How to Develop Thermal Power Denitration Catalysts
Publishdate：2019-04-30 Views：17
Now, the issue of air pollution needs to be taken seriously, and many technologies are constantly being updated. How is the development of thermal power denitrification catalysts? The implementation of denitrification in industries such as thermal power, steel, and cement is aimed at reducing the emissions of nitrogen oxides and other pollutants, avoiding the formation of secondary pollution such as ozone, PM2.5, and photochemical smog. Moreover, discarded denitrification catalysts are hazardous waste and pose a great threat to the ecological environment.
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.
"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.
Most domestic enterprises, especially large ones, have chosen to import catalysts. 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 exceeding the standard, the enterprise will face production shutdown or huge fines.
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.
At present, the basic treatment method is 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 the front-end is also driven by the end. If a strong oxidation process is added and the calcium sulfate content is increased during the desulfurization project, desulfurization gypsum will 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."
Now, the issue of air pollution needs to be taken seriously, and many technologies are constantly being updated. How is the development of thermal power denitrification catalysts? The implementation of denitrification in industries such as thermal power, steel, and cement is aimed at reducing the emissions of nitrogen oxides and other pollutants, avoiding the formation of secondary pollution such as ozone, PM2.5, and photochemical smog. Moreover, discarded denitrification catalysts are hazardous waste and pose a great threat to the ecological environment.
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.
"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.
Most domestic enterprises, especially large ones, have chosen to import catalysts. 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 exceeding the standard, the enterprise will face production shutdown or huge fines.
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.
At present, the basic treatment method is 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 the front-end is also driven by the end. If a strong oxidation process is added and the calcium sulfate content is increased during the desulfurization project, desulfurization gypsum will 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."
