Mechanism of the Suppression of Sulfur Oxides in the Oxidative Thermolysis Products of Coals upon Their Combustion in a
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anism of the Suppression of Sulfur Oxides in the Oxidative Thermolysis Products of Coals upon Their Combustion in a Mixture with Dispersed Wood G. V. Kuznetsova,*, S. A. Yankovskiia,**, A. A. Tolokol’nikova,***, and I. V. Cherednika,**** a Tomsk
Polytechnic University, Tomsk, 634050 Russia *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] ****e-mail: [email protected]
Received January 10, 2020; revised January 23, 2020; accepted February 10, 2020
Abstract—The thermal decomposition of the mixtures of crushed coal and wood was experimentally studied in a temperature range from 400 to 1000°C. According to the results of the experiments, the possibility of using wood as an additive to mixed fuel based on coal to decrease the yield of sulfur oxides upon combustion in large- and small-scale power boilers was confirmed. With a decrease in the energy characteristics (calorific value) of these mixed fuels by no more than 9%, as compared with widely used homogeneous grade T coal, the environmental parameters were significantly improved on the combustion of a mixture of coal and wood. It was found that a significant synergistic effect on the sequestration of sulfur oxides was achieved during the formation of calcium and aluminum sulfates in the ash of mixed fuel due to the joint thermal decomposition of coal and wood particles at a wood fraction from 10 to 50% in the mixture. Keywords: coal, wood biomass, mixed fuel, thermal decomposition, combustion, elemental composition, X-ray phase analysis DOI: 10.3103/S0361521920030076
INTRODUCTION In the context of negative forecasts for oil and gas reserves, which can ensure the operation of energy generation complexes of the world community [1], coal is becoming increasingly important, and the explored coal reserves will be sufficient for more than 200 years [2]. However, the burning of both hard and brown coal leads to the emission of large volumes of anthropogenic oxides, primarily, sulfur, nitrogen, and carbon oxides, into the atmosphere [3]. Therefore, the modernization of fuel burning technology at coal power plants in order to decrease the mass of anthropogenic oxides emitted by thermal power plants is a problem of considerable current interest [4]. According to published data [5–8], one of the most promising solutions to such problems is the burning of coal together with other substances or materials in composite (or mixed) fuels. Currently, the best known technologies include the combustion of coal–water [5] and organic coal–water fuels [6] and coal mixtures with biomass (primarily, wood) [7, 8]. However, despite numerous attempts (including successful ones) to co-burn various types of biomass with coal [9–15], there is still no theory that could be
used in research and development works for designing large- and small-scale power boilers burning fuel mixtures of coal and wood. Mechanisms of the sequestration of anthropogenic oxides formed upon the joint burning of the mixtures with chopped wood have not yet been establis
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