Industrial Silicon Production System Energy Flow And Energy Research

China is one of the countries which are lack of energy seriously, and it will be the largest energy consumer in the short run. The saving and reasonable use of energy is not only an urgent task to ease the strain of energy, but also a long-term strategic task. Same as the industry of iron and steel or electrolytic aluminum, metallurgical silicon industry, is a high energy-consuming industry of resource products. In China, the consumption of metallurgical silicon's unit exceeds 10%-20% of international advanced level, up to 12000-14000 kWh/t. As one of the most metallurgical silicon production and export countries, improving the quality and reducing energy consumption to improve the competitiveness are very necessary. Therefore, whatever the economic benefit or energy-saving, it has become the key for survival and development of the metallurgical silicon's enterprises to reduce energy consumption and improve energy utilization.Based on the quantities equilibrium for 1 ton metallurgical silicon produced with carbothermic reduction, the whole course of balance calculating about the quality, the energy and the exergy in the system of the metallurgical silicon electric arc furnace were realized through the program of VB6.0. We analyzed the data collected from the factory in China. The transformation, utilization and wasting of energy was calculated, analyzed and discussed. The results of the energy and exergy calculation were shown in the Grassmann Diagram of energy flow and exergy flow. Analyzed from the energy balance and exergy balance, they are totally different. Energy is of quantity and quality. While the law of conservation of energy only considers the relations of its quantity, ignores the quality of it, which means, the effective transformation. Exergy analysis is scientific, rational and advanced, because it expresses part of the energy which can theoretically transform into useful work.As the data of domestic industry an example, the analytical results indicate that the energy utilization efficiency is 51.08%, the exergy utilization efficiency is 32.21%, which is lower than energy utilization efficiency. The non-reversible exergy losse which is 51.17%, is the dominant exergy losses. Combustion and chemical reaction is the important part of non-reversible exergy losse, they are 55.5%,38.79% and 0.27%. Other losses are from the heat of the product, the electrical equipment, dissipated heat and the heat of cooling water, they are 40.52%,4.31%,3.64% and 0.37%.Consequently, some measures for exergy-saving had been proposed to enhance the exergy utilization efficiency based on analyzing large numbers of data by MATLAB language, and summing up some linear formula. Keywords:metallurgical grade silicon, electric arc furnace, exergy, exergy flow, energy-saving...