Energy-saving combustion and waste heat recovery system for fast melting aluminum furnace

Abstract

The invention provides an energy-saving combustion and waste heat recovery system of a quick aluminum melting furnace. The energy-saving combustion and waste heat recovery system of the quick aluminummelting furnace comprises a furnace body, a combustion system and a waste heat recovery system. The furnace body comprises a vertical melting furnace and a transverse holding furnace. The combustionsystem comprises a first fuel spray nozzle, an ignition nozzle and an air spray nozzle, wherein the air spray nozzle is used for guiding the preheated air into the holding furnace in the mode that thepreheated air serves as the combustion-supporting gas. The waste heat recovery system comprises a first heat storage chamber, a second heat storage chamber and a reversing device. The purposes that the heat storage chamber on one side stores the waste heat generated by combustion of the melting furnace, the heat storage chamber on the other side preheats the combustion-supporting gas of the holding furnace, and the operation is alternatively conducted according to the preset time cycle are achieved. The problems that in the prior art, a melting furnace and a holding furnace are low in waste heat recovery efficiency and high in the waste heat recovery difficulty, and due to the fact that the combustion temperature in the melting furnace is high, thermal power type NOX is prone to being generated when the air serves as the combustion-supporting gas are effectively solved, the overall energy consumption of the combustion system is reduced, the flue gas of the system is effectively balanced, and the waste heat recovery efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of metal aluminum smelting, in particular to an energy-saving combustion and waste heat recovery system for a rapid aluminum melting furnace. Background technique [0002] The aluminum melting furnace is a new type of high-efficiency energy-saving furnace developed according to the aluminum smelting process. It can well meet the requirements of the aluminum smelting process: strict alloy composition requirements, discontinuous production, and large single furnace capacity. It has the advantages of reducing consumption, It has technical effects such as reducing burning loss, improving product quality, reducing labor intensity, improving working conditions and increasing production efficiency. It is suitable for intermittent operations, smelting with a lot of alloys and recycled materials. [0003] With the improvement of production technology and technological level, a new type of fast energy-saving aluminum ...

AI Technical Summary

Problems solved by technology

Furthermore, as mentioned above, the materials are fed from the furnace mouth at the top of the melting furnace, and the feeding method is usually intermittent feeding in batches. Therefore, there are also large differences in the combustion of the furnace charge inside the melting furnace and the amount of the remaining charge. Based on this, it is difficult to control the exhaust gas temperature of the melting furnace from the combustion system in the existing technology

In addition, due to the high combustion temperature in the melting zone of the charge in the melting furnace, if air is directly introduced as a combustion-supporting gas during the combustion process, thermal NO is easily generated during the combustion process. X

[0005] On the other hand, in the rapid aluminum melting furnace in the prior art, due to the preheating of the charge to be burned, the melting capacity of the aluminum melting furnace is significantly enhanced, and part of the high-temperature flue gas of the holding furnace is directly discharged, resulting in the inefficient use of fuel heat; The traditional heat storage method will lead to a decrease in the melting capacity of the rapid melting aluminum furnace, which cannot match the melting capacity of the rapid melting furnace in the rapid melting aluminum furnace. Contradictions in thermal capacity

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