Abstract
Experiment of oxidation characteristics with slow velocity of high volatile blended coals was investigated in the surroundings of low oxygen conditions, which gives three kinetic factors in the step of low temperature through the methods of thermo gravimetric analysis, the Coats-Redfern integration and Achar-Brindley-Sharp-Wendworth. The results of calculation show that activation energy and pre-exponential factor increase with the reaction process, and tendency of spontaneous combustion of the blended coal have changed. The experimental results show that the type of absorbing oxygen is mainly physical adsorption and calorific value is very small during increasing weight. Volatile of blended coal releases before single coal and combustion temperature of blended coal is between one and other single coals. If the oxygen content is below 16% in the milling system, explosion-proof effect on high volatile blended coal can be obtained.
Highlights
Adding inert medium in power station boiler system can reduce the oxygen concentration and realize the inhibition of combustion reaction
Aiming at high volatile Huolinhe lignite and three kinds of typical northeast bituminous coal preparation of mixed coal, according to high volatile coal explosionproof technology index at home and abroad [9,10], the application of thermal analysis technology develops slow oxidation experiment in the surroundings of low oxygen atmosphere with 12%, 14% and 16% oxygen and dynamic analysis, and it is concluded that oxidation characteristics parameters of coal and dynamic parameters of characterization of pulverized coal self-ignition orientation, that is for slow oxidation experiment research in oxygen atmosphere, providing theoretical basis for explosion-proof design and operation of bituminous coal boiler burning with lignite
Coal samples are from Huolinhe lignite (HLH), Fuxin bituminous coal (FX), Fushun bituminous coal (FSH) and Tiefa bituminous coal (TF).The average particle size is 53 μm
Summary
Adding inert medium in power station boiler system can reduce the oxygen concentration and realize the inhibition of combustion reaction. It can eliminate the pulverized coal spontaneous combustion and ignition source. Considering the drying requirements of lignite, bituminous coal boiler burning with lignite is difficult to meet explosion index above, so research on oxidation characteristics of high volatile blended coal in the surroundings of low oxygen atmosphere is carried on in this paper. Aiming at the particle size with 150 μm and oxygen concentration with 21%, research of coal oxidation spontaneous combustion begins, which is carried on in reference [1,2,3]. Aiming at high volatile Huolinhe lignite and three kinds of typical northeast bituminous coal preparation of mixed coal, according to high volatile coal explosionproof technology index at home and abroad [9,10], the application of thermal analysis technology develops slow oxidation experiment in the surroundings of low oxygen atmosphere with 12%, 14% and 16% oxygen and dynamic analysis, and it is concluded that oxidation characteristics parameters of coal and dynamic parameters of characterization of pulverized coal self-ignition orientation, that is for slow oxidation experiment research in oxygen atmosphere, providing theoretical basis for explosion-proof design and operation of bituminous coal boiler burning with lignite
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