Flue gas catalytic oxidation denitration technique and catalyst thereof
A catalytic oxidation and catalyst technology, which is applied in the fields of coal combustion, flue gas catalytic oxidation and denitrification process and its catalyst, oil-fired boilers and industrial furnaces, to achieve the effect of low cost and high efficiency
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Embodiment 1
[0025] 1) Preparation of catalyst CoO by sol-gel method x / TiO 2
[0026] Using n-butyl titanate, ethanol, water, and acetic acid as raw materials, the volume ratio of each component is as follows, n-butyl titanate: ethanol: water: acetic acid = 1: 1.5: 0.5: 0.5, and the amount of cobalt nitrate added is Co : Ti (molar ratio) = 0.1, mixed, after the sol is transformed into a gel, dried, ground, and calcined at 500° C. to obtain a catalyst.
[0027] 2) Denitrification process
[0028] Treat flue gas O 2 Concentration 3%, GHSV (gas space velocity per hour) = 30000h -1 , the catalytic reactor is installed upstream of the dedusting device, the reaction temperature is 300°C, and the reactor outlet is NO 2 / (NO+NO 2 ) ratio of about 40%-60%, the oxidized flue gas enters the spray tower, and the SO 2 with NO x Remove together, the desulfurization efficiency is 90%, and the denitrification efficiency is 75%.
Embodiment 2
[0030] 1) Preparation of catalyst CoO by impregnation method x / TiO 2
[0031] Cobalt nitrate was added to commercial titanium dioxide slurry, stirred for 48 hours, dried at 100°C, calcined at 500°C for 2 hours, and ground to obtain a catalyst. The amount of cobalt added is Co:Ti (molar ratio)=0.05.
[0032] 2) Denitrification process
[0033] Treat flue gas O 2 Concentration 5%, GHSV (gas space velocity per hour) = 50000h -1 , the catalytic reactor is installed upstream of the dedusting device, the reaction temperature is 350°C, and the reactor outlet is NO2 / (NO+NO 2 ) ratio of about 40%-60%, the oxidized flue gas enters the packed tower, and the SO 2 with NO x Remove together, the desulfurization efficiency is 95%, and the denitrification efficiency is 80%.
Embodiment 3
[0035] 1) Preparation of catalyst CoO by sol-gel method x / ZrO 2 -TiO 2
[0036] Using n-butyl titanate, ethanol, water, and acetic acid as raw materials, the volume ratio of each component is as follows, n-butyl titanate: ethanol: water: acetic acid = 1: 1.65: 0.05: 0.07, and the amount of cobalt nitrate added is Co : Ti=0.05, the addition of zirconium nitrate is Zr:Ti (molar ratio)=0.1, mixed, after the sol is converted into gel, dried, ground, and roasted at 600°C to obtain the catalyst.
[0037] 2) Denitrification process
[0038] Treat flue gas O 2 Concentration 8%, GHSV (gas space velocity per hour) = 40000h -1 , the catalytic reactor is installed downstream of the dedusting device, the reaction temperature is 200°C, and the reactor outlet is NO 2 / (NO+NO 2 ) ratio of about 40%-60%, the oxidized flue gas enters the swirl plate tower, and the SO 2 with NO x Remove together, the desulfurization efficiency is 90%, and the denitrification efficiency is 85%.
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