation reaction during melting and sintering at high temperatures. The ground coat enamel and steel plate also undergo oxidation at high temperatures, improving adhesion. In a reducing atmosphere, components in the cover coat enamel will result in poor surface gloss and an unnatural color.

The main reason for a reducing atmosphere in the furnace is the CO produced after fuel combustion. Ash, water vapor, SO2, etc., produced during fuel combustion also enter the furnace, significantly impacting product quality.

Fuel selection is a crucial factor affecting the furnace atmosphere. Coal is the most polluting, followed by residual oil, tar, heavy oil, and crude oil, while coal gas, natural gas, and liquefied petroleum gas create a good atmosphere in the furnace. Electric furnaces completely avoid the reducing atmosphere problem.

Other factors contributing to a reducing atmosphere in enamel furnaces include the furnace structure and its operation and management. A good coal-fired furnace, when operated properly, can also have a well-controlled atmosphere. Even a good furnace can be damaged if it is not operated properly. Incomplete combustion of fuel, improper adjustment of the flue tension, and poor airtightness of flues built with refractory materials can all lead to problems. Some furnaces may experience flue blockage or gas leakage due to improper design when they are new. In other cases, the flue cracks may widen in the later stages of the furnace, causing a large amount of gas to be drawn into the furnace and preventing the gas from being discharged from the chimney in time. All of these can trigger reduction reactions and affect product quality.

(To be continued)

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