To meet the new South Africa emission regulations and further reduce particulate emissions, a major South African company decided to upgrade the electrostatic precipitators (ESP) at one of its power plants with 6×660MW units. The plan was to replace the existing utility frequency high-voltage power supplies with high-frequency power supplies (HFPS) that achieve IP66 high protection certification issued by SGS, while also meeting both national and corporate standards. This project was tendered globally in two phases.

Fujian Longking, having independently developed a new modulation-type HPFS tailored for the D-MEC (Dry Multi Emission Control) industry chain, stood out in the competitive bidding against numerous European and American counterparts, and successfully won the Phase I project in 2020 with its excellent product performance and high-level, quick-response customized service.

HFPS Renewed by Longking

Despite the COVID-19 pandemic, Fujian Longking completed the design and manufacturing of the first batch of HFPS in less than 50 days, and successfully completed the factory acceptance test.

In November 2020, the first batch of 20 Longking HFPS was successfully installed for the first 660MW unit and put into operation after a one-time commissioning. The dust emission concentration at the ESP outlet was reduced from the original 250-300mg/Nm³ to 48.8mg/Nm³, which is well below the contractual requirement (100mg/Nm³). Fujian Longking continued to manufacture, deliver and commission the remaining power supplies in 2021 and 2022. After more than four years of service, the South African company highly praise the Longking HPFS performance and awarded Fujian Longking the Phase II project in 2024.

The modulation-type HFPS, developed by Fujian Longking for the D-MEC industry chain, effectively resolves the performance shortcomings of old ESPs and easily adapts to harsh environments and complex working conditions. Longking HPFS has significantly improved the ESP efficiency of the large-scale power plants in South Africa, providing a successful example of ESP upgrades without major retrofit work to the main body. This project offers valuable insights for improving ESP efficiency at both coal-fired power plants and industrial plants.