View:2 Date:2021-12-31
On December 28, 2021, the Chinese Society for Metals organized a scientific and technological achievement evaluation meeting in Beijing on the “Development and Engineering Application of Complete Technology for High-Efficiency, Energy-Saving Vertical Heat-Exchange Coking Ovens with Heat Recovery”. An evaluation committee comprising 13 authoritative industry experts, including Academicians Yin Ruiyu and Mao Xinping of the Chinese Academy of Engineering, Wang Tianyi (Director of the Expert Committee of the Chinese Society for Metals), Professor Zhang Xinxin (former President of the University of Science and Technology Beijing), Huang Dao (Deputy Secretary-General of the China Iron and Steel Association), Cui Pijiang (President of the China Coking Industry Association), and Shi Yanfeng (Secretary-General of the China Coking Industry Association), evaluated the scientific and technological achievement of the project jointly completed by Huatai Yongchuang (Beijing) Technology Co., Ltd., Heilongjiang Jianlong Chemical Co., Ltd., and Shanxi Changxiang Chaogongyi Technology Co., Ltd, and unanimously concluded that this scientific achievement has reached an internationally leading level. The meeting was chaired by Wang Xinjiang, Vice Chairman and Secretary-General of the Chinese Society for Metals. Xu Lie, Chairman of Huatai and other leaders from the participating organizations attended the meeting.
The Evaluation Committee heard a presentation by Huatai Chairman Xu Lie and reviewed the relevant materials. Following a question-and-answer session and discussion, the committee concluded that this scientific and technological achievement has reached an internationally leading level.
This project marks the first development of a coking technology using “high-efficiency, energy-saving vertical heat-exchange coke oven with heat recovery”, which generates no toxic or harmful pollutants, successfully achieving clean, efficient, energy-saving, and low-carbon coke production for industrial application. The key innovations are as below:
(1) We have developed the world’s first complete furnace structure for a high-efficiency, energy-saving vertical heat-recovery coke oven. Building upon the efficient layout of conventional by-product recovery coke ovens and their indirect heating structure between the vertical carbonization chamber and combustion chamber, the team enhanced and innovated the design, pioneering structural features such as a raw gas balancing duct connecting multiple carbonization chambers, adjustable vertical flue cross-holes that allow raw gas from adjacent carbonization chambers to enter the same combustion chamber, multi-stage air-controlled combustion, and a high-efficiency heat exchanger for air preheating. Compared to horizontal heat-recovery coke ovens, this design achieves a 24% reduction in overall footprint, a 10% reduction in construction investment, an approximately 86% reduction in heat loss from the oven surface, and a 2–6% reduction in coke burning loss. It resolves the global challenge of realizing uniform distribution and combustion of raw gas in heat-recovery coke ovens;
(2) The project pioneered the integration of several high-efficiency coking technologies, including multi-dimensional adjustment of heating uniformity in heat-recovery coking ovens, segmented multi-point combustion, continuous heating across all flues, and preheating of feeding air. It also established standard temperature and heating uniformity evaluation and control technologies for new-type coking ovens, as well as comprehensive technical procedures and operational plans covering the entire process from oven drying-out and startup to normal production. We achieved a major breakthrough by reducing the vertical temperature difference in coke cakes to less than 50°C, shortening coking time from 60–70 hours in horizontal furnaces and 22.5 hours in comparable mechanical coking furnaces to 21 hours, and increasing production efficiency by 10.3% compared to similar mechanical coking furnaces. This systematically resolved the major technical challenge of heating uniformity in heat-recovery coking furnaces;
(3) We have pioneered the development of multiple energy-saving and emission-reduction technologies, including air preheating, combustion control of raw gas within the furnace, and low-temperature flue gas reflux to regulate combustion. These innovations have enabled the new coke oven to achieve an energy consumption per ton of coke less than 100 kgce, with comprehensive CO₂ emissions per ton of coke lower than those of existing coke ovens and NOx emissions below 105 mg/cm³ (ultra-low emission). At the same time, these measures help to prevent high-temperature accidents and ensure the long service life of the coke oven. The production process generates no toxic or hazardous pollutants such as phenol-cyanide wastewater, organic waste, organic slag, or BAP, achieving clean coke production.
Introduction to the High-Efficiency, Energy-Saving Vertical Heat-Exchange Coke Oven with Heat Recovery
The results of this project have been successfully implemented at Heilongjiang Jianlong Chemical Co., Ltd., yielding significant economic and social benefits. The project has addressed major industry-wide challenges at their source, including environmental pollution from mechanical coke ovens and the low efficiency, high energy consumption, large land occupation, and high capital investment associated with heat-recovery coke ovens. It has significantly enhanced the industry’s viability and competitiveness, laying the groundwork for the resource utilization of flue gas to achieve near-zero CO₂ emissions.
With the ultimate goal of achieving the highest levels of environmental sustainability and energy efficiency in coke production, this project develops and applies new coking technologies that are cleaner, more efficient, energy-saving, and able to conserve high-quality resources. It holds significant practical importance for the green and sustainable development of China’s coking industry. It has paved the way for the coking industry in China and even across the world to adapt to the future green economic development.
Moving forward, Huatai remains committed to the path of technological innovation and will continue to leverage its strengths in technological innovation, increase investment in science and technology, and vigorously implement an innovation-driven development strategy. The Company will persist in conducting fundamental research to address key common challenges within the industry, facilitating the company’s strategic development.
