State Grid Longnan Power Supply Company: Turning “Waste” into “Electricity” – Clean Power “Refined” in Incinerators

On August 24, the 35kV outgoing line of the Domestic Waste Incineration Power Plant in Xihe County, Longnan City, Gansu Province, successfully closed the switch, marking the official integration of this environmental protection project into the Longnan power grid. This project not only completely solves the problem of harmless disposal of domestic waste and kitchen waste in Xihe County but also provides clean electricity for urban and rural residents through an innovative “waste-to-treasure” model.

On August 16, Wang Shan and Liang Bo, team members of the Secondary Substation Team of State Grid Longnan Power Supply Company, were conducting protection commissioning work on the 35kV Changlong Line at the 110kV Changdao Substation.

It is understood that as a project filling the gap in waste incineration power generation in Xihe County, Longnan City, Gansu Province, it plans to adopt one mechanical grate incinerator with a daily processing capacity of 500 tons (500td), build a new 35kV step-up substation, and connect to the 110kV Changdao Substation via one 35kV line. The annual domestic waste processing capacity can reach 180,000 tons, and the annual power generation capacity can reach 50 million kWh. This realizes the goals of “harmlessness, reduction, and resource utilization” in domestic waste treatment, provides clean electricity for urban and rural residents, and promotes the local ecological civilization construction.

Behind the smooth commissioning of the project is the efficient support of power engineering. As the unit responsible for the connection project, the Substation Operation and Maintenance Center of the company has been involved in advance since the project launch, and worked in coordination with the power generation enterprise to promote the synchronous construction of the main project and the outgoing project. It provided professional support throughout the process from planning and design to construction, formulated scientific connection plans, and finally built one 35kV outgoing line to efficiently serve the grid connection of power source customers.

During the project advancement, the Substation Operation and Maintenance Center of the company established a professional technical team to follow up on the project progress throughout the process. From the early equipment installation inspection, to the mid-term commissioning and acceptance, and then to the later commissioning coordination, the staff of the center were busy in every link. They strictly followed relevant standards and specifications to conduct detailed inspections and tests on the equipment of the outgoing line, ensuring that every piece of equipment and every line meets the safe operation requirements.

“The successful switch-on of the 35kV line of the Xihe County Domestic Waste Incineration Power Plant is both a challenge and an opportunity for us. We deeply feel the heavy responsibility and must go all out to ensure the project is safely and stably integrated into the power grid,” said the person in charge of the Substation Operation and Maintenance Center. During the commissioning preparation stage, the technicians of the Substation Operation and Maintenance Center used professional tools and rich experience to conduct a comprehensive inspection again on electrical performance, protection devices, and automation systems. Facing complex technical problems and the challenges of tight schedules and heavy tasks, they did not back down. Through repeated tests and data analysis, they timely identified and solved multiple potential problems, laying a solid foundation for the successful switch-on.

With the successful grid connection of the Xihe County Domestic Waste Incineration Power Plant in Longnan City, Gansu Province, a steady stream of clean electricity will be input into the national power grid, injecting dual momentum into urban governance and power system optimization. In the next step, the Substation Operation and Maintenance Center of State Grid Longnan Power Supply Company will continue to provide technical support and operation and maintenance work after grid connection, ensure the long-term stable operation of this environmental protection project, make greater contributions to the improvement of the local ecological environment and the optimization of the energy structure, and inject dual momentum into urban governance and power system optimization. (By Chen Yanlin/ Liu Bo)