In the development history of China's power industry, the Taizhou Power Plant of the National Energy Group, located in the central part of Jiangsu and on the north bank of the Yangtze River, is a name that can stand out in the annals of history. Four million kilowatt units, with secondary reheating, have created three "the world's highest" achievements: the highest electricity efficiency, the lowest coal consumption index, and the best environmental protection index... Each achievement emits a dazzling light.

On June 2nd, the attention of the entire industry gathered here again, and the largest coal-fired power CCUS project in Asia, the National Energy Group Taizhou 500000 ton/year CCUS project, successfully passed the full load trial operation. In the journey of implementing the "dual carbon" goal and promoting clean utilization of coal in the coal power industry, the National Energy Group has created a new model of carbon reduction and sequestration.

Our system operates safely, reliably, and efficiently, with all indicators surpassing the design values and being at the industry's optimal level. This marks another important breakthrough for National Energy Group in resolutely doing a good job in coal power projects and actively expanding the entire process of green and low-carbon production methods of'source reduction, process control, and terminal carbon capture'.Ji Mingbin, Secretary of the Party Committee and Chairman of National Company, said.

Leading technical indicators in the industry

In a corner of the Taizhou Power Plant area, four huge spherical gas storage tanks are arranged in sequence. Several long pipelines are connected to it.The total area of our capture area is only 1650 square meters, which is the smallest compared with the existing project. Yang Yang, manager of the carbon capture research office of the carbon neutrality Center of the National Energy Group the New Energy Technology Research Institute, said at the project site.

The small size is just the most intuitive impression this project brings, and behind the intricate pipelines and huge gas storage tanks, groups of data amaze every visitor

The heat consumption per ton of carbon dioxide capture is less than 2.4 gigajoules, the power consumption is less than 90 kilowatt hours, the carbon dioxide capture rate is greater than 90%, and the purity of dry carbon dioxide produced is greater than 99.99%. All indicators are at the leading level in the industry.

The strengths of the Taizhou CCUS project are clearly far beyond this.

In terms of technological innovation, the project has developed a new type of low energy consumption, high capacity, and high stability ter composite absorbent, which reduces the regeneration heat consumption by more than 35% compared to traditional absorbers; We have developed a small tooth tip angle carbon capture filler, which reduces the mass transfer efficiency by 15% -30% compared to conventional fillers and increases the mass transfer efficiency by 10% -15%; Optimized the internal distributor of the tower, reduced the pressure drop of the absorption tower by 5-10%, and increased the mass transfer efficiency of the entire tower by 5-10%; We have developed a new dry amine recovery device, which reduces amine loss by 30% compared to traditional devices.

In terms of process innovation, the post installation design of the water washing tower is adopted to solve safety hazards such as high humidity at the inlet of the induced draft fan in previous projects; adopting a circulating water direct current water supply cooling system to reduce investment and capture electricity consumption of approximately 6 kWh/ton of carbon dioxide; Adopting the exhaust steam of the turbine driven induced draft fan of the power generation unit in the factory as the main steam source for regeneration steam, achieving energy consumption coupling and reducing overall energy consumption; Adopting interstage cooling and split flow desorption processes to reduce regeneration heat consumption; Adopting the process of regenerating steam heat and recovering it to the condensate of the main engine to reduce heat loss.

In terms of equipment optimization, the project selects variable frequency adjustable centrifugal induced draft fans, with an economical adjustable load range of 60% -100%, and can save 20% of energy under variable operating conditions; a variable frequency adjustable centrifugal compressor is selected. with 40% -100% load adjustable capacity, saving 30% of energy compared with the traditional screw compressor; adopting a new type of material plate heat exchanger, it has the characteristics of resistance, anti -fouling, and easy cleaning. The equipment maintenance time can be shortened by 2-3 days. At the same time, optimizing the configuration of storage tanks and constructing two 400 cubic meter food grade storage tanks will make the system operation more flexible and controllable.

Over 1000 repeated tests

As the Western proverb goes, "Rome was not built in a day. The successful operation of the largest coal power CCUS project in Asia witnessed the National Energy Group's focus on the cutting-edge technology of clean coal utilization, the key core technologies of CCUS, and the continuous increase in scientific research investment and research and development efforts, accelerating the transformation of scientific research achievements and the promotion of industrialization.

For the clean utilization of coal, National Energy Group has a complex. In order to ensure the smooth implementation and timely completion of the project, Taizhou Power Plant, National Energy Group New Energy Technology Research Institute, and National Energy Longyuan Environmental Protection Co., Ltd. have joined forces with China Electric Power Engineering East China Electric Power Design Institute, Sinopec Nanjing Engineering Co., Ltd., Zhejiang University, Tsinghua University, Southeast University, and other universities and research institutes sent elite personnel to invest in the design, research and development, construction, and commissioning of the project.

From the high-quality start of the project in March 2022 to its official operation on June 3, 2023, over a year, facing the repeated invasion of the epidemic, difficulties in technical research, and the scorching heat of summer construction, they handed over a beautiful transcript.

As the technical director of the project, Xu Dong, director of the carbon neutrality Center of the New Energy Technology Research Institute of the National Energy Group, still clearly remembers the days during the absorb testing phase.

Absorbers are the 'heart " of the CCUS project's technical process. Only after determining the indicators and plans of the absorbers can we proceed with subsequent work such as equipment selection. Although we have had successful experience in the 150000 ton/year CCUS project in the Jinjie project, the increase from 150000 tons to 500000 tons is not simply a combination of quantities, but rather requires technological reconstruction and innovation to find the optimal solution

During that time, Xu Dong led his research and development team to continuously adjust the ratio scheme of absorbers in order to find the optimal solution that they had been dreaming of. And they tested this adjustment over 1000 times.

When the development of low energy consumption, high capacity, and high stability ter composite absorbers was finally successful, their hanging hearts finally landed.

Our project has been successfully put into production to this day and is in a leading position in the industry. As a participant who has gone through the entire construction process, I am moved by the wisdom and resilience of our Chinese people.Li Si, Technical Director of the Carbon Resource Development Special Office of Jiangsu Taizhou Power Plant, said excitedly.

During the project, the National Energy Group independently developed large-scale carbon capture process packages, collaborated with Zhejiang University to develop carbon capture materials, and Tsinghua University to develop small tooth top angle fillers, promoting technological innovation in the process. Collaborating with Shaanxi Bl to develop the first domestically produced large grade carbon dioxide compressor, achieving 100% localization of project equipment

The people of the National Energy Group have provided the best interpretation of this wisdom and resilience.

Laying a solid foundation for large-scale promotion

On May 27th, the first batch of liquid carbon dioxide produced during the trial operation of the Taizhou CC project was delivered to the first batch of users.

The quality is very good.A few hours later, the feedback call from the users excited every project participant.

As of now, Taizhou Power Plant has signed carbon dioxide purchase and sales contracts with 8 units, with a contract volume of over 40000 tons per month. The economic benefits are significant, as the sustainable operation of the project provides strong support.

However, in the journey of implementing the "dual carbon" goal and promoting the clean utilization of coal, the people of the National Energy Group have seen both the nearby green grass and the distant jungle.

The successful operation of the Taizhou project marks the gradual maturity of China's large-scale coal-fired power CC technology, laying a solid foundation for the subsequent development of larger scale carbon dioxide capture and utilization.

Coal power will still play a significant role in'basic guarantee + system regulation'in the current and future for a long period of time. The advanced and efficient secondary reheat coal power units of Taizhou Power Plant will implement a large-scale CCUS project to achieve large-scale carbon capture and use, providing 'national energy experience'forachieving near zero carbon dioxide emissions from coal power in the future.said Chu Jingchun, Secretary of the Party Committee and Chairman of the New Energy Technology Research Institute of the National Energy Group, The inability to fully absorb carbon dioxide has always been a blocking point for the sustainable operation of the CCU project. Taizhou Power Plant, through research into surrounding parks and enterprises, connected with the demand for carbon dioxide use, effectively penetrated the regional carbon cycle, achieved the full consumption of 500000 tons/year, and has stable profitability.laya foundation for the project to achieve full production and provide samples for the long-term sustainable operation of coal Power CCUS, becoming a demonstration case for collaborative efforts in the innovation chain.

Next, we will make collaborative breakthroughs in carbon dioxide hydrogen to methanol and fine chemicals, further enhancing the value of carbon dioxide, "said Jiang Xinjun, Deputy Secretary of the Party Committee and General Manager of Taizhou Power Plant.

In China, coal-fired power is a major industry. The wise and resilient members of the National Energy Group have played the most beautiful melody of the green development of coal-fired power, leaving behind beautiful movements and more surprises than can be expected. Amidst the sound of the rolling Yangtze River, they have traversed the wind and rain and welcomed hope.