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Combustion Characteristics of Coal and Char in Oxy-Fuel Technology

Author: ZhangHuiXing
Tutor: XuMingHou
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Oxygen / fuel Density Pulverized coal combustion Focal Burning Characteristics Reactive
CLC: TK16
Type: Master's thesis
Year: 2009
Downloads: 70
Quote: 0
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Abstract


Global warming, more and more of a threat to human survival environment. Studies have shown that CO 2 gas causing the greenhouse effect was most significant at the same time due to CO 2 longest existing in the atmosphere, thus causing a deep concern in the community. Pulverized coal combustion power plant will produce a large number of CO 2 energy system to control CO 2 method mainly includes: pre-combustion, gasification, oxygen / fuel combustion technology and post-combustion CO 2 recovery. Oxygen / fuel combustion technology is considered to be the plant control CO 2 emissions more economical method. Domestic and foreign scholars have been a lot of theoretical analysis and experimental study of oxygen / fuel combustion technology. This paper focuses on sub-density of pulverized coal combustion in oxygen / fuel combustion characteristics and mineral matter in coal conversion. The experiment, raw coal is divided into high, medium, low three different density section, the use of sedimentation stove (DTF) of different density in different oxygen content of raw coal, the different temperature test, the ash particles formed in the particle size distribution and chemical composition analysis . The results showed that in the case of the oxygen content of 20% and 30% of O and O 2 / N 2 / CO 2 atmosphere 2 atmosphere regardless of the burnout rate of pulverized coal combustion atmosphere. Studies have shown that the mineral ash O 2 / CO 2 the mineral transformation mechanism and O atmosphere 2 / N 2 atmosphere, but three kinds of density the phase relative content of coal mineral crystals have been some changes. O 2 / CO 2 the atmosphere xiasheng to ash particle size and O 2 / N 2 atmosphere compared , the smaller the ash particle size generated at lower temperatures. A direct impact on the entire pulverized coal combustion process due to the reaction time of the coke combustion process. In this paper, the sub-density coal in CO 2 atmosphere and N 2 physical structure of the atmosphere obtained CHAR char reactivity, and in O 2 / CO . 2 atmosphere and O difference between 2 / N 2 atmosphere when burning coal char combustion characteristics. The results showed that the CO 2 obtained under an atmosphere of fire and burn coke slightly ahead of schedule, the maximum weight loss rate is not N 2 atmosphere coke obtained large. Within the 500-750 ° C temperature range, the N obtained under an atmosphere of 2 coke ratio CO 2 coke reactivity. The char reactivity in the other temperature ranges of the temperature range is relatively close. Have improved compared to the coke obtained in the specific surface area and porosity of the coke obtained three density level of pulverized coal in CO 2 atmosphere and N 2 atmosphere . CO 2 atmosphere generated coke expansion rate is generally higher than the N 2 atmosphere generated coke.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Fuel and combustion
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