en.Wedoany.com Reported - The Chongqing Huadian Tongnan Phase I 2×500 MW-class gas-electricity project, constructed by Shanghai Electric Power Construction, has successfully completed steam purging, transitioning the project from the previous installation phase to the overall start-up commissioning, marking a step closer to full-scale operation.
As a critical step before the overall start-up of the unit, steam purging aims to eliminate potential hazards such as tube bursts in heating surfaces or damage to turbine blades caused by impurity deposition during operation. It is an essential "physical examination" before the generator unit is put into service.
Given the technical characteristics of the unit—a 550 MW F-class "2-on-1" combined cycle with a triple-pressure, non-supplementary-fired natural circulation heat recovery steam generator—the project team adopted the energy storage and pressure reduction purging method. The process was carried out in three independent stages for the high, medium, and low-pressure systems, with separate target plate acceptance tests to ensure comprehensive coverage and quality control.
During the purging process, on-site technical personnel maintained round-the-clock monitoring and real-time adjustments, precisely controlling the heating rate of the steam pipes, steam pressure, and the number of purging cycles. After continuous operation, all indicators of the ignition and steam purging met the required standards, with excellent surface quality on the target plates, passing acceptance in a single attempt.
The Chongqing Huadian Tongnan Phase I 2×500 MW-class gas-electricity project has a total installed capacity of 1,100.24 MW, with a combined cycle efficiency of 61.66%. It currently features the largest single-unit capacity and highest efficiency among F-class heavy-duty gas turbines in China. Shanghai Electric Power Construction's First Company is responsible for the construction and installation of Unit 2, as well as the civil and installation works for the utility systems.
The successful completion of the steam purging has laid a solid foundation for the subsequent progress of the project. The project team will continue to strictly uphold quality and safety standards, fully advance the overall start-up commissioning, accelerate the timeline to operation, and strive for an early grid connection and power generation.
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