China's independent supercritical carbon dioxide cycle power generation test unit completed trial operation and its technology is leading in the world

On December 8th, the world's supercritical carbon dioxide cycle power generation test unit with the highest parameters and the largest capacity independently developed by China Huaneng Group Co.
, Ltd.
successfully completed 72-hour trial operation
in Huaneng Xi'an Thermal Engineering Institute 。 The successful operation of the unit with a power generation of 5 MW verifies the feasibility of industrial operation of supercritical carbon dioxide cycle power generation technology, which is expected to completely change the traditional thermal power generation technology with water vapor as the mainstream working fluid power generation mode for more than 140 years, marking that China has been at the world's leading level in the field of supercritical carbon dioxide cycle power generation technology, and provides an important path
for further improving energy utilization efficiency and achieving the "dual carbon" goal.

Supercritical carbon dioxide cycle power generation technology is an important transformative technology
in the field of thermal power generation.
Different from the traditional mainstream thermal power generation technology, this technology uses carbon dioxide as the circulating working medium, which has significant advantages
such as high thermoelectric conversion efficiency, small size of power equipment and system, and good flexibility.
Under the condition of main gas temperature of 600 °C, the thermoelectric conversion efficiency of this technology is increased by 3~5 percentage points compared with that of steam unit; When the same installed capacity, the length of the turbine spindle is only 1/25 of the steam turbine, and 0~100% full-load peak
regulation can be realized.

In recent years, top R&D institutions and power companies in the United States, France, Japan, South Korea and other countries have carried out a series of basic research and industrialization layout around this technology, trying to seize the technological dominance
in this field 。 In 2014, Huaneng launched the preliminary research of this technology without any relevant reference technology and experience, relying on Xi'an Thermal Engineering Institute to lead the establishment of an innovation team, and more than 30 institutions in the United Nations such as top universities, scientific research institutes, design, manufacturing enterprises and engineering construction and other innovation chains, upstream and downstream of the industrial chain carried out collective wisdom research, which lasted for 7 years and successfully overcame the key scientific and technical problems in multiple links such as circulation system construction, core equipment design, unit manufacturing and installation, and complete set of start-up and operation.
Independently designed and manufactured a number of key devices including supercritical carbon dioxide boiler, printed circuit board heat exchanger, turbine, compressor, dry gas seal, etc.
, and the localization rate of core equipment reached 100%.

During the 72-hour full-load operation of the test unit, the maximum temperature is 600 °C, the maximum pressure is 20 MPa, the power generation is 5 MW, and the system indicators fully meet the design requirements to achieve high standards of safe and stable operation
。 In the next stage, Huaneng will actively promote the research and development and application of supercritical carbon dioxide cycle power generation technology in the fields of high-efficiency solar thermal, electric thermal energy storage, advanced nuclear power and flexible thermal power, and plan to build a 50 MW supercritical carbon dioxide cycle power generation commercial demonstration power station during the "14th Five-Year Plan" period, so as to continue to maintain the global leader in the field of thermal power generation and accelerate the construction of a clean, low-carbon, safe and efficient energy system
.

At the same time, Xi'an Thermal Engineering Institute led the establishment of the supercritical carbon dioxide cycle power generation technology innovation consortium, aiming to provide a scientific and technological innovation highland, achievement transformation platform and institutional mechanism guarantee
for China to continue to lead the development of world thermal power generation technology.
The innovation consortium is composed of 40 universities, research institutes and leading enterprises, including Tsinghua University, Xi'an Jiaotong University, China Institute of Atomic Energy, Institute of Electrical Engineering of the Chinese Academy of
Sciences, and Harbin Boiler Factory.
The members of the consortium will accelerate the research and development, application and standardization of supercritical carbon dioxide cycle power generation technology, strive to achieve a number of original and leading major scientific and technological achievements, and help China accelerate the realization of high-level scientific and technological self-reliance
.