2025 is the key time node for the transformation of ultra-low emission in cement industry. The Opinions on Promoting the Implementation of Ultra-low Emission in Cement Industry clearly promotes the implementation of ultra-low emission transformation in cement clinker production enterprises (excluding mines) and independent grinding stations (including cement enterprises producing special cement and co-disposing of solid waste).
By the end of 2025, significant progress will be made in key regions, striving to complete the transformation of 50% of cement clinker production capacity, and large state-owned enterprise groups in the region will basically complete the transformation of organized and unorganized ultra-low emissions. Some provinces in China have further refined their targets, requiring all cement clinker lines to complete ultra-low emission transformation by the end of 2025.
Under the overall goal of green and high-quality development of cement industry, ultra-low emission is gradually becoming the "standard" of cement enterprises, and enterprises that fail to meet the standards will face the risk of stopping production, limiting production or even withdrawing from the market, and environmental compliance will become the "admission ticket". Enterprises that do not meet the requirements of green development or are unable to promote their own environmental upgrading may be eliminated in this round of industry shuffling. How to choose the appropriate denitrification technology scheme for
cement enterprises?
Recently, Luo Xiangbo, chairman and general manager of Fujian yuanzhi Environmental Protection Technology Co., Ltd. (Hereinafter referred to as "yuanzhi Environmental Protection"), had a detailed exchange with China Cement Network on how cement enterprises can promote ultra-low emissions under the downward trend of the industry. Luo Xiangbo believes that "ultra-low emission is the goal that every cement enterprise must achieve, but in terms of technical scheme selection, enterprises need to consider according to their own situation". Luo Xiangbo (left)
, chairman and general manager of
Fujian yuanzhi Environmental Protection Technology Co., Ltd., said that after years of development, the domestic cement industry's ultra-low emission control technology scheme has been very mature, and for cement enterprises, the biggest difficulty lies in capital investment.
According to the current two mainstream SCR denitration schemes, each has its own advantages and disadvantages. The high temperature and low dust scheme has relatively high initial investment cost, low operation cost and high stability, and can cope with various working conditions such as collaborative disposal and ensure long-term stable operation; the high temperature and high dust scheme has relatively low investment cost, relatively high operation cost and general stability, and is suitable for production lines with relatively stable working conditions.
Luo Xiangbo believes that if the enterprise's own financial strength is limited, the working environment is stable, and it hopes to achieve ultra-low emissions to meet the requirements of environmental upgrading, then the high temperature and high dust technology scheme is a relatively appropriate choice; If the working environment of the enterprise is complex, involving co-disposal, alternative fuel use and other situations, and the enterprise has long-term development plans, then the high temperature and low dust technology scheme is undoubtedly the best choice.
"Apart from the high investment in the early stage, the other advantages are all advantages," Luo Xiangbo summed up the high temperature and low dust technology scheme with a smile.
As the leading enterprise of cement environmental protection management in China, yuanzhi Environmental Protection and Wuhan University of Technology jointly established the "yuanzhi-Wuhan University of Technology Energy Conservation and Environmental Protection Technology Research Center", through years of R & D investment, on the basis of digesting and absorbing SCR denitrification technology of cement in Europe and the United States, yuanzhi Environmental Protection and Wuhan University of Technology jointly established the "yuanzhi-Wuhan University of Technology Energy Conservation and Environmental Protection Technology Research Center". Combining its own patented technology in high temperature filtration and rich experience in SCR denitrification in other industries, it has developed a high temperature and low dust SCR dust and nitrate integration technology suitable for cement working conditions.
The data show that the "high temperature and low dust SCR denitrification integration technology" initiated by yuanzhi Environmental Protection combines the high temperature metal bag filter with the SCR denitrification device. The process route first dedusts and then denitrifies, which effectively solves the problems of uneven mixing of ammonia and nitrogen, excessive ammonia escape, catalyst wear, blockage and poisoning, and improves the operation stability of the back-end waste heat boiler, high-temperature fan and kiln tail bag, and reduces the operation and maintenance costs.
Dust removal process: use Xin Membrane ® metal filter bag to achieve surface filtration, reduce the dust concentration in the flue gas to less than 10 mg/m ³, with high efficiency and low resistance. Xinmei ® metal filter material is based on nanoscale and micron-scale metal powder, adopts asymmetric cascade structure design, has high filtration precision, easy dust removal, narrow pore size distribution, adjustable and controllable cascade holes, and creatively solves the effective matching of filter material resistance and precision.
Denitration process: the catalyst with high specific surface area is used, the amount of catalyst is reduced by nearly 70%, the resistance of catalyst layer is about 50 Pa, and there is no need to configure soot blower. The reason is that the clean flue gas after dust removal by the metal filter bag enters the catalyst, and there is no longer concern that the dust in the flue gas will block and wear the catalyst, so the catalyst with more pores and larger specific surface area can be selected, thus reducing the amount of catalyst by nearly 70% and extending its life to five years.
yuanzhi environmental protection high temperature and low dust SCR denitrification integrated technology has been successfully applied in the cement industry for more than five years, and has attracted more and more attention and recognition from users for its advantages of reliable and stable system operation and low operation and maintenance costs. Pictures of a cement project
in Henan and a cement project
in Guizhou Luo Xiangbo also said that cement enterprises need to make good use of policy tools to promote ultra-low emissions. According to reports, the central government's subsidies for ultra-low emission transformation are up to 50%, and some places also support discount loans, lowering the threshold of funds for ultra-low emission transformation of enterprises.
In the future, yuanzhi Environmental Protection will continue to promote technology iteration and embed energy-saving technology into the system, which will not only make the resistance lower and lower, the temperature drop less and less, the equipment volume smaller and smaller, but also explore more technology integration schemes
.
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