Abstract
The paper discusses the concept of developing schemes for the utilization of low potential secondary energy resources waste heat in heat transformers (HT). There ara several examples of using HT in non-ferrous metallurgy plants in Russia and Kazakhstan: the production of nickel, zinc and ferroalloys. In the case of nickel production, two schemes are proposed for consideration: for summer and winter modes. The main object of study is a nickel production scheme using a lithium bromide absorption chiller (AbCh) in the summer. The nickel production process needs cold. In the proposed scheme, the main source of utilized low-grade waste heat for AbCh is recycled water. The basic parameters were calculated under various extreme conditions, the energy effect of the circuit modernization was estimated, and equipment was selected. Another example of the HT use is the use of a heat pump unit (HPU) in the production of zinc and ferroalloys. HPU is designed to heat feed water before chemical water treatment and at the same time to “cool down” the circulating water, which is then used for electrolysis, replacing purchased artesian water.
Highlights
Due to a decrease in the quantity of fossil fuels, its rise in price on the world market and aggravation of environmental problems, energy efficiency increasing through the use of secondary energy resources (SER) has become more relevant and is gaining world significance The scarce of SER use leads to thermal pollution of the environment [1]
This heat transforms into the heat of hot water, suitable for the needs of hot water supply (HWS), heating or ventilation of an enterprise [4,5,6,7,8]
- in summer period after nickel production unit (NPU) reaction heat recovers for heating the return water of the heating network and cold feed water of the thermal power plant boiler it is cooled to 20°C in absorption chiller (AbCh) [9]
Summary
Due to a decrease in the quantity of fossil fuels, its rise in price on the world market and aggravation of environmental problems, energy efficiency increasing through the use of secondary energy resources (SER) has become more relevant and is gaining world significance The scarce of SER use leads to thermal pollution of the environment [1]. Non-ferrous metallurgy should be given special attention, since there is a large amount of excess heat in it in the form of industrial effluents or reverse cycles. This excess heat can be used in HT to generate cold or heat with a higher potential [2, 3]. The article discusses the modernized nickel production technology in Russia, which requires constant maintenance of the circulating water temperature level at the inlet to the production of not more than 20 °C in winter and summer
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