In the era of "double carbon" target, cement industry, as a traditional high energy-consuming industry, is standing at the key point of green transformation. The ultra-low emission transformation of nitrogen oxides has become a "hard bone" on the road of sustainable development of the industry. Solving this problem is not only related to the protection of the ecological environment, but also determines whether enterprises can seize the opportunity on the green development track.
Judging from the current situation, the ultra-low emission transformation of dust and sulfur dioxide is basically no problem, the difficulty lies in the ultra-low emission transformation of nitrogen oxides, cement enterprises need to carefully select their own denitrification technology route according to their own production line characteristics, geographical location, resource conditions and other factors, in order to ensure environmental protection standards at the same time. To maximize economic and social benefits.
In fact, Shijing Technology has made great achievements in the field of "SCR denitrification technology".
It is reported that Shijing Technology adopts high temperature and high dust SCR denitrification method, which has the characteristics of less equipment, easy layout, less system resistance, less air leakage, low maintenance and operation costs, and less investment, so it is favored by many cement enterprises. In the face of the difficulty of "catalyst blockage and poisoning risk in high temperature and high dust SCR denitrification", Shijing Science and Technology also has a "killer's mace". In terms of
catalysts, domestic professional suppliers are used, and the composition of raw materials exported from C1 is tested. More Reasonable and suitable catalyst is selected according to the influence of factors such as different raw meal compositions, flue gas temperature, SO2 , dust concentration of flue gas, alkali metals (and alkaline earth metals) in fly ash, heavy metals in fly ash, etc., and the catalyst mainly adopts 11/13 holes. Olves the problems of easy blockage, poisoning and failure of the traditional catalyst, optimizes the flow rate in the holes of the catalyst, and reduces the risks of dust accumulation, blockage and abrasion.
Shijing Technology also adopts a unique ash removal technology. Through the coupling of rake soot blower and sonic soot blower, the height of the soot blower nozzle is accurately designed to ensure the uniform and stable distribution of the flow field on the surface of the catalyst, so as to solve the problem of cement dust removal stably and reliably.
From the practical application of cement enterprises, we can also get a glimpse of the denitrification technology effect of Shijing Technology. The kiln tail flue gas SCR denitrification transformation project of Guangling Cement Co., Ltd. contracted by Shijing Science and Technology was put into operation in March 2022 and reached the production standard. The system runs steadily, and the NOx emission concentration at the outlet is less than 35mg/Nm3 . Ammonia escape at outlet < 3.5mg/Nm3 , pressure drop of SCR denitration system < 800Pa (actual operation 400-600Pa), temperature drop of SCR system < 8 ℃ (actual operation 4-6 ℃), Ammonia consumption of SNCR + SCR per ton of clinker ≤ 3.0 kg (actual operation ~ 2.68 kg/t. Cl), electricity consumption per ton of clinker ~ 1.15 kWh. The kiln inlet flue gas SCR denitration project
of Shuozhou Cement Co., Ltd. was put into operation in September 2023 and reached the production standard. The system runs stably, and the NOx emission concentration at the outlet is less than 35mg/Nm3 . Ammonia escape at outlet < 3.5mg/Nm3 , pressure drop of SCR denitration system < 800Pa (actual operation 350-600Pa), temperature drop of SCR system < 8 ℃ (actual operation 3-5 ℃), Ammonia consumption of SNCR + SCR per ton of clinker ≤ 3.0 kg (actual operation ~ 2.03 kg/t. Cl), electricity consumption per ton of clinker ~ 1.09 kWh. The SCR denitrification technology
of Shijing Science and Technology has set a benchmark for the green emission reduction of cement industry. It not only successfully solves the technical problems of nitrogen oxide treatment, but also promotes the cement industry to make great strides towards eco-friendly direction through green technology innovation!
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