【Ten Years of Rapid Development in Chemical Engineering Equipment】From 1969 to 2022, Dongguo signed the world’s first contract for integrated equipment for the pyrolysis, combustion, and staged conversion of low-grade coal using fluidized bed technology
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Witness the decade-long rapid development of chemical processing equipment; praise the prosperity and strength of modern China. Replies will be rewarded; discussions are welcome------------------------------------------- Recently, Dongfang Boiler has achieved another success in expanding its market for circulating fluidized bed boilers. The company successfully signed a contract for an integrated project involving 8×795t/h subcritical reheated CFB boilers coupled with cogeneration systems, to be used at Shanshan’s silicon-based new materials production facility owned by Shengshi Silicon Industry – this project involves equipment for the integrated pyrolysis, combustion, and staged conversion of low-grade coal. Using coal from Shalihu in Xinjiang as fuel, this project is the world’s first cogeneration facility that employs CFB coupled with pyrolytic combustion and staged conversion technology for burning high-alkali, high-chlorine coal. Its integrated equipment combines a CFB boiler with a pyrolysis unit, enabling the simultaneous production of heat, electricity, gas, and tar within a single system. This approach improves the efficiency of coal utilization, as well as environmental benefits and economic viability, thereby facilitating clean and efficient development across various fields and disciplines in traditional industrial sectors. At the beginning of the project, Dongfang Boiler assembled a team of highly skilled professionals to tackle the challenges. It worked closely with the project owner, Zhejiang University, and design institutes, and conducted research on the issues of corrosion and fouling of the heating surfaces caused by the use of high-alkali, high-chlorine coal from Xinjiang. Ultimately, through the use of air flues combined with water-cooled tube banks, it succeeded in overcoming key technical difficulties related to the integrated thermal system and overall layout of the CFB coupled pyrolysis furnace for multi-product production. The innovative design of this project ensures the stable operation of the equipment under various conditions, such as during the commissioning and shutdown of the pyrolysis unit. It demonstrates East Boiler’s strong technical capabilities and extensive experience in fluidized bed boiler design, thereby earning the trust of customers and leading to the signing of the project contract – opening a new chapter for further cooperation between the two parties. The Shanshan project in Xinjiang represents another significant breakthrough by Dongfang Boiler in the field of CFB coupled cogeneration upgrades. It further expands the company’s range of new products, while also opening up new application possibilities for high-alkali, high-chlorine low-grade coal in Xinjiang. The implementation of this project holds significant strategic and exemplary importance for the clean and efficient utilization of low-grade coal; it will make a substantial contribution to China’s energy security as well as to energy conservation and emission reduction.
The coal reserves in Xinjiang region of our country account for nearly 40% of the country’s total estimated coal reserves. Among these, the Shalihu coal, as one of the typical coal types from Xinjiang, has reserves of around 100 billion tons. This coal features low ash and sulfur content as well as excellent ignition properties; however, its chlorine content can exceed 1%. Such a high chlorine level leads to serious problems related to coking, fouling, and corrosion in applications such as efficient coal-fired power generation and modern coal chemical processing, thereby hindering the safe, efficient, and clean utilization of Shalihu coal. Against this technical background, a review of the research progress and current application technologies of high-chlorine coal at home and abroad is presented, mainly including: 1) the fuel properties, distribution characteristics, and current utilization technologies of high-chlorine coal worldwide and in China ； 2) The existence forms of chlorine in coal, including inorganic forms (discrete chlorides formed by combination with mineral elements, chlorinated complex minerals, and ion forms present in pore water) and organic forms (weakly bound adsorbed forms, strongly bound covalent forms) ； 3) Factors affecting chlorine release during combustion and pyrolysis, as well as the migration patterns and characteristics of chlorine ； 4) Chlorine-induced fouling and corrosion mechanisms on heat transfer surfaces during the combustion of high-chlorine coal ； 5) Coupling mechanism of dioxins and heavy metals such as mercury with chlorine during combustion ； 6) Chlorine control technologies, including pre-furnace, in-furnace, and post-furnace control technologies. Based on literature review and analytical research, suggestions are put forward for the key areas of basic research and technological development in the field of high-chlorine coal in the future.
【Ten Years of Great Development in Chemical Processing Equipment】Ongoing updates to the summary post; feel free to join the discussion: https://bbs.hcbbs.com/thread-3576046-1-1.html (Source: Haichuan Network – Chemical Industry Trends)