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The Investigation on Blended Coal Combustion Characteristics Based on Different Blended Way

Author: MoHuiLong
Tutor: LiuLiang
School: Changsha University of Science and Technology
Course: Power Machinery and Engineering
Keywords: Blended way Mixed coal Burning Characteristics Thermal gravimetric analysis Kinetic parameters
CLC: TK227.1
Type: Master's thesis
Year: 2009
Downloads: 179
Quote: 0
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Abstract


The supply of coal resources, lack of transportation, electricity fueled with low-quality coal policy as a result of the difficult to stabilize coal-fired utility boilers burning design coal. In order to reduce costs as much as possible to meet the requirements of the National Pollutant Discharge policy, more and more power plants begin burning with mixed coal mixed with low-quality coal. Mixed coal combustion is an extremely complex physical and chemical processes in pulverized coal combustion process, between the coals pulverized coal mutual influence and mutual restriction, showed mixed coal combustion characteristics different from the single coal. Due to the the coals ever-changing, and the deviation from the design coal, such as combustion stability, slagging, elevated pollutant emissions This gives the safe operation of the boiler. Study mixed coal combustion characteristics have important significance for solving problems and better play to the superiority of the mixed coal, as well as boiler design and control of the combustion process. In recent years, more and more mixed coal combustion characteristics, but few different blend mixed coal combustion characteristics affect. A first blending mode \grinding \Select a power plant in Hunan, a typical anthracite and a typical bituminous coal, starting from two different blending the pulverized coal industrial analysis experiments, particle size distribution experiments, the TGA experiment as well as the horizontal pulverized coal combustion test . Industrial analysis experiments found that the the blended coal volatile content increased with increasing Pingmei Cheonan content after the first grinding mixed blend manner resulting mixed volatile content of the coal is higher than the first mixed after grinding. The particle size distribution of experimental mixed blending mode mixed coal fines in proportion compared to the first mixed grinding way more than the first mill. TGA experiments on two different blending mode mixed coal ignition temperature, the burning ember temperature, maximum weight loss rate and the corresponding temperature study, and the use of flammable index, the stable combustion index as well as the comprehensive index of combustion characteristics to verify the different blend mode the pros and cons of different blends mixed coal combustion characteristics. Coats-Redfern integral method for different blending mode blended coal combustion kinetics parameters were calculated from the Arrhenius law; come under the experimental conditions of this article, a response is not suitable for all specimens, and the use of the activation energy obtained the frequency factor and further validate the conclusions of the first blend way better than the second way. In a power plant, industrial test, further illustrates the superiority of the first blended approach. In short, a semi-industrial tests and power plant industrial test experimental industrial analysis, particle size distribution experiments, TGA experiments, as well as horizontal pulverized coal combustion can be drawn first blending mode mixed coal combustion characteristics superior to the second doped mixed way.

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CLC: > Industrial Technology > Energy and Power Engineering > Steam Power Engineering > Steam boiler > Run > Combustion and adjustments
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