Thread Content
This post was last edited by azhong2074 on 2024-2-17 at 14:11. Recently, the \"Waste Heat Recovery Renovation Project for the Flue Gas Before the Dust Collector of Unit #2 at Jineng Changzhi Thermal Power Co., Ltd.,\" which uses fluoroplastic steel low-temperature economizers as key equipment, successfully passed the inspection and acceptance! Jineng Changzhi Thermal Power Co., Ltd. currently has 2 coal-fired boilers with a capacity of 1171 t/h, along with two 330MW steam turbine generators ； The original design called for the use of H-type finned heat exchangers in the flue ahead of the dust collector to recover the waste heat from the flue gas; however, due to issues such as ash accumulation, blockages, and corrosion, leaks occurred in these heat exchangers, affecting the safe and stable operation of the boiler. Therefore, renovation was necessary. Fluoroplastic steel heat exchangers feature advantages such as corrosion resistance, anti-scaling properties, resistance to ash accumulation, good temperature and pressure tolerance, and low resistance. Considering the problems associated with corrosion, leakage, and flue blockage in the heat exchangers at Jineng Changzhi Thermal Power Plant, it was decided, after thorough consideration, to use fluoroplastic steel low- and medium-temperature economizers as the key equipment for this project aimed at recovering waste heat from flue gases. The implementation plan is to remove the H-type finned heat exchangers from the first four flue ducts of the dust collector, and to install fluoroplastic-steel low- and ultra-low temperature economizers in their original positions and at the same dimensions. The heat exchangers are designed in a modular format; for contact with flue gas, they use fluoroplastic-steel heat exchange tubes (made of 2205 material) along with frames made of 2205 duplex stainless steel, thereby achieving corrosion resistance, reduced dust accumulation, and stable operation over extended periods of time. As the company’s first participation in a project related to the recovery of waste heat from low-temperature flue gas in 300,000-kilowatt thermal power units, Quzhou Baiqiang attached great importance to this project. Specialized engineering and technical personnel were assigned to provide guidance throughout the entire process, including equipment installation on site, pipeline pressure testing, insulation work, defect correction, operation training, and trial runs, to ensure the smooth progress of the project. On November 14, 2023, a 168-hour trial run was commenced; during this period, the main equipment operated normally and all performance indicators met the design requirements, earning high recognition from all parties involved. The fluoroplastic steel heat exchanger series has been granted multiple **patents. The low-temperature flue gas deep waste heat recovery technology using fluoroplastic steel was included in the Ministry of Industry and Information Technology’s \"Recommended Catalogue of Energy-Saving Technologies and Equipment in the Industry and Information Technology Sector (2022 Edition)\” in 2022, and it was also listed among the providers of industrial energy-saving and carbon-reduction processes, technologies, equipment, and engineering solutions in Zhejiang Province in 2023.