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: China's thermal power pollution gas emission decreased by 60%

via:CnBeta     time:2019/10/9 20:43:31     readed:486

On October 7th, from China and Britain, the study team published an academic paper called the "ultra-low emission standard" in the journal of Nature Energy. After a case study of China's air data from 2014 to 2017, It is concluded that, since 2014, China's ultra-low emissions (ULE) modification measures for coal-fired thermal power units have achieved remarkable results.

The results show that the emissions of SO2, NOX and other particulate matter from all types of thermal power units in 2017 are significantly lower than those in 2014, with the decreases of 65%, 60% and 72% respectively, leading the world and far below the world average level. This means that the target of ultra-low emission renovation has been overfulfilled, and the overall emissions of sulfur dioxide, nitrogen oxides and soot from thermal power plants in China have decreased by more than 60%.

Screenshot of Natural Energy

The team has monitored and analyzed waste gas emissions from coal, oil, natural gas and biomass power plants in recent years and concluded that coal-fired power plants are the main cause of environmental air pollution. This means that how to control emissions from coal-fired power plants is of great significance to the improvement of air quality in developing countries such as China.

Since September 2014, China has formulated a policy of "ultra-low emission transformation" for thermal power coal-fired units, the main source of pollution emissions, and plans to complete the transformation of 580 million kilowatts of coal-fired units by 2020, accounting for 71 percent of the total installed capacity in 2014.

Distribution of power generation energy in China and comparison of average emissions with ULE standards from 2014 to 2017 (paper chart, the same below)

China is steadily achieving its 2020 emission reduction target

(Science Daily), an American academic media, published an article on the same day, "China is steadily meeting its 2020 emission target," reporting on the academic paper published in the journal Natural Energy.

In 2014, China formally introduced a policy of ultra-low emission (ULE) standards aimed at retrofitting coal-fired generating units to limit emissions of sulphur dioxide, nitrogen oxides and other particulates to 35, 50 and 10 mg/m3, respectively, according to the Science Daily, citing the paper.GasTurbine unit standard. This paper describes China's policy as "ambitious".

The results show that, despite the continuous growth of power generation in China, the emissions of SO2, NOX and other particulate matter from all types of thermal power units in 2017 decreased significantly from 2014, by 65%, 60% and 72%, respectively, from 2.21 million tons, 3.11 million tons and 520,000 tons to 770,000 tons, 1.26 million tons and 140,000 tons, respectively. This indicates that:2In 2017,The target of ultra-low emission renovation has been overfulfilledIn China, the emissions of sulphur dioxide, nitrogen oxides and soot from thermal power plants decreased by more than 60%.

The study found that, benefiting from the implementation of strict emission monitoring system and effective economic incentive mechanism and the promotion and upgrading of core ultra-low emission technologies, China had successfully transformed 590 million kilowatts of existing coal-fired power units into ultra-low emission units by the end of 2017, and exceeded the policy targets ahead of schedule.

Among them, the eastern region and large-scale units have the strongest policy pertinence, the largest proportion of installed units, and the most significant emission reduction efficiency; the western region and small-scale units have relatively broad policy pertinence, large space for technological improvement, and still have great potential for emission reduction.

The research team said that the successful implementation of ultra-low emission transformation in the thermal power industry is of great significance. Its emission reduction effect will effectively inspire the morale of haze control, and successful experience will directly promote the realization of haze control goals.

According to the Science Daily, this means that if all thermal power plants in China can meet ultra-low emission standards by 2020, China is expected to achieve further emission reduction.

Emissions of polluted gases decreased year by year from 2014 to 2017, and ULE standard was adopted in China in December 2014.

Continuous Emission Monitoring System NetworkConstruction of (CEMS)

The Sino-British Joint academic Group built a network of continuous emission monitoring systems (China) covering 96 to 98 per cent of China's thermal capacity for the first time between 2014 and 2017.

In addition, according to data from the newly established Continuous Emission Monitoring System (CEMS), previous methods for estimating China's electricity emissions have overestimated at least 18% and, in some cases, 92%. This error is explained in this paper: the data of previous studies originated from the pre-use of CEMS monitoring system, i.e. the pre-introduction data of ultra-low emission standards were assumed based on the pre-study principle, while the post-study principle was adopted in this study, all of which were real-time data.

The panel emphasized the importance and accuracy of ex post assessment, and said that CEAP system is currently open to the public, and will continue to present, organize and analyze emission reduction data from coal-fired thermal power units in China, hoping to provide technical and empirical support for other countries.

Illustrations of papers

Dr. Zhifu Mi, one of the co-authors, from the Bartlett School of Construction and Project Management at University College London, concluded the paper by saying: "This is encouraging news for China and other countries that want to reduce power pollution. Coal is the most widely used fuel in China. It is very challenging to reduce the number of thermal power plants in a short time.However, these significant emission reduction results show that it is technically and economically feasible to maintain ultra-low emission standards for power plants, which is an important step in reducing air pollution."

Li Ganjie, Minister of Ecology and Environment, said recently that "the proportion of ultra-low emission transformation of thermal power has reached more than 80%", "the proportion of coal has been very high in the past, about 70% in 2011 and 2012, and 59% in last year, which is not easy". At the same time, Li Ganjie said that the situation of blue sky defense and air pollution prevention and control is still grim, and it is still in the stage of "feeding on the sky". We should have patience and perseverance in fighting a protracted war, including sometimes looking at problems objectively and with a common mind.

The research was carried out by Beijing University of Chemical Industry, Beijing University of Aeronautics and Astronautics, Ministry of Environmental Protection of China, Hebei University of Science and Technology, Beijing University of Science and Technology, Xi'an Jiaotong University, Cambridge University and Chinese Academy of Sciences. The project is funded by the National Outstanding Youth Science Foundation of China, the National Top Young Professionals Support Program and the National Research Program on Key Issues of Air Pollution Control.

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