Research On Waste Heat Recovery And Reuse Of Typical Nonferrous Metallurgy Flue Gas

Nonferrous metallurgy is a high-energy industry. In the energy consumption constitute, the residual-heat resource makes up about60%of the total energy consumption, and the proportion of flue gas waste heat up to80%in the residual-heat resource. Therefore, reusing the waste heat of nonferrous metallurgy flue gas has important significance for reducing the energy consumption of nonferrous metallurgical industry. However, there is such great potential of waste heat recovery and reuse of nonferrous metallurgy flue gas due to the inherent characteristics of nonferrous metallurgy flue gas and currently flue gas recovery problems. So, we take copper pyrometallurgy, aluminum smelting and zinc pyrometallurgy as the examples, and select typical non-ferrous metal smelting equipment to research the waste heat recovery and reuse of nonferrous metallurgy flue gas.In the paper, we use the exergy of flue gas to evaluate the value of waste heat recovery and reuse of flue gas, the energy level of flue gas to measure the quality of flue gas residual-heat resource. The flue gas residual-heat resource of the typical process of copper pyrometallurgy, aluminum smelting and zinc pyrometallurgy are analyzed respectively and are based on the quantity, quality of flue gas and the requirements of customers and the grade recovery principle of energy level matching. At the same time, we choose the appropriate recovery method of flue gas, and construct respectively the whole model of waste heat recovery and reuse of flue gas in different process.In the process of copper pyrometallurgy, we take current relatively advanced, the most widely used flash smelting furnace, converter and rotary anode furnace as the examples, the waste heat resources of the process of matte smelting, the process of matte converting and the process of fire refining of blister copper in copper pyrometallurgy are analyzed respectively. Meanwhile, based on the way of using waste heat reasonably to suitable heat consumer in production process and the grade recovery principle of energy level matching, the model of waste heat recovery and reuse of flue gas in copper pyrometallurgy is constructed, and the result analysis of waste heat recovery for using this model in the annual output three hundred thousand tons copper enterprise is made. In the process of alumina production, we take the process of alumina production by sintering method as the example, analyzing respectively the waste heat resources of the process of clinker sintering, the process of lime-roasting and the process of aluminium hydroxide calcinations. And based on recovery principle of flue gas waste heat, the model of waste heat recovery and reuse of flue gas in alumina production is constructed, and the result analysis of waste heat recovery for using this model in the annual output four hundred thousand tons alumina enterprise is made. In the process of electrolytic aluminum production, we analyze respectively the waste heat resources of the process of large pre-baked electrolytic cell production, the process of petroleum coke calcinations and the process of green anode sintering. And based on recovery principle of flue gas waste heat, the model of waste heat recovery and reuse of flue gas in electrolytic aluminum production is constructed, and the result analysis of waste heat recovery for using this model in the annual output fifty thousand tons electrolytic aluminum enterprise is made. In the process of zinc pyrometallurgy, we take the process of zinc smelting by blast furnace as the example, analyzing respectively the waste heat resources of the process of lead-zinc updraft sintering, the process of blast furnace smelting, the process of crude zinc rectifying and the process of treatment slag by fuming furnace. And based on recovery principle of flue gas waste heat, the model of waste heat recovery and reuse of flue gas in zinc pyrometallurgy is constructed, and the result analysis of waste heat recovery for using this model in the annual output eighty thousand tons electrolytic zinc smelting by blast furnace enterprise is made.