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| 1 | Development and technical progress in large-scale circulating fluidized bed boiler in China显示文摘Circulating fluidized bed(CFB)boilers has realized the clean and efficient utilization of inferior coal like gangue and coal slime,high sulfur coal,anthracite,petroleum coke,oil shale and other resources.As a country with the largest amount of CFB boilers and the largest installed capacity in the world,China has 440100-600 MWe CFB boilers with a total capacity of 82.29 GWe,including 227 units of 135 MWe,95 units of300 MWe,and 24 supercritical units.The statistics of typical 100-300 MWe CFB boilers showed that the average number of unplanned shut-down was only 0.37 times per year,among which the 135 MWe was 0.26 times per year and 300 MWe was 0.46 times per ycai*.The auxiliary power ratio of some 300 MWe CFB boilers based on flow-pattern reconstruction can be reduced to about 4%,which is closed to the same level of pulverized coal(PC)boilers.This paper summarizes the development process and application status of China's large-scale CFB boilers,analyzes the characteristics and technical performance of the iconic units,and introduces solutions to the problems such as water wall wear and bottom ash cooling. | Zhong HUANG Lei DENG Defu CHE | 2020 | Frontiers in Energy2020，14，4： | 4 |
| 2 | Engineering practice and economic analysis of ozone oxidation wet denitrification technology显示文摘SO_(2)and NO emitted from coal-fired power plants have caused serious air pollution in China.In this study,a test system for NO oxidation using O_(3)is established.The basic characteristics of NO oxidation and products forms are studied.A separate test system for the combined removal of SO_(2)and NO_(x)is also established,and the absorption characteristics of NO_(x)are studied.The characteristics of NO oxidation and NO_(x)absorption were verified in a 35 t·h^(-1)industrial boiler wet combined desulfurization and denitrification project.The operating economy of ozone oxidation wet denitrification technology is analyzed.The results show that O_(3)has a high rate and strong selectivity for NO oxidation.When O_(3)is insufficient,the primary oxidation product is NO_(2).When O_(3)is present in excess,NO_(2)continues to get oxidized to N_(2)O_(5)or NO_(3).The removal efficiency of NO_(2)in alkaline absorption system is low(only about 15%).NOx removal efficiency can be improved by oxidizing NO_(x)to N_(2)O_(5)or NO_(3)by increasing ozone ratio.When the molar ratio of O_(3)/NO is 1.77,the NOx removal efficiency reaches 90.3%,while the operating cost of removing NO_(x)per kilogram is 6.06 USD(NO_(2)). | Yang Li Defu Che Chenglong Yang Mingyu Yao Tingwen Zhao Kangli Fu Hanchen Zhao | 2021 | Chinese Journal of Chemical Engineering2021，34，1： | 3 |
| 3 | Experimental and Numerical Study on Co-combustion Behaviors and NO_(x) Emission Characteristics of Semi-coke and Coal in a Tangentially Fired Utility Boiler显示文摘The utilization of powdery semi-coke as a power fuel in pulverized coal-fired power plants has become a new and potential technique to consume the excess powdery semi-coke.The characteristic of low volatile results in poor combustion performance and high NO_(x) emission,and to co-fire with bituminous coal is a practical strategy to address this problem.However,the co-combustion characteristics and the inherent interaction between semi-coke and coal remain insufficiently understood.In addition,the influences of secondary air arrangement,the boiler operation load,and the fuel type on co-combustion process are still unclear,which is urgent to be further explored.In the present study,experiments and numerical simulations were jointly utilized to inquire into the co-combustion behaviors and NO_(x) emission features of semi-coke and coal.The results demonstrated that the'out-furnace method'was a suitable choice for small-capacity boiler when the proportion of semi-coke was 33%,due to the limited combinations of the semi-coke injection position.It was recommended that semi-coke was preferred to be injected from the middle layers of the furnace under the'in-furnace method'to improve the overall co-combustion performance.The critical value of the separated over fire air ratio in this study was 27.5%,over which a slight drop of carbon content in fly ash could come about.Moreover,the elevation in the proportion of separated over fire air gave rise to the significant decline of NO_(x) concentration.The constricted secondary air arrangement was preferred to be employed due to the high boiler efficiency.The separated over fire air and the surrounding air needed to maintain a wide-open degree to prevent the increase of NO_(x) emissions and the coking of nozzles.For the load reduction regulation method adopted in this study,the NO_(x) concentration first rose and then dropped,while the burnout ratio decreased obviously as the operation load was reduced.Different combinations of coal and semi-coke generated significant influences on co-combustion behaviors within the furnace.The NO_(x )generated by high-volatile fuel (bituminous coal) combustion was mainly affected by volatile-N,while the NO_(x )generated by low-volatile fuel (semi-coke) was mainly impacted by char-N.This study is of guiding significance for the efficient and clean utilization and beneficial to the large-scale application of powder semi-coke in power plants. | WANG Chang’an FENG Qinqin JIN Liyan WANG Zhichao YAO Wei WANGPengqian DU Yongbo ZHANG Xilai YANG Zhongcan CHE Defu | 2021 | Journal of Thermal Science2021，30，4： | 2 |
| 4 | A combined power cycle utilizing low - temperature waste heat and LNG cold energy 显示文摘 | SHI Xiaojun CHE Defu | 2009 | Energy Conversion and Manage2009，，50： | 1 |
| 5 | Investigation on the NO reduction with coal char and high concentration CO during oxy-fuel combustion 显示文摘 | Wang Chang'an Du Yongbo Che Defu | 2012 | Energy & Fuels2012，26，12： | 1 |
| 6 | CFD Simulations of Hydrodynamic Characterstics in a Gas - Liquid Vertical Upward Slug Flow 显示文摘 | Donghon G Zheng Xiaohe Defu Che | 2007 | International journal of heat and mass transfer2007，50，21： | 1 |
| 7 | Investigation on the NO reduction with coal char and high concentration CO during oxy-fuel combustion显示文摘 | WANG Chang'an DU Yongbo CHE Defu | 2012 | Energy & Fuels2012，26，12： | 1 |
| 8 | Catalytic reduction of SO2 during combustion of typical Chinese coals显示文摘 | Liu Yanhua Che Defu Xu Tongmo | 2002 | Fuel Processing Technology2002，79，2： | 1 |
| 9 | An Investigation of the Performance of Compact Heat Exchanger for Latent Heat Recovery From Exhaust Flue gases显示文摘 | SHI Xiaojun CHE Defu BRIAN agnew | 2011 | international journal of heat and mass transfer2011，54，： | 1 |
| 10 | A combined power cycle utilizing low-temperature waste heat and LNG cold energy 显示文摘 | Xiaojun Shi Defu Che | 2009 | Energy conversion and management2009，50，3： | 1 |
| 11 | An investigation of the performance of compact heat exchanger for latent heat recovery from exhaust flue gases 显示文摘 | Xiaojun Shi Defu Che Brian Agnew | 2011 | International Journal of Heat and Mass Transfer2011，，54： | 1 |
| 12 | Reactivities of Coals and Synthetic Model Coal under Oxy-fuel Condi- tions 显示文摘 | WANG Chang'an DU Yongbo CHE Defu | 2013 | Thermochimiea Acta2013，553，： | 1 |
| 13 | Pyrolysis and combustion characteristics of coals in oxyfuel combustion显示文摘 | Chang’an Wang Xiaoming Zhang Yinhe Liu Defu Che | 2012 | Applied Energy2012，，： | 1 |
| 14 | An investigation of the performance of compact heat exchanger for latent heat recovery from exhaust flue gases显示文摘 | Shi Xiaojun Che Defu Agnew Brian Gao Jianmin | | 0，，： | 1 |
| 15 | Effect of the cooling and reheating during coal pyrolysis on the conversion from char-N to NO/N2O显示文摘 | Jia Qiong Che Defu Liu Yinhe | 2009 | Fuel Processing Technology2009，90，： | 1 |
| 16 | An investigation of theperformance of compact heat exchanger for latent heat recovery fromexhaust flue gases显示文摘 | Xiaojun Shi Defu Che Brian Agnew | 2011 | International Journal of Heat and Mass Transfer2011，54，： | 1 |
| 17 | Evaluation of retrofitting a conventional natural gas fired boiler into a condensing boiler 显示文摘 | Defu Che Yanhua Liu Chunyang Gao | 2004 | Energy Conversion and Management2004，45，： | 1 |
| 18 | An investigation of the performance of compact heat exchanger for latent heat recovery from exhaust flue gases 显示文摘 | Shi Xiaojun Che Defu Brian Agnew | 2011 | International Journal of Heat and Mass Transfer2011，54，1： | 1 |
| 19 | Evaluation of retrofitting aconventional natural gas fired boiler into a condensing boiler 显示文摘 | CHE Defu LIU Yanhua GAO Chunyang | 2004 | Energy conversion and management2004，45，20： | 1 |
| 20 | Catalytic combustion of ventilation air methane in a reverse-flow reactor 显示文摘 | Wang Yikun Man Chengbo Che Defu | 2010 | Energy Fuels2010，24，9： | 1 |
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