Drying method for ring-form calcining furnace

Abstract

The invention is a furnace-drying method for a ring type baking furnace, relates to a furnace-drying method for a 36-chamber ring type baking furnace in aluminum prebaked anode production. The invention is characterized in 360 furnace-baking curve is selected in the baking process, waste mature anode and qualified green body are mixed after the fifth chamber, igniting for furnace drying is startedat 2# and 20# chambers, the temperature of a flue without green body furnace in the prophase of furnace drying rises in ladder form, normal furnace baking is about to finish, when the starting chamber becomes a 4P chamber, the furnace-drying curve transits to a normal curve. According to the invention, water in mortar and bricks are discharged slowly and uniformly to sinter the mortar and clay bricks integrally, so that the upper temperature and lower temperature of a furnace body is indeed unified, the furnace body is free from deformation and crackle, and the service life of the furnace isextended.

Description

technical field [0001] The invention discloses an oven method for an annular roaster, relating to an oven method for a 36-chamber annular roaster in the production process of prebaked anodes for aluminum. Background technique [0002] In the production process of aluminum prebaked anodes, a new ring-type roasting furnace is newly built. Because the brick body and mortar contain a certain amount of water, it is necessary to discharge the water at a certain temperature and cycle, so that the mortar and clay bricks are integrated to ensure that the furnace body No deformation, no cracks. However, in the previous baking process, the temperature uniformity of the upper and lower sides of the furnace body could not be guaranteed. Usually, the local temperature of the furnace body was too high due to the difficulty of negative pressure control and the random discharge of a large amount of volatile matter, which caused premature deformation of the furnace body and lowered the furnac...

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Problems solved by technology

However, in the previous baking process, the temperature uniformity of the upper and lower sides of the furnace body could not be guaranteed. Usually, the local temperature of the furnace body was too high due to the difficulty of negative pressure control and the random discharge of a large amount of volatile matter, which caused premature deformation of the furnace body and lowered the furnace body. Shen, affecting the service life of the furnace chamber

[0003] At present, in the baking process of the roasting furnace, there are mostly two system ovens (such as 36 furnace chambers), which are ignited in 1# and 19# furnaces, of which 1#, 2#, 3#, 19#, 20#, 21# is filled with filling materials, and then the furnace chamber will be filled with qualified green bodies with a load oven. The maximum temperature of the fire path is usually controlled at 1200-1250 ° C for a 360-hour oven curve. This oven curve has the following disadvantages: 1. The sinking deformation of the starting furnace chamber is relatively large, up to 50-100mm. In this process, because there is no supply of preheated air in the early stage, it is difficult for the temperature of the fire path in the starting furnace chamber of the oven to reach the highest temperature of 1200-1250 ° C. Only a large amount of air can be supplied Natural gas and heat preservation can be barely achieved, and due to the low initial negative pressure of the oven, the temperature of the upper layer of the furnace body is too high, while the lower layer of the furnace body is still at a very low temperature, resulting in uneven temperature of the entire furnace body. It is very easy to cause the furnace body to deform and sink; second, the fourth furnace chamber is filled with green bodies, and the temperature rises rapidly during the period when a large amount of volatiles are discharged. The furnace room temperature is too high, the temperature of the anode rises too fast, and it is difficult to guarantee the control of product quality; thirdly, the furnace room with green body, due to the insufficient amount of preheated air in the early stage, makes it difficult for the temperature of the carbon anode to reach above 1100 ° C, except in the high temperature period Long-term heat preservation can be satisfied, which also reduces the service life of refractory bricks

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