Change of brown coal oxidation kinetic characteristics by promoting additives appending in the form of copper salts

Результат исследований: Материалы для журналаСтатья

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Аннотация

Process of brown coal oxidation with 5%wt content of copper-salt additives of various nature (Cu (NO3)2, CuSO4 and Cu(CH3COO)2) was studied. The experiment has been performed by thermogravimetric analysis at a heating rate of 2.5°C/min to a maximum temperature of 600°C in the air. Analytical evaluation of oxidation process kinetic characteristics has been conducted based on the results of TGA. It has been established that addition of initiating agents leads to significant reduction in the initial ignition temperature of coal (ΔTi = 15÷40°C), shortening of the sample warm-up time to the ignition point (Δte = 6÷12 min) and reduction of the sample burning time (Δtf = 40÷54 min). The following series of additives activity affecting ignition temperature of coals has been established: Cu(CH3COO)2 > Cu(NO3)2 > CuSO4. Additionally, the opposite can be said about the effect of additives on residence time of the sample in its combustion area (CuSO4 > Cu(NO3)2 > Cu(CH3COO)2). According to mass spectrometric analysis, presence of NOx, SO2, CO2 (intense peaks at 190÷290°C) was recorded in oxidation products of modified samples, which is explained by partial or complete decomposition of salts.

Язык оригиналаАнглийский
Номер статьи012239
ЖурналJournal of Physics: Conference Series
Том891
Номер выпуска1
DOI
СостояниеОпубликовано - 10 ноя 2017
СобытиеInternational Conference on Problems of Thermal Physics and Power Engineering 2017, PTPPE 2017 - Moscow, Российская Федерация
Продолжительность: 9 окт 201711 окт 2017

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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