State Grid Zhejiang Electric Power independently developed a transformer waste heat recovery and utilization system
Writer： Hengfeng you electric Time：2023-04-13 views：times
"The thermoelectric generator has high thermal conductivity and can preheat cold water by 5~10 degrees Celsius. If the thermoelectric generator is used to preheat the cold water first, and then the oil-water heat exchanger is used to recover the waste heat, the overall efficiency of the system can be greatly improved." September 7 In the morning, employees from Zhejiang Huzhou Power Supply Company and Zhejiang Electric Power Research Institute conducted research on the optimization scheme of the transformer waste heat recovery and utilization system, and repeatedly demonstrated the application of the system. At present, the system has the engineering application conditions.
The transformer waste heat recovery and utilization system is a system independently developed by State Grid Zhejiang Electric Power Co., Ltd. in order to deeply awaken, efficiently recover waste heat resources, and help the whole society to save energy and reduce carbon. According to the plan, the system will be applied to Huzhou 110kV Anji Chengbei Power Transmission and Transformation Project.
Transformers have their own operating losses, 99% of which are mainly lost in the form of thermal energy. In response to this problem, Huzhou Power Supply Company and Zhejiang Electric Power Research Institute innovatively proposed the construction of a transformer waste heat recovery and utilization system, which comprehensively utilizes oil-water heat exchangers, heat pump units and thermoelectric generators. It is a key link to realize the efficient recovery and utilization of transformer waste heat resources.
"We have already made plans. If the system is widely used in transformers of 35 kV and above in my country, it can save 44.89 billion kWh of electrical energy and reduce carbon emissions by about 26 million tons every year. While reducing transformer losses, it can also improve The overload capacity of the equipment is 1.1 times, and the service life is extended by 3 to 5 years." Li Danle, a member of the project team of the Economic and Technological Research Institute of Huzhou Power Supply Company, introduced.
The first link of the transformer waste heat recovery and utilization system is "heat recovery". The oil-water heat exchanger of the system fully absorbs the high-temperature waste heat carried by the cooling oil of the transformer, and turns cold water into hot water. Then, the laser semi-brazing technology is used to seal the cold and hot ends of the heat exchanger with rubber pads and brazing, respectively, to safely and efficiently introduce "oil heat into water". At the same time, in order to make full use of the waste heat resources of the transformer, the system reasonably selects the heat pump unit for heating, and automatically controls the outlet water temperature, so that the energy extraction is more efficient and the output is more stable.
Thermal power generation is the second link of the system. In this link, the system uses thermal power generation technology, and the generated electricity is used by the substation. "In order to convert thermal energy into electricity more efficiently, we optimized the internal structure of the thermoelectric generator module in the system, and developed an intelligent thermoelectric management system to realize functions such as voltage regulation, voltage regulation, and fault alarm. Stable operation under working conditions." Xu Chaoyang, head of the construction department of Huzhou Power Supply Company, introduced. On this basis, the system also integrates thermoelectric power generation technology, and uses the electric heating cascade energy consumption mode to realize the electric heating cascade power supply of "generating first, then using energy", maximizing the utilization of energy cascades and improving the energy cycle of the system. usage efficiency.
In addition to power generation, the recovered waste heat can also be used for secondary use, which is also the third link of the system - "heat dissipation". The hot water generated by the system can not only be consumed in the substation, but can also be transported to surrounding buildings in the form of consumption subsidies, serving scenarios such as rural greenhouse planting, agricultural drying, and greenhouse farming. According to estimates, the recovered hot water from a 220 kV substation can cover about 1.5 kilometers around the site, meet the energy demand of 47,000 square meters of rural greenhouses, benefit farmers and people, and help rural revitalization.
Hengfengyou Electric focuses on the manufacture and export of various distribution transformers, rectifier transformers, electric furnace transformers, mining transformers, and has been exported to Uzbekistan, Kazakhstan, Pakistan, Kuwait, Iraq, United Arab Emirates, Zimbabwe, Tanzania, South Africa, the United States, Spain and other more than 30 countries and regions around the world. Thirty years of experience in power transformer manufacturing and sales, Hengfengyou Electric will provide you with the best electrical product solutions, www.hengfengyou.com ; info@hengfengyou.com; WhatsApp: +86158 5325 2696 (Jack) +86158 5326 5269 (Alisa)
