The multi-stage hierarchical conversion fluidized bed at the Institute of Coal Chemistry, Chinese Academy of Sciences, has achieved stable operation at 2.8 MPa for the first time and has passed the evaluation

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In response to the needs for the tiered utilization of low-rank coal and coal-to-gas gasification technologies, and with the support of the \"Key Direction Projects of the Chinese Academy of Sciences Knowledge Innovation Program\" and the \"Strategic Priority Research Programs of the Chinese Academy of Sciences\", the Shanxi Institute of Coal Chemistry of the Chinese Academy of Sciences and China National First Heavy Machinery Group Corporation collaborated to develop a multi-stage hierarchical conversion fluidized-bed gasification technology. After years of research, breakthrough progress has been achieved; stable operation of this 2.8 MPa fluidized-bed gasification technology was successfully realized for the first time on a multi-stage bed pilot platform, with all process parameters reaching international advanced levels. On May 13, 2017, the Science and Technology Department of Shanxi Province organized experts to evaluate this achievement. The appraisal committee is composed of seven renowned experts in the field of coal chemical engineering in China, including Professor Yu Guangsuo from the Institute of Clean Coal Technology at East China University of Science and Technology, Professor-level senior engineer Song Qiyue from Taiyuan Gasification Group Company, Professor Guo Zhi from the Beijing Institute of Low-Carbon Clean Energy of Shenhua Group, Professor-level senior engineer Xiao Xiaoyu from China Wuhuan Engineering Co., Ltd., Professor Zhang Yongfa from Taiyuan University of Technology, Professor-level senior engineer Dong Yue from the Coal Chemical Industry Branch of Taiyuan Heavy Industry Co., Ltd., and Professor-level senior engineer Liang Jiehua from the National Coal Chemical Engineering Design Center. The meeting was chaired by Li Lei from the Achievements Division of the Shanxi Provincial Department of Science and Technology. Fang Yitian, deputy director of the Shanxi Coal Chemistry Institute, Zhao Xiaohong, director of the special project office, Jiang Dong, head of the science and technology development department, and members of the project team attended the meeting. Researcher Fang Yitian, the project leader, gave a presentation on the project, covering the key technologies involved, innovative aspects, pilot-scale application (with a bottom diameter of 800 mm, an upper diameter of 400 mm, and a total height of 30 meters), as well as the prospects for further dissemination. A video clip of the \"pilot-scale demonstration unit\" was also shown. After listening to the presentation and reviewing the relevant materials, the experts on the evaluation committee, through questioning and discussion, unanimously agreed that this project integrates the advantages of gray pyrolysis gasification, pressurized hydrogenation pyrolysis, transport bed gasification, and pressurized fluidized bed gasification technologies, enabling the efficient gasification of coals and coke with a wide range of particle sizes ； It combines pressurized high-temperature gasification with pyrolysis to produce syngas with a high methane content ； It is capable of gasifying coke powder (pyrolyzed semi-coke) on a large scale; oxygen/steam is introduced in stages through the lifting section, and advanced automatic control technology for high-temperature fine powder circulation is employed to improve the gasification efficiency of these fine powders, thereby significantly increasing the carbon conversion rate in the fluidized bed gasification process. The research results of this project are technologically advanced, scientifically sound, safe and reliable, and innovative; they have broad prospects for application and promotion, with a research level that is on par with the international advanced technologies in this field. It is also recommended to conduct further research, optimize the process flow, and accelerate the promotion of industrial application. Significance: 1. The methane content in the syngas is 5%-8%, with no tar production ； 2. It is excellent news for the conversion of low-grade coal in our country (the operating temperature of the ash fusion fluidized bed at Yunnan Wenshan Aluminum Industry is around 880 degrees, with a carbon conversion rate of 90%) ； 3. It provided a boost to overcoming the global challenge of high-pressure operation in fluidized-bed gasification technology ； 4. It established China’s leading position in fluidized-bed gasification technology on the international stage (the current mainstream gasification technology is large-scale fluidized-bed gasification; it has been quite difficult to persist in developing fluidized-bed gasification technology over several decades – dedication and perseverance are required). Congratulations to the Shanxi Coal Chemistry Research Institute of the Chinese Academy of Sciences for its breakthroughs in the field of fluidized beds; kudos to them for their years of persistent efforts! ! !