With the increasing efforts of China's air management and the large coverage of flue gas treatment in the power industry, the non-electric industry has gradually become a key area of flue gas treatment. In 2018, Shandong Province released DB37/2375-2013-2018 "Shandong Province Local Industrial Kiln Air Pollutant Emission Standards" requires the emission concentration of NOx to meet the "Industrial Kiln Air Pollution Emission Standards": SO₂≤200mg/m³; NOx≤400mg/m³; particulate matter≤30mg/m³, and Local environmental protection department/EPA "2018 non-electric industry desulfurization denitrification dust removal ultra-low emission requirements" also has clear requirements for this.
Lime kiln flue gas treatment is bound to become a trend. The denitrification flue gas temperature of lime kiln furnace is generally 180℃～240℃, and the industrial tail gas dust of lime kiln contains a large amount of calcium and alkaline earth metals (CaO, K2O, Na2O), small dust particle size, high viscosity, and low tail gas denitrification temperature are special, which leads to the difficulty of NOx treatment.
The commonly used denitrification process of lime kiln mainly includes ozone oxidation, activated coke adsorption method and SCR denitrification process, which is widely used by lime kiln industry due to the maturity of SCR denitrification process and high efficiency of denitrification.
Basic reaction:
4NO+4NH3+O2→4N2+6H2O
2NO2+4NH3+O2→3N2+6H2O
Side reactions:
SO2+1/2O2→SO3
NH3+SO3+H2O→NH4HSO4
2NH3+SO3+H2O→(NH4)2SO4
Anhui Yuanchen Environmental Protection S&T Co., Ltd.(hereinafter referred to as "Yuanchen Technology"), based on years of experience in the industry, has developed a highly efficient alkali-resistant SCR denitrification catalyst for lime kiln, which can effectively improve the microscopic surface area of the catalyst and provide a reserve of active sites for the later coverage of poisoning. The core substance complexes macromolecules and produces a certain rejection effect on K and Na ions; the added active component-like components can effectively capture harmful ions.
Our high efficiency alkali resistant SCR denitrification catalyst for lime kiln has been successfully put into operation in 18 years in the lime kiln project of Shandong CITIC Calcium Industry Co., Ltd. and has achieved ultra-clean emission and has been used stably for more than 3 years. The current emission index is NOx concentration control within 50mg/Nm3, triple SO2/SO3 conversion rate is 0.88% and ammonia escape is 2.3ppm.
Yuanchen Technology is a high-tech enterprise integrating R&D, production and sales of dust filter bags and denitrification catalysts. The products dust filter bags and SCR denitrification catalysts have been widely used in many industries such as cement, steel, glass kilns, waste incineration power generation, biomass power generation, non-ferrous metal smelting, etc.!
