Process performance and chemical composition of the four performance indicators of denitration catalysts
Publishdate：2020-11-09 Views：14
Most denitrification catalysts used in SCR use TiO2 as a carrier and V2O5, V2O5 WO3, or V2O5 MoO3 as the active ingredient. The common forms are honeycomb, plate-shaped, or corrugated.
Differences in structure, active ingredients, raw materials, and other aspects can lead to different catalytic performance of catalysts. So, how to determine the proportion of raw materials for denitration catalysts to improve catalytic performance? Firstly, let's understand the important indicators of catalysts.
Process performance indicators
Denitration efficiency
Before using catalysts, the denitrification efficiency is usually designed based on the actual needs and production characteristics of the denitrification reaction, and suitable denitrification catalysts are found to ensure that the catalytic efficiency and denitrification efficiency can achieve the expected goals.
SO2/SO3 conversion rate
The proportion of SO2 converted to SO3 in flue gas has a significant impact on the entire catalytic reaction. The higher the conversion rate, the better the catalytic effect, and the corresponding reduction in the number of invested catalysts. Meanwhile, by analyzing the conversion rates of SO2 and SO3, the use of catalysts and their specific efficiency can be mastered.
NH3 escape rate
The volume fraction of NH3 in the outlet flue gas reflects the NH3 that did not participate in the reaction. By analyzing the escape rate of NH3, the process and efficiency of catalytic reactions can be grasped. If the removal rate of NH3 is too high, it will increase production costs. Therefore, the correct analysis of NH3 escape rate directly affects the analysis of catalytic reaction efficiency and the satisfaction of reaction requirements.
Pressure drop
In catalytic reactions, the pressure drop of the denitrification system is composed of the pressure drop of the catalyst, the pressure drop of the reactor, and the flue. The smaller the pressure drop, the more complete the catalytic reaction. The analysis of pressure drop can grasp the reaction rate, effect, and specific conditions of catalysts, which is of great significance for improving the quality of catalytic reactions and meeting the needs of catalytic reactions.
Chemical composition content
For the chemical composition of catalysts, it mainly refers to the chemical composition of active ingredients and supported catalysts. Mastering the chemical composition content of catalysts and analyzing the proportion of various chemical components in catalysts plays an important role in improving the reaction rate and exerting the catalytic effect of catalysts.
1. Carrier composition: TiO2 (>80%)
2. Main active ingredient: V2O5 (approximately 1%)
3. MoO3: Improve the activity of the low-temperature part, while suppressing the oxidation rate, improving thermal stability, and preventing a decrease in specific surface area due to sintering;
4. Other components: SO42-, inorganic substances other than titanium
5. Structural components: glass fiber, etc. (enhanced mechanical strength), polyethylene oxide, etc. (adhesive)
Most denitrification catalysts used in SCR use TiO2 as a carrier and V2O5, V2O5 WO3, or V2O5 MoO3 as the active ingredient. The common forms are honeycomb, plate-shaped, or corrugated.
Differences in structure, active ingredients, raw materials, and other aspects can lead to different catalytic performance of catalysts. So, how to determine the proportion of raw materials for denitration catalysts to improve catalytic performance? Firstly, let's understand the important indicators of catalysts.
Process performance indicators
Denitration efficiency
Before using catalysts, the denitrification efficiency is usually designed based on the actual needs and production characteristics of the denitrification reaction, and suitable denitrification catalysts are found to ensure that the catalytic efficiency and denitrification efficiency can achieve the expected goals.
SO2/SO3 conversion rate
The proportion of SO2 converted to SO3 in flue gas has a significant impact on the entire catalytic reaction. The higher the conversion rate, the better the catalytic effect, and the corresponding reduction in the number of invested catalysts. Meanwhile, by analyzing the conversion rates of SO2 and SO3, the use of catalysts and their specific efficiency can be mastered.
NH3 escape rate
The volume fraction of NH3 in the outlet flue gas reflects the NH3 that did not participate in the reaction. By analyzing the escape rate of NH3, the process and efficiency of catalytic reactions can be grasped. If the removal rate of NH3 is too high, it will increase production costs. Therefore, the correct analysis of NH3 escape rate directly affects the analysis of catalytic reaction efficiency and the satisfaction of reaction requirements.
Pressure drop
In catalytic reactions, the pressure drop of the denitrification system is composed of the pressure drop of the catalyst, the pressure drop of the reactor, and the flue. The smaller the pressure drop, the more complete the catalytic reaction. The analysis of pressure drop can grasp the reaction rate, effect, and specific conditions of catalysts, which is of great significance for improving the quality of catalytic reactions and meeting the needs of catalytic reactions.
Chemical composition content
For the chemical composition of catalysts, it mainly refers to the chemical composition of active ingredients and supported catalysts. Mastering the chemical composition content of catalysts and analyzing the proportion of various chemical components in catalysts plays an important role in improving the reaction rate and exerting the catalytic effect of catalysts.
1. Carrier composition: TiO2 (>80%)
2. Main active ingredient: V2O5 (approximately 1%)
3. MoO3: Improve the activity of the low-temperature part, while suppressing the oxidation rate, improving thermal stability, and preventing a decrease in specific surface area due to sintering;
4. Other components: SO42-, inorganic substances other than titanium
5. Structural components: glass fiber, etc. (enhanced mechanical strength), polyethylene oxide, etc. (adhesive)
