Abstract
Pressurized oxy-fuel combustion technology is the second generation of oxy-fuel combustion technology and has low energy consumption and low cost. In this research, a visual pressurized flat-flame reaction system was designed. A particle-tracking image pyrometer (PTIP) system based on a high-speed camera and an SLR camera was proposed. Combining the experimental system and data-processing method developed, the ignition and combustion characteristics of a single coal particle between 69 and 133 μm in size were investigated. The results indicated that at atmospheric pressure, the ignition delay time of ShanXi (SX) anthracite coal was longer than that of ShenHua (SH) bituminous coal, while that of PRB sub-bituminous coal was the shortest. As the pressure rose, the ignition delay time of the PRB sub-bituminous coal and SX anthracite coal showed a continuous increasing trend, while the ignition delay time of SH bituminous coal showed a trend of first increasing and then decreasing. Moreover, pressure also affects the pyrolysis process of coal. As the pressure increases, it became more difficult to release the volatiles produced by coal pyrolysis, which reduced the release rate of volatiles during the ignition stage, and prolonged the release time and burning duration time of volatiles.
Highlights
According to the 2020 China Statistical Annual [1], coal combustion still occupies a crucial position in China’s energy generation system, and coal combustion is the main source of greenhouse gas emissions around the world
The first is homogeneous ignition: ignition occurs in a gas-phase reaction
When the pulverized coal is heated to a certain temperature, it begins to pyrolyze and releases volatile components
Summary
According to the 2020 China Statistical Annual [1], coal combustion still occupies a crucial position in China’s energy generation system, and coal combustion is the main source of greenhouse gas emissions around the world. Oxyfuel combustion technology uses high-purity oxygen instead of combustion air based on the existing power plant boilers and flue gas circulation technology to obtain highconcentration carbon dioxide flue gas, which can condense and compress enriched carbon dioxide for permanent storage. Due to its ease of implementation and ability to achieve a better economic efficiency, this currently seems to be the most promising combustion technology for reducing CO2 emissions effectively. Zheng et al [4,5] stated that the pressurization process can effectively reduce energy loss, improve combustion heat efficiency, and cut down CO2 emissions
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