Method and device for utilizing waste heat of sintering system

Abstract

The invention belongs to the field of production of aluminum oxide and specifically relates to a method and a device for waste-heat utilization of a sintering system; the device comprises the sintering system, a cooling machine, an indirect heating type hot blast heater, three-level air pre-heaters, a dust collector a fan and air pipes for communicating with equipment; in the sintering system using the hot air, provided by the indirect heating type hot blast heater, as a heat source, three-level heat exchangers are respectively used for enabling the tail gas of a sintering kiln, the tail gas of the cooling machine and the waste gas of a combustion chamber of the hot blast heater to exchange heat with fresh air before entering the hot blast heater, so that the temperature of the fresh air rises and the temperature of the three waste (tail) gases is reduced. Partial heat in the tail gas of the sintering kiln, the tail gas of the cooling machine and the waste gas of the combustion chamber of the hot blast heater can be recovered effectively, so that the energy consumption of the whole sintering system is reduced and the production cost is saved; and meanwhile, itself temperature can be reduced and the dust collection and discharge can be facilitated. The method is simple in process and low in equipment investment.

Description

technical field [0001] The invention belongs to the field of alumina production, in particular to a waste heat utilization method and device of a sintering system. Background technique [0002] In the production of alumina and other industrial production processes using sintering systems, under certain technical requirements, indirect heating hot blast furnaces are used to provide hot air for the sintering system as a heat source. In this case, the entire sintering system including the hot blast stove will produce three tail (waste) gases, namely: sintering system tail gas, cooler tail gas and hot blast stove combustion chamber exhaust gas. The temperature of these three kinds of tail (waste) gases are all high, if waste heat recovery is not carried out, it will lead to a lot of waste of energy and increase the energy consumption of the whole production system; at the same time, if the above tail (waste) gas is not cooled, The material requirements of the follow-up tail (ex...

AI Technical Summary

Problems solved by technology

The temperature of these three kinds of tail (waste) gases are all high, if waste heat recovery is not carried out, it will lead to a lot of waste of energy and increase the energy consumption of the whole production system; at the same time, if the above tail (waste) gas is not cooled, The material requirements of the follow-up tail (exhaust) gas dust collection equipment will be increased, thereby increasing equipment investment

Images