A roasting furnace roasting control method

Abstract

The invention relates to a roasting furnace roasting control method. The method comprises the steps that roasting product green bodies and filler are fed through inlets in the tops of workbins and operate from top to bottom under the effect of self weight, high-temperature flue gas in flues on the two sides flows from bottom to top, and an indirect countercurrent heating mode is formed; the flues are partitioned into a forced heating section and a natural heating section according to temperature levels of all layers inside the flues, flue temperatures of the forced heating section are controlled to be within target temperature ranges mainly through fuel added from nozzles, and the temperature levels of the all layers of the flues of the natural heating section are mainly maintained through combustion of volatile matter precipitated from roasting products; and the workbins are also partitioned into a preheating section, a heating section and a cooling section according to temperature levels of materials in the workbins during falling, the heating rates, the final roasting temperatures and the tapping temperature levels of the materials in a roasting furnace are controlled through the flue temperatures, and the high-temperature roasting and cooling process of the products is completed. Manual operation is greatly reduced, and the novel roasting furnace is made to have a higher automation level and higher system stability.

Description

technical field [0001] The invention relates to a roasting furnace, in particular to a roasting furnace roasting control method used in the carbon industry for roasting aluminum prebaked anodes, cathodes, electrodes and other carbon products. The control method of the temperature rise curve of the products in the box. Background technique [0002] In the carbon industry, the main equipment used for the roasting of carbon products includes open ring roasting furnaces, covered ring roasting furnaces, tunnel kilns and car bottom furnaces. Among them, the open ring roaster and the covered ring roaster are the two main equipments for the roasting of carbon products. Each furnace chamber undergoes the periodic roasting process of preheating, heating and cooling. The roasting of these two equipments mainly has the following disadvantages: [0003] (1) Since the ring roaster belongs to a periodical heating equipment, during the roasting process, all refractory materials in the fur...

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Problems solved by technology

[0003] (1) Since the ring roaster belongs to a periodical heating equipment, during the roasting process, all refractory materials in the furnace body will also experience the heating and cooling of the entire roasting process, so a large amount of heat will be used to heat the refractory materials in the furnace body, resulting in The thermal efficiency of the roasting furnace is only about 30%, which is relatively low

[0004] (2) The ring-type roaster needs to be equipped with a furnace room, a furnace room, a maintenance furnace room and a sealed furnace room, etc. Nearly 1 / 3 of the furnace rooms are not in the heating and cooling furnace rooms during the entire roasting process, resulting in A large number of furnace body refractory materials are idle, which is also the main reason for the high investment cost and large floor area of ​​ring type furnace refractory materials

[0005] (3) The furnace surface equipment needs to be moved every time the furnace is moved, which not only requires the cooperation of the crane and a large number of operators, but also the system will be in a ceasefire state when the furnace is moved, and the fire path will experience a relatively large drop in temperature. When the system is restored, a large amount of fuel needs to be added to make the temperature in the furnace reach the temperature set by the predetermined curve, resulting in a lot of waste of energy, and the volatile substances escaping from the flue during the furnace move will also cause a certain degree of pollution to the workshop environment

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