The Reuse of Thermal Power Denitration Catalysts is Imperative
Publishdate：2019-04-04 Views：17
Keywords: denitrification catalyst. The implementation of denitrification in industries such as thermal power, steel, and cement is aimed at reducing the emissions of pollutants such as nitrogen oxides and avoiding the formation of secondary pollution such as ozone, PM2.5, and photochemical smog.
"It is expected that after 2019, the annual waste of SCR (Selective Catalytic Reduction) denitrification catalysts in thermal power plants across the country will reach 50 million cubic meters." Professor Xu Dongyao from the Department of Environment and Biotechnology at China University of Mining and Technology (Beijing) stated in an interview with Science and Technology Daily that the waste denitrification catalysts belong to hazardous waste, and the annual treatment cost is at least 100 billion yuan, posing a huge threat to the ecological environment.
2019 will usher in a peak in the scrapping of denitrification catalysts
SCR commonly used denitrification catalysts use materials such as titanium dioxide, vanadium, and tungsten as carriers and catalytic active substances, which themselves have potential environmental hazards; During use, heavy metals such as chromium, beryllium, arsenic, and mercury in the flue gas will adsorb and accumulate on the catalyst, making it a harmful material containing various heavy metal components. Therefore, developed countries and China have included "waste flue gas denitrification catalysts (vanadium titanium series)" in hazardous waste.
According to the data released by the Desulfurization and Denitration Committee of the China Environmental Protection Industry Association, as of the end of 2016, the capacity of flue gas denitrification units in thermal power plants in China was about 864 million kilowatts, accounting for 82% of the national thermal power unit capacity and 91.7% of the national coal-fired power unit capacity.
Xu Dongyao said that China's thermal power units have been undergoing large-scale SCR denitrification projects since 2013, with about 80% using imported catalysts and a service life of about 5 years. Therefore, 2019 will usher in the second peak of catalyst scrapping. It is expected that only the thermal power industry will waste up to 50 million cubic meters of catalysts annually. According to the low treatment cost of 2000 yuan/ton for hazardous waste, the annual treatment cost is as high as 100 billion yuan.
"With the deepening of air pollution control, in addition to the thermal power industry, China has also put forward denitrification requirements for the steel, cement, and glass industries, which may also expand to chemical and industrial boilers in the future. It can be said that the total amount of discarded catalysts will only increase every year, and the pressure on the ecological environment will also increase sharply." Xu Dongyao said.
The gap between catalyst technology and international advanced level is about 10 years
Although currently, domestic denitrification catalysts are priced at around 30000 to 40000 yuan/cubic meter, while imported ones are priced at around 50000 yuan/cubic meter. But most domestic enterprises, especially large ones, have chosen to import catalysts.
Xu Dongyao said that this is a helpless choice based on reality. The gap between China's denitrification catalyst technology and international standards is about 10 years. The average service life of domestic catalysts is 3 years, while imported ones are 5 years; The accuracy of domestic catalyst denitrification indicators is unstable, and the deviation from imports does not exceed 5%. "For large enterprises such as thermal power and steel that produce 24 hours a day, the cost of shutting down and replacing catalysts is huge. If the denitrification efficiency is unstable, and the emissions of nitrogen oxides and other pollutants are high and low, once recognized by the environmental protection department as excessive emissions, the enterprise will face production stoppage or huge fines."
Intensify research and development efforts in the "blank space" of waste recycling
At present, China adopts a qualification management system for hazardous waste treatment enterprises, which means that hazardous waste treatment enterprises must have relevant qualifications. Due to the limited number of qualified enterprises for disposal, the price of hazardous waste disposal has been soaring in recent years, and many hazardous wastes cannot be disposed of in a timely manner. Xu Dongyao suggested that preparations should be made in advance to take into account the peak of catalyst waste.
The State Council also pointed out in the report on the inspection report and deliberation opinions on the enforcement of the Law on the Prevention and Control of Environmental Pollution by Solid Waste that the construction of centralized disposal facilities for hazardous waste will be promoted in the future.
"Waste denitrification catalysts are renewable and resource oriented," said Xu Dongyao. Currently, the international treatment method for them is basically landfill. China can start from this "blank space" and increase support for the research and development of waste catalyst regeneration and resource utilization technologies. In this way, not only can a large amount of resources be saved, as well as the transportation and disposal costs of such hazardous waste, avoiding the adverse effects of incineration or landfill on the ecological environment, but also the front-end is pulled from the end, shortening the technological gap with the international market for 10 years, and achieving a breakthrough in the curve.
According to statistics, the cumulative stock of desulfurization gypsum in China is about 130 million tons, occupying a large amount of land. Xu Dongyao said that if a strong oxidation process was added and the calcium sulfate content was increased during the desulfurization project, desulfurization gypsum would become a qualified raw material for cement production, which can greatly alleviate the environmental problems caused by desulfurization gypsum. "Therefore, in terms of discarded denitration catalysts, we should avoid the same mistakes as desulfurization gypsum and plan and start early."
Keywords: denitrification catalyst. The implementation of denitrification in industries such as thermal power, steel, and cement is aimed at reducing the emissions of pollutants such as nitrogen oxides and avoiding the formation of secondary pollution such as ozone, PM2.5, and photochemical smog.
"It is expected that after 2019, the annual waste of SCR (Selective Catalytic Reduction) denitrification catalysts in thermal power plants across the country will reach 50 million cubic meters." Professor Xu Dongyao from the Department of Environment and Biotechnology at China University of Mining and Technology (Beijing) stated in an interview with Science and Technology Daily that the waste denitrification catalysts belong to hazardous waste, and the annual treatment cost is at least 100 billion yuan, posing a huge threat to the ecological environment.
2019 will usher in a peak in the scrapping of denitrification catalysts
SCR commonly used denitrification catalysts use materials such as titanium dioxide, vanadium, and tungsten as carriers and catalytic active substances, which themselves have potential environmental hazards; During use, heavy metals such as chromium, beryllium, arsenic, and mercury in the flue gas will adsorb and accumulate on the catalyst, making it a harmful material containing various heavy metal components. Therefore, developed countries and China have included "waste flue gas denitrification catalysts (vanadium titanium series)" in hazardous waste.
According to the data released by the Desulfurization and Denitration Committee of the China Environmental Protection Industry Association, as of the end of 2016, the capacity of flue gas denitrification units in thermal power plants in China was about 864 million kilowatts, accounting for 82% of the national thermal power unit capacity and 91.7% of the national coal-fired power unit capacity.
Xu Dongyao said that China's thermal power units have been undergoing large-scale SCR denitrification projects since 2013, with about 80% using imported catalysts and a service life of about 5 years. Therefore, 2019 will usher in the second peak of catalyst scrapping. It is expected that only the thermal power industry will waste up to 50 million cubic meters of catalysts annually. According to the low treatment cost of 2000 yuan/ton for hazardous waste, the annual treatment cost is as high as 100 billion yuan.
"With the deepening of air pollution control, in addition to the thermal power industry, China has also put forward denitrification requirements for the steel, cement, and glass industries, which may also expand to chemical and industrial boilers in the future. It can be said that the total amount of discarded catalysts will only increase every year, and the pressure on the ecological environment will also increase sharply." Xu Dongyao said.
The gap between catalyst technology and international advanced level is about 10 years
Although currently, domestic denitrification catalysts are priced at around 30000 to 40000 yuan/cubic meter, while imported ones are priced at around 50000 yuan/cubic meter. But most domestic enterprises, especially large ones, have chosen to import catalysts.
Xu Dongyao said that this is a helpless choice based on reality. The gap between China's denitrification catalyst technology and international standards is about 10 years. The average service life of domestic catalysts is 3 years, while imported ones are 5 years; The accuracy of domestic catalyst denitrification indicators is unstable, and the deviation from imports does not exceed 5%. "For large enterprises such as thermal power and steel that produce 24 hours a day, the cost of shutting down and replacing catalysts is huge. If the denitrification efficiency is unstable, and the emissions of nitrogen oxides and other pollutants are high and low, once recognized by the environmental protection department as excessive emissions, the enterprise will face production stoppage or huge fines."
Intensify research and development efforts in the "blank space" of waste recycling
At present, China adopts a qualification management system for hazardous waste treatment enterprises, which means that hazardous waste treatment enterprises must have relevant qualifications. Due to the limited number of qualified enterprises for disposal, the price of hazardous waste disposal has been soaring in recent years, and many hazardous wastes cannot be disposed of in a timely manner. Xu Dongyao suggested that preparations should be made in advance to take into account the peak of catalyst waste.
The State Council also pointed out in the report on the inspection report and deliberation opinions on the enforcement of the Law on the Prevention and Control of Environmental Pollution by Solid Waste that the construction of centralized disposal facilities for hazardous waste will be promoted in the future.
"Waste denitrification catalysts are renewable and resource oriented," said Xu Dongyao. Currently, the international treatment method for them is basically landfill. China can start from this "blank space" and increase support for the research and development of waste catalyst regeneration and resource utilization technologies. In this way, not only can a large amount of resources be saved, as well as the transportation and disposal costs of such hazardous waste, avoiding the adverse effects of incineration or landfill on the ecological environment, but also the front-end is pulled from the end, shortening the technological gap with the international market for 10 years, and achieving a breakthrough in the curve.
According to statistics, the cumulative stock of desulfurization gypsum in China is about 130 million tons, occupying a large amount of land. Xu Dongyao said that if a strong oxidation process was added and the calcium sulfate content was increased during the desulfurization project, desulfurization gypsum would become a qualified raw material for cement production, which can greatly alleviate the environmental problems caused by desulfurization gypsum. "Therefore, in terms of discarded denitration catalysts, we should avoid the same mistakes as desulfurization gypsum and plan and start early."
