Key Technologies for the Resource Utilization of Typical Industrial Waste Gases in Sichuan Tianren Chemical Engineering Awarded

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Key Technology for the Utilization of Typical Industrial Waste Gases Developed by Sichuan Tianren Chemical Engineering Wins Award; Author/Source: Sinochem News Network; Date: March 28, 2022; Clicks: 6. Reporters learned from Sichuan Tianren Chemical Engineering Co., Ltd. on March 18 that the key technology it developed for the utilization of typical industrial waste gases won the first prize in the 2021 China Non-ferrous Metals Industry Science and Technology Award. The expert panel for evaluating the achievements of the project, led by Chai Liyuan, an academician of the Chinese Academy of Engineering, believes that this achievement has innovated the technology for the resource utilization of industrial waste gases, providing technical support for clean production in the metallurgy and chemical industries. This technology can comprehensively recover useful components such as hydrogen, carbon monoxide, and nitrogen from carbon-containing industrial waste gases, thereby significantly reducing the amount of toxic and harmful gases as well as carbon emissions. The combined deep purification of multiple components in its carbon-containing industrial waste gases achieves a level of 10 ppb; the temperature required for the purification reaction is 100°C lower than that in traditional processes, resulting in advanced technical and economic parameters. After waste gas purification, the quality of the ammonia-alcohol co-production product meets **the relevant standards**. The overall technology of this project is at the international leading level; it is recommended to accelerate its promotion and application. This technology was developed jointly by Sichuan Tianren Energy Technology Co., Ltd., a subsidiary of Tianren Chemical, together with Kunming University of Science and Technology, China University of Petroleum (East China), Hunan Anchun High-Tech Co., Ltd., and other organizations. To address issues such as the complex composition of carbon-containing industrial waste gases and the difficulty in removing impurities, the project team spent 15 years on research efforts, overcoming the key technical challenges related to the pre-combustion capture and resource utilization of such waste gases. They also broke through the technical barriers associated with the resource utilization of industrial waste gases containing carbon monoxide. According to Yang Hao, chairman of Tianren Energy Company, typical carbon-containing industrial exhaust gases have complex compositions, with many components that can be utilized as resources; however, the variation in these components is significant, making it difficult to utilize them effectively. The chemical industry emits hundreds of billions of standard cubic meters of waste gas each year, and most of this gas, aside from coke oven gas, is simply burned away, resulting in a low rate of resource utilization. If the recycling rate of carbon-containing industrial waste gases reaches 30%, tens of millions of tons of standard coal can be saved each year, along with tens of millions of tons of CO2 emissions reduced. To address the aforementioned issues, the project pioneered a conjugate catalytic removal technique for sulfur, phosphorus, arsenic, and cyanide prior to the combustion of typical carbon-containing industrial waste gases. It developed manganese-molybdenum modified catalysts for dewetting, dephosphorization, dearsenification, and desulfurization processes, achieving simultaneous removal through hydrogenolysis and hydrolysis of organic sulfur compounds. To address issues such as severe difficulty in controlling reactions for hydrogen production via the reforming of industrial waste gas containing high concentrations of carbon monoxide, methanol synthesis, and ammonia synthesis, low utilization efficiency of feed gas, and catalyst deactivation caused by excessively high local temperatures, the project team has developed a set of technologies and equipment including radial-bed isothermal reforming for carbon monoxide, short-process reforming, and low-pressure isothermal methanol synthesis. To address issues such as high costs and low utilization efficiency in the recycling of single types of industrial waste gases, the project team has also developed a variety of key technologies for the comprehensive recycling of all components in industrial waste gases. By adapting these components to replace the need for additional industrial gas components, it is possible to achieve the comprehensive recycling of various carbon-containing industrial waste gases. This achievement has been applied in industries such as calcium carbide, carbon black, metallurgy, and coking, enabling the utilization of chemical products derived from waste gases such as blast furnace gas, electric arc furnace gas, calcium carbide furnace gas, and yellow phosphorus exhaust gas. A total of 16 billion cubic meters of such waste gas have been treated, resulting in a reduction of over 30 million tons of carbon dioxide emissions. This has improved the level of clean production in these industries and led to a reduction in emissions at the source in multiple sectors. This technical equipment has been industrialized and deployed in over 20 enterprises; it features good reproducibility, and brings significant economic, social, and environmental benefits.