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Fig. 1 Comparison of pollutant emissions Comparison of water vapor and CO2 concentration in flue gas
Fig. 2 Furnace temperature curve in 50%O2/RFG combustion mode
With the rapid development of society and economy and the continuous improvement of the material living standards of humankind, the increasing demand for energy resources and the sustained and harmonious coexistence of energy and the environment have become serious challenges facing the world. How to effectively control the CO2 emissions from the burning of large amounts of fossil fuels has always been a hot topic in the international climate and even affects international relations. Oxygen-enriched combustion technology is one of the three major technologies for CO2 capture technology. Because of its outstanding advantages, circulating fluidized bed oxygen-enriched combustion technology has become a hot topic in the world in recent years.
Under the support of the important directional project of the Chinese Academy of Sciences’ Knowledge Innovation Project, in 2011, the Institute of Engineering Thermophysics of the Chinese Academy of Sciences began research on oxygen-enriched combustion technology for circulating fluidized beds and developed a 100kw circulating fluidized bed oxygen-enriched combustion small-scale experimental device. A series of experimental studies on coal combustion and emission characteristics under O2/N2 conditions were conducted on this experimental device. The device was reconstructed in 2012 and the flue gas recirculation system was added. By adopting the dry flue gas circulation method, the test system has truly reached the requirements of the oxy-combustion technology experimental research platform.
The key technologies of flue gas recirculation were mainly studied on the experimental bench after transformation, including flue gas purification, condensation, and boosting cycles, heating, distribution, and many other technologies. A large amount of experimental data was obtained, which was a MW-class cycle. The design of fluidized-bed oxygen-enriched combustion pilot plant provides reference and basis.
In order to further study the circulating fluidized bed oxygen-enriched combustion technology, relying on the Chinese Academy of Sciences strategic pilot technology coal project "semi-coke / coal clean and efficient combustion technology demonstration" project, engineering thermal physics Langfang research and development center developed a 1MW circulating fluidized bed oxygen-rich Burning pilot plant. The plant started construction in October 2013 and completed all construction and installation tasks in April 2014. It is currently the largest thermal power plant in China with the highest oxygen concentration in the world. It is a circulating fluidized bed oxygen-rich combustion pilot plant with flue gas recirculation. .
A few days ago, hot debugging and related experimental work were carried out on the pilot plant, and the successful completion of the coal and semi-coke in the air and the high concentration of oxygen enriched/recycled flue gas (O2/RFG) two combustion methods Experimental study of combustion characteristics and pollutant emission control. The test results show that the pilot plant can carry out oxygen-enriched flue gas recirculation tests with 21%-50% air and total oxygen concentration. External heat exchangers and adjustable heating surfaces in the furnace can achieve thermal load on the unit and the furnace Adjustment of the temperature, the thermal load of the pilot plant can be adjusted within the range of 0.5-1.2MW, and the concentration of flue gas CO2 reaches 90% in the flue gas recirculated oxygen-enriched combustion test condition in which the overall oxygen concentration is 40%.
Through hot debugging and related tests, the researchers initially mastered the switching operation method of circulating fluidized bed from air combustion to high concentration oxygen recirculation and oxygen-enriched combustion, and the combustion temperature distribution of coal and semi-coke and the working characteristics of external heat exchangers. , pollutant emission characteristics and limestone desulphurization characteristics in the furnace were studied. Through comparative experiments on air and O2/RFG combustion modes, certain experimental data were obtained and used to study the difference between the two combustion modes. Compared with conventional air combustion, the CO2 concentration in the tail gas of the high oxygen concentration flue gas recycle is greatly increased, the combustion efficiency is improved, and the NOX emission is reduced, but the H2O vapor and SO2 are enriched in the flue gas due to the recycle. .
Researchers will continue to conduct research on the high oxygen concentration combustion of circulating fluidized bed in the pilot plant, including combustion characteristics of different fuel O2/RFG, pollutant generation and control, ash generation characteristics, and combustion under high oxygen concentration. The heat transfer and flow studies provide important references and basis for the design of industrial-scale circulating fluidized bed oxygen-enriched combustion boilers.
The relevant research results have been reported at the 12th International Conference on Greenhouse Gas Control Technology sponsored by the International Energy Agency (IEA) and will be published in the recently published Energy Procedia.
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