Selective catalytic reduction (SCR) is the main technology to control NOx emission from fixed pollution sources. The core of this technology is SCR denitration catalyst. At present, vanadium tungsten series medium and high temperature catalysts with TiO2 as carrier are widely used in industry (reaction temperature is 300 ℃ ~ 420 ℃). In order to make use of the flue gas temperature, the SCR reactor device is generally arranged before dust removal and desulfurization, but in this position, the catalyst needs to bear the impact of large dust particles and the toxic effect of SO2, and the service life of the catalyst is seriously affected. In addition, the flue gas temperature of iron and steel, chemical industry, coking, waste incineration, biomass power generation, small boilers, cement, ceramics and other industries is generally below 300 ℃, and some are even only about 100 ℃, which can not meet the use requirements of medium and high temperature SCR catalyst. It is necessary to raise the temperature to above 300 ℃, which consumes a lot of energy, which limits the application of SCR denitration technology in these industries. The low-temperature SCR denitration catalyst shows good catalytic activity at the working temperature of 120 ℃ ~ 300 ℃. It can be arranged behind the dust removal device to greatly reduce the impact of dust on the catalyst. Denitration can be carried out without heating up or raising less temperature, so as to achieve the goal of ultra-low emission, greatly reduce energy consumption and reduce carbon emission. Low temperature SCR technology is very suitable for steel, chemical industry, coking, waste incineration, biomass power generation, small boiler, cement, ceramics and other industries. It has achieved good economic and social benefits for customers and won unanimous praise from users. Therefore, vigorously promoting and applying low-temperature catalyst denitration technology is in line with the spirit of bringing "carbon peaking and carbon neutralization" into the overall layout of ecological civilization construction proposed by the Party Central Committee.
"Low temperature SCR denitration process", as a denitration technology with high starting point and high efficiency, can be well integrated into the existing environmental protection process routes of various industries to make it more consistent with the eternal concept of "energy conservation and emission reduction". It can be said that "low temperature Denitration Process" is the brightest guiding light on the road of environmental protection development. All industries and ecological and environmental departments have the responsibility and obligation to make good use of this light as soon as possible, make it work as soon as possible, and create more economic and social benefits.
Low temperature SCR denitration process is a new and advanced denitration process. It is a world leading breakthrough scientific and technological achievement and has good benefits of energy conservation, emission reduction and carbon emission reduction. It will promote the transformation of denitration technology and the improvement of environmental protection technology in China. Low temperature SCR denitration process can be applied to power generation, iron and steel, metallurgy, chemical industry, coking, cement, waste incineration, biomass power generation, industrial furnaces and other industries. Since denitration can be carried out without heating the flue gas above 300 ℃, additional energy consumption is avoided and the "energy consumption and emission reduction phenomenon" (denitration by heating energy consumption to increase the flue gas temperature) prevalent in some industries is avoided. At the same time, Significantly reduce the carbon emissions generated by heating combustion, which has played a good role in saving social resources and protecting the ecological environment. In particular, the flue gas treatment of sintering, pelletizing, coke oven, heating furnace, annealing furnace, hot blast furnace, lime kiln and boiler in iron and steel enterprises is an important part of the above problems, in which denitration technology is the top priority. Promote the implementation of ultra-low emissions from the steel industry, significantly reduce the emissions of major air pollutants, and promote the continuous improvement of ambient air quality. Establish a new yardstick for green development of the industry and promote the overall transformation and upgrading of the industry; Implement differentiated environmental protection policies. With the improvement of ambient air quality as the core and focusing on the goal and task of winning the blue sky defense war, we took the lead in the key areas of air pollution prevention and control such as Beijing Tianjin Hebei and its surrounding areas, the Yangtze River Delta, the Pearl River Delta and Fenwei plain.
To sum up, the application of low-temperature SCR denitration technology and its catalyst can not only bring huge economic benefits to all walks of life in China, but also bring great effects of saving resources to the society. At the same time, it can make positive contributions to the protection of ecological environment, the promotion of the construction of a beautiful China and the realization of harmonious coexistence between man and nature. It will be of great practical significance to popularize the application of this technology on a large scale. However, a really good high-tech will often encounter all kinds of difficulties and resistance in the actual promotion and application process. Most enterprises do not have the ability of "seeing the Pearl" and the knowledge of new technology, and are proud of "not being the first to eat crabs". It is extremely abnormal to make important technological achievements with core breakthroughs difficult in the promotion and application process. In a letter congratulating the 70th anniversary of the founding of the Chinese Academy of Sciences, General Secretary Xi stressed that "we should speed up the creation of the original source of innovation and accelerate the breakthrough of key core technologies". It is a great waste of technology and runs counter to the spirit of innovation and breakthrough and industrial upgrading advocated by the central government. There is no reason for high-level technology and good process technology route to be rejected by relevant enterprises. In order to prevent good technology from being submerged in "backward technology awareness" and "negative inaction of environmental protection", relevant government departments at all levels, especially environmental protection departments and even the Ministry of ecological environment, should give strong support and environmental protection policy support, strengthen the promotion of excellent flue gas treatment technology, formulate corresponding mandatory regulations, promote new technology, strengthen the main responsibility of enterprises and increase capital investment, Strictly control the project quality, strengthen operation management, strengthen the joint punishment of multiple departments, give better play to the role of the government, form effective incentives and constraints, enhance service awareness, and help enterprises formulate comprehensive treatment plans. Especially for iron and steel enterprises, it is suggested that all new (including relocation) iron and steel projects across the country should reach the ultra-low emission level in principle. By the end of 2025, the ultra-low emission transformation of iron and steel enterprises in key regions will be basically completed, and the whole country will strive to complete the transformation of more than 90% of the production capacity. Organized emission control indicators: the hourly average emission concentrations of particulate matter, sulfur dioxide and nitrogen oxides from sintering machine head and pellet roasting flue gas shall not be higher than 10, 35 and 50 mg / m3 respectively. For iron and steel enterprises with ultra-low emission, the hourly average emission concentration in at least 95% of the time period each month meets the above requirements.
It is a legal responsibility for iron and steel enterprises to meet the emission standards, and ultra-low emission is the incentive orientation. For iron and steel enterprises that have completed the transformation of ultra-low emission, we should strengthen policy support, and give policy support to environmental protection related tax laws, incentives and credit financing, differentiated electricity price policies, differentiated environmental protection management policies, and strengthen technical support.
In addition, the competent government departments and environmental protection departments should also formulate incentive policies, actively implement this new technology for other industries, urge relevant enterprises to implement denitration ultra-low emission standards step by step and in batches, save energy for the country, and give certain subsidies and policy preferences to enterprises that achieve consumption and emission reduction, so as to improve the enthusiasm of enterprises, so as to make this project of great environmental protection significance Advanced low-temperature denitration catalyst technology was successfully promoted and popularized.
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