Analysis On Exergy Efficiency Of Chinese Smelting And Pressing Of Primary Metals

Improving of resource and energy efficiency is an important problem in the environment resources utilization and management. This paper selects the output of Chinese major metals, the annual energy consumption data and non-energy consumption as samples, employing the extended exergy theory, production function theory and data envelopment analysis theory to analysis exergy efficiency of Chinese high-energy industry-non-ferrous and ferrous metal smelting and pressing industry and the smelting of non-ferrous metals. Specific research work includes the following three aspects:(1) Analysis exergy efficiency of Chinese major non-ferrous metals and ferrous metal of smelting and pressing industry based on the production function. By extended Exergy theory we convert the energy and non-energy inputs into exergy of energy and exergy of non-energy. The outputs are converted into types of metal exergy. Production function model of non-ferrous metals of smelting and pressing and ferrous metals of smelting and pressing are constructed based on the production function. Paper finds that the exergy of energy input is more significant than the exergy of non-energy inputs for the over all output. In the non-ferrous metal smelting and pressing industry, exergy of energy consumption of coal and electricity are much greater than other types of energy exergy consumption; while in the ferrous metal smelting and pressing industry, coal, coke and electricity are the main energy exergy consumption. When we contrast the two industries, exergy efficiency of non-ferrous metal smelting and pressing industry extended and then increased at first and then decreased; while the exergy efficiency of ferrous metal smelting and pressing industry is rising with fluctuations.(2) The exergy efficiency of Chinese main metals of smelting and pressing industry based onthe production function analysis. In this paper, non-ferrous metals of smelting and pressing industry and ferrous metals of smelting and pressing industry are defined as metals of smelting and pressing industry. There are two inputs, exergy of energy input, exergy of non-energy inputs and one exergy of metals output. Production function model of metals of smelting and pressing is constructed based on the production function. The paper finds that exergy of energy input is more significant than the exergy of non-energy inputs for the overall output. In metal smelting and pressing industry, coal, coke and electricity are the main energy exergy consumption. The exergy efficiency of metals of smelting and pressing industry is rising with fluctuations. Comparing ferrous metal smelting and pressing industry, the effect of the exergy of energy input in nonferrous metal smelting and pressing the industry is more significant.(3) Relative exergy efficiency of Chinese main non-ferrous metal smelting industry based on data envelopment analysis. By data envelopment analysis, measure the different types of metals in the different rate of return relative exergy efficiency in the smelting process. The study finds that the different rates of return relative exergy efficiency of different scenarios of copper, aluminum, lead, zinc and tin. Exergy efficiency of copper is relatively low while the exergy efficiency of aluminums the highest in all situations. Exergy of energy consumption and carbon dioxide emissions of lead and zinc and aluminum metal unit exergy output is relatively high.By studying these three aspects of Chinese metal smelting and pressing industry input-output exergy efficiency some suggestion are given to policymakers.