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This post was last edited by 654262293 on 2019-11-28 at 07:39. I am an internationally leading expert in low-rank coal rotary pyrolysis technology / Source: Sinochem New Network / Date: 2019-11-27 / Views: 25. Shennu Tianyuan and Hualu Engineering collaborate to explore new ways for the clean utilization of coal. On November 26, the large-scale industrial project for the development and application of low-rank coal rotary pyrolysis technology, developed through a partnership between Shaanxi Coal Group’s Shennu Tianyuan Chemical Co., Ltd. and Hualu Engineering Technology Co., Ltd., passed the evaluation of scientific and technological achievements organized by the China Petroleum and Chemical Industry Federation in Beijing. The appraisal committee, composed of 9 experts including Xie Kechang, Yang Qiyeh, and Ni Weidou, who are academicians of the Chinese Academy of Engineering, as well as Li Hongzhong, an academician of the Chinese Academy of Sciences, unanimously agreed that this technology has resolved the key technical challenges and equipment requirements for the clean, efficient, and selective conversion of pulverized coal in the field of low-temperature coal pyrolysis. The overall technology reaches an internationally leading level, and it holds positive significance for promoting the efficient conversion of lower-grade pulverized coal as well as advancing scientific and technological progress in coal pyrolysis; therefore, large-scale industrial demonstrations on a million-ton scale should be carried out as soon as possible to facilitate its widespread application. The test results showed that the coal tar produced by the 600,000 tons per year industrial demonstration plant built using this technology had a moisture content of less than 0.5%, with a yield of over 10%; the calorific value of the gas was above 7200 kcal/Nm3, the methane content was 40%, and the proportion of useful components was over 85%. The upgraded coke powder had an average total moisture content of 10%, volatile matter content of 10%, fixed carbon content of 82%, and a sulfur content of 0.25%. Zhou Zhuye, vice president of the Petrochemical Federation, said that in recent years China has made continuous breakthroughs in modern coal chemical technology, which has opened up new avenues for the clean and efficient utilization of low-grade coal powder. It is necessary to accelerate the transformation and application of these achievements, and to leverage the role of demonstration projects as catalysts for progress. The low-grade coal powder rotary pyrolysis technology, developed over 8 years of research and development by Shenmu Tianyuan and Hualu Engineering, features strong adaptability to raw materials; it is suitable for high-volatility coal types such as pulverized lignite, long-flame coal, weakly caking coal, and non-caking coal with particle sizes ranging from 0 to 30 millimeters. New technologies such as rotary drying and low-temperature pyrolysis in rotary reactors are employed, and through innovative process combinations, a low-grade coal powder rotary pyrolysis process along with corresponding complete sets of equipment have been created. Among them, the rotary reactor is the core equipment and is easy to scale up; the high-efficiency oil and gas dust removal and recovery system employs a multi-stage dust removal process, which yields good results and is innovative in nature. At the same time, this device consumes little water, making it suitable for use in areas with abundant low-grade coal resources but limited water supplies. According to Mao Shiqiang, chairman of Shenmu Tianyuan Chemical Company, the company adopted this technology in 2013 to build a pilot plant with an annual capacity of 50,000 tons in Jinjie, Shenmu, Shaanxi; in 2016, it began work on the design of a large-scale industrial demonstration plant for the rotary pyrolysis of low-grade coal dust, with an annual capacity of 600,000 tons. The plant was completed by the end of 2018, and it produces products such as high-quality coke dust, coal tar, gas, as well as LNG and LPG. After being subjected to pyrolysis, the quality of the coke dust meets the standards of anthracite. In May 2019, the plant successfully carried out its first trial run, enabling the production of qualified products. To date, the device has operated continuously at full load and safely for 2,952 hours, with process and product parameters exceeding the design values. During the research, development, and industrialization of this project, a series of challenges were overcome, including equipment scaling, pipeline blockages, high levels of oil and gas dust, short operation cycles, equipment coking, oil-water separation, and wastewater treatment. In total, **56 patents were obtained, of which 12 were invention patents. It is reported that, building on the successful operation of the 600,000 tons per year industrial facility, Shenmu Tianyuan is currently advancing the second-phase project, a demonstration project for the clean and selective utilization of 6.6 million tons per year of coal ash resources. The clean, efficient, and selective conversion and utilization of low-grade coal dust is a major challenge. This technological achievement overcomes the technical challenges associated with the efficient utilization of coal powder, and explores a new approach for the efficient and selective conversion of low-grade coal powder, offering significant advantages in terms of comprehensive resource utilization and economic benefits. Low-rank coal accounts for more than half of China’s total coal resources, and is mainly found in regions such as Shaanxi, Ningxia, Inner Mongolia, and Xinjiang. Pyrolytic upgrading is the best method for the clean and differentiated utilization of low-grade coal. However, in the process of mechanized comprehensive coal mining, lump coal accounts for only 20% of the total coal mined, with the vast majority being pulverized coal. Coal pyrolysis technologies mainly include lump coal pyrolysis and pulverized coal pyrolysis. Existing pyrolysis processes focus primarily on lump coal (with coal particle sizes of 30–80 millimeters); they are unable to process pulverized coal, and the yield of coal tar is relatively low. In recent years, breakthroughs have been made in the technology of coal powder pyrolysis, but there are few large-scale industrial plants, and it is difficult to achieve stable operation on a large scale in a continuous manner. At the same time, the high-temperature on-line separation of pyrolyzed coal coke and oil gases is one of the main technical challenges; this results in poor quality of coal tar, which does not meet the requirements for further processing, and thus becomes a bottleneck preventing the industrial application of coal pyrolysis.