Roasting furnace and roasting method

Abstract

The invention relates to a roasting furnace and a roasting method. The roasting furnace is composed of one or more units. Each unit is provided with four workbins and four flues, wherein the four workbins are distributed in the shape of a Chinese character 'tian' which means 'fields', the two sides of every two vertical workbins of the four workbins are provided with two flues, and each unit is provided with the four flues. The roasting furnace and the roasting method have the following advantages that the thermal efficiency of the roasting furnace is improved, the energy consumption level of the roasting process is lowered, and the production cost of the roasting process is lowered; the service life of a furnace body is greatly prolonged; the utilization efficiency of a refractory material of the furnace body is improved, and the investment cost of the roasting furnace is lowered; products in the workbins and high-temperature flue gas in the flues operate in a countercurrent mode, and high-temperature zones and low-temperature zones of the flues and the workbins have the same variation trend; and furthermore, through control of temperature thermocouples and negative pressure in the flues, it can be guaranteed that good temperature distribution in the flues is achieved, the products in the workbins can have controllable heating rates, and the product quality is guaranteed.

Description

technical field [0001] The invention relates to a roasting furnace, in particular to a roasting furnace and a roasting method used in the carbon industry for roasting and heating carbon products such as aluminum prebaked anodes, cathodes and electrodes. 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 roasting furnace is mainly used for roasting prebaked anodes, and a few are used for roasting electrodes and cathodes; the covered ring roasting furnace is mainly used for roasting electrodes and cathodes; the tunnel kiln is mainly used for electrodes and special carbon The secondary roasting of plain products; the car bottom furnace is mainly used for the roasting of electrodes and cathodes. The above types of roasting furnaces have their own characteristics: [0003] (1) The ope...

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Problems solved by technology

[0004] (2) The cover-type ring roasting furnace has the characteristics of strong product adaptability and slow heating rate, but the furnace has the disadvantages of high energy consumption and large product temperature difference.

[0005] (3) The general calcination temperature of tunnel kiln is about 900~1000℃, the temperature uniformity of the product is good, but the final temperature level is low, so it is only suitable for the secondary calcination of carbon products

[0006] (4) The car bottom furnace has the characteristics of precise temperature control and uniform temperature in the furnace, but the energy consumption level of the furnace is very high and the economy is poor

[0008] (1) The ring roaster is a periodic heating equipment. During the roasting process, all the 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. The heat stored in the body is ineffective heat, resulting in a relatively low thermal efficiency of only about 30%.

[0009] (2) According to the production process requirements of the ring-type roaster, it is necessary to set up a furnace room, a furnace room, a maintenance furnace room and a sealed furnace room, etc., and these furnace rooms account for about 1 / 3 of the total number of furnace rooms, causing a large number of The refractory materials of the furnace body are idle, which is also the main reason for the high investment cost and large area of ​​the refractory materials of the ring furnace

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