Energy Efficiency Assessment of Coal Preparation Plants Waste Processing
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Vol. 61, No. 3, September, 2020
ENERGY EFFICIENCY ASSESSMENT OF COAL PREPARATION PLANTS WASTE PROCESSING O. A. Evtekhova,1,2 I. A. Pribytkov,1 and K. S. Shatokhin1 Translated from Novye Ogneupory, No. 6, pp. 5 – 8, June, 2020.
Original article submitted December 27, 2019. The chemical composition and the amount of waste from coal preparation plants are analyzed. The main characteristics of the gasifying gas under various conditions of fuel combustion are studied. The impact of the carbon content in waste on the main characteristics of the gasification process is estimated. The analysis of the influence of various properties of the gas generated as a result of gasification on the heat engineering parameters of the process of its combustion for the needs of the consumer is carried out. The studies were carried out on the basis of software for calculating the process of fuel combustion, waste gasification and gasification products afterburning. Studies have shown that gasification is the most promising way of using waste from coal preparation plants compared to burning. When choosing the most effective way to use the chemical energy of carbon-containing waste, it is necessary to take into account such factors as: the carbon content in the waste, the heating temperature of the combustion air, the ratio of N2 and O2 in the air. Keywords: carbon-containing waste, coal gasification, chemical energy of carbon-containing waste.
The growing economy of any country requires an increasing amount of energy, including thermal one [1, 2]. The thermal energy deficit can mainly be covered in two ways: rational and efficient use of already existing reserves and the development of alternative sources [3 – 16]. One of the ways to solve the problem of energy deficit is to use human-induced waste as one of the types of secondary energy resources [5, 17]. In the metallurgical complex of the country, these include the heat of cooling water, heat of the cooling metal, physical heat of process gases, etc. [15]. Despite the development of nuclear-power engineering and progress in the use of renewable energy sources, oil, gas and coal remain the dominant energy sources, fueling the global economy, accounting for more than three quarters of the total energy supply by 2035 (compared to 85% in 2015) [4]. Russia has the second largest coal reserves in the world after the United States of America. It accounts for about 18% of the world’s reserves [14]. As of 01.01.2019, coal mining in the Russian Federation was carried out by 166 coal enterprises, including 57 mines and 109 open-pit mines [10]. The total production capacity at the end of October 2019 for coal 1 2
mining was 359.1 million tons [11]. In Russia, hard coal is mainly mined. Almost all of the coking coal mined in the Russian Federation is prepared. According to the project of the program for the development of the coal industry in Russia, it is planned to increase the volume of coal production till 2035. The share of coal to be prepared should also increase. The result of the work of
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