A method for secondary drying after the calcining furnace is shut down

Abstract

The invention discloses a method for secondary oven baking of a calcining furnace after blowing out. The method comprises the steps that first discharging is normally performed before blowing out, anddischarging is stopped when calcined cokes are discharged to a second layer; after stopping discharging, the negative pressure and furnace temperature of the tank type calcining furnace are reduced;after volatiles of the tank type calcining furnace are fully burned, a first-layer volatile pulling plate, an eighth-layer preheated air damper and a flue shutter are closed, sealing and heat preservation are performed, and the tank type calcining furnace is naturally cooled; when oven baking, the flue shutter is first opened, and then an eighth-layer negative pressure pulling plate is opened to ensure the negative pressure required by oven baking; after the discharging requirements are met in the later stage of oven baking, discharging is performed until the volatiles overflow, and the volatile pulling plate is opened to enable the volatiles to enter a volatile avenue for burning; and after the production change requirements of oven baking are met, a bottom layer preheated air door is opened to restore the operation of the normal tank type calcining furnace. The method reduces mass labor intensity, reduces the amount of natural gas used and accelerates the actual production change ofoven baking under the premise of ensuring safety and environmental protection, thereby greatly improving the economic benefits of prebaked anode production enterprises.

Description

technical field [0001] The invention relates to a method for baking a calciner, in particular to a method for secondary drying of the calciner after the shutdown of the calciner. Background technique [0002] The tank-type calcination furnace must be baked before starting. The purpose of the furnace is to discharge a large amount of moisture in the bricks and mortar. In addition, the tank-type furnace uses a large number of silica bricks. The crystal form of the silica bricks changes at different temperatures, and the volume changes. The furnace must be carried out according to a certain heating curve. [0003] Due to various reasons, the carbon industry has the phenomenon that the tank calciner has been shut down for a long time, and the secondary oven needs to be restarted after the shutdown. At present, most of the tank-type calciners are shut down by emptying the calcined coke in the material tank, adding calcined coke to the furnace again and re-baking with a long furn...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for secondary drying of the calciner after the shutdown of the calciner, which can solve the problems of long drying time, slow conversion of production and high cost of natural gas consumption

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