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Author/Source: China Chemical Industry News Date: 2009-4-3 ------------------------------------------------------------------------------- In addition to power generation, coal can also be used to produce liquid fuels and chemicals on a large scale, and integrated gasification combined cycle (IGCC) polygeneration can perfectly combine these two aspects. With the development of various key technologies of IGCC and the successful operation of demonstration devices, the conditions for the development of IGCC polygeneration in my country have begun to mature. At the 2009 China IGCC Polygeneration Summit Forum held last week, the “Eleventh Five-Year Plan”” * * “863" project - the overall expert group leader of the major polygeneration demonstration project based on coal gasification, Xiao Yunhan, deputy director of the High Technology Research and Development Bureau of the Chinese Academy of Sciences, and academicians of the Chinese Academy of Engineering such as Ni Weidou and Weng Shilie, unanimously stated that as an important solution to comprehensively solve my country's energy problems, IGCC polygeneration must make full technical preparations, organize joint research on key technologies, and further clarify the coal gasification cogeneration technology roadmap. Promoting the development of IGCC through polygeneration According to Xiao Yunhan, my country's medium- and long-term science and technology development plan outline has clearly stated that it is necessary to focus on the research and development of coal-based polygeneration system technology based on coal gasification. In 2008, the Chinese Academy of Sciences and McKinsey & Company jointly completed the “China-US Cooperation: In the research report "Changing the Energy Pattern", IGCC+ carbon capture and storage (CCS) technology is listed as the top priority area. IGCC polygeneration transportation fuel (new coal chemical products and materials) is an emerging comprehensive utilization technology of coal. It breaks through the limitations of a single industry and greatly improves energy efficiency, reduces costs and reduces emissions through the integration of material conversion and energy conversion. On the one hand, polygeneration can improve the peak shaving capacity, economy and efficiency of IGCC. On the other hand, IGCC can also enhance the energy efficiency, availability and economy of fuel/chemical production. Academician Ni Weidou believes that IGCC is an ultra-clean and efficient power generation technology, but its investment cost is high, it cannot compete with conventional coal-fired power stations economically, its operation is not flexible enough, and it can generally only be used as a base-load power station. The polygeneration system based on coal gasification couples IGCC and coal chemical technology to achieve overall optimization of energy flow and material flow, while eliminating conventional coal-burning pollutant emissions, removing heavy metals more economically, and solving coal-burning pollution problems. Therefore, polygeneration is an important way to promote the development of IGCC. Joint breakthroughs in key technologies IGCC investment is huge and is still in the commercial demonstration period. Our country has not yet fully mastered some key core technologies. Academician Weng Shilie believes that full technical preparation must be made to develop IGCC polygeneration! He said that it is necessary to promote the strong combination of coal gasification engineering and thermal electrical engineering, build an IGCC power generation system in a relatively mature coal chemical polygeneration system, and follow a unique coal-based polygeneration IGCC technology route. Coal gasification polygeneration requires breakthroughs from high-tech groups, which requires joint research from electric power, coal chemical industry, comprehensive energy enterprises, technology providers, engineering design, equipment manufacturing, etc. * * , enterprises, research institutes and universities work closely together. In this regard, Academician Weng Shilie pointed out that IGCC in IGCC polygeneration must make breakthroughs in five aspects, namely clean and efficient combustion technology of medium and low calorific value syngas, carbon dioxide capture and solidification technology, balanced operation of various components of the gas turbine (including flow balance, power balance), control strategy of the entire large system and the applicability of existing coal-based syngas and other key technical issues. Among them, the gas turbine is the main bottleneck in realizing the IGCC system. Our country has not yet mastered the key design technology and should focus on research. Academician Ni Weidou said that gas turbines are the core technology of polygeneration systems. The main problem with gas turbines currently used in polygeneration is that gas turbines originally using natural gas are not suitable for burning low calorific value synthesis gas with complex components. The development of gas turbines that can adapt to different fuel components should be a breakthrough direction. Clarify the coal gasification co-generation road map According to Xiao Yunhan, my country has formulated the overall goal of the development of the co-generation system by 2020, as well as the stage goals for the development of key unit technologies and system integration technologies of co-generation and the development goal of near-zero emissions. In order to achieve the above goals, our country has clarified the development ideas of coal gasification cogeneration technology based on actual projects, engineering development and deepening of key technologies, and achieving industrial verification, integration and application of key technologies. “During the 11th Five-Year Plan period, my country will implement five combinations - combining independent research and development with introduction and digestion, combining technological progress with demonstration projects, combining recent needs with long-term development, * * Advocacy should be combined with industry-university-research efforts, industry coordination and policy encouragement to promote the rational development of IGCC and polyproduction. At present, the converted power supply efficiency of the Yankuang coal gasification power generation and methanol cogeneration system industrial demonstration device, the first IGCC polygeneration demonstration project in China, has reached 39.5%. * * 29% higher power generation efficiency than conventional thermal power ； At the same time, nearly 20% of the methanol purge gas is mixed into the fuel gas of the gas turbine, and the carbon dioxide emissions per unit of power generation are reduced by nearly 30%. Now, Yankuang is conducting joint tests of 300,000 tons/year methanol, 600,000 tons/year acetic acid and 80,000 kilowatt IGCC power generation projects on the basis of 80,000 kilowatts IGCC power generation and 240,000 tons/year methanol co-production. According to reports, during the "11th Five-Year Plan" period, my country will also build IGCC/co-production demonstration projects such as the Zhejiang Hangzhou Huadian Banshan IGCC Demonstration Project, the Dongguan Electrochemical IGCC Demonstration Project, the Shaanxi Yulin Yankuang Oil and Power Co-production Demonstration Project integrated with million-ton synthetic oil, and the Shanxi Lu'an Oil and Power Co-production Demonstration Project.