The main factors that affect the service life of anode baking furnaces

The normal service life of anode baking furnace is 8 to 10 years. However, in actual operation, it is difficult to achieve this time of 8 years because there are many factors that affect service life of the roasting furnace.

Generally speaking, the main factors that affect the service life of  anode baking furnace including quality of furnace construction materials, furnace construction quality, and oven quality etc.

1 Influence of the quality of furnace building materials

The quality of furnace construction materials have an important impact on service life of anode baking furnaces. Furnace building materials for anode baking furnaces are mainly Al2O3-SiO2 refractory materials. The quality requirements of refractory brick products include Al2O3 content, Fe2O3 content, K2O+Na2O content, refractory temperature, 0.2MPa load softening starting temperature, and pores. rate, bulk density, room temperature compressive strength, high temperature flexural strength, high temperature creep rate, heating permanent line change rate and thermal shock stability. During the anode roasting production process that lasts for 5 to 8 years, a large amount of alkali metal K and Na from anode carbon block are absorbed by the Al2O3-SiO2 refractory material, which will cause damage to the refractory material structure, thus accelerating the degradation of the anode roasting furnace refractory bricks. Invalid.

2 Influence of furnace construction quality

On the premise that quality of refractory materials is guaranteed, furnace building process is one of the important factors affecting the service life of anode baking furnace. During masonry construction, masonry construction should be carried out strictly in accordance with the pre-established masonry plan. However, in actual operation, problems such as insufficient mortar saturation in the brick joints and asbestos felt not being used in places where asbestos felt should be used for sealing may occur. As a result, the gaps between fire path wall bricks are too large and the sealing degree is not enough, resulting in serious air leakage and filling material leakage during normal use of the roasting furnace. These masonry defects will have an adverse impact on the service life of the anode roasting furnace.

3 Influence of oven quality

The purpose of the roaster oven is to discharge the moisture in the furnace so that the entire furnace chamber achieve the best use effect. Therefore, roaster oven quality directly affects kiln service life. During the baking process of the roaster, fire channel temperature will reach or exceed 1200°C, which seriously damages internal structure of refractory material and leads to destruction of the load softening performance. The heating rate has a great influence on the baking effect of the roaster, especially in the initial stage of the oven. Since the masonry is at normal temperature, if the heating rate is too fast,larger thermal stress and stress concentration will be formed in the refractory material, causing cracks in masonry, thereby reducing the service life of the roasting furnace. In addition, after roasting furnace is finished, if furnace temperature is relatively high, the cooling rate will also cause a large stress concentration in the furnace body, resulting in cracking of the furnace body. Both of these will have adverse effects on the roasting furnace. Serious impact on service life.