At present, under the background of comprehensively promoting the construction of ecological civilization, green development has become the only way for the cement industry to achieve industrial upgrading. In recent years, the requirement of air pollutant emission control in cement industry has been continuously increased, and ultra-low emission is expected to gradually become the standard of domestic cement enterprises. Nitrogen oxides are undoubtedly the most difficult in the treatment of the three major pollutants (dust, nitrogen oxides, sulfur dioxide) in the
cement industry, and it is particularly critical to find a scientific and reasonable way to control them.
"At present, there are many ways to control the ultra-low emission of nitrogen oxides in cement plants. From the front-end emission reduction to the back-end treatment, each technical scheme has its own advantages. However, in order to meet the ultra-low emission of nitrogen oxides, it is necessary to ensure that ammonia escape is less than 8 mg/& nbsp;." Below Nm ³, SCR is still the first choice, said Chen Wangzhu, deputy general manager of Fujian yuanzhi Environmental Protection Technology Co., Ltd. Chen Wangzhu
, deputy general manager of
Fujian yuanzhi Environmental Protection Technology Co., Ltd., said that the biggest difficulty in the application of high temperature SCR in the cement industry lies in the dust control in high temperature environment. "The optimal performance of the catalyst requires a suitable reaction temperature and the use of low dust, but in the cement production line, the area that meets the temperature conditions also faces the problem of excessive dust, which can easily cause the blockage, wear and poisoning of the catalyst. Therefore, how to solve the problem of high temperature and high concentration of dust has always been the core contradiction in the promotion and application of SCR," Chen Wangzhu said.
For this reason, Fujian yuanzhi Environmental Protection Technology Co., Ltd. has developed a high temperature and low dust SCR dust and nitrate integration technology suitable for cement working conditions through years of R & D investment, combined with its own patented technology in high temperature filtration and rich experience in SCR denitrification in other industries, which skillfully utilizes the uniform distribution of equipment space and process. Realizes the structural innovation of integrated continuous removal of dust and nitrate, effectively solves the problems of uneven mixing of ammonia and nitrogen, excessive escape of ammonia, serious ash deposition in a flue, uneven flow rate of flue gas in a catalyst layer, and serious blockage, poisoning and abrasion of a catalyst, and realizes efficient treatment of flue gas. In an interview
with China Cement Network,
Chen Wangzhu said, "This technology has the advantages of high temperature and high dust, high temperature medium dust and medium temperature medium dust. The catalyst operates in the state of dust, and only one layer of catalyst is set up, which can effectively reduce the amount of catalyst and avoid the problems of catalyst blockage, wear and poisoning." Extend the service life of the catalyst, thereby reducing the cost of nitrogen oxide treatment in enterprises.
The data show that "Fujian yuanzhi High Temperature and Low Dust SCR Dust and Nitrate Integrated Technology" leads out high temperature and high dust flue gas from C1 outlet through mechanical dust removal and high temperature metal filter bag for secondary dust collection, which reduces the dust content in flue gas to less than 10 mg/Nm ³. The low-dust/micro-dust flue gas flows through the SCR catalyst layer arranged on the top of the filter bag clean air chamber from bottom to top (only one layer of catalyst is arranged) to realize NOx below 50mg/m ³, which effectively solves the problems of uneven mixing of ammonia and nitrogen, excessive ammonia escape, serious ash deposition in the flue, uneven flue gas flow rate of the catalyst layer, catalyst blockage, poisoning and serious abrasion, etc. And that efficient treatment of the flue gas is realize.
Generally speaking, "Fujian yuanzhi High Temperature and Low Dust SCR Dust and Nitrate Integration Technology" has matured in the technical level, obtained the certificate of scientific and technological achievements appraisal in 2020, passed the ministerial certification of the Ministry of Ecology and Environment of the People's Republic of China, and won the second prize of science and technology in the building materials machinery industry in 2021.
According to Chen Wangzhu, Fujian yuanzhi High Temperature and Low Dust SCR Dust and Nitrate Integrated Technology has been put into operation in Dengdian Group Cement Co., Ltd., Huarun Cement (Changzhi) Co., Ltd. and Shanxi Taoyuan Dongyi Cement Co., Ltd. The successful application of this technology will play an important demonstration role in the deep emission reduction of NOx in the national cement industry.
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