[Zhongbo.com] The gas or flame in the glass kiln is divided into three types: oxidizing atmosphere, neutral atmosphere and reducing atmosphere according to its chemical composition and oxidation or reduction ability. Theoretically, when the air excess coefficient α>1 in the kiln, there is excess oxygen in the combustion products. At this time, it is an oxidizing atmosphere or an oxidizing flame; when α=1, there is no excess oxygen and unburned CO in the combustion product, and this is a neutral atmosphere or a neutral flame; when α<1, in the combustion products Contains a certain amount of CO, which is a reducing atmosphere or a reducing flame. Controlling the furnace atmosphere is to control the nature of the atmosphere in the kiln.
Judging the nature of the atmosphere in the kiln can be estimated by the brightness of the flame in addition to the gas analysis method. The flame is bright and the flame is oxidized; the flame is not bright, and the flame is slightly neutral; the flame is the reducing flame. The kiln atmosphere is usually regulated by controlling the air excess factor.
The flame in the kiln changes during the nature of the atmosphere on the stroke, as is the case under complete combustion conditions. For example, the flame at the spout is always slightly reductive, and gradually becomes neutral until oxidizing as the combustion process progresses. The formulation of the atmosphere system is mainly related to the composition of the ingredients, the type of clarifying agent, and the color of the produced glass. For example, Glauber's salt is used as a clarifying agent for flat glass. In order to ensure the high temperature decomposition of thenardite, it is necessary to add pulverized coal as a reducing agent. Then the atmosphere system used is: 1#, 2# small furnace needs to reduce the flame, and does not burn the pulverized coal; #,4#å°ç‚‰ is a hot spot, it needs a neutral flame, can not use oxidized flame, otherwise the liquid surface will produce a dense foam layer, making clarification difficult; 5#, 6# small furnace is a clarification, homogenization zone, for burning Excess carbon powder does not color the glass and requires an oxidizing flame. When cerium oxide, arsenic oxide or the like is used as a clarifying agent, the atmosphere in the kiln is not particularly required. In addition, when producing color glass, the atmosphere system in the kiln is set according to the requirements of the coloring agent.
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