Sustainable Mining and Metallurgy

The alumina production process of a company used atmospheric condenser to absorb exhaust steam, and the heat of exhaust steam and condensate water were not fully utilized. Furthermore, the cooling tower needed to consume a large amount of circulating water, and the power consumption of circulating pump and cooling tower fan was high. In order to recover the waste heat of exhaust steam, through the comparison of schemes, the first type of vapor-cooled absorption lithium bromide heat pump was selected, and the circulating water system of evaporator was reformed to directly recover the latent heat of exhaust steam in the final evaporator of evaporation process, so as to make it become a heating source. Exhaust waste heat recovery can produce about 11.3 million yuan per year, and replace the boiler coal-fired heating, greatly reducing air pollution emissions.