An aluminum melting furnace using flue gas backflow low oxygen high temperature combustion

Abstract

The invention relates to an aluminum melting furnace capable of performing low-oxygen high-temperature combustion through flue gas reflowing, and aims to effectively realize temperature control, decrease the content of nitrogen oxide and save energy in the melting process of the aluminum melting furnace. The aluminum melting furnace is characterized in that the top of an annular furnace wall surrounding the bottom of the furnace is provided with an annular arc-shaped top cover; a middle charging channel wall body is formed in a through hole in the middle part of the top cover; a charging and flue gas discharging channel is formed inside the middle charging channel wall body; a combustion melting hearth is formed in the annular furnace wall; the middle part of an exhaust hood on the top of the charging and flue gas discharging channel is provided with a furnace top cover; the periphery of the exhaust hood is provided with an exhaust hood outlet pipe; a combustor is arranged in the circumferential direction of the annular furnace wall; a flue gas outlet on the inner wall of the charging channel wall body is connected with the charging and flue gas discharging channel; the outer end of the flue gas outlet is connected with an inner ring of a flue gas converging annular channel; a flue gas converging main pipe communicating with an outer ring of the annular channel is connected with a flue gas reflow inlet through a flue gas reflow communication pipe; the annular furnace wall is provided with an operation furnace door and a molten liquid discharging hole. By adopting the aluminum melting furnace, control of the combustion temperature is realized, the combustion temperature is lowered, control of the content of the nitrogen oxide is realized, and the using amount of coal gas is reduced.

Description

technical field [0001] The invention relates to heat utilization equipment for smelting furnaces in industrial kilns, and is an aluminum melting (smelting) furnace which utilizes flue gas backflow, low oxygen, and high temperature combustion, and is especially suitable for burning high calorific value gas fuels. Background technique [0002] At present, in order to meet the requirements of energy saving and environmental protection, industrial furnaces and kilns obtain efficient and controllable complete combustion under the conditions of burning different gases in the combustion devices of heat utilization equipment, and effectively reduce nitrogen oxides (NO X ) and sulfide (SO X ) has become the main technical direction to finally achieve the goals of high efficiency, energy saving, environmental protection and safe use. For this reason, in the structural design of industrial furnaces and their combustion devices, in addition to achieving rapid and uniform mixing and sta...

AI Technical Summary

Problems solved by technology

Looking at the current structure of aluminum melting (smelting) furnaces and the various combustion devices and systems used, many of them have various problems in structure and performance caused by design concept problems, which will inevitably cause a gap between gas and air. Inhomogeneous mixing and incomplete combustion, and the inability to effectively control its combustion state

In particular, the combustion and heat transfer process in the aluminum melting (smelting) furnace has not been well resolved, mainly reflected in the fact that the energy loss caused by the difference between the combustion temperature and the use temperature is ignored (the energy level loss is not considered for the time being) , the method of increasing the excess air coefficient is usually adopted to meet the requirements of the process temperature, which is actually an invisible loss of energy at the high temperature end, which is also an important issue that people have long neglected in energy cascade applications

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