The core equipment of the Xiangyu Salt Chemical Gasification Energy-Saving Technology Upgrade Project, namely the gasifier, was successfully lifted into place

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The gasifier, the key equipment for the energy-saving technology upgrade project for coal gasification at Xiangyu Salt Chemical, was successfully lifted. Author/Source: Xiangyu Salt Chemical. Date: May 11, 2022. Clicks: 9. At 12:08 p.m. on May 10, 2022, the gasifier, the core equipment of the energy-saving technology upgrade project for coal gasification at Xiangyu Salt Chemical, was successfully lifted. The energy-saving upgrade project for coal gasification utilizes the Si Jinhua Furnace 3.0. Through bold innovation, and by drawing on the principles of natural circulation for intrinsic safety in the field of thermal engineering as well as the principle of slag protection using water-cooled walls, this technology employs a water-cooled wall fluidized-bed coal gasification method that successfully addresses the issues related to the ignition, stable combustion, and efficiency of water-coal slurry. It boasts advantages such as good stability, strong adaptability to different coal types, high system operation efficiency, strong safety, fast startup, and high energy utilization efficiency. The gasifier is the core equipment in coal gasification plants; it weighs approximately 413 tons, with dimensions of φ3800X27412 mm. Its operating pressure reaches 6.5 megapascals, while the operating temperature inside the furnace is 1300°C. Each furnace can produce 40,000 cubic meters of usable gas per hour. The gasification furnace is equipped with water-cooled walls as well as water-cooled walls for the waste boiler; it enables heat recovery while producing syngas, generating high-pressure steam that can be sent to the caustic soda production facility. This approach facilitates the comprehensive utilization of energy consumption, thereby achieving the goals of energy savings and emission reduction. Oxygen and coal slurry undergo a series of redox reactions in the combustion chamber of the gasifier to produce crude syngas. The crude syngas has its heat recovered in an exhaust boiler, after which it enters a quench chamber where it is cooled and dust removed through a water bath. The crude syngas with the appropriate temperature then passes through the outlet pipeline of the quench chamber and enters a gas washing tower for further purification. The residue remaining after the combustion of coal slurry is crushed by a slag breaker located at the bottom of the quench chamber, and then it enters a slag lockhopper for collection and removal. The successful lifting of the gasification furnace marks further progress in the construction of the Xiangyu Salt Chemical Industry Upgrade project, and it also serves as a boost for the successful completion of this project. Chongqing Xiangyu Salt Chemical Co., Ltd. was formerly known as Chongqing Zhihua Chemical Co., Ltd. In December 2018, Hunan Light Industry Salt Industry Group acquired the former Chongqing Zhihua in its entirety; following a share restructuring, it was renamed Chongqing Xiangyu Salt Chemical Co., Ltd. The Xiangyu Salt Chemical Gasification Energy-Saving Technology Upgrade Project is located at plot B10-05/04 in the Longbao Unit V management area of the Chongqing Wanzhou Salt and Gas Chemical Park (an open area to the south of the existing plant of Chongqing Xiangyu Salt Chemical Co., Ltd.). An investment of 1.5 billion yuan will be made to upgrade the existing gasification facilities in this open area to the south of the current plant; the project will utilize two Jinhua furnaces, 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 project was contracted out in its entirety by China Fifth Ring Engineering Co., Ltd. EPCC; new units for coal grinding and slurry preparation, gasification, conversion, low-temperature methanol washing, liquid nitrogen washing, ammonia synthesis, and sulfur recovery were constructed, while an air separation unit was built using the existing plant facilities. As a result of these upgrades, the total annual capacity for ammonia synthesis increased from 200,000 tons to 300,000 tons per year.