Commencement of the gasification energy-saving technology upgrade project at Chongqing Xiangyu Salt Chemical Co., Ltd

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Commencement ceremony of the energy-saving technology upgrading project for gasification at Chongqing Xiangyu Salt Chemical Co., Ltd. / Source: Gasification Industry News Date: June 7, 2021 Page views: 5 On the morning of June 5, the commencement ceremony for the energy-saving technology upgrading project for gasification at Chongqing Xiangyu Salt Chemical Co., Ltd., which is being undertaken by China Wuhuan Engineering Co., Ltd. as the EPCC contractor, was held grandly in Wanzhou, Chongqing. Attending the event were Pu Chengming, Deputy Secretary of the Party Leadership Group of Wanzhou District and Deputy Secretary of the Party Working Committee and Director of the Management Committee of Wanzhou Economic Development Zone; Yan Sen, Deputy District Head of Wanzhou; heads and representatives from relevant departments of Wanzhou District and Wanzhou Economic Development Zone; as well as over 200 representatives from Hunan Light Industry & Salt Industry Group Co., Ltd., China Wuhuan Engineering Co., Ltd., China Chemical Engineering No. 16 Construction Co., Ltd., Zhongji Construction and Survey Group Co., Ltd., Hunan Textile and Light Industry Design Institute Co., Ltd., and Chongqing Xiangyu Salt Chemical Co., Ltd. The Chongqing Xiangyu Salt Chemical Gasification Energy-Saving Upgrade Project is located in the Salt Chemical Industrial Park in Wanzhou District, Chongqing. The construction scale includes a 300,000-ton/year ammonia synthesis plant, an air separation unit, a gasification unit, a purification unit, along with associated utility systems and auxiliary facilities. The completion of this project represents an innovation in the energy-saving process technologies for existing ammonia synthesis plants; by reducing energy consumption, it plays a significant role in effectively controlling the overall environmental emissions in the Three Gorges Reservoir area. China Five Rings Engineering Co., Ltd. took charge of the general contracting for the energy-saving technology upgrade project of Chongqing Xiangyu Salt and Chemical Gasification under the EPCC model. On the morning of March 1, the signing ceremony and kick-off meeting for this project were held. The value of the winning contract is approximately 1.056 billion yuan. Project Overview: The gasification energy-saving technology upgrade project of Chongqing Xiangyu Salt Chemical Co., Ltd. is located at plot B10-05/04 in the Longbao Tuantuan IV management unit of Chongqing Wanzhou Salt and Gas Chemical Park (an open area to the south of the company’s existing factory). With an investment of 1.5 billion yuan, the existing gasification units will be upgraded in this open area to the south of the factory; the project will utilize two Jinhua reactors, with a gasification pressure of 6.5 MPaG and a total gas flow rate of 80,000 Nm3/h (CO+H2), thereby replacing the existing atmospheric-pressure fixed-bed gasification system. The newly acquired land for the project covers an area of 122,000 m2; the existing vacant space within the factory complex is utilized for 15,030 m2, while the land used for buildings and structures amounts to 54,820 m2 ； An additional area will be created on the south side of the existing plant, where new units for coal grinding and slurry preparation, gasification, shift reaction, low-temperature methanol washing, liquid nitrogen washing, ammonia synthesis, and sulfur recovery will be built. An air separation unit will be constructed using the existing plant facilities, and as a result of these upgrades, the total annual production capacity of synthetic ammonia will increase from 200,000 tons to 300,000 tons per year. This project involves technical upgrades to the key machines and equipment that consume the most raw coal and energy, in order to improve their technical performance. High-efficiency catalysts are used, and energy-saving process innovations are applied to existing ammonia synthesis plants to reduce the emission of waste materials, thereby achieving energy savings and reduced consumption. This approach helps to effectively control the overall environmental emissions in the Three Gorges Reservoir area ； This project utilizes advanced international and domestic DCS automation control systems as well as a separate SIS system, which will significantly enhance the level of automation and safety and control, thereby creating favorable conditions for the sustainable development of the enterprise. The project’s technical solution is as follows: for gasification, the advanced 6.5MPa third-generation water-coal slurry pressurized gasification technology developed by Jinhua is utilized; for shift reaction, the most advanced and energy-efficient isothermal sulfur-tolerant shift technology currently available in China is used ； The purification section utilizes the most advanced low-temperature methanol washing and liquid nitrogen washing processes available both domestically and internationally; the energy-intensive pressure swing adsorption process has been eliminated, as has the copper washing process, whose use is restricted. Ammonia synthesis is carried out using patented technology from Casali in Switzerland, with an operating pressure of ≤15.0 MPa. The compressors are all driven by centrifugal steam turbines, which makes the facility safer, more environmentally friendly, and more energy-efficient.